LM3481MM datasheet(4/30 Pages) TI1

Teilenummer	LM3481MM

Bauteilbeschribung	LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching Regulators

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LM3481

SNVS346E – NOVEMBER 2007 – REVISED APRIL 2012

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ELECTRICAL CHARACTERISTICS (continued)

VIN=12V, RFA=40 kΩ unless otherwise indicated under the Conditions column. Typicals and limits appearing in plain type

apply for TJ = 25°C. Limits appearing in boldfacetype apply over the full Operating Temperature Range (-40°C to 125°C).

Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

(1) (2)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

RDS1 (ON)

Driver Switch On Resistance (top)

IDR = 0.2A, VIN= 5V

4

Ω

RDS2 (ON)

Driver Switch On Resistance (bottom)

IDR = 0.2A

2

Ω

VIN < 6V

VIN

VDR (max)

Maximum Drive Voltage Swing(3)

V

VIN ≥ 6V

6

Dmax

Maximum Duty Cycle

85

%

tmin (on)

Minimum On Time

250

ns

ISUPPLY

Supply Current (switching)

See (4)

3.7

5.0

mA

VFA/SYNC/SD = 3V

(5), V

IN = 12V

9

15

IQ

Quiescent Current in Shutdown Mode

µA

VFA/SYNC/SD = 3V

(5), V

IN = 5V

5

10

VSENSE

Current Sense Threshold Voltage

100

160

190

mV

VSC

Over Load Current Limit Sense Voltage

157

220

275

mV

VSL

Internal Compensation Ramp Voltage

90

mV

Output Over-voltage Protection (with

VOVP

VCOMP = 1.4V

26

85

135

mV

respect to feedback voltage) (6)

Output Over-Voltage Protection

VOVP(HYS)

VCOMP = 1.4V

28

70

106

mV

Hysteresis

Gm

Error Amplifier Transconductance

VCOMP = 1.4V

216

450

690

µmho

VCOMP = 1.4V

AVOL

Error Amplifier Voltage Gain

35

60

66

V/V

IEAO = 100 µA (Source/Sink)

Source, VCOMP = 1.4V, VFB = 1.1V

475

640

837

µA

Error Amplifier Output Current (Source/

IEAO

Sink)

Sink, VCOMP = 1.4V, VFB = 1.4V

31

65

100

µA

Upper Limit, VFB = 0V, COMP Pin

2.45

2.70

2.93

V

Floating

VEAO

Error Amplifier Output Voltage Swing

Lower Limit, VFB = 1.4V

0.32

0.60

0.90

V

tSS

Internal Soft-Start Delay

VFB = 1.2V, COMP Pin Floating

15

ms

tr

Drive Pin Rise Time

Cgs = 3000 pf, VDR = 0V to 3V

25

ns

tf

Drive Pin Fall Time

Cgs = 3000 pf, VDR = 3V to 0V

25

ns

Output = High (Shutdown)

1.31

1.40

V

Shutdown signal threshold (7)

VSD

FA/SYNC/SD pin

Output = Low (Enable)

0.40

0.68

V

VSD = 5V

−1

ISD

Shutdown Pin Current FA/SYNC/SD pin

µA

VSD = 0V

20

TSD

Thermal Shutdown

165

°C

Tsh

Thermal Shutdown Hysteresis

10

°C

θJA

Thermal Resistance

DGS Package

200

°C/W

(3)

The drive pin voltage, VDR, is equal to the input voltage when input voltage is less than 6V. VDR is equal to 6V when the input voltage is

greater than or equal to 6V.

(4)

For this test, the FA/SYNC/SD Pin is pulled to ground using a 40 k

Ω resistor .

(5)

For this test, the FA/SYNC/SD Pin is pulled to 3V using a 40 k

Ω resistor.

(6)

The over-voltage protection is specified with respect to the feedback voltage. This is because the over-voltage protection tracks the

feedback voltage. The over-voltage threshold can be calculated by adding the feedback voltage (VFB) to the over-voltage protection

specification.

(7)

The FA/SYNC/SD pin should be pulled to VIN through a resistor to turn the regulator off. The voltage on the FA/SYNC/SD pin must be

above the max limit for the Output = High longer than 30 µs to keep the regulator off and must be below the minimum limit for Output =

Low to keep the regulator on.

4

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