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  • TPS6112x Synchronous Boost Converter With 1.1-A Switch and Integrated LDO

    • SLVS427D JUNE   2002  – May 2015 TPS61120 , TPS61121 , TPS61122

      PRODUCTION DATA.  

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  • TPS6112x Synchronous Boost Converter With 1.1-A Switch and Integrated LDO
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Options
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Controller Circuit
      2. 9.3.2 Synchronous Rectifier
      3. 9.3.3 LDO
      4. 9.3.4 Device Enable
        1. 9.3.4.1 Undervoltage Lockout
        2. 9.3.4.2 Softstart
      5. 9.3.5 LDO Enable
      6. 9.3.6 Power Good
      7. 9.3.7 Low Battery Detector Circuit—LBI/LBO
      8. 9.3.8 Low-EMI Switch
    4. 9.4 Device Functional Modes
      1. 9.4.1 Power Save Mode
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Solution for Maximum Output Power
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Programming the Output Voltage
            1. 10.2.1.2.1.1 DC-DC Converter
            2. 10.2.1.2.1.2 LDO
          2. 10.2.1.2.2 Programming the LBI/LBO Threshold Voltage
          3. 10.2.1.2.3 Inductor Selection
          4. 10.2.1.2.4 Capacitor Selection
            1. 10.2.1.2.4.1 Input Capacitor
            2. 10.2.1.2.4.2 Output Capacitor DC-DC Converter
              1. 10.2.1.2.4.2.1 Small Signal Stability
            3. 10.2.1.2.4.3 Output Capacitor LDO
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Low Profile Solution, Maximum Height 1.8 mm
      3. 10.2.3 Dual Power Supply With Auxiliary Positive Output Voltage
      4. 10.2.4 Dual Power Supply With Auxiliary Negative Output Voltage
      5. 10.2.5 Single Output Using LDO as Filter
      6. 10.2.6 Dual Input Power Supply Solution
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
    3. 12.3 Thermal Considerations
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Community Resources
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information
  15. IMPORTANT NOTICE
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DATA SHEET

TPS6112x Synchronous Boost Converter With 1.1-A Switch and Integrated LDO

1 Features

  • Synchronous, 95% Efficient, Boost Converter With 500-mA Output Current From 1.8-V Input
  • Integrated 200-mA Reverse Voltage Protected LDO for DC-DC Output Voltage Post Regulation or Second Output Voltage
  • 40-µA (Typical) Total Device Quiescent Current
  • Input Voltage Range: 1.8 V to 5.5 V
  • Fixed and Adjustable Output Voltage Options up to 5.5 V
  • Power Save Mode for Improved Efficiency at Low Output Power
  • Low Battery Comparator
  • Power Good Output
  • Low EMI-Converter (Integrated Antiringing Switch)
  • Load Disconnect During Shutdown
  • Overtemperature Protection
  • Available in a Small 4-mm × 4-mm VQFN-16 or in a TSSOP-16 Package

2 Applications

  • All Single Cell Li or Dual Cell Battery or USB Powered Products as MP-3 Player, PDAs, and Other Portable Equipment
  • Dual Input or Dual Output Mode
  • Simple Li-Ion to 3.3-V Conversion

Typical Application Schematic

TPS61120 TPS61121 TPS61122 FSD_LVS427.gif

3 Description

The TPS6112x devices provide a complete power supply solution for products powered by either a one-cell Li-Ion or Li-Polymer by either a one-cell Li-Ion or Li-Polymer battery, or a two- to four-cell Alkaline, NiCd, or NiMH battery. The devices can generate two stable output voltages that are either adjusted by an external resistor divider or are fixed internally on the chip. The device also provides a simple solution for generating 3.3 V out of a one-cell Li-Ion or Li-Polymer battery at a maximum output current of at least 200 mA with supply voltages down to 1.8 V. The implemented boost converter is based on a fixed frequency, pulse-width-modulation (PWM) controller using a synchronous rectifier to obtain maximum efficiency. The maximum peak current in the boost switch is limited to a value of 1600 mA.

The converter can be disabled to minimize battery drain. During shutdown, the load is completely disconnected from the battery. A low-EMI mode is implemented to reduce ringing and, in effect, lower radiated electromagnetic energy when the converter enters discontinuous conduction mode. A power good output at the boost stage simplifies control of any connected circuits like cascaded power supply stages or microprocessors.

The built-in LDO can be used for a second output voltage derived either from the boost output or directly from the battery. The LDO can be enabled separately that is, using the power good of the boost stage. The device is packaged in a 16-pin VQFN (RSA) package measuring 4 mm x 4 mm or in a 16-pin TSSOP (PW) package.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS61120 TSSOP (16) 5.00 mm × 4.40 mm
VQFN (16) 4.00 mm × 4.00 mm
TPS61121 TSSOP (16) 5.00 mm × 4.40 mm
TPS61122
  1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Revision History

Changes from C Revision (April 2004) to D Revision

  • Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go

5 Device Options

Table 1. Available Output Voltage Options(1)

PART NUMBER(2) OUTPUT VOLTAGE DC-DC OUTPUT VOLTAGE LDO
TPS61120PW Adjustable Adjustable
TPS61121PW 3.3 V 1.5 V
TPS61122PW 3.6 V 3.3 V
TPS61120RSA Adjustable Adjustable
TPS61121RSA 3.3 V 1.5 V
(1) Contact the factory to check availability of other fixed output voltage versions.
(2) The packages are available taped and reeled. Add R suffix to device type (for example TPS61120PWR or TPS61120RSAR) to order quantities of 2000 devices per reel for the TSSOP (PW) package and 3000 devices per reel for the QFN (RSA) package.

6 Pin Configuration and Functions

PW Package
16-Pin TSSOP
Top View
TPS61120 TPS61121 TPS61122 PO_LVS427.gif
RSA Package
16-Pin VQFN With Thermal Pad
Top View
TPS61120 TPS61121 TPS61122 PO1_LVS427.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
TSSOP VQFN
EN 7 5 I DC-DC-enable input. (1: VBAT enabled, 0: GND disabled)
FB 15 13 I DC-DC voltage feedback of adjustable versions
GND 12 10 I/O Control/logic ground
LBI 5 3 I Low battery comparator input (comparator enabled with EN)
LBO 13 11 O Low battery comparator output (open drain)
LDOEN 8 6 I LDO-enable input (1: LDOIN enabled, 0: GND disabled)
LDOOUT 10 8 O LDO output
LDOIN 9 7 I LDO input
LDOSENSE 11 9 I LDO feedback for voltage adjustment, must be connected to LDOOUT at fixed output voltage versions
SWP 1 15 I DC-DC rectifying switch input
PGND 3 1 I/O Power ground
PGOOD 14 12 O DC-DC output power good (1: good, 0 : failure) (open drain)
SKIPEN 6 4 I Enable/disable power save mode (1: VBAT enabled, 0: GND disabled)
SWN 2 16 I DC-DC switch input
VBAT 4 2 I Supply pin
VOUT 16 14 O DC-DC output

 
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