參數(shù)資料
型號： TPS53851RHHT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PQCC36
封裝： PLASTIC, VQFN-36
文件頁數(shù)： 23/66頁
文件大小： 1264K
代理商： TPS53851RHHT
www.ti.com
SLUS985 – DECEMBER 2009
1
INTRODUCTION
......................................... 1
5.14
OUTPUT OVERVOLTAGE PROTECTION
........ 20
1.1
FEATURES
.......................................... 1
5.15
CLKFLT, CLKIO PIN FAULT
....................... 20
1.2
APPLICATIONS
...................................... 1
5.16
PHSEL PIN FAULT
................................. 21
1.3
DESCRIPTION
....................................... 1
5.17
OVERTEMPERATURE
............................. 21
1.4
ORDERING INFORMATION
......................... 2
5.18
FAULT MASKING OPERATION
................... 21
2
DEVICE RATINGS
....................................... 4
5.19
PROTECTION AND FAULT MODES
.............. 21
2.1
ABSOLUTE MAXIMUM RATINGS
.................. 4
5.20
SETTING THE SWITCHING FREQUENCY
........ 22
2.2
RECOMMENDED OPERATING CONDITIONS
..... 4
5.21
SYNCHRONIZING A SINGLE CONTROLLER TO
2.3
ELECTROSTATIC DISCHARGE (ESD)
AN EXTERNAL CLOCK
............................ 22
PROTECTION
....................................... 4
5.22
SPLIT INPUT VOLTAGE OPERATION
............ 23
2.4
PACKAGE DISSIPATION RATINGS
................ 4
5.23
CURRENT SENSE
................................. 24
2.5
ELECTRICAL CHARACTERISTICS
................. 5
5.24
CURRENT SENSING AND BALANCING
.......... 25
3
TYPICAL CHARACTERISTICS
........................ 8
5.25
OVERCURRENT DETECTION AND HICCUP
4
DEVICE INFORMATION
............................... 12
MODE
.............................................. 25
5.26
CALCULATING OVERCURRENT PROTECTION
4.1
TERMINAL CONFIGURATION
..................... 12
LEVEL
.............................................. 26
4.2
CLOCK MASTER AND CLOCK SLAVE
........... 12
5.27
CONFIGURING SINGLE AND MULTIPLE
4.3
VOLTAGE MASTER AND VOLTAGE SLAVE
..... 13
DEVICES
........................................... 28
4.4
FUNCTIONAL BLOCK DIAGRAM
.................. 15
5.28
DIGITAL CLOCK SYNCHRONIZATION
........... 39
5
APPLICATION INFORMATION
...................... 16
5.29
DESIGN EXAMPLES INFORMATION
............. 41
5.1
FUNCTIONAL DESCRIPTION
..................... 16
6
DESIGN EXAMPLES
.................................. 43
6.1
Example 1: Dual-Output Configuration from 12 V to
5.2
DATA SHEET ORGANIZATION
.................... 16
3.3 V and 1.5 V DC-to-DC Converter Using a
5.3
TYPICAL START UP SEQUENCE
................. 16
TPS53851
.......................................... 43
5.4
TRACK (SOFT-START WITHOUT PRE-BIASED
6.2
Example 2: Two-Phase Single Output Configuration
From 12 V to 1.5 V DC/DC Converter Using a
OUTPUT)
........................................... 17
TPS53851
.......................................... 50
5.5
SOFT-START WITH PRE-BIASED OUTPUTS
.... 17
6.3
Example 3: Four-Phase Single Output Configuration
5.6
TRACK FUNCTION IN CONFIGURING A SLAVE
From 12 V to 1.8 V DC-to-DC Converter Using Two
CHANNEL
.......................................... 19
TPS53851
.......................................... 54
5.7
DIFFERENTIAL AMPLIFER, U9
................... 19
6.4
ABBREVIATIONS
.................................. 59
6.5
LAYOUT CONSIDERATIONS
...................... 60
5.8
POWER GOOD
..................................... 19
7
ADDITIONAL REFERENCES
......................... 61
5.9
SETTING THE OUTPUT VOLTAGE
............... 19
5.10
PROGRAMMABLE INPUT UNDERVOLTAGE
7.1
Related Parts
....................................... 61
LOCK OUT PROTECTION
......................... 20
7.2
References
......................................... 61
5.11
POWER ON RESET (POR)
........................ 20
7.3
Package Outline
.................................... 61
5.12
OVERCURRENT
................................... 20
7.4
Recommended PCB Footprint
...................... 61
5.13
OUTPUT UNDERVOLTAGE PROTECTION
....... 20
Copyright 2009, Texas Instruments Incorporated
Contents
3
Product Folder Link(s): TPS53851
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