LM3248 datasheet(13/32 Pages) TI2

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VCON

IOUT

1V/DIV

500mV/DIV

200mA/DIV

20µS/DIV

TRISE = 6.8µS

TFALL = 6.2µS

VOUT

IOUT

10mV/DIV

20mA/DIV

20µS/DIV

VOUT_AC

ENA

1V/DIV

2V/DIV

500mV/DIV

BOOST_GATE

20µS/DIV

2V/DIV

VCON

VOUT

VBUCK_OUT

VCON

IOUT

1V/DIV

500mV/DIV

50mA/DIV

20µS/DIV

TRISE = 7.8µS

TFALL = 7.6µS

40µS/DIV

1A/DIV

2V/DIV

SW_BUCK

VOUT

IL (Buck)

ENA

1V/DIV

2V/DIV

500mV/DIV

BOOST_GATE

2V/DIV

VCON

VOUT

20µS/DIV

LM3248

www.ti.com

SNVSA01A – JULY 2013 – REVISED SEPTEMBER 2013

TYPICAL CHARACTERISTICS (continued)

For all Efficiency vs Load Current graphs, L1=1276AS-H-1R0N, L3=1285AS-H-1R5N.

Startup in Auto-Boost Mode

VBATT=2.7V, Load=200 mA, MODE=2G, VOUT=0.4↔4V,

Timed Output Current Limit into Short Circuit

TR=TF=10µS

VBATT=4.3V, VOUT=2.5V, Load=6.8Ω/Short to GND

Figure 21.

Figure 22.

VCON Transient Response

VCON Transient with Boost Active

VBATT=3.8V, VOUT= 0.8V↔3.3V, MODE=LOW

VBATT=3.2V, MODE=2G, VOUT= 0.4↔4 V, Load=11.4Ω

BOOST_GATE=LOW, Load=20

Ω, TR=TF=10µS

Figure 23.

Figure 24.

VCON Transient Response

VBATT=3.8V, VOUT= 1.4V↔3.4V, MODE=LOW

VBATT=3.8V, VOUT=1.0V, MODE=LOW

BOOST_GATE=LOW, Load=6.8

Ω, TR=TF=10µS

BOOST_GATE=LOW, Load=0A

↔60mA, TR=TF=10µS

Figure 25.

Figure 26.

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