LM5176QPWPRQ1 - 55V 4-Switch Buck-Boost Controller | TI
MPN： LM5176QPWPRQ1 ✓ 啟用中LM5176QPWPRQ1 概覽
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.
直接替換替代品，適用於 LM5176QPWPRQ1 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LM5176QPWPRQ1 （相同外形與佔位） — 差異在於 Package, Topology.
LM5176QPWPTQ1
✅ 直接替換聯絡詢價
查看資料表 →LM5176QPWPR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM5175QPWPRQ1
⚡ 相同封裝📋 參考替代品（不在目錄中）
LM5175PWPR
⚡ 相同封裝📋 參考替代品（不在目錄中）
LM5117QMHX/NOPB
⚡ 相同封裝 ⚠️ 規格未經驗證✗ 缺貨
$3.72 / 單位
查看資料表 →LM5176QPWPRQ1 最大額定值與電氣特性
| 拓撲 | Synchronous 4-Switch Buck-Boost Controller |
| 輸入電壓範圍 | 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) |
| 切換頻率 | 100 kHz to 600 kHz (programmable) |
| Outputs | 1 |
| Light Load Mode | PWM / PFM |
| 封裝 | 28-HTSSOP (PWP) with PowerPAD |
| 工作溫度 | -40C to +125C |
| Junction Temperature | -40C to +150C |
| Automotive Qualification | AEC-Q100 qualified |
| Protection Features | Cycle-by-cycle current limit, OVP, thermal shutdown |
| 安裝類型 | Surface Mount |
| Applications Grade | Automotive (Q1) |
| RoHS 狀態 | Compliant |
LM5176QPWPRQ1 28-htssop (pwp) with powerpad 腳位配置指南
LM5176QPWPRQ1（28-htssop (pwp) with powerpad 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： LM5176QPWPRQ1.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM5176QPWPRQ1 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 LM5176QPWPRQ1 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Automotive AEC-Q100 qualified (對比LM5176QPWPR)
- True 4-switch buck-boost through VIN = VOUT (對比LM5117QMHX/NOPBQ1)
- Seamless mode transition with one control loop architecture (對比LM5175QPWPRQ1)
設計說明
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.
合規資訊
AEC-Q100 qualified per TI product page. RoHS/lead-free per distributor listings; verify REACH and halogen-free status on the TI quality portal.
