SP6654_05 Datasheet, PDF (1/17 Pages) Sipex Corporation – High Efficiency 800mA Synchronous Buck Regulator

®
SP6654
High Efficiency 800mA Synchronous Buck Regulator
Ideal for portable designs powered with Li Ion battery
FEATURES
■ Ultra-low 20µA Quiescent Current
■ 98% Efficiency Possible
■ 800mA Output Current
■ 2.7V to 5.5V Input Voltage Range
■ Output Adjustable Down to 1.0V
■ No External FET’s Required
■ 1.25A Inductor Peak Current Limit
■ 100% Duty Ratio Low Dropout Operation
■ 80µA Light Load Quiescent Current
in Dropout
■ Logic Shutdown Control
■ Programmable UVLO
■ Small 10 pin MSOP Package
■ Power Good Indicator
■ Industry Standard 10 Pin MSOP and
and Small DFN Package
PV_IN 1
V_IN 2
PWR_GD 3
D1 4
D0 5
10 LX
SP6654
10 Pin DFN
9 P_GND
8 GND
7 _VOUT
6 _FB
Now Available in Lead Free Packaging
APPLICATIONS
■ PDA's
■ DSC's
■ MP3 Players
■ USB Devices
■ Point of Use Power
DESCRIPTION
The SP6654 is a 800mA synchronous buck regulator which is ideal for portable applications that
use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6654’s proprietary control loop, 20µA light
load quiescent current, and 0.3Ω power switches provide excellent efficiency across a wide range
of output currents. As the input battery supply decreases towards the output voltage the SP6654
seamlessly transitions into 100% duty ratio operation further extending useful battery life. The
SP6654 is protected against overload and short circuit conditions with a precise inductor peak
current limit. Other features include programmable under voltage lockout, externally pro-
grammed output voltage down to 1.0V, logic level shutdown control, and an open drain power
good indicator when V_OUT is above 94% of its programmed value.
TYPICAL APPLICATION SCHEMATIC
2.7V to 5.5V Input
VI
C_IN
22µF
1M
PWR_GD
10Ω
R_VIN
CV_IN
1µF
D1
D0
SP6654
P_VIN
LX
V_IN
P_GND
PWR_GD
GND
D1
V_OUT
D0
FB
L1
10µH
C_OUT
22µF
V_OUT
800mA
VO
CF
R_F
22pF
R_I
200K
Date: 2/1/05
SP6654 High Efficiency 800mA Synchronous Buck Regulator
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© Copyright 2005 Sipex Corporation