ltc3858-2 Linear Technology Corporation, ltc3858-2 Datasheet - Page 7

• Manufacturer Part Number: ltc3858-2
• Description: Ltc3858-2 - Low Iq, Dual 2-phase Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
–100
–150
–200
–250
–300
–350
–400
–450
–500
–550
–600
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
356
354
348
344
–50
352
350
346
50
0
–45
–45
5
Soft-Start Pull-Up Current
vs Temperature
SENSE– Pin Input Current
vs Temperature
Oscillator Frequency
vs Input Voltage
FREQ = GND
–20
10
–20
15
5
5
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
V
V
20
OUT
30
OUT
30
= 3.3V
= 28V
25
55
55
30
80
80
105
105
35
38582 G25
38582 G19
38582 G22
130
130
40
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
4.4
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
14
12
10
8
6
4
0
2
–45
–45
5
Shutdown (RUN) Threshold
vs Temperature
Shutdown Input Current
vs Input Voltage
Undervoltage Lockout Threshold
vs Temperature
–20
10
–20
15
5
5
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
20
30
30
25
55
55
30
80
80
105
35
105
38582 G26
38582 G23
38582 G20
130
130
40
5.50
5.25
5.00
4.75
4.50
4.25
4.00
200
808
806
804
802
800
798
796
794
792
800
700
600
500
400
300
100
0
–45
–45
0
Regulated Feedback Voltage
vs Temperature
Oscillator Frequency
vs Temperature
INTV
V
IN
–20
–20
= 12V
CC
20
vs Load Current
5
LOAD CURRENT (mA)
5
TEMPERATURE (°C)
TEMPERATURE (°C)
EXTV
LTC3858-2
FREQ = INTV
FREQ = GND
40
EXTV
30
30
CC
EXTV
= 8.5V
CC
55
55
= 5V
60
CC
CC
= 0V
80
80
80
105
105
38582 G24
38582 G27
38582 G21
38582f
7
130
100
130