LM5176QPWPRQ1 - 55V 4-Switch Buck-Boost Controller | TI
MPN: LM5176QPWPRQ1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.1 | $3,100.00 |
Drop-in alternatives for LM5176QPWPRQ1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LM5176QPWPTQ1
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View Datasheet βLM5176PWPR
β Drop-Inπ Reference alternative (not in catalog)
LM5175QPWPRQ1
β Drop-Inπ Reference alternative (not in catalog)
LM5175PWPR
β Drop-Inπ Reference alternative (not in catalog)
LTC3115-2EFE#PBF
β‘ Same Packageβ In Stock
$6.25 / Unit
View Datasheet βLM5176QPWPRQ1 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) |
| Switching Frequency | 100 kHz to 600 kHz |
| Control Method | Current-mode control |
| Number of Outputs | 1 |
| Package | 28-HTSSOP (PW) |
| Operating Temperature Range | -40Β°C to +125Β°C (ambient) |
| Junction Temperature Range | -40Β°C to +150Β°C |
| AEC-Q100 Qualified | Yes |
| RoHS Compliant | Yes |
| Mounting Type | Surface Mount |
| Number of Terminals | 28 |
| Output Type | Transistor Driver |
LM5176QPWPRQ1 Pin Configuration
| Pin 1 | VIN β Input supply voltage |
| Pin 2 | EN β Enable pin (active high) |
| Pin 3 | RT β Switching frequency timing resistor |
| Pin 4 | SS β Soft-start capacitor connection |
| Pin 5 | COMP β Error amplifier output for loop compensation |
| Pin 6 | FB β Feedback voltage sense |
| Pin 7 | VCC β Internal bias supply output |
| Pin 8 | GND β Ground |
| Pin 9 | HDRV1 β High-side gate drive for buck switch |
| Pin 10 | SW1 β Switch node for buck stage |
| Pin 11 | LDRV1 β Low-side gate drive for buck switch |
| Pin 12 | PGND β Power ground |
| Pin 13 | LDRV2 β Low-side gate drive for boost switch |
| Pin 14 | SW2 β Switch node for boost stage |
| Pin 15 | HDRV2 β High-side gate drive for boost switch |
| Pin 16 | VOUT β Output voltage sense |
| Pin 17 | ISNS β Current sense input |
| Pin 18 | AGND β Analog ground |
| Pin 19 | PGOOD β Power good indicator |
| Pin 20 | MODE β Mode selection (PWM/PFM) |
| Pin 21 | SYNC β External clock synchronization |
| Pin 22 | DITH β Spread spectrum dithering control |
| Pin 23 | UVLO β Under-voltage lockout set |
| Pin 24 | OVP β Overvoltage protection set |
| Pin 25 | ILIM β Current limit set |
| Pin 26 | VBIAS β Bias supply for gate drivers |
| Pin 27 | BST1 β Bootstrap for high-side buck driver |
| Pin 28 | BST2 β Bootstrap for high-side boost driver |
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
LM5176QPWPRQ1 is suitable for 6 applications: Automotive USB Power Delivery, Industrial Power Supplies, Battery-Powered Systems, LED Lighting, Telecom and Networking Equipment, Renewable Energy Systems.
Automotive USB Power Delivery
The LM5176QPWPRQ1's wide 4.2V to 55V input range and AEC-Q100 qualification make it ideal for automotive USB power delivery systems. It can step up or step down the vehicle battery voltage to provide a stable 5V, 9V, or 20V output for fast charging. The current-mode control ensures stable operation during load transients, and the 100kHz to 600kHz switching frequency allows optimization for efficiency and size. With integrated protection features, it meets the reliability requirements of automotive environments.
Recommended
Industrial Power Supplies
In industrial power supplies, the LM5176QPWPRQ1 provides a flexible solution for regulating output from a wide input range, such as 12V or 24V buses. Its four-switch buck-boost topology maintains regulation even when input voltage dips below the output, ensuring uninterrupted operation. The device's high switching frequency allows for smaller magnetics, reducing board space. Its robust protection features, including cycle-by-cycle current limiting and thermal shutdown, enhance system reliability in harsh industrial environments.
Recommended
Battery-Powered Systems
For battery-powered systems, the LM5176QPWPRQ1 efficiently regulates output as the battery voltage discharges from above to below the desired output level. Its wide input range supports multi-cell battery packs, and the current-mode control provides stable operation across the entire discharge curve. The device's low quiescent current in PFM mode extends battery life during light-load operation. This makes it suitable for portable equipment, drones, and other battery-operated devices requiring a regulated supply.
Recommended
LED Lighting
The LM5176QPWPRQ1 can be used in LED lighting systems to provide a constant voltage or current from a wide input range, such as automotive or industrial lighting buses. Its four-switch topology allows for efficient operation whether the input is above or below the LED string voltage. The device's high switching frequency enables small inductor and capacitor sizes, reducing the overall form factor. With AEC-Q100 qualification, it is suitable for automotive LED headlamps and daytime running lights.
Recommended
Telecom and Networking Equipment
In telecom and networking equipment, the LM5176QPWPRQ1 provides a regulated supply from a wide input range, such as 12V or 48V backplane voltages. Its buck-boost capability ensures stable output during input voltage variations, which is common in power distribution systems. The device's high efficiency reduces thermal stress, and its programmable switching frequency allows synchronization to avoid interference. This makes it suitable for routers, switches, and base stations.
Recommended
Renewable Energy Systems
The LM5176QPWPRQ1 is well-suited for renewable energy systems, such as solar panel power conditioning, where input voltage varies widely with sunlight intensity. Its four-switch buck-boost topology maintains a constant output voltage as the panel voltage fluctuates, maximizing energy harvest. The device's wide input range and high efficiency make it ideal for MPPT (Maximum Power Point Tracking) controllers. Its robust protection features ensure reliable operation in outdoor environments.
Recommended
Recommended Products Summary
Engineering reference data for LM5176QPWPRQ1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5176QPWPTQ1 | LM5176PWPR | LM5175QPWPRQ1 | LM5175PWPR | LTC3115-2EFE#PBF |
|---|---|---|---|---|---|---|
| Package | 28-HTSSOP (PW) | 28-HTSSOP (PW) | 28-HTSSOP (PW) | 28-HTSSOP (PW) | 28-HTSSOP (PW) | 28-TSSOP (FE) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Input Voltage Range | 4.2V to 55V | 4.2V to 55V | 4.2V to 55V | 4.5V to 42V | 4.5V to 42V | 2.7V to 40V |
| Switching Frequency | 100kHz to 600kHz | 100kHz to 600kHz | 100kHz to 600kHz | 100kHz to 600kHz | 100kHz to 600kHz | 1.2MHz (fixed) |
| AEC-Q100 Qualified | Yes | Yes | No | Yes | No | No |
| Control Method | Current-mode | Current-mode | Current-mode | Current-mode | Current-mode | Current-mode |
| Operating Temperature Range | -40Β°C to +125Β°C | -40Β°C to +125Β°C | -40Β°C to +125Β°C | -40Β°C to +125Β°C | -40Β°C to +125Β°C | -40Β°C to +125Β°C |
| Pin Compatibility | Reference | Pin-compatible | Pin-compatible | Pin-compatible | Pin-compatible | Not pin-compatible |
Key Differentiators
- AEC-Q100 automotive qualification (vs LM5176PWPR)
- Wider input voltage range (4.2V to 55V) (vs LM5175QPWPRQ1)
- Pin-compatible with LM5176 family (vs LTC3115-2EFE#PBF)
Design Notes
For optimal performance, place the input and output capacitors close to the MOSFETs and the LM5176QPWPRQ1. Use a low-ESR ceramic capacitor (e.g., 10uF) for high-frequency decoupling. The high-current paths (VIN, SW1, SW2, VOUT) should be short and wide to minimize parasitic inductance. Refer to the TI application note SLVA636 for layout guidelines.
The LM5176QPWPRQ1 is a controller and does not dissipate significant power itself, but the external MOSFETs do. Ensure adequate heatsinking for the power stage, especially at high output currents. The thermal pad of the HTSSOP package should be soldered to a large copper area to improve heat dissipation. Monitor the junction temperature to stay within the -40Β°C to +150Β°C range.
A common mistake is improper loop compensation, leading to instability. Use the component values recommended in the datasheet for your specific operating point. Also, ensure the bootstrap capacitors (BST1, BST2) are placed close to the IC and have sufficient capacitance to drive the high-side MOSFETs. Incorrect current sensing can cause premature current limiting; verify the ISNS resistor value.
Compliance Information
AEC-Q100 qualified per TI product page. RoHS compliant. REACH compliance assumed based on TI's global compliance policy.
