LMZ14202 SIMPLE SWITCHER® 6V to 42V, 2A Power Module in Leaded SMT-TO Package

1 Features

Integrated Shielded Inductor
Simple PCB Layout
Flexible Start-Up Sequencing Using External Soft-Start and Precision Enable
Protection Against Inrush Currents and Faults Such as Input UVLO and Output Short Circuit
Junction Temperature Range: –40°C to 125°C
Single Exposed Pad and Standard Pinout for Easy Mounting and Manufacturing
Fast Transient Response for Powering FPGAs and ASICs
Low Output Voltage Ripple
Pin-to-Pin Compatible Family:
- LMZ14203/2/1 (42 V Maximum; 3 A, 2 A, 1 A)
- LMZ12003/2/1 (20 V Maximum; 3 A, 2 A, 1 A)
Fully Enabled for WEBENCH® Power Designer
Electrical Specifications
- 12-W Maximum Total Output Power
- Up to 2-A Output Current
- Input Voltage Range: 6 V to 42 V
- Output Voltage Range: 0.8 V to 6 V
- Efficiency up to 90%
Performance Benefits
- Operates at High Ambient Temperature With No Thermal Derating
- High Efficiency Reduces System Heat Generation
- Low Radiated Emissions (EMI) Tested With EN55022 Class B Standard
- Low External Component Count

2 Applications

Point of Load Conversions from 12-V and 24-V Input Rail
Time-Critical Projects
Space Constrained and High Thermal Requirement Applications Easy-To-Use, 7-Pin Package
PFM 7-Pin Package
Negative Output Voltage Applications
(See AN-2027) SNVA425

3 Description

The LMZ14202, SIMPLE SWITCHER® power module is an easy-to-use step-down DC-DC that can drive up to 2-A load with exceptional power conversion efficiency, line and load regulation, and output accuracy. The LMZ14202 is available in an innovative package that enhances thermal performance and allows for hand or machine soldering.

The LMZ14202 can accept an input voltage rail between 6 V and 42 V and deliver an adjustable and highly accurate output voltage as low as 0.8 V. The LMZ14202 only requires three external resistors and four external capacitors to complete the power solution. The LMZ14202 is a reliable and robust design with the following protection features: thermal shutdown, input undervoltage lockout, output overvoltage protection, short-circuit protection, output current limit, and allows start-up into a prebiased output. A single resistor adjusts the switching frequency up to 1 MHz.

Device Information⁽¹⁾⁽²⁾

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LMZ14202	TO-PMOD (7)	10.16 mm × 9.85 mm

For all available packages, see the orderable addendum at the end of the datasheet.
Peak reflow temperature equals 245°C. See SNAA214 for more details.

Simplified Application Schematic

Efficiency 12-V Input at 25°C

4 Revision History

Changes from I Revision (August 2015) to J Revision

Added this new bullet to the Power Module SMT Guidelines sectionGo

Changes from H Revision (June 2015) to I Revision

Changed the title of the documentGo

Changes from G Revision (March 2013) to H Revision

Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
Removed Easy-To-Use 7-Pin Package PFM 7-Pin Package imageGo

Changes from F Revision (October 2012) to G Revision

Changed layout of National Data Sheet to TI formatGo
Added Power Module SMT Guidelines sectionGo

5 Pin Configuration and Functions

NDW Package

7-Pin TO-PMOD

Top View

Pin Functions

PIN		TYPE	DESCRIPTION
NAME	NO.	TYPE	DESCRIPTION
EN	3	Analog	Enable. Input to the precision enable comparator. Rising threshold is 1.18 V nominal, 90 mV hysteresis nominal. Maximum recommended input level is 6.5 V.
FB	6	Analog	Feedback. nternally connected to the regulation, overvoltage, and short-circuit comparators. The regulation reference point is 0.8 V at this input pin. Connected the feedback resistor divider between the output and ground to set the output voltage.
GND	4	Ground	Ground. Reference point for all stated voltages. Must be externally connected to thermal pad.
RON	2	Analog	ON-time resistor. An external resistor between this pin and the VIN pin sets the ON-time of the application. Typical values range from 25 kΩ to 124 kΩ.
SS	5	Analog	Soft-start. An internal 8-µA current source charges an external capacitor to produce the soft-start function. This node is discharged at 200 µA during disable, over-current, thermal shutdown and internal UVLO conditions.
VIN	1	Power	Supply input. Nominal operating range is 6 V to 42 V . A small amount of internal capacitance is contained within the package assembly. Additional external input capacitance is required between this pin and exposed pad.
VOUT	7	Power	Output voltage. Output from the internal inductor. Connect the output capacitor between this pin and exposed pad.
Thermal pad		Ground	Exposed Pad — Internally connected to pin 4. Used to dissipate heat from the package during operation. Must be electrically connected to pin 4 external to the package.

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) ⁽¹⁾⁽²⁾

		MIN	MAX	UNIT
	VIN, RON to GND	–0.3	43.5	V
	EN, FB, SS to GND	–0.3	7	V
T_J	Junction temperature		150	°C
	Peak reflow case temperature (30 s)		245	°C
T_stg	Storage temperature	–65	150	°C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) For soldering specifications, refer to the following document: www.ti.com/lit/snoa549c

6.2 ESD Ratings

			VALUE	UNIT
V_(ESD)	Electrostatic discharge	Human body model (HBM), per ANSI/ESDA/JEDEC JS-001⁽¹⁾	±2000	V

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

		MIN	MAX	UNIT
V_IN	Input voltage	6	42	V
EN	Enable voltage	0	6.5	V
T_J	Junction temperature	−40	125	°C

6.4 Thermal Information

THERMAL METRIC⁽¹⁾			LMZ14202	UNIT
			NDW (TO-PMOD)
			7 PINS
R_θJA	Junction-to-ambient thermal resistance	4-layer JEDEC Printed circuit board, 100 vias, No air flow	19.3	°C/W
R_θJA	Junction-to-ambient thermal resistance	2-layer JEDEC Printed circuit board, No air flow	21.5	°C/W
R_θJC(top)	Junction-to-case (top) thermal resistance	No air flow	1.9	°C/W

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

Limits in standard type are for T_J = 25°C only; limits in boldface type apply over the junction temperature (T_J) range of –40°C to +125°C. Minimum and maximum limits are ensured through test, design or statistical correlation. Typical values represent the most likely parametric norm at T_J = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: V_VIN = 24 V, V_VOUT = 3.3 V

PARAMETER		TEST CONDITIONS		MIN⁽¹⁾	TYP⁽²⁾	MAX⁽¹⁾	UNIT
ENABLE CONTROL⁽³⁾
V_EN	EN threshold trip point	V_EN rising			1.18		V
V_EN	EN threshold trip point	V_EN rising	–40°C ≤ T_J ≤ 125°C	1.1		1.25	V
V_EN-HYS	EN threshold hysteresis	V_EN falling			90		mV
SOFT-START
I_SS	SS source current	V_SS = 0 V			8		µA
I_SS	SS source current	V_SS = 0 V	–40°C ≤ T_J ≤ 125°C	5		11	µA
I_SS-DIS	SS discharge current				-200		µA
CURRENT LIMIT
I_CL	Current limit threshold	d.c. average			2.6		A
I_CL	Current limit threshold	d.c. average	–40°C ≤ T_J ≤ 125°C	2.3		3.65	A
ON/OFF TIMER
t_ON-MIN	ON timer minimum pulse width				150		ns
t_OFF	OFF timer pulse width				260		ns
REGULATION AND OVERVOLTAGE COMPARATOR
V_FB	In-regulation feedback voltage	V_SS > 0.8 V, I_O = 2 A			0.795		V
		V_SS > 0.8 V, I_O = 2 A	–40°C ≤ T_J ≤ 125°C	0.775		0.815	V
		V_SS >+ 0.8 V, I_O = 10 mA		0.786	0.802	0.818	V
V_FB-OV	Feedback over-voltage protection threshold				0.92		V
I_FB	Feedback input bias current				5		nA
I_Q	Non-switching input current	V_FB = 0.86 V			1		mA
I_SD	Shutdown quiescent current	V_EN = 0 V			25		μA
THERMAL CHARACTERISTICS
T_SD	Thermal shutdown	Rising			165		°C
T_SD-HYST	Thermal shutdown hysteresis	Falling			15		°C
PERFORMANCE PARAMETERS
ΔV_O	Output voltage ripple				8		mV_P-P
ΔV_O/ΔV_IN	Line regulation	12 V ≤ V_VIN ≤ 42 V, I_O = 2 A			0.01%
ΔV_O/I_OUT	Load regulation	V_VIN = 24 V			1.5		mV/A
η	Efficiency	V_VIN = 24 V, V_O = 3.3 V, I_O = 1 A			86%
η	Efficiency	V_VIN = 24 V, V_O = 3.3 V, I_O = 2 A			85%

(1) Minimum and maximum limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate Average Outgoing Quality Level (AOQL).

(2) Typical numbers are at 25°C and represent the most likely parametric norm.

(3) EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007. See AN-2024 LMZ1420x / LMZ1200x Evaluation Board (SNVA422) and layout for information on device under test.