Datasheet

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GND

lim_L

TPS62750

2.2 µH

5.0V

H/L

lim_U

PGND

BULK

OUT

3.6V

TPS62750, TPS62751

www.ti.com

................................................................................................................................................. SLVS955A –JULY 2009–REVISED SEPTEMBER 2009

High Efficiency Step-Down Converter for USB Applications

Check for Samples :TPS62750, TPS62751

FEATURES

APPLICATIONS

• USB Wireless Modems

• Efficiency > 90% at Nominal Operating

Conditions

• Portable USB peripherals

• Handheld Computers

• Programmable Average Input Current Limits

for USB Applications

DESCRIPTION

– 50mA to 300mA for Low Current Limit

Range

The TPS6275x device is a highly efficient

synchronous step down dc-dc converter optimized for

– 300mA to 1.3A for High Current Limit

USB powered portable applications. It can provide up

Range

to 1300mA average input current and is ideal for

– ±10% Current Accuracy

applications connected to a USB host.

• Stable Output Voltage for Load Transients to

With an input voltage range of 2.9 V to 6.0V, the

Minimize Overshoot at Load Step Response

device supports batteries with extended voltage

• Hot Plug and Reverse Current Protection

range and is ideal for powering USB applications

• Automatic PFM/PWM Mode transition where USB compliance is required.

(TPS62750)

The TPS62750 operates at 2.25-MHz fixed switching

• Forced PWM for Noise Sensitive Applications

frequency and enters Power Save Mode operation at

(TPS62751)

light load currents to maintain high efficiency over the

entire load current range. The TPS62751 operates in

• V

Range From 2.9V to 6V

Forced PWM mode allowing use in applications that

• Adjustable V

OUT

From 0.8V to 0.85×VIN

are noise sensitive. An output discharge allows the

• Softstart for Inrush Current Prevention

load to discharge in shutdown.

• 2.25 MHz Fixed Frequency Operation

The 10% accurate average input current limit can be

• Short Cicruit and Thermal Shutdown

programmed with an external resistor, allowing use in

applications such as USB, where the current drawn

Protection

from the bus must be limited to 500mA.

• Available in a 2.5 × 2.5 10 pin SON Package

The TPS6275x allows the use of small inductors and

capacitors to achieve a small solution size. The

TPS6275x is available in a 2,5mm × 2,5mm 10-pin

SON package.

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.

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 (30 pages)

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TPS62750, TPS62751 www.ti.com .................................................................................................................................................
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TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. 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.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ELECTRICAL CHARACTERISTICS Over full operating ambient temperature range, typical values are at TA = 25°C. Unless otherwise noted, specifications apply for condition VIN = EN = 5.0V. External components CIN = 10μF 0603, CO = 10μF 0603, CBULK = 1.5mF, L = 2.
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TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com DEVICE INFORMATION PIN ASSIGNMENTS DSK PACKAGE (TOP VIEW) 10 AD 1 9 4 Po 3 we r P 2 5 8 7 6 PIN FUNCTIONS PIN I/O DESCRIPTION NAME NO. PGND 1 L 2 OUT H/L 3 IN H/L pin = high enables the upper current limit threshold set by RSET_H.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 FUNCTIONAL BLOCK DIAGRAM ILIM_L SOFTSTART ILIM_U AVIN Current Limit Comparator Undervoltage Lockout 1.8V Thermal Shutdown PVIN Limit High Side EN PFM Comparator FB VREF H/L Control Logic L Gate Driver Anti Shoot-Through Control Stage Error Amp.
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TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com PARAMETER MEASUREMENT INFORMATION TPS62750 VIN 5.0V VIN 2.2 µH L AV IN EN Ilim_U CIN Ilim_L R3 L1 FB H/L GND PGND VOUT 3.6V R1 R2 Cff CO CBULK R4 Table 2.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 TYPICAL CHARACTERISTICS TABLE OF GRAPHS Figure Maximum Output Current vs Input voltage Figure 1 Efficiency vs Output Current, Vin = [4.0V; 4.5V; 5.0V; 5.5V], Vout = 3.6V, H/L = High Figure 2 vs Output Current, Vin = [4.0V; 4.5V; 5.0V; 5.5V], Vout = 3.
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TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com 100 1000 VO = 3.6 V, H/L = High 950 900 VI = 5 V 850 Imax = 25°C 800 750 700 650 600 550 500 50 40 30 400 350 20 3.3 3.7 4.1 4.5 4.9 5.3 VI - Output Voltage - V 0 0.2 5.7 0.4 0.6 0.8 1 1.2 IO - Output Current - A 1.4 1.6 Figure 2.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 100 VI = 3.5 V VI = 4 V 80 80 VI = 4.5 V 70 Efficiency - % 90 VI = 5 V 60 VI = 5.5 V 50 40 400 mA 50 40 30 20 20 10 10 0.001 0.01 0.1 IO - Output Current - A VO = 3.6 V, H/L Pin = High 0 2.9 1 500 mA 60 30 0 0.
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TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com 3.7 3.744 3.708 VO = 3.6 V, Iload = 300 mA, H/L Pin = High Limit +3% 3.672 VO - Output Voltage - V VO - Output Voltage DC - V VO = 3.6 V, H/L Pin = Low 3.6 3.636 VI = 5 V 25°C 85°C 3.564 VI = 5.5 V 3.5 3.6 VI = 4.5 V - 40°C 3.528 Limit -3% 3.492 3.4 0.0001 3.456 3.6 3.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 3.744 VIN = 5 V, VOUT = 3.6 V, IOUT = 50 mA Limit +3% 3.708 VO - Output Voltage - V 3.672 VO = 3.6 V, Iload = 80 mA, H/L Pin = Low 3.636 3.6 VOUT = 10 mV/div - 40°C 3.564 25°C 85°C 3.528 Limit -3% 3.492 ICOIL = 100 mA/div 3.456 3.6 3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 5.
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TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com VOUT = 200 mV/div IIN = 500 mA/div IIN = 200 mV/div VOUT = 10 mV/div ICOIL = 200 mA/div VIN = 5 V, VOUT = 3.6 V, IOUT = 50 mA - 2 A VIN = 4.5 V - 5 V, VOUT = 3.6 V, IOUT = 80 mA t - Time - 1 ms/div t - Time - 1 ms/div Figure 17. Load Transient VIN =200 mV/div Figure 18.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 1.4 Average Input Current Limit - A Average Input Current Limit - A 0.3 0.25 0.2 0.15 0.1 0.05 0 0 60 80 40 100 120 140 RLIM_L - Lower Limit Resistance - kW 20 Figure 21. Average Input Current Limit 1.2 1 0.8 0.6 0.4 0.
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TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com EN = 5 V/div VIN = 5 V, VOUT = 3.6 V, IOUT = no load VOUT = 1 mV/div ICOIL = 200 mA/div t - Time - 200 ms/div Figure 25.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 DETAILED DESCRIPTION OPERATION The TPS6275x step down converter operates with typically 2.25MHz fixed frequency pulse width modulation (PWM) at moderate to heavy load currents.
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TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com OUTPUT CAPACITOR DISCHARGE With EN = GND, the device enters shutdown mode and all internal circuits are disabled. The SW pin is connected to PGND via an internal resistor (typically 235Ω) to discharge the output capacitor.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 APPLICATION INFORMATION Wireless Module PA TPS62750 USB 5.0V ILIM_U ILIM_L C IN 10µF R LIM_U 3.7V R1 AV IN EN 2.2µH Wireless BB + PMIC VOUT VIN FB H/L GND PGND R2 Cff CO CBUFF RLIM_L PMU, DCDC, LDO Figure 26.
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TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com INDUCTOR SELECTION The inductor value has a direct effect on the ripple current. The selected inductor has to be rated for its dc resistance and saturation current. The inductor ripple current (ΔIL) decreases with higher inductance and increases with higher VIN or VOUT.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 OUTPUT CAPACITOR SELECTION The TPS62750 has been specifically internally compensated to operate with large capacitance values.
PAGE 20
TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com æ 1.23 Upper range: RLIM_U = ç ç ILIM_U è ö ÷ ´ 20000 ÷ ø (7) æ 1.23 = ç ç ILIM_L è ö ÷ ´ 5400 ÷ ø (8) Lower range: RLIM_L Examples of different input current limit values selectable are given in the table below: AVERAGE INPUT CURRENT REQUIRED RESISTOR VALUE 50 mA 132.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 LAYOUT CONSIDERATIONS As for all switching power supplies, the layout is an important step in the design. Proper function of the device demands careful attention to PCB layout. Care must be taken in board layout to get the specified performance.
PAGE 22
TPS62750, TPS62751 SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................................. www.ti.com THERMAL INFORMATION Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires special attention to power dissipation.
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TPS62750, TPS62751 www.ti.com ................................................................................................................................................. SLVS955A – JULY 2009 – REVISED SEPTEMBER 2009 Changes from Original (July 2009) to Revision A ........................................................................................................... Page • Added TPS62751 device .......................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Dec-2010 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing TPS62750DSKR SON DSK 10 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3000 179.0 8.4 2.73 2.73 0.8 4.0 8.0 Q2 TPS62750DSKT SON DSK 10 250 179.0 8.4 2.73 2.73 0.8 4.0 8.0 Q2 TPS62751DSKR SON DSK 10 3000 179.0 8.4 2.73 2.73 0.8 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Dec-2010 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS62750DSKR SON DSK 10 3000 203.0 203.0 35.0 TPS62750DSKT SON DSK 10 250 203.0 203.0 35.0 TPS62751DSKR SON DSK 10 3000 203.0 203.0 35.0 TPS62751DSKT SON DSK 10 250 203.0 203.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.