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SP6121CN/TR Datasheet

  • SP6121CN/TR

  • Low Voltage, Synchronous Step Down PWM Controller Ideal for ...

  • 16頁

  • SIPEX

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廬
SP6121
Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters
Low Voltage, Synchronous Step Down PWM Controller
FEATURES
鈻?/div>
Optimized for Single Input Voltage - 3V to 5.5V
8 PDRV
V
CC
1
鈻?/div>
High Efficiency: Greater than 95% possible
SP6121
GND 2
7 NDRV
鈻?/div>
Accurate, 500kHz Fixed Frequency Operation
6 I
SET
V
FB
3
8 Pin SOIC
鈻?/div>
Fast Transient Response
5 I
SENSE
COMP 4
鈻?/div>
500碌A(chǔ), I
Q
(25碌A(chǔ) in Shutdown)
鈻?/div>
Internal, 0.4 V/ms, Soft Start Circuit
鈻?/div>
Precision 1% Reference
Now Available in Lead Free Packaging
鈻?/div>
Resistor Programmable Output Voltage
APPLICATIONS
鈻?/div>
Lossless Adjustable Current Limit with
鈻?/div>
Supply Bias for
鈻?/div>
High Side R
DS(ON)
Sensing
- DSP
鈻?/div>
0% to 100% Duty Cycle Range
- Microprocessor Core
鈻?/div>
High Side PMOS Switch Negates Need for
- I/O & Logic
鈻?/div>
External Charge Pump
鈻?/div>
Video Cards
鈻?/div>
Output Over Voltage Protection
鈻?/div>
Board Level Supply in
鈻?/div>
Hiccup Mode Current Limit Protection
Distributed Power Systems
DESCRIPTION
The SP6121 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. The operating frequency is internally set at 500kHz, permitting the use of
small, surface mount inductors and capacitors. Requiring only few external components, the
SP6121 packaged in an 8-pin SOIC, is especially suited for low voltage applications where cost,
small size and high efficiency are critical. With its low voltage capability and inherent 100% duty
cycle operation, the SP6121 allows low dropout operation in the event of a low input supply
voltage condition.
TYPICAL APPLICATION CIRCUIT
RV
CC
5
廬
RSET
2.3k
Q1
1.8碌H
L1
Q2
DS
C
IN
47碌F
Ceramic 6.3V
3.3V
V
IN
CB
3.3碌F
V
CC
GND
V
FB
COMP
RZ
10k
CZ
3.7nF
PDRV
SP6121
U1
NDRV
I
SET
I
SENSE
1.9V 8A
V
OUT
C
OUT
470碌F x 2
R1
5.2k
R2
10k
CP
50pF
Q1 = FAIRCHILD FDS6375
Q2 = FAIRCHILD FDS6690A
DS = STMICROELECTRONICS STPS2L25BU
Date: 5/25/04
L1 = PANASONIC ETQ-P6F1R6SFA
C
OUT
= SANYO 4TPB470M
漏 Copyright 2004 Sipex Corporation
SP6121 Low Voltage, Synchronous Step Down PWM Controller
1

SP6121CN/TR 產(chǎn)品屬性

  • Exar

  • 開關(guān)變換器、穩(wěn)壓器與控制器

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