LM3407 datasheet(4/22 Pages) TI1

Part #	LM3407

Description	Constant Current Output Floating Buck Switching Converter for High Power LEDs

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LM3407

SNVS553B – JANUARY 2008 – REVISED MAY 2013

www.ti.com

ELECTRICAL CHARACTERISTICS

VIN = 12V unless otherwise indicated. Typical and limits appearing in plain type apply for TA = TJ = 25°C (Note 4). Limits

appearing in boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are

specified by design, test, or statistical analysis.

Parameter

Test Conditions

Min

Typ

Max

Units

SYSTEM PARAMETERS

IIN

Operating Input Current

4.5V

≤ VIN ≤ 30V

0.58

0.78

0.98

mA

VEN = 5V, VPWM = 5V, LX = open

IQ

Quiescent Input current

4.5V

≤ VIN ≤ 30V

0.20

0.27

0.39

mA

VEN = 5V, VPWM = 0V

ISHUT

Shutdown Input Current

VEN = 0V

36

48

60

µA

VUVLO

Input Under Voltage Lock-out Threshold

VIN Rising

3.6

4.5

V

VUVLO-HYS

UVLO Hysteresis

VIN Falling

200

mV

VEN_H

EN pin HIGH Threshold

VEN Rising

1.9

2.4

V

VEN_L

EN pin LOW Threshold

VEN Falling

1.3

1.75

V

VDIM_H

DIM pin HIGH Threshold

VDIM Rising

1.9

2.4

V

VDIM_L

DIM pin LOW Threshold

VDIM Falling

1.3

1.75

V

fSW

Switching Frequency

RT = 80 kΩ

500

kHz

RT = 40 kΩ

1000

tON-MIN

Minimum On-time

200

ns

TSD

Thermal Shutdown Threshold

165

°C

TSD-HYS

Thermal Shutdown Hysteresis

25

°C

INTERNAL VOLTAGE REGULATOR

VCC

VCC Regulator Output Voltage (1)

VIN = 12V

4.5

V

N-MOSFET DRIVER

RDS(ON)

Main Switch ON Resistance

Isink = 80mA

0.77

1.45

Ω

CONTROL LOOP

AEA

Error Amp Open Loop Gain

60

dB

(1)

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

4

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