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LTC7803 Datasheet(PDF) 8 Page - Analog Devices

Part # LTC7803
Description  40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Controller
PDF  42 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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LTC7811
8
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Input Voltage (Boost)
Load Step (Boost)
Burst Mode Operation
Load Step (Boost)
Forced Continuous or
Pulse–Skipping 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) Burst Mode Operation
Efficiency vs Output Current (Boost)
Pulse–Skipping or Forced Continuous
VIN = 5V
VOUT3 = 9.5V
BURST EFFICIENCY
PULSE–SKIPPING
OR FCM EFFICIENCY
FIGURE 10 CIRCUIT
BURST
LOSS
PULSE–SKIPPING
OR 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
Output Current (Boost)
Efficiency and Power Loss vs
7811 G10
VOUT3 = 9.5V
FIGURE 10 CIRCUIT
VIN = 5V
VIN = 8V
VIN = 12V
OUTPUT CURRENT (A)
0.0001
0.001
0.01
0.1
1
10
60
65
70
75
80
85
90
95
100
Burst Mode Operation
Efficiency vs Output Current (Boost)
7811 G11
VOUT3 = 9.5V
FIGURE 10 CIRCUIT
VIN = 5V
VIN = 8V
VIN = 12V
OUTPUT CURRENT (A)
0.0001
0.001
0.01
0.1
1
10
0
10
20
30
40
50
60
70
80
90
100
Pulse–Skipping or Forced Continuous
Efficiency vs Output Current (Boost)
7811 G12
FIGURE 10 CIRCUIT
Burst Mode OPERATION
ILOAD = 4A
ILOAD = 2A
ILOAD = 100mA
INPUT VOLTAGE (V)
2
4
6
8
10
12
75
80
85
90
95
100
Efficiency vs Input Voltage (Boost)
7811 G13
Burst Mode Operation
Load Step (Boost)
VIN = 5V
VOUT = 9.5V
40mA TO 2A LOAD STEP
FIGURE 10 CIRCUIT
100µs/DIV
VOUT3
500mV/DIV
INDUCTOR
CURRENT
2A/DIV
LOAD
CURRENT
2A/DIV
7811 G14
Pulse–Skipping Mode
Forced Continuous or
Load Step (Boost)
VIN = 5V
VOUT = 9.5V
40mA TO 2A LOAD STEP
FIGURE 10 CIRCUIT
100µs/DIV
VOUT3
500mA/DIV
INDUCTOR
CURRENT
2A/DIV
LOAD
CURRENT
2A/DIV
7811 G15
(Boost)
Inductor Current at Light Load
VIN = 5V
VOUT = 9.5V
NO LOAD
FIGURE 10 CIRCUIT
4µs/DIV
Burst Mode
OPERATION
1A/DIV
FORCED
CONTINUOUS
MODE OR
PULSE–SKIPPING
1A/DIV
7811 G16
Soft Start–Up (Boost)
VIN = 5V
FIGURE 10 CIRCUIT
2ms/DIV
VOUT3
2V/DIV
GND
RUN3
5V/DIV
7811 G17
TEMPERATURE (°C)
–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
7811 G18



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