LTC1877 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1877' PDF : 16 Pages View PDF
LTC1877
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current
95
90
VIN = 3.6V
85
VIN = 10V
80
VIN = 7.2V
75
VIN = 5V
70
65
60
55
50
0.1
L = 10µH
VOUT = 2.5V
1.0
10
100
OUTPUT CURRENT (mA)
1000
1877 • G04
Oscillator Frequency vs Supply
Voltage
605
595
585
575
565
555
545
535
525
515
505
495
0
24
6
8
10 12
SUPPLY VOLTAGE (V)
1877 • G07
RDS(ON) vs Temperature
1.4
1.2
1.0
VIN = 3V
0.8
0.6
VIN = 5V
0.4
0.2
–50 –25
SYNCHRONOUS SWITCH
MAIN SWITCH
0 25 50 75
TEMPERATURE (°C)
100 125
1877 • G10
Reference Voltage vs
Temperature
0.814
VIN = 5V
0.809
0.804
0.799
0.794
0.789
0.784
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1877 • G05
Output Voltage vs Load Current
2.53
PULSE SKIPPING MODE
2.52 VIN = 4.2V
2.51 L = 10µH
2.50
2.49
2.48
2.47
2.46
2.45
2.44
2.43
0
200
400
600
800
LOAD CURRENT (mA)
1877 • G08
DC Supply Current vs Input
Voltage
250
PULSE SKIPPING MODE
200
VOUT = 1.8V
150
100
50
Burst Mode OPERATION
0
0
2
4
6
8
10
INPUT VOLTAGE (V)
1877 • G11
Oscillator Frequency vs
Temperature
605
595 VIN = 5V
585
575
565
555
545
535
525
515
505
495
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
1877 • G06
RDS(ON) vs Input Voltage
1.2
1.0
SYNCHRONOUS
0.8
SWITCH
0.6
MAIN SWITCH
0.4
0.2
0
0 12
3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
1877 • G09
DC Supply Current vs
Temperature
300
VIN = 5V
250
PULSE SKIPPING MODE
200
150
100
50
BURST MODE OPERATION
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
1877 G19
4
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