SP6651A Datasheet, PDF (1/16 Pages) Sipex Corporation – High Efficiency 800mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery

®
SP6651A
High Efficiency 800mA Synchronous Buck Regulator
Ideal for portable designs powered with Li Ion battery
FEATURES
■ DFN Package (3mm x 3mm)
■ 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
■ Over Temperature Protection
■ Logic Shutdown Control
■ Programmable UVLO and Adaptive
Battery Low Output
PV_IN 1
V_IN 2
BLON 3
D1 4
D0 5
10 LX
SP6651A
10 Pin DFN
9 _PGND
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 SP6651A 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 SP6651A’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
SP6651A seamlessly transitions into 100% duty ratio operation further extending useful battery
life. The SP6651A is protected against overload and short circuit conditions with a precise
inductor peak current limit. Other features include programmable under voltage lockout and low
battery detection, externally programmed output voltage down to 1.0V, logic level shutdown
control, and 140°C over temperature shutdown.
TYPICAL APPLICATION SCHEMATIC
2.7V to 5.5V Input
VI
C_IN
22µF
1M
BLON
10Ω
R_VIN
CV_IN
1µF
D1
D0
SP6651A
P_VIN
LX
V_IN
P_GND
BLON
GND
D1
V_OUT
D0
FB
L1
10µH
C_OUT
22µF
V_OUT
800mA
VO
CF
R_F
22pF
R_I
200K
Date: 5/25/04
SP6651A High Efficiency 800mA Synchronous Buck Regulator
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© Copyright 2004 Sipex Corporation