Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Boost SON 8

1MW

100nF

VIN

MBR0530

GND

CTRL

PGND

TPS61045

Enable/LCDbiascontrol

4.7 Fm

Cff

22pF

4.7 Hm

2.2MW

1 Fm

16.2Vto18.9V/10mA

180kW

V =1.8Vto6V

TPS61045

www.ti.com

SLVS440B –JANUARY 2003–REVISED MARCH 2009

DIGITALLY ADJUSTABLE BOOST CONVERTER

Check for Samples: TPS61045

FEATURES

DESCRIPTION

• Input Voltage Range . . . 1.8 V to 6 V

• Output voltage of up to 28V possible

The TPS61045 is a high frequency boost converter

with digitally programmable output voltage and true

• Up to 85% Efficiency

shutdown. During shutdown, the output is

• Digitally Adjustable Output Voltage Control

disconnected from the input by opening the internal

• Disconnects Output From Input During

input switch. This allows a controlled power up/down

Shutdown sequencing of the display. The output voltage can be

increased or decreased in digital steps by applying a

• Switching Frequency . . . Up to 1 MHz

logic signal to the CTRL pin. The output voltage

• No Load Quiescent Current . . . 40 mA Typ

range, as well as the output voltage step size, can be

• Thermal Shutdown Mode

programmed with the feedback divider network. With

a high switching frequency of up to 1 MHz, the

• Shutdown Current . . . 0.1 mA Typ

TPS61045 allows the use of small external

• Available in Small 3mm × 3mm QFN package

components and together, with the small 8-pin QFN

package, a minimum system solution size is

APPLICATIONS

achieved.

• LCD Bias Supply For Small to Medium LCD

Displays

• OLED Display Power Supply

– PDA, Pocket PC, Smart Phones

– Handheld Devices

– Cellular Phones

Figure 1. Typical Application

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 (21 pages)

PAGE 1
TPS61045 www.ti.com SLVS440B – JANUARY 2003 – REVISED MARCH 2009 DIGITALLY ADJUSTABLE BOOST CONVERTER Check for Samples: TPS61045 FEATURES 1 • • • • • • • • • • Input Voltage Range . . . 1.8 V to 6 V Output voltage of up to 28V possible Up to 85% Efficiency Digitally Adjustable Output Voltage Control Disconnects Output From Input During Shutdown Switching Frequency . . . Up to 1 MHz No Load Quiescent Current . . . 40 mA Typ Thermal Shutdown Mode Shutdown Current . . . 0.
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TPS61045 SLVS440B – JANUARY 2003 – REVISED MARCH 2009 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. ORDERING INFORMATION (1) (1) TA 8 Pin QFN Package (DRB) Package Marking –40°C to 85°C TPS61045DRB BHT The DRB package is available taped and reeled. Add R suffix (TPS61045DRBR) to order quantities of 3000 units per reel.
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TPS61045 www.ti.com SLVS440B – JANUARY 2003 – REVISED MARCH 2009 ELECTRICAL CHARACTERISTICS VIN = 2.4 V, CTRL = VIN, VO = 18 V, IO = 10 mA, TA = –40°C to 85°C, typical values are at TA = 25° C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Supply current VIN Input voltage range 1.8 6 V IQ Operating quiescent current IO = 0 mA, not switching IO(SD) Shutdown current CTRL = GND 40 65 mA 0.1 1 UVLO Undervoltage lockout threshold VIN falling 1.5 mA 1.
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TPS61045 SLVS440B – JANUARY 2003 – REVISED MARCH 2009 www.ti.com DRB PACKAGE (TOP VIEW) 8 SW L 1 VIN 2 DO 3 Exposed Thermal Pad FB 4 7 PGND 6 GND 5 CTRL The Exposed Thermal Pad is connected to PGND. Connect this pad directly with the GND pin. PIN FUNCTIONS PIN NAME NO. I/O DESCRIPTION CTRL 5 I Combined enable and digital output voltage programming pin. Pulling CTRL constantly high enables the device.
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TPS61045 www.ti.com SLVS440B – JANUARY 2003 – REVISED MARCH 2009 Typical Characteristics Table 1.
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TPS61045 SLVS440B – JANUARY 2003 – REVISED MARCH 2009 www.ti.com Quiescent Current vs Input Voltage Feedback Voltage vs Temperature 1.238 VIN = 2.4 V o TA = 85 C 50 V(fb) - Feedback Voltage - V IDD(Q) - Quiescent Current - mA 60 o TA = 25 C 40 TA = - 40oC 30 20 10 1.237 1.236 1.235 1.234 1.233 0 1.8 2.4 3.0 3.6 4.2 4.8 5.4 - 40 6.0 Figure 5.
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TPS61045 www.ti.com SLVS440B – JANUARY 2003 – REVISED MARCH 2009 Space rDS(on) Input Switch Q1 vs Input Voltage Space V(DO) Voltage vs CTRL Input Step 1.4 o TA = 25 C 1.6 V(DO) – Drop-Out Voltage – V rDS(on) - On-State Resistance - W 1.8 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 VIN = 2.4 V 1.2 1.0 0.8 0.6 0.4 0.2 0.0 1.8 2.4 3.0 3.6 4.2 4.8 5.4 6.0 0 8 16 VIN - Input Voltage - V 24 32 40 48 56 64 Input Step Number Figure 10. Figure 11.
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TPS61045 SLVS440B – JANUARY 2003 – REVISED MARCH 2009 www.ti.com DETAILED DESCRIPTION OPERATION The TPS61045 operates with an input voltage range of 1.8 V to 6 V and generates output voltages up to 28 V. The device operates in a pulse frequency modulation (PFM) scheme with constant peak current control. This control scheme maintains high efficiency over the entire load current range and, with a switching frequency of up to 1 MHz, the device enables the use of small external components.
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TPS61045 www.ti.com SLVS440B – JANUARY 2003 – REVISED MARCH 2009 DAC OUTPUT (DO) The TPS61045 allows digital adjustment of the output voltage using the digital CTRL interface as described in the next section. The DAC output pin (DO) drives an external resistor (R3) connected to the external feedback divider. The DO output has a typical output voltage range from 0 V to Vref (1.233V).
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TPS61045 SLVS440B – JANUARY 2003 – REVISED MARCH 2009 www.ti.com APPLICATION INFORMATION INDUCTOR SELECTION, MAXIMUM LOAD CURRENT Since the PFM peak current control scheme is inherently stable the inductor and capacitor value does not affect the stability of the regulator. The selection of the inductor together with the nominal load current, input, and output voltage of the application determines the switching frequency of the converter. Depending on the application, inductor values between 2.
PAGE 11
TPS61045 www.ti.com SLVS440B – JANUARY 2003 – REVISED MARCH 2009 Iload max = h IP ´ VIN 2 ´ VO tf≤ 400 ns Iload max = h IP 2 ´ L ´ VIN (VO ´ VI )´(2 ´IP ´ L + 2 ´ 400 ns ´ VIN ) with: L = selected inductor value h = expected converter efficiency (typically between 70% to 85%) IP = peak current as described in the previous peak current control section.
PAGE 12
TPS61045 SLVS440B – JANUARY 2003 – REVISED MARCH 2009 www.ti.com To reduce the overall operating quiescent current in battery powered applications a high impedance voltage divider must be used with a typical value for R2 of ≤ 200 kΩ and a maximum value for R1 of 2.2 MΩ. Some applications may not need the digital interface to program the output voltage. In this case the output DO can be left open as shown in Figure 18 and the output voltage is calculated as for any standard boost converter: V O + 1.
PAGE 13
TPS61045 www.ti.com SLVS440B – JANUARY 2003 – REVISED MARCH 2009 INPUT CAPACITOR SELECTION The input capacitor (C1) filters the high frequency noise to the control circuit and must be directly connected to the input pin (VIN) of the device. The capacitor (C2) connected to the L pin of the device is the input capacitor for the power stage. The main purpose of the capacitor (C2), that is connected directly to the L pin, is to smooth the inductor current.
PAGE 14
TPS61045 SLVS440B – JANUARY 2003 – REVISED MARCH 2009 www.ti.com TYPICAL APPLICATIONS L1 4.7 mH LQH32CN4R7M11 C2 4.7 mF VCC = 1.8 V to 6 V C1 100 nF D1 Zetex ZHZS400 VO 16.2 V to 18.9 V/ 10 mA Cff 22 pF R1 2.2 MΩ L SW VIN DO CTRL FB C3 1 mF R3 1 MΩ GND PGND R2 180 kW TPS61045 Enable / LCD Bias Control Figure 17. Typical Application With Digital Adjusted Output Voltage L1 4.7 mH LQH32CN4R7M11 D1 Zetex ZHZS400 C2 4.7 mF VCC = 1.8 V to 6 V C1 100 nF R1 2.
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 14-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 TPS61045DRBR SON DRB 8 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS61045DRBT SON DRB 8 250 180.0 12.4 3.3 3.3 1.1 8.0 12.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS61045DRBR SON DRB 8 3000 367.0 367.0 35.0 TPS61045DRBT SON DRB 8 250 210.0 185.0 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.