Datasheet

5
LT1317/LT1317B
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (µA)
26
25
24
23
22
21
20
–25 0 25 50
1317 TPC10
75 100
TEMPERATURE (°C)
–50 –25 0 25 50 75 100
FB PIN BIAS CURRENT (nA)
1317 TPC11
40
36
32
28
24
20
16
12
8
4
0
Quiescent Current, SHDN = 0V FB Pin Bias Current
SHDN Pin Current
LOAD CURRENT (mA)
1
EFFICIENCY (%)
90

80

70

60

50

40
10 100 1000
1317 TPC14
V
IN
= 3V
V
IN
= 2.2V
V
IN
= 1.65V
LOAD CURRENT (mA)
1
EFFICIENCY (%)
90

80

70

60

50

40
10 100 1000
1317 TPC15
V
IN
= 3V
V
IN
= 2.2V
V
IN
= 1.65V
LOAD CURRENT (mA)
EFFICIENCY (%)
90

80

70

60

50
10 100 1000
1317 TPC13
10.3
V
IN
= 3V
V
IN
= 2.2V
V
IN
= 1.65V
5V Output Efficiency, Circuit of
Figure 1 (LT1317)
2-Cell to 3.3V Converter
Efficiency (LT1317B)
2-Cell to 5V Converter Efficiency
(LT1317B)
Burst Mode Operation (LT1317)
V
OUT
50mV/DIV
AC COUPLED
I
L
200mA/DIV
V
SW
5V/DIV
V
IN
= 2V 20µs/DIV 1317 TPC18
V
OUT
= 3.3V
I
LOAD
= 30mA
CIRCUIT OF FIGURE 1
Transient Response (LT1317B)
V
OUT
100mV/DIV
AC COUPLED
I
L
200mA/DIV
V
IN
= 2V 1ms/DIV 1317 TPC17
V
OUT
= 3.3V
CIRCUIT OF FIGURE 1
WITH LT1317B
Transient Response (LT1317)
V
OUT
100mV/DIV
AC COUPLED
I
L
200mA/DIV
V
IN
= 2V 1ms/DIV 1317 TPC16
V
OUT
= 3.3V
CIRCUIT OF FIGURE 1
I
LOAD
165mA
5mA
I
LOAD
165mA
5mA
SHDN PIN VOLTAGE (V)
0
SHDN PIN CURRENT (µA)
3
5
1317 TPC12
12 4
2
1
0
–1
–2
–3
6