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FEATURES DESCRIPTION

APPLICATIONS

Typical Application Circuit (600-mA Output Current)

VIN

MODE

PGND

GND

4 9

TPS62020

10 µF

2.5 V to 6 V

10 µH

10 µF

0.7 V to V

/ 600 mA

100

0 0.01 0.10 1 100010 100

Efficiency − %

EFFICIENCY

LOAD CURRENT

− Load Current − mA

= 1.8 V

= 3.6 V

Mode = High

Mode = Low

= 5 V

= 3.6 V

= 2.7 V

TPS62020

TPS62021

TPS62026

SLVS076C – JUNE 2003 – REVISED DECEMBER 2004

600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER

• Up to 95% Conversion Efficiency

The TPS6202x is a high efficiency synchronous

step-down dc-dc converter optimized for battery pow-

• Typical Quiescent Current: 18 µA

ered portable applications. This device is ideal for

• Load Current: 600 mA

portable applications powered by a single Li-Ion

• Operating Input Voltage Range: 2.5 V to 6.0 V

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

• Switching Frequency: 1.25 MHz output voltage range from 6.0 V down to 0.7 V, the

device supports low voltage DSPs and processors in

• Adjustable and Fixed Output Voltage

PDAs, pocket PCs, as well as notebooks and

• Power Save Mode Operation at Light load

subnotebook computers. The TPS6202x operates at

Currents

a fixed switching frequency of 1.25 MHz and enters

the power save mode operation at light load currents

• Active-Low MODE pin on TPS62021

to maintain high efficiency over the entire load current

• 100% Duty Cycle for Lowest Dropout

range. For low noise applications, the device can be

• Internal Softstart

forced into fixed frequency PWM mode by pulling the

• Dynamic Output Voltage Positioning

MODE pin high. The difference between the

TPS6202x and the TPS62021 is the logic level of the

• Thermal Shutdown

MODE pin. The TPS62021 has an active-low MODE

• Short-Circuit Protection

pin. The TPS6202x supports up to 600-mA load

• 10 Pin MSOP PowerPad™ Package

current.

• 10 Pin QFN 3 X 3 mm Package

• PDA, Pocket PC and Smart Phones

• USB Powered Modems

• CPUs and DSPs

• PC Cards and Notebooks

• xDSL Applications

• Standard 5-V to 3.3-V Conversion

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.

PowerPad is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (28 pages)

PAGE 1
TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER FEATURES • • • • • • • • • • • • • • • DESCRIPTION Up to 95% Conversion Efficiency Typical Quiescent Current: 18 µA Load Current: 600 mA Operating Input Voltage Range: 2.5 V to 6.0 V Switching Frequency: 1.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 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 MARKING OUTPUT VOLTAGE MSOP (1) QFN (2) MSOP QFN MODE Adjustable TPS62020DGQ TPS62020DRC BBK BBJ MODE Adjustable TPS62021DGQ TPS62021DRC ASH ASJ MODE 3.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 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) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY CURRENT VI Input voltage range 2.5 I(Q) Operating quiescent current IO = 0 mA, device is not switching ISD Shutdown supply current EN = GND VUVLO Under-voltage lockout threshold 6.0 V 18 35 µA 0.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 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. Pulling EN to VI enables the device.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 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.
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TPS62020 TPS62021 TPS62026 www.ti.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 EFFICIENCY vs LOAD CURRENT 100 100 VO = 1.5 V 95 90 VO = 1.8 V Mode = Low 95 VI = 2.7 V 85 VI = 3.6 V 75 IL = 250 mA 90 Efficiency − % 80 Efficiency − % EFFICIENCY vs INPUT VOLTAGE VI = 5 V 70 65 Mode = Low 60 IL = 500 mA 85 IL = 1 mA 80 55 50 75 Mode = High 45 40 0 0.01 0.10 1 10 IL − Load Current − mA 100 70 2.5 1000 4 4.5 5 Figure 3. Figure 4.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 SWITCHING FREQUENCY vs INPUT VOLTAGE P-CHANNEL rDS(on) vs INPUT VOLTAGE 0.180 1.23 0.170 TA = 85°C 1.22 P−Channel r DS(on) − Ω f − Switching Frequency − MHz 1.23 TA = 25°C 1.22 1.21 1.21 TA = −40°C 1.20 1.20 TA = 85°C 0.150 0.140 TA = 25°C 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 0.080 2.5 6 2.9 3.3 3.7 4.1 4.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 PWM OPERATION POWER SAVE MODE OPERATION IL 500 mA/div VI = 3.6 V, VO = 1.8 V 2.5 µs/div 500 ns/div Figure 11. Figure 12. 2 V/div VI = 3.6 V, VO = 1.8 V, IO = 545 mA VO 1 V/div Enable START-UP II 200 mV/div IL 500 mA/div VO 20 mV/div VO 20 mV/div VSW 5 V/div VSW 2 V/div VI = 3.6 V, VO = 1.8 V 200 µs/div Figure 13.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 DETAILED DESCRIPTION OPERATION The TPS6202x is a synchronous step-down converter that typically operates at a 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-requency modulation (PFM). When operating in PWM mode, the typical switching frequency is 1.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 DETAILED DESCRIPTION (continued) PFM Mode at Light Load 1.6% Comp High 0.8% Comp Low VO Comp Low 2 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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TPS62020 TPS62021 TPS62026 SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 www.ti.com DETAILED DESCRIPTION (continued) • • RL = DC resistance of the inductor VOmax = nominal output voltage plus maximum output voltage tolerance SOFTSTART The TPS6202x 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 TPS6202x.
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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 APPLICATION INFORMATION ADJUSTABLE OUTPUT VOLTAGE VERSION When the adjustable output voltage version TPS6202x is used, the output voltage is set by the external resistor divider. See Figure 15. The output voltage is calculated as: V 0.5 V 1 R1 O R2 (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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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 APPLICATION INFORMATION (continued) inductor value, increase the output capacitor accordingly. See the application circuits in Figure 17, Figure 18, and Figure 19. 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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TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 V 1– O V I V V O O L ƒ 1 ESR 8 C ƒ O (9) Where the highest output voltage ripple occurs at the highest input voltage, VI. At light load currents, the device operates in power save mode and the output voltage ripple is independent of the output capacitor value. The output voltage ripple is set by the internal comparator thresholds. The typical output voltage ripple is 1% of the nominal output voltage.
PAGE 16
TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 THERMAL INFORMATION One of the most influential components on the thermal performance of a package is board design. In order to take full advantage of the heat dissipating abilities of the PowerPAD™ packages, a board should be used that acts similar to a heat sink and allows for the use of the exposed (and solderable), deep downset pad.
PAGE 17
TPS62020 TPS62021 TPS62026 www.ti.com SLVS076C – JUNE 2003 – REVISED DECEMBER 2004 Vin 3.6 V to 6 V C1 10 F TPS62026 2 3 1 6 4 VIN VIN EN MODE GND 8 L1 6.8 H SW 7 SW FB 5 PGND 10 9 PGND Vout 3.3 V/0.6 A C2 22 F Figure 20. TPS62026 Fixed 3.3 V Output Using 6.8 µH inductor Vin 3.6 V to 6 V C1 10 F TPS62026 2 VIN 3 VIN 1 EN 6 MODE 4 GND SW SW FB PGND PGND 8 7 5 10 9 L1 10 H Vout 3.3 V / 0.6 A C2 10 F Figure 21. TPS62026 Fixed 3.
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PACKAGE OPTION ADDENDUM www.ti.
PAGE 19
PACKAGE OPTION ADDENDUM www.ti.com 10-Jun-2014 PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details.
PAGE 20
PACKAGE MATERIALS INFORMATION www.ti.com 17-Aug-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 TPS62020DGQR MSOPPower PAD DGQ 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TPS62020DRCR SON DRC 10 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS62021DRCR SON DRC 10 3000 330.0 12.4 3.3 3.3 1.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 17-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS62020DGQR MSOP-PowerPAD DGQ 10 2500 364.0 364.0 27.0 TPS62020DRCR SON DRC 10 3000 367.0 367.0 35.0 TPS62021DRCR SON DRC 10 3000 370.0 355.0 55.0 TPS62021DRCR SON DRC 10 3000 367.0 367.0 35.0 TPS62026DGQR MSOP-PowerPAD DGQ 10 2500 364.0 364.0 27.0 TPS62026DRCR SON DRC 10 3000 367.0 367.
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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 JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.