LM34922

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SNVS813A – JUNE 2012 – REVISED MARCH 2013

Absolute Maximum Ratings

(1) (2) (3)

VIN to SGND (TJ = 25°C)

30V

BST to SGND

37V

SW to SGND (Steady State)

-1.5V to 30V

BST to SW

-0.3V to 7V

CS to CSG

-0.3V to 0.3V

CSG to SGND

-0.3V to 0.3V

PGD to SGND

-0.3V to 7V

SS to SGND

-0.3V to 3V

RT to SGND

-0.3V to 1V

FB to SGND

-0.3V to 7V

ESD Rating (4)

Human Body Model

2kV

Storage Temperature Range

-65°C to +150°C

For soldering specs see: SNOA549C

Junction Temperature

150°C

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.

(2)

If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and

specifications.

(3)

Current flow out of a pin is indicated as a negative number.

(4)

The human body model is a 100pF capacitor discharged through a 1.5k

Ω resistor into each pin.

Operating Ratings

(1)

VIN Voltage

6.0V to 28V

Junction Temperature

–40°C to +125°C

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.

Electrical Charateristics

Specifications with standard type are for TJ = 25°C only; limits in boldface type apply over the full Operating Junction

Temperature (TJ) range. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical

values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless

otherwise stated the following conditions apply: VIN = 12V, RT = 50kΩ.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Input (VIN Pin)

IIN

Input operating current

Non-switching, FB = 3V

1200

1600

µA

UVLOVIN

VIN under-voltage lock-out threshold

VIN Increasing

4.6

5.3

5.9

V

VIN under-voltage lock-out threshold

200

mV

hysteresis

Switch Characteristics

RDS(ON)

Buck Switch RDS(ON)

ITEST = 200mA

0.3

0.6

Ω

UVLOGD

Gate Drive UVLO

BST-SW

2.4

3.4

4.4

V

UVLOGD Hysteresis

350

mV

Pre-charge switch voltage

ITEST = 10mA into SW pin

1.4

V

Pre-charge switch on-time

120

ns

Soft-Start Pin

VSS

Pull-up voltage

2.51

V

ISS

Internal current source

10

µA

VSS-SH

Shutdown Threshold

70

140

mV

Current Limit

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