TS3552 datasheet(2/11 Pages) TSC

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TS3552

2A/350kHz Synchronous Buck DC/DC Converter

2/11

Version: B11

Absolute Maximum Rating

Characteristics

Symbol

Rating

Unit

Maximum Supply Voltage

VIN

-0.3 ~ +24

Switching Pin Input Voltage

VSW

-1 ~ (VIN +0.3)

Boost Voltage

VBS

(VSW -0.3) ~ (VSW +6)

All Other Pins

-0.3 to +6

Output Voltage

VOUT

0.925 ~ 20

Power Dissipation

Internal Limited

Operating Temperature Range

TOPR

-40 to +85

ºC

Storage Temperature Range

TST

-65 to +150

ºC

Operating Junction Temperature Range

+150

ºC

Thermal Resistance Junction to case

θJC

ºC/W

Thermal Resistance Junction to ambient

θJA

120

ºC/W

Note: Stresses exceed those rating may damage the device

Note: θJA is measured with the PCB copper area of approximately 1 in

2 (multi-layer)

Electrical Specifications (TA=25

oC, V

IN=12V unless otherwise noted)

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Operating Voltage

VIN

4.75

Shutdown Supply Current

ISD

VEN =0V

µA

Feedback Voltage

VFB

4.75V ≤ VIN ≤ 23V

0.9

0.925

0.95

Load Regulation

REGLOAD

-2

High-Side MOSFET On-Resistance

RDSON

130

Low-Side MOSFET On-Resistance

RDSON

130

High-Side MOSFET Leakage Current

IL(HIGH-SIDE)

VEN = 0V, VSW = 0V

µA

High-Side MOSFET Current Limit

ILIMIT

Minimum Duty

2.4

3.4

Oscillator Frequency

FOSC

280

350

430

KHz

Short Circuit Oscillator Frequency

FSC

VFB =0V

KHz

Maximum Duty Cycle

VFB =0.8V

Soft-Start Current

ISS

VSS=0V

µA

Soft-Start Period

CSS=0.1µF

EN Shutdown Threshold Voltage

VENSD

VEN Rising

1.1

1.5

2.0

Thermal Shutdown

OTP

160

°C

Thermal Shutdown Hysteresis

OTPHYSTERSIS

°C

Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operat ing

temperature range are assured by design, characterization and correlation with Statistical Quality Controls

(SQC).

Note 2: It is recommended to use duty ratio above 10% for minimizing resultant duty cycle jitter.

Note 3: It is recommended to connect a soft start capacitor to soft start pin. Leave the soft start pin open may

cause large inrush current and output overshooting

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