LM2694

SNVS444A – MAY 2006 – REVISED APRIL 2013

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Electrical Characteristics

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 ensured 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 = 24V, RON = 200kΩ

(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Start-Up Regulator, VCC

VCCReg

VCC regulated output

6.6

7

7.4

V

ICC = 0 mA,

VIN-VCC dropout voltage

1.3

V

VCC = UVLOVCC + 250 mV

VCC output impedance

0 mA

≤ ICC ≤ 5 mA, VIN = 8V

175

Ω

VCC current limit

(2)

VCC = 0V

9

mA

UVLOVCC

VCC under-voltage lockout

VCC increasing

5.7

V

threshold

UVLOVCC hysteresis

VCC decreasing

150

mV

UVLOVCC filter delay

100 mV overdrive

3

µs

IIN operating current

Non-switching, FB = 3V

0.5

0.8

mA

IIN shutdown current

RON/SD = 0V

90

180

µA

Switch Characteristics

Rds(on)

Buck Switch Rds(on)

ITEST = 200 mA

0.5

1.0

Ω

UVLOGD

Gate Drive UVLO

VBST - VSW Increasing

3.0

4.4

5.5

V

UVLOGD hysteresis

490

mV

Softstart Pin

Pull-up voltage

2.5

V

Internal current source

12

µA

Current Limit

ILIM

Threshold

Current out of ISEN

0.5

0.62

0.74

A

Resistance from ISEN to SGND

180

m

Ω

Response time

150

ns

On Timer

tON - 1

On-time

VIN = 10V, RON = 200 kΩ

2.1

2.8

3.6

µs

tON - 2

On-time

VIN = 30V, RON = 200 kΩ

900

ns

Shutdown threshold

Voltage at RON/SD rising

0.45

0.8

1.2

V

Threshold hysteresis

Voltage at RON/SD falling

35

mV

Off Timer

tOFF

Minimum Off-time

265

ns

Regulation and Over-Voltage Comparators (FB Pin)

VREF

FB regulation threshold

SS pin = steady state

2.440

2.5

2.550

V

FB over-voltage threshold

2.9

V

FB bias current

1

nA

Thermal Shutdown

TSD

Thermal shutdown temperature

175

°C

Thermal shutdown hysteresis

20

°C

Thermal Resistance

θJA

WSON Package

33

Junction to Ambient

°C/W

0 LFPM Air Flow

TSSOP Package

40

θJC

WSON Package

8.8

Junction to Case

°C/W

TSSOP Package

5.2

(1)

Typical specifications represent the most likely parametric norm at 25°C operation.

(2)

VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading

4

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