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LTC3822EDD-1 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3822EDD-1
Description  No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3822EDD-1 Datasheet(HTML) 5 Page - Linear Technology

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LTC3822-1
5
38221f
Maximum Current Sense Voltage
vs ITH Pin Voltage
Oscillator Frequency
vs Input Voltage
Shutdown Quiescent Current
vs Input Voltage
Quiescent Current in Normal
Operation vs Input Voltage
ITH VOLTAGE (V)
0.5
–20
0
20
40
60
100
1
1.5
38221 G03
2
80
Burst Mode OPERATION
(ITH RISING)
Burst Mode OPERATION
(ITH FALLING)
FORCED CONTINUOUS
MODE
PULSE SKIPPING
MODE
TYPICAL PERFORMANCE CHARACTERISTICS T
A = 25°C unless otherwise noted.
INPUT VOLTAGE (V)
2.5
–5
–4
–3
–2
–1
0
2
4.0
38221 G11
4
1
3
5
3.0
3.5
4.5
INPUT VOLTAGE (V)
2.5
0
2
4
6
8
12
4.5
38221 G12
16
10
14
18
3.5
3.0
4.0
INPUT VOLTAGE (V)
2.5
360
4.5
3822 G13
380
370
390
340
330
350
3.5
3.0
4.0
VRUN
1V/DIV
VOUT
1V/DIV
FIGURE 10 CIRCUIT
VIN = 3.3V
VOUT = 1.8V
RLOAD = 1.5Ω
200
µs/DIV
38221 G14
VRUN
1V/DIV
VOUT
1V/DIV
VTRACK/SS
1V/DIV
FIGURE 10 CIRCUIT
VIN = 3.3V
VOUT = 1.8V
RLOAD = 1.5Ω
CSS = 0.01µF
4ms/DIV
38221 G15
Start-Up with Internal Soft-Start
Start-Up with External Soft-Start
Capacitor
Soft-Start with Tracking
Continuous Mode Operation
VOUT
1V/DIV
VTRACK/SS
500mV/DIV
FIGURE 10 CIRCUIT
VIN = 3.3V
VOUT = 1.8V
RLOAD = 1.5Ω
4ms/DIV
38221 G16
VOUT
20mV/DIV
AC COUPLED
IL
2A/DIV
VSW
2V/DIV
FIGURE 10 CIRCUIT
VIN = 3.3V
VOUT = 1.8V, 100mA
2
µs/DIV
38221 G17


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