LTC3261_15 Datasheet, PDF (4/14 Pages) Linear Technology – High Voltage, Low Quiescent Current Inverting Charge Pump

LTC3261
Typical Performance Characteristics
(T_A = 25°C, C_FLY = 1µF, C_IN = C_OUT = 10µF unless otherwise noted)
Oscillator Frequency
vs Supply Voltage
600
Oscillator Frequency vs RT
600
RT = GND
500
500
400
400
300
300
RT = 200kΩ
200
200
100
100
0
0 5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
3261 G01
Quiescent Current vs Temperature
(Burst Mode Operation)
140
RT = GND
120
100
V_IN = 32V
80
V_IN = 12V
60
V_IN = 5V
40
20
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3261 G04
0
1
10
100
1000
RT (kΩ)
Quiescent Current
vs Supply Voltage
(Constant Frequency Mode)
14
f_OSC = 500kHz
12
f_OSC = 200kHz
f_OSC = 50kHz
10
10000
3261 G02
8
6
4
2
0
0 5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
3261 G05
Effective Open-Loop Resistance
vs Temperature
60
V_IN = 32V
55
V_IN = 25V
V_IN = 12V
f_OSC = 500kHz
50
45
40
35
30
25
20
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3261 G07
V_OUT Short-Circuit Current
vs Supply Voltage
250
200
f_OSC = 500kHz
150
100
f_OSC = 200kHz
50
0
0 5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
3261 G08
4
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Shutdown Current vs Temperature
25
V_IN = 32V
V_IN = 12V
20
V_IN = 5V
15
10
5
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3261 G03
Quiescent Current vs Temperature
(Constant Frequency Mode)
9
V_IN = 12V
8
7
6
f_OSC = 500kHz
f_OSC = 200kHz
5
f_OSC = 50kHz
4
3
2
1
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3261 G06
V_OUT Short Circuit Current
vs Temperature
200
V_IN = 12V
RT = GND
180
160
140
120
100
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3261 G8b
3261fb