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  • TPS62410 2.25-MHz 2 x 800-mA Dual Step-Down Converter in Small 3 × 3 mm VSON Package

    • SLVS737A February   2007  – July 2015 TPS62410

      PRODUCTION DATA.  

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  • TPS62410 2.25-MHz 2 x 800-mA Dual Step-Down Converter in Small 3 × 3 mm VSON Package
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Dissipation Ratings
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
      1. 7.1.1 Operation
        1. 7.1.1.1 Converter 1
        2. 7.1.1.2 Converter 2
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Dynamic Voltage Positioning
      2. 7.3.2 Undervoltage Lockout
      3. 7.3.3 Mode Selection
      4. 7.3.4 Enable
      5. 7.3.5 DEF_1 Pin Function
      6. 7.3.6 180° Out of Phase Operation
      7. 7.3.7 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Soft Start
      2. 7.4.2 100% Duty Cycle Low Dropout Operation
      3. 7.4.3 Power-Save Mode
      4. 7.4.4 Short Circuit Protection
    5. 7.5 Programming
      1. 7.5.1 EasyScale™ Interface: One-Pin Serial Interface for Dynamic Output Voltage Adjustment
        1. 7.5.1.1 General
        2. 7.5.1.2 Protocol
        3. 7.5.1.3 Bit Decoding
        4. 7.5.1.4 Acknowledge
        5. 7.5.1.5 MODE Selection
    6. 7.6 Register Maps
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Output Voltage Setting
        1. 8.1.1.1 Converter 1 Adjustable Default Output Voltage Setting
        2. 8.1.1.2 Converter 2
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Output Filter Design (Inductor and Output Capacitor)
          1. 8.2.2.1.1 Inductor Selection
          2. 8.2.2.1.2 Output Capacitor Selection
          3. 8.2.2.1.3 Input Capacitor Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
  13. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • DRC|10
    • MPDS117L
Thermal pad, mechanical data (Package|Pins)
  • DRC|10
    • QFND013N
Orderable Information
  • slvs737a_oa
  • slvs737a_pm
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DATA SHEET

TPS62410 2.25-MHz 2 x 800-mA Dual Step-Down Converter in Small 3 × 3 mm VSON Package

1 Features

  • High Efficiency up to 95%
  • VIN Range from 2.5 V to 6 V
  • 2.25-MHz Fixed Frequency Operation
  • Output Current 2 x 800 mA
  • Adjustable Output Voltage from 0.6 V to VIN
  • Optional EasyScale™ One-Pin Serial Interface for Dynamic Output Voltage Adjustment
  • Power-Save Mode at Light Load Currents
  • 180° Out of Phase Operation
  • Output Voltage Accuracy in PWM Mode ±1%
  • Typical 32-μA Quiescent Current for Both Converters
  • 100% Duty Cycle for Lowest Dropout
  • Available in a 10-Pin VSON (3 mm × 3 mm)

2 Applications

  • Cell Phones, Smartphones
  • PDAs, Pocket PCs
  • OMAP™ and Low-Power DSP Supply
  • Portable Media Players
  • Digital Radios
  • Digital Cameras

3 Description

The TPS62410 device is a synchronous dual step-down DC–DC converter. It provides two independent output voltage rails powered by 1-cell Li-Ion or 3-cell NiMH/NiCD batteries. The device is also suitable to operate from a standard 3.3 V or 5 V voltage rail.

With an input voltage range of 2.5 V to 6 V, the TPS62410 is ideal for battery powered portable applications like smart phones, PDAs, and other portable equipment.

With the EasyScale™ serial interface, the output voltages can be modified during operation. It therefore supports dynamic voltage scaling for low-power DSP and processors.

The TPS62410 operates at 2.25-MHz fixed switching frequency and enter the power-save mode operation at light load currents to maintain high efficiency over the entire load current range. For low-noise applications the devices can be forced into fixed frequency PWM mode by pulling the MODE/DATA pin High. In the shutdown mode, the current consumption is reduced to 1.2 μA. The device allows the use of small inductors and capacitors to achieve a small solution size.

The TPS62410 operates over a free-air temperature range of –40°C to 85°C. It is available in a 10-pin leadless package (3 × 3 mm VSON)

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS62410 VSON (10) 3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

TPS62410 sch_lvs737.gif

Efficiency vs Output Current

TPS62410 eff_vo_33_lvs737.gif

4 Revision History

Changes from * Revision (February 2007) to A Revision

  • Added 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
  • Deleted Ordering Information table Go

5 Pin Configuration and Functions

DRC Package
10-Pin VSON
Top View
TPS62410 po_lvs676.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
ADJ2 1 I Input to adjust output voltage of converter 2. In adjustable version (TPS62410) connect an external resistor divider between VOUT2, this pin and GND to set output voltage between 0.6 V and VIN. If EasyScale™ interface is used for converter 2, this pin must be directly connected to the output.
MODE/DATA 2 I This Pin has 2 functions:
  1. Operation mode selection: With low level, power-save mode is enabled where the device operates in PFM mode at light loads and enters automatically PWM mode at heavy loads. Pulling this PIN to High forces the device to operate in PWM mode over the whole load range.
  2. EasyScale™ interface function: One wire serial interface to change the output voltage of both converters. The pin has an open-drain output to provide an acknowledge condition if requested. The current into the open-drain output stage may not exceed 500 μA. The interface is active if either EN1 or EN2 is High.
VIN 3 I Supply voltage, connect to VBAT, 2.5 V to 6 V
FB1 4 I Direct feedback voltage sense input of converter 1, connect directly to VOUT1. An internal feed forward capacitor is connected between this pin and the error amplifier. In case of fixed output voltage versions or when the Interface is used, this pin is connected to an internal resistor divider network.
DEF_1 5 I/O This pin defines the output voltage of converter 1. The pin acts in TPS62410 as an analog input for output voltage setting through external resistors. In fixed default output voltage versions this pin is a digital input to select between two fixed default output voltages.
In TPS62410 an external resistor network needs to be connected to this pin to adjust the default output voltage.
SW1 6 — Switch pin of converter1. Connected to inductor 1
EN1 7 I Enable input for converter1, active high
GND 8 I GND for both converters, this pin should be connected with the PowerPAD
EN2 9 I/O Enable input for converter 2, active high
SW2 10 — Switch pin of converter 2. Connected to inductor 2
PowerPAD™ — — Connect to GND

6 Specifications

6.1 Absolute Maximum Ratings

Over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
Input voltage on VIN(2) –0.3 7 V
Voltage on EN, MODE/DATA, DEF_1 –0.3 VIN +0.3, ≤7 V
Maximum current into MODE/DATA 500 μA
Voltage on SW1, SW2 –0.3 7 V
Voltage on ADJ2, FB1 –0.3 VIN +0.3, ≤7 V
TJ(max) Maximum junction temperature 150 °C
TA Operating ambient temperature –40 85 °C
Tstg Storage temperature –65 150 °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.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1000
(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.

6.3 Recommended Operating Conditions

Over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
VIN Supply voltage 2.5 6 V
Output voltage range for adjustable voltage 0.6 VIN V
TA Operating ambient temperature -40 85 °C
TJ Operating junction temperature -40 125 °C

6.4 Thermal Information

THERMAL METRIC(1) TPS62410 UNIT
DRC (VSON)
10 PINS
RθJA Junction-to-ambient thermal resistance 45.9 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 64.3 °C/W
RθJB Junction-to-board thermal resistance 20.4 °C/W
ψJT Junction-to-top characterization parameter 1.3 °C/W
ψJB Junction-to-board characterization parameter 20.6 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 2.8 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

VIN = 3.6 V, VOUT = 1.8 V, EN = VIN, MODE = GND, L = 2.2 μH, COUT = 20 μF, TA = –40°C to 85°C typical values are at TA = 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
VIN Input voltage 2.5 6 V
IQ Operating quiescent current One converter, IOUT = 0 mA. PFM mode enabled (Mode = 0) device not switching,
EN1 = 1 or EN2 = 1		 19 29 μA
Two converter, IOUT = 0mA. PFM mode enabled (Mode = 0) device not switching,
EN1 = 1 and EN2 = 1		 32 48 μA
IOUT = 0 mA, MODE/DATA = GND, for one converter, VOUT 1.575 V(1) 23 μA
IOUT = 0 mA, MODE/DATA = VIN, for one converter, VOUT 1.575 V (1) 3.6 mA
ISD Shutdown current EN1, EN2 = GND, VIN = 3.6 V(2) 1.2 3 μA
EN1, EN2 = GND, VIN ramped from 0 V to 3.6 V(3) 0.1 1
VUVLO Undervoltage lockout threshold Falling 1.5 2.35 V
Rising 2.4
ENABLE EN1, EN2
VIH High-level input voltage, EN1, EN2 1.2 VIN V
VIL Low-level input voltage, EN1, EN2 0 0.4 V
IIN Input bias current, EN1, EN2 EN1, EN2 = GND or VIN 0.05 1 μA
DEF_1 INPUT
IIN Input biasd current DEF_1 DEF_1 = GND or VIN 0.01 1 μA
MODE/DATA
VIH High-level input voltage, MODE/DATA 1.2 VIN V
VIL Low-level input voltage, MODE/DATA 0 0.4 V
IIN Input bias current, MODE/DATA MODE/DATA = GND or VIN 0.01 1 μA
VOH Acknowledge output voltage high Open-drain, through external pullup resistor VIN V
VOL Acknowledge output voltage low Open-drain, sink current 500 μA 0 0.4 V
INTERFACE TIMING
tStart Start time 2 μs
tH_LB High time low bit, logic 0 detection Signal level on MODE/DATA pin is > 1.2 V 2 200 μs
tL_LB Low time low bit, logic 0 detection Signal level on MODE/DATA pin < 0.4 V 2 x tH_LB 400 μs
tL_HB Low time high bit, logic 1 detection Signal level on MODE/DATA pin < 0.4 V 2 200 μs
tH_LB High time high bit, logic 1 detection Signal level on MODE/DATA pin is > 1.2 V 2 x tL_HS 400 μs
TEOS End of Stream TEOS 2 μs
tACKN Duration of acknowledge condition (MODE/DATE line pulled low by the device) VIN 2.5 V to 6 V 400 520 μs
tvalACK Acknowledge valid time 2 μs
ttimeout Time-out for entering power-save mode MODE/DATA Pin changes from high to low 520 μs
POWER SWITCH
RDS(ON) P-channel MOSFET on-resistance, converter 1, 2 VIN = VGS = 3.6 V 280 620 mΩ
ILK_PMOS P-channel leakage current VDS = 6.0 V 1 μA
RDS(ON) N-channel MOSFET on-resistance converter 1, 2 VIN = VGS = 3.6 V 200 450 mΩ
ILK_SW1/SW2 Leakage current into SW1/SW2 pin Includes N-Chanel leakage current,
VIN = open, VSW = 6.0 V, EN = GND(4)		 6 7.5 μA
ILIMF Forward current limit PMOS and NMOS OUT 1/2 800 mA 2.5 V ≤ VIN ≤ 6.0 V 1 1.2 1.38 A
TSD Thermal shutdown Increasing junction temperature 150 °C
Thermal shutdown hysteresis Decreasing junction temperature 20 °C
OSCILLATOR
fSW Oscillator frequency 2.5 V ≤ VIN ≤ 6.0 V 2 2.25 2.5 MHz
OUTPUT
VOUT Adjustable output voltage range 0.6 VIN V
Vref Reference voltage 600 mV
VOUT (PFM) DC output voltage accuracy PFM mode, adjustable and fixed output voltage(6) Voltage positioning active, MODE/DATA = GND, device operating in PFM mode, VIN = 2.5 V to 5.0 V (5)(7) –1.5% 1.01 x VOUT 2.5%
VOUT MODE/DATA = GND; device operating in PWM mode VIN = 2.5 V to 6.0 V(7) –1% 0% 1%
VIN = 2.5 V to 6.0 V, MODE/DATA = VIN , Fixed PWM operation, 0 mA < IOUT < IOUTMAX(8) –1% 0% 1%
DC output voltage load regulation PWM operation mode 0.5 %/A
tStart up Start-up time Activation time to start switching(9) 170 μs
tRamp VOUT Ramp-up time Time to ramp from 5% to 95% of VOUT 750 μs
(1) Device is switching with no load on the output, L = 3.3 μH, value includes losses of the coil
(2) These values are valid after the device has been already enabled one time (EN1 or EN2 = High) and supply voltage VIN has not powered down.
(3) After the first enable, these values are valid when the device is disabled (EN1 and EN2 = Low) and supply voltage VIN is powered up. The values remain valid until the device has been enabled first time (EN1 or EN2 = High).
(4) At pins SW1 and SW2 an internal resistor of 1 MΩ is connected to GND
(5) Configuration L typical 2.2 μH, COUT typical 20 μF, see parameter measurement information, the output voltage ripple depends on the effective capacitance of the output capacitor, larger output capacitors lead to tighter output voltage tolerance
(6) Output voltage specification does not include tolerance of external voltage programming resistors
(7) In power-save mode, PWM operation is typically entered at IPSM = VIN/32 Ω.
(8) For VOUT >2. 2V, VIN min = VOUT +0.3 V
(9) This time is valid if one converter turns from shutdown mode (EN2 = 0) to active mode (EN2 =1) and the other converter is already enabled (that is, EN1 = 1). In case both converters are turned from shutdown mode (EN1 and EN2 = Low) to active mode (EN1 and/or EN2 = 1) a value of typical 80 μs for ramp up of internal circuits needs to be added. After tStart the converter starts switching and ramps VOUT.

6.6 Dissipation Ratings

PACKAGE POWER RATING FOR TA ≤25°C DERATING FACTOR ABOVE TA = 25°C
DRC 2050 mW 21 mW/°C

6.7 Typical Characteristics

TPS62410 fosc_vi_las676.gif
i.
Figure 1. FOSC vs VIN
TPS62410 idd2_vi_las676.gif
Figure 3. Iq for Both Converters, Not Switching
TPS62410 rdson2_vi_las276.gif
Figure 5. RDSON NMOS vs VIN
TPS62410 idd_vi_las676.gif
Figure 2. Iq for One Converter, Not Switching
TPS62410 rdson_vi_las676.gif
Figure 4. RDSON PMOS vs VIN

 
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