Linear Technology LTC1736, Datasheet

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4
LTC1736
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Efficiency vs Load Current
(3 Operating Modes)
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
60
70
80
BURST
SYNC
CONT
10
1736 G01
50
40
20
0.01
0.1
1
30
100
90
V
IN
= 5V
V
OUT
= 1.6V
R
S
= 0.01
Ω
f
O
= 300kHz
EXTV
CC
OPEN
LOAD CURRENT (A)
10mA 100mA 1A 10A
EFFICIENCY (%)
1736 G02
100
90
80
70
60
50
40
V
IN
= 5V
EXTV
CC
= 5V
V
IN
= 24V
V
IN
= 15V
INPUT VOLTAGE (V)
0
70
EFFICIENCY (%)
75
80
85
90
100
5
10 15 20
1736 G03
25 30
95
EXTV
CC
= 5V
V
OUT
= 1.6V
FIGURE 1
I
OUT
= 5A
I
OUT
= 0.5A
Efficiency vs Load Current Efficiency vs Input Voltage
Efficiency vs Input Voltage
INPUT VOLTAGE (V)
0
70
EFFICIENCY (%)
75
80
85
90
100
5 10 15 20
1736 G04
25 30
95
EXTV
CC
OPEN
V
OUT
= 1.6V
FIGURE 1
I
OUT
= 5A
I
OUT
= 0.5A
LOAD CURRENT (A)
0
NORMALIZED V
OUT
(%)
–0.2
–0.1
8
1736 G05
–0.3
–0.4
2 4 6 12 10
0
FCB = 0V
V
IN
= 15V
FIGURE 1
Load Regulation
LOAD CURRENT (A)
0
0
I
TH
VOLTAGE (V)
0.5
1.0
1.5
2.0
2.5
1
2 3 4
1736 G06
5 6
V
IN
= 5V
V
OUT
= 1.6V
R
SENSE
= 0.01
Ω
f
O
= 300kHz
CONTINUOUS
MODE
Burst Mode
OPERATION
SYNCHRONIZED f = f
O
I
TH
Voltage vs Load Current
Input and Shutdown Currents
vs Input Voltage
INPUT VOLTAGE (V)
0 5
0
INPUT CURRENT (
µ
A)
SHUTDOWN CURRENT (
µ
A)
200
500
10 20 25
1736 G07
100
400
300
0
40
100
20
80
60
15 30 35
EXTV
CC
OPEN
SHUTDOWN
EXTV
CC
= 5V
ALL VID BITS OPEN
INTV
CC
Line Regulation
INPUT VOLTAGE (V)
0
INTV
CC
VOLTAGE (V)
4
5
6
15 25
1736 G08
3
2
5 10
20 30 35
1
0
1mA LOAD
EXTV
CC
Switch Drop
vs INTV
CC
Load Current
INTV
CC
LOAD CURRENT (mA)
0
EXTV
CC
– INTV
CC
(mV)
300
400
500
40
1736 G09
200
100
0
10
20
30
50