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A8650 Datasheet(PDF) 3 Page - Allegro MicroSystems

Part # A8650
Description  Low Input Voltage, Adjustable Frequency 2 A Synchronous Buck Regulator with EN/SYNC and Power OK
PDF  31 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8650 Datasheet(HTML) 3 Page - Allegro MicroSystems

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Low Input Voltage, Adjustable Frequency
2 A Synchronous Buck Regulator with EN/SYNC and Power OK
A8650
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Table of Contents
Specifications
2
Functional Block Diagram
4
Pin-out Diagram and Terminal List
5
Characteristic Performance
9
Functional Description
11
Overview
11
Reference Voltage
11
Oscillator/Switching Frequency
11
Transconductance Error Amplifier
11
Slope Compensation
11
Sleep Mode
12
Enable/Synchronization (EN/SYNC) Input
12
Power MOSFETs
12
Pulse Width Modulation (PWM)
13
Current Sense Amplifier
13
Soft Start (Startup) and Inrush Current Control
13
Pre-Biased Startup
13
Power OK (POK) Output
14
Protection Features
14
Undervoltage Lockout (UVLO)
14
Thermal Shutdown (TSD)
14
Overvoltage Protection (OVP)
14
Cycle-by-Cycle Overcurrent Protection (OCP)
14
Output Short Circuit (Hiccup Mode) Protection
15
Application Information
18
Design and Component Selection
18
Setting the Output Voltage (VOUT, RFB1, RFB2)
18
Base PWM Switching Frequency (RFSET)
18
Output Inductor (LO)
19
Output Capacitors
20
Input Capacitors
21
Soft Start and Hiccup Mode Timing (CSS)
21
Compensation Components (RZ, CZ, CP)
22
A Generalized Tuning Procedure
24
Power Dissipation and Thermal Calculations
25
PCB Component Placement and Routing
27
Package Outline Drawing
29



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