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Diodes Incorporated PAM3101DAB250
- Part No.:
- PAM3101DAB250
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
PAM3101DAB250.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,036
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Product details
Overview
PAM3101DAB250 from Diodes Incorporated is a 2.5V fixed-output, 300mA low-dropout linear regulator in DFN1.6x1.6-6L package with enable (EN) and bypass (BYP) pins. It delivers ±2% output accuracy, 180mV dropout at 300mA (VO = 3.3V), 65µA quiescent current, and 70dB PSRR at 1kHz-optimized for noise-sensitive battery-powered portable electronics.
For engineers reviewing the PAM3101DAB250 datasheet, PAM3101DAB250 pinout, PAM3101DAB250 application, or PAM3101DAB250 equivalent, key selection criteria include dropout voltage under load, EN logic polarity (active-high), BYP capacitor requirement (10nF to GND), thermal resistance (θJA = 175°C/W), and compatibility with ≥2.2µF ceramic output capacitors.
Technical Context
The PAM3101DAB250 integrates a P-channel MOSFET pass transistor (RDS(on) ≈ 0.75Ω) enabling ultra-low ground current across load conditions. Its internal feedback loop maintains regulation with 2.2µF minimum output capacitance and requires a 10nF capacitor on the BYP pin to form a 200kΩ–10nF RC filter for output noise suppression.
Enable functionality is active-high with VTH = 1.5V min and VTL = 0.3V max; shutdown current is 0.01–1µA. Thermal protection activates at TJ = +150°C with 30°C hysteresis, and current limiting caps output at ~400mA to prevent damage during overload or short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - ensures stable core/peripheral rail for 2.5V logic or analog circuitry |
| Max Output Current | 300mA - supports moderate-power RF modules, sensors, or audio codecs without external boost |
| Dropout Voltage | 180mV @ 300mA (VO ≥ 3.3V); 370mV @ 300mA (2.5V ≤ VO < 3.3V) - enables operation down to 2.87V input for 2.5V output |
| PSRR | 70dB @ 1kHz - suppresses switching noise from adjacent DC/DC converters in mixed-power systems |
| Quiescent Current | 65µA typ. - extends battery life in always-on sensor nodes or Bluetooth standby modes |
| Operating Input Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), LiFePO₄ (2.5–3.65V), or 3.3V/5V system rails |
| Thermal Resistance θJA | 175°C/W (DFN1.6x1.6) - allows ~570mW max power dissipation at TA = +25°C before thermal shutdown |
Pinout & Package
DFN1.6x1.6-6L is a 1.6mm × 1.6mm, 0.5mm pitch, thermally enhanced leadless package with exposed thermal pad (pin 6 = GND). It supports high-density PCB layouts and improved thermal performance over SOT-23/SOT-89.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; must be decoupled with ≥1µF ceramic capacitor within 0.5 inch |
| 2 | NC | No internal connection - leave unconnected or float; no electrical function |
| 3 | VIN | Secondary input connection - tied internally to Pin 1; improves current sharing and reduces IR drop |
| 4 | VOUT | Regulated 2.5V output; requires ≥2.2µF ceramic capacitor (ESR > 5mΩ) for stability |
| 5 | NC | No internal connection - leave unconnected or float; no electrical function |
| 6 | GND | Power and signal reference; connects to exposed thermal pad - must be soldered to large copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Active-High Enable with 1.5V Threshold | EN pin accepts standard 1.8V/3.3V GPIOs without level-shifting; floating default is functional (pull-high variant) |
| Bypass Pin with Integrated 200kΩ Resistor | BYP pin forms RC low-pass filter with external 10nF cap - reduces broadband output noise by ~50µVRMS (10Hz–100kHz) |
| Thermal Shutdown with 30°C Hysteresis | Shuts down at TJ = +150°C and resumes at +120°C - prevents latch-up and enables self-recovery after transient overload |
| Current Limiting & Short-Circuit Protection | Soft-limits output to ~400mA - avoids destructive current surges while maintaining regulation during partial shorts |
| Stable with Low-ESR Ceramic Capacitors | Validated for ≥2.2µF X5R/X7R ceramics - eliminates need for tantalum or aluminum electrolytics, reducing BOM cost and footprint |
Applications
| Bluetooth Audio Transmitter | Wi-Fi IoT Sensor Node |
|---|---|
|
Use Scenario: Powering a CSR8645-based Bluetooth transmitter IC and MEMS microphone in compact earbud design. IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying RF transceiver core and analog front-end; BYP pin filters switching noise from shared 3.3V buck converter. Use Value: 65µA IQ extends battery runtime beyond 8 hours; 180mV dropout enables full discharge of 3.0V Li-ion cell down to 2.68V. |
Use Scenario: Regulating power for ESP32-WROOM-32 module and BME280 environmental sensor in battery-operated smart agriculture node. IC Role / Device Role / Timing Role: Always-on 2.5V rail for RTC, wake-up comparator, and low-power sensor interface; EN pin controlled by microcontroller for deep-sleep sequencing. Use Value: 70dB PSRR isolates sensitive ADC references from Wi-Fi burst noise; DFN1.6x1.6 footprint saves >40% board area vs. SOT-23. |
| Portable Medical Pulse Oximeter | USB-Powered USB-C Accessory |
|
Use Scenario: Supplying 2.5V to MAX30101 optical sensor and low-noise op-amp signal chain in handheld SpO₂ monitor. IC Role / Device Role / Timing Role: Ultra-low-noise 2.5V bias rail; BYP+10nF reduces output ripple to <50µVRMS, critical for photodiode current measurement fidelity. Use Value: ±2% output accuracy ensures consistent LED drive current calibration; thermal shutdown protects against enclosure overheating during extended use. |
Use Scenario: Generating 2.5V auxiliary rail from USB 5V input in USB-C PD sink accessory with integrated display and touch controller. IC Role / Device Role / Timing Role: Secondary LDO for display driver IC requiring clean 2.5V supply; EN pin synchronized with USB enumeration status. Use Value: 300mA capacity supports peak backlight and touch scan currents; DFN thermal pad enables reliable operation at 500mW dissipation in confined enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2125K-2.5TRG1 | Same 2.5V output, 300mA rating, SOT-23-5 package; lacks BYP pin and EN pull-high default; higher IQ (85µA typ.) | No integrated noise-filtering path - requires external RC network for comparable noise performance | Select when board space permits SOT-23-5 and BYP functionality is not required; lower cost in high-volume SOT-23 assembly |
| MCP1700T-2502E/MB | 2.5V, 250mA, SOT-23-3; 1.6µA IQ, no EN/BYP; dropout 600mV @ 250mA - significantly higher than PAM3101DAB250 | Optimized for ultra-low-power sleep modes only; unsuitable for 300mA continuous loads or noise-critical analog rails | Choose only for sub-100µA average current applications where dropout and PSRR are secondary to quiescent current |
Compared with AP2125K-2.5TRG1 and MCP1700T-2502E/MB, the PAM3101DAB250 uniquely combines 300mA capability, 180mV dropout, 70dB PSRR, and integrated BYP filtering in a 1.6mm² DFN - making it optimal for space-constrained, noise-sensitive, medium-current portable designs.
Availability
PAM3101DAB250 is available at Aetrix Electronics and suitable for Bluetooth earphones, Wi-Fi sensor nodes, portable medical monitors, and USB-C accessories requiring stable component supply, long-term lifecycle support, and validated thermal performance in DFN packaging.
Supply support for PAM3101DAB250 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The PAM3101 belongs to Diodes' high-PSRR, low-IQ LDO family targeting portable and battery-powered applications where noise immunity, small size, and extended runtime are critical design requirements.
FAQ
What is the recommended output capacitor value and type for PAM3101DAB250?
The PAM3101DAB250 is stable with a minimum 2.2µF ceramic capacitor (X5R or X7R dielectric) on VOUT, with ESR > 5mΩ. Larger values improve load-transient response and PSRR but do not affect stability. Tantalum or aluminum electrolytic capacitors are not required or recommended.
Does PAM3101DAB250 require an input capacitor, and if so, what value?
Yes - a minimum 1µF ceramic capacitor is recommended on VIN, placed within 0.5 inch of the device. This reduces input impedance and mitigates noise coupling from upstream sources. No upper limit exists; larger values further improve line-transient response and PSRR.
How does the BYP pin function, and what capacitor should be used?
The BYP pin connects internally to a 200kΩ resistor forming a low-pass filter with an external 10nF capacitor to GND. This reduces high-frequency output noise (10Hz–100kHz) to ~50µVRMS. Increasing capacitance lowers noise slightly but extends startup time; 10nF is the optimized value per datasheet.
Is PAM3101DAB250 pin-compatible with other PAM3101 variants?
No - PAM3101DAB250 uses the DFN1.6x1.6-6L package with specific pinout (VIN/NC/VIN/VOUT/NC/GND). It is not pin-compatible with SOT-23-3, SOT-23-5, SOT-89, or SC-70 variants due to differing pin counts, functions, and physical layout. PCB redesign is required for package substitution.
PAM3101DAB250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.45V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
PAM3101DAB250 FAQ
1.How can I place an order for PAM3101DAB250 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM3101DAB250 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PAM3101DAB250 reliable?
The price and inventory of PAM3101DAB250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM3101DAB250 is usually 5 days.
3.What payment methods are accepted for PAM3101DAB250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM3101DAB250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM3101DAB250?
PAM3101DAB250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM3101DAB250 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PAM3101DAB250?
For technical support, including PAM3101DAB250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM3101DAB250 requirements.
6.How does Aetrix verify that PAM3101DAB250 is sourced from the original manufacturer or authorized distributors?
All PAM3101DAB250 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PAM3101DAB250 meets industry standards.
7.What is the process for return or replacement of PAM3101DAB250?
All PAM3101DAB250 units undergo pre-shipment inspection (PSI). If there is an issue with PAM3101DAB250, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PAM3101DAB250 part is unused and in its original packaging.
Return procedure for PAM3101DAB250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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