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LM27762数据手册
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LM27762 提供可在±1.5 V 和 ±5 V 之间调节的极低噪 声正输出和负输出。输入电压范围为 2.7 V 至 5.5 V, 输出电流高达 ±250 mA 。 LM27762 的工作电流仅为 390 µA,典型关断电流为 0.5 µA,具有理想的性能, 可满足功率放大器和 DAC 偏置以及其他高电流、低噪 声负电压的需求。该器件的解决方案尺寸小,外部元件 少。 负电压由一个稳压反相电荷泵和一个低噪声负 LDO 产 生。 LM27762 器件的反相电荷泵以 2 MHz(典型值) 的开关频率工作,以降低输出电阻和电压纹波。正电压 由低噪声正 LDO 从输入端产生。 LM27762 的正负输出具有专用使能输入。这些输出支 持正轨和负轨有独立的时序,以满足特定系统电源时 序的需要。使能输入也可以短接在一起,并连接到输 入电压。 LM27762 具有可选的电源良好功能。
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LM27762
VIN
C1-
C1+
PGOOD
EN+
EN-
CP
OUT+
FB+
GND
FB-
OUT-
C
1
R
PU
C
CP
C
OUT+
C
OUT-
R
1
R
2
R
3
R
4
C
VIN
2.7 V to 5.5 V
1.5 V to 5 V
-1.5 V to -5 V
Copyright © 2016, Texas Instruments Incorporated
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
English Data Sheet: SNVSAF7
LM27762
ZHCSFJ0B –AUGUST 2016–REVISED FEBRUARY 2017
LM27762 集集成成低低噪噪声声正正负负输输出出的的
电电荷荷泵泵和和 LDO
1
1 特特性性
1
• 可生成低噪声、可调节的 1.5V 至 5V 的正电源电压
和 -5V 至 -1.5V 的负电源电压
• 输入电压范围为 2.7V 至 5.5V
• ±250mA 输出电流
• 反向电荷泵紧接一个负电压低压降稳压器 (LDO)
• 2MHz 固定频率、低噪声运行
• 2.5Ω 逆变器输出阻抗,V
IN
= 5V
• 电流为 100mA 时的负电压 LDO 压降电压为
30mV,V
OUT
= -5V
• 电流为 100mA 时的正电压 LDO 压降电压为
45mV,V
OUT
= 5V
• 390µA 静态电流(典型值)
• 关断时的静态电流降至 0.5µA(典型值)
• 电流限制和热保护
• 电源正常引脚(低电平有效)
• 使用 LM27762 并借助 WEBENCH
®
电源设计器创
建定制设计
2 应应用用
• 高保真 (Hi-Fi) 音频耳机放大器
• 运算放大器电源偏置
• 为数据转换器供电
• 无线通信系统
• 接口电源
• 手持式仪表
3 说说明明
LM27762 提供 ±1.5V 至 ±5V 可调节、超低噪声正负
输出。输入电压范围为 2.7V 至 5.5V,输出电流高达 ±
250mA。LM27762 的工作电流仅为 390µA并且关断电
流的典型值为 0.5µA,因此可为功率放大器、数模转换
器 (DAC) 偏置以及其他大电流、低噪声、负电压应用
提供理想性能。该器件采用小型解决方案尺寸,所需外
部组件很少。
负电压由经过稳压的反相电荷泵生成,该电荷泵紧接一
个低噪声、负电压 LDO。LM27762 器件的反相电荷泵
在 2MHz(典型值)开关频率下运行,可减少输出阻抗
和电压纹波。正电压由低噪声正电压 LDO 的输入生
成。
LM27762 的正负电压输出配有专用使能输入。为满足
特定的系统电源排序需要,这些输出支持独立的正负电
源轨时序。使能输入也可短接在一起并与输入电压相
连。LM27762 具有可选的电源正常功能。
器器件件信信息息
(1)
器器件件型型号号 封封装装 封封装装尺尺寸寸((标标称称值值))
LM27762 WSON (12) 2.00mm x 3.00mm
(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。
空白
简简化化电电路路原原理理图图
2
LM27762
ZHCSFJ0B –AUGUST 2016–REVISED FEBRUARY 2017
www.ti.com.cn
Copyright © 2016–2017, Texas Instruments Incorporated
目目录录
1 特特性性.......................................................................... 1
2 应应用用.......................................................................... 1
3 说说明明.......................................................................... 1
4 修修订订历历史史记记录录 ........................................................... 2
5 Pin Configuration and Functions......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information.................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics.............................................. 6
7 Detailed Description.............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 11
8 Application and Implementation ........................ 12
8.1 Application Information............................................ 12
8.2 Typical Application ................................................. 12
9 Power Supply Recommendations...................... 17
10 Layout................................................................... 17
10.1 Layout Guidelines ................................................. 17
10.2 Layout Example .................................................... 18
11 器器件件和和文文档档支支持持 ..................................................... 19
11.1 器件支持................................................................ 19
11.2 接收文档更新通知 ................................................. 19
11.3 社区资源................................................................ 19
11.4 商标 ....................................................................... 19
11.5 静电放电警告......................................................... 19
11.6 Glossary................................................................ 19
12 机机械械、、封封装装和和可可订订购购信信息息....................................... 20
4 修修订订历历史史记记录录
注:之前版本的页码可能与当前版本有所不同。
Changes from Revision A (September 2016) to Revision B Page
• 已添加 添加了 WEBENCH 链接 ............................................................................................................................................ 1
Changes from Original (July 2016) to Revision A Page
• 已更改 标题中的“开关电容”至“充电泵”.................................................................................................................................... 1
• 已更改 “可生成低噪声、可调节的 ±1.5V 至 ±5V 正负电源电压”至“可生成低噪声、可调节的 1.5V 至 5V 的正电源电压
和 -5V 至 -1.5V 的负电源电压”
(
“
特性
”
中)
........................................................................................................................... 1
1
4
2
3
85
76
THERMAL PAD
12
9
11
10
3
LM27762
www.ti.com.cn
ZHCSFJ0B –AUGUST 2016–REVISED FEBRUARY 2017
Copyright © 2016–2017, Texas Instruments Incorporated
5 Pin Configuration and Functions
DSS Package
12-Pin WSON With Thermal Pad
Top View
Pin Functions
PIN
TYPE DESCRIPTION
NAME NUMBER
C1+ 10 Power Positive terminal for C
1
C1– 9 Power Negative terminal for C
1
CP 5 Power Negative unregulated output voltage
EN+ 12 Input Enable input for the positive LDO, Active high
EN– 8 Input Enable input for the charge pump and negative LDO, Active high
FB+ 2 Power Feedback input. Connect FB+ to an external resistor divider between OUT+ and
GND. DO NOT leave unconnected.
FB– 7 Power Feedback input. Connect FB– to an external resistor divider between OUT– and
GND. DO NOT leave unconnected.
GND 4 Ground Ground
OUT+ 11 Power Regulated positive output voltage
OUT– 6 Power Regulated negative output voltage
PGOOD 1 Output Power Good flag; open drain; Logic 0 = power good, Logic 1 = power not good.
Connect to ground if not used.
VIN 3 Power Positive power supply input
Thermal Pad — Ground Ground. DO NOT leave unconnected.
4
LM27762
ZHCSFJ0B –AUGUST 2016–REVISED FEBRUARY 2017
www.ti.com.cn
Copyright © 2016–2017, Texas Instruments Incorporated
(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) If Military/Aerospace specified devices are required, contact the TI Sales Office/Distributors for availability and specifications.
(3) OUT may be shorted to GND for one second without damage. However, shorting OUT to VIN may damage the device and must be
avoided. Also, for temperatures above T
A
= 85°C, V
OUT
must not be shorted to GND or VIN or device may be damaged.
(4) Internal thermal shutdown circuitry protects the device from damage.
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
(1)(2)
MIN MAX UNIT
VIN to GND or GND to VOUT 5.8 V
EN+, EN- GND − 0.3 V
IN
V
CPOUT, OUT+ and OUT- , continuous output current 300 mA
OUT+, OUT- short-circuit duration to GND
(3)
1 s
Continuous power dissipation
(4)
Internally limited
T
JMAX
(4)
150 °C
Operating input voltage, V
IN
2.7 5.5 V
Operating output current, I
OUT
0 250 mA
Operating ambient temperature, T
A
–40 85 °C
Operating junction temperature, T
J
–40 125 °C
Storage temperature, T
stg
–65 150 °C
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.2 ESD Ratings
VALUE UNIT
V
(ESD)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001
(1)
±1000
V
Charged-device model (CDM), per JEDEC specification JESD22-C101
(2)
±250
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
Operating ambient temperature, T
A
–40 85 °C
Operating junction temperature, T
J
–40 125 °C
(1) For more information about traditional and new thermal metrics, see Semiconductor and IC Package Thermal Metrics.
6.4 Thermal Information
THERMAL METRIC
(1)
LM27762
UNITDSS (WSON)
12 PINS
R
θJA
Junction-to-ambient thermal resistance 62.2 °C/W
R
θJC(top)
Junction-to-case (top) thermal resistance 54.7 °C/W
R
θJB
Junction-to-board thermal resistance 25.6 °C/W
ψ
JT
Junction-to-top characterization parameter 1.8 °C/W
ψ
JB
Junction-to-board characterization parameter 25.6 °C/W
R
θJC(bot)
Junction-to-case (bottom) thermal resistance 9.2 °C/W
5
LM27762
www.ti.com.cn
ZHCSFJ0B –AUGUST 2016–REVISED FEBRUARY 2017
版权 © 2016–2017, Texas Instruments Incorporated
(1) When VIN = 5.5V charge pump may enter PWM mode in hot conditions.
6.5 Electrical Characteristics
Typical limits apply for T
A
= 25°C; minimum and maximum limits apply over the full temperature range. Unless otherwise
specified V
IN
= 5 V, C
IN
= C
OUT+
= C
OUT–
= 2.2 μF, C
1
= 1 μF, C
POUT
= 4.7 μF.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
Q
Supply current
Open circuit, no load, EN+, EN–
connected to VIN.
(1)
390 µA
I
SD
Shutdown supply current 0.5 5 µA
ƒ
SW
Switching frequency V
IN
= 3.6 V 1.7 2 2.3 MHz
R
NEG
Output resistance to C
POUT
V
IN
= 5.5 V, I
L
= 100 mA 2.5 Ω
V
LDO–
LDO dropout voltage I
L
= 100 mA, V
OUT–
= −5 V 30 mV
PSRR Power supply rejection ratio, OUT– I
L
= 100 mA, V
OUT–
= −1.8 V, 10 kHz 50 dB
V
N
– Output noise voltage I
L
= 80 mA, 10 Hz to 100 kHz 22 µV
RMS
V
FB–
Feedback pin reference voltage –1.238 –1.22 –1.202 V
V
OUT–
Adjustable output voltage 5.5 V ≥ V
IN
≥ 2.7 V –5 –1.5 V
Load regulation 0 to 250 mA, V
OUT
= –1.8 V 34 µV/mA
Line regulation 5 V ≥ V
IN
≥ 2.7 V, I
L
= 50 mA 1.5 mV/V
V
LDO+
LDO dropout voltage I
L
= 100 mA, V
OUT
= 5 V 45 mV
PSRR Power supply rejection ratio, OUT+ I
L
= 100 mA, V
OUT+
= 1.8 V, 10 kHz 43 dB
V
N+
Output noise voltage I
L
= 80 mA, 10 Hz to 100 kHz 22 µV
RMS
V
FB+
Feedback pin reference voltage 1.182 1.2 1.218 V
V
OUT+
Adjustable output voltage 5.5 V ≥ V
IN
≥ 2.7 V 1.5 5 V
Load regulation 0 to 250 mA, V
OUT
= 1.8 V 11 µV/mA
Line regulation 5 V ≥ V
IN
≥ 2.7 V, I
L
= 50 mA 1.9 mV/V
V
IH
Enable pin input voltage high 5.5 V ≥ V
IN
≥ 2.7 V 1.2 V
V
IL
Enable pin input voltage low 5.5 V ≥ V
IN
≥ 2.7 V 0.4 V
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