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LM22672QMR-5.0/NOPB

1A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Adjustable Frequency

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LM22672QMR-5.0/NOPB
Datasheet:

LM22672QMR-5.0/NOPB Datasheet (PDF)
Vin (min) (V):

4.5
Vin (max) (V):

42
Vout (min) (V):

1.285
Vout (max) (V):

37
EDA/CAD Models:

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LM22672QMR-5.0/NOPB General Description

The LM22672 switching regulator provides all of the functions necessary to implement an efficient high voltage step-down (buck) regulator using a minimum of external components. This easy to use regulator incorporates a 42 V N-channel MOSFET switch capable of providing up to 1 A of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5 V output and adjustable output voltage options are available.

The default switching frequency is set at 500 kHz allowing for small external components and good transient response. In addition, the frequency can be adjusted over a range of 200 kHz to 1 MHz with a single external resistor. The internal oscillator can be synchronized to a system clock or to the oscillator of another regulator. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typ). An adjustable soft-start feature is provided through the selection of a single external capacitor. The LM22672 also has built in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22672 is a member of Texas Instruments SIMPLE SWITCHER^® family. The SIMPLE SWITCHER^® concept provides for an easy to use complete design using a minimum number of external components and the TI WEBENCH^® design tool. TI's WEBENCH^® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.

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Key Features

Wide Input Voltage Range: 4.5 V to 42V
Internally Compensated Voltage Mode Control
Stable with Low ESR Ceramic Capacitors
200 mΩ N-Channel MOSFET
Output Voltage Options:
-ADJ (Outputs as Low as 1.285 V)
-5.0 (Output Fixed to 5 V)
±1.5% Feedback Reference Accuracy
500 kHz Default Switching Frequency
Adjustable Switching Frequency and Synchronization
–40°C to 125°C Junction Temperature Range
Precision Enable Input
Integrated Boot-Strap Diode
Adjustable Soft-Start
Fully WEBENCH^® Enabled
LM22672-Q1 is an Automotive Grade Product
that is AEC-Q100 Grade 1 Qualified (–40°C to +125°C
Junction Temperature)
SO PowerPAD (Exposed Pad)

Specifications

Vin (min) (V)	4.5	Vin (max) (V)	42
Vout (min) (V)	1.285	Vout (max) (V)	37
Iout (max) (A)	1	Iq (typ) (mA)	3.4
Switching frequency (min) (kHz)	200	Switching frequency (max) (kHz)	1000
Features	Enable, Frequency synchronization, Over Current Protection, Soft Start Fixed	Operating temperature range (°C)	-40 to 125
Rating	Automotive	Regulated outputs (#)	1
Control mode	Voltage mode	Duty cycle (max) (%)	90
Type	Converter	feature-type	Synchronous Step Down
feature-isolation		feature-process-technology
feature-output-type	Fixed	feature-switching-frequency-khz	500(Typ)\|200 to 1000
feature-number-of-outputs	1	feature-output-voltage-v	5
feature-maximum-output-current-a	1	feature-maximum-output-power-w
feature-minimum-input-voltage-v	4.5	feature-maximum-input-voltage-v	42
feature-typical-switch-current-a		feature-efficiency-	90(Min)
feature-packaging	Tube	feature-rad-hard
feature-pin-count	8	feature-cecc-qualified	No
feature-esd-protection	Yes	feature-escc-qualified
feature-military	No	feature-aec-qualified	Yes
feature-aec-qualified-number	AEC-Q100	feature-eccn-code	EAR99
feature-svhc	No	feature-svhc-exceeds-threshold	No