SP7648_06 Datasheet, PDF (1/13 Pages) Sipex Corporation – PackageLow Reference High efficiency Boost Regulator

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SP7648
TM
Low Reference High efficiency Boost Regulator
FeaTUReS
■ True Shutdown
■ 700mA Output Current at 3.3V Input; 4.2V
output
■ 92% Efficiency from 2.7V IN to 3.3VOUT
■ Wide Input Voltage Range: 2.7V to 4.5V
■ 5V Fixed or Adjustable Output
■ 0.3 1Switch
■ Integrated Synchronous Rectifier:0.3 1
■ Anti-Ringing Switch Technology
■ Programmable Inductor Peak Current
■ Logic Shutdown Control
■ Low 0.8V or 0.288V Reference Voltage
■ Small 10 pin DFN or MSOP Package
V_{BATT 1}
FLASH ₂
NC (Test) 3
R_{LIM 4}
SHDN 5
10 V_OUT
SP7648 ^{9 LX}
10 Pin DFN ^{8 PGND}
7 GND
6 FB
Now Available in Lead Free Packaging
aPPLicaTiOnS
■ LED Driver
■ Camera Flash
■ Handheld Portable Devices
DeScRiPTiOn
The SP7648 is an ultra-low quiescent current, high efficiency step-up DC-DC converter ideal for
single cell Li-Ion or dual cell alkaline battery applications to drive various LEDs. The SP7648
combines low quiescent current and excellent light-load efficiency of PFM control. The SP7648
features synchronous rectification, a0.31charging switch, an anti-ringing inductor switch, under-
voltage lockout and programmable inductor peak current. The device can be shut down by a
1nA active LOW shutdown pin. A very low 0.288V reference voltage is optimized for driving a
constant current load.
V_in
(2.7 - 4.5V)
10µF
4.7µH
®
TYPicaL aPPLicaTiOn ciRcUiT
On/OFF
R_{LIM 1.0K1}
V_{BATT SP7648 LX}
SHDN
R_LIM
V_OUT
NC
470pF
10µF
FLASH
GND
P_GND FB
0.331
D₁
1K1
R₂
R₁
FLaSH
Q₁
Mar16-06 Rev B
SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator

© 2006 Sipex Corporation