LTC1877 Linear Technology, LTC1877 Datasheet - Page 4

• Manufacturer Part Number: LTC1877
• Description: High Efficiency Monolithic Synchronous Step-Down Regulator
• Manufacturer: Linear Technology

LTC1877
4
TYPICAL PERFORMANCE CHARACTERISTICS
605
595
585
575
565
555
545
535
525
515
505
495
1.4
1.2
1.0
0.8
0.6
0.4
0.2
95
90
85
80
75
70
65
60
55
50
0.1
–50
0
Efficiency vs Output Current
Oscillator Frequency vs Supply
Voltage
R
DS(ON)
–25
V
2
IN
= 3.6V
1.0
V
OUTPUT CURRENT (mA)
vs Temperature
V
IN
SUPPLY VOLTAGE (V)
0
IN
TEMPERATURE ( C)
= 3V
4
SYNCHRONOUS SWITCH
MAIN SWITCH
= 5V
V
25
IN
= 7.2V
10
6
50
V
8
IN
75
V
L = 10 H
V
= 10V
100
W
IN
OUT
= 5V
10
100
= 2.5V
1877 • G04
1877 • G07
1877 • G10
U
1000
125
12
0.814
0.809
0.804
0.799
0.794
0.789
0.784
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
2.44
2.43
250
200
150
100
50
0
–50
0
0
Reference Voltage vs
Temperature
Output Voltage vs Load Current
DC Supply Current vs Input
Voltage
V
PULSE SKIPPING MODE
V
L = 10 H
V
OUT
IN
IN
–25
= 4.2V
= 5V
= 1.8V
2
200
LOAD CURRENT (mA)
0
INPUT VOLTAGE (V)
TEMPERATURE ( C)
PULSE SKIPPING MODE
Burst Mode OPERATION
4
25
400
50
6
75
600
8
100
1877 • G08
1877 • G11
1877 • G05
800
125
10
300
250
200
150
100
605
595
585
575
565
555
545
535
525
515
505
495
1.2
1.0
0.8
0.6
0.4
0.2
50
0
0
–50
–50
0
R
Oscillator Frequency vs
Temperature
DC Supply Current vs
Temperature
V
DS(ON)
V
IN
IN
1
–25
= 5V
–25
= 5V
2
BURST MODE OPERATION
PULSE SKIPPING MODE
vs Input Voltage
0
0
3
INPUT VOLTAGE (V)
TEMPERATURE ( C)
TEMPERATURE ( C)
MAIN SWITCH
4
25
25
SWITCH
SYNCHRONOUS
5
50
50
6
75
7
75
8
100
100
1877 • G09
1877 • G06
1877 G19
9
125
125
10