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ISL8105B Datasheet

  • ISL8105B

  • +5V or +12V Single-Phase Synchronous Buck Converter PWM Cont...

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ISL8105B
Data Sheet
February 13, 2007
FN6447.0
+5V or +12V Single-Phase Synchronous
Buck Converter PWM Controller with
Integrated MOSFET Gate Drivers,
Extended Soft-Start Time
The ISL8105B is a simple single-phase PWM controller for a
synchronous buck converter. It operates from +5V or +12V bias
supply voltage. With integrated linear regulator, boot diode, and
N-Channel MOSFET gate drivers, the ISL8105B reduces
external component count and board space requirements.
These make the IC suitable for a wide range of applications.
Utilizing voltage-mode control, the output voltage can be
precisely regulated to as low as 0.6V. The 0.6V internal
reference features a maximum tolerance of 鹵1.0% over the
commercial temperature range, and 鹵1.5% over the
industrial temperature range. The controller operates with a
fixed switching frequency of 300kHz.
The ISL8105B features the capability of safe start-up with
pre-biased load. It also provides overcurrent protection by
monitoring the on resistance of the bottom-side MOSFET to
inhibit PWM operation appropriately. During start-up interval,
the resistor connected to BGATE/BSOC pin is employed to
program overcurrent protection condition. This approach
simplifies the implementation and does not deteriorate
converter efficiency.
Features
鈥?Operates from +5V or +12V Bias Supply Voltage
- 1.0V to 12V Input Voltage Range (up to 20V possible
with restrictions; see Input Voltage Considerations)
- 0.6V to V
IN
Output Voltage Range
鈥?0.6V Internal Reference Voltage
- 鹵1.0% Tolerance Over the Commercial Temperature
Range (0擄C to +70擄C)
- 鹵1.5% Tolerance Over the Industrial Temperature
Range (-40擄C to +85擄C).
鈥?Integrated MOSFET Gate Drivers that Operate from
V
BIAS
(+5V to +12V)
- Bootstrapped High-side Gate Driver with Integrated
Boot Diode
- Drives N-Channel MOSFETs
鈥?Simple Voltage-Mode PWM Control
鈥?Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
鈥?Fixed 300kHz Operating Frequency
鈥?Fixed Internal Soft-Start with Pre-biased Load Capability
鈥?Lossless, Programmable Overcurrent Protection
- Uses Bottom-side MOSFET鈥檚 r
DS(ON)
鈥?Enable/Disable Function Using COMP/EN Pin
鈥?Output Current Sourcing and Sinking Currents
鈥?Pb-Free Plus Anneal Available (RoHS Compliant)
Pinouts
ISL8105B
(10 LD 3X3 DFN)
TOP VIEW
BOOT
TGATE
N/C
GND
BGATE/BSOC
1
2
3
4
5
GND
10 LX
9
8
7
6
COMP/EN
FB
N/C
VBIAS
Applications
鈥?5V or 12V DC/DC Regulators
鈥?Industrial Power Systems
鈥?Telecom and Datacom Applications
鈥?Test and Measurement Instruments
鈥?Distributed DC/DC Power Architecture
ISL8105B
(8 LD SOIC)
TOP VIEW
鈥?Point of Load Modules
BOOT 1
TGATE 2
GND
3
8
7
6
5
LX
COMP/EN
FB
VBIAS
BGATE/BSOC 4
1
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. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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