APW1172 データシートの表示（PDF） - Anpec Electronics
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APW1172 Datasheet PDF : 21 Pages
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APW1172
2.5A SWITCH STEP DOWN SWITCHING REGULATOR
Features
General Description
• 2.5A Internal Switch
• Operating Input Voltage from 4.8V to 22V
• 3.3V ±2% Reference Voltage
• Output Voltage :
APW1172 - adjustable from 1.235V to 20V
• Low Dropout Operation: 100% Duty Cycle
• 250KHz Internally Fixed Frequency
• Voltage Feed-Forward
• Zero Load Current Operation
• Internal Current Limit
• Inhibit for Zero Current Consumption
• Synchronization
• Protection Against Feedback Disconnection
• Thermal Protection
• External Soft-Start
• Over-Voltage Protection
• Lead Free Available (RoHS Compliant)
Applications
• Consumer: STB, DVD, TV, VCR, Car Radio,
LCD monitors
• Networking: XDSL, Modems, DC-DC Modules
• Computer: Printers, Audio/Graphic Cards,
Optical Storage, Hard Disk Drive
• Industrial: Chargers, Car Battery DC-DC
Converters
The APW1172 is a step down monolithic power
switching regulator with a switching current limit of
3.8A so it is able to deliver more than 2.5A DC current
to the load depending on the application conditions.
The output voltage can be set from 1.235V to 22V.The
high current level is also achieved utilize an SO8
package with exposed pad frame. The type of package
allows to re-duce the Rth (j-amb) down to approximately
45°C/W.
An internal oscillator fixes the switching frequency at
250KHz.
Having a minimum input voltage of 4.8V only, it is
particularly suitable for 5V bus, available in all computer
related applications.
Pulse by pulse current limit with the internal frequency
modulation offers an effective constant current short
circuit protection.
Pin Description
OUT 1
SYNC 2
INH 3
COMP 4
8 VCC
7 GND
6 VREF
5 FB
SOP-8-P (Top View)
= Thermal Pad
(connected to GND plane for better heat
dissipation)
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.4 - Aug., 2005
www.anpec.com.tw
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