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SP6644 Datasheet Preview

SP6644 Datasheet

High Efficiency Boost DC-DC Regulator

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® SP6644/6645
Single/Dual Alkaline Cell, High Efficiency
Boost DC-DC Regulator
90mA Output Current at 1.3V Input
190mA Output Current at 2.6V Input
+2V to +5.5V Output Range
0.88V Guaranteed Start-Up
92% High Efficiency
1.6µA Quiescent Supply Current at VBATT
Reverse Battery Protection
Internal Synchronous Rectifier
5nA Logic Controlled Shutdown Current
From VBATT
Low-Battery Detection Active LOW Output
Small 8 Pin MSOP Package
Flexibility to Optimize Inductor Type with
Programmable Peak Current Control
No External FETs
VBAT 1
BATTL0 2
RLIM 3
SHDN 4
SP6644
SP6645
8 Pin MSOP
8 V OUT
7 LX
6 GND
4 FB
DESCRIPTION
The SP6644/6645 devices are high-efficiency, low-power step-up DC-DC converters ideal
for single or dual alkaline cell applications such as pagers, remote controls, pointing devices,
medical monitors, and other low-power portable end products. Designers can control the
SP6644 device with an active LOW shutdown input. The SP6644 device features an active
low output for batteries below +1.0V. The SP6645 device features an active low output for
batteries below +2.0V. Both devices contain a 0.8synchronous rectifier, a 0.5
N-channel MOSFET power switch, an internal voltage reference, circuitry for pulse-
frequency-modulation, and an under voltage comparator. The output voltage for the
SP6644/6645 devices is preset to +3.3V + 4% or can be adjusted from +2V to +5.5V by
manipulating two external resistors
TYPICAL APPLICATION CIRCUIT
0.88V to
3.3V Input
47µF
22µH
0.7A
VBATT
LX
RLIM
VOUT
SP6644
SP6645
47µF
+3.3VOUT
SHDN
GND
FB
BATTLO
Rev:B Date 4/13/04
SP6644/6645 High Efficiency Boost Regulator
1
© Copyright 2004 Sipex Corporation




Sipex

SP6644 Datasheet Preview

SP6644 Datasheet

High Efficiency Boost DC-DC Regulator

No Preview Available !

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.
VBATT to GND.............................................-0.3 to 6.0V
VOUT to GND..............................................-0.3 to 6.0V
LX, SHDN, FB, BATTLO, to GND.............-0.3 to 6.0V
Reverse battery Current, TAMB=+25˚C.............220mA
(NOTE 1)
VBATT forward current............................................0.5A
VOUT, LX current......................................................1A
Storage Temperature Range............-65˚C to +165˚C
Lead Temperature (soldering 10s)..................+300˚C
Operating Temperature.......................-40˚C to +85˚C
Power Dissipation Per Package
8-pin µSOIC (derate 4.85mW/OC above +70OC)..........390mW
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
VBATT = VSHDN = 1.3V, ILOAD = 0mA, FB = GND, TAMB = -40oC to +85oC, and typical values are at TAMB = +25oC unless otherwise noted.
PARAMETER
Maximum Operating Input Voltage,
VBATT(MAX)
Start-Up Input Voltage, VBATT
Start-Up Input Voltage, VBATT
Temperature Coefficient
SHDN Input Voltage
VIL
VIH
SHDN Input Current
FB Input Current
FB Set Voltage, VFB
BATTLO Falling Trip Voltage
Output Voltage, V
OUT
Output Voltage Range
N-Channel On-Resistance
P-Channel On-Resistance
MIN. TYP. MAX. UNITS
CONDITIONS
3.3 V
0.82
-1
1.1 V RL = 3k,
mVºC
15 %
% of VBATT
80 % of VBATT
1 100 nA
1 100 nA VFB =1.3V,
1.215 1.262 1.309 V external feedback
0.94
1.88
3.16
2.0
1.00
2.00
3.30
1.06
2.12
3.44
5.5
V
SP6644, VOUT = 3.3V
SP6645, VOUT = 3.3V
V V <0.1V
FB
V external feedback
0.5 1.0
0.8 1.6
VOUT = 3.3V
VOUT = 3.3V
Rev:B Date 4/13/04
SP6644/6645 High Efficiency Boost Regulator
2
© Copyright 2004 Sipex Corporation


Part Number SP6644
Description High Efficiency Boost DC-DC Regulator
Maker Sipex
Total Page 15 Pages
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