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LM20145QMH/NOPB

Automotive Grade 2.95-5.5V, 5A, Current Mode Synchronous Buck Regulator with Adjustable Frequency

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LM20145QMH/NOPB
Datasheet:

LM20145QMH/NOPB Datasheet (PDF)
Vin (min) (V):

2.95
Vin (max) (V):

5.5
Vout (min) (V):

0.8
Vout (max) (V):

5
EDA/CAD Models:

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LM20145QMH/NOPB General Description

The LM20145 is a full featured adjustable frequency synchronous buck regulator capable of delivering up to 5A of continuous output current. The current mode control loop can be compensated to be stable with virtually any type of output capacitor. For most cases, compensating the device only requires two external components, providing maximum flexibility and ease of use. The device is optimized to work over the input voltage range of 2.95V to 5.5V making it suited for a wide variety of low voltage systems.

The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for increased system reliability. A precision enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault detection and supply sequencing is possible with the integrated power good circuit.

The LM20145 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20145 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The frequency of this device can be adjusted from 250 kHz to 750 kHz by connecting an external resistor from the RT pin to ground.

The LM20145 is offered in a 16-pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks.

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Key Features

Available in AEC-Q100 Temperature Grade 1
Input Voltage Range 2.95V to 5.5V
Accurate Current Limit Minimizes Inductor Size
97% Peak Efficiency
Adjustable Switching Frequency (250 kHz to 750 kHz)
32 mΩ Integrated FET Switches
Starts up into Pre-Biased Loads
Output Voltage Tracking
Peak Current Mode Control
Adjustable Output Voltage down to 0.8V
Adjustable Soft-Start with External Capacitor
Precision Enable Pin with Hysteresis
Integrated OVP, UVLO, Power Good and Thermal Shutdown
HTSSOP 16-Pin Exposed Pad Package

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Specifications

Vin (min) (V)	2.95	Vin (max) (V)	5.5
Vout (min) (V)	0.8	Vout (max) (V)	5
Iout (max) (A)	5	Iq (typ) (mA)	3.5
Switching frequency (min) (kHz)	250	Switching frequency (max) (kHz)	750
Features	Enable, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking	Operating temperature range (°C)	-40 to 125
Rating	Automotive	Regulated outputs (#)	1
Control mode	current mode	Duty cycle (max) (%)	85
Type	Converter	feature-type	Synchronous Step Down
feature-isolation		feature-process-technology
feature-output-type	Adjustable	feature-switching-frequency-khz	260 to 750
feature-number-of-outputs	1	feature-output-voltage-v	0.8 to 5
feature-maximum-output-current-a	5	feature-maximum-output-power-w
feature-minimum-input-voltage-v	2.95	feature-maximum-input-voltage-v	5.5
feature-typical-switch-current-a		feature-efficiency-	97
feature-packaging	Tube	feature-rad-hard
feature-pin-count	16	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-auto-motive	Yes
feature-p-pap	Yes	feature-eccn-code	EAR99
feature-svhc	No	feature-svhc-exceeds-threshold	No