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SP6654_05 Datasheet

  • SP6654_05

  • High Efficiency 800mA Synchronous Buck Regulator

  • 17頁(yè)

  • SIPEX

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廬
SP6654
Ideal for portable designs powered with Li Ion battery
High Efficiency 800mA Synchronous Buck Regulator
FEATURES
鈻?/div>
Ultra-low 20碌A(chǔ) Quiescent Current
鈻?/div>
98% Efficiency Possible
鈻?/div>
800mA Output Current
鈻?/div>
2.7V to 5.5V Input Voltage Range
鈻?/div>
Output Adjustable Down to 1.0V
鈻?/div>
No External FET鈥檚 Required
鈻?/div>
1.25A Inductor Peak Current Limit
鈻?/div>
100% Duty Ratio Low Dropout Operation
鈻?/div>
80碌A(chǔ) Light Load Quiescent Current
in Dropout
鈻?/div>
Logic Shutdown Control
鈻?/div>
Programmable UVLO
鈻?/div>
Small 10 pin MSOP Package
鈻?/div>
Power Good Indicator
鈻?/div>
Industry Standard 10 Pin MSOP and
and Small DFN Package
PV
IN
V
IN
PWR
GD
D1
D0
1
2
3
4
5
10
LX
SP6654
10 Pin DFN
9
P
GND
8
GND
7
V
OUT
6
FB
Now Available in Lead Free Packaging
APPLICATIONS
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PDA's
鈻?/div>
DSC's
鈻?/div>
MP3 Players
鈻?/div>
USB Devices
鈻?/div>
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鈥檚 proprietary control loop, 20碌A(chǔ) light
load quiescent current, and 0.3鈩?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
L1
10碌H
10鈩?/div>
R
VIN
CV
IN
1碌F
V
OUT
800mA
VO
C
IN
22碌F
1M
SP6654
P
VIN
V
IN
PWR
GD
LX
P
GND
GND
C
OUT
22碌F
CF
R
F
22pF
PWR
GD
D1
D0
D1
D0
V
OUT
FB
R
I
200K
Date: 2/1/05
SP6654 High Efficiency 800mA Synchronous Buck Regulator
漏 Copyright 2005 Sipex Corporation
1

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