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| LTC3859AL Datasheet, PDF (7/44 Pages) Linear Technology – Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ | |||
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Typical Performance Characteristics
LTC3859AL
Efficiency and Power Loss
vs Output Current (Buck)
100
10000
90
80
1000
70
60
100
50
40
30
20
10
0
0.0001 0.001 0.01
FCM EFFICIENCY 10
PULSE-SKIPPING
EFFICIENCY
BURST LOSS
BURST EFFICIENCY 1
FCM LOSS
PULSE-SKIPPING
LOSS
0.1
0.1
1
10
OUTPUT CURRENT (A)
FIGURE 12 CIRCUIT
VIN = 10V, VOUT = 5V
3859al G01
Load Step (Buck)
Burst Mode Operation
Efficiency
vs Output Current (Buck)
100
90
VIN = 10V
80
VIN = 20V
70
60
50
40
30
20
10 FIGURE 12 CIRCUIT
VOUT = 5V
0
0.0001 0.001 0.01 0.1
1
10
OUTPUT CURRENT (A)
3859al G02
Load Step (Buck)
Pulse-Skipping Mode
Efficiency vs Input Voltage (Buck)
100
FIGURE 12 CIRCUIT
99 VOUT = 5V
ILOAD = 4A
98
97
96
95
94
93
92
0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3859al G03
Load Step (Buck)
Forced Continuous Mode
VOUT
100mV/DIV
AC-COUPLED
VOUT
100mV/DIV
AC-COUPLED
VOUT
100mV/DIV
AC-COUPLED
IL
2A//DIV
50µs/DIV
VIN = 12V
VOUT = 5V
FIGURE 12 CIRCUIT
3859al G04
IL
2A//DIV
50µs/DIV
VIN = 12V
VOUT = 5V
FIGURE 12 CIRCUIT
3859al G05
IL
2A//DIV
50µs/DIV
VIN = 12V
VOUT = 5V
FIGURE 12 CIRCUIT
3859al G06
Inductor Current at Light Load
(Buck)
Soft Start-Up (Buck)
FORCED
CONTINUOUS
MODE
Burst Mode
OPERATION
1A/DIV
PULSE-
SKIPPING
MODE
2µs/DIV
VIN = 10V
VOUT = 5V
ILOAD = 1mA
FIGURE 12 CIRCUIT
3859al G07
5ms/DIV
VIN = 12V
FIGURE 12 CIRCUIT
VOUT2
2V/DIV
VOUT1
2V/DIV
RUN1/
RUN2
5V/DIV
3859al G08
For more information www.linear.com/3859AL
Buck Regulated Feedback Voltage
vs Temperature
808
806
804
802
800
798
796
794
792
â75 â50 â25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3859al G09
3859alf
7
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