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  Taiwan Semiconductor (TSMC) Electronic Components Datasheet  

TS3405 Datasheet

Single Synchronous Buck PWM Controller

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TS3404
Single Synchronous Buck PWM Controller
Pin assignment
1. Boot 8. Phase
2. Ugate 7. COMP
3. Gnd 6. FB
4. Lgate 5. Vcc
Oscillator Frequency up to 300KHz
0.8V Internal Reference
Drives N-Channel MOSFETs
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
Applications
Buck converter Vin operate from 3.3V ~ 14V
Power supplies for microprocessors
Vcc operate from 3.75V ~ 6V
DataSheet4US.ucbosmystem power supplies
Buck converter Vin can be greater than Vcc
Cable modems, set-top box, DSL modems
0.8V to Vin output voltage
DSP and core communications processor supplies
±1.5% over line voltage and temperature
Memory supplies
Simple single –loop control design
Personal computer peripherals
Voltage-mode PWM control
Industrial power supplies
Loss less, programmable over current protection
Low-voltage distributed power supplies
uses lower MOSFET’s Rds(on)
Internal soft start
Ordering Information
Converter can source and sink current
Fixed oscillator frequency 300KHz
Part No.
TS3405CS
Operating Temp.
-40 ~ +85 oC
Package
SOP-8
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.
DataSheet4U.com
VCC
VCC
VBOOT
VBOOT VPHASE
TJ
TJ
TSTG
TLEAD
6
4.5 ~ 5.5
20
20
Gnd-0.3V to Vcc+0.3V
-40 ~ +125
-40 ~ +85
-65 ~ +150
260
V
V
V
V
V
oC
oC
oC
oC
DataShee
TS3405
DataSheet4 U .com
1-10 2003/12 rev. A


  Taiwan Semiconductor (TSMC) Electronic Components Datasheet  

TS3405 Datasheet

Single Synchronous Buck PWM Controller

No Preview Available !

www.DataSheet4U.com
Pin Descriptions
No. Pin.
1 Boot
2 Ugate
3 Gnd
4 Lgate
5 Vcc
6 FB
7 COMP
et4U.com
8
Phase
Block Diagram
Descriptions
This pin provides ground referenced bias voltage to the upper MOSFET driver. A
bootstrap circuit is used to create a voltage suitable to drive a logic-lever N-channel
MOSFET. It can take 20V as the maximum voltage. It can be powered by a DC power
supply or powered by a boost strap circuit.
This pin provides the PWM controlled gate driver for the upper MOSFET. It is also
monitored by the adaptive shoot-through protection circuitry to determine when the
upper MOSFET can be turned on. The sourcing Rds(on) is 15and the sink Rds(on) is
7. Ugate can handle high voltage up to maximum 20V.
This pin represents the signal and power ground for the IC. Tie this pin to the ground
island/plane through the lowest impedance connection available.
This pin provides the PWM controlled gate drive for the lower MOSFET. This pin is also
monitored by the adaptive shoot-through protection circuitry to determine when the
lower MOSFET can be turned on.
This pin provides the bias supply for the TS3405, as well as the lower MOSFET’s gate.
Connect a well-decoupled 5V supply to this pin.
This pin is the inverting input of the internal error amplifier. Use this pin in combination
with the COMP Pin to compensate the voltage-control feedback loop of the converter.
During soft start and all the time during normal converter operation, this pin represents
the output of the error amplifier. Use this pin in combination with the FB pin to
compensate the voltage control feedback loop of the converter. Pulling COMP to a level
below 0.3V enables soft start process. The whole soft start process takes about 5mS.
This pin is used toDmaotaniStohretheet4vUo.lctaogme drop across the lower MOSFET for over current
protection. The OCP threshold is –30mV. If Phases is less thean –300mV, the upper
MOSFET cannot be turned-on in the next cycle.
DataShee
DataSheet4U.com
TS3405
DataSheet4 U .com
2-10 2003/12 rev. A


Part Number TS3405
Description Single Synchronous Buck PWM Controller
Maker Taiwan Semiconductor Company
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TS3405 Datasheet PDF






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