LM3280TLSLASHNOPB datasheet(9/27 Pages) TI

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40 Ps/DIV

200 mA/DIV

3.6V

3.0V

50 mV/DIV

AC Coupled

VIN

VOUT

VOUT = 1.5V

IOUT = 200 mA

20 Ps/DIV

200 mA

250 mA

50 mA

100 mV/DIV

AC Coupled

VIN = 3.6V

VOUT = 1.5V

IOUT

VOUT

100 Ps/DIV

200 mA/DIV

5V/DIV

VSW

VOUT

VIN = 4.2V

1V/DIV

VIN

RLOAD = 15:

VCON = 1.1V

VIN = 3.0V

100 Ps/DIV

200 mA/DIV

5V/DIV

VSW

VOUT

VCON = 0.5V

RLOAD = 15:

BYP

1V/DIV

2V/DIV

ENBUCK

20 Ps/DIV

500 mA/DIV

5V/DIV

1V/DIV

5V/DIV

VOUT

VSW

VIN = 4.2V

VOUT = 3.4V

RLOAD = 15:

100 Ps/DIV

200 mA/DIV

5V/DIV

VSW

VOUT

VIN = 4.2V

VOUT = 3.25V

RLOAD = 15:

2V/DIV

LM3280

www.ti.com

SNOSAU4B – OCTOBER 2006 – REVISED FEBRUARY 2013

Typical Performance Characteristics (continued)

(VIN = ENBUCK = 3.6V, ENLDOx = BYP = 0V, TA = 25°C, unless otherwise noted)

PWM Startup

PWM Shutdown Response

(VCON = 1.13V)

(VCON = 1.08V)

Figure 15.

Figure 16.

Automatic Bypass Operation

Forced Bypass Operation

(VIN = 4.2V to 3.0V)

(VIN = 3.0V)

Figure 17.

Figure 18.

Line Transient Response

Load Transient Response

(VIN = 3.0V to 3.6V)

(VCON = 0.5V)

Figure 19.

Figure 20.

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