TS3404_1 TSC [Taiwan Semiconductor Company, Ltd], TS3404_1 Datasheet

TS3404_1

Manufacturer Part Number

TS3404_1

Description

Single Synchronous Buck PWM Controller

Manufacturer

TSC [Taiwan Semiconductor Company, Ltd]

Datasheet

1.TS3404_1.pdf (10 pages)

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TS3405

General Description

The TS3405 makes simple work out of implementing a complete control and protection scheme for a DC-DC step-down

converter. Designed to drive N-channel MOSFETs in a synchronous buck topology, the TS3405 integrates the control,

output a adjustment, monitoring and protection functions.

The TS3405 provides simple, single feedback loop, voltage mode control with fast transient response. The output voltage

can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1.5% over temperature and line voltage

variations. A fixed frequency oscillator reduces design complexity, while balancing typical application cost and efficiency.

The error amplifier features a 15MHz gain-bandwidth product and 8V/uS slew rate, which enables high converter

bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%. The protection from

over current conditions is provided by monitoring the Rds(on) of the lower MOSFET to inhibit PWM operation

appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current

sense resistor.

Features

Absolute Maximum Rating

Supply Voltage

Operating Supply Voltage

Absolute Boot Voltage

Upper Driver Supply Voltage

Input, Output or I/O Voltage

Operating Junction Temperature Range

Ambient Temperature Range

Storage Temperature Range

Lead Temperature 1.6mm(1/16”) from case for 10Sec.

Buck converter Vin operate from 3.3V ~ 14V

Vcc operate from 3.75V ~ 6V

Buck converter Vin can be greater than Vcc

0.8V to Vin output voltage

±1.5% over line voltage and temperature

Simple single –loop control design

Voltage-mode PWM control

Loss less, programmable over current protection

uses lower MOSFET’s Rds(on)

Internal soft start

Converter can source and sink current

Fixed oscillator frequency 300KHz

Pin assignment

1. Boot

2. Ugate

3. Gnd

4. Lgate

Single Synchronous Buck PWM Controller

8. Phase

7. COMP

6. FB

5. Vcc

1-10

Applications

Ordering Information

TS3404

TS3405CS

BOOT

Part No.

Power supplies for microprocessors

Subsystem power supplies

Cable modems, set-top box, DSL modems

DSP and core communications processor supplies

Memory supplies

Personal computer peripherals

Industrial power supplies

Low-voltage distributed power supplies

BOOT

LEAD

STG

PHASE

Oscillator Frequency up to 300KHz

Drives N-Channel MOSFETs

0.8V Internal Reference

Gnd-0.3V to Vcc+0.3V

Operating Temp.

-40 ~ +85

-40 ~ +125

-65 ~ +150

-40 ~ +85

4.5 ~ 5.5

2003/12 rev. A

260

SOP-8

Package

Related parts for TS3404_1

TS3404_1 Summary of contents

Page 1

Single Synchronous Buck PWM Controller Pin assignment 1. Boot 2. Ugate 3. Gnd 4. Lgate General Description The TS3405 makes simple work out of implementing a complete control and protection scheme for a DC-DC step-down converter. Designed to drive N-channel ...

Page 2

Pin Descriptions No. Pin. This pin provides ground referenced bias voltage to the upper MOSFET driver Boot bootstrap circuit is used to create a voltage suitable to drive a logic-lever N-channel MOSFET. It can take 20V as the ...

Page 3

Electrical Characteristics Parameter Vcc supply current Nominal supply Power-on reset Rising Vcc power-on reset threshold Vcc power-on reset threshold Hysteresis Oscillator Frequency Ramp amplitude Reference Reference voltage Tolerance Nominal reference voltage Error Amplifier DC Gain Gain-bandwidth product Slew rate Gate ...

Page 4

Typical Application (continued) U1 CDCPL COMP Roffset Single Power 5V and 12V Application U1 CDCPL COMP Roffset Adjustable OCP Point Application TS3405 Vcc_5V Vcc_12V Rfilter Dboot Cboot Boot Vgate TS3405 Phase Lgate RS Vin ...

Page 5

Typical Application (continued) H3 Vin_Gun Roset 20K_5% C4 105 R2 JP1 43K_1 821 Jumper C2 222 R4 1.5K_1% Component Reference design MOSFET Inductor No. of input capacitor C13、C14 No. of output capacitor C8、C9、C10 No. of decoupling C5A、C5B ...

Page 6

Functional Description Start Up The TS3405 automatically initializes upon receipt of power. The Power-On Reset (POR) function continually monitors the bias voltage at the Vcc pin. The POR function initiates the Soft Start (SS) operation after the supply voltage exceeds ...

Page 7

Application Guidelines Component Selection Input Capacitor Use a mix of input bypass capacitors to control the voltage overshoot across the MOSFETs. Use small ceramic capacitors for high frequency decoupling and bulk capacitors to supply the current needed each time Q1 ...

Page 8

Application Guidelines (continued) Output Inductor The output inductor is selected to meet the output voltage ripple requirements and minimize the converter’s response time to the load transient. The inductor value determines the converter’s ripple current and the ripple voltage is ...

Page 9

Application Guidelines (continued) The equations below relate the compensation network’s poles, zeros and gain to the components (R C and Fig. 7. Use these guidelines for locating the 2 3 poles and zeros of the compensation network: ...

Page 10

TS3405 SOP-8 Mechanical Drawing MILLIMETERS DIM MIN A 4.80 B 3.80 C 1.35 D 0.35 F 0.40 G 1.27 (typ 5.80 ...

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