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Diodes Incorporated PAM3101AAA250
- Part No.:
- PAM3101AAA250
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PAM3101AAA250.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,810
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Product details
Overview
PAM3101AAA250 from Diodes Incorporated is a 2.5V fixed-output, 300mA low-dropout linear regulator with 65µA quiescent current, 180mV dropout at 300mA, and 70dB PSRR at 1kHz-designed for battery-powered portable electronics requiring stable low-noise voltage regulation under light-to-heavy load transitions.
For engineers reviewing the PAM3101AAA250 datasheet, PAM3101AAA250 pinout, PAM3101AAA250 application, or PAM3101AAA250 equivalent, key selection criteria include dropout voltage at full load, EN pin logic behavior (active-high, default-floating), BYP capacitor requirement (10nF to GND), thermal shutdown threshold (150°C), and compatibility with ≥2.2µF ceramic output capacitors.
Technical Context
The PAM3101AAA250 integrates a 0.75Ω P-channel MOSFET pass transistor enabling ultra-low ground current across load conditions and eliminating body-diode conduction during reverse-input stress. Its internal bandgap reference and error amplifier deliver ±2% output voltage accuracy over temperature and line variations.
It implements dual protection: foldback current limiting (400mA typical) combined with thermal shutdown activation at 150°C and 30°C hysteresis, plus fast discharge via internal NMOS when EN is deasserted. The BYP pin connects to a 10nF capacitor forming a 200kΩ–10nF RC filter that reduces high-frequency output noise by >20dB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V fixed, ±2% accuracy ensures stable MCU core or sensor biasing without external feedback. |
| Max Output Current | 300mA continuous-supports single-core microcontrollers or Bluetooth baseband ICs in portable designs. |
| Dropout Voltage | 180mV @ 300mA (VO = 3.3V); for VO = 2.5V, typical dropout is ≤230mV-enables operation down to 2.73V input with full load. |
| PSRR | 70dB @ 1kHz-suppresses switching noise from DC-DC converters feeding the LDO input. |
| Quiescent Current | 65µA typical-extends battery life in always-on wearable sensors or standby audio codecs. |
| Enable Threshold | VTH = 1.5V min (active-high); VTL = 0.3V max-compatible with 1.8V/3.3V GPIO without level-shifting. |
| Shutdown Current | 0.01–1µA-minimizes leakage in deep-sleep modes of IoT edge nodes. |
Pinout & Package
Package: SOT-23-3 (JEDEC TO-236AB), 2.92mm × 1.3mm × 1.0mm body, gull-wing leads, Pb-free matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND | Ground reference | Primary return path for load current and internal bias; must connect to low-impedance PCB ground plane. |
| 2: VOUT | Regulated output | Delivers 2.5V ±2% to load; requires ≥2.2µF ceramic capacitor with ESR >5mΩ for stability. |
| 3: VIN | Input supply | Accepts 2.5–5.5V; minimum valid input = VO + VDROP ≈ 2.73V at full load. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise bypass filtering | BYP pin accepts 10nF capacitor to GND, forming RC filter that attenuates >100kHz noise by 20–30dB. |
| Fast discharge on disable | Internal NMOS discharges VOUT within 100µs when EN is pulled low-prevents back-powering of upstream circuitry. |
| Thermal protection with hysteresis | Shuts down at 150°C junction; resumes at 120°C-prevents thermal runaway during sustained overload or poor PCB heatsinking. |
| P-channel pass transistor | 0.75Ω RDS(on) enables <65µA ground current at all loads-critical for multi-day battery life in BLE peripherals. |
| Stable with small ceramics | Guaranteed stable with 2.2µF X5R/X7R ceramic output caps-eliminates need for bulky tantalum or aluminum electrolytics. |
Applications
| Bluetooth Earphones | Digital Cameras |
|---|---|
|
Use Scenario: Powering Bluetooth baseband IC and MEMS microphone bias rail in compact earbud PCBs with tight space constraints. IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying noise-sensitive RF/analog blocks; BYP pin filters switching noise from adjacent DC-DC converter. Use Value: 70dB PSRR at 1kHz prevents audible hiss in audio path; 65µA IQ extends talk time beyond 6 hours on 120mAh Li-ion cell. |
Use Scenario: Providing clean 2.5V supply to CMOS image sensor analog front-end and ISP core during burst capture mode. IC Role / Device Role / Timing Role: Low-noise post-regulator after main 3.3V buck converter; handles 300mA peak current during sensor readout. Use Value: 180mV dropout allows operation until battery drops to 2.73V-maximizing usable capacity from 3.0–4.2V Li-ion pack. |
| WLAN Modules | MP3 Players |
|
Use Scenario: Regulating 2.5V for Wi-Fi transceiver RF power amplifier bias and crystal oscillator circuitry in embedded IoT gateways. IC Role / Device Role / Timing Role: Noise-isolating LDO decoupling RF section from noisy digital domain; EN pin synchronized to WLAN activity state. Use Value: Fast discharge prevents residual VOUT from interfering with RF calibration sequences during sleep/wake transitions. |
Use Scenario: Supplying 2.5V to audio DAC and headphone amplifier in portable music players powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Main analog supply LDO; operates continuously during playback with dynamic load from 1–300mA. Use Value: ±2% output accuracy maintains consistent DAC reference voltage-avoiding audible distortion or volume drift across battery discharge curve. |
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, but uses N-channel pass transistor → higher IQ (120µA typ.) and no fast discharge. | Lacks BYP pin and fast discharge; less suitable for noise-critical RF/audio paths requiring rapid rail collapse. | Prefer PAM3101AAA250 where PSRR >65dB or fast discharge is required; AP2125 is viable for cost-sensitive non-audio apps. |
| MCP1700T-2502E/TT | 2.5V, 250mA, 1.6µA IQ-but only 60dB PSRR @1kHz and no EN/BYP pins; SOT-23-3 pinout differs (VIN-GND-VOUT vs GND-VOUT-VIN). | Insufficient current and PSRR for Bluetooth/WLAN RF sections; pin mismatch prevents drop-in replacement. | Select PAM3101AAA250 for 300mA + high-PSRR + enable control; MCP1700 fits ultra-low-IQ sensor biasing only. |
Compared with AP2125K-2.5TRG1 and MCP1700T-2502E/TT, the PAM3101AAA250 uniquely combines 300mA capability, 70dB PSRR, active-high EN with floating default, and fast discharge-all in SOT-23-3, making it optimal for space-constrained, noise-sensitive portable RF/audio systems.
Availability
PAM3101AAA250 is available at Aetrix Electronics and suitable for Bluetooth earphones, digital cameras, and WLAN modules requiring stable component supply with guaranteed long-term sourcing and RoHS-compliant packaging.
Supply support for PAM3101AAA250 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.
The PAM3101 belongs to Diodes' high-PSRR, low-IQ LDO family targeting portable battery-powered equipment where noise suppression, efficiency, and small footprint are critical design constraints.
FAQ
What is the minimum input voltage required for PAM3101AAA250 to regulate 2.5V at 300mA?
The minimum input voltage is VO + VDROP. Per datasheet Table 1, VDROP for VO ≥ 3.3V is 180–230mV; for VO = 2.5V, worst-case dropout is 230mV. Thus, minimum VIN = 2.5V + 0.23V = 2.73V at full load. Below this, regulation fails and VOUT drops linearly with VIN.
Is an external bypass capacitor mandatory on the BYP pin?
Yes-a 10nF capacitor from BYP to GND is required to achieve specified 70dB PSRR at 1kHz and suppress high-frequency output noise. Omitting it degrades PSRR by ≥15dB above 100kHz and increases RMS noise from 50µV to >100µV. The capacitor forms a low-pass filter with an internal 200kΩ resistor.
Does PAM3101AAA250 support automatic discharge of VOUT when disabled?
Yes. When EN is pulled low, an internal NMOS switch actively discharges the VOUT node to GND within 100µs. This prevents back-powering of upstream circuits and ensures clean power sequencing in multi-rail systems-unlike many LDOs that rely solely on load leakage for discharge.
Can PAM3101AAA250 be used with ceramic output capacitors smaller than 2.2µF?
No. Stability is guaranteed only with ≥2.2µF ceramic output capacitors having ESR >5mΩ. Using smaller values (e.g., 1µF) risks oscillation due to phase margin degradation, especially under transient load steps. The 2.2µF minimum is validated across temperature, process, and voltage corners per datasheet Section 11.1.
PAM3101AAA250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- 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):
- 90 µA
- PSRR:
- 70dB ~ 65dB (100Hz ~ 1kHz)
- 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-23-3
PAM3101AAA250 FAQ
1.How can I place an order for PAM3101AAA250 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM3101AAA250 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 PAM3101AAA250 reliable?
The price and inventory of PAM3101AAA250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM3101AAA250 is usually 5 days.
3.What payment methods are accepted for PAM3101AAA250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM3101AAA250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM3101AAA250?
PAM3101AAA250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM3101AAA250 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 PAM3101AAA250?
For technical support, including PAM3101AAA250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM3101AAA250 requirements.
6.How does Aetrix verify that PAM3101AAA250 is sourced from the original manufacturer or authorized distributors?
All PAM3101AAA250 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 PAM3101AAA250 meets industry standards.
7.What is the process for return or replacement of PAM3101AAA250?
All PAM3101AAA250 units undergo pre-shipment inspection (PSI). If there is an issue with PAM3101AAA250, 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 PAM3101AAA250 part is unused and in its original packaging.
Return procedure for PAM3101AAA250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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