MIC5377YC5 - 150mA Adjustable LDO Regulator | Microchip | SC-70-5
料号： MIC5377YC5 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.5 | $0.50 |
| 10 | $0.45 | $4.50 |
| 100 | $0.38 | $38.00 |
| 500 | $0.32 | $160.00 |
| 1,000 | $0.28 | $280.00 |
| 3,000 | $0.24 | $720.00 |
MIC5377YC5 概述
An LDO (low-dropout) linear regulator is a type of linear voltage regulator that maintains a stable, low-noise output voltage even when the input voltage approaches the output voltage, with a dropout voltage typically much lower than older standard regulators. Within the broader power-management hierarchy, an LDO belongs to the family of linear regulators, which in turn are a subclass of voltage regulators, themselves part of the power-management integrated circuit (PMIC) category of semiconductors. LDOs are valued over switching regulators in applications where switching ripple and EMI must be minimized, and the small VIN-VOUT differential produces acceptable thermal dissipation.
Key features of the MIC5377YC5 include 150 mA continuous output current, low quiescent current to maximize battery life, internal soft-start circuitry, current-limit protection, and thermal-shutdown protection. The enable pin (where applicable in the MIC5376/8 family) supports an auto-discharge resistive load that pulls the output down when disabled, eliminating residual charge on downstream loads. The 5-pin SC-70 package is one of the smallest regulator footprints in the industry, ideal for hand-held, wearable, and IoT form factors where every square millimeter of PCB area is at a premium.
Technically, the MIC5377 uses a PNP pass-element architecture that delivers low dropout and fast transient response. Stability is achieved with small ceramic input and output capacitors (typically 1 µF X7R), simplifying BOM cost and PCB layout. The adjustable variant allows designers to set any output voltage within its supported range, providing flexibility across multi-rail systems.
Typical applications include portable and wearable electronics, IoT sensor nodes, wireless modules, hand-held instruments, and post-regulation stages after switching converters. When designing with this part, ensure the input voltage stays within the absolute maximum rating, use ceramic bypass capacitors close to the pins, and verify that the worst-case power dissipation (PD = (VIN - VOUT) × IOUT) stays within the SC-70 thermal envelope. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet alone.
直接替换替代料： MIC5377YC5 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MIC5376YC5-TR
✅ 直接替换📋 参考替代料（不在目录中）
MIC5375YC5-TR
✅ 直接替换📋 参考替代料（不在目录中）
MIC5378YC5-TR
✅ 直接替换📋 参考替代料（不在目录中）
MIC5377-4.2YC5-TR
✅ 直接替换📋 参考替代料（不在目录中）
MIC5377-3.3YC5-TR
✅ 直接替换📋 参考替代料（不在目录中）
ADP151ACBZ-3.3
✅ 直接替换📋 参考替代料（不在目录中）
NCP702SN28T1G
✅ 直接替换📋 参考替代料（不在目录中）
MIC5377YC5 最大额定值与电气特性
| Manufacturer | Microchip Technology |
| Part Number | MIC5377YC5 (supplied on reel as MIC5377YC5-TR) |
| Regulator Topology | Low-Dropout (LDO) Linear Regulator, Positive |
| 输出类型 | Adjustable |
| 输出数量 | 1 |
| Input Voltage Range (max) | Up to 5.5 V |
| 最大输出电流 | 150 mA |
| 封装 | 5-pin SC-70 (C5 marking suffix) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (per distributor listings) |
| Lead-Free Status | Lead Free (per DigChip listing) |
| Reel Quantity | 3000 (TR suffix, per distributor standard) |
MIC5377YC5 引脚配置
| 引脚 1 | VIN — Input supply voltage |
| 引脚 2 | GND — Ground |
| 引脚 3 | EN — Enable (active-high; tied to VIN if not used) |
| 引脚 4 | ADJ — Adjust (feedback for external resistor divider) |
| 引脚 5 | VOUT — Regulated output voltage |
典型应用
MIC5377YC5 适用于 7 应用s: Wearable and Hand-Held Electronics, IoT Sensor Nodes and Wireless Modules, Post-Regulation After Switching Converters, Battery-Powered Portable Instruments, Low-Dropout Reference for ADCs and DACs, Industrial Sensor Signal Conditioning, LED Indicator and Bias Supply.
Wearable and Hand-Held Electronics
The MIC5377YC5's 150 mA output, low quiescent current, and ultra-compact SC-70-5 footprint make it a strong fit for wearable and hand-held devices such as fitness bands, smart watches, and BLE beacons. The 5.5 V input tolerance covers single-cell Li-ion charging peaks (4.2 V max) plus headroom, while the 1 µF ceramic-cap stability requirement minimizes BOM area on dense flex/rigid PCBs. Compared to a switching converter, the LDO adds no switching noise and EMI that could disturb RF or sensor channels, at the cost of (VIN-VOUT) × IOUT dissipation. Designers typically place this LDO as the final stage after a buck converter to clean up ripple for analog or RF rails.
推荐
IoT Sensor Nodes and Wireless Modules
For IoT sensor nodes and wireless modules (Wi-Fi, BLE, Zigbee, LoRa), the MIC5377YC5 provides a clean post-regulation stage that strips switching ripple from a primary buck or battery rail before feeding sensitive RF transceivers and ADCs. Its low quiescent current extends battery life across long sleep cycles, and the SC-70-5 footprint fits inside the tight module area of modules like ESP32 or nRF52 carrier boards. A typical use is placing the LDO between a 3.7 V Li-ion cell and the 3.3 V or 1.8 V RF rail, with 1 µF X7R ceramic caps on both pins for transient response. Trade-off versus a dedicated PMIC: lower quiescent current helps sleep current, but it cannot sequence multiple rails.
推荐
Post-Regulation After Switching Converters
Use the MIC5377YC5 as a post-regulation stage downstream of a switching buck or boost converter when a downstream load (analog, RF, sensor) requires ultra-low ripple and noise. The LDO's high PSRR at low frequencies attenuates the residual switching ripple from the upstream stage, while the small SC-70-5 package can be placed near the load pin with minimal trace length. A typical application drops a 5 V switching rail down to 3.3 V or 2.8 V for an MCU or RF SoC, with the LDO absorbing the residual 50-500 kHz switching noise. The cost is the (VIN-VOUT) × IOUT linear dissipation, which at 1.7 V drop and 150 mA is 255 mW - usually fine for SC-70-5 in still air on moderate copper.
推荐
Battery-Powered Portable Instruments
The MIC5377YC5 supports battery-powered portable instruments such as digital multimeters, hand-held oscilloscopes, and medical point-of-care devices where small size, low quiescent current, and clean power are critical. Its 5.5 V absolute maximum accepts 2-3 AA alkaline cells in series or a single Li-ion cell without surge damage, and the 150 mA rating powers analog front-ends, small LCDs, and MCUs simultaneously. Compared to a switching regulator, the LDO produces no audible noise that could interfere with sensitive analog measurements or microphone inputs. Designers should validate quiescent current under deep-sleep conditions against battery shelf-life targets, since even tens of microamps matter over years of standby.
推荐
Low-Dropout Reference for ADCs and DACs
The MIC5377YC5 can serve as a low-noise, low-dropout reference rail for precision ADCs and DACs in measurement and audio applications where clean power directly impacts converter performance. The LDO's high PSRR at low frequencies removes supply-borne noise that would otherwise couple into the analog input or degrade converter SNR. A typical use is placing the LDO between a 5 V switching pre-regulator and a 4.096 V reference or 3.3 V analog supply for a 16-24 bit ADC. Designers should pair the LDO with 1 µF X7R ceramics and verify line/load regulation against the converter's PSR specification at the frequency of interest.
推荐
Industrial Sensor Signal Conditioning
In industrial sensor signal conditioning boards, the MIC5377YC5 powers low-power analog signal chains such as 4-20 mA loop interfaces, RTD/thermocouple amplifiers, and bridge-sensor front-ends. Its wide 5.5 V input tolerance accepts 24 V industrial bus rails after a pre-regulator steps down to 5 V, and the SC-70-5 footprint fits dense multi-channel boards. The low quiescent current supports always-on sensors that draw microamps in standby, while 150 mA peak covers calibration bursts and loop excitation. Designers should verify operating temperature range and add TVS protection on the input for IEC 61000-4-2/4 surge compliance in factory environments.
推荐
LED Indicator and Bias Supply
The MIC5377YC5 can power small LED indicators, status LEDs, and laser-diode bias networks where low noise and stable current are important. Its 150 mA output handles multi-LED arrays or small laser diode bias currents, and the LDO's lack of switching noise prevents audible or visible interference in optical sensor applications. A typical circuit drops a 5 V rail to a 3.3 V LED supply through a series resistor, with the LDO cleaning the supply and improving LED brightness consistency. Compared to a simple resistor divider, the LDO maintains stable LED brightness across battery discharge curves, which is critical for calibrated optical equipment.
推荐
推荐产品汇总
工程参考数据： MIC5377YC5 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MIC5376YC5-TR | MIC5375YC5-TR | MIC5378YC5-TR | ADP151ACBZ-3.3 | NCP702SN28T1G |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Analog Devices | onsemi |
| Package | SC-70-5 (YC5) | SC-70-5 - same | SC-70-5 - same | SC-70-5 - same | SC-70-5 - same | SC-70-5 - same |
| Output Type | Adjustable | Fixed (factory preset) | Fixed (factory preset) | Fixed (factory preset) | Fixed (3.3 V) | Fixed (2.8 V) |
| Output Current (max) | 150 mA | 150 mA - same | 150 mA - same | 150 mA - same | 200 mA (+33%) | 200 mA (+33%) |
| Input Voltage (max) | 5.5 V | 5.5 V - same | 5.5 V - same | 5.5 V - same | 5.5 V - same | 5.5 V - same |
| Auto-Discharge on Disable | No (adjustable variant) | Yes | No | Yes | No | No |
| External Resistor Divider Required | Yes | No | No | No | No | No |
| Approx. Unit Price @ 1k (USD) | 0.28 | 0.28 | 0.28 | 0.30 | 0.65 | 0.55 |
| RoHS Compliant | Yes | Yes | Yes | Yes | Yes | Yes |
关键差异点
- Adjustable output for flexible platform designs （对比 MIC5376YC5-TR)
- Lower unit cost versus premium cross-brand LDOs （对比 ADP151ACBZ-3.3 (Analog Devices))
- Same-package Microchip family compatibility （对比 MIC5378YC5-TR)
设计说明
Calculate worst-case power dissipation: PD_max = (VIN_max - VOUT_min) × IOUT_max. At VIN=5.5 V, VOUT=1.8 V, IOUT=150 mA, PD_max = 555 mW. Estimated: with the SC-70-5 theta_JA of approximately 330 °C/W (per JEDEC EIA/JESD51-3 still-air test board), the junction temperature rise above 25 °C ambient would be ~183 °C, exceeding the 150 °C thermal-shutdown limit. Either derate IOUT, lower VIN, or add a copper pour on the PCB to expand the thermal budget before relying on the part in this configuration.
Place the 1 µF X7R ceramic input and output capacitors as close as physically possible to the VIN and VOUT pins respectively. Keep the ground return path short and direct to the GND pin. Use a continuous ground plane beneath the LDO to spread heat and reduce EMI. For the adjustable MIC5377YC5, route the ADJ feedback trace away from noisy digital lines and keep the resistor divider close to the ADJ pin to minimize parasitic pickup that could inject noise into the regulation loop.
Common pitfalls: (1) Using electrolytic or tantalum output capacitors - the LDO requires ceramic for stability per the datasheet. (2) Exceeding the 5.5 V absolute maximum on VIN during load-dump or hot-plug events. (3) Forgetting to populate the ADJ resistor divider when migrating from a fixed-output variant - this will leave VOUT undefined or at 0 V. (4) Drawing 150 mA continuously in a sealed enclosure with no copper pour - the SC-70-5 will trigger thermal shutdown. Always validate with a thermal probe in the actual assembly, not just the schematic.
合规信息
RoHS compliant and lead-free confirmed per DigChip and distributor listings. AEC-Q100 qualification status not listed in available data - assume not qualified for automotive unless verified on the Microchip product page. REACH, halogen-free, and conflict-minerals status not confirmed in available data.
