RT9173B datasheet(5/13 Pages) RICHTEK

5 / 13 page

RT9173B

DS9173B-09 March 2007

www.richtek.com

Electrical Characteristics

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

μF (Ceramic), TA = 25°C unless otherwise specified)

Absolute Maximum Ratings (Note 1)

Input Voltage ------------------------------------------------------------------------------------------------------------ 7V

Power Dissipation, PD @ TA = 25

°C

SOP-8 -------------------------------------------------------------------------------------------------------------------- 0.625W

TO-252 ------------------------------------------------------------------------------------------------------------------- 1.471W

Package Thermal Resistance (Note 5)

SOP-8,

θJA -------------------------------------------------------------------------------------------------------------- 160°C/W

SOP-8,

θJC -------------------------------------------------------------------------------------------------------------- 23°C/W

TO-252,

θJA ------------------------------------------------------------------------------------------------------------- 68°C/W

TO-252,

θJC ------------------------------------------------------------------------------------------------------------- 8°C/W

Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260

°C

Junction Temperature ------------------------------------------------------------------------------------------------ 150

°C

Storage Temperature Range ---------------------------------------------------------------------------------------- –65

°C to 150°C

ESD Susceptibility (Note 2)

HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV

MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V

Recommended Operating Conditions

(Note 3)

Junction Temperature Range ---------------------------------------------------------------------------------------- –40°C to 125°C

Parameter

Symbol

Test Conditions

Min

Typ

Max Units

Output Offset Voltage

VOS

IOUT = 0A, Figure 1 (Note 4)

−20

IL : 0A → 2A, Figure 1

Load Regulation

ΔVLOAD

IL : 0A → -2A

−20

VIN

1.7

2.5/1.8

Input Voltage Range (DDR I/II)

VCNTL

Keep VCNTL ≥ VIN on operation power

on and power off sequences

3.3/5

Operating Current of VCNTL

ICNTL

No Load

2.5

Current In Shutdown Mode

ISHDN

VREFEN < 0.2V, RL = 180Ω, Figure 2

μA

Short Circuit Protection

Current limit

ILIM

Figure 3,4

2.2

2.6

Over Temperature Protection

Thermal Shutdown Temperature TSD

3.3V

≤ VCNTL ≤ 5V

125

170

°C

Thermal Shutdown Hysteresis

ΔTSD

3.3V

≤ VCNTL ≤ 5V

°C

Shutdown Function

Output = High, Figure 5

0.6

Shutdown Threshold Trigger

Output = Low, Figure 5

0.2

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