ZHCSE11A June   2015  – June 2015 TPS62745 , TPS627451

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 典型应用电路原理图
  5. 5 修订历史记录
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Characteristics
    7. 8.7 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 DCS-Control™
      2. 9.3.2 Enable / Shutdown
      3. 9.3.3 Power Good Output (PG)
      4. 9.3.4 Output Voltage Selection (VSEL1 - 4)
      5. 9.3.5 Input Voltage Switch
    4. 9.4 Device Functional Modes
      1. 9.4.1 Soft Start
    5. 9.5 VOUT Discharge
    6. 9.6 Internal Current Limit
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Output Voltage Selection (VSEL1 - 4)
        2. 10.2.2.2 Output Filter Design (Inductor and Output Capacitor)
        3. 10.2.2.3 Inductor Selection
        4. 10.2.2.4 DC/DC Output Capacitor Selection
        5. 10.2.2.5 Input Capacitor Selection
      3. 10.2.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 TPS62745 Set to a Fixed Voltage of 3.3 V
        1. 10.3.1.1 Design Requirements
        2. 10.3.1.2 Detailed Design Procedure
        3. 10.3.1.3 Application Curves
      2. 10.3.2 Dynamic Voltage Change on TPS62745
        1. 10.3.2.1 Design Requirements
        2. 10.3.2.2 Detailed Design Procedure
        3. 10.3.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13器件和文档支持
    1. 13.1 器件支持
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 相关链接
    3. 13.3 社区资源
    4. 13.4 商标
    5. 13.5 静电放电警告
    6. 13.6 Glossary
  14. 14机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8 Specifications

8.1 Absolute Maximum Ratings

Over operating free-air temperature range (unless otherwise noted) (1)
PIN MIN MAX UNIT
Voltage VIN –0.3 12 V
SW, VIN_SW(2) –0.3 VIN +0.3 V
EN –0.3 VIN +0.3 V
EN_VIN_SW, VSEL1-4 –0.3 6 V
PG –0.3 6 V
VOUT –0.3 3.6 V
Power Good Sink Current PG 10 mA
VIN Switch Output Current VIN_SW 10 mA
Junction temperature, TJ –40 150 °C
Storage temperature, Tstg –65 150 °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) The DC voltage on the SW pin must not exceed 3.6 V

8.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) ±2000 V
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) ±500
(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.

8.3 Recommended Operating Conditions

Over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
Supply voltage VIN 3.3 10 V
Output current IOUT VOUT + 0.7 V ≤ VIN ≤ 10 V 300 mA
Effective inductance 2.8 4.7 6.2 µH
Capacitance connected to VIN pin 3 10 µF
Total effective capacitance connected to VOUT pin (1) 5 10 22 µF
Operating junction temperature range, TJ –40 125 °C
Operating ambient temperature range, TA –40 85 °C
(1) Due to the DC bias effect of ceramic capacitors, the effective capacitance is lower then the nominal value when a voltage is applied. This is why the capacitance is specified to allow the selection of the smallest capacitor required with the DC bias effect for this type of capacitor in mind. The nominal value given matches a typical capacitor to be chosen to meet the minimum capacitance required.

8.4 Thermal Information

THERMAL METRIC(1) TPS62745 UNIT
DSS
12 PINS
RθJA Junction-to-ambient thermal resistance 61.8 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 70.9 °C/W
RθJB Junction-to-board thermal resistance 25.7 °C/W
ψJT Junction-to-top characterization parameter 1.9 °C/W
ψJB Junction-to-board characterization parameter 25.7 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 7.2 °C/W
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

8.5 Electrical Characteristics

VIN = 6 V, TJ = –40°C to 125°C typical values are at TJ = 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY
VIN Input voltage range VOUT + 0.7 V ≤ VIN ≤ 10 V ; min 3.3 V, whichever value is higher 3.3 10 V
IQ Operating quiescent current EN = VIN, device not switching; IOUT = 0 µA;
VOUT = 2 V; TJ = –40°C to 85°C		 400 1960 nA
ISD Shutdown current EN = GND, shutdown current into VIN;
TJ = -40°C to 85°C		 130 1200 nA
EN = GND, shutdown current into VIN; TJ = 60°C 830
VTH_UVLO+ Undervoltage lockout threshold Rising VIN; TJ = –40°C to 85°C 3.1 3.3 V
VTH_UVLO- Falling VIN; TJ = –40°C to 85°C 2.9 3.1
INPUTS (EN, EN_VIN_SW, VSEL1-4)
VIH TH High level input voltage VTH_UVLO- ≤ VIN ≤ 10 V 1.2 V
VIL TH Low level input voltage VTH_UVLO- ≤ VIN ≤ 10 V 0.35 V
IIN Input bias current; except EN pin TJ = 25°C 10 nA
TJ = 60°C 20
TJ = –40°C to 85°C 50
IIN Input bias current for EN pin TJ = 25°C 20 nA
TJ = 60°C 40
TJ = –40°C to 85°C 100
POWER SWITCHES
RDS(ON) High side MOSFET on-resistance VIN = 4 V, I = 140 mA 0.6 0.98 Ω
Low side MOSFET on-resistance 0.5 0.85
ILIMF High side MOSFET DC switch current limit 3.6 V ≤ VIN ≤ 10 V; device not in soft start 480 600 720 mA
Low side MOSFET DC switch current limit 600
OUTPUT DISCHARGE SWITCH (VOUT)
RDSCH_VOUT MOSFET on-resistance EN = GND, IOUT = –10 mA into VOUT pin 25 60 Ω
IIN_VOUT Bias current into VOUT pin(1) EN = VIN, VOUT = 2 V TJ = 25°C 40 100 nA
TJ = –40°C to 85°C 500
INPUT VOLTAGE SWITCH (VIN_SW)
RDS(ON) MOSFET on-resistance EN_VIN_SW = High, IVIN_SW = 1 mA 85 160 Ω
IVIN_SW_LKG VIN-switch leakage current EN_VIN_SW = GND; leakage from VIN to VIN_SW when pulled to GND; TJ = –40°C to 85°C -20 20 nA
IVIN_SW VIN-switch current 5 mA
POWER GOOD OUTPUT (PG)
VTH_PG+ Power good threshold voltage Rising output voltage on VOUT pin 95 97.5 %
VTH_HYS Power good threshold hysteresis Falling output voltage on VOUT pin 3
VOL Low level output threshold 3.3 V ≤ VIN ≤ 10 V, EN = GND,
current into PG pin IPG = 4 mA		 0.3 V
VOH High level output threshold 3.3 V ≤ VIN ≤ 10 V, EN = high,
current into PG pin IPG = 0 mA		 6 V
IIN_PG Bias current into power good pin PG pin is high impedance, VOUT = 2 V,
EN = VIN, IOUT = 0 mA; TJ = –40°C to 85°C		 20 nA
OUTPUT
ILIM_softstart Switch current limit during soft start Current limit is reduced during soft start,
TJ = –40°C to 85°C		 40 110 180 mA
VVOUT Output voltage range For TPS627450; output voltages are selected with pins VSEL1 - 4 1.8 3.3 V
For TPS627451; output voltages are selected with pins VSEL1 - 4 1.3 2.8
Output voltage accuracy PFM mode, IOUT = 0 mA, VOUT + 0.6 V ≤ VIN ≤ 10 V; min 3.3 V, whichever value is higher;
TJ = –40°C to 85°C		 -2.5 0 2.5 %
PWM Mode, VOUT + 0.7 V ≤ VIN ≤ 10 V; min 3.3 V, whichever value is higher; TJ = –40°C to 85°C –2 0 2
DC output voltage load regulation VOUT = 2.0 V; IOUT = 2 mA to 80 mA (PFM mode) 0.005 %/mA
DC output voltage load regulation VOUT = 2.0 V; IOUT = 150 mA to 300 mA (PWM mode) 0.001 %/mA
DC output voltage line regulation VOUT = 2.0 V, IOUT = 300 mA, 4 V ≤ VIN ≤ 10 V 0.015 %/V
(1) A 50-MΩ (typical) internal resistor divider is internally connected to the VOUT pin

8.6 Timing Characteristics

VIN = 6 V, TJ = –40°C to 125°C typical values are at TJ = 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY
tdelay UVLO delay time response time of UVLO circuit 200 µs
INPUT VOLTAGE SWITCH (VIN_SW)
tVIN_SW VIN-switch turn-on settling time Time from EN_VIN_SW = High until RDS(ON) is within specification 100 µs
POWER GOOD OUTPUT (PG)
tdelay PGOOD delay time Response time of PGOOD circuit; falling edge 200 µs
OUTPUT
tONmin Minimum ON time VIN = 6 V, VOUT = 2.0 V, IOUT = 0 mA 256 ns
tOFFmin Minimum OFF time VIN = 3.3 V 50 ns
tStart Regulator start up time VIN = 6 V, from transition EN = Low to High until device starts switching, TJ = -40°C to 85°C 15 50 ms
tSoftstart Softstart time with reduced switch current limit 3.3 V ≤ VIN ≤ 10 V, EN = VIN 700 µs

8.7 Typical Characteristics

TPS62745 TPS627451 A38_TPS62745_Iq_vs_Vin.gif
EN = VIN, VOUT = 1.8 V, EN_VIN_SW = GND Device Not Switching
Figure 1. Quiescent Current
TPS62745 TPS627451 A37_TPS62745_HSDrdson.gif
Figure 3. RDS(ON) High-Side MOSFET
TPS62745 TPS627451 A39_TPS62745_Isd_vs_Vin.gif
EN = GND, EN_VIN_SW = GND
Figure 2. Shutdown Current
TPS62745 TPS627451 A40_ATPS62745_LSDrdson.gif
Figure 4. RDS(ON) Low-Side MOSFET
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