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LTC7803 Datasheet(PDF) 8 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) 8 Page - Analog Devices

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LTC7817
8
Rev 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step (Boost)
Burst Mode Operation
Load Step (Boost)
Pulse-Skipping Mode
Load Step (Boost)
Forced Continuous Mode
Inductor Current at Light Load
(Boost)
Soft Start-Up (Boost)
Boost Regulated Feedback
Voltage vs Temperature
Efficiency and Power Loss
vs Output Current (Boost)
Efficiency
vs Output Current (Boost)
Efficiency vs Input Voltage (Boost)
VIN = 5V
VOUT = 10V
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 (Boost)
Efficiency and Power Loss
7817 G10
FIGURE 10 CIRCUIT
BURST MODE OPERATION
VOUT = 10V
VIN = 8V
VIN = 5V
OUTPUT CURRENT (A)
0.0001
0.001
0.01
0.1
1
10
60
65
70
75
80
85
90
95
100
vs Output Current (Boost)
Efficiency
7817 G11
FIGURE 10 CIRCUIT
PULSE–SKIPPING MODE
VOUT = 10V
ILOAD = 4A
ILOAD = 2A
INPUT VOLTAGE (V)
0
2
4
6
8
10
84
86
88
90
92
94
96
98
100
Efficiency vs Input Voltage (Boost)
7817 G12
Burst Mode Operation
Load Step (Boost)
VIN = 5V
VOUT = 10V
300mA TO 3.3A LOAD STEP
FIGURE 10 CIRCUIT
100µs/DIV
VOUT3
500mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD
CURRENT
5A/DIV
7817 G13
Pulse–Skipping Mode
Load Step (Boost)
VIN = 5V
VOUT = 10V
300mA TO 3.3A LOAD STEP
FIGURE 10 CIRCUIT
100µs/DIV
VOUT3
500mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD
CURRENT
5A/DIV
7817 G14
Forced Continuous Mode
Load Step (Boost)
VIN = 5V
VOUT = 10V
300mA TO 3.3A LOAD STEP
FIGURE 10 CIRCUIT
100µs/DIV
VOUT3
500mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD
CURRENT
5A/DIV
7817 G15
(Boost)
Inductor Current at Light Load
VIN = 5V
VOUT = 10V
NO LOAD
FIGURE 10 CIRCUIT
4µs/DIV
BURST MODE
OPERATION
5A/DIV
PULSE
SKIPPING
MODE
FORCED
CONTINUOUS
MODE
7817 G16
Soft Start–Up (Boost)
2ms/DIV
VOUT3
2V/DIV
RUN3
5V/DIV
GND
7817 G17
FIGURE 10 CIRCUIT
VIN = 5V
VIN = 5V
FIGURE 10 CIRCUIT
TEMPERATURE (oC)
–55 –25
5
35
65
95
125 155
1.183
1.186
1.189
1.192
1.195
1.198
1.201
1.204
1.207
Voltage vs Temperature
Boost Regulated Feedback
7817 G18



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