Datasheet

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TPS62040

TPS62042, TPS62043

TPS62044, TPS62046

SLVS463B − JUNE 2003 − REVISED OCTOBER 2005

1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER

FEATURES

D Up to 95% Conversion Efficiency

D Typical Quiescent Current: 18 µA

D Load Current: 1.2 A

D Operating Input Voltage Range: 2.5 V to 6.0 V

D Switching Frequency: 1.25 MHz

D Adjustable and Fixed Output Voltage

D Power Save Mode Operation at Light load

Currents

D 100% Duty Cycle for Lowest Dropout

D Internal Softstart

D Dynamic Output Voltage Positioning

D Thermal Shutdown

D Short-Circuit Protection

D 10 Pin MSOP PowerPad™ Package

D 10 Pin QFN 3 X 3 mm Package

APPLICATIONS

D PDA, Pocket PC and Smart Phones

D USB Powered Modems

D CPUs and DSPs

D PC Cards and Notebooks

D xDSL Applications

D Standard 5-V to 3.3-V Conversion

DESCRIPTION

The TPS6204x family of devices are high efficiency

synchronous step-down dc-dc converters optimized for

battery powered portable applications. The devices are

ideal for portable applications powered by a single Li-Ion

battery cell or by 3-cell NiMH/NiCd batteries. With an

output voltage range from 6.0 V down to 0.7 V, the devices

support low voltage DSPs and processors in PDAs,

pocket PCs, as well as notebooks and subnotebook

computers. The TPS6204x operates at a fixed switching

frequency of 1.25 MHz and enters 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 pin high. The

TPS6204x supports up to 1.2-A load current.

VIN

MODE

PGND

GND

TPS6204x

2.5 V to 6 V

0.7 V to V

/1.2 A

22 µF

6.2 µH

Typical Application Circuit 1.2-A Output Current

100

0 0.01 0.1 1 10 100 1 k 10 k

= 2.7 V

= 3.6 V

= 5 V

MODE = Low

= 3.6 V

MODE = High

Efficiency − %

EFFICIENCY

LOAD CURRENT

− Load Current − mA

= 1.8 V

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

www.ti.com

PowerPAD is a trademark of Texas Instruments.

Summary of content (30 pages)

PAGE 1
TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER FEATURES D Up to 95% Conversion Efficiency D Typical Quiescent Current: 18 µA D Load Current: 1.2 A D Operating Input Voltage Range: 2.5 V to 6.0 V D Switching Frequency: 1.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION TA PACKAGE VOLTAGE OPTIONS PACKAGE MARKING MSOP(1) QFN(2) MSOP QFN Adjustable TPS62040DGQ TPS62040DRC BBI BBO 1.5 V TPS62042DGQ TPS62042DRC BBL BBS 1.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 ELECTRICAL CHARACTERISTICS VI = 3.6 V, VO = 1.8 V, IO = 600 mA, EN = VIN, TA = −40°C to 85°C, typical values are at TA = 25°C (unless otherwise noted)(1) SUPPLY CURRENT PARAMETER TEST CONDITIONS VI Input voltage range I(Q) Operating quiescent current IO = 0 mA, device is not switching ISD Shutdown supply current EN = GND VUVLO Under−voltage lockout threshold MIN TYP 2.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 PIN ASSIGNMENTS DGQ PACKAGE (TOP VIEW) EN VIN VIN GND FB NOTE: 1 10 2 9 3 8 4 7 5 6 DRC PACKAGE (TOP VIEW) PGND PGND SW SW MODE EN VIN VIN GND FB 1 10 2 9 3 8 4 7 5 6 PGND PGND SW SW MODE The PowerPAD must be connected to GND. Terminal Functions TERMINAL NAME NO. I/O DESCRIPTION EN 1 I Enable. Pulling EN to ground forces the device into shutdown mode.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 FUNCTIONAL BLOCK DIAGRAM VIN Current limit Comparator Undervoltage Lockout Bias supply + − Soft Start EN + Ref SkipComparator − V Vcomp Comparator + Saw Tooth Generator Ref MODE 1.25 MHz Oscillator I P−Channel Power MOSFET VIN S R − Control Logic SW Driver Shoot−thru Logic SW Comp High Comp Low Comp High Comp Low LoadComparator − Gm + R1 Compensation Comp Low 2 Vref = 0.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 EFFICIENCY vs LOAD CURRENT 100 100 VO = 1.5 V 95 90 IL = 500 mA Efficiency − % VI = 3.6 V 80 VI = 5 V 75 VO = 1.8 V MODE = Low 95 VI = 2.7 V 85 Efficiency − % EFFICIENCY vs INPUT VOLTAGE 70 65 60 90 85 IL = 1000 mA IL = 1 mA 80 55 50 75 45 40 0 0.01 0.1 1 10 100 IL − Load Current − mA 1k 70 2.5 10 k 3 3.5 4 4.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 SWITCHING FREQUENCY vs INPUT VOLTAGE P-CHANNEL rDS(on) vs INPUT VOLTAGE 0.180 1.23 TA = 85°C 1.22 0.170 TA = 25°C 1.22 P−Channel r DS(on) − Ω f − Switching Frequency − MHz 1.23 1.21 1.21 TA = −40°C 1.20 1.20 TA = 85°C 0.150 TA = 25°C 0.140 0.130 0.120 0.110 1.19 0.100 1.19 TA = −40°C 0.090 1.18 1.18 2.5 0.160 2.9 3.3 3.7 4.1 4.5 4.9 VI − Input Voltage − V 5.3 5.7 6 0.080 2.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 PWM OPERATION IL 500 mA/div IO 150mA to 1.15 A VO 20 mV/div VO 100 mV/div VI = 3.6 V VO = 1.8 V PWM/PFM Operation V SW 5 V/div LOAD TRANSIENT RESPONSE 500 ns/div 50 µs/div Figure 10 Figure 11 POWER SAVE MODE V SW 5 V/div Enable 2 V/div VO 1 V/div 200 mA/div IL 500 mA/div VO 20 mV/div START-UP I IN VI = 3.6 V VO = 1.8 V IO = 1.1 A 2.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 DETAILED DESCRIPTION OPERATION The TPS6204x is a synchronous step-down converter operating with typically 1.25 MHz fixed frequency. At moderate to heavy load currents, the device operates in pulse width modulation (PWM), and at light load currents, the device enters power save mode operation using pulse frequency modulation (PFM). When operating in PWM mode, the typical switching frequency is 1.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 PFM Mode at Light Load 1.6% Comp High 0.8% Comp Low Comp Low 2 VO PWM Mode at Medium to Full Load Figure 14. Power Save Mode Thresholds and Dynamic Voltage Positioning The converter enters the fixed frequency PWM mode as soon as the output voltage falls below the comp low 2 threshold.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 SOFTSTART The TPS6204x series has an internal softstart circuit that limits the inrush current during start up. This prevents possible voltage drops of the input voltage in case a battery or a high impedance power source is connected to the input of the TPS6204x.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 APPLICATION INFORMATION ADJUSTABLE OUTPUT VOLTAGE VERSION When the adjustable output voltage version TPS62040 is used, the output voltage is set by the external resistor divider. See Figure 15. The output voltage is calculated as: V O ǒ1 ) R1 Ǔ R2 + 0.5 V (3) with R1 + R2 ≤ 1 MΩ and internal reference voltage Vref typical = 0.5 V R1 + R2 should not be greater than 1 MΩ because of stability reasons.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 Inductor Selection The TPS6204x typically uses a 6.2-µH output inductor. Larger or smaller inductor values can be used to optimize the performance of the device for specific operation conditions. The selected inductor has to be rated for its dc resistance and saturation current. The dc resistance of the inductance directly influences the efficiency of the converter.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 Output Capacitor Selection The advanced fast response voltage mode control scheme of the TPS6204x allows the use of small ceramic capacitors with a typical value of 22 µF without having large output voltage under and overshoots during heavy load transients. Ceramic capacitors having low ESR values have the lowest output voltage ripple and are recommended.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 Layout Considerations For all switching power supplies, the layout is an important step in the design especially at high peak currents and switching frequencies. If the layout is not carefully done, the regulator might show stability problems as well as EMI problems. Therefore, use wide and short traces for the main current paths as indicated in bold in Figure 16. These traces should be routed first.
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TPS62040 TPS62042, TPS62043 TPS62044, TPS62046 www.ti.com SLVS463B − JUNE 2003 − REVISED OCTOBER 2005 TYPICAL APPLICATIONS VI Li-lon TPS62046 2 VIN 3 VIN 1 EN 6 MODE 4 GND C1 22 µF SW 8 L1 6.2 µH 7 SW 5 FB 10 PGND 9 PGND VO 3.3 V / 1.2 A C2 22 µF Components: C1: Taiyo Yuden JMK316BJ226ML C2: Taiyo Yuden JMK316BJ226ML L1: Sumida CDRH5D28−6R2 Figure 17. Li-Ion to 3.3 V/1.2 A Conversion VI 2.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 29-Jun-2011 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
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PACKAGE MATERIALS INFORMATION www.ti.com 20-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS62040DGQR MSOPPower PAD DGQ 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TPS62040DRCR SON DRC 10 3000 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q2 TPS62040DRCR SON DRC 10 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 20-Jul-2012 Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS62046DGQR MSOPPower PAD DGQ 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TPS62046DRCR SON DRC 10 3000 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q2 TPS62046DRCR SON DRC 10 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 20-Jul-2012 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS62046DGQR MSOP-PowerPAD DGQ 10 2500 364.0 364.0 27.0 TPS62046DRCR SON DRC 10 3000 370.0 355.0 55.0 TPS62046DRCR SON DRC 10 3000 367.0 367.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.