DATASHEET
ISL6545, ISL6545A
5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
FN6305
Rev 7.00
October 7, 2015
The ISL6545, ISL6545A makes simple work out of
implementing a complete control and protection scheme for a
DC/DC stepdown converter driving N-Channel MOSFETs in a
synchronous buck topology. Since it can work with either 5V or
12V supplies, this one IC can be used in a wide variety of
applications within a system. The ISL6545, ISL6545A
(hereafter referred to as “ISL6545x”, except as needed)
integrates the control, gate drivers, output adjustment,
monitoring and protection functions into a single 8 Ld SOIC or
10 Ld DFN package.
The ISL6545x provides single feedback loop, voltage-mode
control with fast transient response. The output voltage can be
precisely regulated to as low as 0.6V, with a maximum
tolerance of ±1.0% over-temperature and line voltage
variations. A selectable fixed frequency oscillator (ISL6545 for
300kHz; ISL6545A for 600kHz) reduces design complexity,
while balancing typical application cost and efficiency.
The error amplifier features a 20MHz gain-bandwidth
product and 9V/µs slew rate which enables high converter
bandwidth for fast transient performance. The resulting
PWM duty cycles range from 0% to 100%.
Protection from overcurrent conditions is provided by
monitoring the rDS(ON) of the lower MOSFET to inhibit PWM
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
Pinout
ISL6545, ISL6545A
(8 LD SOIC)
TOP VIEW
BOOT 1
UGATE 2
GND 3
LGATE/OCSET 4
8 PHASE
7 COMP/SD
6 FB
5 VCC
ISL6545, ISL6545A
(10 LD 3x3 DFN)
TOP VIEW
BOOT
UGATE
N/C
GND
LGATE/OCSET
1
2
3
4
5
GND
10 PHASE
9 COMP/SD
8 FB
7 N/C
6 VCC
Features
• Operates from +5V or +12V Supply Voltage (for bias)
- 1.0V to 12V VIN Input Range (up to 20V possible with
restrictions; see Input Voltage Considerations)
- 0.6V to VIN Output Range
- Integrated Gate Drivers use VCC (5V to 12V)
- 0.6V Internal Reference; ±1.0% tolerance
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
- Drives N-Channel MOSFETs
- Traditional Dual Edge Modulator
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
• Lossless, Programmable Overcurrent Protection
- Uses Lower MOSFET’s rDS(ON)
• Small Converter Size in 8 Ld SOIC or 10 Ld DFN
- 300kHz or 600kHz Fixed Frequency Oscillator
- Fixed Internal Soft-Start, Capable into a Pre-biased
Load
- Integrated Boot Diode
- Enable/Shutdown Function on COMP/SD Pin
- Output Current Sourcing and Sinking
• Pb-Free (RoHS Compliant)
Applications
• Power Supplies for Microprocessors or Peripherals
- PCs, Embedded Controllers, Memory Supplies
- DSP and Core Communications Processor Supplies
• Subsystem Power Supplies
- PCI, AGP; Graphics Cards; Digital TV
- SSTL-2 and DDR/DDR2/DDR3 SDRAM Bus
Termination Supply
• Cable Modems, Set Top Boxes, and DSL Modems
• Industrial Power Supplies; General Purpose Supplies
• 5V or 12V-Input DC/DC Regulators
• Low-Voltage Distributed Power Supplies
FN6305 Rev 7.00
October 7, 2015
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