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APW7093QAI-TUL Datasheet

  • APW7093QAI-TUL

  • 3A, 1MHz, Step Down DC/DC Regulator

  • 20頁

  • ANPEC

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APW7093
3A, 1MHz, Step Down DC/DC Regulator
Features
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Source/Sink 3A
Up to 1MHz Switches Frequency
Up to 94% Efficiency
Internal PMOS/NMOS Switches
- 70m鈩?40m鈩?On-Resistance at V
IN
= 4.5V
- 90m鈩?60m鈩?On-Resistance at V
IN
= 3V
General Description
The APW7093 is a reversible energy flow, constant-
off-time, pulse-width modulated (PWM), step-down
DC-DC converter. It is ideal for use in notebook and
sub-notebook computers that require 1.1V to 5V
active termination power supplies. This device features
an internal PMOS power switch and internal
synchronous rectifier for high efficiency and reduced
component count. The internal 90m
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PMOS power
switch and 60m
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NMOS synchronous-rectifier switch
easily deliver continuous load currents up to 3A. The
APW7093 accurately tracks an external reference
voltage, produces an adjustable output from 1.1V to
VIN, and achieves efficiencies as high as 94%.
The APW 7093 uses a unique current-mode,
constant-off-time, PWM control scheme that allows
the output to source or sink current. This feature
allows energy to return to the input power supply that
otherwise would be wasted. The programmable
constant-off-time architecture sets switching frequencies
up to 1MHz, allowing the user to optimize performance
trade-offs between efficiency, output switching noise,
component size, and cost. The APW7093 features an
adjustable soft-start to limit surge currents during
startup, a 100% duty-cycle mode for low-dropout
operation, and a low-power shutdown mode that disables
the power switches and reduces supply current below
1碌A(chǔ). The APW7093 is available in a 32-pin QFN with
an exposed backside pad or a 16-pin SSOP.
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鹵1% Output Accuracy
1.1V to V
IN
Adjustable Output Voltage
3V to +5.5V Input Voltage Range
<1碌A(chǔ) Shutdown Supply Current
Programmable Constant-Off-Time Operation
Thermal Shutdown
Adjustable Soft-Start Inrush Current Limiting
Output Short-Circuit Protection
Lead Free Available (RoHS Compliant)
Applications
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Motherboard
Graphics Cards
Cable or DSL Modems, Set Top Boxes
DSP Supplies
Memory Supplies
5V Input DC-DC Regulators
Distributed Power Supplies
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
漏
ANPEC Electronics Corp.
Rev. A.5 - Jun., 2005
1
www.anpec.com.tw

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