LM5164

Synchronous Buck Converter

The LM5164 is a synchronous buck converter from Texas Instruments. View the full LM5164 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Official LM5164 datasheet (PDF) — the source this page was extracted from.

Manufacturer

Texas Instruments

LM5164 Key Specifications

Parameter	Value
Output Current	1A
Switching Frequency	Up to 1MHz
Function	Step-Down
Height	1.7 mm
Length	4.89 mm
Lifecycle Status	Production (Last Updated: 1 day ago)
Manufacturer Lifecycle Status	ACTIVE (Last Updated: 1 day ago)
Max Duty Cycle	99 %
Max Junction Temperature (Tj)	150 °C
Max Operating Temperature	150 °C
Max Supply Voltage	100 V
Min Operating Temperature	-40 °C
Min Supply Voltage	6 V
Mounting Type	Surface Mount
Nominal Supply Current	600 µA
Number of Channels	1
Number of Outputs	1
Number of Outputs	1
Number of Pins	8
Operating Temperature	-40°C ~ 150°C (TJ)
Output Configuration	Positive
Output Current	1 A
Output Type	Adjustable
Package / Case	8-PowerSOIC (0.154", 3.90mm Width)
RoHS	Compliant
Schedule B	8542390000
Supplier Device Package	8-SO PowerPad
Switching Frequency	1 MHz
Synchronous Rectifier	Yes
Thickness	1.48 mm
Topology	Buck
Topology	Buck
Input Voltage (Max)	100V
Input Voltage (Min)	6V
Output Voltage (Max)	100V
Output Voltage	1.2V
Width	3.9 mm

LM5164 Overview

Part: LM5164 (LM5164DDAR) — Texas Instruments

Type: Synchronous Buck DC/DC Converter (COT control)

Description: 6–100 V input, 1 A synchronous buck converter with integrated 0.725 Ω high-side and 0.34 Ω low-side FETs, 10.5 μA no-load quiescent current and 50 ns minimum on/off times.

Operating Conditions:

Supply voltage (VIN): 6–100 V
Operating junction temperature: -40 to +150 °C
Load current: up to 1.25 A (1 A nominal)
Switching frequency: up to 1000 kHz; programmable on-time 50–10000 ns

Absolute Maximum Ratings:

Max supply voltage: VIN to GND 100 V (EN to GND 100 V)
Max junction temperature: 150 °C
Storage temperature: -65 to 150 °C

Key Specs:

Shutdown current (VEN = 0 V): 3 μA typ, 15 μA max
Sleep current (VEN = 2.5 V, VFB = 1.5 V): 10.5 μA typ, 25 μA max
Active current (VEN = 2.5 V): 600 μA typ, 880 μA max
FB regulation voltage: 1.2 V typ (1.181–1.218 V)
High-side RDSON: 0.725 Ω typ (ISW = -100 mA); low-side RDSON: 0.33 Ω typ (ISW = 100 mA)
Peak current limit: 1.5 A typ (1.25–1.75 A); valley current limit: 1.2 A typ (0.95–1.4 A)
Internal soft-start: 3 ms typ (1.75–4.75 ms)
EN rising threshold: 1.5 V typ; thermal shutdown: 175 °C typ with 10 °C hysteresis
Thermal resistance RθJA: 43.4 °C/W (DDA package)

Features:

Constant on-time (COT) control with no loop compensation components
Diode emulation for high light-load efficiency
Meets CISPR 25 class 5 EMI standard
Integrated synchronous rectifier, internal VCC bias regulator and boot diode
Peak and valley current-limit protection, input UVLO, thermal shutdown
Precision enable with programmable UVLO
Open-drain power-good indicator
Monotonic start-up into prebiased loads

Applications:

Industrial battery packs (≥ 10S)
E-bike, e-scooter, LEV battery packs
Motor drives, drones, communications equipment

Package:

DDA, 8-pin SO PowerPAD (4.9 mm × 6 mm, 1.27 mm pin pitch)

LM5164 Features

Designed for reliable and rugged applications
-Wide input voltage range of 6V to 100V
-Junction temperature range: -40°C to +150°C
-Fixed 3ms internal soft-start timer
-Peak and valley current-limit protection
-Input UVLO and thermal shutdown protection
Optimized for ultra-low EMI requirements
-Meets CISPR 25 class 5 standard
Designed for scalable Industrial power supplies and battery packs
-Low minimum on- and off-times of 50ns
-Adjustable switching frequency up to 1MHz
-Diode emulation for high light-load efficiency
-10.5μA no-load input quiescent current
-3μA shutdown quiescent current
Integration reduces design size and cost
-COT mode control architecture
-Integrated 0.725Ω NFET buck switch
-Integrated 0.34Ω NFET synchronous rectifier eliminates external Schottky diode
-1.2V internal voltage reference
-No loop compensation components
-Internal VCC bias regulator and boot diode
-Open-drain power-good indicator
-8-pin SOIC package with PowerPAD ™ integrated circuit package
Create a custom regulator design using the LM5164 with WEBENCH ® Power Designer

LM5164 Applications

Industrial battery pack (≥ 10S)
Battery pack - e-bike, e-scooter, LEV
Motor drives, drones, communications equipment

LM5164 Pin Configuration

Figure 4-1. DDA Package 8-Pin SO PowerPAD™ Integrated Circuit Package (Top View)

Table 4-1. Pin Functions

PIN - NO.	PIN - NAME	TYPE (1)	DESCRIPTION
1	GND	G	Ground connection for internal circuits
2	VIN	P/I	Regulator supply input pin to high-side power MOSFET and internal bias regulator. Connect directly to the input supply of the buck converter with short, low impedance paths.
3	EN/UVLO	I	Precision enable and undervoltage lockout (UVLO) programming pin. If the EN/UVLO voltage is below 1.1V, the converter is in shutdown mode with all functions disabled. If the UVLO voltage is greater than 1.1V and below 1.5V, the converter is in standby mode with the internal VCC regulator operational and no switching. If the EN/UVLO voltage is above 1.5V, the start-up sequence begins.
4	RON	I	On-time programming pin. A resistor between this pin and GND sets the buck switch on-time.
5	FB	I	Feedback input of voltage regulation comparator
6	PGOOD	O	Power good indicator. This pin is an open-drain output pin. Connect to a source voltage through an external pullup resistor between 10kΩ to 100kΩ.
7	BST	P/I	Bootstrap gate-drive supply. Required to connect a high-quality 2.2nF 50V X7R ceramic capacitor between BST and SW to bias the internal high-side gate driver.
8	SW	P	Switching node that is internally connected to the source of the high-side NMOS buck switch and the drain of the low-side NMOS synchronous rectifier. Connect to the switching node of the power inductor.
-	EP	-	Exposed pad of the package. No internal electrical connection. Connect the EP to the GND pin and connect to a large copper plane to reduce thermal resistance.

(1) G = Ground, I = Input, O = Output, P = Power

LM5164 Electrical Characteristics

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over the full -40°C to 150°C junction temperature range unless otherwise indicated. VIN = 24V and VEN/UVLO = 2V unless otherwise stated.

PARAMETER	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
SUPPLY CURRENT (VIN)	SUPPLY CURRENT (VIN)
I Q-SHUTDOWN	VIN shutdown current	V EN = 0V		3	15	μA
I Q-SLEEP1	VIN sleep current	V EN = 2.5V, V FB = 1.5V		10.5	25	μA
I Q-ACTIVE	VIN active current	V EN = 2.5V		600	880	μA
PRECISION ENABLE (EN/UVLO)	PRECISION ENABLE (EN/UVLO)
V SD-RISING	Shutdown threshold	V EN/UVLO rising			1.1	V
V SD-FALLING	Shutdown threshold	V EN/UVLO falling	0.45			V
V EN-RISING	Enable threshold	V EN/UVLO rising	1.45	1.5	1.55	V
V EN-FALLING	Enable threshold	V EN/UVLO falling	1.35	1.4	1.44	V
FEEDBACK VOLTAGE (FB)	FEEDBACK VOLTAGE (FB)
V REF	FB regulation voltage	V FB falling	1.181	1.2	1.218	V
TIMING (RON)	TIMING (RON)
t ON1	On-time1	V VIN = 6V, R RON = 75kΩ		5000		ns
t ON2	On-time2	V VIN = 6V, R RON = 25kΩ		1650		ns
t ON3	On-time3	V VIN = 12V, R RON = 75kΩ		2550		ns
t ON4	On-time4	V VIN = 12V, R RON = 25kΩ		830		ns
POWER GOOD MONITOR (PGOOD)	POWER GOOD MONITOR (PGOOD)
V PG-UTH	FB upper threshold for PGOOD high to low	V FB rising	1.105	1.14	1.175	V
V PG-LTH	FB lower threshold for PGOOD high to low	V FB falling	1.055	1.08	1.1	V
V PG-HYS	PGOOD upper and lower threshold hysteresis	V FB falling		60		mV
R PG	PGOOD pulldown resistance	V FB = 1V		30		Ω
BOOTSTRAP (BST)	BOOTSTRAP (BST)
V BST-UV	Gate drive UVLO	V BST rising		2.7	3.4	V
POWER SWITCHES	POWER SWITCHES
R DSON-HS	High-side MOSFET R DSON	I SW = -100mA		0.725		Ω
R DSON-LS	Low-side MOSFET R DSON	I SW = 100mA		0.33		Ω

LM5164 Absolute Maximum Ratings

Over the recommended operating junction temperature range of -40°C to +150°C (unless otherwise noted) (1)

		MIN	MAX	UNIT
Input voltage	VIN to GND	-0.3	100	V
Input voltage	EN to GND	-0.3	100	V
Input voltage	FB to GND	-0.3	5.5	V
Input voltage	RON to GND	-0.3	5.5	V
Bootstrap capacitor	External BST to SW capacitance	1.5	2.5	nF
Output voltage	BST to GND	-0.3	105.5	V
Output voltage	BST to SW	-0.3	5.5	V
Output voltage	SW to GND	-1.5	100	V
Output voltage	SW to GND (20ns transient)	-3		V
Output voltage	PGOOD to GND	-0.3	14	V
Operating junction temperature, T J	Operating junction temperature, T J	-40	150	°C
Storage temperature, T stg	Storage temperature, T stg	-65	150	°C

LM5164 Recommended Operating Conditions

Over the recommended operating junction temperature range of -40°C to +150°C (unless otherwise noted) (1)

		MIN	NOM	MAX	UNIT
V IN	Input voltage	6		100	V
V SW	Switch node voltage			100	V
V EN/UVLO	Enable voltage			100	V
I LOAD	Load current		1	1.25	A
F SW	Switching frequency			1000	kHz
C BST	External BST to SW capacitance	2.2	2.2	2.2	nF
t ON	Programmable on-time	50		10000	ns

LM5164 Thermal Information

	THERMAL METRIC (1)	LM5164 DDA (SOIC) - 8 PINS	UNIT
R θJA	Junction-to-ambient thermal resistance	43.4	°C/W
R θJC(top)	Junction-to-case (top) thermal resistance	59.5	°C/W
R θJB	Junction-to-board thermal resistance	16.1	°C/W
Ψ JT	Junction-to-top characterization parameter	4.0	°C/W
Ψ JB	Junction-to-board characterization parameter	16.3	°C/W
R θJC(bot)	Junction-to-case (bottom) thermal resistance	3.9	°C/W

LM5164 Typical Application

The LM5164 requires only a few external components to step down from a wide range of supply voltages to a fixed output voltage. Several features are integrated to meet system design requirements, including the following:

Precision enable
Input voltage UVLO
Internal soft start
Programmable switching frequency
A PGOOD indicator

To expedite and streamline the process of designing of a LM5164-based converter, a comprehensive LM5164 quickstart calculator is available for download to assist the designer with component selection for a given application. This tool is complemented by the availability of an evaluation module (EVM), numerous PSPICE models, as well as TI's WEBENCH® Power Designer.

LM5164 Package Information

PART NUMBER	PACKAGE (1)	PACKAGE SIZE (2)
LM5164	DDA (SO PowerPAD, 8)	4.9mm × 6mm

(1) For more information, see Section 10.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.

Typical Efficiency, VOUT = 12V

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
LM5164DDAR	Texas Instruments	8-PowerSOIC (0.154", 3.90mm Width)
LM5164DDAT	Texas Instruments	—

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Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.

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