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ISL6430CB Datasheet

  • ISL6430CB

  • Single Sync Buck PWM Controller for Broadband Gateway Applic...

  • 400.59KB

  • 12頁

  • INTERSIL   INTERSIL

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ISL6430
Data Sheet
July 2003
FN9017.2
Single Sync Buck PWM Controller for
Broadband Gateway Applications
The ISL6430 provides complete control and protection for a
DC-DC converter optimized for high-performance broadband
gateway applications. It is designed to drive two N Channel
MOSFETs in a synchronous-rectified buck topology. The
ISL6430 integrates all of the control, output adjustment,
monitoring and protection functions into a single package.
The output voltage of the converter can be precisely
regulated to as low as 1.27V, with a maximum tolerance of
鹵1%
over temperature and line voltage variations.
The ISL6430 provides simple, single feedback loop, voltage-
mode control with fast transient response. It includes a
200kHz free-running triangle-wave oscillator that is
adjustable from below 50kHz to over 1MHz. The error
amplifier features a 15MHz gain-bandwidth product and
6V/碌s slew rate which enables high converter bandwidth for
fast transient performance. The resulting PWM duty ratio
ranges from 0% to 100%.
The ISL6430 protects against over-current conditions by
inhibiting PWM operation. The ISL6430 monitors the current
by using the r
DS(ON)
of the upper MOSFET which eliminates
the need for a current sensing resistor.
Features
鈥?Drives Two N-Channel MOSFETs
鈥?Operates From +5V or +12V Input
鈥?Simple Single-Loop Control Design
- Voltage-Mode PWM Control
鈥?Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
鈥?Excellent Output Voltage Regulation
- 1.27V Internal Reference
-
鹵1%
Over Line Voltage and Temperature
鈥?Over-Current Fault Monitor
- Does Not Require Extra Current Sensing Element
- Uses MOSFETs r
DS(ON)
鈥?Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator Programmable from
50kHz to Over 1MHz
鈥?14-Lead SOIC and 16-Lead QFN
Applications
鈥?Cable Modems, Set-Top Boxes and DSL Modems
鈥?DSP and Core Communications Processor Supplies
Ordering Information
TEMP.
PART NUMBER RANGE (
o
C)
ISL6430CB
ISL6430CR
0 to 70
0 to 70
PACKAGE
14 Ld SOIC
16 Ld QFN
PKG. DWG. #
M14.15
L16.5x5B
鈥?High-Power 5V Input DC-DC Regulators
鈥?Low-Voltage Distributed Power Supplies
Add -T suffix to either option for tape and reel packaging.
Pinout
ISL6430 (SOIC)
TOP VIEW
RT
OCSET
SS
COMP
FB
EN
GND
1
2
3
4
5
6
7
14 VCC
SS
13 PVCC
12 LGATE
11 PGND
10 BOOT
9
8
UGATE
PHASE
NC
COMP
FP
EN
1
2
3
4
5
NC
6
GND
7
PHASE
8
UGATE
12
11
10
9
PVCC
LGATE
PGND
BOOT
ISL6430 (QFN)
TOP VIEW
OCSET
VCC
13
16
15
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2003. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
RT
14

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