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SP6123 Datasheet(PDF) 1 Page - Sipex Corporation

Part No. SP6123
Description  Low Voltage, Synchronous Step-Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters
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Maker  SIPEX [Sipex Corporation]
Homepage  http://www.sipex.com
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SP6123 Datasheet(HTML) 1 Page - Sipex Corporation

 
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Date: 5/25/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller
© Copyright 2004 Sipex Corporation
SP6123/SP6123A
■ Optimized for Single Supply, 3V - 5.5V Applications
■ High Efficiency: Greater Than 95% Possible
■ Accurate Fixed 300kHz (SP6123) or 500kHz
(SP6123A) Frequency Operation
■ Fast Transient Response
■ Internal Soft Start Circuit
■ Accurate 0.8V Reference Allows Low Output
Voltages
■ Resistor Programmable Output Voltage
■ Loss-less Current Limit with High Side RDS(ON)
Sensing
■ Hiccup Mode Current Limit Protection
■ Dual N-Channel MOSFET Synchronous Driver
■ Quiescent Current: 500µA, 30µA in Shutdown
■ 8-Pin Surface Mount Package
Low Voltage, Synchronous Step-Down PWM Controller
Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters
APPLICATIONS
■ DSP
■ Microprocessor Core
■ I/O & Logic
■ Industrial Control
■ Distributed Power
■ Low Voltage Power
The SP6123 is a fixed frequency, voltage mode, synchronous PWM controller designed to
work from a single 5V or 3.3V input supply, providing excellent AC and DC regulation for high
efficiency power conversion. Requiring only few external components, the SP6123 pack-
aged in an 8-pin NSOIC, is especially suited for low voltage applications where cost, small
size and high efficiency are critical. The operating frequency is internally set to 300kHz
(SP6123) or 500kHz (SP6123A), allowing small inductor values and minimizing PC board
space. The SP6123 drives an all N-channel synchronous power MOSFET stage for improved
efficiency and includes an accurate 0.8V reference for low output voltage applications.
®
TYPICAL APPLICATION CIRCUIT
BST
SWN
VCC
VFB
COMP
GH
GL
GND
CC
4.7nF
RZ
15k
CB
2.2µF
VIN
SP6123A
CP
56pF
FDS6890A
CIN
680µF
R1
10k
VOUT
IN
0.8V to 5.0V
2A to 10A
(1.6V, 4A shown)
CBST
1µF
MBR0530
L1
1.5µH
FDS6890A
COUT1
470µF
COUT3
1µF
R2
10k
COUT2
470µF
STPS2L25U
3V to 5.5V
1
2
3
4
5
6
7
8
COMP
GL
BST
GH
SWN
VFB
VCC
SP6123
8 Pin NSOIC
GND
Now Available in Lead Free Packaging
DESCRIPTION


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