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LTC3878IGN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC3878
4
3878fa
Typical perForMance characTerisTics
Transient Response FCM
(Forced Continuous Mode)
Transient Response FCM
Positive Load Step
Transient Response FCM
Negative Load Step
Transient Response DCM
(Discontinuous Mode)
Normal Start-Up, RUN/SS
Release from Zero
Start-Up V
IN
Cycled Low and High
Efficiency vs Load Current Efficiency vs Input Voltage Frequency vs Input Voltage
V
IN
(V)
4
50
EFFICIENCY (%)
60
70
80
8
12
16 20
3878 G08
24
90
100
55
65
75
85
95
28
1A CCM
15A CCM
1A DCM
V
OUT
= 1.2V
SW FREQ = 400kHz
FIGURE 7 CIRCUIT
V
IN
(V)
4
300
FREQUENCY (kHz)
320
340
360
380
420
8
12 16 20
3878 G09
24 28
0A
15A
400
310
330
350
370
410
390
V
OUT
= 1.2V
FIGURE 7 CIRCUIT
V
OUT
(AC)
50mV/DIV
I
L
10A/DIV
I
LOAD
10A/DIV
50µs/DIV
LOAD STEP 0A TO 10A TO 0A
V
IN
= 12V
V
OUT
= 1.2V
FCB = 0V
SW FREQ = 400kHz
FIGURE 7 CIRCUIT
3878 G01
V
OUT
(AC)
50mV/DIV
V
SW
20V/DIV
I
L
10A/DIV
I
LOAD
10A/DIV
5µs/DIV
LOAD STEP 0A TO 10A
V
IN
= 12V
V
OUT
= 1.2V
FCB = 0V
SW FREQ = 400kHz
FIGURE 7 CIRCUIT
3878 G02
V
OUT
(AC)
50mV/DIV
V
SW
20V/DIV
I
L
10A/DIV
I
LOAD
10A/DIV
5µs/DIV
LOAD STEP 10A TO 0A
V
IN
= 12V
V
OUT
= 1.2V
FCB = 0V
SW FREQ = 400kHz
FIGURE 7 CIRCUIT
3878 G03
V
OUT
(AC)
50mV/DIV
I
L
10A/DIV
I
LOAD
10A/DIV
50µs/DIV
LOAD STEP 1A TO 11A TO 1A
V
IN
= 12V
V
OUT
= 1.2V
FCB = INTV
CC
SW FREQ = 400kHz
FIGURE 7 CIRCUIT
3878 G04
V
OUT
500mV/DIV
I
L
10A/DIV
RUN/SS
2V/DIV
50ms/DIV
V
IN
= 12V
V
OUT
= 1.2V
FCB = 0V
SW FREQ = 400kHz
FIGURE 7 CIRCUIT
3878 G05
V
OUT
1V/DIV
V
IN
10V/DIV
I
L
10A/DIV
RUN/SS
5V/DIV
100ms/DIV
V
IN
= 12V
V
OUT
= 1.2V
FCB = 0V
SW FREQ = 400kHz
FIGURE 7 CIRCUIT
3878 G06
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.01 1 10 100
3878 G07
0
0.1
CONTINUOUS
MODE
DISCONTINUOUS
MODE
V
IN
= 12V
V
OUT
= 1.2V
SW FREQ = 400kHz
FIGURE 7 CIRCUIT
LTC3878
5
3878fa
Typical perForMance characTerisTics
Frequency vs Load Current Load Regulation FCM I
TH
Voltage vs Load Current
Current Sense Voltage
vs I
TH
Voltage
On-Time vs I
ON
Current Current Limit Foldback
Maximum V
DS
Current Sense
Threshold vs V
RNG
Voltage
Maximum V
DS
Current Sense
Threshold vs RUN/SS Voltage
Feedback Reference Voltage vs
Temperature
I
ON
CURRENT (µA)
1
10
ON-TIME (ns)
100
1000
10000
10 100
3878 G14
FIGURE 7 CIRCUIT
V
FB
(V)
0
80
100
140
0.6
3878 G15
60
40
0.2 0.4 0.8
20
0
120
MAXIMUM CURRENT SENSE THRESHOLD (mV)
V
RNG
= 1V
FIGURE 7 CIRCUIT
V
RNG
VOLTAGE (V)
0.2
0
MAXIMUM CURRENT SENSE THRESOLD (mV)
50
150
200
250
0.6
1.0
1.2 2.0
3878 G16
100
0.4 0.8
1.4
1.6
1.8
300
RUN/SS VOLTAGE (V)
1.5
140
120
100
80
60
40
20
0
3878 G17
2.0
2.5 3.0
MAXIMUM CURRENT SENSE THRESHOLD (mV)
TEMPERATURE (°C)
–50
FEEDBACK REFERENCE VOLTAGE (V)
0.800
0.802
0.804
110
3878 G18
0.798
0.796
0.792
–10
30
70
–30
10
50
90
0.794
0.808
0.806
I
LOAD
(A)
0
FREQUENCY (kHz)
250
330
410
2 4 6 8
3878 G10
170
90
210
290
370
130
50
10
10 12
14
CONTINUOUS MODE
DISCONTINUOUS MODE
V
IN
= 15V
V
OUT
= 1.2V
FIGURE 7 CIRCUIT
LOAD CURRENT (A)
0
$V
OUT
(%)
–0.10
–0.08
–0.06
3878 G11
–0.12
–0.14
–0.16
5 10
–0.04
–0.02
0
15
V
IN
= 15V
V
OUT
= 1.2V
FIGURE 7 CIRCUIT
I
TH
VOLTAGE (V)
0
–150
CURRENT SENSE THRESHOLD (mV)
–100
0
50
100
1
2
2.5
300
3878 G13
–50
0.5 1.5
150
200
250
V
RNG
= 0.2V
V
RNG
= 0.5V
V
RNG
= 1.0V
V
RNG
= 1.5V
V
RNG
= 2.0V
LTC3878
6
3878fa
Typical perForMance characTerisTics
Error Amplifier g
m
vs Temperature
Shutdown Current
vs Input Voltage
Quiescent Current vs INTV
CC
INTV
CC
Load Regulation INTV
CC
Dropout INTV
CC
vs INTV
CC
I
LOAD
Efficiency: LTC3878 vs LTC1778
RUN/SS Pin Current vs
Temperature
INPUT VOLTAGE (V)
5 10
10
INPUT CURRENT (µA)
20
35
15
25
30
3878 G20
15
30
25
20
35
40
INTV
CC
LOAD CURRENT (mA)
0
$INTV
CC
(%)
–0.8
–0.4
0
40
3878 G22
–1.2
–1.6
–1.0
–0.6
–0.2
–1.4
–1.8
–2.0
10
20
30
50
V
IN
= 12V
INTV
CC
LOAD CURRENT (mA)
0
–1200
INTV
CC
DROPOUT VOLTAGE (mV)
–1000
–800
–600
–400
–200
0
10 20 30 40
3878 G23
50
V
IN
= 4.5V
TEMPERATURE (°C)
–50
1.0
g
m
(mS)
1.1
1.3
1.4
1.5
2.0
1.7
0
50
3878 G19
1.2
1.8
1.9
1.6
100
INTV
CC
(V)
4.0
QUIESCENT CURRENT (mA)
1.5
2.0
2.5
5.5
6.5
3878 G21
1.0
0.5
0
4.5 5.0 6.0
3.0
3.5
4.0
7.0
I
LOAD
(mA)
0
1
0
INTV
CC
(V)
2
3
4
5
6
50 100 150 200
3878 G24
INTV
CC
I
LOAD
RISING
INTV
CC
I
LOAD
FALLING
DO NOT EXCEED ≥50mA
CONTINUOUS
I
LIMIT
= 150mA,
INTV
CC
> 0.7V
I
LIMIT
= 22mA,
INTV
CC
< 0.7V
V
IN
= 12V
LOAD CURRENT (A)
0
90
92
94
20
3878 G25
88
86
5 10 15 25
84
82
80
EFFICIENCY (%)
1.6%
LTC3878
LTC1778
Q
T
= RJK0305DPB
Q
B
= RJK0330DPB
L = PULSE PA0513.441NLT
f
SW
= 300kHz
V
IN
= 12V
V
OUT
= 1.2V
TEMPERATURE (°C)
–50
RUN/SS PIN CURRENT (µA)
1.2
1.4
3878 G26
1.0
0.8
0
50
100
1.6
V
IN
= 15V
V
OUT
= 1.2V
FCB = INTV
CC
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LTC3878IGN#PBF

Mfr. #:
Buy LTC3878IGN#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Wide Operating Range No Rsense Step-Down Controller
Lifecycle:
New from this manufacturer.
Delivery:
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