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| LTC3499_15 Datasheet, PDF (5/16 Pages) Linear Technology – 750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection | |||
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LTC3499/LTC3499B
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
FB Voltage vs Temperature
1.2225
1.2220
1.2215
1.2210
1.2205
1.2200
1.2195
1.2190
1.2185
â50 â25 0
25 50 75 100
TEMPERATURE (°C)
3499 G09
Burst Mode Operation
(LTC3499 Only)
Burst Mode Quiescent Current
vs Temperature
30
25
20
15
10
5
0
â50 â25 0
25 50
TEMPERATURE (°C)
75 100
3499 G08
Load Transient 50mA to 200mA
VIN and SW Reverse-Battery
Current vs VIN and SW Voltage
1.0
SHDN = 0V
VOUT = 0V
0.5
0
â0.5
â1.0
â6
â4 â2 0
2
4
6
VIN AND SW VOLTAGE (V)
3499 G11
Fixed Frequency Discontinous
Mode Operation
VOUT
50mV/DIV
VOUT
200mV/DIV
IL
50mA/DIV
ILOAD 200mA
100mA/DIV
50mA
VIN = 2.4V
VOUT = 5V
L = 4.7µH
20µs/DIV
3499 G12
COUT = 10µF
CFF = 10pF (FEEDFORWARD CAPACITOR FROM
VOUT TO FB)
VIN = 2.4V
200µs/DIV
VOUT = 5V
ILOAD = 50mA to 200mA
RZ = 100k
CF = 680pF
COUT = 10µF
L = 4.7µH
SW
2V/DIV
IL
100mA/DIV
3499 G13
VIN = 2.4V
VOUT = 5V
L = 4.7µH
200ns/DIV
3499 G14
Soft-Start into 25Ω Load
VIN = 2.4V
VOUT = 5V
L = 4.7µH
CSS = 0.01µF
COUT = 10µF
1ms/DIV
VIN
2V/DIV
SS
2V/DIV
VOUT
2V/DIV
IL
200mA/DIV
3499G15
Fixed Frequency Operation
SW
2V/DIV
IL
100mA/DIV
VIN = 2.4V
VOUT = 5V
L = 4.7µH
200ns/DIV
3499 G16
3499fc
5
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