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| LTC3859AL Datasheet, PDF (8/44 Pages) Linear Technology – Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ | |||
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LTC3859AL
Typical Performance Characteristics
Efficiency and Power Loss
vs Output Current (Boost)
100
10000
90
80
1000
70
60
100
50
40
30
20
10
0
0.0001 0.001 0.01
FCM EFFICIENCY
PULSE-SKIPPING 10
EFFICIENCY
BURST LOSS
BURST
EFFICIENCY
1
FCM LOSS
PULSE-SKIPPING
LOSS
0.1
0.1
1
10
OUTPUT CURRENT (A)
FIGURE 12 CIRCUIT
VIN = 5V, VOUT = 10V, VBIAS = VIN
3859al G10
Load Step (Boost)
Burst Mode Operation
Efficiency
vs Output Current (Boost)
100
VIN = 8V
90
VIN = 5V
80
70
60
50
40
30
20 FIGURE 12 CIRCUIT
10 VBIAS = VIN
0 VOUT = 10V
0.0001 0.001 0.01 0.1
1
10
OUTPUT CURRENT (A)
3859al G11
Efficiency vs Input Voltage
(Boost)
100
FIGURE 12 CIRCUIT
99 VBIAS = VIN
98
VOUT = 10V
ILOAD = 2A
97
96
95
94
93
92
91
90
2345678
INPUT VOLTAGE (V)
9 10
3859al G12
Load Step (Boost)
Pulse-Skipping Mode
Load Step (Boost)
Forced Continuous Mode
VOUT
100mV/
DIV
AC-
COUPLED
VOUT
100mV/DIV
AC-COUPLED
VOUT
100mV/DIV
AC-COUPLED
IL
5A/DIV
IL
5A/DIV
IL
5A/DIV
200µs/DIV
VOUT = 10V
VIN = 5V
FIGURE 12 CIRCUIT
3859al G13
200µs/DIV
VOUT = 10V
VIN = 5V
FIGURE 12 CIRCUIT
3859al G14
200µs/DIV
VOUT = 10V
VIN = 5V
FIGURE 12 CIRCUIT
3859al G15
Inductor Current at Light Load
(Boost)
Soft Start-Up (Boost)
FORCED
CONTINUOUS
MODE
Burst Mode
OPERATION
5A/DIV
PULSE-
SKIPPING
MODE
2µs/DIV
VOUT = 10V
VIN = 7V
ILOAD = 1mA
FIGURE 12 CIRCUIT
VOUT3
2V/DIV
RUN3
5V/DIV
GND
3859al G16
5ms/DIV
VIN = 5V
FIGURE 12 CIRCUIT
3859al G17
8
For more information www.linear.com/3859AL
Boost Regulated Feedback
Voltage vs Temperature
1.212
1.209
1.206
1.203
1.200
1.197
1.194
1.191
1.188
â75 â50 â25 0 25 50 75 100 120 150
TEMPERATURE (°C)
3859al G18
3859alf
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