Datasheet

LTC3499/LTC3499B
5
3499fc
TEMPERATURE (°C)
–50
FB VOLTAGE (V)
25
75
3499 G09
–25 0 50
1.2215
1.2210
1.2205
1.2200
1.2195
1.2190
1.2185
1.2220
1.2225
100
TEMPERATURE (°C)
–50
0
Burst Mode QUIESCENT CURRENT (µA)
5
10
15
20
30
–25
0 25 50
3499 G08
75 100
25
V
IN
AND SW VOLTAGE (V)
–6
–1.0
REVERSE-BATTERY CURRENT (µA)
0
–2 2–4 0 4
3499 G11
6
–0.5
1.0
0.5
SHDN = 0V
V
OUT
= 0V
V
OUT
50mV/DIV
20µs/DIV
3499 G12
V
IN
= 2.4V
V
OUT
= 5V
L = 4.7µH
C
OUT
= 10µF
C
FF
= 10pF (FEEDFORWARD CAPACITOR FROM
V
OUT
TO FB)
I
L
50mA/DIV
V
OUT
200mV/DIV
200µs/DIV
3499 G13
V
IN
= 2.4V
V
OUT
= 5V
I
LOAD
= 50mA to 200mA
R
Z
= 100k
C
F
= 680pF
C
OUT
= 10µF
L = 4.7µH
I
LOAD
100mA/DIV
200mA
50mA
SW
2V/DIV
200ns/DIV
3499 G14
V
IN
= 2.4V
V
OUT
= 5V
L = 4.7µH
I
L
100mA/DIV
V
IN
2V/DIV
SS
2V/DIV
V
OUT
2V/DIV
1ms/DIV
3499G15
V
IN
= 2.4V
V
OUT
= 5V
L = 4.7µH
C
SS
= 0.01µF
C
OUT
= 10µF
I
L
200mA/DIV
SW
2V/DIV
200ns/DIV
3499 G16
V
IN
= 2.4V
V
OUT
= 5V
L = 4.7µH
I
L
100mA/DIV
Burst Mode Operation
(LTC3499 Only) Load Transient 50mA to 200mA
Fixed Frequency Discontinous
Mode Operation
Soft-Start into 25Ω Load Fixed Frequency Operation
FB Voltage vs Temperature
Burst Mode Quiescent Current
vs Temperature
V
IN
and SW Reverse-Battery
Current vs V
IN
and SW Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C, unless otherwise noted.