LM5176QPWPRQ1 - 55V 4-Switch Buck-Boost Controller | TI
MPN: LM5176QPWPRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.1 | $6.10 |
| 10 | $5.52 | $55.20 |
| 25 | $5.05 | $126.25 |
| 100 | $4.35 | $435.00 |
| 250 | $3.89 | $972.50 |
| 1,000 | $3.31 | $3,310.00 |
LM5176QPWPRQ1 Overview
A buck-boost controller is a type of switching regulator that steps voltage up or down as needed. The four-switch buck-boost topology uses four external MOSFETs to transition seamlessly between buck and boost operation, making it ideal where input voltage varies above and below the output, as in automotive 12 V buses during cranking and load-dump. In the power management hierarchy: buck-boost controller -> DC-DC controller -> switching regulator -> power management IC.
Key features include current-mode control in both buck and boost modes for superior load and line regulation, integrated cycle-by-cycle current limiting, output overvoltage protection, thermal shutdown, and PWM/PFM operation for improved light-load efficiency. AEC-Q100 qualification with -40C to +125C ambient operation (junction up to +150C) targets harsh automotive environments.
Architecturally, the LM5176-Q1 drives external N-channel MOSFETs, allowing designers to scale output power freely. The proprietary current-mode scheme simplifies loop compensation and delivers fast transient response, while the four-switch topology maintains high efficiency across wide input-to-output ratios.
Typical applications include automotive USB power delivery, battery-backup and holdup power supplies, industrial 12 V/24 V bus systems, LED drivers, and renewable energy interfaces. Its transient immunity keeps output regulation during automotive input disturbances.
Design with care: keep MOSFET gate-drive loops short, place high-frequency decoupling close to the IC, and select the switching frequency to balance efficiency versus component size. Tune the compensation network for stable operation across buck, boost, and buck-boost transition regions.
Drop-in alternatives for LM5176QPWPRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LM5176QPWPRQ1 (same form factor and footprint) — differing in Package, Topology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM5176QPWPTQ1
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →LM5176QPWPR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LM5175QPWPRQ1
⚡ Same Package📋 Reference alternative (not in catalog)
LM5175PWPR
⚡ Same Package📋 Reference alternative (not in catalog)
LM5117QMHX/NOPB
⚡ Same Package ⚠️ Specs Unverified✓ In Stock
$3.72 / Unit
View Datasheet →LM5176QPWPRQ1 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous 4-Switch Buck-Boost Controller |
| Input Voltage Range | 4.2 V to 55 V |
| Absolute Maximum Input | 60 V |
| Output | Positive, regulated at/above/below VIN |
| Control Mode | Current-mode (buck and boost) |
| Switching Frequency | 100 kHz to 600 kHz (programmable) |
| Outputs | 1 |
| Light Load Mode | PWM / PFM |
| Package | 28-HTSSOP (PWP) with PowerPAD |
| Operating Temperature | -40C to +125C |
| Junction Temperature | -40C to +150C |
| Automotive Qualification | AEC-Q100 qualified |
| Protection Features | Cycle-by-cycle current limit, OVP, thermal shutdown |
| Mounting Type | Surface Mount |
| Applications Grade | Automotive (Q1) |
| RoHS Status | Compliant |
LM5176QPWPRQ1 28-htssop (pwp) with powerpad Pin Configuration Guide
Pin configuration for LM5176QPWPRQ1 (28-htssop (pwp) with powerpad package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LM5176QPWPRQ1.
Refer to the datasheet for full pin configuration.
Typical Applications
LM5176QPWPRQ1 is suitable for 6 applications: Automotive USB Power Delivery, Battery Backup and Holdup Power, Industrial 12 V / 24 V Bus Power, Automotive LED Lighting Drivers, Multi-Cell Battery Powered Systems, Test and Measurement Instrument Power.
Automotive USB Power Delivery
The LM5176QPWPRQ1 regulates a stable 5 V or 9 V USB PD rail from a 12 V automotive bus that can swing from 4.2 V during cranking to above 40 V during load-dump. Its 4.2 V to 55 V input range covers the entire automotive transient envelope without input overvoltage crowbar circuits, and current-mode control delivers fast transient response when USB devices plug in. Placing the controller between the battery node and USB port with synchronous MOSFETs achieves high efficiency, and PFM mode keeps light-load standby current low for always-on ports.
Recommended
Battery Backup and Holdup Power
In systems with a backup battery or supercapacitor, bus voltage can rise above or fall below the regulated rail. The four-switch buck-boost topology of the LM5176QPWPRQ1 charges and discharges the backup source while regulating the output at, above, or below the input, something neither buck nor boost alone can do. With 55 V maximum input and programmable 100-600 kHz switching, designers can balance efficiency and magnetic size. Cycle-by-cycle current limiting protects the MOSFETs during deep discharge charging of a depleted backup cell.
Recommended
Industrial 12 V / 24 V Bus Power
Industrial equipment commonly runs from 12 V, 24 V, or imperfect rectified supplies with wide tolerance. The LM5176QPWPRQ1 accepts 4.2 V to 55 V, covering 12 V and 24 V buses with a single design, reducing platform variants. The -40C to +125C ambient range suits factory-floor enclosures without forced cooling. External MOSFETs let engineers scale output current from a few amps to tens of amps, and the current-mode loop compensation remains stable through buck-boost mode transitions where voltage-mode schemes often struggle.
Recommended
Automotive LED Lighting Drivers
The LM5176QPWPRQ1 can regulate current into automotive LED strings where battery voltage may be below or above the required LED forward voltage. Using the FB pin with a current-sense shunt converts the buck-boost into a constant-current driver, and the 100-600 kHz frequency range allows operation above audible noise thresholds. AEC-Q100 qualification and +150C junction rating meet headlamp and daytime-running-light reliability requirements, while cycle-by-cycle current limiting protects against shorted LED strings.
Recommended
Multi-Cell Battery Powered Systems
Portable and semi-portable systems powered by multi-cell lithium or lead-acid stacks see terminal voltage swing widely with state of charge. A 4-cell lithium stack spans roughly 10.4 V to 16.8 V, crossing common 12 V rails. The LM5176QPWPRQ1 regulates through this crossover seamlessly, and its PFM mode reduces losses at light standby load, extending runtime. Designers tune the switching frequency toward 400-600 kHz to shrink inductor size, important where board area is constrained.
Recommended
Test and Measurement Instrument Power
Bench instruments and modular test systems often share a nominal supply whose actual voltage varies with load and cabling. The LM5176QPWPRQ1 provides a stiff intermediate rail independent of bus variation, protecting downstream sensitive analog stages. Current-mode control gives fast load transient response when instrument channels enable, and the wide 55 V input supports line-powered systems using off-the-shelf adapters. Layout care around gate-drive loops keeps switching noise below the analog floor of the measurement chain.
Recommended
Recommended Products Summary
Engineering reference data for LM5176QPWPRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5176QPWPTQ1 | LM5176QPWPR | LM5175QPWPRQ1 | LM5117QMHX/NOPBQ1 |
|---|---|---|---|---|---|
| Package | 28-HTSSOP (PWP) | 28-HTSSOP (PWP) - same | 28-HTSSOP (PWP) - same | 28-HTSSOP (PWP) - same package, different pinout | HTSSOP-28 (MHC) - similar outline, different pinout |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Topology | Synchronous 4-switch buck-boost | Synchronous 4-switch buck-boost | Synchronous 4-switch buck-boost | Buck-boost (single inductor, different control) | Coupled inductor buck-boost |
| Control Mode | Current-mode (buck and boost) | Current-mode (buck and boost) | Current-mode (buck and boost) | Peak current mode | Current-mode |
| AEC-Q100 | Qualified | Qualified | Not qualified (standard grade) | Qualified | Qualified |
| Drop-in Pin Compatibility | - | Yes - pin-to-pin | Yes - pin-to-pin | No - redesign required | No - redesign required |
Key Differentiators
- Automotive AEC-Q100 qualified (vs LM5176QPWPR)
- True 4-switch buck-boost through VIN = VOUT (vs LM5117QMHX/NOPBQ1)
- Seamless mode transition with one control loop architecture (vs LM5175QPWPRQ1)
Design Notes
Keep the four MOSFET gate-drive loops as short and as small as possible; route HO1/LO1 and HO2/LO2 traces directly over their return paths (SW nodes and PGND). Place the bootstrap capacitors close to the IC. Follow the PowerPAD thermal land pattern in the TI datasheet with an array of vias to the ground plane to keep junction temperature below +150C in automotive enclosures.
Select the switching frequency between 100 kHz and 600 kHz based on the trade-off between efficiency and magnetics size. For high-current automotive designs (several amps output), lower frequencies near 200-300 kHz reduce MOSFET switching losses; for compact designs, 400-600 kHz shrinks the inductor. Verify the current-sense element rating against cycle-by-cycle current limit thresholds.
The four-switch buck-boost transitions between buck, buck-boost, and boost modes near VIN = VOUT. Tune the compensation network and verify stability across the entire transition region, not only at nominal buck and boost operating points. Also verify behavior at the 4.2 V minimum input during deep cranking conditions to avoid dropout of the regulated rail.
Compliance Information
AEC-Q100 qualified per TI product page. RoHS/lead-free per distributor listings; verify REACH and halogen-free status on the TI quality portal.
