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SP6649
Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
ADVANCED INFORMATION
FEATURES Ultra-low 12A Quiescent Current 700mA Output Current at 2.6VIN, 3.3VOUT 94% Efficiency Possible Wide Input Voltage Range: 0.85V to 4.5V 3.3V Fixed Output and adjustable 2.5V to 5.0V Output Range Internal Synchronous Rectifier for High Efficiency 0.3 Charging Switch, 0.3 Synchronous Rectifier Anti-Ringing Inductor Switch Programmable Inductor Peak Current Logic Shutdown Control Under Voltage Lock-Out, 0.62V Programmable Low Battery Detect Small 10 pin MSOP Package
VBATT LBI LBON
1 2 3
Top View 10 pin MSOP Tja=113C/W
10 9 8 7 6
VOUT LX PGND GND FB
RLIM 4 SHDN
5
APPLICATIONS Digital Still Cameras MP3 Players PDA's Pagers Handheld Portable Devices Medical Monitors
DESCRIPTION The SP6649 is an ultra-low quiescent current, high efficiency step-up DC-DC converter ideal for single and dual cell alkaline, or Li-Ion battery applications such as digital still cameras, PDA's, MP3 players, and other portable devices. The SP6649 combines the high delivery associated with PWM control, and the low quiescent current and excellent light-load efficiency of PFM control. The SP6649 features 12A quiescent current, synchronous rectification, a 0.3 charging switch, anti-ringing inductor switch, programmable low battery detect, under-voltage lockout and programmable inductor peak current. The device can be controlled by a 1nA active LOW shutdown pin.
VBATT
C1
1 VBATT LBI LBON RLIM SHDN VOUT 10 9 8 7 6
L1 10uH
+
3.3Vout
2 3 4
47uF
LBI LBON SHDN
RLIM 1.87K
SP6649 LX
PGND GND FB
C4 1uF R1 205K C3 47pF + C2 47uF
5
R2 124K
TBD
Figure 2. Maximum Load Current in Operation
C1 = C2 = Kemet T49C476K010AS, L1 = Sumida CDRH5D28-100 R1 = 374K for 5VOUT
Figure 1. Typical Application Circuit
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
(c) Copyright 2002 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
LX, Vo, VBATT , LBON, FB to GND pin ................................. -0.3 to 6.0V SHDN, LBI ............................................................ -0.3V to VBATT +0.5V Vo, GND, LX Current .................................................................... 1.3A Reverse VBATT Current ............................................................... 220mA Forward VBATT Current ............................................................... 500mA Storage Temperature .................................................. -65 C to 150C Operating Temperature ................................................ -40C to +85C Lead Temperature (Soldering, 10 sec) ....................................... 300 C ESD Rating ........................................................................... 2kV HBM
ADVANCED INFORMATION
SPECIFICATIONS
VBATT=VSHDN = 1.3V, VFB=0V, ILOAD = 0mA, TAMB= -40C to +85C, VOUT = +3.3V, typical values at 27C unless otherwise noted. PARAMETER Input Voltage Operating Range, VBATT Under Voltage Lock-out/UVLO Start-up Input Voltage, VBATT Output Voltage, VO Quiescent Current into VO, IQO Quiescent Current into VBATT, IQB Shutdown Current into VO, ISDO Shutdown Current into VBATT, ISDB Efficiency, RLIM = 4.0K Efficiency, RLIM = 1.87K Inductor Current Limit, IPK Output Current 1.0 3.16 MIN 0.7 0.62 0.85 3.30 12 20 1 200 85 91 85 92 1.2 250 700 150 400 Minimum Off-Time Constant KOFF Maximum On-Time Constant KON NMOS Switch Resistance PMOS Switch Resistance FB Set Voltage, VFB FB Input Current LBI Falling Trip Voltage LBI Hysteresis Low Output Voltage for LBON, VOL Leakage current for LBON SHDN Input Voltage VIL VIH VIL VIH 1.0 0.5 2.0 1 100 nA 0.594 1.20 1.1 3.3 0.30 0.30 1.25 1 0.625 25 0.4 500 0.25 V 0.6 0.6 1.30 100 0.656 V nA V mV V nA VBATT = 1.3V, Isink = 1mA VBATT = 1.3V, VLBON = 3.3V VBATT = 1.3V VBATT = 1.3V VBATT = 2.6V VBATT = 2.6V 1.4 0.9 3.44 22 500 500 500 TYP MAX 4.5 UNITS V V V V A nA nA nA % % % % A mA mA mA mA V*s V*s RLOAD = 3k 3.3V VO preset VOUT = 3.3V, VFB = 1.5V, Toggle SHDN VOUT = 3.3V, VFB = 1.5V VSHDN = 0V VSHDN = 0V, VBATT = 2.6V VBATT = 1.3V, IOUT = 50mA VBATT = 2.6V, IOUT = 100mA VBATT = 1.3V, IOUT = 100mA VBATT = 2.6V, IOUT = 200mA RLIM = 1.17k , I
PK
CONDITIONS After Startup
= 1400/RLIM
VBATT = 1.3V, RLIM = 1.17k VBATT = 2.6V, RLIM = 1.17k VBATT = 1.3V, RLIM = 1.87k VBATT = 2.6V, RLIM = 1.87k tOFF K OFF / (VOUT- VBATT) tON K ON / VBATT INMOS = 100mA IPMOS = 100mA External feedback VFB =1.3V
SHDN Input Current
Rev:001 Date:11/20/03 SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
(c) Copyright 2002 Sipex Corporation
2
PIN DESCRIPTION
PIN NUMBER 1 PIN NAME VBATT DESCRIPTION Battery Voltage pin. The startup circuitry runs off of this pin. The operate circuit also uses this voltage to regulate the off-time [tOFF = KOFF/ (VOUT - VBATT)]. When the battery voltage drops below 0.62V after a successful startup the SP6649 goes into an undervoltage lockout mode (UVLO). Low Battery Input pin. LBI below 0.61V causes the LBON pin to pull down to ground. Use a resistor divider to program the low voltage threshold for each battery configuration. Low Battery Output Not pin. Open drain NMOS output that sinks current to ground when LBI is below 0.625V. Resistor Programmable Inductor Peak Current. By connecting a resistor RLIM from this pin to ground the inductor peak current is set by IPEAK=1400/RLIM. The range for RLIM is 4.0K (for 350mA) to 1.17K (for 1.2A). Shutdown Not. Tie this pin to VBATT for normal operation. Tie this pin to ground to disable all circuitry inside the chip. In shutdown the output voltage will float down to a diode drop below the battery potential. External Feedback pin. Connect this pin to GND for fixed +3.3V operation. Connect this pin to a resistor voltage divider between VOUT and GND for adjustable output operation. Ground pin for the internal regulator bias currents. Switch ground pin. The inductor charging current flows out of this pin. Inductor switching node. Connect one terminal of the inductor to the positive terminal of the battery. Connect the second terminal of the inductor to this pin. The inductor charging current flows into LX, through the internal charging N-channel FET, and out the GND pin. Output Voltage pin. The inductor current flows out of this pin during the off-time. It is also the internal regulator voltage supply, and minimum off-time one shot input. Kelvin connect this pin to the positive terminal of the output capacitor.
ADVANCED INFORMATION
2
LBI
3 4
LBON RLIM
5
SHDN
6
FB
7 8 9
GND PGND LX
10
VOUT
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
(c) Copyright 2002 Sipex Corporation
3
BLOCK DIAGRAM
ADVANCED INFORMATION
VBATT QKILL
LX
charge end VO VBATT Min Toff UVLO R Q CHARGE
VO
IUC undercurrent comparator
+
INTERNAL Vbatt
TOFF
c -
INTERNAL SUPPLY QKILL switch buffer PMOS VO VBATT
VOUT
SHDN
SDI
0.61V
+
c
NMOS
Max Ton
n SDI Ref Block IBIAS 1.25V REF FB 0.61V + c + c
VO
VOLOW S Qn
LX current reference
+ c
LOAD
overcurrent comparator
FB Rlim
Ipkset current control current reference
SWITCH GROUND INTERNAL GROUND
PGND
GND LBON
LBI
0.61V
+ c
SP6649
THEORY OF OPERATION Detailed Desctiption: The SP6649 is a step-up DC-DC converter that starts up with input voltages as low as 0.85V (typically) and operates with input voltages down to 0.62V. The ultra low quiescent current of 12A provides excellent efficiencies. In addition to the 0.3 internal MOSFET the SP6649 has an internal synchronous rectifier eliminating the need for an external diode. An internal inductive-damping switch significantly reduces inductive ringing. If the supply voltage drops below 0.62V the SP6649 goes into under voltage lock-out opening up the internal switches. An externally programmable low battery detector with open drain output provides the user the ability to monitor the supply voltage. The inductor peak current is externally programmable to allow for a range of inductors. Control Scheme: A minimum off-time, current limited pulse frequency modulation (PFM) control scheme combines the high output power and efficiency of a pulse width modulation (PWM) device with the ultra low quiescent current of the traditional PFM. At low to moderate output loads the PFM control provides a higher efficiencies than traditional PWM converters are capable of delivering. At these loads the switching frequency is determined by a minimum off-time (tOFF, MIN) and a maximum on-time (tON, MAX) where: tOFF K tON K
OFF
/ (VOUT - VBATT) and
ON
/ VBATT with
KOFF = 1.1Vs and KON = 3.3Vs.
Rev:001 Date:11/20/03 SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
(c) Copyright 2002 Sipex Corporation
4
At light loads (plot A in Figure 3) the charge cycle will take tON, MAX s. For a 1V battery this would be: tON, MAX = KON / VBATT = 3.3Vs / 1V = 3.3s
Inductor Current vs. Load
llim Ton Max. Toff Min. E. Iripple=Toff* (Vo - Vi)/L llim
ADVANCED INFORMATION
The current built up in the coil during the charge cycle gets fully discharged (discontinuous conduction mode, DCM) When the current in the coil has reached zero the synchronous rectifier switch is opened and the voltage across the coil (from VBATT to LX) is shorted internally to eliminate inductive ringing. With increasing load (plot B in Figure 3) this inductor damping time becomes shorter (because the output will drop quicker below its regulation point due to the heavier load) up to the point where it becomes zero. If the load increases further the SP6649 enters continuous conduction mode (CCM) where there is always current in the inductor. The charge time is still tON,MAX as long as the inductor peak current limit is not reached (plot C in Figure 3). the inductor peak current limit can be programmed by trying a resistor RLIM from the RLIM pin to ground where: IPEAK = 1400 / RLIM
Ton Max.
Toff Min. D. Toff*= (Vo - Vi)/LTon Max.
Toff Min.
C. Iripple=Ton*Vi/L
llim Ton Max. Toff Min. B. Iripple=Ton*Vi/L
llim Ton Max. Toff Min. A. Iripple=Ton*Vi/L
Figure 3. Inductor Current vs. Load
In (plot D of Figure 3) the current reaches the peak current limit during the charge cycle but full load is still not reached becuse at the end of the minimum off-time VOUT was still not below its regulation point. Finally in plot E the maximum load is reached where the discharge time has shrunk to its minimum allowed value tOFF,MIN.
with a maximum recommended IPEAK of 1.2A (or a minimum RLIM of 1.17K ). When the peak current limit is reached the charge time is short-cycled.
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
(c) Copyright 2002 Sipex Corporation
5
PERFORMANCE CHARACTERISTICS 3.3V out, refer to the Circuit in Figure 1, TAMB=+25C.
100 95
ADVANCED INFORMATION
90
Efficiency (%)
85 80 75 70 65 60 0.1 1.0 10.0 Iload (mA) 100.0 1000.0
Vi=3.0V Vi=2.6V Vi=2.0V Vi=1.3V Vi=1.0V
3.400 3.380 3.360 3.340 3.320 3.300 3.280 3.260 3.240 3.220 3.200 0 100 200 300 400 500
ILOAD(mA)
Vi=3.0V Vi=2.6V Vi=2.0V Vi=1.3V Vi=1.0V
Figure 4. Efficiency vs. Load Current
Figure 5. Line/Load Rejection vs. Load Current
100 80
VOUT (V)
400 350 300 250 200 150 100 50 0
1.0 1.5 2.0 Vin (V) 2.5 3.0
Iin (uA)
40 20 0
Io (mA)
60
1.0
1.5
2.0 Vin (V)
2.5
3.0
Figure 6. No Load Battery Current
Figure 7. Maximum Resistive Load Current in Startup
Figure 8. Output Ripple, VIN=2.6V, ILOAD=80mA
Figure 9. Output Ripple, VIN=2.6V, ILOAD=200mA
Rev:001 Date:11/20/03 SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
(c) Copyright 2002 Sipex Corporation
6
PERFORMANCE CHARACTERISTICS 5V out, refer to the Circuit in Figure 1, TAMB=+25C, R1=374K.
100 95 90
Efficiency (%)
5.100 5.080 5.060 5.040 5.020 5.000 4.980 4.960 4.940 4.920 4.900 0 100 200 300 400 500
Iload (mA)
ADVANCED INFORMATION
85 80 75 70 65 60 0.1 1.0 10.0 Iload (mA) 100.0 1000.0
Figure 10. SP6649 5V Efficiency vs. Load Current
Figure 11. SP6649 5V Line/Load Rejection vs. Load Current
300 250 200 150 100 50 0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 Vin (V)
Vout (V)
Vi=4.2V Vi=3.2V Vi=2.6V Vi=2.0V Vi=1.6V
Vi=4.2V Vi=3.2V Vi=2.6V Vi=2.0V Vi=1.6V
500 450 400 350 300 250 200 150 100 50 0 1.0 1.5 2.0 2.5 3.0 Vin (V) 3.5 4.0 4.5
Figure 12. SP6649 5V No Load Battery Current
Figure 13. SP6649 5V Maximum Resistive Load Current in Startup
Figure 14. SP6649 5V Output Ripple, Vin=2.6V, Iload=80mA
Figure 15. SP6649 5V Output Ripple, Vin=2.6V, Iload=200mA
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
Io (mA)
Iin (uA)
(c) Copyright 2002 Sipex Corporation
7
PACKAGE: 10-PIN MSOP
(ALL DIMENSIONS IN MILLIMETERS)
ADVANCED INFORMATION
D e1
O1
E/2
R1 R Gauge Plane L2 Seating Plane
1 2
E
E1
O1
L L1
O
e Pin #1 indentifier must be indicated within this shaded area (D/2 * E1/2)
Dimensions in (mm)
10-PIN MSOP JEDEC MO-187 (BA) Variation MIN NOM MAX 0 0.75 0.17 0.08 0.85 3.00 BSC 4.90 BSC 3.00 BSC 0.50 BSC 2.00 BSC 0.4 0.07 0.07 0 0 0.60 0.95 0.25 10 0.80 8 15 1.1 0.15 0.95 0.27 0.23
A A1 A2 b c D E E1 e e1 L L1 L2 N R R1 O O1
(b)
WITH PLATING
c
BASE METAL
D A2 b A1 A
1
Rev:001 Date:11/20/03 SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator (c) Copyright 2002 Sipex Corporation
8
ORDERING INFORMATION
Part Number Operating Temperature Range Package Type
SP6649EU .................................................. -40C to +85C ........................................................ 10 Pin MSOP SP6649EU/TR ............................................ -40C to +85C ................................ (Tape & Reel) 10 Pin MSOP
ADVANCED INFORMATION
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Rev:001 Date:11/20/03
SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator
(c) Copyright 2002 Sipex Corporation
9

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