APW7093 Datasheet, PDF (1/20 Pages) Anpec Electronics Coropration – 3A, 1MHz, Step Down DC/DC Regulator

APW7093
3A, 1MHz, Step Down DC/DC Regulator
Features
General Description
• Source/Sink 3A
• Up to 1MHz Switches Frequency
• Up to 94% Efficiency
• Internal PMOS/NMOS Switches
- 70mΩ/40mΩ On-Resistance at VIN = 4.5V
- 90mΩ/60mΩ On-Resistance at VIN = 3V
• ±1% Output Accuracy
• 1.1V to VIN Adjustable Output Voltage
• 3V to +5.5V Input Voltage Range
• <1µA 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
• Motherboard
• Graphics Cards
• Cable or DSL Modems, Set Top Boxes
• DSP Supplies
• Memory Supplies
• 5V Input DC-DC Regulators
• Distributed Power Supplies
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 90mΩ PMOS power
switch and 60mΩ 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 APW7093 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
1µA. The APW7093 is available in a 32-pin QFN with
an exposed backside pad or a 16-pin SSOP.
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 © ANPEC Electronics Corp.
1
Rev. A.5 - Jun., 2005
www.anpec.com.tw