TPS621351RGXR

Product Folder Order Now Support & Community Tools & Software Technical Documents TPS62135, TPS621351 SLVSBH3B – JUNE 2016 – REVISED APRIL 2017 TPS62135, TPS621351 High Accuracy 3-V to 17-V 4-A Step-Down Converters with DCS-Control™ 1 Features 3 Description • • • • • • • The TPS62135 and TPS621351 are high efficiency and easy to use synchronous step-down DC-DC converters, based on the DCS-Control™ Topology. The devices wide input voltage range of 3-V to 17-V makes it suitable for multi-cell Li-Ion as well as 12-V intermediate supply rails. The devices provide 4-A continuous output current. The TPS62135 automatically enters Power Save Mode at light loads to maintain high efficiency across the whole load range. With that, the device is well suited for applications that require connected standby performance, like ultra low power computers. With the MODE pin set to low, the switching frequency of the device is adapted automatically based on the input and output voltage. This technique is called Automatic Efficiency Enhancement (AEE™) and maintains high conversion efficiency over the whole operation range. It provides a 1% output voltage accuracy in PWM mode and therefore enables the design of a power supply with high output voltage accuracy. 1 • • • • • • • • Output Voltage Accuracy ± 1% (PWM mode) Input Voltage Range: 3 V to 17 V Quiescent Current 18 µA Typ Output Voltage from 0.8 V to 12 V Adjustable Soft-Start Forced PWM or PWM/PFM operation Typical switching frequency of 2.5MHz in forced PWM Precise ENABLE input allows – User-Defined Undervoltage Lockout – Exact Sequencing 100% Duty Cycle Mode Automatic Efficiency Enhancement AEE™ DCS-Control™ Topology Available with Active Output Discharge Optional HICCUP Overcurrent Protection Power Good Output Available in 3-mm x 2-mm VQFN Package 2 Applications • • • • • Standard 12-V Rail Supplies POL for Connected Standby Requirements POL Supply from Single or Multiple Li-Ion Battery Gaming Consoles, SSD Drives Mobile and Embedded Computers The device has a typical quiescent current of 18 µA. In shutdown mode the current is typically 1 µA and the output is actively discharged for TPS62135 while the output voltage discharge feature is disabled in TPS621351. The TPS62135 is available as an adjustable version, packaged in a 3-mm x 2-mm VQFN package. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) TPS62135 VQFN 3.00 mm x 2.00 mm TPS621351 VQFN 3.00 mm x 2.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. space Efficiency vs Output Current for Vo = 3.3 V Simplified Schematic TPS62135 VIN 10uF EN 1 uH 100 VOUT = 0.8V to 12V 90 SW 80 VOS R1 FB R2 70 22uF Efficiency (%) VBAT = 3.0V to 17V 60 50 VSEL PG MODE FB2 30 SS/TR GND 20 VIN = 4 V VIN = 5 V VIN = 6 V VIN = 8 V VIN = 10 V VIN = 12 V VIN = 15 V 40 10 Copyright © 2016, Texas Instruments Incorporated 0 1E-5 0.0001 0.001 0.01 IOUT (A) 0.1 1 4 D001 1 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. TPS62135, TPS621351 SLVSBH3B – JUNE 2016 – REVISED APRIL 2017 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Device Comparison Table..................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 3 4 7.1 7.2 7.3 7.4 7.5 7.6 4 4 4 5 5 7 Absolute Maximum Ratings ...................................... ESD Ratings.............................................................. Recommended Operating Conditions....................... Thermal Information ................................................. Electrical Characteristics........................................... Typical Characteristics .............................................. 8 Parameter Measurement Information .................. 7 9 Detailed Description .............................................. 8 8.1 Schematic ................................................................. 7 9.1 Overview ................................................................... 8 9.2 Functional Block Diagram ......................................... 8 9.3 Feature Description................................................... 9 9.4 Device Functional Modes........................................ 10 10 Application and Implementation........................ 13 10.1 Application Information.......................................... 13 10.2 Typical Applications ............................................. 16 10.3 System Examples ................................................. 32 11 Power Supply Recommendations ..................... 36 12 Layout................................................................... 36 12.1 Layout Guidelines ................................................. 36 12.2 Layout Example .................................................... 36 12.3 Thermal Considerations ........................................ 37 13 Device and Documentation Support ................. 38 13.1 13.2 13.3 13.4 13.5 13.6 13.7 Device Support .................................................... Receiving Notification of Documentation Updates Related Links ........................................................ Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 38 38 38 38 38 38 38 14 Mechanical, Packaging, and Orderable Information ........................................................... 39 4 Revision History Changes from Revision A (September 2016) to Revision B Page • Deleted table note from Device Comparison Table ............................................................................................................... 3 • Changed Figure 6 to Figure 30 ........................................................................................................................................... 17 • Added Figure 72 .................................................................................................................................................................. 28 • Added Figure 74 .................................................................................................................................................................. 28 • Added Figure 76 .................................................................................................................................................................. 28 • Added Figure 78 .................................................................................................................................................................. 29 • Added Figure 80 .................................................................................................................................................................. 29 • Added Figure 81 .................................................................................................................................................................. 29 • Added Figure 82 .................................................................................................................................................................. 30 Changes from Original (June 2016) to Revision A • 2 Page Changed from Product Preview to Production Data .............................................................................................................. 1 Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated Product Folder Links: TPS62135 TPS621351 TPS62135, TPS621351 www.ti.com SLVSBH3B – JUNE 2016 – REVISED APRIL 2017 5 Device Comparison Table DEVICE NUMBER FEATURES OUTPUT VOLTAGE MARKING TPS62135RGX nominal switching frequency = 2.5 MHz output voltage discharge voltage selection input / output VSEL/FB2 HICCUP current limit adjustable 62135 TPS621351RGX voltage selection input / output VSEL/FB2 nominal switching frequency = 2.5 MHz adjustable 621351 TPS62136RGX nominal switching frequency = 1 MHz output voltage discharge voltage selection input / output VSEL/FB2 HICCUP current limit adjustable see the TPS62136 data sheet TPS621361RGX nominal switching frequency = 1 MHz voltage selection input / output VSEL/FB2 adjustable see the TPS621361 data sheet 6 Pin Configuration and Functions RGX Package 11-Pin VQFN bottom view top view 8 7 EN PG SS/TR VOS 9 10 6 VIN SW 5 GND MODE 7 4 VSEL FB 2 1 2 EN VOS SS/TR 6 9 5 FB 11 8 PG GND SW VIN 10 FB MODE FB 2 VSEL 4 11 3 3 2 1 Pin Functions PIN NAME NUMBER I/O DESCRIPTION EN 8 I This is the enable pin of the device. Connect to logic low to disable the device. Pull high to enable the device. Do not leave this pin unconnected. FB 5 I Voltage feedback input, connect resistive output voltage divider to this pin. FB2 4 O Open drain of an internal switch to GND. Allows to turn on a resistor in parallel to the feedback resistor R2 and increase the output voltage with VSEL = high. GND 3 MODE 10 I The device runs in PFM/PWM mode when this pin is pulled low. When the pin is pulled high, the device runs in forced PWM mode. Do not leave this pin unconnected. PG 7 O Open drain power good output. SS/TR 9 I Soft-Start / Tracking pin. An external capacitor connected from this pin to GND defines the rise time for the internal reference voltage. The pin can also be used as an input for tracking and sequencing - see Detailed Description section in this document. SW 2 This is the switch pin of the converter and is connected to the internal Power MOSFETs. VIN 1 Power supply input. Make sure the input capacitor is connected as close as possible between pin VIN and GND. VOS 6 I Output voltage sense pin. Connect directly to the positive pin of the output capacitor. VSEL 11 I Voltage scaling control input. Turns on an internal switch from FB2 to GND when this pin is set high. Ground pin. Copyright © 2016–2017, Texas Instruments Incorporated Product Folder Links: TPS62135 TPS621351 Submit Documentation Feedback 3 TPS62135, TPS621351 SLVSBH3B – JUNE 2016 – REVISED APRIL 2017 www.ti.com 7 Specifications 7.1 Absolute Maximum Ratings MIN MAX UNIT VIN -0.3 20 V SW, VOS -0.3 VIN+0.3 V -2 25.5 V -0.3 VIN+0.3 V Operating junction temperature, TJ -40 150 °C Storage temperature range, Tstg -65 150 °C Pin voltage range (2) SW (transient for t