LM5176 - 55V Wide VIN 4-Switch Buck-Boost Controller | TI
부품 번호: LM5176 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 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 |
LM5176 개요
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.
드롭인 대체품: LM5176 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LM5176-Q1
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM5175
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM5177
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LM5176 최대 정격 & 전기적 특성
| 기능 | Synchronous 4-switch buck-boost controller |
| 입력 전압 범위 | 4.2 V to 55 V |
| Absolute Maximum Input Voltage | 60 V |
| 출력 전압 범위 | 0.8 V to 55 V (adjustable) |
| Output Current | External MOSFETs, up to 10 A (depending on design) |
| 스위칭 주파수 | 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 |
| 패키지 | 28-pin HTSSOP (PWPR) |
| 동작 온도 범위 | -40°C to +125°C |
| RoHS 상태 | Compliant |
| MSL 레벨 | 3 (168 hours) |
| 실장 유형 | Surface Mount |
LM5176 핀 구성
| 핀 1 | VIN — Input supply voltage |
| 핀 2 | EN — Enable pin (active high) |
| 핀 3 | UVLO — Undervoltage lockout programming |
| 핀 4 | OVP — Overvoltage protection programming |
| 핀 5 | RT — Switching frequency programming |
| 핀 6 | SS — Soft-start programming |
| 핀 7 | COMP — Compensation network |
| 핀 8 | FB — Feedback input |
| 핀 9 | ISENSE — Current sense input |
| 핀 10 | VCC — Internal regulator output |
| 핀 11 | BST1 — Bootstrap for high-side driver 1 |
| 핀 12 | HDRV1 — High-side gate driver 1 |
| 핀 13 | SW1 — Switch node 1 |
| 핀 14 | LDRV1 — Low-side gate driver 1 |
| 핀 15 | PGND — Power ground |
| 핀 16 | LDRV2 — Low-side gate driver 2 |
| 핀 17 | SW2 — Switch node 2 |
| 핀 18 | HDRV2 — High-side gate driver 2 |
| 핀 19 | BST2 — Bootstrap for high-side driver 2 |
| 핀 20 | VOUT — Output voltage sense |
| 핀 21 | AGND — Analog ground |
| 핀 22 | PAD — Exposed thermal pad (solder to ground) |
일반적인 애플리케이션
LM5176 적합 용도: 6 애플리케이션s: 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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
추천 제품 요약
엔지니어링 참조 데이터: LM5176 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- Wide input voltage range (4.2V to 55V) (vs LM5175)
- Automotive grade option (LM5176-Q1) (vs LM5175)
- Programmable UVLO and OVP (vs LTC3115-1)
설계 노트
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.
규정 준수 정보
RoHS compliant per TI product page. Not AEC-Q100 qualified - choose LM5176-Q1 for automotive.
