ts3405cs Taiwan Semiconductor Company, Ltd. (TSC), ts3405cs Datasheet

ts3405cs

Manufacturer Part Number

ts3405cs

Description

Pwm Buck Controller

Manufacturer

Taiwan Semiconductor Company, Ltd. (TSC)

Datasheet

1.TS3405CS.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

a Buck converter Vin operate from 3.3V ~ 14V

a Vcc operate from 3.75V ~ 6V

a Buck converter Vin can be greater than Vcc

a 0.8V to Vin output voltage

a ±1.5% over line voltage and temperature

a Simple single –loop control design

a Voltage-mode PWM control

a Loss less, programmable over current protection

a Internal soft start

a Converter can source and sink current

a Fixed oscillator frequency 300KHz

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.

uses lower MOSFET’s Rds(on)

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

a Power supplies for microprocessors

a Subsystem power supplies

a Cable modems, set-top box, DSL modems

a DSP and core communications processor supplies

a Memory supplies

a Personal computer peripherals

a Industrial power supplies

a Low-voltage distributed power supplies

Ordering Information

TS3404

TS3405CS

BOOT

Part No.

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

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ts3405cs Summary of contents

Page 1

... Power supplies for microprocessors a Subsystem power supplies a Cable modems, set-top box, DSL modems a DSP and core communications processor supplies a Memory supplies a Personal computer peripherals a Industrial power supplies a Low-voltage distributed power supplies Ordering Information Part No. Operating Temp. TS3405CS - 4 BOOT V V ...

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 (Iout= 0mA, and Tj = +25 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 ...

Page 4

Typical Application (continued) Vcc_5V U1 CDCPL TS3405 COMP Roffset Single Power 5V and 12V Application U1 CDCPL TS3405 COMP Roffset Adjustable OCP Point Application TS3405 Vcc_12V Rfilter Dboot Cbulk Cboot Boot Vgate Q1 Phase ...

Page 5

Typical Application (continued) H3 Vin_Gun Roset U1 20K_5% C4 105 COMP R2 JP1 2 43K_1 821 Jumper C2 222 R4 1.5K_1% Component Reference design MOSFET Q1¡ BQ2 Inductor L1 No. of input capacitor C13¡ BC14 No. of output ...

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

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