MIC5504-1.8YM5-TR - 300mA 1.8V LDO SOT-23-5 | Microchip
料号： MIC5504-1.8YM5-TR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.28 | $0.28 |
| 10 | $0.23 | $2.30 |
| 100 | $0.19 | $19.00 |
| 500 | $0.17 | $85.00 |
| 1,000 | $0.154 | $154.00 |
MIC5504-1.8YM5-TR 概述
An LDO (low-dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only slightly above the output. Within the power management IC hierarchy, LDOs sit alongside switching regulators as the preferred choice for low-noise, low-current rails where simplicity and small size matter more than conversion efficiency.
Key features of the MIC5504 include a fixed 1.8 V output trimmed by current trimming during manufacture, 300 mA output current capability, an auto-discharge function that pulls the output low when the enable pin is low, and an internal enable pull-down that guarantees a defined disabled state when EN floats. Operation is specified from -40C to +125C.
The MIC5504 is a member of the MIC5501/2/3/4 family described in Microchip datasheet DS20006006B. Internally, each device integrates a reference voltage source, error amplifier, driver transistor, current limiter, and phase compensation, so external support circuitry reduces to input and output capacitors. The MIC5502 and MIC5504 add auto-discharge; the MIC5503 and MIC5504 add the enable pull-down. This makes the MIC5504 the most feature-complete member of the family.
Typical applications include battery-powered portable devices powered from single-cell Li-ion cells, post-regulation of 5V or 3.3V rails for MCUs, RF modules, and sensor supplies where a defined output state during shutdown is required for system sequencing.
Design consideration: keep input voltage at least 2.5V to guarantee regulation, and rely on the auto-discharge (rather than a bleed resistor) to discharge the output capacitor during shutdown, which speeds up power cycling in duty-cycled IoT nodes.
This page synthesizes distributor pricing, drop-in alternatives, pinout, and practical design notes not found in the manufacturer datasheet, with prices as of 2026-10-12.
直接替换替代料： MIC5504-1.8YM5-TR ——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：
MIC5501-1.8YM5-TR
✅ 直接替换📋 参考替代料（不在目录中）
MIC5502-1.8YM5-TR
✅ 直接替换📋 参考替代料（不在目录中）
MIC5503-1.8YM5-TR
✅ 直接替换📋 参考替代料（不在目录中）
MIC5252-1.8YM5-TR
✅ 直接替换📋 参考替代料（不在目录中）
MIC5504-1.8YM5-TR-MS
✅ 直接替换📋 参考替代料（不在目录中）
MIC5504-1.8YM5-TR 最大额定值与电气特性
| 输出类型 | Fixed positive |
| 输出电压 | 1.8 V |
| 最大输出电流 | 300 mA |
| 输入电压范围 | 2.5 V to 5.5 V |
| 输出数量 | 1 |
| 使能引脚 | Yes, with internal pull-down |
| Auto-Discharge Feature | Yes (discharges output when EN is low) |
| 封装 | SOT-23-5 (SMD) |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40C to +125C |
| Family | MIC5501/2/3/4 300 mA LDO |
| Regulator Topology | LDO linear (reference, error amplifier, driver, current limit, phase compensation) |
| Packaging | Tape & Reel (TR suffix) |
| RoHS 状态 | Compliant |
| Typical Application | Portable / battery-powered devices |
MIC5504-1.8YM5-TR 引脚配置
| 引脚 1 | IN — Regulator input supply (2.5 V to 5.5 V) |
| 引脚 2 | GND — Ground |
| 引脚 3 | EN — Enable input with internal pull-down (logic high enables) |
| 引脚 4 | NC — Not connected (per datasheet) |
| 引脚 5 | OUT — Fixed 1.8 V regulated output with auto-discharge |
典型应用
MIC5504-1.8YM5-TR 适用于 6 应用s: Single-Cell Li-ion Battery Portable Devices, Post-Regulation of 5 V and 3.3 V System Rails, IoT Sensor Nodes and Duty-Cycled Systems, MCU Core and Flash Memory Supplies, Sequencing-Critical Multi-Rail Systems, Cost-Sensitive Consumer Electronics.
Single-Cell Li-ion Battery Portable Devices
The MIC5504-1.8YM5-TR accepts a 2.5 V to 5.5 V input, spanning the full discharge window of a single Li-ion cell (3.0 V to 4.2 V), and regulates it down to a clean fixed 1.8 V rail. Per Microchip datasheet DS20006006B, the family is explicitly targeted at powering general-purpose portable devices. In this role the LDO provides ripple-free power with no switching artifacts, and the auto-discharge feature ensures the 1.8 V rail collapses quickly when the system enters shutdown, extending battery life in duty-cycled products. The trade-off versus a buck converter is efficiency: at 3.7 V input and 1.8 V output, efficiency is roughly 49%, so this part suits loads well below the 300 mA limit.
推荐
Post-Regulation of 5 V and 3.3 V System Rails
Board-level 5 V USB or 3.3 V system supplies are often too noisy for sensitive low-voltage loads. Placing the MIC5504-1.8YM5-TR after the primary rail yields a tightly regulated 1.8 V output with the LDO's inherent ripple rejection and no added switching frequency. With a 5 V input at full 300 mA load, Estimated dissipation is (5 V - 1.8 V) x 0.3 A = 0.96 W, so copper pour on the small SOT-23-5 footprint is recommended. The enable pin with internal pull-down allows the upstream controller to gate the 1.8 V rail safely; if EN wiring is left open the part stays off, preventing accidental rail-up during bring-up.
推荐
IoT Sensor Nodes and Duty-Cycled Systems
Battery IoT nodes spend most of their life asleep, cycling power to sensors and radios. The MIC5504-1.8YM5-TR suits this pattern: the EN pin gates the rail, and the auto-discharge actively pulls the 1.8 V output to ground when disabled, so sensors power-reset cleanly each cycle instead of being held up by residual capacitor charge. Because the SOT-23-5 package occupies under 10 mm2 of board area with two external capacitors, it fits dense sensor PCBs. Designers should size the output capacitor so discharge time remains short - a 1 uF output cap discharges quickly through the internal device, keeping wake latency low across millions of cycles.
推荐
MCU Core and Flash Memory Supplies
Many microcontrollers, flash memories, and small FPGAs specify a 1.8 V core or I/O supply with tight tolerance and modest current draw. The MIC5504-1.8YM5-TR delivers exactly 1.8 V (factory trimmed by current trimming per the LCSC-reported architecture) at up to 300 mA, covering typical MCU core currents with margin. As a linear regulator it introduces no switching ripple into the core rail, simplifying power-integrity signoff. A practical note: during firmware reprogramming the load can step abruptly, so a 1 uF to 2.2 uF low-ESR output capacitor plus a 1 uF input capacitor maintains transient response, as recommended in the typical application circuits of datasheet DS20006006B.
推荐
Sequencing-Critical Multi-Rail Systems
Systems with multiple rails (3.3 V, 1.8 V, 1.2 V) often require a defined power-down order. The MIC5504-1.8YM5-TR's combination of enable pin with internal pull-down and auto-discharge makes shutdown deterministic: when EN is released low, the output is actively driven to ground rather than decaying passively. This prevents back-powering of loads through I/O protection diodes - a common cause of unexplained brownouts in mixed-voltage designs. Place the MIC5504 on the rail that must drop first, drive its EN from the rail supervisor, and verify with an oscilloscope that the 1.8 V rail reaches 0 V before upstream rails begin to decay.
推荐
Cost-Sensitive Consumer Electronics
At distributor pricing from roughly $0.15 per unit (LCSC, as of 2026-10-12) and about $0.117 for the MSKSEMI equivalent MIC5504-1.8YM5-TR-MS, this LDO is economical for high-volume consumer products: toys, small appliances, chargers, and accessories. Integration of the reference, error amplifier, current limiter, and phase compensation inside the SOT-23-5 package minimizes BOM count - only input and output ceramic capacitors are required - reducing assembly cost. The 300 mA rating covers typical small-product electronics, while the -40C to +125C operating range provides margin for enclosed, warm environments without automotive-grade pricing.
推荐
推荐产品汇总
工程参考数据： MIC5504-1.8YM5-TR ——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 | MIC5501-1.8YM5-TR | MIC5502-1.8YM5-TR | MIC5503-1.8YM5-TR | MIC5504-1.8YM5-TR-MS |
|---|---|---|---|---|---|
| Package | SOT-23-5 | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | MSKSEMI |
| Output Voltage | 1.8 V fixed | 1.8 V fixed | 1.8 V fixed | 1.8 V fixed | 1.8 V fixed |
| Output Current | 300 mA | 300 mA | 300 mA | 300 mA | 300 mA |
| Auto-Discharge | Yes | No | Yes | No | Yes (functional equivalent) |
| EN Internal Pull-Down | Yes | No | No | Yes | Yes (functional equivalent) |
关键差异点
- Only family member with both auto-discharge and EN pull-down （对比 MIC5501-1.8YM5-TR)
- Lower total feature risk vs partial-feature siblings （对比 MIC5502-1.8YM5-TR)
- Full 300 mA rating versus lower-current alternatives （对比 MIC5252-1.8YM5-TR)
- Cost advantage of MSKSEMI second source （对比 MIC5504-1.8YM5-TR-MS)
设计说明
The MIC5504-1.8YM5-TR regulates down to a 2.5 V minimum input. At full 300 mA load from a 5 V rail, Estimated dissipation is (5 V - 1.8 V) x 0.3 A = 0.96 W, which on a small SOT-23-5 footprint will raise junction temperature significantly; for continuous high loads from 5 V, either reduce load current, lower VIN, or add copper area. From a Li-ion cell (3.7 V nominal) dissipation drops to roughly (3.7 V - 1.8 V) x 0.3 A = 0.57 W, still demanding attention to layout copper. Verify junction temperature against the derating curves in Microchip datasheet DS20006006B.
Place a 1 uF ceramic input capacitor within 2-3 mm of pin 1 (IN) and a 1 uF to 2.2 uF low-ESR ceramic output capacitor at pin 5 (OUT), with solid ground return via pin 2. The MIC5504 is internally compensated per the LCSC-reported architecture (reference, error amplifier, driver, current limiter, phase compensation), but capacitor ESR still affects stability - use X5R/X7R ceramics. Keep the EN trace short and, if it originates from a noisy rail, add a 100 k pulldown is unnecessary (internal pull-down exists) but a small series resistor helps isolate transients.
Do not assume a floating EN pin enables the MIC5504 - the internal pull-down holds the part disabled with the output discharged. Designers migrating from MIC5501 or MIC5502 (no pull-down) may see the supply 'mysteriously' stay off if the net is left un-driven; tie EN to VIN for always-on operation. Also, when replacing with MIC5501-1.8YM5-TR, remember the output will decay passively at shutdown because auto-discharge is absent, which can leave residual voltage on the rail for milliseconds longer.
For noise-sensitive loads such as analog front ends or RF blocks on the 1.8 V rail, the LDO's linear regulation avoids switching spurs entirely, but PSRR degrades at high frequency; adding a 100 nF capacitor directly at the load pin in addition to the 1 uF output capacitor shunts high-frequency transients. Route the 1.8 V trace away from switching-node nets and clock lines on mixed-signal boards.
合规信息
RoHS compliance stated in distributor listings (DigiKey, LCSC, FindIC). No AEC-Q100 qualification found in provided data; verify on Microchip product page for automotive use.
