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LTC7803 Datasheet(PDF) 6 Page - Analog Devices

Part # LTC7803
Description  40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum
PDF  34 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC7803 Datasheet(HTML) 6 Page - Analog Devices

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LTC7802-3.3
6
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency and Power Loss
vs Load Current
Efficiency vs Load Current
Efficiency vs Input Voltage
Load Step Burst Mode Operation
Load Step Pulse-Skipping Mode
Load Step Forced
Continuous Mode
Inductor Current at Light Load
Soft Start-Up
Regulated Feedback Voltage
vs Temperature
VIN = 12V
VOUT = 5V
BURST EFFICIENCY
PULSE–SKIPPING
EFFICIENCY
FIGURE 9 CIRCUIT
FCM EFFICIENCY
BURST
LOSS
PULSE–SKIPPING
LOSS
FCM LOSS
OUTPUT CURRENT (A)
0.0001
0.001
0.01
0.1
1
10
0
10
20
30
40
50
60
70
80
90
100
0.001
0.01
0.1
1
10
100
vs Output Current
780233 G01
FIGURE 9 CIRCUIT
Burst Mode OPERATION
VOUT = 5V
VIN = 8V
VIN = 16V
VIN = 24V
OUTPUT CURRENT (A)
0.0001
0.001
0.01
0.1
1
10
50
55
60
65
70
75
80
85
90
95
100
Efficiency vs Load Current
780233 G02
FIGURE 9 CIRCUIT
ILOAD1,2 = 8A
VOUT1 = 3.3V
VOUT2 = 5V
INPUT VOLTAGE (V)
0
5
10
15
20
25
30
35
40
86
88
90
92
94
96
98
100
Efficiency vs Input Voltage
780233 G03
VIN = 12V
VOUT = 5V
300mA TO 8A LOAD STEP
FIGURE 9 CIRCUIT
50µs/DIV
780233 G04
VOUT
500mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD
CURRENT
5A/DIV
VIN = 12V
VOUT = 5V
300mA TO 8A LOAD STEP
FIGURE 9 CIRCUIT
50µs/DIV
780233 G05
VOUT
500mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD
CURRENT
5A/DIV
Forced Continuous Mode
VIN = 12V
VOUT = 5V
300mA TO 8A LOAD STEP
FIGURE 9 CIRCUIT
50µs/DIV
780233 G06
VOUT
500mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD
CURRENT
5A/DIV
Inductor Current at Light Load
VIN = 12V
VOUT = 5V
NO LOAD
FIGURE 9 CIRCUIT
4µs/DIV
FORCED
CONTINUOUS
MODE
BURST MODE
OPERATION
2A/DIV
PULSE
SKIPPING
MODE
780233 G07
RUN1,2
5V/DIV
VOUT1
1V/DIV
VOUT2
1V/DIV
VIN = 12V
FORCED CONTINUOUS MODE
FIGURE 9 CIRCUIT
1ms/DIV
780233 G08
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
–1.00
–0.75
–0.50
–0.25
0
0.25
0.50
0.75
1.00
78023 G09



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