LM5008A

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6-95V Wide Vin, 350mA Constant On-Time Non-Synchronous Buck Regulator

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Data sheet

document-pdfAcrobat LM5008A 95-V, 350-mA, Constant On-Time DC/DC Buck Switching Regulator datasheet (Rev. H) PDF | HTML

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LM5163

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100-V input, 0.5-A synchronous buck DC/DC converter with ultra-low IQ Synchronous rectification for smaller footprint and high efficiency and low IQ.

LM5008A

ACTIVE

Data sheet

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Product details

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

0.35

Vin (min) (V)

6

Vin (max) (V)

95

Switching frequency (min) (kHz)

50

Switching frequency (max) (kHz)

600

Features

Enable, Over Current Protection

Control mode

Constant on-time (COT)

Vout (min) (V)

2.5

Vout (max) (V)

75

Iq (typ) (µA)

485

Duty cycle (max) (%)

99

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

0.35

Vin (min) (V)

6

Vin (max) (V)

95

Switching frequency (min) (kHz)

50

Switching frequency (max) (kHz)

600

Features

Enable, Over Current Protection

Control mode

Constant on-time (COT)

Vout (min) (V)

2.5

Vout (max) (V)

75

Iq (typ) (µA)

485

Duty cycle (max) (%)

99

VSSOP (DGK)

8

14.7 mm² 3 x 4.9

WSON (NGU)

8

16 mm² 4 x 4

Operating Input Voltage Range: 6 V to 95 V
Integrated 100-V N-Channel Buck Switch
Internal Start-Up Regulator
No Loop Compensation Required
Ultra-Fast Transient Response
On-Time Varies Inversely With Input Voltage
Operating Frequency Remains Constant With Varying Line Voltage and Load Current
Adjustable Output Voltage From 2.5 V
Highly Efficient Operation
Precision Internal Reference
Low Bias Current
Intelligent Current Limit
Thermal Shutdown
8-Pin VSSOP and 8-Pin WSON Packages
Create a Custom Design Using the LM5008A With the WEBENCH^® Power Designer

Operating Input Voltage Range: 6 V to 95 V
Integrated 100-V N-Channel Buck Switch
Internal Start-Up Regulator
No Loop Compensation Required
Ultra-Fast Transient Response
On-Time Varies Inversely With Input Voltage
Operating Frequency Remains Constant With Varying Line Voltage and Load Current
Adjustable Output Voltage From 2.5 V
Highly Efficient Operation
Precision Internal Reference
Low Bias Current
Intelligent Current Limit
Thermal Shutdown
8-Pin VSSOP and 8-Pin WSON Packages
Create a Custom Design Using the LM5008A With the WEBENCH^® Power Designer

The LM5008A DC/DC converter is a functional variant of the LM5008 COT Buck Switching Regulator. The functional differences of the LM5008A are: the minimum input operating voltage is 6 V, the on-time equation is slightly different, and the requirement for a minimum load current is removed.

The LM5008A 350-mA step-down switching regulator features all of the functions required to implement a low-cost and efficient buck regulator. This high-voltage converter has an integrated 100-V N-channel buck switch and operates over an input voltage range of 6 V to 95 V. The device is easy to implement and is provided in 8-pin VSSOP and the thermally enhanced 8-pin WSON packages. The converter uses PWM control scheme with an on-time inversely proportional to V_IN. This feature allows the operating frequency to remain relatively constant. The control scheme requires no loop compensation. An intelligent current limit is implemented with forced off-time, which is inversely proportional to V_OUT. This scheme ensures short-circuit control while providing minimum foldback. Other features include: thermal shutdown, V_CC undervoltage lockout, gate drive undervoltage lockout, maximum duty cycle limiter, and a pre-charge switch.

The LM5008A DC/DC converter is a functional variant of the LM5008 COT Buck Switching Regulator. The functional differences of the LM5008A are: the minimum input operating voltage is 6 V, the on-time equation is slightly different, and the requirement for a minimum load current is removed.

The LM5008A 350-mA step-down switching regulator features all of the functions required to implement a low-cost and efficient buck regulator. This high-voltage converter has an integrated 100-V N-channel buck switch and operates over an input voltage range of 6 V to 95 V. The device is easy to implement and is provided in 8-pin VSSOP and the thermally enhanced 8-pin WSON packages. The converter uses PWM control scheme with an on-time inversely proportional to V_IN. This feature allows the operating frequency to remain relatively constant. The control scheme requires no loop compensation. An intelligent current limit is implemented with forced off-time, which is inversely proportional to V_OUT. This scheme ensures short-circuit control while providing minimum foldback. Other features include: thermal shutdown, V_CC undervoltage lockout, gate drive undervoltage lockout, maximum duty cycle limiter, and a pre-charge switch.

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	Type	Title		Date
*	Data sheet	LM5008A 95-V, 350-mA, Constant On-Time DC/DC Buck Switching Regulator datasheet (Rev. H)	PDF \| HTML	11 Oct 2018
	White paper	Wide VIN power management ICs simplify white paper (Rev. A)		19 Sep 2013
	EVM User's guide	AN-1925 LM5008A Evaluation Board (Rev. C)		30 Apr 2013

Design & development

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Evaluation board

LM5008AEVAL — Evaluation Board for the LM5008A Wide Vin Constant On-time Buck Switching Regulator

The LM5008AEVAL evaluation board provides the design engineer with a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 5V output over an input range of 8V to 75V. The circuit delivers load currents to 300 mA, with current (...)

User guide: PDF