Output Current (mA)
E f f i c i e n c y (%)
0.001
0.01
0.1
1101001000
C 10
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TPS62740,TPS62742
ZHCS342B –NOVEMBER 2013–REVISED JULY 2014
TPS6274x 针对低功耗应用的360nA I Q 降压转换器
1特性
3说明
•输入电压(V IN )范围：2.2V 至5.5V TPS6274x 是业界第一款降压转换器，此转换器特有典型值为360nA 的静态电流，并且搭配微型2.2µH 电感•典型值360nA 静态电流 和10µF 输出电容一起工作。这款基于DCS-•10µA 输出电流时的效率高达90%Control™的全新器件将轻负载效率范围扩展至10µA • 高达300mA/400mA 的输出电流(TPS62740/TPS62742)
负载电流以下。TPS62740支持高达300mA 的输出•射频(RF)友好型DCS-Control TM 电流，TPS6274
点子通2支持高达400mA 的输出电流。此•高达2MHz 的开关频率器件由可再充电锂离子电池，锂化学电池（例如锂亚硫•低输出纹波电压 酰氯(Li-SOC12)，锂锰电池(Li-MnO2)和两节或三节• 1.8V 至3.3V 之间16个可选输出电压（步长碱性电池）供电运行。输入电压范围高达5.5V ，也实100mV ）
现由1个USB 端口和薄膜太阳能模块供电运行。用•自动转换至无纹波100%模式户可使用4个VSEL 引脚在1.8V 至3.3V 范围内选择•转换率受控的负载开关
输出电压（步长100mV ）。TPS6274x 搭配使用小型•VOUT /LOAD 上的放电功能输出电容，特有低输出纹波电压和低噪声。一旦电池•电源正常输出
电压接近输出电压（接近100%占空比），此器件进•针对与微型2.2µH 电感器和10µF C OUT 的共同运入无纹波100%模式运行，以防止输出纹波电压的增行进行了优化
加。然后，此器件停止开关，并且输出被连接至输入•总体解决方案尺寸<31mm 2
电压。集成转换率受控负载开关特有典型值为0.6Ω•
小型2mm x 3mm 2晶圆级小外形无引线(WSON)的导通电阻，并且将选择的输出电压分配至临时使用的封装 子系统。TPS6274采用小型12引脚2mm x 3mm 2WSON 封装，并且支持31mm 2的总体解决方案尺2应用范围
寸。
•Bluetooth ®低功耗(Low Energy)，消费类电子产品用射频(RF4CE)，短距离低功耗通信技术(Zigbee)器件信息(1)
•工业用仪表计量器件型号封装
封装尺寸（标称值）•
能量采集
换面鞋磁流变阻尼器TPS62740WSON
3.00mm x 2.00mm
TPS62742
(1)要了解所有可用封装，请见数据表末尾的可订购产品附录。
4典型应用
TPS62740,TPS62742
ZHCS342B–NOVEMBER2013–REVISED JULY2014www.ti
目录
9.3Feature Description (8)
1特性 (1)
9.4Device Functional Modes (10)
2应用范围 (1)
10Application and Implementation (12)
3说明 (1)
10.1Application Information (12)
4典型应用 (1)
10.2Typical Application (12)
5修订历史记录 (2)
10.3System Example (22)
6Device Comparison Table (3)
11Power Supply Recommendations (23)
7Pin Configuration and Functions (3)
12Layout (23)
8Specifications (4)
12.1Layout Guidelines (23)
8.1Absolute Maximum Ratings (4)
12.2Layout Example (23)
8.2Handling Ratings (4)
13器件和文档支持 (24)
8.3Recommended Operating Conditions (5)
13.1器件支持 (24)
8.4Thermal Information (5)
13.2文档支持 (24)
8.5Electrical Characteristics (5)
13.3相关链接 (24)
8.6Typical Characteristics (7)
13.4商标 (24)
9Detailed Description (8)
13.5静电放电警告 (24)
9.1Overview (8)
13.6术语表 (24)
9.2Functional Block Diagram (8)
14机械封装和可订购信息 (24)
5修订历史记录
NOTE:Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A(November2013)to Revision B Page •已添加TPS62742器件 (1)
•Added efficiency graph,Figure11 (15)
SW
GND EN
DSS PACKAGE
(TOP VIEW) CTRL TPS62740,TPS62742
www.ti ZHCS342B–NOVEMBER2013–REVISED JULY2014 6Device Comparison Table
PACKAGE
OUTPUT CURRENT T A PART NUMBER OUTPUT VOLTAGE SETTING VSEL1-4
[mA]MARKING TPS62740 1.8V to3.3V in100mV steps300mA62740–40°C to85°C TPS62741(1) 1.3V to2.8V in100mV steps300mA-/-TPS62742 1.8V to3.3V in100mV steps400mA62742
(1)Device option,contact TI for more details
7Pin Configuration and Functions
WSON PACKAGE
12-Pin
Pin Functions
PIN仿形切割机
I/O DESCRIPTION
NAME NO
VIN1PWR V IN power supply pin.Connect this pin close to the VIN terminal of the input capacitor.A ceramic capacitor of4.7µF is required.
SW2OUT This is the switch pin and is connected to the internal MOSFET switches.Connect the inductor to this
terminal.
GND3PWR GND supply pin.Connect this pin close to the GND terminal of the input and output capacitor.
CTRL4IN This pin controls the output LOAD pin.With CTRL=low,the output LOAD is disabled.This pin must be
terminated.
VOUT5IN Feedback pin for the internal feedback divider network and regulation loop.An internal load switch is
connected between this pin and the LOAD pin.Connect this pin directly to the output capacitor with a short
毛发湿度计trace.
LOAD6OUT This output is controlled by the CTRL Pin.With CTRL high,an internal load switch connects the LOAD pin
to the VOUT pin.The LOAD pin allows to connect/disconnect other system components to the output of
the DC/DC converter.This pin is pulled to GND with CTRL pin=low.The LOAD pin features a soft
switching.If not used,leave the pin open.
PG7OUT Power good open drain output.This pin is high impedance to indicate"Power Good".Connect a external
pull up resistor to generate a"high"level.If not used,this pin can be left open.
VSEL48IN Output voltage selection pins.See Table1for V OUT selection.These pins must be terminated and can be
changed during operation.
VSEL39IN
VSEL210IN
VSEL111IN
EN12IN High level enables the devices,low level turns the device into shutdown mode.This pin must
be
terminated.
EXPOSED NC Not electrically connected to the IC,but must be soldered.Connect this pad to GND and use it as a central THERMAL PAD GND plane.
TPS62740,TPS62742
ZHCS342B–NOVEMBER2013–REVISED JULY2014www.ti
Table1.Output Voltage Setting
Device VOUT VSEL4VSEL3VSEL2VSEL1
1.80000
1.90001
2.00010
2.10011
2.20100
2.30101
2.40110
2.50111
TPS62740/42
2.61000
2.71001
2.81010
2.91011
3.01100
3.11101
3.21110
3.31111
8Specifications
8.1Absolute Maximum Ratings(1)
Over operating free-air temperature range(unless otherwise noted)
MIN MAX UNIT VIN–0.36V
SW(3)–0.3V IN+0.3V V Pin voltage(2)EN,CTRL,VSEL1-4–0.3V IN+0.3V V PG–0.3V IN+0.3V V
VOUT,LOAD–0.3 3.7V PG pin I PG sink current10mA Maximum operating junction temperature,T J–40150°C (1)Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device.These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied.Exposure to absolute–maximum–rated conditions for extended periods may affect device reliability.
(2)All voltage values are with respect to network ground terminal GND.
(3)The MAX value V IN+0.3V applies for applicative operation(device switching),DC voltage applied to this pin may not exceed4V
8.2Handling Ratings
MIN MAX UNIT
T stg Storage temperature range–65150°C
Human body model(HBM),per ANSI/ESDA/JEDEC JS-001,all2000
pins(1)
V(ESD)Electrostatic discharge V
Charged device model(CDM),per JEDEC specification1000
JESD22-C101,all pins(2)
(1)JEDEC document JEP155states that500-V HBM allows safe manufacturing with a standard ESD control process.The human body
model is a100-pF capacitor discharged through a1.5-kΩresistor into each pin.
冷轧辊
(2)JEDEC document JEP157states that250-V CDM allows safe manufacturing with a standard ESD control process.
TPS62740,TPS62742 www.ti ZHCS342B–NOVEMBER2013–REVISED JULY2014
8.3Recommended Operating Conditions
MIN NOM MAX UNIT V IN Supply voltage V IN(1) 2.2 5.5V
V OUTnom+0.7V≤V IN≤5.5V TPS62740300
I OUT+
Device output current(sum of I OUT and I LOAD)3V≤V IN,V OUTnom+0.7V≤V IN≤5.5V TPS62742400
I LOAD mA
V OUTnom≤V IN≤V OUTnom+0.7V100
I LOAD Load current(current from LOAD pin)100
L Inductance 1.5 2.2 3.3µH
C OUT Output capacitance connected to VOUT pin(not including LOA
D pin)22
µF C LOAD Capacitance connected to LOAD pin10
T J Operating junction temperature range-40125
°C T A Ambient temperature range-4085
(1)The minimum required supply voltage for startup is2.15V(undervoltage lockout threshold V TH_UVLO+).The device is functional down to
2V supply voltage(falling undervoltage lockout threshold V TH_UVLO-).
8.4Thermal Information
THERMAL METRIC DSS/12PINS UNIT
RθJA Junction-to-ambient thermal resistance61.8
RθJCtop Junction-to-case(top)thermal resistance70.9
RθJB Junction-to-board thermal resistance25.7
°C/W
ψJT Junction-to-top characterization parameter 1.9
ψJB Junction-to-board characterization parameter25.7
RθJCbot Junction-to-case(bottom)thermal resistance7.2
8.5Electrical Characteristics
V IN=3.6V,T A=–40°C to85°C typical values are at T A=25°C(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY
V IN Input voltage 2.2 5.5V range
EN=V IN,CTRL=GND,I OUT=0µA,V OUT=1.8V,device not switching,3601800
nA Operating
I Q EN=V IN,I OUT=0mA,CTRL=GND,V OUT=1.8V,device switching460
quiescent current
EN=V IN,I OUT=0mA.,CTRL=V IN,V OUT=1.8V,device not switching12.5µA
I SD Shutdown current EN=GND,shutdown current into V IN701000
nA
EN=GND,shutdown current into V IN,T A=60°C150450
V TH_UVLO+Undervoltage Rising V IN 2.075 2.15
V lockout threshold
V TH_UVLO-Falling V IN 1.9252
INPUTS EN,CTRL,VSEL1-4
V IH TH High level input 2.2V≤V IN≤5.5V 1.1V threshold
V IL TH Low level input 2.2V≤V IN≤5.5V0.4V threshold
I IN Input bias Current T A=25°C10nA
T A=–40°C to85°C25
POWER SWITCHES
High side
MOSFET on-0.60.85
resistance
R DS(ON)V IN=3.6V,I OUT=50mAΩLow Side
MOSFET on-0.360.5
resistance
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