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| 型号： | 45AZ |
| 厂商： | Intersil Corporation |
| 英文描述： | 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller |
| 中文描述： | 单5V或12V同步降压脉宽调制（PWM）控制器 |
| 文件页数： | 1/16页 |
| 文件大小： | 302K |
| 代理商： | 45AZ |
www.DataSheet4U.com
1
FN6305.3
ISL6545, ISL6545A
5V or 12V Single Synchronous Buck
Pulse-Width Modulation (PWM) Controller
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.
Pinout
ISL6545 (SOIC)
TOP VIEW
ISL6545 (10 LD 3x3 DFN)
TOP VIEW
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
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)
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
5
6
8
7
4
3
2
1
UGATE
GND
PHASE
FB
VCC
COMP/SD
BOOT
LGATE/OCSET
1
BOOT
UGATE
N/C
GND
PHASE
COMP/SD
FB
N/C
2
3
4
5
LGATE/OCSET
10
9
8
7
6
VCC
GND
Data Sheet
November 15, 2006
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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