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See Technical Specifications

LM5085MYX/NOPB

4.5-75V Wide Vin, Constant On-Time Non-Synchronous PFET Buck Controller

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LM5085MYX/NOPB
Datasheet:

LM5085MYX/NOPB Datasheet (PDF)
Vin (min) (V):

4.5
Vin (max) (V):

75
Vout (min) (V):

1.25
Vout (max) (V):

75
EDA/CAD Models:

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Tel: +852 95804164

LM5085MYX/NOPB General Description

The LM5085 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5-V to 75-V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation, and results in ultrafast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the R_DS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.

Key Features

LM5085-Q1 is an Automotive Grade Product that
is AEC-Q100 Grade 1 Qualified (–40°C to 125°C
Operating Junction Temperature)
Wide 4.5-V to 75-V Input Voltage Range
Adjustable Current Limit Using R_DS(ON) or a
Current Sense Resistor
Programmable Switching Frequency to 1MHz
No Loop Compensation Required
Ultra-Fast Transient Response
Nearly Constant Operating Frequency with Line
and Load Variations
Adjustable Output Voltage from 1.25 V
Precision ±2% Feedback Reference
Capable of 100% Duty Cycle Operation
Internal Soft-start Timer
Integrated High Voltage Bias Regulator
Thermal Shutdown
Package:
- HVSSOP-8
- VSSOP-8
- WSON-8

Specifications

Vin (min) (V)	4.5	Vin (max) (V)	75
Vout (min) (V)	1.25	Vout (max) (V)	75
Iout (max) (A)	10	Iq (typ) (mA)	1.3
Switching frequency (min) (kHz)	50	Switching frequency (max) (kHz)	1000
Features	Adjustable current limit, Enable, Frequency synchronization	Operating temperature range (°C)	-40 to 125
Regulated outputs (#)	1	Number of phases	1
Rating	Catalog	Control mode	Constant on-time (COT)
Type	Controller	feature-topology	Step Down
feature-number-of-outputs	1	feature-output-voltage-v	1.25 to 75
feature-minimum-output-current-a		feature-maximum-output-current-a	10
feature-minimum-input-voltage-v	4.5	feature-maximum-switching-frequency-khz	1000
feature-maximum-input-voltage-v	75	feature-operating-supply-voltage-v	4.5 to 75
feature-maximum-supply-current-ma	1.3(Typ)	feature-maximum-power-dissipation-mw
feature-minimum-switching-frequency-khz		feature-synchronous-rectifier
feature-synchronous-clock		feature-packaging	Tape and Reel
feature-rad-hard		feature-pin-count	8
feature-cecc-qualified	No	feature-esd-protection	Yes
feature-military	No	feature-aec-qualified	No
feature-aec-qualified-number		feature-auto-motive	No
feature-p-pap	No	feature-eccn-code	EAR99
feature-svhc	No	feature-svhc-exceeds-threshold	No