Datasheet

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VIN

LBO

GND

SYNC

LBI

PGND

TPS62052

= 10 µF

= 22 µF

= 1.5 V / 800 mA

L1 = 10 µHV

= 3.3 V to 10 V

TYPICAL APPLICATION CIRCUIT

– Output Current – mA

0.01 0.1 1 10

Efficiency – %

TPS62050

EFFICIENCY

OUTPUT CURRENT

100

100 1 k

= 7.2 V,

= 5 V,

SYNC = L

TPS62052, TPS62054

TPS62056, TPS62050, TPS62051

www.ti.com

SLVS432E –SEPTEMBER 2002–REVISED JUNE 2011

800-mA SYNCHRONOUS STEP-DOWN CONVERTER

Check for Samples: TPS62052, TPS62054, TPS62056, TPS62050, TPS62051

FEATURES

DESCRIPTION

The TPS6205x devices are a family of high-efficiency

• High-Efficiency Synchronous Step-Down

synchronous step-down dc/dc converters ideally

Converter With up to 95% Efficiency

suited for systems powered from a 1-cell or 2-cell Li-

• 12-µA Quiescent Current (Typ)

Ion battery or from a 3-cell to 5-cell NiCd, NiMH, or

• 2.7-V to 10-V Operating Input Voltage Range

alkaline battery.

• Adjustable Output Voltage Range From 0.7 V

The TPS62050 is a synchronous PWM converter with

to 6 V

integrated N-channel and P-channel power MOSFET

switches. Synchronous rectification increases

• Fixed Output Voltage Options Available in

efficiency and reduces external component count. To

1.5 V, 1.8 V, and 3.3 V

achieve highest efficiency over a wide load current

• Synchronizable to External Clock Signal up to

range, the converter enters a power-saving pulse-

1.2 MHz

frequency modulation (PFM) mode at light load

• High Efficiency Over a Wide Load Current

currents. Operating frequency is typically 850 kHz,

allowing the use of small inductor and capacitor

Range in Power-Save Mode

values. The device can be synchronized to an

• 100% Maximum Duty Cycle for Lowest

external clock signal in the range of 600 kHz to 1.2

Dropout

MHz. For low noise operation, the converter can be

• Low Noise Operation in Forced Fixed

programmed into forced-fixed frequency in PWM

Frequency PWM Operation Mode

mode. In shutdown mode, the current consumption is

reduced to less than 2 µA. The TPS6205x is

• Internal Softstart

available in the 10-pin (DGS) micro-small outline

• Overtemperature and Overcurrent Protected

package (MSOP) and operates over an free air

• Available in 10-Pin Microsmall Outline

temperature range of –40°C to 85°C.

Package MSOP

APPLICATIONS

• Cellular Phones

• Organizers, PDAs, and Handheld PCs

• Low Power DSP Supply

• Digital Cameras and Hard Disks

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.

2MATHCAD is a registered trademark of Mathsoft Incorporated.

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 (27 pages)

PAGE 1
TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 800-mA SYNCHRONOUS STEP-DOWN CONVERTER Check for Samples: TPS62052, TPS62054, TPS62056, TPS62050, TPS62051 FEATURES DESCRIPTION • The TPS6205x devices are a family of high-efficiency synchronous step-down dc/dc converters ideally suited for systems powered from a 1-cell or 2-cell LiIon battery or from a 3-cell to 5-cell NiCd, NiMH, or alkaline battery.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 ELECTRICAL CHARACTERISTICS VI = 7.2 V, VO = 3.3 V, IO = 300 mA, EN = VI, TA = –40°C to 85°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY CURRENT VI Input voltage range I(Q) Operating quiescent current I(SD) Shutdown current IQ(LBI) Quiescent current with enhanced LBI comparator version. 10 V IO = 0 mA, SYNC = GND, VI = 7.2 V 2.7 12 20 µA EN = GND 1.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VI = 7.2 V, VO = 3.3 V, IO = 300 mA, EN = VI, TA = –40°C to 85°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OUTPUT VO Adjustable output voltage range TPS62050, TPS62051 V(FB) Feedback voltage TPS62050, TPS62051 0.5 FB leakage current TPS62050, TPS62051 0.02 Feedback voltage tolerance TPS62050, TPS62051 VI = 2.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 PIN ASSIGNMENTS DGS PACKAGE (TOP VIEW) VIN LBO GND PG FB 1 10 2 9 3 8 4 7 5 6 PGND SW EN SYNC LBI Pin Functions PIN NAME NO. I/O DESCRIPTION EN 8 I Enable. A logic high enables the converter, logic low forces the device into shutdown mode, reducing the supply current to less than 2 µA. FB 5 I Feedback pin for the fixed output voltage option.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 www.ti.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 PARAMETER MEASUREMENT INFORMATION All graphs were generated using the circuit as shown unless otherwise noted. For output voltages other than 5 V, the fixed voltage versions are used. The resistors R1, R2, and the feedforward capacitor (Cff) are removed and the feedback pin is directly connected to the output.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 www.ti.com TYPICAL CHARACTERISTICS Table 1.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 TPS62054 EFFICIENCY vs LOAD CURRENT TPS62056 EFFICIENCY vs LOAD CURRENT 100 VI = 2.7 V 90 VI = 3.3 V 80 80 VI = 5 V 60 VI = 7.2 V 50 40 VI = 10 V VI = 7.2 V 60 50 40 VI = 10 V 30 30 SYNC = H VO = 1.8 V TA = 25°C 20 10 0.1 1 10 100 10 0 0.01 1k 0.1 1 10 100 3.6 V 880 870 5V 860 850 7.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 www.ti.com APPLICATION INFORMATION Operation The TPS6205x is a synchronous step-down converter that operates with a 850-kHz fixed frequency pulse width modulation (PWM) at moderate to heavy load currents and enters the power-save mode at light load current.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 1.6% 0.8% VO, nominal –1.6% t Figure 17. Power-Save Mode Output Voltage Thresholds The converter enters the fixed frequency PWM mode again as soon as the output voltage falls below the comp low 2 threshold set to 1.6% below VO, nominal. Soft-Start The TPS6205x has an internal soft-start circuit that limits the inrush current during start-up.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 www.ti.com VIN VIN 0 µA for VEN < 0.6 V Typically 0.3 µA to 5 µAfor VEN < 4 V 5V Vt = 0.7 V EN Enable to Internal Circuitry Figure 18. Internal Circuit of the ENABLE Pin The EN pin can be used in a pushbutton configuration as shown in Figure 19. The external resistor to GND must be capable of sinking 0.3 µA with a minimum voltage drop of 1.3 V to keep the system enabled when both switches are open.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 Connecting the SYNC pin to the GND pin enables the power-save mode. The converter operates in the PWM mode at moderate to heavy loads and in the PFM mode during light loads maintaining high efficiency over a wide load current range. Power Good Comparator The power good (PG) comparator has an open drain output capable of sinking typically 1 mA.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 www.ti.com 1 8 VIN SW EN FB L1 = 10 µH VO = 2.5 V / 600 mA 5 R3 R4 R1 C(ff) = 6.8 pF TPS62051 R5 6 Ci = 10 µF 1 Cell Li-lon 9 PG 4 LBI 7 SYNC R6 GND 3 LBO R2 2 Co = 22 µF PGND 10 R7 Figure 21. Enhanced LBI With Increased Hysteresis A MATHCAD® file to calculate R7 can be downloaded from the product folder on the TI web.
PAGE 15
TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 Table 2. Values NOMINAL OUTPUT VOLTAGE EQUATION POSSIBLE RESISTOR COMBINATION TYPICAL FEEDBACK CAPACITOR 0.7 V R1 = 0.4 x R2 R1 = 270 k, R2 = 680 k C(ff) = 22 pF 1.2 V R1 = 1.4 x R2 R1 = 510 k, R2 = 360 k (1.21 V) C(ff) = 6.8 pF 1.5 V R1 = 2 x R2 R1 = 300 k, R2 = 150 k (1.50 V) C(ff) = 6.8 pF 1.8 V R1 = 2.6 x R2 R1 = 390 k, R2 = 150 k (1.80 V) C(ff) = 6.8 pF 2.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 www.ti.com LAYOUT AND BOARD SPACE All capacitors should be soldered as close as possible to the IC. For information on the PCB layout see the user's guideSLVU081. Keep the feedback track as short as possible. Any coupling to the FB pin may cause additional output voltage ripple. INDUCTOR SELECTION A 10-µH minimum inductor should be used with the TPS6205x.
PAGE 17
TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 OUTPUT CAPACITOR SELECTION The output capacitor should have a minimum value of 22µF. For best performance, a low ESR ceramic output capacitor is needed.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 www.ti.com Table 5. Capacitor Manufacturers 18 MANUFACTURER CAPACITOR TYPE INTERNET Taiyo Yuden X7R/X5R ceramic www.t-yuden.com TDK X7R/X5R ceramic www.component.tdk.com Vishay X7R/X5R ceramic www.vishay.com Kemet X7R/X5R ceramic www.kemet.
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TPS62052, TPS62054 TPS62056, TPS62050, TPS62051 www.ti.com SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011 REVISION HISTORY Note: Page numbers of current version may differ from previous versions. Changes from Revision D (October 2003) to Revision E Page • Changed to Revision E, June 2011 ...................................................................................................................................... 1 • Changed formatting. ..........................................................
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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.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Jan-2014 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 TPS62050DGSR VSSOP DGS 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TPS62051DGSR VSSOP DGS 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TPS62052DGSR VSSOP DGS 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Jan-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS62050DGSR VSSOP DGS 10 2500 367.0 367.0 35.0 TPS62051DGSR VSSOP DGS 10 2500 367.0 367.0 35.0 TPS62052DGSR VSSOP DGS 10 2500 367.0 367.0 35.0 TPS62054DGSR VSSOP DGS 10 2500 358.0 335.0 35.0 TPS62054DGSR VSSOP DGS 10 2500 367.0 367.0 35.0 TPS62056DGSR VSSOP DGS 10 2500 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 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.