LM3554_14 datasheet(10/43 Pages) TI1

Teilenummer	LM3554

Bauteilbeschribung	Synchronous Boost Converter with 1.2A Dual High Side LED Drivers and I2C Compatible

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Hersteller	TI1 [Texas Instruments]

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LM3554

SNVS549A – JUNE 2009 – REVISED APRIL 2011

www.ti.com

Typical Performance Characteristics (continued)

VIN = 3.6V, LEDs are Lumiled PWF-4, COUT = 10µF, CIN = 4.7µF, L = FDSE0312-2R2 (2.2µH, RL = 0.15Ω), TA = +25°C unless

otherwise specified.

Shutdown Current

Switching Frequency

vs

VIN

(VHWEN = 0V)

Active (Non-Switching) Supply Current

Active (Switching) Supply Current

vs

VIN

(VLED = 1.5V)

(VOUT = 5V, IOUT = 400mA)

Closed Loop Current Limit

vs

VIN

(Flash Duration Register bits [6:5] = 00, (2))

(Flash Duration Register bits [6:5] = 01, (2) )

(2)

The typical curve for Over-Voltage Protection (OVP) is measured in closed loop using the typical application circuit . The OVP value is

found by forcing an open circuit in the LED1 and LED2 path and recording the peak value of VOUT. The value given in the Electrical

Table is found in an open loop configuration by ramping the voltage at OUT until the OVP comparator trips. The closed loop data can

appear higher due to the stored energy in the inductor being dumped into the output capacitor after the OVP comparator trips. At worst

case is an open circuit condition where the output voltage can continue to rise after the OVP comparator trips by approximately

IIN×sqrt(L/COUT).

10

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