ISL6545 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

VIN (min) (V)	1
VIN (max) (V)	12
VOUT (min) (V)	0.6
VOUT (max) (V)	5
IOUT (max) (A)	25

The ISL6545 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 integrates the control, gate drivers, output adjustment, monitoring and protection functions into a single 8 Ld SOIC or 10 Ld DFN package.

The ISL6545 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.

ISL6545 特点

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 Plus Anneal Available (RoHS Compliant)

ISL6545 应用

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

ISL6545 芯片订购指南

芯片型号	产品状态	温度范围	封装尺寸图	潮湿敏感度等级MSL	美元价格US $
ISL6545CBZ	量产	民用级	8 Ld SOIC	1	1
ISL6545CBZ-T	量产	民用级	8 Ld SOIC T+R	1	1
ISL6545CRZ	量产	民用级	10 Ld DFN	1	1.51
ISL6545CRZ-T	量产	民用级	10 Ld DFN T+R	1	1.51
ISL6545IBZ	量产	工业级	8 Ld SOIC	1	1.34
ISL6545IBZ-T	量产	工业级	8 Ld SOIC T+R	1	1.34
ISL6545IRZ	量产	工业级	10 Ld DFN	1	1.98
ISL6545IRZ-T	量产	工业级	10 Ld DFN T+R	1	1.98
ISL6545EVAL1Z	Coming Soon		评估板	N/A	价格录入中
ISL6545EVAL1	停产		评估板	N/A	N/A