MCP1755ST-5002E/DB - 300mA, 16V LDO Regulator | Microchip | 5V Fixed
MPN: MCP1755ST-5002E/DB ✓ NakahandaMCP1755ST-5002E/DB Ulas
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. In the broader system hierarchy, LDOs belong to linear regulators, then to voltage regulators, then to power management ICs, and ultimately to the semiconductor device family. LDOs are preferred over switching regulators in noise-sensitive analog circuits because they introduce no switching ripple.
Key features of the MCP1755ST-5002E/DB include a 5V fixed output with ±2% accuracy, low quiescent current for battery-friendly operation, an active-high shutdown pin (the "S" in the part number indicates the shutdown feature), and current foldback protection that reduces power dissipation during short-circuit events. The SOT-223-3 package with its thermal tab enables continuous 300mA output with reasonable PCB copper area.
The MCP1755S architecture uses a CMOS process with a precision bandgap reference and a low-resistance P-channel pass element, achieving low dropout and high ripple rejection. The high PSRR minimizes ripple from upstream switching converters, making it suitable for AC-adapter-powered and post-regulation applications where clean rails are required.
Typical applications include USB-powered devices, microcontroller power rails, sensor conditioning modules, battery chargers, AC adapter post-regulation, and battery-powered portable electronics where low quiescent current is critical.
When designing with this device, ensure the input voltage stays within the 3.6V-16V continuous operating range and never exceeds the 18V absolute maximum. Use a 1uF ceramic input capacitor and a 1uF ceramic output capacitor close to the IC pins for stable operation. The exposed thermal tab must be soldered to a PCB copper pour to achieve rated output current.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Mga alternatibo na pwedeng ilagay na MCP1755ST-5002E/DB — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok MCP1755ST-5002E/DB (parehas na form factor at footprint) — pagkakaiba sa Maximum Output Current, Package.
MCP1755ST-3302E/DB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MCP1755ST-1802E/DB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MCP1755ST-2502E/DB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MCP1755S-5002E/DB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
LM1117MP-5.0/NOPB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AZ1117H-5.0TRE1
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MCP1755ST-5002E/DB Mga Pinakamataas na Rating at Electrical Characteristics
| Type ng Output | Fixed |
| Output Volte | 5 V |
| Output Voltage Accuracy | ±2% |
| Maksimum na Current ng Output | 300 mA |
| Input Voltage Range (Continuous) | 3.6 V to 16 V |
| Input Voltage Absolute Maximum | 18 V |
| PSRR | 70 dB at 1 kHz (typical) |
| Shutdown Pin | Yes (active-high, "S" variant) |
| Short-Circuit Protection | Current foldback |
| Hanay ng Temperature na Operasyon | -40C to +150C (Automotive Grade E) |
| Packhaging | SOT-223-3 (TO-261-4 / TO-261AA) |
| Uri ng Pagpapasok | Surface Mount |
| Level ng MSL | 1 (per JEDEC J-STD-020) |
| Tindminan RoHS | Compliant |
| AEC-Q100 Qualification | Automotive Grade (E suffix) |
Pin Configuration ng MCP1755ST-5002E/DB
| Pin 1 | VIN — Input voltage supply (3.6V to 16V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | SHDN — Active-high shutdown input |
| Pin 4 | TAB/GND — Thermal tab / Ground (must be soldered to PCB copper) |
Tipikal na mga Gamit
MCP1755ST-5002E/DB ay nararapat para sa 6 aplikasyons: 12V Industrial Sensor Power Rail, AC Adapter Post-Regulation, USB-Powered Device Power Management, Automotive 12V Accessory Rails, Battery-Powered IoT Sensor Nodes, Microcontroller Core / Peripheral Power.
12V Industrial Sensor Power Rail
The MCP1755ST-5002E/DB is ideal for deriving a clean 5V rail from a 12V industrial bus to power analog and digital sensors. Its 16V continuous input tolerance handles 12V ±10% with margin, while 70 dB PSRR at 1 kHz filters switching noise from upstream DC-DC converters. The 300mA output easily supports multi-sensor analog front-ends, and the SOT-223-3 thermal tab dissipates up to ~1W of losses at typical VIN-VOUT differentials. AEC-Q100 Grade E qualification supports factory-floor temperature ranges (-40C to +150C).
Inirekomenda
AC Adapter Post-Regulation
After a switching AC-DC converter produces an intermediate rail (e.g., 12V from a 24V adapter), the MCP1755ST-5002E/DB serves as a clean post-regulator to deliver 5V to downstream analog circuits. The high 70 dB PSRR at 1 kHz attenuates switching ripple from the upstream converter, while the LDO adds no additional switching noise. This makes it ideal for audio DACs, precision ADCs, and microcontroller cores that demand low-noise rails.
Inirekomenda
USB-Powered Device Power Management
When USB VBUS (5V ±5%) is the only input, the MCP1755ST-5002E/DB can post-regulate to a clean 5V rail for downstream analog circuitry or charge controllers. Although USB itself is 5V, regulated output improves ripple/noise for RF or ADC subsystems. With its low quiescent current, the LDO minimizes standby drain in USB suspend states, making it suitable for battery-backed USB devices. The shutdown pin supports suspend-mode power-down.
Inirekomenda
Automotive 12V Accessory Rails
Automotive 12V battery rails (with load-dump transients up to ~40V) require careful input protection, but the MCP1755ST-5002E/DB's 18V absolute maximum handles the 12V ±20% steady-state range directly. Its AEC-Q100 Grade E qualification makes it suitable for non-safety automotive applications like infotainment accessories, interior lighting controllers, and HVAC actuators. The 300mA output easily powers sensor clusters and small motor driver pre-regulators.
Inirekomenda
Battery-Powered IoT Sensor Nodes
For IoT sensor nodes running from a 9V battery or DC wall adapter, the MCP1755ST-5002E/DB provides a regulated 5V rail for low-power microcontrollers and sensors. The shutdown pin allows the host MCU to disable the LDO during deep sleep, reducing quiescent draw to near-zero. The SOT-223-3 package with thermal tab supports the 300mA peak load of radio transmission bursts while remaining cool in idle conditions.
Inirekomenda
Microcontroller Core / Peripheral Power
The MCP1755ST-5002E/DB delivers clean 5V for powering 5V-tolerant microcontroller cores, peripherals, and logic families. With 70 dB PSRR and ±2% output accuracy, it supports precise ADC reference rails and analog peripherals. The 300mA capability handles multiple peripherals simultaneously, while the SOT-223-3 footprint fits standard TO-223 land patterns commonly used on microcontroller development boards.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for MCP1755ST-5002E/DB — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | MCP1755ST-3302E/DB | MCP1755ST-1802E/DB | MCP1755S-5002E/DB | LM1117MP-5.0/NOPB | AZ1117H-5.0TRE1 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Texas Instruments | Diodes Incorporated |
| Package | SOT-223-3 | SOT-223-3 (same) | SOT-223-3 (same) | SOT-223-3 (same) | SOT-223-3 (same) | SOT-223-3 (same) |
| Output Voltage | 5.0 V | 3.3 V | 1.8 V | 5.0 V | 5.0 V | 5.0 V |
| Maximum Output Current | 300 mA | 300 mA | 300 mA | 300 mA | 800 mA | 1000 mA |
| Input Voltage Range (max) | 16 V continuous / 18 V abs | 16 V / 18 V abs (same) | 16 V / 18 V abs (same) | 16 V / 18 V abs (same) | 15 V | 15 V |
| Shutdown Pin | Yes (active-high) | Yes (active-high) | Yes (active-high) | No (always-on) | No | No |
| AEC-Q100 Grade | Grade E (-40C to +150C) | Grade E | Grade E | Grade E | Not automotive qualified | Not automotive qualified |
Pangunahing mga Pagkakaiba
- Active-high shutdown pin for power sequencing (kumpara saMCP1755S-5002E/DB)
- 16V continuous input tolerance (kumpara saLM1117MP-5.0/NOPB)
- AEC-Q100 Grade E automotive qualification (kumpara saLM1117MP-5.0/NOPB)
Talaan ng Disenyo
The SOT-223-3 package relies on its thermal tab for heat dissipation. For continuous 300mA output at VIN=12V, VOUT=5V, the estimated power dissipation is 7V × 0.3A = 2.1W. Solder the thermal tab to a PCB copper pour of at least 1 square inch (645 mm²) to keep the junction temperature within safe limits. Without adequate copper, thermal shutdown may trigger under sustained load.
Place the input and output ceramic capacitors as close as possible to the IC pins. Use a minimum of 1µF X7R ceramic on both VIN and VOUT for stable regulation per the Microchip datasheet. Keep the ground return paths short and direct, and connect the thermal tab to the same ground plane as the GND pin to minimize ground bounce and improve thermal performance.
Do not exceed the 18V absolute maximum input voltage; even brief transients above this rating can permanently damage the device. For 12V automotive applications, add a TVS diode (e.g., SMAJ16A) upstream to clamp load-dump transients. The shutdown pin must be tied to VIN through a pull-up resistor if the SHDN feature is unused, or left floating only if the IC variant supports always-on operation. Verify the exact pinout matches your PCB land pattern before assembly.
Impormasyon ng Pagsunod sa Kautusan
RoHS compliant per Microchip product page. AEC-Q100 Grade E qualified (E suffix denotes automotive grade). Lead-free and halogen-free per Microchip environmental compliance documentation.
