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LTC3880 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3880
Description  Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller
PDF  50 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3880 Datasheet(HTML) 6 Page - Linear Technology

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LTC3839
6
3839fa
TYPICAL PERFORMANCE CHARACTERISTICS
Phase Relationship:
PHASMD = Ground
Phase Relationship:
PHASMD = Float
Phase Relationship:
PHASMD = INTVCC
Overcurrent Protection
Regular Soft Start-Up
Short-Circuit Protection
Soft Start-Up Into
Pre-Biased Output
Overvoltage Protection
Output Tracking
VOUT
100mV/DIV
AC-COUPLED
5ms/DIV
3839 G12
VIN = 12V
VOUT = 1.2V
FORCED CONTINUOUS MODE
IL
5A/DIV
FULL CURRENT LIMIT
WHEN VOUT HIGHER
THAN HALF OF REGULATED
VOUT
1V/DIV
SHORT-
CIRCUIT
TRIGGER
500μs/DIV
3839 G13
VIN = 12V
VOUT = 1.2V
ILOAD = 0A
IL
10A/DIV
COUT
RECHARGE
CURRENT LIMIT STARTS TO FOLD BACK AS
VOUT DROPS BELOW HALF OF REGULATED
VOUT
100mV/DIV
AC-COUPLED
20μs/DIV
3839 G14
VIN = 12V
VOUT = 1.2V
FORCED CONTINUOUS
MODE
ILOAD = 0A
BG STAYS ON UNTIL
VOUT IS PULLED
BELOW OVERVOLTAGE
THRESHOLD
IL
10A/DIV
BG1
5V/DIV
OVERVOLTAGE CREATED BY APPLYING
A CHARGED CAPACITOR TO VOUT
500ns/DIV
60°
0°
3839 G15
FIGURE 13 CIRCUIT
VIN = 12V
LOAD = 0A
MODE/PLLIN = 333kHz EXTERNAL CLOCK
CLKOUT
5V/DIV
SW2
10V/DIV
SW1
10V/DIV
PLLIN
5V/DIV
180°
500ns/DIV
0°
3839 G16
CLKOUT
5V/DIV
SW2
10V/DIV
SW1
10V/DIV
PLLIN
5V/DIV
90°
180°
FIGURE 13 CIRCUIT
VIN = 12V
LOAD = 0A
MODE/PLLIN = 333kHz EXTERNAL CLOCK
500ns/DIV
0°
3839 G17
CLKOUT
5V/DIV
SW2
10V/DIV
SW1
10V/DIV
PLLIN
5V/DIV
120°
240°
FIGURE 13 CIRCUIT
VIN = 12V
LOAD = 0A
MODE/PLLIN = 333kHz EXTERNAL CLOCK
RUN
5V/DIV
VOUT
500mV/DIV
1ms/DIV
3839 G09
CSS = 10nF
VIN = 12V
VOUT = 1.2V
FORCED CONTINUOUS MODE
TRACK/SS
200mV/DIV
RUN
5V/DIV
VOUT
500mV/DIV
1ms/DIV
3839 G10
CSS = 10nF
VIN = 12V
VOUT = 1.2V
VOUT PRE-BIASED TO 0.75V
TRACK/SS
200mV/DIV
VOUT
500mV/DIV
10ms/DIV
3839 G11
VIN = 12V
VOUT = 1.2V
FORCED CONTINUOUS MODE
TRACK/SS
200mV/DIV



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