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LTC3879 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3879
Description  Fast, Wide Operating Range No RSENSE Step-Down Controller
Download  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3879 Datasheet(HTML) 5 Page - Linear Technology

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LTC3879
5
3879f
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 Pin
Released from GND
Start-Up Into a Pre-Biased Output
RUN Pin Released from GND
Coincident Rail Tracking 1.2V
VOUT Tracks External 1.8V Supply
VOUT (AC)
50mV/DIV
IL
10A/DIV
ILOAD
10A/DIV
50μs/DIV
LOAD STEP 0A TO 10A TO 0A
VIN = 12V
VOUT = 1.2V
MODE = 0V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
3879 G01
VOUT (AC)
50mV/DIV
VSW
20V/DIV
IL
10A/DIV
ILOAD
10A/DIV
5μs/DIV
LOAD STEP 0A TO 10A
VIN = 12V
VOUT = 1.2V
MODE = 0V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
3879 G02
VOUT (AC)
50mV/DIV
VSW
20V/DIV
IL
10A/DIV
ILOAD
10A/DIV
5μs/DIV
LOAD STEP 10A TO 0A
VIN = 12V
VOUT = 1.2V
MODE = 0V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
3879 G03
VOUT (AC)
50mV/DIV
IL
10A/DIV
ILOAD
10A/DIV
50μs/DIV
LOAD STEP 1A TO 11A TO 1A
VIN = 12V
VOUT = 1.2V
MODE = INTVCC
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
3879 G04
Efficiency vs Load Current
RUN
5V/DIV
VOUT
0.5V/DIV
TRACK/SS
0.5V/DIV
20ms/DIV
VIN = 12V
VOUT = 1.2V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
3879 G05
IL
5A/DIV
VOUT
0.5V/DIV
TRACK/SS
0.5V/DIV
20ms/DIV
VIN = 12V
VOUT = 1.2V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
3879 G06
Start-Up After Input Undervoltage
VIN Cycled Low to High
VIN
10V/DIV
VOUT
1V/DIV
TRACK/SS
5V/DIV
100ms/DIV
VIN = 12V
VOUT = 1.2V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
3879 G07
5ms/DIV
VIN = 12V
VOUT = 1.2V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
3879 G08
VMASTER
0.5V/DIV
VOUT
0.5V/DIV
LOAD CURRENT (A)
30
90
100
20
10
80
50
70
60
40
0.01
1
10
100
3879 G09
0
0.1
CONTINUOUS
MODE
DISCONTINUOUS
MODE
VIN = 12V
VOUT = 1.2V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT


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