ISL6535
Data Sheet
February 13, 2015
FN9255.2
Synchronous Buck Pulse-Width
Features
Modulator (PWM) Controller
• Operates from +12V input
The ISL6535 is a high performance synchronous controller
for demanding DC/DC converter applications. It provides
overcurrent fault protection and is designed to safely start-up
into prebiased output loads.
• Excellent output voltage regulation
- 0.597V internal reference
- 1% over the commercial temperature range
- 1.5% over the industrial temperature range
• Simple single-loop control design
- Voltage-mode PWM control
The output voltage of the converter can be precisely
regulated to as-low-as 0.597V, with a maximum tolerance of
±1% over the commercial temperature range, and ±1.5%
over the industrial temperature range.
• Fast transient response
- High-bandwidth error amplifier
- Full 0% to 100% duty ratio
- Leading and falling edge modulation
The ISL6535 provides simple, single feedback loop, voltage
mode control with fast transient response. It includes a triangle
wave oscillator that is adjustable from below 50kHz to over
1.5MHz. Full (0% to 100%) PWM duty cycle support is
provided.
• Small converter size
- Constant frequency operation
- Oscillator programmable from 50kHz to over 1.5MHz
• 12V high-speed MOSFET gate drivers
- 2.0A source/3A sink at 12V low-side gate drive
- 1.25A source/2A sink at 12V high-side gate drive
- Drives two N-Channel MOSFETs
The error amplifier features a 15MHz gain bandwidth
product and 6V/µs slew rate, which enables high converter
bandwidth for fast transient performance.
• Overcurrent fault monitor
The ISL6535's overcurrent protection monitors the current
- High-side MOSFET’s r
- Reduced ~120ns blanking time
sensing
DS(ON)
by using the r
of the upper MOSFET, which
DS(ON)
eliminates the need for a current sensing resistor.
• Converter can source and sink current
• Soft-start done and an external reference pin for tracking
applications are available in the QFN package
Pinouts
ISL6535 (14 LD SOIC)
TOP VIEW
• Pin compatible with ISL6522
• Supports start-up into prebiased loads
• Pb-free (RoHS compliant)
14 VCC
1
2
3
4
5
6
7
RT
OCSET
SS
13 PVCC
12
11
LGATE
PGND
Applications
COMP
FB
• Power Supply for some Pentium®, PowerPC™, as-well-as
graphic CPUs
• High-power 12V input DC/DC regulators
• Low-voltage distributed power supplies
10 BOOT
9
8
UGATE
PHASE
EN
GND
ISL6535 (16 LD QFN)
TOP VIEW
16 15 14 13
SS
COMP
FB
1
12 PVCC
11 LGATE
10 PGND
2
3
4
EN
9
BOOT
5
6
7
8
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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