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| LTC3708_15 Datasheet, PDF (7/32 Pages) Linear Technology – Fast 2-Phase, No RSENSE Buck Controller with Output Tracking | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3708
On-Time vs EXTLPF Voltage
500
450
400
ION1 = 30μA
350
300
250
200
ION1 = 60μA
150
100
50
0
1
1.1
1.2
1.3
1.4
EXTLPF VOLTAGE (V)
3708 G22
On-Time vs INTLPF Voltage
500
450
400
ION2 = 30μA
350
300
250
200
ION2 = 60μA
150
100
50
0
0.6 0.8
1 1.2 1.4 1.6 1.8 2.0
INTLPF VOLTAGE (V)
3708 G23
2-Phase Operation
IIN
2A/DIV
VIN
200mV/DIV
VSW1
10V/DIV
VSW2
10V/DIV
VIN = 15V
1μs/DIV
VOUT1 = 5V
VOUT2 = 3.3V
IOUT5 = IOUT3 = 2A
Load Transient Response Without
External Synchronization
Load Transient Response with
External Synchronization
IOUT1
10A/DIV
fS = 200kHz
SW1
10V/DIV
fS = 240kHz
IOUT1
10A/DIV
fS = 220kHz
SW1
10V/DIV
fS = 220kHz
VOUT1
50mV/DIV
10μs/DIV
3708 G25
VOUT1
50mV/DIV
10μs/DIV
3708 G26
Discontinuous Mode Operation
Power Good Mask
3708 G024
VOUT
20mV/DIV
VFB
0.2V/DIV
IL
0.5A/DIV
VIN = 15V
VOUT = 5V
VFCB = 5V
IOUT = 20mA
2μs/DIV
3708 G027
PGOOD
2V/DIV
100μs/DIV
3708 G28
3708fb
7
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