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ISL6525 Datasheet

Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller

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DATASHEET
ISL6525
Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller
FN4998
Rev 3.00
Dec 27, 2004
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/s 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 rDS(ON) of the upper MOSFET which eliminates
the need for a current sensing resistor.
Ordering Information
PART NUMBER
ISL6525CB
ISL6525CBZ
(See Note)
TEMP.
RANGE (oC)
PACKAGE
0 to 70 14 Ld SOIC
0 to 70
14 Ld SOIC
(Pb-free)
PKG.
DWG. #
M14.15
M14.15
*Add “-T” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
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 rDS(ON)
• Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator Programmable from
50kHz to Over 1MHz
• 14 Pin, SOIC Package
Pb-Free Available (RoHS Compliant)
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
FN4998Rev 3.00
Dec 27, 2004
Page 1 of 11


Renesas Electronics Components Datasheet

ISL6525 Datasheet

Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller

No Preview Available !

ISL6525
Typical Application
SS
12V
VCC
MONITOR AND
PROTECTION
RT
OSC
ISL6525
REF
FB +- +-
COMP
OCSET
BOOT
UGATE
PHASE
PVCC +12V
LGATE
PGND
GND
+5V OR +12V
+VO
Block Diagram
OCSET
FB
COMP
RT
VCC
REFERENCE
110%
+-
POWER-ON
RESET (POR)
90%
+-
VCC 10A
10A
200A
+- OVER-
CURRENT
4V
SOFT-
START
DACOUT
+-
ERROR
AMP
PWM
COMPARATOR
+-
INHIBIT
PWM
GATE
CONTROL
LOGIC
OSCILLATOR
DELAY
PGOOD
SS
BOOT
UGATE
PHASE
LGATE
PGND
GND
FN4998 Rev 3.00
Dec 27, 2004
Page 2 of 11


Part Number ISL6525
Description Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller
Maker Renesas
Total Page 11 Pages
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