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TI-LP87702.pdf
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具有诊断功能的 LP87702 双路降压转换器和 5V 升压转换器
1 特性
• 提供 FMEDA 和《功能安全手册》,可支持最高
SIL-2 (IEC 61508) 级别的系统级功能安全要求
• 两个高效降压直流/直流转换器:
– 最大输出电流 3.5A
– 2MHz、3MHz 或 4MHz 开关频率
– 自动 PWM/PFM 和强制 PWM 工作模式
– 输出电压范围为 0.7V 至 3.36V
• 5V 600mA 升压转换器
• 用于外部电压监控的两个输入
• 两个可编程电源正常信号
• 用于诊断的专用基准电压
• 支持复位输出的窗口看门狗
• 外部时钟输入,用于同步
• 扩频调制
• 可通过使能信号实现可编程启动和关断延迟与排序
• 可配置通用输出 (GPO)
• I2C 兼容接口,支持标准 (100kHz)、快速
(400kHz)、快速+ (1MHz) 和高速 (3.4MHz) 模式
• 具有可编程屏蔽的中断功能
• 输出短路和过载保护
• 过热警告和保护
• 过压保护 (OVP) 和欠压锁定 (UVLO)
2 应用
• 楼宇自动化:
– 自动门
– 运动检测器(PIR/运动传感器)
– 视频监控:
• 占位检测(人员跟踪、人数计数
• 工厂自动化:
– 工业机器人 - 安全区域扫描仪
– 自动导航车 (AGV)
– 液位变送器 - 传感
• 工业运输:
– 交通执法
– 十字路口监控
– 公路/铁路传感器
– 智能照明传感器
• 电器:
– AC 控制
– 电器用户界面和连接模块
3 说明
有助于满足最新平台,尤其是汽车雷达和摄像头以及工
业雷达应用的电源管理要求。该器件包含两个降压直
流/直流转换器和一个 5V 升压转换器/旁路开关,可支
持安全关键型应用。该器件集成了两个用于外部电源的
电压监控输入和一个窗口看门狗。
自动 PWM/PFM(AUTO 模式)运行可在降压转换器
的较宽输出电流范围内实现较高效率。
该器件包含一次性可编程 (OTP) 内存。对于给定的应
用,每个可订购器件型号都有特定的 OTP 设置。有关
每个可订购器件型号的默认 OTP 配置的详细信息,请
参见技术参考手册。
器件信息
(1)
器件型号 封装 封装尺寸(标称值)
LP87702 VQFN (32) 5.00mm × 5.00mm
(1) 如需了解所有可用封装,请参阅数据表末尾的可订购产品附
录。
Copyright © 2017, Texas Instruments Incorporated
SW_B0VIN_B0
VIN_B1
VANA
VIN
FB_B0
VOUT0
LOAD
SDA (EN3)
SCL (EN2)
nINT
CLKIN (GPO2/WD_DIS)
GNDs
EN1
SW_B1
FB_B1
VOUT1
PG0
VMON1
VMON2
PG1 (GPO1)
WDI WD_RESET
SW_BST
VOUT_BST
VOUT2
LOAD
LOAD
GPO0
NRST
简化版原理图
Output Current (mA)
Efficiency (%)
1 10 100 1000 5000
50
60
70
80
90
100
Exce
VIN=3.3V, VOUT=1.2V
VIN=3.3V, VOUT=1.8V
VIN=3.3V, VOUT=2.3V
降压效率与输出电流的关系
LP87702
ZHCSNP2 – MARCH 2021
本文档旨在为方便起见,提供有关 TI 产品中文版本的信息,以确认产品的概要。有关适用的官方英文版本的最新信息,请访问
www.ti.com,其内容始终优先。TI 不保证翻译的准确性和有效性。在实际设计之前,请务必参考最新版本的英文版本。
English Data Sheet: SNVSBU3
Table of Contents
1 特性................................................................................... 1
2 应用................................................................................... 1
3 说明................................................................................... 1
4 Revision History.............................................................. 2
5 Pin Configuration and Functions...................................3
6 Specifications.................................................................. 5
6.1 Absolute Maximum Ratings........................................ 5
6.2 ESD Ratings............................................................... 5
6.3 Recommended Operating Conditions.........................5
6.4 Thermal Information....................................................6
6.5 Electrical Characteristics.............................................6
6.6 I
2
C Serial Bus Timing Parameters............................ 12
6.7 Typical Characteristics.............................................. 14
7 Detailed Description......................................................15
7.1 Overview................................................................... 15
7.2 Functional Block Diagram......................................... 16
7.3 Feature Descriptions.................................................16
7.4 Device Functional Modes..........................................39
7.5 Programming............................................................ 41
7.6 Register Maps...........................................................44
8 Application and Implementation.................................. 78
8.1 Application Information............................................. 78
8.2 Typical Application.................................................... 78
9 Power Supply Recommendations................................87
10 Layout...........................................................................87
10.1 Layout Guidelines................................................... 87
10.2 Layout Example...................................................... 88
11 Device and Documentation Support..........................89
11.1 第三方产品免责声明................................................ 89
11.2 Receiving Notification of Documentation Updates.. 89
11.3 支持资源..................................................................89
11.4 Trademarks............................................................. 89
11.5 静电放电警告...........................................................89
11.6 术语表..................................................................... 89
12 Mechanical, Packaging, and Orderable
Information.................................................................... 89
4 Revision History
注:以前版本的页码可能与当前版本的页码不同
DATE REVISION NOTES
March 2021 * Initial Release
LP87702
ZHCSNP2 – MARCH 2021
www.ti.com.cn
2 Submit Document Feedback
Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: LP87702
5 Pin Configuration and Functions
9
10
11
12
13
14
2 3 4 5 61 7
20 19 18 1723 2122
29
28
27
25
32
31
30
GPO0
NRST
VIN_B1
VIN_B1
SW_B1
PGND_B1
PGND_B1
SCL (EN2)
SDA (EN3)
CLK(GPO2)
PGND_B0
PGND_B0
WD_RESET
VANA
AGND
FB_B1
FB_B0
SW_B0
SW_B0
VIN_B0
VIN_B0
THERMAL PAD
8
16
SW_B1
24
26 15
PG0
VMON1
VMON2 PGND_BST
VOUT_BST
SW_BST
EN1
WDI
PG1 (GPO1)
nINT
图 5-1. RHB Package 32-Pin VQFN With Thermal Pad Top View
表 5-1. Pin Functions
PIN
TYPE DESCRIPTION
NAME NUMBER
AGND 4 G Ground
CLKIN 22 D/I/O External clock input. Alternative function is general purpose digital output 2 (GPO2).
EN1 19 D/I Programmable Enable 1 signal.
FB_B0 2 A Output voltage feedback for Buck0.
FB_B1 3 A Output voltage feedback for Buck1.
GPO0 12 D/O General purpose digital output 0.
nINT 1 D/O Open-drain interrupt output. Active LOW.
NRST 11 D/I Reset signal for the device.
PG0 29 D/O Programmable power-good indication signal.
PG1 32 D/O
Programmable power-good indication signal. Alternative function is general purpose digital output
1 (GPO1).
PGND_B0 23, 24 P/G Power ground for Buck0.
PGND_B1 17, 18 P/G Power Ground for Buck1.
PGND_BST 10 P/G Power ground for boost.
SCL 20 D/I
Serial interface clock input for I2C access. Connect a pullup resistor. Alternative function is
programmable to the enable 2 signal.
SDA 21 D/I/O
Serial interface data input and output for I2C access. Connect a pullup resistor. Alternative
function is programmable to the enable 3 signal.
SW_B0 25, 26 P/O Buck0 switch node.
SW_B1 15, 16 P/O Buck1 switch node.
SW_BST 9 P/I Boost input.
VANA 5 P Supply voltage for analog and digital blocks. Must be connected to same node with VIN_Bx.
VMON1 30 A/I Voltage monitoring input 1.
www.ti.com.cn
LP87702
ZHCSNP2 – MARCH 2021
Copyright © 2021 Texas Instruments Incorporated
Submit Document Feedback
3
Product Folder Links: LP87702
表 5-1. Pin Functions (continued)
PIN
TYPE DESCRIPTION
NAME NUMBER
VMON2 31 A/I Voltage monitoring input 2.
VIN_B0 27, 28 P/I
Input for Buck0. The separate power pins VIN_Bx are not connected together internally – VIN_Bx
pins must be connected together in the application and be locally bypassed.
VIN_B1 13, 14 P/I
Input for Buck1. The separate power pins VIN_Bx are not connected together internally – VIN_Bx
pins must be connected together in the application and be locally bypassed.
VOUT_BST 8 P/O Boost output.
WD_RESET 6 D/O Reset output from window watchdog
WDI 7 D/I Digital input signal for window watchdog
Thermal pad N/A G
A: Analog Pin, D: Digital Pin, G: Ground Pin, P: Power Pin, I: Input Pin, O: Output Pin
LP87702
ZHCSNP2 – MARCH 2021
www.ti.com.cn
4 Submit Document Feedback
Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: LP87702
6 Specifications
6.1 Absolute Maximum Ratings
Over operating free-air temperature range (unless otherwise noted)
(1)
(2)
MIN MAX UNIT
VIN_B0,
VIN_B1, SW_BST,
VANA
Voltage on input power connections –0.3 6
V
SW_B0, SW_B1 Voltage on buck switch nodes –0.3 (VIN_Bx + 0.3 V) with
6-V maximum
V
FB_B0, FB_B1 Voltage on buck voltage sense nodes –0.3 (VANA + 0.3 V) with
6-V maximum
V
VOUT_BST Voltage on boost output –0.3 6 V
SCL (EN2), SDA (EN3),
VMON1, VMON2
Voltage on voltage monitoring pins –0.3 (VANA + 0.3 V) with
6-V maximum
V
NRST, EN1, nINT Voltage on logic pins (input or output pins) –0.3 6 V
PG0, PG1 (GPO1),
GPO0, CLKIN (GPO2),
WDI, WD_RESET
Voltage on logic pins (input or output pins) –0.3 (VANA + 0.3 V) with
6-V maximum V
T
J-MAX
Junction temperature −40 150 °C
T
stg
Storage temperature –65 150 °C
Maximum lead temperature (soldering, 10 sec.) 260 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress
ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under
Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device
reliability.
(2) All voltage values are with respect to network ground.
6.2 ESD Ratings
VALUE UNIT
V
(ESD)
Electrostatic discharge
Human-body model (HBM), per AEC Q100-002
(1)
±2000
V
Charged-device model (CDM), per AEC
Q100-011
All pins ±500
Corner pins (1, 8, 9, 16, 17,
24, 25, 32)
±750
(1) AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
INPUT VOLTAGE
VIN_B0, VIN_B1, SW_BST, VANA Voltage on input power connections 2.8 5.5 V
VMON1, VMON2 Voltage on voltage monitoring pins 0 5.5 V
NRST, EN1, EN2, EN3, nINT Voltage on logic pins (input or output pins) 0 5.5
PG0, PG1 (GPO1), GPO0, CLKIN
(GPO2), WDI, WD_RESET
Voltage on logic pins (input or output pins) 0 VANA V
SCL, SDA
Voltage on I2C interface, Standard (100 kHz), Fast
(400 kHz), Fast+ (1 MHz), and High-Speed (3.4
MHz) Modes
0 1.95 V
Voltage on I2C interface, Standard (100 kHz), Fast
(400 kHz), and Fast+ (1 MHz) Modes
0 VANA with 3.6-V
maximum
V
TEMPERATURE
Junction temperature, T
J
−40 140 °C
www.ti.com.cn
LP87702
ZHCSNP2 – MARCH 2021
Copyright © 2021 Texas Instruments Incorporated
Submit Document Feedback
5
Product Folder Links: LP87702
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