Features Ideal load and line transient responses 5V to 30V input range On-chip gate drive Convenient CLK_EN# signal Input under-voltage lockout High light-load efficiency Adjustable analog soft start Peak current limit Over-voltage protection Error correction for good static accuracy ±1% DAC accurcy over temperature Interfaces with the LM2647 system supply Available in TSSOP or tiny LLP package Description The LM27213 is a single-phase synchronous buck regulator controller designed to fully support a portable microprocessor. On-chip gate drive makes for a compact, single chip solution. Output currents in excess of 25 Amps are possible. The IC employs a current mode hysteretic control mechanism. Inductor current is sensed through a low value sense resistor. The LM27213 will operate over an input voltage range of 5V to 30V. The output voltage is programmed through 6 Voltage Identification (VID) pins and ranges from 0.700V to 1.708V in 64 steps. Since the error in the output voltage directly sets the inductor current, the dynamic response to a large, fast load transient is close to a square wave. This is optimal for mode transition requirements. Also, due to the intrinsic input voltage feedforward characteristic of hysteretic control, the line transient response is excellent as well. The IC provides cycle-by-cycle peak current limit, over-voltage protection, and a power good signal. The LM27213 fully supports the Stop CPU and Sleep modes offered by some processors. When enabled, the IC enters a power-saving "diode emulator" mode which helps prolong battery runtime for portable systems. The LM27213 also has a soft start feature for the external adjustment of soft start speed. Applications Core voltage supply for Low Power Processors Low voltage high current buck regulators Benefits Single chip core power solution Minimum output capacitance required Low cost, compact design

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

Datasheets

Title		Size	Date	Other Language
	LM27213 Single Phase Hysteretic Buck Controller	962 Kbytes	7-Feb-06

Application Notes

Title		Size	Date	Other Language
	AN-1487: Application Note 1487 Current Mode Hysteretic Buck Regulators	558 Kbytes	29-Aug-06	日本語 中文

Other Technical Documents

Title		Type	Date
	Hitchhiker's Ride to the World of Current Mode Control	External Article	2007-07-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM27213MTD/NOPB LM27213MTD RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 TECHMOSA Asia Pacific 27	$3.25 each at 1K+ pcs	rail of 38
LM27213MTDX/NOPB LM27213MTDX RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 TECHMOSA Asia Pacific 1000	$3.25 each at 1K+ pcs	reel of 1000
LM27213SQ/NOPB LM27213SQ RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 TECHMOSA Asia Pacific 1000	$3.25 each at 1K+ pcs	reel of 250
LM27213SQX/NOPB LM27213SQX RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$3.25 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 LM27213.

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 LM27213 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM27213MTD/NOPB LM27213MTD	201.231 202.002	TSSOP	48	2 2	260 235	Detail	Download	N/A	NSUZXYTTE# 27213MTD
LM27213MTDX/NOPB LM27213MTDX	201.231 202.002	TSSOP	48	2 2	260 235	Detail	Download	N/A	NSUZXYTTE# 27213MTD
LM27213SQ/NOPB LM27213SQ	123.191 123.695	LLP	48	2 2	260 260	Detail	Download	N/A	NS UZXYTTE# 27213SQ
LM27213SQX/NOPB LM27213SQX	123.191 123.695	LLP	48	2 2	260 260	Detail	Download	N/A	NS UZXYTTE# 27213SQ

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 LM27213.

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 LM27213 is located at RoHS Status.

CAD Symbols and Models Download LM27213 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM27213MTD	ABCD150	0	42680	0	0	6394000	1	1814314958
LM27213MTDX	ABCD150	0	42680	0	0	6394000	1	1814314958
LM27213SQ	ABCD150	0	42680	0	0	6394000	1	1814314958
LM27213SQX	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 LM27213.

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 LM27213 is located at RoHS Status.