LM3311SQ National Semiconductor Corporation, LM3311SQ Datasheet - Page 16

• Manufacturer Part Number: LM3311SQ
• Description: Step-up Pwm Dc/dc Converter With Integrated Ldo, Op-amp, And Gate Pulse Modulation Switch
• Manufacturer: National Semiconductor Corporation

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V
1) V
2) V
3) I
T = 40µs/div
LDO
1) LV
2) LDO
T = 100µs/div
VGH = 20V, VDPM = 3.3V, C
R2 = 1.2kΩ, VFLK at 50% duty cycle and 30kHz
1) VFLK, 2V/div, DC
3) VGHM, 5V/div, DC
T = 4µs/div
OUT
IN
SHDN
OUT
OUT
, 1A/div, DC
IN
1.28MHz, 8.5V Application Boost Startup Waveform
= 8.5V, V
, 5V/div, DC
OUT
, 5V/div, DC
, 2V/div, DC
= 2.5V, LV
, 1V/div, DC
IN
= 3.3V, C
IN
= 5V, C
GPM Transient Waveforms
(LV
LDO Startup Waveform
OUT
IN
OUT
VGHM
= 20µF, R
Fast Rising Edge)
= 2.2µF, I
= 4.7nF, R
LOAD
LOAD
E
= 20Ω, C
= 2.4kΩ, C
= 300mA
SS
= open
E
20126327
20126354
20126356
= 33pF, R1 = 13kΩ,
16
LDO
2) LDO
3) I
T = 200µs/div
LDO
1) LV
2) LDO
T = 4ms/div
VGH = 20V, VDPM = 3.3V, C
R2 = 1.2kΩ, VFLK at 50% duty cycle and 64kHz
1) VFLK, 2V/div, DC
3) VGHM, 5V/div, DC
T = 2µs/div
LOAD
OUT
OUT
IN
, 5V/div, DC
OUT
OUT
, 100mA/div, DC
= 2.5V, LV
= 2.5V, LV
, 100mV/div, AC
, 1V/div, DC
LDO Load Transient Waveform
IN
IN
= 5V, C
= 5V, C
GPM Transient Waveforms
(LV
LDO Startup Waveform
IN
OUT
OUT
VGHM
Slow Rising Edge)
= 2.2µF
= 2.2µF, I
= 4.7nF, R
LOAD
E
= 750Ω, C
= 300mA
E
20126355
20126308
20126328
= 33pF, R1 = 13kΩ,