SP6641A/6641B
500mA Alkaline DC/DC Boost Regulator in SOT-23
Ultra Low Quiescent Current: 10A
Wide Input Voltage Range: 0.9V to 4.5V
V
LX 1 5
BATT
90mA I at 1.3V Input (SP6641A-3.3V)
OUT
SP6641
500mA I at 2.6V Input (SP6641B-3.3V)
OUT
GND 2
5 Pin SOT-23
100mA I at 2.0V Input (SP6641A-5.0V)
OUT
SHDN
V 3 4
OUT
500mA I at 3.3V Input (SP6641B-5.0V)
OUT
Fixed 3.3V or 5.0V Output Voltage
Up to 87% Efficiency
0.3 NFET R on APPLICATIONS
DS
Startup Voltage Guaranteed at 0.9V PDA's
0.33A Inductor Current Limit (SP6641A) DSC's
1A Inductor Current Limit (SP6641B) CD/MP3 Players
Logic Shutdown Control Pagers
SOT-23-5 Package Digital Cameras
Portable Handheld Medical Devices
Now Available in Lead Free Packaging
DESCRIPTION
The SP6641 is an ultra-low quiescent current, high efficiency, DC-DC boost converter designed
for single and dual cell alkaline, or Li-ion battery applications found in PDAs, MP3 players, and
other handheld portable devices. The SP6641 features a 10A quiescent current, a 0.3 N-
channel charging switch, 0.9V input startup, and a 0.33A or 1.0A inductor current limiting feature.
The SP6641 is offered in a 5 pin SOT-23 package and provides an extremely small power supply
footprint optimized for portable applications. The SP6641 is preset to 3.3V and can be controlled
by a 1nA active LOW shutdown pin.
L1
0.9V to 4.5V
700
V
BATT
650
600
C1
1
LX V 5
BATT
550
500
2
GND
U1
D1
450
SP6641A
SP6641B, 1.0A, 3.3V
4 400
3
V
OUT SHDN
SHDN SP6641B, 1.0A, 5V
350
SP6641A, 0.33A, 3.3V
300
C3
R1
SP6641A, 0.33A, 5V
250
200
V
OUT
150
+3.3V or 5V
C2
100
50
SP6641A 3.3V & 5V: C1 = C2 = 22F Ceramic, L1 = 22H CDRH5D28, 0
D1 = MBR0520, C3 = Open, R1 = Shorted.
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
SP6641B 3.3V & 5V: C1 = C2 = 100F POSCAP, L1 = 10H CDRH5D28,
D1 = ZHCS2000, C3 = 1F Ceramic, R1 = 10 . V (V)
IN
Figure 1. Typical Application Schematic Figure 2. Maximum Load Current in Operation
Rev. 5/26/05, *Patent Pending SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 Copyright 2002 Sipex Corporation
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I (mA)
OUTABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional LX, V , SHDN, V to GND pin ....... -0.3 to 6.0V
OUT BATT
operation of the device at these ratings or any other LX Current .......................................................... 1.5A
above those indicated in the operation sections of Reverse V Current ................................... 220mA
BATT
the specifications below is not implied. Exposure to Storage Temperature ........................ -65C to 150C
absolute maximum rating conditions for extended Operating Temperature ..................... -40C to +85C
periods of time may affect reliability. Lead Temperature (Soldering, 10 sec) .......... 300 C
ELECTRICAL SPECIFICATIONS
V = V = 1.3V, I = 0mA, -40C <T < +85C, V = +3.3V or +5.0V preset, typical values at 27C
BATT SHDN LOAD A OUT
unless otherwise noted.
PARAMETER MIN TYP MAX UNITS CONDITIONS
Input Voltage Operating Range, 0.5 4.5 V after startup
V
BATT
Startup Voltage, V 0.85 0.90 V R =3k, T =27C
BATT LOAD A
1.00 V R =3k,-40C <T < +85C
LOAD A
Output Voltage, V 3.16 3.30 3.44 V 3.3V V preset
OUT OUT
4.80 5.00 5.20 V 5.0V V preset
OUT
Quiescent Current into V,1015 AV =3.5V, 3.3V V preset
OUT OUT OUT
I V =5.5V, 5.0V V preset
Q(OUT) OUT OUT
Quiescent Current into V , 250 500 nA V =3.5V, 3.3V V preset
BATT OUT OUT
I V =5.5V, 5.0V V preset
QB OUT OUT
Shutdown Current into V,1 500 nA V =0V
OUT SHDN
I
SHDN
Shutdown Current into V,20 100 nA V =0V
BATT SHDN
I
SHDN
Inductor Current Limit 280 330 380 mA
(SP6641A)
Inductor Current Limit 850 1000 1150 mA
(SP6641B)
Output Current (SP6641AEK-3.3) 90 mA V =1.3V
BATT
190 mA V =2.6V
BATT
Output Current (SP6641BEK-3.3) 200 mA V =1.3V
BATT
500 mA V =2.6V
BATT
Output Current (SP6641AEK-5.0) 100 mA V =2.0V
BATT
175 mA V =3.3V
BATT
Output Current (SP6641BEK-5.0) 275 mA V =2.0V
BATT
500 mA V =3.3V
BATT
Minimum Off-Time Constant 1.50 V*sT K / (V V )
OFF OFF OUT IN
K
OFF
NMOS Switch Resistance 0.3 0.75 Inmos=100mA
SHDN Input Voltage Vil 20 % % of V
BATT
Vih 80 % % of V
BATT
SHDN Input Current 1 100 nA
Rev. 5/26/05, *Patent Pending SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 Copyright 2002 Sipex Corporation
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