Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Boost WSON 14

4.7pF

4.7PH

FREQ

PGND

SGND

BOOT

RF2

100k

22PF

2 Cells

150k

RF1

300k

LM2623

100PF

tan

LM2623

www.ti.com

SNVS188G –MAY 2004–REVISED DECEMBER 2005

LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter

Check for Samples: LM2623

FEATURES

DESCRIPTION

The LM2623 is a high efficiency, general purpose,

• Good Efficiency Over a Very Wide Load Range

step-up DC-DC switching regulator for battery-

• Very Low Output Voltage Ripple

powered and low input voltage systems. It accepts an

• Small, VSSOP-8 Package (Half the Footprint of

input voltage between .8 and 14 volts and converts it

Standard 8 pin SOIC Package)

into a regulated output voltage between 1.24 and 14

volts. Efficiencies up to 90% are achievable with the

• 1.09 mm Package Height

LM2623.

• Up to 2 MHz Switching Frequency

In order to adapt to a number of applications, the

• .8V to 14V Operating Voltage

LM2623 allows the designer to vary the output

• 1.1V Start-up Voltage

voltage, the operating frequency (300kHz to 2 MHz)

• 1.24V - 14V Adjustable Output Voltage

and duty cycle (17% to 90%) to optimize the part's

performance. The selected values can be fixed or can

• Up to 2A Load Current at Low Output Voltages

vary with battery voltage or input to output voltage

• 0.17Ω Internal MOSFET

ratio. The LM2623 uses a very simple, on/off

• Up to 90% Regulator Efficiency

regulation mode to produce good efficiency and

stable operation over a wide operating range. It

• 80 µA Typical Operating Current (into V

normally regulates by skipping switching cycles when

of Supply)

it reaches the regulation limit (Pulse Frequency

• <2.5µA Specified Supply Current In Shutdown

Modulation).

• 4mm x 4mm Thermally Enhanced WSON

Note: Please read the Non-Linear Effect and

Package Option

Choosing The Correct C3 Capacitor sub-sections of

the Design Procedure section of this data sheet, so

APPLICATIONS

that any challenges with designing with this part can

be taken into account before a board design/layout is

• Cameras, Pagers and Cell Phones

finalized.

• PDAs, Palmtop Computers, GPS Devices

For Alternative Solutions, See Also: LM2700,

• White LED Drive, TFT or Scanned LCDs

LM2622, LM2731, LM2733, and LM2621.

• Flash Memory Programming

• Hand-Held Instruments

• 1, 2, 3 or 4 Cell Alkaline Systems

• 1, 2 or 3 Cell Lithium-ion Systems

Typical Application Circuit

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.

2All trademarks are the property of their respective owners.

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 (16 pages)

PAGE 1
LM2623 www.ti.com SNVS188G – MAY 2004 – REVISED DECEMBER 2005 LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter Check for Samples: LM2623 FEATURES DESCRIPTION • • • The LM2623 is a high efficiency, general purpose, step-up DC-DC switching regulator for batterypowered and low input voltage systems. It accepts an input voltage between .8 and 14 volts and converts it into a regulated output voltage between 1.24 and 14 volts. Efficiencies up to 90% are achievable with the LM2623.
PAGE 2
LM2623 SNVS188G – MAY 2004 – REVISED DECEMBER 2005 www.ti.com Connection Diagram Figure 1. WSON Package Top View Figure 2. VSSOP-8 (DGK) Package Top View Pin Description WSON-14 Pin VSSOP-8 Pin 1 Name NC 2, 3 1 PGND 4 2 EN 5 3 FREQ 6 4 Function No Connect Power Ground (WSON Pins 2 & 3 must be shorted together). Active-Low Shutdown Input Frequency Adjust. An external resistor connected between this pin and a voltage source sets the switching frequency of the LM2623.
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LM2623 www.ti.com SNVS188G – MAY 2004 – REVISED DECEMBER 2005 ABSOLUTE MAXIMUM RATINGS (1) (2) −0.5 V to 14.5V SW Pin Voltage −0.5V to 10V BOOT, VDD, EN and FB Pins FREQ Pin 100µA TJmax (3) 150°C −65°C to +150°C Storage Temperature Range Lead Temp. (Soldering, 5 sec) Power Dissipation (TA=25°C) ESD Rating (1) (2) (3) (4) 260°C (3) 500mW (4) 2kV Absolute maximum ratings indicate limits beyond which damage to the device may occur.
PAGE 4
LM2623 SNVS188G – MAY 2004 – REVISED DECEMBER 2005 www.ti.com ELECTRICAL CHARACTERISTICS Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range of −40°C to +85°C. Unless otherwise specified: VDD= VOUT= 3.3V.
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LM2623 www.ti.com SNVS188G – MAY 2004 – REVISED DECEMBER 2005 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs VIN VOUT = 5.0V 95.0 1.2365 10mA 1.236 1.2355 85.0 V FB (V) Efficiency (%) 90.0 80.0 75.0 600mA 1.2345 1.2335 300mA 65.0 V DD = 3.3V 1.235 1.234 70.0 60.0 1.8 VFB vs Temperature 1.233 2.1 2.4 2.7 3.0 3.3 1.2325 -40 3.6 3.9 4.2 4.5 -25 -10 5 Vin Figure 3. 300k 1.5 Start-Up Voltage Frequency (Mhz) 50 65 80 Maximum Start Up Voltage vs Temperature 1.
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LM2623 SNVS188G – MAY 2004 – REVISED DECEMBER 2005 www.ti.com DETAILED DESCRIPTION OPERATING PRINCIPLE The LM2623 is designed to provide step-up DC-DC voltage regulation in battery-powered and low-input voltage systems. It combines a step-up switching regulator, N-channel power MOSFET, built-in current limit, thermal limit, and voltage reference in a single 8-pin VSSOP package Figure 9. The switching DC-DC regulator boosts an input voltage between .8V and 14V to a regulated output voltage between 1.
PAGE 7
LM2623 www.ti.com SNVS188G – MAY 2004 – REVISED DECEMBER 2005 Figure 10. Typical Step-Up Regulator Waveforms PULSE FREQUENCY MODULATION (PFM) Pulse Frequency Modulation is typically accomplished by switching continuously until the voltage limit is reached and skipping cycles after that to just maintain it. This results in a somewhat hysteretic mode of operation. The coil stores more energy each cycle as the current ramps up to high levels.
PAGE 8
LM2623 SNVS188G – MAY 2004 – REVISED DECEMBER 2005 www.ti.com SHUT DOWN The LM2623 features a shutdown mode that reduces the quiescent current to less than a specified 2.5uA over temperature. This extends the life of the battery in battery powered applications. During shutdown, all feedback and control circuitry is turned off. The regulator's output voltage drops to one diode drop below the input voltage. Entry into the shutdown mode is controlled by the active-low logic input pin EN (pinh- 2).
PAGE 9
LM2623 www.ti.com SNVS188G – MAY 2004 – REVISED DECEMBER 2005 OUTPUT DIODE SELECTION A Schottky diode should be used for the output diode. The forward current rating of the diode should be higher than the peak input current, and the reverse voltage rating must be higher than the output voltage. Do not use ordinary rectifier diodes, since slow switching speeds and long recovery times cause the efficiency and the load regulation to suffer. Table 1 shows a list of the diode manufacturers.
PAGE 10
PACKAGE OPTION ADDENDUM www.ti.
PAGE 11
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line.
PAGE 12
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 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 LM2623ALD/NOPB WSON NHE 14 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LM2623AMM VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM2623AMM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.
PAGE 13
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2623ALD/NOPB WSON NHE 14 1000 213.0 191.0 55.0 LM2623AMM VSSOP DGK 8 1000 210.0 185.0 35.0 LM2623AMM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LM2623AMMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0 LM2623LD/NOPB WSON NHE 14 1000 213.0 191.0 55.0 LM2623LDX/NOPB WSON NHE 14 4500 367.0 367.0 35.
PAGE 14
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MECHANICAL DATA NHE0014A LDA14A (REV A) www.ti.
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