ISL6525 Datasheet, PDF (1/11 Pages) Intersil Corporation – Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller

TM
Data Sheet
ISL6525
March 2001 File Number 4998.1
Buck and Synchronous-Rectifier
Pulse-Width Modulator (PWM) Controller
The ISL6525 provides complete control and protection for a
DC-DC converter optimized for high-performance
microprocessor applications. It is designed to drive two
N Channel MOSFETs in a synchronous-rectified buck
topology. The ISL6525 integrates all of the control, output
adjustment, monitoring and protection functions into a single
package. A programmable delay time for the PGOOD signal
makes it especially suitable for the VTT regulation in
VRM8.5 applications.
The output voltage of the converter can be precisely
regulated to as low as 1.20V, with a maximum tolerance of
±1% over temperature and line voltage variations.
The ISL6525 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/µs slew rate which enables high converter bandwidth for
fast transient performance. The resulting PWM duty ratio
ranges from 0% to 100%.
The ISL6525 protects against over-current conditions by
inhibiting PWM operation. The ISL6525 monitors the current
by using the r_DS(ON) of the upper MOSFET which eliminates
the need for a current sensing resistor.
Ordering Information
TEMP.
PART NUMBER RANGE (^oC)
PACKAGE
ISL6525CB
0 to 70 14 Ld SOIC
PKG.
NO.
M14.15
Features
• Drives Two N-Channel MOSFETs
• Operates From +5V or +12V Input
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation
- 1.20V Internal Reference
- ±1% Over Line Voltage and Temperature
• Programmable delay for PGOOD signal
• Over-Current Fault Monitor
- Does Not Require Extra Current Sensing Element
- Uses MOSFETs r_DS(ON)
• Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator Programmable from
50kHz to Over 1MHz
• 14 Pin, SOIC Package
Applications
• Power Supply for Various Microprocessors
• VTT Regulation for VRM8.5
• High-Power 5V to 3.xV DC-DC Regulators
• Low-Voltage Distributed Power Supplies
Pinout
ISL6525
(SOIC)
TOP VIEW
RT ₁
OCSET 2
SS 3
COMP 4
FB 5
GND 6
PGOOD ₇
14 _DELAY
13 VCC
12 LGATE
11 PGND
10 BOOT
9 UGATE
8 PHASE
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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