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LT3482 90V Boost DC/DC Converter with APD Current Monitor FEATURES

DESCRIPTIO
High Output Voltage: Up to 90V Integrated Schottky Diodes 48V, 280mA Internal Switch High Side APD Current Monitor Adjustable Switching Frequency: 650kHz or 1.1MHz Wide VIN Range: 2.5V to 16V Surface Mount Components Low Shutdown Current: <1A Soft-Start Internal Compensation CTRL Pin Allows Output Adjustment with No Polarity Inversion 3mm x 3mm 16-Lead QFN Package
APPLICATIO S

APD Bias PIN Diode Bias Optical Receivers and Modules Fiber Optic Network Equipment
The LT(R)3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 features high side APD current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated power switch, Schottky diodes and APD current monitor allow a small converter footprint and low solution cost. Constant switching frequency results in predictable output noise that is easy to filter. The inductor-based topology ensures an input free from switching noise. An integrated high side current monitor produces a current proportional to APD current with better than 10% relative accuracy over four decades of dynamic range in the input range of 250nA to 2.5mA. This current can be used as a reference to provide a digitally programmed output voltage via the CTRL pin. The LT3482 is available in the tiny footprint (3mm x 3mm) 16-lead QFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
VIN 5V 1F 10H 0.1F
Output Voltage Ripple
SW VIN fSET PUMP MONIN LT3482 VOUT2 0.47F CTRL GND MON APD 10k VOUT1 FB 85V AT 2.5mA 0.1F
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OFF ON
SHDN
0.1F 0.47F
1M
VAPD RIPPLE 100mV/DIV
14k
10nF
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500ns/DIV
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LT3482 ABSOLUTE
(Note 1)
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RATI GS
Input Voltage (VIN) ....................................................16V VOUT1, SW Voltage ....................................................48V VOUT2, PUMP, MONIN, APD Voltage..........................90V FB Voltage ...................................................................5V SHDN, fSET, CTRL Voltage .........................................16V MON Voltage .............................................................12V Operating Temperature Range (Note 2).................................................... -40C to 85C Maximum Junction Temperature .......................... 125C Storage Temperature Range................... -65C to 125C
16 15 14 13 NC 1 APD 2 MONIN 3 VOUT2 4 5 VOUT1 6 PUMP 7 SW 8 SW 17 12 SHDN 11 VIN 10 GND 9 GND
UD PACKAGE 16-LEAD (3mm x 3mm) PLASTIC QFN TJMAX = 125C, JA = 68C/W, JC = 4.2C/W EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH LT3482EUD#PBF LT3482IUD#PBF TAPE AND REEL LT3482EUD#TRPBF LT3482IUD#TRPBF PART MARKING* LCFG LCFG PACKAGE DESCRIPTION 16-Lead (3mm x 3mm) Plastic QFN 16-Lead (3mm x 3mm) Plastic QFN TEMPERATURE RANGE 0C to 85C -40C to 125C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free parts, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER Minimum Operating Voltage Maximum Operating Voltage Feedback Voltage Feedback Line Regulation FB Pin Bias Current Supply Current Switching Frequency Maximum Duty Cycle Switch Current Limit Switch VCESAT Switch Leakage Current Schottky Forward Voltage Schottky Reverse Leakage SHDN Voltage High
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 3V, VSHDN = 3V unless otherwise noted.
CONDITIONS MIN 2.5 16 CTRL = 1.5V

CTRL
MON
fSET
FB
FB = 1.3V, Not Switching VSHDN = 0 fSET = 0V fSET = 2V fSET = 0V ISW = 150mA SW = 5V ISCHOTTKY = 150mA VOUT1 - SW = 50V 1.5 580 1.0 95 280
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PIN CONFIGURATION
TOP VIEW
TYP
MAX
UNITS V V V V %/V nA mA A kHz MHz % mA mV A mV A V
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1.215 1.200
1.235 0.025 30 3.3 0.1 650 1.1 360 130 880
1.255 1.260 0.07 100 4.0 0.5 750 1.3 420 220 2 5
LT3482 ELECTRICAL CHARACTERISTICS
PARAMETER SHDN Voltage Low SHDN Pin Bias Current fSET Voltage High fSET Voltage Low fSET Bias Current CTRL to FB Offset APD Current Monitor Gain Monitor Output Voltage Clamp APD Monitor Voltage Drop MONIN Pin Current Limit MONIN - APD at IAPD = 1mA, MONIN = 90V APD = 0V, MONIN = 40V 15 fSET = 2V CTRL = 0.5V IAPD = 250nA, 10V MONIN 90V IAPD = 2.5mA, 20V MONIN 90V

The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 3V, VSHDN = 3V unless otherwise noted.
CONDITIONS MIN TYP 35 1.5 0.4 22 -5 -10 0.180 0.185 2 2 0.20 0.20 11.5 5 40 10 15 0.215 0.215 V V mA MAX 0.4 50 UNITS V A V V A mV mV
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The LT3482E is guaranteed to meet specified performance from 0C to 85C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LT3482I is guaranteed to meet performance specifications over the -40C to 125C operating temperature range.
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LT3482 TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25C unless otherwise specified)
Oscillator Frequency vs Temperature
1200 1100 fSET = 2V FREQUENCY (kHz) 1000 900 800 700 600 500 -50 -25 400 350 SWITCH CURRENT LIMIT (mA) SWITCH CURRENT LIMIT (mA) 300 250 200 150 100 50 50 25 75 0 TEMPERATURE (C) 100 125 0 0 20 60 DUTY CYCLE (%) 40 80 100
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fSET = 0V
Current Monitor Output vs MONIN
22 IAPD = 100A 1.0E-02 1.0E-03 21 IMON (A) IMON (A) 1.0E-04 1.0E-05 1.0E-06 1.0E-07 1.0E-08 18 10 20 30 40 50 60 MONIN (V) 70 80 90
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ERROR (%)
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Current Monitor Voltage Drop vs Reference Current
7 6 5 4 3 2 1 0 1.00E-07 VCESAT (mV) 300 250
FB PIN VOLTAGE (V)
MONIN - APD (V)
1.00E-05 1.00E-03 REFERENCE CURRENT (A)
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UW
3482 G01 3482 G04
Switch Current Limit vs Duty Cycle
360 340 320 300 280 260 240 220
Switch Current Limit vs Temperature
200 -50 -25
0
50 75 25 TEMPERATURE (C)
100
125
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APD Current Monitor Accuracy
MONIN = 90V 2
APD Current Monitor Accuracy vs Temperature
MONIN = 90V 0 -2 -4 -6 -8 -10 -50 -25 IAPD = 2.5mA IAPD = 10A IAPD = 250nA 50 25 75 0 TEMPERATURE (C) 100 125
1.0E-09 1.0E-08
1.0E-06 1.0E-04 IAPD (A)
1.0E-02
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Switch Saturation Voltage (VCESAT)
1.25
FB Pin Voltage vs Temperature
200 150 100 50 0 0 50 100 150 200 250 300 SWITCH CURRENT (mA) 350
1.24
VIN = 16V
VIN = 3V 1.23
1.22 -50 -25
50 25 75 0 TEMPERATURE (C)
100
125
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LT3482 PI FU CTIO S
APD (Pin 2): Connect APD cathode to this pin. MONIN (Pin 3): Current Monitor Power Supply Pin. An external lowpass filter can be included here to further reduce supply voltage ripple. VOUT2 (Pin 4): Voltage Doubler Output Pin. Put a 50V rated capacitor between this pin and VOUT1. Tie a resistor divider to the FB pin and GND. VOUT1 (Pin 5): Boost Output Pin. Put a capacitor between this pin and the GND plane. Minimize the length of the trace to the capacitor. PUMP (Pin 6): Charge Pump Pin. Put a 50V rating bypass capacitor between SW and PUMP to form a complete voltage doubler with the internal integrated Schottky diodes. Minimize trace length to the capacitor. SW (Pins 7, 8): Switch Pin. Minimize the trace length on this pin to reduce EMI. GND (Pins 9, 10): Ground. Pins connected internally. For best performance, connect both pins to board ground. VIN (Pin 11): Input Supply Pin. This pin must be locally bypassed. SHDN (Pin 12): Shutdown Pin. Tie to 1.5V or higher to enable device; 0.4V or less to disable device. This pin also functions as soft-start between 1.5V and 2V. CTRL (Pin 13): Internal Reference Override Pin. This allows the FB voltage to be externally set between 0V and 1.2V. Tie this pin higher than 1.5V to use the internal reference of 1.235V. FB (Pin 14): Feedback Pin. Connect the output resistor divider tap here. fSET (Pin 15): Oscillator Frequency Selection Pin. Tie this pin to above 1.5V or higher to select the higher switching frequency of 1.1MHz. For lower switching frequency, tie to GND. MON (Pin 16): Current Monitor Output Pin. It sources a current equal to 20% of the APD current and converts to a reference voltage through an external resistor. Exposed Pad (Pin 17): GND. This pin must be soldered to the PCB.
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LT3482 FU CTIO AL DIAGRA W
L1 VIN 11 VIN 9 GND D1 10 GND 7 SW 8 SW 6 PUMP D3 D2 VOUT2 VOUT1 CFLY 4 C2 5 C1 1.235V REFERENCE R2 R1 FB CPL MONIN A1 RC CC DRIVER A2 RSQ Q1 APD CURRENT MIRROR APD 3
-
VIN RS 12 SHDN CS 13 CTRL 14 FB RAMP GENERATOR CURRENT SENSE AMPLIFIER
650kHz/1.1MHz OSCILLATOR 15 fSET 16 MON
CONTROL BLOCK R3 C4
OPERATIO
The LT3842 boost converter uses a constant frequency current mode control scheme to provide excellent line and load regulation. Operation can be best understood by referring to the Functional Diagram. At the start of each oscillator cycle, the SR latch is set, which turns on the power switch, Q1. A voltage proportional to the switch current is added to a stabilizing ramp and the resulting sum is fed into the positive terminal of the PWM comparator, A2. When this voltage exceeds the level at the negative input of A2, the SR latch is reset turning off the power switch. The level at the negative input of A2 is set by the error amplifier A1, and is simply an amplified version of the difference between the feedback voltage and the reference voltage of 1.235V, or externally provided CTRL voltage. In this manner, the error amplifier sets the correct peak
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+
EAMP
-
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+ + -
PWM COMPARATOR
+
2 C3
NC 1
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current level to keep the output in regulation. If the error amplifier's output increases, more current is delivered to the output; if it decreases, less current is delivered. The LT3482 has an integrated high side APD current monitor with a 5:1 ratio. The MONIN pin can accept a supply voltage up to 90V, which is suitable for APD photodiode applications. The MON pin has an open-circuit protection feature and is internally clamped to 11.5V. If an APD is tied to the APD pin, the current will be mirrored to the MON pin and converted to a voltage signal by the resistor R3. This voltage signal can be used to drive an external control block to adjust the APD voltage by adjusting the feedback threshold of EAMP A1 through the CTRL input.
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LT3482 APPLICATIO S I FOR ATIO
Switching Frequency The LT3482 can operate at either 650kHz nominal or 1.1MHz nominal; the voltage at the fSET pin selects which frequency is used. At 1.1MHz, a physically smaller inductor and capacitor can be used in a given application, but higher frequencies will slightly decrease efficiency and maximum duty cycle. Generally if efficiency and maximum duty cycle are crucial, the lower switching frequency should be selected by connecting fSET to GND. If application size and cost are more important, connect fSET to VIN to select the higher switching frequency. Inrush Current The LT3482 has built-in Schottky diodes for the boost and charge pump. When supply voltage is applied to the VIN pin, the voltage difference between VIN and VOUT1 generates inrush current flowing from input through the inductor and the Schottky diode (D1 in the Functional Diagram) to charge the output capacitor. The selection of inductor and capacitor value should ensure the peak of the inrush current to be below 1A. In addition, the LT3482 turn-on should be delayed until the inrush current is less than the maximum current limit. The peak inrush current can be estimated as follows: V - 0.6 * exp - IP = IN L 2 L - 1 -1 C C where L is the inductance and C is the output capacitance. Table 1 gives inrush peak currents for some component selections.
VOUT2 LT3482 13 CTRL FB 14 R2
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Figure 1. Output Voltage Feedback Connection
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Table 1. Inrush Peak Current
VIN (V) 5 5 L (H) 10 22 C (F) 1 1 IP (A) 0.87 0.68
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Setting Output Voltage The LT3482 is equipped with both an internal 1.235V reference and an auxiliary reference input (the CTRL pin). This allows users to select between using the built-in reference and supplying an external reference voltage. The voltage at the CTRL pin can be adjusted while the chip is operating to alter the output voltage of LT3482 for purposes such as APD's bias voltage adjustment. To use the internal 1.235V reference, the CTRL pin should be held higher than 1.5V, which can be done by tying it to VIN. When the CTRL pin is between 0V and 1.2V, the LT3482 will regulate the output such that the FB pin voltage is equal to the CTRL pin voltage. To set the output voltage, select the values of R1 and R2 (see Figure 1) according to the following equation:
V R1= R2 OUT2 - 1 VREF
where VREF = 1.235V if the internal reference is used or VREF = CTRL if CTRL is between 0V and 1.2V. R2 can be selected to load the output to maintain a constant switching frequency when the APD load is very low. Preventing entry into pulse skipping mode is an important consideration for post filtering the regulator output.
4 R1
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LT3482 APPLICATIO S I FOR ATIO
Inductor Selection The inductors used with the LT3482 should have a saturation current rating of 0.3A or greater. If the device is used in an application where the input supply will be hot-plugged, the saturation current rating should be equal to or greater than the peak inrush current. For best loop stability, the inductor value selected should provide a ripple current of 60mA or more. For a given VIN and VOUT1, the inductor value to use in continuous conduction mode (CCM) is estimated by the formula: D * VIN L= * 60mA where: D= VOUT1 + 1- VIN VOUT1 + 1
and f is the switching frequency. To achieve low output voltage ripple, a small value inductor should be selected to force the LT3482 work in discontinuous conduction mode (DCM). The inequality is true when the LT3482 is operating in discontinuous condition mode. L< D * VIN * ILIMIT
where ILIMIT is the switch current limit. Operating in DCM reduces the maximum load current and the conversion efficiency. Capacitor Selection Low ESR capacitors should be used at the output to minimize the output voltage ripple. Use only X5R and X7R types because they retain their capacitance over wider voltage and temperature ranges than other types. High output voltages typically require less capacitance for loop stability. For applications with out voltage less than 45V, intermediate output pin VOUT1 can directly serve as the output pin. Typically use a 2F capacitor for output voltage less than 25V and 1F capacitor for output voltage between 25V and 45V. When output voltage goes beyond 45V, a charge pump must be formed with cascaded 0.47F
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capacitors C1 and C2 at the output nodes. A typical 0.1F capacitor is used as the flying capacitor CFLY to form the charge pump. Always use a capacitor with sufficient voltage rating. Either ceramic or solid tantalum capacitors may be used for the input decoupling capacitor, which should be placed as close as possible to the LT3482. A 1F capacitor is sufficient for most applications. Phase Lead Capacitor A small value capacitor (i.e., 10pF to 22pF) can be added in parallel with the resistor between the output and the FB pin to reduce output perturbation due to a load step and to improve transient response. This phase lead capacitor introduces a pole-zero pair to the feedback that boosts phase margin near the crossover frequency. The APD is very sensitive to a noisy bias supply. To lowpass filter noise from the internal reference and error amplifier, a 0.1F phase lead capacitor can be used. The corner frequency of the noise filter is R1 * CPL. APD Current Monitor The power supply switching noise associated with a switching power supply can interfere with the photodiode DC measurement. To suppress this noise, a 0.1F capacitor is recommended at APD pin. An additional output lowpass filter, a 10k resistor and a 10nF capacitor in parallel at MON pin, can further reduce the power supply noise and other wide band noise, which might limit the measurement accuracy of low level signals. For applications requiring fast current monitor response time, a RC lowpass filter at MONIN pin is used to replace the 0.1F capacitor at APD pin, as illustrated in Figure 2.
RMON MONIN LT3482 VOUT2 C2 VOUT1 APD
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CMON
C1
Figure 2
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LT3482 APPLICATIO S I FOR ATIO
In some applications, a long cable or wire is used to connect the LT3482 to APD. When APD is shorted to GND, APD pin voltage might ring below ground and damage the internal circuitry. To prevent damage during short-circuit event, a 20 resistor must be added in series with the APD.
MON fSET
R2 R1 16 CPL 1 APD 2 17 3 CMON (OPT) RMON (OPT) 4 10 9 L1 12 11 CIN 15 14 13
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Layout Hints The high speed operation of the LT3842 demands careful attention to board layout. You will not get advertised performance with careless layout. Figure 3 shows the recommended component placement.
CTRL VIN GND 5 C2 6 7 CFLY 8 C1
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Figure 3. Suggested Layout
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LT3482 TYPICAL APPLICATIO S
5V to 85V APD Bias Power Supply
L1 10H C2 0.1F 60 50 EFFICIENCY (%) C1 1F SW VIN fSET OFF ON SHDN CTRL GND MON C7 10nF R3 10k APD LT3482 VOUT2 VOUT1 FB 85V AT 2.5mA C3 0.1F C4 0.47F C5 0.47F PUMP MONIN 40 30 20 10 R2 14k 0 0
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VIN 5V
C1: MURATA X7R GRM21BR71C105KA01B C2: AVX 06035C104KAT2A C3, C6: AVX 08051C104KAT2A C4, C5: MURATA X7R GRM31MR71H474KA01B C7: MURATA GRM2167U1H103JA01B L1: COILCRAFT ME3220-103KL OR EQUIVALENT
3.3V to 70V APD Bias Power Supply with Fast Current Monitor Response
L1 6.8H C2 0.1F 60 50 C1 1F SW VIN fSET OFF ON SHDN CTRL GND MON R4 10k APD 70V AT 2mA
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VIN 3.3V
LT3482 VOUT2 VOUT1 FB C4 0.47F C5 0.47F
R1 100 C6 0.1F R2 1M C3 0.1F
EFFICIENCY (%)
PUMP MONIN
C1: MURATA X7R GRM21BR71C105KA01B C2: AVX 06035C104KAT2A C3, C6: AVX 08051C104KAT2A C4, C5: MURATA X7R GRM31MR71H474KA01B L1: COILCRAFT ME3220-682ML OR EQUIVALENT
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Efficiency
C6 0.1F
R1 1M
0.5
1
2 1.5 2.5 IMONIN (mA)
3
3.5
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Efficiency
40 30 20 10
R3 16.5k
0 0 0.5 1 1.5 IMONIN (mA) 2 2.5
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APD Input Load for Current Monitor Step Response Measurement
2 APD 10k NODE A 5V 0V 2mA 0mA REF GND VMON 2V/DIV REF GND VNODE A 20V/DIV
Current Monitor Step Response
2k
500ns/DIV
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LT3482 PACKAGE DESCRIPTIO U
UD Package 16-Lead Plastic QFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1691)
0.70 0.05 PACKAGE OUTLINE 0.25 0.05 0.50 BSC RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.75 0.05 BOTTOM VIEW--EXPOSED PAD R = 0.115 TYP 15 16 0.40 0.10 1 1.45 0.10 (4-SIDES) 2 PIN 1 NOTCH R = 0.20 TYP OR 0.25 x 45 CHAMFER
(UD16) QFN 0904
3.50 0.05 1.45 0.05 2.10 0.05 (4 SIDES)
3.00 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6)
0.200 REF 0.00 - 0.05 NOTE: 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
0.25 0.05 0.50 BSC
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LT3482 TYPICAL APPLICATIO
VIN 3.3V C1 1mF L1 5.6mH
3.3V to 40V APD Bias Power Supply
70 60 SW VIN fSET OFF ON SHDN CTRL GND MON R4 10k APD 40V AT 3mA
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LT3482 VOUT2 VOUT1 FB C2 1mF C3 0.1mF
R3 100W R1 1M C4 0.1mF
EFFICIENCY (%)
PUMP MONIN
C1: MURATA X7R GRM21BR71C105KA01B C2: MURATA X7R GRM31MR71H105KA88B C3, C4: AVX 06035C104KAT2A L1: COILCRAFT ME3220-562ML OR EQUIVALENT
RELATED PARTS
PART NUMBER LT1930/LT1930A LT3460 LT3461/LT3461A LT3465/LT3465A DESCRIPTION 1A (ISW), 1.2MHz/2.2MHz High Efficiency Step-Up DC/DC Converters 0.3A (ISW), 1.3MHz High Efficiency Step-Up DC/DC Converter 0.3A (ISW), 1.3MHz/3MHz High Efficiency Step-Up DC/DC Converters with Integrated Schottky Constant Current, 1.2MHz/2.7MHz High Efficiency White LED Boost Regulator with Integrated Schottky COMMENTS VIN: 2.6V to 16V, VOUT(MAX) = 34V, IQ = 4.2mA/5.5mA, ISD < 1A, ThinSOTTM Package VIN: 2.5V to 16V, VOUT(MAX) = 38V, IQ = 2mA, ISD < 1A, ThinSOT Package VIN: 2.5V to 16V, VOUT(MAX) = 38V, IQ = 2.8mA, ISD < 1A, SC70 and ThinSOT Package VIN: 2.7V to 16V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD < 1A, ThinSOT Package
ThinSOT is a trademark on Linear Technology Corporation.
12 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2006
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Efficiency
50 40 30 20 10 0 0 0.5 1 1.5 2 2.5 3 3.5 4 IMONIN (mA)
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R2 28k
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