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MIC5319
Micrel
MIC5319
500mA Cap Ultra-Low Dropout, High PSRR LDO Regulator
General Description
The MIC5319 is a high-performance, 500mA LDO regulator, offering extremely high PSRR and very low noise while consuming low ground current. Ideal for battery-operated applications, the MIC5319 features 1% accuracy, extremely low-dropout voltage (200mV @ 500mA), and low ground current at light load (typically 90A). Equipped with a logic-compatible enable pin, the MIC5319 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5319 is a Cap design operating with very small ceramic output capacitors for stability, thereby reducing required board space and component cost. The MIC5319 is available in fixed-output voltages and adjustable output voltages in the super-compact 2mm x 2mm MLFTM leadless package and thin SOT-23-5 package. Additional voltage options are available. Contact Micrel marketing. All support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * Ultra-low dropout voltage 200mV @ 500mA Input voltage range: 2.5 to 5.5V Stable with ceramic output capacitor Low output noise -- 40Vrms Low quiescent current of 90A total High PSRR, up to 70dB @1kHz Fast turn-on-time -- 40s typical High output accuracy: * 1.0% initial accuracy * 2.0% over temperature Thermal shutdown protection Current-limit protection Logic-controlled Enable Tiny 2mm x 2mm MLFTM package, 500mA continuous Thin SOT-23-5 package, 500mA peak Cellular phones PDAs Fiber optic modules Portable electronics Notebook PCs Audio Codec power supplies
* * * * * * * * * * *
Applications
Typical Application
DROPOUT VOLTAGE (mV)
200 180 160 140 120 100 80 60 40 20 0 0 100 200 Vout = 2.8V Cout = 2.2uF 300 400 500
Dropout Voltage
MIC5319
VIN 1F
VIN VOUT EN BYP GND 0.1F
2.8V@500mA VOUT 2.2F
OUTPUT CURRENT (mA)
100 90 80 70
PSRR (Bypass Pin Cap = 0.1F)
50mA 100A
PSRR (dB)
60 50 40 30 20 10 0 10 500mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF 1k 100 10k 100k FREQUENCY (Hz) 1M
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
Micrel, Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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Ordering Information
Part Number MIC5319-2.8BD5 MIC5319-2.8BML MIC5319BML MIC5319-2.8YD5 MIC5319-2.8YML MIC5319YML
Note: 1. For other output voltage options, contact Micrel marketing.
Marking N928 928 9AA N928 928 9AA
Voltage 2.8 2.8 ADJ 2.8 2.8 ADJ
Junction Temp. Range(1) -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package Thin SOT23-5 6-pin 2x2 MLFTM 6-pin 2x2 MLFTM Thin SOT23-5 Pb-Free 6-pin 2x2 MLFTM Pb-Free 6-pin 2x2 MLFTM Pb-Free
Pin Configuration
EN 1 GND 2 VIN 3 6 BYP 5 NC 4 VOUT
EN 1 GND 2 VIN 3
6 BYP 5 ADJ 4 VOUT
MIC5319-x.xBML 6-Pin 2mm x 2mm MLFTM (ML) (Top View)
EN GND VIN
3 2 1
MIC5319BML (Adjustable) 6-Pin 2mm x 2mm MLFTM (ML) (Top View)
KWxx
4 5
BYP
VOUT
MIC5319-x.xBD5 TSOT-23-5 (D5) (Top View)
Pin Description
Pin Number MLF-6 Fixed 1 2 3 4 - 5 6 HS Pad Pin Number MLF-6 Adj. 1 2 3 4 5 - 6 HS Pad Pin Number Pin Name TSOT-23-5 Fixed 3 2 1 5 - 4 - EN GND VIN VOUT ADJ NC BYP EPAD Pin Function Enable Input. Active High. High = on, low = off. Do not leave floating. Ground. Supply Input. Output voltage. Adjust Input: Connect to external resistor voltage divider network. No connection for fixed voltage parts. Reference Bypass: Connect external 0.1F to GND for reduced output noise. May be left open. Exposed Heatsink Pad connected to ground internally.
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Absolute Maximum Ratings(1)
Supply Input Voltage (VIN) .................................... 0V to 6V Enable Input Voltage (VEN) ................................... 0V to 6V Power Dissipation (PD) ........................ Internally Limited(3) Junction Temperature(TJ) ........................ -40C to +125C Storage Temperature (TS) ......................... -65C to 150C Lead Temperature (soldering, 5 sec.) ....................... 260C ESD(4) .............................................................................................. 3kV
Operating Ratings(2)
Supply Input Voltage (VIN) .............................. 2.5V to 5.5V Enable Input Voltage (VEN) .................................. 0V to VIN Junction Temperature (TJ) ....................... -40C to +125C Package Thermal Resistance MLFTM (JA) ......................................................... 93C/W TSOT-23 (JA) ................................................... 235C/W
Electrical Characteristics(5)
VIN = VOUT +1.0V; COUT = 2.2F, IOUT = 100A; TJ = 25C, bold values indicate -40C to + 125C; unless noted. Parameter Output Voltage Accuracy Condition Variation from nominal VOUT Variation from nominal VOUT, IOUT = 100A to 500mA Feedback Voltage (ADJ option) Line Regulation Load Regulation(6) Voltage(7)(8) Current(9) VIN = VOUT +1V to 5.5V IOUT = 100A to 500mA IOUT = 50mA IOUT = 500mA Ground Pin IOUT = 0 to 500mA VEN 0.2V f = up to 1kHz; COUT = 2.2F ceramic; CBYP = 0.1F f = 10kHz; COUT = 2.2F ceramic; CBYP = 0.1F Current Limit Output Voltage Noise Turn-On Time Enable Input Enable Input Voltage Logic Low (Regulator Shutdown) Logic High (Regulator Enabled) Enable Input Current VIL 0.2V (Regulator Shutdown) VIH 1.0V (Regulator Enabled)
Notes: 1. Exceeding maximum ratings may damage the device. 2. The device is not guaranteed to work outside its operating rating. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator may go into thermal shutdown. 4. Devices are ESD sensitive. Handling precautions recommended. Human Body Model. 5. Specification for packaged product only. 6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. 7. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below 2.5V, dropout voltage spec does not apply, as part is limited by minimum VIN spec of 2.5V. There may be some typical dropout degradation at VOUT <3V. 8. For ADJ option, VOUT = 3V for dropout specification. 9. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current.
Min -1.0 -2.0 1.2375 1.225
Typ
Max +1.0 +2.0
Units % % V V %/V % mV mV A A dB dB mA Vrms
1.25 1.25 0.04 0.1 20 200 90 0.5 70 60
1.2625 1.275 0.3 0.5 40 400 150
Dropout
Ground Pin Current in Shutdown Ripple Rejection
VOUT = 0V COUT =2.2F, CBYP = 0.1F, 10Hz to 100kHz COUT = 2.2F; CBYP = 0.01F
600
700 40 40 100
s
0.2 1.0 0.01 0.01 1 1
V V A A
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Typical Characteristics
PSRR (Bypass Pin Cap = 0.1F)
50mA 100A PSRR (dB)
100 90 80 70 PSRR (dB) 60 50 40 30 20 10
100 90 80 70 60 50 40 30 20 10
PSRR (Bypass Pin Cap = 0.01F)
GROUND CURRENT (A) 100A
85 80 75 70 65 60 55 0.1
Ground Current
500mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF 1k 100 10k 100k FREQUENCY (Hz) 1M
500mA
50mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF
0 10
0 10
1k 100 10k 100k FREQUENCY (Hz)
1M
Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF Cbyp = 0.01uF 1 10 100 1000 OUTPUT CURRENT (mA)
90 GROUND CURRENT (A) 80 70 60 50 40 30 20 10
Ground Current
GROUND CURRENT (A)
90 80 70 60 50 40 30 20 10
Ground Current
GROUND CURRENT (A)
90 80 70 60 50 40 30 20 10
Ground Current
Iload = 50mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 uF
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Iload = 150mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 uF
Iload = 300mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 uF
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
100 GROUND CURRENT (A) 90 80 70 60 50 40 30 20
Ground Current
GROUND CURRENT (A)
100 90 80 70 60 50 40 30 20 10 0 3
Ground Current
GROUND CURRENT (A)
100 90 80 70 60 50 40 30 20 10 0 3
Ground Current
10 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Iload = 500mA Vout = 2.8V Vin = Vout + 1V Cout = 2.2 uF
Iload = 50mA Vout = 2.8V Cout = 2.2 uF 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
Iload = 150mA Vout = 2.8V Cout = 2.2 uF 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
90 GROUND CURRENT (A) 80 70 60 50 40 30 20 10 0 3
Ground Current
OUTPUT VOLTAGE (V)
3 2.5 2
Dropout Characteristics
DROPOUT VOLTAGE (mV)
30 25 20 15 10 5
Dropout Voltage
150mA 1.5 1 50mA 0.5 0 0 1 2 3 4 INPUT VOLTAGE (V) 5 500mA
Iload = 500mA Vout = 2.8V Cout = 2.2uF 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Iload = 50mA Vout = 2.8V Cout = 2.2uF
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80 DROPOUT VOLTAGE (mV) 70 60 50 40 30 20 10
Dropout Voltage
DROPOUT VOLTAGE (mV)
250 200 150 100 50
Dropout Voltage
DROPOUT VOLTAGE (mV)
200 180 160 140 120 100 80 60 40 20 0 0
Dropout Voltage
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Iload = 150mA Vout = 2.8V Cout = 2.2uF
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Iload = 500mA Vout = 2.8V Cout = 2.2uF
Vout = 2.8V Cout = 2.2uF 100 200 300 400 500
OUTPUT CURRENT (mA)
ENABLE THRESHOLD VOLTAGE (V)
SHORT CIRCUIT CURRENT (mA)
700 600 500 400 300 200 100 3
Short Circuit Current
OUTPUT VOLTAGE (V)
3 2.95 2.9 2.85 2.8 2.75 2.7 2.65
Output Voltage vs. Temperature
1.6 1.4 1.2 1 0.8 0.6 0.4 0.2
Enable Threshold vs. Temperature
Iload = 100uA Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) 6
2.6 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Iload = 100uA Vout = 2.8V Vin = Vout + 1V
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Iload = 100uA Vout = 2.8V Vin = Vout + 1V Cout = 2.2uF
Output Noise Spectral Density
10
NOISE (V/ Hz)
1
Iload = 50 Vout = 2.8V 0.01 Vin = 4.45V Cout = 2.2uF Cbyp = 0.01uF 0.001 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
0.1
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Functional Characteristics
Line Transient Response
5V 4V
Load Transient Response
Output Voltage (10mV/div)
Input Voltage (2V/div)
CBYP = 0.01F VIN = 3.8V COUT = 2.2F 500mA
Output Voltage (100mV/div)
CBYP = 0.01F IOUT = 100A COUT = 2.2F TIME (4s/div)
Output Current (200mA/div)
100mA
TIME (200s/div)
Enable Pin Delay
Enable Voltage (1V/div) Enable Voltage (1V/div)
Shutdown Delay
CBYP = 0.01F RL = 6 COUT = 2.2F VIN = 3.8V
Output Voltage (1V/div)
VOUT = 3V CBYP = 0.01F IOUT = 100A COUT = 2.2F TIME (20s/div)
Output Voltage (1V/div)
TIME (20s/div)
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Functional Diagram
VIN EN QuickStart
VOUT
VREF
Error Amp
BYP Thermal Shutdown MIC5319 GND
Current Limit
MIC5319 Block Diagram - Fixed
VOUT VIN EN QuickStart
VREF
Error Amp ADJ
BYP Thermal Shutdown MIC5319 GND
Current Limit
MIC5319 Block Diagram - Adjustable
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No-Load Stability Unlike many other voltage regulators, the MIC5319 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. Adjustable Regulator Application Adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. The MIC5319 can be adjusted from 1.25V to 5.5V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: R1 VOUT = VREF 1 + R2 VREF = 1.25V
VIN
MIC5319BML
Applications Information
Enable/Shutdown The MIC5319 features an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a "zero" off-modecurrent state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. The active-high enable pin uses CMOS technology and the enable pin cannot be left floating, as this may cause an indeterminate state on the output. Input Capacitor The MIC5319 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1F capacitor is required from the inputto-ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional high frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good design practice in any RF-based circuit. Output Capacitor The MIC5319 requires an output capacitor of 2.2F or greater to maintain stability. The design is optimized for use with lowESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 2.2F ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7Rtype capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. Bypass Capacitor A capacitor can be placed from the bypass pin-to-ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.1F capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique, quick-start circuit allows the MIC5319 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the "Typical Characteristics" section for performance with different bypass capacitors.
VOUT R1 2.2F R2
VIN VOUT EN 1F BYP ADJ GND
Figure 1. Adjustable Voltage Application Thermal Considerations The MIC5319 is designed to provide 500mA of continuous current in a very small MLF package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given an input voltage of 3.3V, output voltage of 2.8V and output current = 500mA, the actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN - VOUT) IOUT + VIN x IGND Because this device is CMOS and the ground current is typically <100A over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (3.3V - 2.8V) x 500mA PD = 0.25W To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation:
T (max) - TA PD (max) = J JA
TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 93C/W
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Table 1 shows junction-to-ambient thermal resistance for the MIC5319 in the 2mm x 2mm MLF package.
Package 2 x 2 MLFTM SOT-23-5 JA Recommended Minimum Footprint 93C/W 235C/W JC 2C/W
Micrel
125C - TA 93C/W
0.25W =
TA = 101.75C Therefore, a 2.8V application at 500mA of output current can accept an ambient operating temperature of 101.75C in a 2mm x 2mm MLF package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the "Regulator Thermals" section of Micrel's Designing with Low-Dropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
Table 1. Thermal Resistance Substituting 0.25W for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The maximum power dissipation must not be exceeded for proper operation.
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Package Information
TOP VIEW
BOTTOM VIEW
DIMENSIONS IN MILLIMETERS
SIDE VIEW
Rev. 02
6-Pin MLFTM (ML)
4AL
TSOT-23-5 (D5)
MICREL, INC.
TEL
2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
FAX
+ 1 (408) 944-0800
+ 1 (408) 474-1000
WEB
http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated.
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