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LTC3809EDD-TRPBF Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3809EDD-TRPBF
Description  No RSENSE?? Low EMI, Synchronous DC/DC Controller
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3809EDD-TRPBF Datasheet(HTML) 4 Page - Linear Technology

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LTC3809
4
3809fc
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
Maximum Current Sense Voltage
vs ITH Pin Voltage
Load Step
(Burst Mode Operation)
Load Step (Pulse-Skipping Mode)
Start-Up with Internal Soft-Start
TA = 25°C unless otherwise noted.
LOAD CURRENT (mA)
100
90
80
70
95
85
75
65
60
1
100
1k
10k
3809 G01
10
VOUT = 3.3V
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
FIGURE 10 CIRCUIT
SYNC/MODE = VIN
VIN = 5V
LOAD CURRENT (mA)
100
90
80
70
95
85
75
65
50
55
60
3809 G02
1
100
1k
10k
10
FIGURE 10 CIRCUIT
VIN = 5V, VOUT = 2.5V
FORCED
CONTINUOUS
(SYNC/MODE = 0V)
PULSE SKIPPING
(SYNC/MODE = 0.6V)
BURST MODE
(SYNC/MODE =
VIN)
ITH VOLTAGE (V)
0.5
–20
0
20
40
60
100
1
1.5
3809 G03
2
80
Burst Mode OPERATION
(ITH RISING)
Burst Mode OPERATION
(ITH FALLING)
FORCED CONTINUOUS
MODE
PULSE SKIPPING
MODE
Efficiency vs Load Current
VOUT
200mV/DIV
AC COUPLED
IL
2A/DIV
100μs/DIV
VIN = 3.3V
VOUT = 1.8V
ILOAD = 300mA TO 3A
SYNC/MODE = VIN
FIGURE 10 CIRCUIT
3809 G04
VOUT
200mV/DIV
AC COUPLED
IL
2A/DIV
100μs/DIV
VIN = 3.3V
VOUT = 1.8V
ILOAD = 300mA TO 3A
SYNC/MODE = 0V
FIGURE 10 CIRCUIT
3809 G05
Load Step
(Forced Continuous Mode)
VOUT
200mV/DIV
AC COUPLED
IL
2A/DIV
100μs/DIV
VIN = 3.3V
VOUT = 1.8V
ILOAD = 300mA TO 3A
SYNC/MODE = VFB
FIGURE 10 CIRCUIT
3809 G06
VOUT
1.8V
500mV/DIV
200μs/DIV
VIN = 4.2V
RLOAD = 1Ω
FIGURE 10 CIRCUIT
3809 G07


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