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Analog Devices LT8708
Linear Technology Analog Devices LT8708 Manuals
Manuals and User Guides for Linear Technology Analog Devices LT8708. We have
1
Linear Technology Analog Devices LT8708 manual available for free PDF download: Datasheet
Linear Technology Analog Devices LT8708 Datasheet (64 pages)
80V Synchronous 4-Switch Buck-Boost DC/DC Controller with Flexible Bidirectional Capability
Brand:
Linear Technology
| Category:
Controller
| Size: 3 MB
Table of Contents
Features
1
Applications
1
Typical Application
1
Description
1
Table of Contents
2
Absolute Maximum Ratings
3
Order Information
3
Pin Configuration
3
Electrical Characteristics
4
Typical Performance Characteristics
9
Typical Performance Characteristics
11
Pin Functions
13
Block Diagram
15
Operation
16
Typographical Conventions
16
Start-Up
16
Start-Up: SHDN Pin
16
Start-Up: SWEN Pin
16
Start-Up: Soft-Start of Switching Regulator
17
Control Overview
17
Power Switch Control
18
Switch Control: Buck Region (VIN >> VOUT )
19
Switch Control: Buck-Boost
19
In out
19
Switch Control: Boost Region
20
In out
20
Switch Control: Soft-Start
20
Uni and Bidirectional Conduction
20
Bidirectional Conduction: CCM
21
Unidirectional Conduction: DCM
21
Unidirectional Conduction: HCM
22
Unidirectional Conduction: Burst Mode
22
Error Amplifiers
22
VOUT Regulation and Sensing
23
VOUT : Regulation
23
VOUT : above Regulation
23
VOUT : below Regulation and Undervoltage
23
VIN Regulation and Sensing
24
VIN : Regulation
24
VIN : above Regulation and Overvoltage
24
VIN : below Regulation
24
Current Monitoring and Limiting
24
Monitoring and Limiting: IMON Pins
24
Monitoring: ICP and ICN Pins
25
INTV CC /EXTV CC /GATEV CC /LDO33 Power
25
CLKOUT and Temperature Sensing
25
Applications Information
26
Verify the Power Flow Conditions
26
Operating Frequency Selection
26
Internal Oscillator
27
SYNC Pin and Clock Synchronization
27
CLKOUT Pin and Clock Synchronization
27
Inductor Current Sensing and Slope Compensation
27
RSENSE Selection and Maximum Current
28
RSENSE Selection: Max RSENSE in the Boost Region
28
RSENSE Selection: Max RSENSE
30
Buck Region
30
In the
30
Rsense Sense
30
RSENSE Filtering
32
Inductor (L) Selection
32
L Selection: Load Current in Buck and Boost Regions
32
L Selection: Subharmonic Oscillations
33
L Selection: Maximum Current Rating
33
Power MOSFET Selection
34
CIN and COUT Selection
37
Schottky Diode (D1, D2, D3, D4) Selection
38
Topside MOSFET Driver Supply (C )
39
Top Driver: Boost Cap Charge Control Block
39
VINHIMON, VOUTLOMON and RVSOFF
39
IIN and IOUT Current Monitoring and Limiting
42
Loop Compensation
44
INTV CC Regulators and EXTV CC Connection
45
LDO33 Regulator
45
Voltage Lockouts
46
Junction Temperature Measurement
46
Thermal Shutdown
47
Efficiency Considerations
47
Circuit Board Layout Checklist
47
Hot Plugging Considerations
49
Design Example
49
Typical Applications
55
Package Description
63
Typical Application
64
Related Parts
64
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