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LTC7803 Datasheet(PDF) 7 Page - Analog Devices

Part # LTC7803
Description  40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller
PDF  44 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC7803 Datasheet(HTML) 7 Page - Analog Devices

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LTC7817
7
Rev 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step (Buck)
Burst Mode Operation
Load Step (Buck)
Forced Continuous Mode
Load Step (Buck)
Pulse-Skipping Mode
Inductor Current at Light Load
(Buck)
Soft Start-Up
Buck Regulated Feedback Voltage
vs Temperature
Efficiency and Power Loss
vs Output Current (Buck)
Efficiency and Power Loss
vs Output Current (Buck)
Efficiency vs Input Voltage (Buck)
VIN = 10V
VOUT = 5V
BURST EFFICIENCY
PULSE–SKIPPING
EFFICIENCY
FIGURE 10 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 (Buck)
Efficiency and Power Loss
7817 G01
VIN = 10V
VOUT = 5V
EFFICIENCY
POWER LOSS
fSW=380kHz (FIGURE 10)
fSW=2.25MHz (FIGURE 14)
OUTPUT CURRENT (A)
0.0001
0.001
0.01
0.1
1
10
40
50
60
70
80
90
100
0.0001
0.001
0.01
0.1
1
10
100
vs Output Current (Buck)
Efficiency and Power Loss
7817 G02
VIN = 10V
VOUT = 5V
ILOAD = 4A
fSW = 380kHz (FIGURE 10)
fSW = 2.25MHz (FIGURE 14)
INPUT VOLTAGE (V)
4
12
20
28
36
75
80
85
90
95
100
Efficiency vs Input Voltage (Buck)
7817 G03
Burst Mode Operation
Load Step (Buck)
VIN = 10V
VOUT = 5V
300mA TO 6A LOAD STEP
FIGURE 10 CIRCUIT
50µs/DIV
VOUT
200mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD
CURRENT
5A/DIV
7817 G04
Pulse–Skipping Mode
Load Step (Buck)
VIN = 10V
VOUT = 5V
300mA TO 6A LOAD STEP
FIGURE 10 CIRCUIT
50µs/DIV
VOUT
200mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD
CURRENT
5A/DIV
7817 G05
Forced Continuous Mode
Load Step (Buck)
VIN = 10V
VOUT = 5V
300mA TO 6A LOAD STEP
FIGURE 10 CIRCUIT
50µs/DIV
VOUT
200mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD
CURRENT
5A/DIV
7817 G06
(Buck)
Inductor Current at Light Load
VIN = 10V
VOUT = 5V
NO LOAD
FIGURE 10 CIRCUIT
4µs/DIV
BURST MODE
OPERATION
2A/DIV
PULSE
SKIPPING
MODE
FORCED
CONTINUOUS
MODE
7817 G07
Soft Start–Up
RUN1,2
5V/DIV
VOUT1
1V/DIV
VOUT2
1V/DIV
VIN = 10V
FIGURE 10 CIRCUIT
1ms/DIV
7817 G08
TEMPERATURE (oC)
–55 –25
5
35
65
95
125 155
792
794
796
798
800
802
804
806
808
Voltage vs Temperature
Buck Regulated Feedback
7817 G09



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