Solved by www.DataSheet4U.com
SP7648
TM
Low Reference High efficiency Boost Regulator
FeaTUReS ■ True Shutdown ■ 700m...
Solved by www.DataSheet4U.com
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
2 3 4 5
10 V
OUT
FLASH NC (Test) R LIM
SP7648
10 Pin DFN
9 LX 8 P
GND
7 GND 6 FB
SHDN
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, a 0.3 1charging switch, an anti-ringing inductor switch, undervoltage 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. TYPicaL aPPLicaTiOn ciRcUiT
4.7µH Vin (2.7 - 4.5V) 10µF VBATT On/OFF SHDN RLIM RLIM 1.0K1
®
SP7648
LX 10µF 0.331 D1
VOUT NC 470pF
FLASH GND PGND FB 1K1
R2 Q1
R1
FLaSH
Mar16-06 ...