LM3204_16 datasheet(5/24 Pages) TI1

Nome de Peças	LM3204

Descrição Electrónicos	Miniature, Adjustable, Step-Down DC-DC Converter

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Fabricante Electrônico	TI1 [Texas Instruments]

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LM3204

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SNVS351C – JUNE 2005 – REVISED APRIL 2013

SYSTEM CHARACTERISTICS

The following spec table entries are specified by design if the component values in the typical application circuit are used.

These parameters are not specified by production testing.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

TRESPONSE

Time for VOUT to Rise from

VIN = 4.2V, COUT = 4.7µF,

0.8V to 3.4V in PWM Mode

RLOAD = 15Ω

25

µs

L = 2.2 µH (ISAT > 0.94A)

TSTARTUP

Time for VOUT to rise to 3.4V

VIN = 4.2V, COUT = 4.7µF,

in PWM Mode

RLOAD = 15Ω

50

µs

(1)

L = 2.2µH (ISAT = 0.94A)

EN = Low to High

CCON

VCON Input Capacitance

VCON = 1V,

15

pF

Test frequency = 100kHz

TON_BYP

Bypass FET Turn On Time In

VIN = 3.6V, VCON = 0.267V,

Bypass Mode

COUT = 4.7µF, RLOAD = 15Ω

30

µs

BYP = Low to High

TBYP

Auto Bypass Detect Delay

(2)

10

15

20

µs

Time

(1)

The startup time is the time to reach 90% of 3.4V nominal output voltage from the EN being low to high.

(2)

VIN is compared to the programmed output voltage (VOUT). When VIN–VOUT falls below VBYPASS− for longer than TBYP the Bypass FET

turns on and the switching FETs turn off. This is called the Bypass mode. The device comes out of Bypass mode when VIN–VOUT

exceeds VBYPASS

+ for longer than T

BYP, and PWM mode returns. The hysteresis for the bypass detection threshold VBYPASS

+ –

VBYPASS− will always be positive and will be approximately 200mV (typ.).

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