LM3477

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SNVS141K – OCTOBER 2000 – REVISED MARCH 2013

Absolute Maximum Ratings

(1) (2)

Input Voltage

36V

Peak Driver Output Current (<10µs)

1.0A

CB Pin Voltage (3)

43V

ISEN Pin Voltage

500mV

Power Dissipation

Internally Limited

Storage Temperature Range

−65°C to +150°C

Junction Temperature

+150°C

ESD Susceptibilty (4)

Human Body Model

2kV

Machine Model

200V

Lead Temperature for VSSOP Package

Vapor Phase (60 sec.)

215°C

Infared (15 sec.)

220°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 ensured specifications and test conditions, see the Electrical Characteristics.

(2)

If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.

(3)

The CB pin must not be higher than 8V above the VSW.

(4)

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

Ω resistor into each pin. The machine model is 200 pF capacitor

discharged directly into each pin.

Operating Ratings

(1)

Supply Voltage

2.97V

≤ VIN ≤ 35V

Junction Temperature Range

−40°C ≤ TJ ≤ +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 ensured specifications and test conditions, see the Electrical Characteristics.

Electrical Characteristics

(1)

Specifications in Standard type face are for TJ = 25°C, and in bold type face apply over the full Operating Temperature

Range. Unless otherwise specified, VIN = 12V.

Symbol

Parameter

Conditions

Typical

Limit

Units

VFB

Feedback Voltage

VCOMP = 1.4V,

1.270

V

2.97V

≤ VIN ≤ 36V

1.260/1.252

V(min)

1.288/1.290

V(max)

ΔVLINE

Feedback Voltage Line Regulation

2.97V

≤ VIN ≤ 36V

0.001

%/V

ΔVLOAD

Output Voltage Load Regulation

±0.5

%/V (max)

VUVLO

Input Undervoltage Lock-out

2.87

V

2.97

V(max)

VUV(HYS)

Input Undervoltage Lock-out Hysteresis

180

mV

130

mV (min)

225

mV (max)

FSW

Switching Frequency

500

kHz

435

kHz(min)

575

kHz(max)

RDS1 (ON)

Driver Switch On Resistance (top)

IDR = 0.2A, VIN= 5V

7

Ω

RDS2 (ON)

Driver Switch On Resistance (bottom)

IDR = 0.2A

4

Ω

(VCB−VSW)max

Maximum Boot Voltage

VIN < 7.2V

VIN

V

VIN ≥ 7.2V

7.2

Dmax

Maximum Duty Cycle

93

%

88

%(min)

Tmin (on)

Minimum On Time

330

nsec

230

nsec(min)

495

nsec(max)

(1)

All limits are ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature

limits are 100% tested. All limits at temperature extremes are ensured via correlation using standard Statistical Quality Control (SQC)

methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

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