TS3420

2A, 1.25MHz Synchronous Buck Converter

1/9

Version: A12

SOT-26

General Description

TS3420 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode

architecture. The device is available in an adjustable version. Supply current with no load is 200uA and drops to

<1uA in shutdown. The 2.8V to 5.5V input voltage range makes TS3420 ideally suited for single Li-Ion, two to

three AA battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in

portable systems. Switching frequency is internally set at 1.25MHz, allowing the use of small surface mount

inductors and capacitors. The internal synchronous switch increases efficiency and decreases need of an external

schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage.

Features

●

High Efficiency: Up to 96%

●

2.8V to 5.5V Input Voltage Range

●

Output Voltage from 0.6V to VIN

●

Short Circuit Protection (SCP)

●

Build in Soft-Start Function

●

1.25MHz Constant Frequency Operation

●

Up to 2A Output Current

●

No Schottky Diode Required in Application

●

≤1uA Shutdown Current

●

Current Mode Operation for Excellent Line and

Load Transient Response

Application

●

Cellular Phones

●

Digital Still Cameras

●

Portable Electronics

●

USB Devices

Pin Description

Name

Description

EN

Power-off pin

H：normal operation

L：Step-down operation stopped

GND

Ground pin

SW

Switch output pin. Connect external inductor

here. Minimize trace area at this pin to

reduce EMI.

VCC

IC power supply pin

FB

Output Feedback pin

Ordering Information

Part No.

Package

Packing

TS3420CX6 RFG

SOT-26

3Kpcs/ 7” Reel

Note: “G” denote for Halogen Free Product

Application Circuit

Pin Definition:

1. EN

2. Ground

3. Switching Output

4. Input

5. Ground

6. Feedback