2016/02/24

A.2

1

EM5845

5V, 3.5A, 1MHz, High Efficiency COT Mode Synchronous Buck Converter

General Description

The EM5845 is a high efficiency synchronous buck converter.

It can support 3.5A continuous output current. The constant

on-time control provides fast transient response and allows a

small footprint when designed all ceramic output capacitors.

Other features include internal soft-start, under-voltage

protection, over-voltage protection, cycle-by-cycle current

limit and thermal shutdown function. With aforementioned

functions, these parts provide customers a compact, high

efficiency, well-protected and cost-effective solutions. These

parts are available in DFN3X3 package.

Ordering Information

Part Number

Package

Remark

EM5845VT

DFN3X3-10L

Diode

Emulation

Mode

Features



Constant On Time Control



2.7V to 5.5V Operating Input Range



0.6V, 1% Voltage Reference Accuracy



Up to 3.5A Output Current



Stable with Low ESR Output Ceramic Capacitors



Default 1 MHz frequency operation



Internal Soft Start / Soft Stop



80m and 40m Internal Power MOSFET Switches



Cycle-by-Cycle Current Limit



Output Under Voltage Protection



Output Over Voltage Protection



Power Good Indicator for Power Sequence Control



Available in a DFN3X3 Package

Applications



Notebook & Tablet



Graphic Cards & MB



Low Voltage Logic Supplies



Chipset Supplies



Server System



SMPS Post Regulators

Pin Configuration

VIN

VIN

VCC

FB

1

2

3

4

5

6

7

8

9

10

GND

SW

SW

SW

POK

EN

NC

Typical Application Circuit

VIN

VCC

FB

GND PAD

SW

SW

POK

EN

VIN

EN

10uF

22uF

1.2uH

VIN

EM5845