Texas Instruments

LM5176 - 55V Wide VIN 4-Switch Buck-Boost Controller | TI

Name: LM5176
Brand: Texas Instruments
Price: 2.88 USD
Availability: InStock

MPN: LM5176 ✓ Active

In Stock Ships in 1-3 business days

4.2 V to 55 V Vdss External MOSFETs, up to 10 A (depending on design) Id 28-pin HTSSOP (PWPR) Package 100 kHz to 600 kHz (programmable) Speed

From $2.88 USD / Unit

MOQ: 1 |

Price updated: 2026-08-26

Volume Pricing

Qty	Unit Price	Extended
1	$4.5	$4.50
10	$4.05	$40.50
100	$3.6	$360.00
500	$3.24	$1,620.00
1,000	$2.88	$2,880.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for LM5176 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

LM5176-Q1

✅ Drop-In

📦 28-HTSSOP (PWPR)

AEC-Q100 automotive grade, same pinout and package

📋 Reference alternative (not in catalog)

LM5175

✅ Drop-In

📦 28-HTSSOP (PWPR)

Lower input voltage range (4.5V to 42V), same package and pinout

📋 Reference alternative (not in catalog)

LM5177

✅ Drop-In

📦 28-HTSSOP (PWPR)

Higher input voltage (up to 70V), additional features like spread spectrum

📋 Reference alternative (not in catalog)

ℹ️ 3 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

LM5176 Maximum Ratings & Electrical Characteristics

Function	Synchronous 4-switch buck-boost controller
Input Voltage Range	4.2 V to 55 V
Absolute Maximum Input Voltage	60 V
Output Voltage Range	0.8 V to 55 V (adjustable)
Output Current	External MOSFETs, up to 10 A (depending on design)
Switching Frequency	100 kHz to 600 kHz (programmable)
Control Architecture	Current-mode control
Integrated Drivers	4 N-channel MOSFET drivers (2 high-side, 2 low-side)
VCC Regulator	Internal, powered from VIN or output
Protection Features	OVP, UVLO, thermal shutdown, cycle-by-cycle current limit
Package	28-pin HTSSOP (PWPR)
Operating Temperature Range	-40°C to +125°C
RoHS Status	Compliant
MSL Level	3 (168 hours)
Mounting Type	Surface Mount

LM5176 Pin Configuration

Pin 1	VIN — Input supply voltage
Pin 2	EN — Enable pin (active high)
Pin 3	UVLO — Undervoltage lockout programming
Pin 4	OVP — Overvoltage protection programming
Pin 5	RT — Switching frequency programming
Pin 6	SS — Soft-start programming
Pin 7	COMP — Compensation network
Pin 8	FB — Feedback input
Pin 9	ISENSE — Current sense input
Pin 10	VCC — Internal regulator output
Pin 11	BST1 — Bootstrap for high-side driver 1
Pin 12	HDRV1 — High-side gate driver 1
Pin 13	SW1 — Switch node 1
Pin 14	LDRV1 — Low-side gate driver 1
Pin 15	PGND — Power ground
Pin 16	LDRV2 — Low-side gate driver 2
Pin 17	SW2 — Switch node 2
Pin 18	HDRV2 — High-side gate driver 2
Pin 19	BST2 — Bootstrap for high-side driver 2
Pin 20	VOUT — Output voltage sense
Pin 21	AGND — Analog ground
Pin 22	PAD — Exposed thermal pad (solder to ground)

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

LM5176 is suitable for 6 applications: USB Power Delivery (PD) Adapters, Automotive Infotainment Systems, Industrial Power Supplies, Battery-Powered Equipment, LED Lighting Drivers, Test and Measurement Equipment.

⚡

USB Power Delivery (PD) Adapters

The LM5176 is ideal for USB PD adapters that need to regulate output from 5V to 20V while accepting input from 4.2V to 55V. Its wide input range and high efficiency (up to 95%) make it suitable for 65W and 100W chargers. The integrated drivers reduce external component count, and the programmable frequency allows optimization for size and efficiency. In a typical design, the LM5176 operates in buck mode when input is above output and boost mode when input is below, ensuring seamless regulation across the entire USB PD voltage range.

Recommended

🚗

Automotive Infotainment Systems

In automotive infotainment, the LM5176 regulates power from a 12V or 24V battery bus to multiple voltage rails (e.g., 5V, 3.3V) for processors, displays, and audio amplifiers. Its wide input range handles cold-crank and load-dump conditions, and the LM5176-Q1 variant is AEC-Q100 qualified for harsh environments. The controller's high efficiency reduces heat dissipation in the cabin, and its programmable UVLO ensures proper operation during battery voltage dips. The integrated drivers simplify the design of high-current rails up to 10A.

Recommended

LM5176-Q1 (Automotive grade version of LM5176) TPS62150A-Q1 · Texas Instruments

🏭

Industrial Power Supplies

The LM5176 is used in industrial power supplies that require a regulated output from a wide input range, such as 9V to 50V. The PMP21278 reference design demonstrates a 300W power supply using the LM5176 for industrial applications. Its current-mode control provides excellent line and load regulation, and the programmable frequency allows synchronization to avoid interference. The integrated OVP and UVLO protect the system from fault conditions, making it reliable for factory automation and process control equipment.

Recommended

TPS54620 · Texas Instruments LM5117PMH/NOPB · Texas Instruments

🔋

Battery-Powered Equipment

For battery-powered devices, the LM5176 maintains a regulated output as the battery voltage discharges from above to below the desired output. For example, a 12V output can be maintained from a 4-cell Li-ion battery (14.4V to 10V). The wide input range and high efficiency extend battery life, and the low quiescent current in shutdown mode helps meet standby power requirements. The controller supports constant current mode for battery charging applications, making it versatile for portable tools and medical devices.

Recommended

BQ76952 · Texas Instruments TPS62130RGTR · Texas Instruments

💡

LED Lighting Drivers

The LM5176 can be configured as a constant current LED driver by using an external sense resistor. Its wide input range (4.2V to 55V) supports various LED string voltages, and the high efficiency reduces thermal stress on the LEDs. The programmable switching frequency allows optimization for EMI and inductor size. The integrated OVP protects the LEDs from overvoltage, and the PWM dimming capability can be implemented via the EN pin or by modulating the feedback reference.

Recommended

TPS92691 · Texas Instruments LM3444 · Texas Instruments

🔧

Test and Measurement Equipment

In test and measurement instruments, the LM5176 provides a clean, regulated power supply from a wide input range, ensuring accurate measurements. Its low output ripple and high PSRR are critical for sensitive analog circuits. The programmable frequency allows synchronization with other system clocks to minimize interference. The integrated protection features ensure reliable operation in benchtop and portable instruments, and the small HTSSOP package saves board space.

Recommended

TPS54620 · Texas Instruments TPS62130RGTR · Texas Instruments

Recommended Products Summary

TPS54620 Texas Instruments Used in: USB Power Delivery (PD) Adapters, Industrial Power Supplies, Test and Measurement Equipment TPS62150A-Q1 Texas Instruments Used in: USB Power Delivery (PD) Adapters, Automotive Infotainment Systems LM5176-Q1 Automotive grade version of LM5176 Used in: Automotive Infotainment Systems LM5117PMH/NOPB Texas Instruments Used in: Industrial Power Supplies BQ76952 Texas Instruments Used in: Battery-Powered Equipment TPS62130RGTR Texas Instruments Used in: Battery-Powered Equipment, Test and Measurement Equipment TPS92691 Texas Instruments Used in: LED Lighting Drivers LM3444 Texas Instruments Used in: LED Lighting Drivers

What is the input voltage range of the LM5176?

The LM5176 operates over an input voltage range of 4.2 V to 55 V, with an absolute maximum rating of 60 V. According to the TI datasheet, this wide range supports applications from automotive (12 V/24 V) to industrial (48 V) systems.

What is the difference between LM5176 and LM5175?

The LM5176 is a newer 4-switch buck-boost controller with a wider input voltage range (4.2 V to 55 V) compared to the LM5175 (4.5 V to 42 V). The LM5176 also integrates more features like programmable UVLO and OVP, while the LM5175 is a lower-cost option for lower voltage applications.

Can the LM5176 be used for USB Power Delivery (PD) applications?

Yes, the LM5176 is well-suited for USB PD adapters due to its wide input range and ability to regulate output from 5 V to 20 V. Its high efficiency and integrated drivers make it a popular choice for 65 W and 100 W USB PD chargers.

What is the maximum output current of the LM5176?

The LM5176 is a controller, so the output current depends on the external MOSFETs and inductor. With appropriate components, it can support output currents up to 10 A or more. The datasheet provides design examples for various current levels.

Does the LM5176 have overvoltage protection?

Yes, the LM5176 includes fully configurable overvoltage protection (OVP) and undervoltage lockout (UVLO) via resistor dividers connected to dedicated pins. This allows designers to set precise thresholds for their application.

What is the switching frequency range of the LM5176?

The LM5176 switching frequency is programmable from 100 kHz to 600 kHz using an external resistor. This flexibility allows designers to optimize between efficiency and component size.

Is the LM5176 suitable for automotive applications?

Yes, the LM5176 is widely used in automotive applications such as infotainment systems and LED lighting. For AEC-Q100 qualified versions, consider the LM5176-Q1 variant, which is specifically designed for automotive environments.

What is the best drop-in replacement for the LM5176?

The LM5176-Q1 is a drop-in replacement with the same package and pinout, but it is AEC-Q100 qualified for automotive use. The LM5175 is also pin-compatible but has a lower input voltage range (42 V max), so verify your requirements before substituting.

Where can I download the LM5176 datasheet PDF?

The LM5176 datasheet PDF is available on the Texas Instruments website at https://www.ti.com/lit/ds/symlink/lm5176.pdf. It contains 45 pages of detailed specifications, application circuits, and design guidelines.

What is the price of the LM5176?

As of 2026-08-27, the LM5176PWPR is priced at approximately $4.50 for single-unit quantities, with volume pricing dropping to around $2.88 at 1000 units. Prices may vary by distributor and availability.

Can the LM5176 be used for constant current LED drivers?

Yes, the LM5176 can be configured for constant current operation by using an external sense resistor and feeding the voltage to the FB pin. This makes it suitable for high-power LED drivers requiring a wide input range.

What are the key specifications of the LM5176 that engineers should know?

The LM5176 is a synchronous 4-switch buck-boost controller with an input range of 4.2 V to 55 V (60 V abs max), programmable switching frequency from 100 kHz to 600 kHz, integrated N-channel MOSFET drivers, and current-mode control. It features OVP, UVLO, and thermal shutdown, and comes in a 28-pin HTSSOP package.

Is the LM5176 the same as the LM5177?

No, the LM5177 is a newer controller with a higher input voltage range (up to 70 V) and additional features like spread spectrum. The LM5176 and LM5177 are not pin-compatible, so they are not drop-in replacements for each other.

What is the lead time for the LM5176?

Lead time for the LM5176 varies by distributor and quantity. As of 2026-08-27, DigiKey shows it as 'ships today' for in-stock items, while larger quantities may have lead times of 4-8 weeks. Check current availability on distributor websites.

Engineering reference data for LM5176 — comparison, design guidance, and compliance information.

Selection Guide

Choose the LM5176 when you need a wide input range (up to 55V) and require programmable UVLO/OVP. For automotive applications, select the LM5176-Q1 for AEC-Q100 qualification. If your input voltage is below 42V and cost is a concern, the LM5175 is a suitable alternative with the same package and pinout. For higher input voltages (up to 70V), consider the LM5177, but note it is not pin-compatible. If you prefer a fixed-frequency solution from Analog Devices, the LTC3115-1/2 or LTC3114 offer similar functionality but require a different PCB layout due to the TSSOP package. Evaluate your input range, output current, and package requirements to make the best choice.

Comparison with Alternatives

Parameter	This Product	LM5176-Q1	LM5175	LM5177	LTC3115-1	LTC3115-2	LTC3114
Package	28-HTSSOP (PWPR)	28-HTSSOP (PWPR)	28-HTSSOP (PWPR)	28-HTSSOP (PWPR)	28-TSSOP	28-TSSOP	28-TSSOP
Brand	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices	Analog Devices
Input Voltage Range	4.2V to 55V	4.2V to 55V	4.5V to 42V	4.2V to 70V	2.7V to 40V	2.7V to 40V	2.7V to 40V
Switching Frequency	100kHz to 600kHz	100kHz to 600kHz	200kHz to 600kHz	100kHz to 600kHz	1.2MHz fixed	1.2MHz fixed	1.2MHz fixed
Control Architecture	Current-mode	Current-mode	Current-mode	Current-mode	Current-mode	Current-mode	Current-mode
Integrated Drivers	4 N-channel MOSFET drivers	4 N-channel MOSFET drivers	4 N-channel MOSFET drivers	4 N-channel MOSFET drivers	4 N-channel MOSFET drivers	4 N-channel MOSFET drivers	4 N-channel MOSFET drivers
Automotive Grade	No	Yes (AEC-Q100)	No	No	No	No	No
Price (1pc)	$4.50	$5.20	$3.80	$5.00	$6.50	$6.50	$5.80

Key Differentiators

Wide input voltage range (4.2V to 55V) (vs LM5175)
Automotive grade option (LM5176-Q1) (vs LM5175)
Programmable UVLO and OVP (vs LTC3115-1)

Design Notes

For optimal performance, place the input and output capacitors as close as possible to the VIN and VOUT pins. Use a 10uF ceramic capacitor for input and output, and add a 0.1uF high-frequency bypass capacitor. The exposed thermal pad (PAD) must be soldered to a large copper area connected to PGND to ensure proper heat dissipation.

The LM5176's power dissipation is primarily in the external MOSFETs, but the controller itself can dissipate up to 1W at high switching frequencies. Ensure adequate copper area on the PCB for the HTSSOP package's thermal pad. For high-power designs (e.g., 300W), use a multi-layer PCB with thermal vias to spread heat.

Do not exceed the absolute maximum input voltage of 60V. Use appropriate UVLO and OVP resistor dividers to protect the circuit. Ensure the bootstrap capacitors (BST1, BST2) are placed close to the IC and have sufficient capacitance (typically 0.1uF) for reliable high-side gate drive. Also, avoid routing sensitive feedback traces near the switch nodes to prevent noise coupling.