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LM2653

www.ti.com

SNVS050E –NOVEMBER 1999–REVISED APRIL 2013

LM2653 1.5A High Efficiency Synchronous Switching Regulator

Check for Samples: LM2653

FEATURES

DESCRIPTION

The LM2653 switching regulator provides high

• Efficiency up to 97%

efficient power conversion over a 100:1 load range

• 4V to 14V Input Voltage Range

(1.5A to 15 mA). This feature makes the LM2653 an

• 1.5V to 5.0V Adjustable Output Voltage

ideal fit in battery-powered applications.

• 0.1Ω Switch On Resistance

Synchronous rectification is used to achieve up to

• 300 kHz Fixed Frequency Internal Oscillator

97% efficiency. At light loads, the LM2653 enters a

low power hysteretic or “sleep” mode to keep the

• 7 μA Shutdown Current

efficiency high. In many applications, the efficiency

• Patented Current Sensing for Current Mode

still exceeds 80% at 15 mA load. A shutdown pin is

Control

available to disable the LM2653 and reduce the

• Input Undervoltage Lockout

supply current to 7µA.

• Output Overvoltage Shutdown Protection

All the power, control, and drive functions are

integrated within the ICs. The ICs contain patented

• Output Undervoltage Shutdown Protection

current sensing circuity for current mode control. This

• Adjustable Soft-Start

feature eliminates the external current sensing

• Adjustable PGOOD Delay

resistor required by other current-mode DC-DC

• Current Limit and Thermal Shutdown

converters.

The ICs have a 300 kHz fixed frequency internal

APPLICATIONS

oscillator. The high oscillator frequency allows the

use of extremely small, low profile components.

• Webpad

• Personal Digital Assistants (PDAs)

Protection features include thermal shutdown, input

undervoltage lockout, adjustable soft-start, cycle by

• Computer Peripherals

cycle current limit, output overvoltage and

• Battery-Powered Devices

undervoltage protections.

• Notebook Computer Video Supply

• Handheld Scanners

• GXM I/O and Core Voltage

• High Efficiency 5V Conversion

Typical Application

Efficiency vs Load Current

= 5V, V

OUT

= 3.3V)

Figure 1. Figure 2.

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 (20 pages)

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LM2653 www.ti.com SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 LM2653 1.5A High Efficiency Synchronous Switching Regulator Check for Samples: LM2653 FEATURES DESCRIPTION • • • • • • • The LM2653 switching regulator provides high efficient power conversion over a 100:1 load range (1.5A to 15 mA). This feature makes the LM2653 an ideal fit in battery-powered applications. 1 2 • • • • • • Efficiency up to 97% 4V to 14V Input Voltage Range 1.5V to 5.0V Adjustable Output Voltage 0.
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LM2653 SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 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. Absolute Maximum Ratings (1) (2) (3) Input Voltage 15V PGOOD Pin Voltage 15V −0.
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LM2653 www.ti.com SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 Electrical Characteristics (continued) Specifications with standard typeface are for TJ = 25°C, and those in boldface type apply over full Operating Temperature Range. VIN = 10V unless otherwise specified. Symbol Parameter Conditions Typical VHYST Sleep Mode Feedback Voltage Hysteresis 24 IQ Quiescent Current 1.
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LM2653 SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 www.ti.com Electrical Characteristics (continued) Specifications with standard typeface are for TJ = 25°C, and those in boldface type apply over full Operating Temperature Range. VIN = 10V unless otherwise specified. Symbol VSHUTDOWN Parameter Shutdown Pin Threshold Voltage Conditions Rising Edge Typical (1) Limit 0.6 0.3 0.
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LM2653 www.ti.com SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 Typical Performance Characteristics Efficiency vs Load Current (VIN = 5V, VOUT = 2.5V) lQ vs VIN Figure 3. Figure 4. IQSD vs Input Voltage IQSD vs Junction Temperature Figure 5. Figure 6. Frequency vs Junction Temperature RSW(ON) vs Input Voltage Figure 7. Figure 8.
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LM2653 SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) RSW(ON) vs Junction Temperature Current Limit vs Input Voltage (VOUT = 2.5V) Figure 9. Figure 10. Current Limit vs Junction Temperature (VOUT = 2.5V) Reference Voltage vs Junction Temperature Figure 11. Figure 12. Sleep Mode Threshold vs Output Voltage (VIN = 5V) Figure 13.
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LM2653 www.ti.com SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 CONNECTION DIAGRAM Figure 14. 16-Lead TSSOP (PW) See Package Number PW0016A PIN DESCRIPTIONS Pin Name Function 1-2 SW Switched-node connection, which is connected with the source of the internal high-side MOSFET. 3-5 VIN Main power supply input pin. Connected to the drain of the high-side MOSFET. 6 VCB Bootstrap capacitor connection for high-side gate drive. 7 AVIN Input voltage for control and driver circuits.
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LM2653 SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 www.ti.com Block Diagram Figure 15.
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LM2653 www.ti.com SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 OPERATION The LM2653 operates in a constant frequency (300 kHz), current-mode PWM for moderate to heavy loads; and it automatically switches to hysteretic mode for light loads. In hysteretic mode, the switching frequency is reduced to keep the efficiency high. MAIN OPERATION When the load current is higher than the sleep mode threshold, the part is always operating in PWM mode.
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LM2653 SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 www.ti.com INDUCTOR The most critical parameters for the inductor are the inductance, peak current and the DC resistance. The inductance is related to the peak-to-peak inductor ripple current, the input and the output voltages: (2) A higher value of ripple current reduces inductance, but increases the conductance loss, core loss, current stress for the inductor and switch devices.
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LM2653 www.ti.com SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 LDELAY CAPACITOR As mentioned in the Operation section, the LDELAY capacitor sets the time delay between the output voltage goes below 80% of its nominal value and the undervoltage latch protection is enabled. Charging the CDELAY by a 5 μA current source up to 2V sets the delay time. Therefore, TDELAY = CDELAY * 2V/5μA. The undervoltage protection is disabled by tying the LDELAY pin to the ground.
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LM2653 SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 www.ti.com PCB Layout Considerations Layout is critical to reduce noises and ensure specified performance. The important guidelines are listed as follows: 1. Minimize the parasitic inductance in the loop of input capacitors and the internal MOSFETs by connecting the input capacitors to VIN and PGND pins with short and wide traces.
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LM2653 www.ti.com SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 Figure 18. Component Side PC Board Layout Figure 19.
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LM2653 SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision D (April 2013) to Revision E • 14 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-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.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing LM2653MTCX-ADJ/NOPB TSSOP PW 16 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.95 B0 (mm) K0 (mm) P1 (mm) 8.3 1.6 8.0 W Pin1 (mm) Quadrant 12.
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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) LM2653MTCX-ADJ/NOPB TSSOP PW 16 2500 367.0 367.0 35.
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