LTC3788-1 Linear Technology, LTC3788-1 Datasheet - Page 8

• Manufacturer Part Number: LTC3788-1
• Description: Dual Output Synchronous Boost Controller
• Manufacturer: Linear Technology

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LTC3788-1
TYPICAL PERFORMANCE CHARACTERISTICS
8
360
356
354
352
350
348
346
344
342
340
358
5
Oscillator Frequency
vs Input Voltage
FREQ = GND
10
15
INPUT VOLTAGE (V)
120
260
240
220
200
180
160
140
120
100
100
80
60
40
20
80
60
40
20
0
0
20
0
0
Maximum Current Sense
Threshold vs Duty Cycle
SENSE Pin Input Current
vs I
V
SENSE
10
TH
25
0.5
20
Voltage
= 12V
30
30
1
DUTY CYCLE (%)
I
TH
SENSE
SENSE
40
35
VOLTAGE (V)
1.5
37881 G20
50
+
–
PIN
40
PIN
60
2
70
80
2.5
–60
120
100
–20
–40
80
60
40
20
37881 G25
90
0
37881 G23
0
Maximum Current Sense
Threshold vs I
100
3
0.2
PULSE-SKIPPING MODE
FORCED CONTINUOUS MODE
Burst Mode OPERATION
0.4
I
TH
0.6
VOLTAGE (V)
TH
Voltage
0.8
260
240
220
200
180
160
140
120
100
80
60
40
20
80
70
60
50
40
30
20
10
0
1.0
0
2.5
50
SENSE Pin Input Current
vs V
Charge Pump Charging Current
vs Operating Frequency
V
V
SW
BOOST
1.2
V
150
7.5
SENSE
SENSE
= 12V
37881 G21
OPERATING FREQUENCY (kHz)
– V
1.4
250
12.5
COMMON MODE VOLTAGE (V)
SW
Voltage
= 4.5V
350
SENSE
SENSE
17.5
450 550
260
240
220
200
180
160
140
120
100
+
–
22.5
80
60
40
20
PIN
0
PIN
–45
T = –45°C
T = 130°C
T = 25°C
SENSE Pin Input Current
vs Temperature
V
SENSE
27.5 32.5
–20
650 750
= 12V
5
TEMPERATURE (°C)
37881 G24
37881 G26
37.5
SENSE
SENSE
30
+
–
PIN
55
PIN
80
105
37881 G22
37881f
130