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| LTC3129_15 Datasheet, PDF (7/30 Pages) Linear Technology – 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3A Quiescent Current | |||
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LTC3129
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Fixed Frequency Ripple on VOUT
Burst Mode Waveforms
Burst Mode Ripple on VOUT
VOUT
20mV/DIV
IL
200mA/DIV
L = 10µH
VIN = 7V
VOUT = 5V
IOUT = 200mA
COUT = 10µF
200ns/DIV
Start-Up Waveforms
SW1
5V/DIV
SW2
5V/DIV
VOUT
100mV/DIV
IL
200mA/DIV
3129 G22
L = 10µH
VIN = 7V
VOUT = 5V
IOUT = 5mA
COUT = 22µF
50µs/DIV
IL
100mA/DIV
3129 G23
L = 10µH
100µs/DIV
3129 G24
VIN = 7V
VOUT = 5V
IOUT = 5mA
COUT = 22µF (WITH THE RECOMMENDED
FEEDFORWARD CAPACITOR)
Step Load Transient Response in
Fixed Frequency
Step Load Transient Response in
Burst Mode Operation
VOUT
5V/DIV
VCC
5V/DIV
RUN
5V/DIV
IVIN
200mA/DIV
VIN = 7V
VOUT = 5V
IOUT = 50mA
COUT = 22µF
1ms/DIV
VOUT
100mV/DIV
IVOUT
100mA/DIV
3129 G25
L = 10µH
500µs/DIV
VIN = 7V
VOUT = 5V
COUT = 10µF
IOUT = 50mA to 150mA STEP
PGOOD Response to a Drop
On VOUT
VOUT
100mV/DIV
IVOUT
100mA/DIV
3129 G26
L = 10µH
500µs/DIV
3129 G27
VIN = 7V
VOUT = 5V
COUT = 22µF (WITH THE RECOMMENDED
FEEDFORWARD CAPACITOR)
IOUT = 5mA to 125mA STEP
MPPC Response to a Step Load
PGOOD
2V/DIV
VOUT
2V/DIV
VOUT
2V/DIV
VIN
2V/DIV
IVOUT
100mA/DIV
VOUT = 5V
1ms/DIV
3129 G28
2ms/DIV
VIN = 5VOC
VMPPC SET TO 3.5V
CIN = 22µF, RIN = 10Ω,
VOUT = 5V, COUT = 22µF
IOUT = 25mA to 125mA STEP
3129 G29
For more information www.linear.com/LTC3129
3129fb
7
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