Output Current (mA)

0.1

1

10

30

30

30

40

50

60

70

80

90

100

D101

SW

VOUT

ILIM

VIN

EN

HYS

GND

RT

SS

PGOOD

LM5165X

22 F

1 F

68 H

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM5165

SNVSA47A – MARCH 2016 – REVISED MARCH 2016

1

1 Features

1

•

Wide Input Voltage Range of 3 V to 65 V

•

Fixed (3.3 V, 5 V) or Adjustable Output Voltages

•

Maximum Output Current as High as 150 mA

•

10.5-µA No Load Quiescent Current

•

–40°C to 150°C Junction Temperature Range

•

Selectable PFM or COT Mode Operation

•

Switching Frequency as High as 600 kHz

•

Diode Emulation Mode and Pulse Skipping for

Ultra-High Light-Load Efficiency Performance

•

Integrated 2-

Ω PMOS Buck Switch

–

Supports 100% Duty Cycle for Low Dropout

•

Integrated 1-

Ω NMOS Synchronous Rectifier

–

Eliminates External Rectifier Diode

•

Programmable Current Limit Setpoint (4 Levels)

•

1.223-V Internal Voltage Reference

•

900-µs Internal or Programmable Soft Start

•

Monotonic Startup into Pre-Biased Output

•

No Loop Compensation or Bootstrap Components

•

Precision Enable/Input UVLO with Hysteresis

•

Open-Drain Power Good Indicator

•

Active Slew Rate Control for Low EMI

•

Thermal Shutdown Protection with Hysteresis

•

10-Lead, 3-mm x 3-mm VSON Package

2 Applications

•

4–20 mA Loop-Powered Sensors

•

Automotive and Battery-powered Equipment

•

High-voltage LDO Replacement

•

Industrial Control Systems

•

General Purpose Bias Supplies

3 Description

The LM5165 is a compact, easy-to-use, 3-V to 65-V,

efficiency over wide input voltage and load current

ranges. With integrated high-side and low-side power

MOSFETs, up to 150-mA of output current can be

delivered at fixed output voltages of 3.3 V or 5 V, or

an adjustable output. The converter is designed to

simplify implementation while providing options to

optimize the performance the target application.

Pulse Frequency Modulation (PFM) mode is selected

for optimal light-load efficiency or Constant On-Time

(COT)

control

for

nearly

constant

operating

frequency. Both control schemes do not require loop

compensation while providing excellent line and load

transient response and short PWM on-time for large

step-down conversion ratios.

The high-side p-channel MOSFET can operate at

100% duty cycle for lowest dropout voltage and does

not require a bootstrap capacitor for gate drive. Also,

the current limit setpoint is adjustable to optimize

inductor selection for a particular output current

requirement.

Selectable/adjustable

startup

timing

options include minimum delay (no soft start),

internally fixed (900 µs), and externally programmable

soft start via an external capacitor. An open-drain

PGOOD indicator can be used for sequencing and

output voltage monitoring. The LM5165 is qualified to

automotive AEC-Q100 grade 1 and is available in a

VSON-10 package with 0.5-mm pin pitch.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM5165

VSON (10)

3 mm x 3 mm

LM5165X

LM5165Y

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Typical Schematic, Fixed Output