RT9173CS datasheet(2/10 Pages) RICHTEK

2 / 10 page

RT9173/A

www.richtek-ic.com.tw

DS9173/A-06 March 2002

Pin Description

Pin Name

Pin Function

VIN

Power Input

GND

Ground

VCNTL

Gate Drive Voltage

REFEN

Reference Voltage Input and Chip Enable

VOUT

Output Voltage

Absolute Maximum Ratings

Input Voltage

Power Dissipation

Internally Limited

ESD Rating

2KV

Storage Temperature Range

-65

°C to 150°C

Lead Temperature (Soldering, 5 sec.)

260

°C

Package Thermal Resistance

TO-263,

θJC

7.7

°C/W

TO-263,

θJA

19.4

°C/W

SOP-8,

θJC

15.7

°C/W

SOP-8,

θJA

Note

°C/W

Note:

θJA is measured with the component mounted on an evaluation PC board in free air that the required area of

copper is 300mm

2 or larger.

Electrical Characteristics

(Limits in standard typeface are for TA = 25

°C, unless otherwise specified:

VIN = 2.5V, VCNTL = 3.3V, VREFEN = 1.25V, COUT = 10

µF (Ceramic))

Parameter

Symbol

Test Conditions

Min

Typ

Max Units

Output Offset Voltage

VOS

Fig.1

-20

IL : 0

→ 1.5A, Fig.1

0.8

Load Regulation

∆VLOAD

IL : 0A

→ -1.5A

0.8

VIN

1.8

2.5

Input Voltage Range

(DDR 1)

VCNTL

Keep VCNTL

≥ VIN on operation

power on and power off sequences

3.3

Current In Shutdown Mode

ISHDN

VREFEN

< 0.2V, RL = 180Ω, Fig.2

µA

Short Circuit Protection

RT9173

Fig.3,4

2.1

Current limit

RT9173A

ILIMIT

Fig.3,4

3.0

Over Temperature Protection

Thermal Shutdown Temperature TSD

3.3V

≤ VCNTL ≤ 5V

125

150

°C

Thermal Shutdown Hysteresis

Guaranteed by design

°C

Shutdown Function

Output = High, Fig.5

0.8

Shutdown Threshold Trigger

Output = Low, Fig.5

0.2

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