LTC3857IUH#PBF Linear Technology, LTC3857IUH#PBF Datasheet - Page 6

• Manufacturer Part Number: LTC3857IUH#PBF
• Description: IC CTRLR STP-DN SYNC DUAL 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3857IUH#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 24 V
• Frequency - Switching: 50kHz ~ 900kHz
• Voltage - Input: 4 ~ 38 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

LTC3857
TYPICAL PERFORMANCE CHARACTERISTICS
6
–20
–40
500
450
400
350
300
250
200
150
100
90
80
70
60
50
40
30
20
10
80
60
50
40
20
0
0
0
0
0
5
Total Input Supply Current
vs Input Voltage
Maximum Current Sense Voltage
vs I
Foldback Current Limit
5% DUTY CYCLE
FORCED CONTINUOUS MODE
0.1
0.2
TH
10
PULSE-SKIPPING MODE
Voltage
0.2
OPERATION
Burst Mode
FEEDBACK VOLTAGE (V)
0.4
15
INPUT VOLTAGE (V)
0.3
0.6
20
NO LOAD
0.4
V
ITH
500μA
300μA
0.5
0.8
(V)
25
V
RUN2 = 0V
FIGURE 13 CIRCUIT
I
OUT1
I
LIM
LIM
I
I
LIM
I
LIM
LIM
0.6
I
LIM
1.0
= INTV
= FLOAT
30
= 3.3V
= GND
= GND
= FLOAT
= INTV
0.7
CC
1.2
35
0.8
3857 G16
3857 G13
3857 G10
CC
1.4
0.9
40
–100
–150
–200
–250
–300
–350
–400
–450
–500
–550
–600
–50
6.0
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
80
75
70
65
60
55
50
45
40
0
–45
–45
0
EXTV
Voltages vs Temperature
SENSE
Quiescent Current vs Temperature
V
–20
–20
SENSE
CC
5
–
Switchover and INTV
Pin Input Bias Current
COMMON MODE VOLTAGE (V)
5
5
TEMPERATURE (°C)
TEMPERATURE (°C)
10
EXTV
EXTV
30
30
INTV
CC
CC
15
55
55
FALLING
RISING
CC
80
20
80
105
105
CC
25
3857 G11
3857 G14
3857 G17
130
130
5.20
5.15
5.00
5.10
5.05
4.95
5.2
5.1
5.0
4.9
4.8
80
40
20
60
0
0
0
0
INTV
Maximum Current Sense
Threshold vs Duty Cycle
INTV
V
IN
10
20 40 60 80 100 120 140
= 12V
5
CC
CC
20
Line Regulation
vs Load Current
10
I
I
LIM
LIM
30
LOAD CURRENT (mA)
I
INPUT VOLTAGE (V)
LIM
DUTY CYCLE (%)
15
= INTV
= FLOAT
= GND
40 50
EXTV
EXTV
20
CC
CC
CC
60
= 8.5V
25
= 0V
70
30
160
80
35
180 200
3857 G12
90
3857 G15
3857 G18
3857fc
100
40