LM5176 - 55V Wide VIN 4-Switch Buck-Boost Controller | TI
MPN: LM5176 ✓ NakahandaLM5176 Ulas
A buck-boost controller is a type of switching regulator that can step up or step down an input voltage to produce a regulated output. Unlike a buck or boost converter alone, a four-switch buck-boost topology uses four switches (two high-side and two low-side) to achieve seamless transition between buck and boost modes, maintaining regulation across a wide input range. This makes it ideal for battery-powered systems where the input voltage can vary above and below the desired output.
Key features of the LM5176 include a wide input voltage range, integrated high-side and low-side drivers, programmable switching frequency, and comprehensive protection features such as overvoltage protection (OVP) and undervoltage lockout (UVLO). The device also supports constant current regulation with an external sense resistor, enabling applications like LED drivers and battery chargers.
The LM5176 uses a current-mode control architecture with a precision reference, providing excellent line and load regulation. The integrated VCC regulator powers the internal bias rails and gate drivers, simplifying the design. The device is available in a 28-pin HTSSOP package (PWPR), which offers good thermal performance for high-power applications.
Typical applications include USB Power Delivery (PD) adapters, automotive infotainment systems, industrial power supplies, and battery-powered equipment. The wide input range and high efficiency make it a versatile choice for designs requiring a regulated output from varying input sources.
When designing with the LM5176, ensure proper PCB layout with adequate copper area for thermal dissipation, and place the input and output capacitors close to the IC. The switching frequency can be programmed with an external resistor, allowing optimization between efficiency and component size.
Mga alternatibo na pwedeng ilagay na LM5176 — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
LM5176-Q1
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
LM5175
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
LM5177
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
LM5176 Mga Pinakamataas na Rating at Electrical Characteristics
| Fungsi | Synchronous 4-switch buck-boost controller |
| Hanay ng Voltage ng Input | 4.2 V to 55 V |
| Absolute Maximum Input Voltage | 60 V |
| Hanay ng Output Volte | 0.8 V to 55 V (adjustable) |
| Output Current | External MOSFETs, up to 10 A (depending on design) |
| Takbo ng Pagpipili | 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 |
| Packhaging | 28-pin HTSSOP (PWPR) |
| Hanay ng Temperature na Operasyon | -40°C to +125°C |
| Tindminan RoHS | Compliant |
| Level ng MSL | 3 (168 hours) |
| Uri ng Pagpapasok | Surface Mount |
Pin Configuration ng LM5176
| 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) |
Tipikal na mga Gamit
LM5176 ay nararapat para sa 6 aplikasyons: 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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for LM5176 — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | 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 |
Pangunahing mga Pagkakaiba
- Wide input voltage range (4.2V to 55V) (kumpara saLM5175)
- Automotive grade option (LM5176-Q1) (kumpara saLM5175)
- Programmable UVLO and OVP (kumpara saLTC3115-1)
Talaan ng Disenyo
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.
Impormasyon ng Pagsunod sa Kautusan
RoHS compliant per TI product page. Not AEC-Q100 qualified - choose LM5176-Q1 for automotive.
