SP6656_06 Datasheet, PDF (1/16 Pages) Sipex Corporation – High Efficiency 400mA Synchronous Buck Regulator with Dynamically Adjustable Voltage Output

SP6656
High Efficiency 400mA Synchronous Buck Regulator
with Dynamically Adjustable Voltage Output
FEATURES
■ 98% Efficiency Possible
■ Offered in small 2.4 x 2.5mm DFN
■ Ultra-low 20µA Quiescent Current
■ 625mA Inductor Peak Current Limit
■ Guaranteed Minimum 400mA Output
Current
■ 2.7V to 5.5V Input Voltage Range
■ Output Adjustable Down to 1.0V
■ 100% Duty Ratio Low Dropout
Operation
■ 80µA Light Load Quiescent Current in
Dropout
■ Dynamic Adjustable Output Voltage
■ Ideal for portable designs powered with
Li Ion battery
P_VIN 1
VIN 2
OVSO 3
OVSI 4
EN 5
SP6656
10 Pin DFN
10 _LX
9 PGND
8 GND
7 VOUT
6 FB
Now Available in Lead Free Packaging
APPLICATIONS
■ Cell Phones
■ PDA's
■ DSC's
■ MP3 Players
■ USB Devices
■ Point of Use Power
DESCRIPTION
The SP6656 is a 400mA synchronous buck regulator that is ideal for portable applications that
use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6656’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 SP6656
seamlessly transitions into 100% duty ratio operation further extending useful battery life. The
SP6656 is protected against overload and short circuit conditions with a precise inductor peak
current limit. Other features include externally programmable output voltage down to 1.0V,
dynamically adjustable output voltage, logic level shutdown control, and 140°C over temperature
shutdown.
TYPICAL APPLICATION SCHEMATIC
2.7V to 5.5V Input
VI
C_IN
10Ω
R_VIN
10µF
CV_IN
1µF
SP6656
P_VIN
LX
V_IN
P_GND
OVSO
GND
OVSI
V_OUT
EN
FB
3.2 x 1.6 x 1.55mm
L1
10µH
C_OUT
10µF
R_S
V_OUT
400mA
VO
CF
R_F
22pF
R_I
Date: 3/6/06
SP6656, 400mA Synchronous Buck Regulator with Dynamically Adjustable Voltage Output
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© Copyright 2006 Sipex Corporation