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I With TPS62730

BAT

2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8

Battery Voltage - V

BAT

Battery Current

Reduction @

CC2540

0dBm CW TX

Power

Battery Current Reduction of CC2540

2.4GHz Bluetooth Low Energy

System-On-Chip Solution

Battery Current - mA

I NO TPS62730

BAT

TPS62730

VIN

ON/BYP

STAT

GND

VOUT

2.1V

OUT

2.2V - 3.9V*

2.2

µF

2.2

OUT

µF

L 2.2 Hm

BYP

* At V < 2.2V, V tracks V

IN OUT IN

pullup

TPS62732, TPS62733

TPS62730

www.ti.com

SLVSAC3C –MAY 2011–REVISED DECEMBER 2012

Step Down Converter with Bypass Mode for Ultra Low Power Wireless Applications

Check for Samples: TPS62732, TPS62733, TPS62730

FEATURES

DESCRIPTION

The TPS62730 is a high frequency synchronous step

• Input Voltage Range V

from 1.9V to 3.9V

down DC-DC converter optimized for ultra low power

• Typ. 30 nA Ultra Low Power Bypass Mode

wireless applications. The device is optimized to

• Typ. 25 μA DC/DC Quiescent Current

supply TI's Low Power Wireless sub 1GHz and

2.4GHz RF transceivers and System-On-Chip-

• Internal Feedback Divider Disconnect

solutions. The TPS62730 reduces the current

• Typ. 2.1Ω Bypass Switch between V

and V

OUT

consumption drawn from the battery during TX and

• Automatic Transition from DC/DC to Bypass

RX mode by a high efficient step down voltage

Mode

conversion. It provides up to 100mA output current

and allows the use of tiny and low cost chip inductors

• Up To 3MHz switch frequency

and capacitors. With an input voltage range of 1.9V to

• Up to 95% DC/DC Efficiency

3.9V the device supports Li-primary battery

• Open Drain Status Output STAT

chemistries such as Li-SOCl2, Li-SO2, Li-MnO2 and

also two cell alkaline batteries.

• Output Peak Current up to 100mA

• Fixed Output Voltages 1.9V, 2.05V, 2.1V, 2.3V

The TPS62730 features an Ultra Low Power bypass

mode with typical 30nA current consumption to

• Small External Output Filter Components

support sleep and low power modes of TI's CC2540

2.2μH/ 2.2μF

Bluetooth Low Energy and CC430 System-On-Chip

• Optimized For Low Output Ripple Voltage

solutions. In this bypass mode, the output capacitor

• Small 1 × 1.5 × 0.6mm

SON Package

of the DC/DC converter is connected via an

integrated typ. 2.1Ω Bypass switch to the battery.

• 12 mm

Minimum Solution Size

In DC/DC operation mode the device provides a fixed

APPLICATIONS

output voltage to the system. With a switch frequency

up to 3MHz, the TPS62730 features low output ripple

• CC2540 Bluetooth™ Low Energy

voltage and low noise even with a small 2.2uF output

System-On-Chip Solution

capacitor. The automatic transition into bypass mode

• Low Power Wireless Applications

during DC/DC operation prevents an increase of

output ripple voltage and noise once the DC/DC

• RF4CE, Metering

converter operates close to 100% duty cycle. The

device automatically enters bypass mode once the

battery voltage falls below the transition threshold

IT BYP

. The TPS62730 is available in a 1 × 1.5mm

6 pin QFN 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.

2Bluetooth is a trademark of Bluetooth SIG.

UNLESS OTHERWISE NOTED this document contains

PRODUCTION DATA information 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.

Summary of content (28 pages)

PAGE 1
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 Step Down Converter with Bypass Mode for Ultra Low Power Wireless Applications Check for Samples: TPS62732, TPS62733, TPS62730 FEATURES DESCRIPTION • • • • • • The TPS62730 is a high frequency synchronous step down DC-DC converter optimized for ultra low power wireless applications. The device is optimized to supply TI's Low Power Wireless sub 1GHz and 2.4GHz RF transceivers and System-On-Chipsolutions.
PAGE 2
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com 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.
PAGE 3
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 RECOMMENDED OPERATING CONDITIONS operating ambient temperature TA = –40 to 85°C (unless otherwise noted) MIN Supply voltage VIN 1.9 Effective inductance 1.5 NOM MAX UNIT 3.9 2.2 V 3 μH Effective output capacitance connected to VOUT 1.0 10 μF Operating junction temperature range, TJ –40 125 °C TA Operating free air temperature range -40 85 ELECTRICAL CHARACTERISTICS VIN = 3.0V, VOUT = 2.
PAGE 4
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VIN = 3.0V, VOUT = 2.1V, ON/BYP = VIN, TA = –40°C to 85°C typical values are at TA = 25°C (unless otherwise noted), CIN = 2.2μF, L = 2.2μH, COUT = 2.
PAGE 5
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 PIN FUNCTIONS (continued) PIN NAME NO STAT 1 I/O DESCRIPTION OUT This is the open drain status output with active low level. An internal comparator drives this output. The pin is high impedance with ON/BYP = low. With ON/BYP set to high the device and the internal VOUT comparator becomes active. The active low STAT pin indicates if the DC/DC regulator is settled and the output voltage above the VTSTAT threshold.
PAGE 6
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com PARAMETER MEASUREMENT INFORMATION VIN 1.9V - 3.9V TPS6273x VIN GND CIN 2.2µF L 2.2mH SW VOUT ON BYP ON/BYP Additional Decoupling capacitor bank VOUT 4x100nF 1x 1uF 1x 2.2uF RSTAT 10k COUT 2.2µF CDEC STAT , CIN COUT: Murata GRM155R60J225ME15D 2.2 mF 0402 size CLoad: 4 x Murata GRM155R61A104KA01D 100nF 1 x 2.2 mF GRM155R60J225ME15D 1 x 1mF GRM155R61A105KE15D L: Murata LQM21PN2R2NGC 2.
PAGE 7
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 TYPICAL CHARACTERISTICS (continued) 100 100 IOUT = 50 mA 95 VIN = 2.1 V Bypass 95 90 75 Efficiency - % Efficiency - % 85 VIN = 2.3 V VIN = 2.7 V VIN = 3 V VIN = 3.6 V 80 70 65 55 1 10 IO - Output Current - mA 80 70 IOUT = 100 mA TPS62730 VOUT = 2.1 V, ON/BYP = High, L = 2.2 mH, COUT = 2.2 mF 60 55 50 2.1 100 2.3 2.5 2.7 2.9 3.1 3.3 VIN - Input Voltage - V 3.5 3.7 3.9 Figure 2.
PAGE 8
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) 35 TA = 85°C IQ - Operating Quiescent Current - mA ISD - Shutdown Current Bypass Mode - nA 1k TA = 70°C TA = 60°C 100 TA = 50°C TA = 25°C TA = -40°C 10 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5 3.7 TA = 50°C 25 20 TA = 25°C 15 TA = 0°C 5 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 Figure 6. Operating Quiescent Current vs Input Voltage 1.
PAGE 9
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 TYPICAL CHARACTERISTICS (continued) 2.3 TA = 85°C 0.6 2.25 TA = 60°C TA = 50°C 0.5 TA = 25°C 0.4 0.3 ON/BYP = high automatic transition into bypass mode falling VIN TA = 70°C VOUT - Output Voltage - V rDS(ON) - Drain-Source On-State Resistance - W 0.7 TA = 0°C TA = -20°C TA = -40°C 0.2 IOUT = 1 mA 25ºC 2.2 IOUT = 1 mA 85ºC IOUT = 20 mA -40ºC 2.15 IOUT = 20 mA 25ºC IOUT = 20 mA 85ºC 2.1 2.05 0.
PAGE 10
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) 100 TPS62730 VOUT = 2.1V ON/BYP = VIN L = 2.2mH COUT = 2.2mF VIN = 3.6 V 25 VIN = 3.3 V VIN = 3 V VOUT - pktopk - mV PSRR - Power Supply Rejection Ratio - dB 30 20 15 10 VIN = 2.3 V VIN = 2.5 V VIN = 2.7 V 5 90 VIN = 2.7 V, IOUT = 25 mA, 80 COUT = 2.2 mF, L = 2.2 mH 70 60 50 40 30 20 10 0 0 0 10 20 30 40 IOUT - Output Current - mA 50 10 Figure 13.
PAGE 11
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 TYPICAL CHARACTERISTICS (continued) VOUT TPS62730 VOUT = 2.1 V VIN = 3.0 V ON/BYP = VIN IOUT = 1mA L = 2.2 mH COUT = 2.2 mF CLoad = 3.6mF TPS62730 VOUT = 2.1 V VIN = 3.0 V ON/BYP = VIN VOUT IOUT = 18mA L = 2.2 mH COUT = 2.2 mF CLoad = 3.6mF SW SW IL IL Figure 17. DC/DC Mode Operation IOUT = 1mA VOUT TPS62730 VOUT = 2.1 V VIN = 3.0 V ON/BYP = VIN Figure 18. DC/DC Mode Operation IOUT = 18mA IOUT = 50mA L = 2.
PAGE 12
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) IOUT = 1mA to 50mA L = 2.2 mH COUT = 2.2 mF CLoad = 3.6mF TPS62730 VOUT = 2.1 V VIN = 3.0V ON/BYP = VIN Automatic Bypass Mode 2.1V TPS62730 VOUT = 2.1 V VIN = 1.9V to 2.6V ON/BYP = VIN 1.9V IOUT = 30mA L = 2.2 mH COUT = 2.2 mF CLoad = 3.6mF Status Output 50mA/Div Status Output Figure 21. Automatic Bypass Transition with Falling / Rising Input Voltage VIN Figure 22.
PAGE 13
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 TYPICAL CHARACTERISTICS (continued) 1m 29 900m 800m Output noise [V] 700m 600m Ref. Lev. 1mV RBW 30kHz VBW 20kHz SWT 42ms IBAT NO TPS62730 27 Battery Current - mA TPS62730 VOUT = 2.1 V ON/BYP = VIN RLoad = 82W IOUT = 26mA L = 2.2 mH COUT = 2.2 mF VIN = 2.3V 500m VIN = 3.6V 400m VIN = 3.0V 300m 25 23 21 IBAT With TPS62730 19 VIN = 2.
PAGE 14
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com DETAILED DESCRIPTION The TPS62730 combines a synchronous buck converter for high efficient voltage conversion and an integrated ultra low power bypass switch to support low power modes of modern micro controllers and RF IC's. The synchronous buck converter includes TI's DCS-Control™, an advanced regulation topology, that combines the advantages of hysteretic and voltage mode control architectures.
PAGE 15
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 START UP Once the device is supplied with a battery voltage, the bypass switch is activated. If the ON/BYP pin is set to high, the device operates in bypass mode until the DC/DC converter has settled and can kick in. During start up, high peak currents can flow over the bypass switch to charge up the output capacitor and the additional decoupling capacitors in the system.
PAGE 16
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com ON/BYP VOUT VTSTAT VBAT VOUT DC/DC bypass mode Discharge COUT by system DC/DC kick in STAT tStart Figure 29.
PAGE 17
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 APPLICATION INFORMATION VIN 2.2V - 3.9V* CIN 2.2µF TPS62730 VIN GND SW VOUT COUT 2.2µF ON BYP ON/BYP VOUT 2.1V L 2.2mH Rpullup STAT * At VIN < 2.2V, VOUT tracks VIN Figure 30. Typical Application TPS62730 3V Battery CBUF CIN 2.2µF VIN GND ON/BYP L 2.2mH SW VOUT VCC2540 2.1V COUT 2.2µF STAT Power Down Signal L BEAD VCC2540 1000W @100MHz P1.2 PMUX DVDD 1 DVDD 2 AVDD 6 AVDD 5 AVDD 3 AVDD 1,2,4 DCOUPL 2.
PAGE 18
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com TPS62730 3V Battery CIN 2.2µF CBUF VIN L 2.2mH SW VOUT GND ON/BYP VCC430 COUT 2.2µF 2.1V STAT CC430 P1.1 Power Down Signal VCC430 2x 1µF VCC430 P1.2 DVCC 1,2,3 3x 100nF L BEAD 12nH 2x 2pF 5x 100nF AVCC_RF/Guard 1,2,3,4 AVCC VCC430 1x 1µF 1x 100nF CC430 power supply decoupling capacitors Figure 32.
PAGE 19
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR) The TPS62730 is optimized to operate with effective inductance values in the range of 1.5μH to 3μH and with effective output capacitance in the range of 1.0μF to 10μF. The internal compensation is optimized to operate with an output filter of L = 2.2μH and COUT = 2.2μF, which gives and LC output filter corner frequency of: fC = 1 2 ´ p ´ (2.2 mH ´ 2.
PAGE 20
TPS62732, TPS62733 TPS62730 SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 www.ti.com ADDITIONAL DECOUPLING CAPACITORS In addition to the output capacitor there are further decoupling capacitors connected to the output of the TPS62730. These decoupling capacitor are placed closely at the RF transmitter or micro controller. The total capacitance of these decoupling capacitors should be kept to a minimum and should not exceed the values given in the reference designs, see Figure 31 and Figure 32.
PAGE 21
TPS62732, TPS62733 TPS62730 www.ti.com SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012 These are the basic signals that need to be measured when evaluating a switching converter. When the switching waveform shows large duty cycle jitter or the output voltage or inductor current shows oscillations, the regulation loop may be unstable. This is often a result of board layout and/or L-C combination. As a next step in the evaluation of the regulation loop, the load transient response is tested.
PAGE 22
PACKAGE OPTION ADDENDUM www.ti.
PAGE 23
PACKAGE OPTION ADDENDUM www.ti.com 24-Jan-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PAGE 24
PACKAGE MATERIALS INFORMATION www.ti.com 19-Dec-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing TPS62730DRYR SON DRY 6 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 5000 179.0 8.4 1.2 1.65 0.7 4.0 8.0 Q1 TPS62730DRYT SON DRY 6 250 179.0 8.4 1.2 1.65 0.7 4.0 8.0 Q1 TPS62732DRYR SON DRY 6 5000 179.0 8.4 1.2 1.65 0.7 4.0 8.
PAGE 25
PACKAGE MATERIALS INFORMATION www.ti.com 19-Dec-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS62730DRYR SON DRY 6 5000 203.0 203.0 35.0 TPS62730DRYT SON DRY 6 250 203.0 203.0 35.0 TPS62732DRYR SON DRY 6 5000 203.0 203.0 35.0 TPS62732DRYT SON DRY 6 250 203.0 203.0 35.0 TPS62733DRYR SON DRY 6 5000 203.0 203.0 35.0 TPS62733DRYT SON DRY 6 250 203.0 203.0 35.
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