SP6655ER-L Datasheet, PDF (1/16 Pages) Sipex Corporation – High Efficiency 400mA Synchronous Buck Regulator

®
SP6655
High Efficiency 400mA Synchronous Buck Regulator
Ideal for portable designs powered with Li Ion battery
FEATURES
■ 98% Efficiency Possible
■ Small 10-Pin DFN Package
■ 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
P_VIN 1
VIN 2
BLON 3
D1 4
D0 5
10 _LX
SP6655 ^{9 PGND}
10 Pin DFN
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 SP6655 is a 400mA synchronous buck regulator which is ideal for portable applications that
use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6655’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 SP6655
seamlessly transitions into 100% duty ratio operation, further extending useful battery life. The
SP6655 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
10µF
1M
BLON
10Ω
R_VIN
CV_IN
1µF
D1
D0
SP6655
P_VIN
LX
V_IN
P_GND
BLON
GND
D1
V_OUT
D0
FB
L1
10µH
C_OUT
10µF
V_OUT
400mA
VO
CF
R_F
22pF
R_I
200K
Date: 09/27/05
SP6655 High Efficiency 400mA Synchronous Buck Regulator
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© Copyright 2004 Sipex Corporation