Features Efficiency up to 97% 4V to 14V input voltage range 1.5V to 5.0V adjustable output voltage 0.1 Switch On Resistance 300 kHz fixed frequency internal oscillator 7 µA shutdown current Patented current sensing for current mode control Input undervoltage lockout Output overvoltage shutdown protection Output undervoltage shutdown protection Adjustable soft-start Adjustable PGOOD delay Current limit and thermal shutdown 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. Synchronous rectification is used to achieve up to 97% efficiency. At light loads, the LM2653 enters a low power hysteretic or "sleep" mode to keep the efficiency high. In many applications, the efficiency still exceeds 80% at 15 mA load. A shutdown pin is available to disable the LM2653 and reduce the supply current to 7µA. All the power, control, and drive functions are integrated within the ICs. The ICs contain patented current sensing circuity for current mode control. This feature eliminates the external current sensing resistor required by other current-mode DC-DC converters. The ICs have a 300 kHz fixed frequency internal oscillator. The high oscillator frequency allows the use of extremely small, low profile components. Protection features include thermal shutdown, input undervoltage lockout, adjustable soft-start, cycle by cycle current limit, output overvoltage and undervoltage protections. Applications Webpad Personal digital assistants (PDAs) Computer peripherals Battery-powered devices Notebook computer video supply Handheld scanners GXM I/O and core voltage High efficiency 5V conversion

Also Recommended LM20242▲ 36V Vin 2A PWM Sync Buck Regulator LM20323▲ 36V Vin 3A PWM Sync Buck Regulator LM26001▲ Wider Operating Voltage Range, Programmable Frequency, Better Transient Response & Lower Iq Shutdown LM2852▲ 2A Synch Buck Regulator For Low Voltage Applications LM2854▲ 4A Synch Buck Regulator For Low Voltage Applications LM3100▲ 36V 1.5A Synchronous Buck Regulator LM2650▲ 3A Integrated Synchronous Regulator W/ Adj Frequency And Sync Pin

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Parameters / Values	LM2653	LM20242	LM20323	LM26001	LM2852	LM2854	LM3100	LM2650
Output Current	1500 mA	2000 mA	3000 mA	1500 mA	2000 mA	4000 mA	1500 mA	3000 mA
Input Min Voltage	4 Volt	4.5 Volt	4.5 Volt	3 Volt	2.85 Volt	2.95 Volt	4.5 Volt	4.5 Volt
Input Max Voltage	14 Volt	36 Volt	36 Volt	38 Volt	5.5 Volt	5.5 Volt	36 Volt	18 Volt
Output Min	1.5 Volt	0.8 Volt	0.8 Volt	1.25 Volt	1.8, 1, 2.5, 1.2, 0.8, 3.3, 1.5 Volt	0.8 Volt	0.8 Volt	1.5 Volt
Output Max	5 Volt	32 Volt	32 Volt	35 Volt	1.8, 1, 2.5, 1.2, 0.8, 3.3, 1.5 Volt	5 Volt	7 Volt	16 Volt
Frequency Min	300 kHz	100 kHz	Undefined kHz	150 kHz	500, 1500 kHz	500 kHz	Undefined kHz	90 kHz
Frequency Max	300 kHz	1000 kHz	Undefined kHz	500 kHz	500, 1500 kHz	1000 kHz	1000 kHz	300 kHz
Efficiency (peak)	97 %	96 %	94 %	93 %	95 %	98 %	86 %	95 %
Integrated Inductor	No	No	No		No	No	No	No
PowerGood / Error Flag	Yes	Yes	Yes	Yes	No	No	No	No
SoftStart	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Sync Pin	No	No	No	Yes	No	No	No	Yes
Inverting	No	No	No	No	No	No	No	No
Flyback	No	No	No	No	No	No	No	No
RegType	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator
Temperature Min	-40 deg C	-40 deg C	-40 deg C	-40 deg C	-40 deg C	-40 deg C	-40 deg C	-40 deg C
Temperature Max	125 deg C	125 deg C	125 deg C	125 deg C	125 deg C	85 deg C	125 deg C	125 deg C
Adjustable Output	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes
Adj Switch Frequency	No	Yes	No	Yes	No	No	Yes	Yes
PWM Mode	Current Mode Control	Current Mode Control	Current Mode Control	Current	Voltage Mode Control	Voltage Mode Control	Constant On-time	Current Mode Control
Topology	Synchronous Buck	Synchronous Buck	Synchronous Buck	Buck	Synchronous Buck	Synchronous Buck	Synchronous Buck	Synchronous Buck
Special Features	Max. Iq at shutdown is 20uA over full temp range, 7uA typical	Undefined	Undefined	High efficiency sleep mode, 1.5% output voltage accuracy, Quiescent current 40uA	Internal compensation, low standby current	Undefined	Vin feed forward and Current Injection compensation, SIMPLE SWITCHER synchronous regulator	Max. Iq at shutdown is 25uA over full temp. range
Step-Down	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Multiple Output Capability	No	No	No	No	No	No	No	No
Output Power	Undefined Watt	Undefined Watt	Undefined Watt	Undefined Watt	Undefined Watt	Undefined Watt	Undefined Watt	Undefined Watt
Output Voltage	Undefined Volt	Undefined Volt	Undefined Volt	Undefined Volt	1.8, 1, 2.5, 1.2, 0.8, 3.3, 1.5 Volt	Undefined Volt	Undefined Volt
Output Range	1.5V to 5.0V	Undefined	Undefined	1.25V to 35V	0.8V to 3.3V	Undefined	0.8V to 7V	1.5V to16V
Switching Frequency	300 kHz	1000 kHz	500 kHz	Undefined kHz	500 kHz	Undefined kHz	1000 kHz	90 kHz
Feedback Voltage	Undefined Volt	0.8 Volt	0.8 Volt	1.23 Volt	Undefined Volt	Undefined Volt	Undefined Volt	Undefined Volt
On/Off Pin	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Regulator Family	Undefined	LM20k	LM20k	Undefined	SIMPLE SWITCHER	SIMPLE SWITCHER	SIMPLE SWITCHER	Undefined
AEC Q-100 Automotive Grade	Undefined	Undefined	Undefined	1	Undefined	Undefined		Undefined
Synchronous Rectification	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes

Datasheets

Title		Size	Date	Other Language
	LM2653 1.5A High Efficiency Synchronous Switching Regulator	665 Kbytes	14-Apr-05	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1133: Application Note 1133 LM2653EVAL 1.5A Synchronous Switching Regulator Evaluation Board	76 Kbytes	4-Oct-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2653MTC-ADJ/NOPB LM2653MTC-ADJ RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 563 AVNET-EM Worldwide 80 DIGI-KEY Worldwide 281 MOUSER Worldwide 154 RS COMPONENTS Worldwide 1 TAYLOR Americas 808	$1.95 each at 1K+ pcs	rail of 92
LM2653MTCX-ADJ/NOPB LM2653MTCX-ADJ RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.95 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM2653.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM2653 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2653-ADJEVAL	1.5A High Efficiency Synchronous Switching Regulator	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$50.90 each	1
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. Features: Efficiency up to 97% 4V to 14V input voltage range 1.5V to 5.0V adjustable output voltage 0.1 W Switch On resistance 300 kHz fixed frequency internal oscillator 7 uA shutdown current Patented current sensing for current mode control Input undervolatage lockout Output overvoltage shutdown protection Output undervoltage shutdown protection Adjustable soft-start Adjustable PGOOD delay Current limit and thermal shutdown Contents: A fully assembled LM2653 Evaluation Board Application Note LM2653 Datasheet

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM2653MTC-ADJ/NOPB LM2653MTC-ADJ	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	N/A	NSZXYTT 2653MT C-ADJ
LM2653MTCX-ADJ/NOPB LM2653MTCX-ADJ	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	N/A	NSZXYTT 2653MT C-ADJ

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM2653.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM2653 is located at RoHS Status.

CAD Symbols and Models Download LM2653 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2653MTC-ADJ	ABCD150	0	42680	0	0	6394000	1	1814314958
LM2653MTCX-ADJ	ABCD150	0	42680	0	0	6394000	1	1814314958

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM2653.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM2653 is located at RoHS Status.