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Diodes Incorporated PAM3101AAA180
- Part No.:
- PAM3101AAA180
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PAM3101AAA180.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,512
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Product details
Overview
PAM3101AAA180 from Diodes Incorporated is a 1.8V 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 PAM3101AAA180 datasheet, PAM3101AAA180 pinout, PAM3101AAA180 application, or PAM3101AAA180 equivalent, key selection criteria include dropout voltage at full load, thermal performance in SOT-23-3, EN pin logic configuration (floating default), BYP capacitor requirement (10nF), and compatibility with ≥2.2µF ceramic output capacitors.
Technical Context
The PAM3101AAA180 integrates a P-channel MOSFET pass transistor (RDS(on) ≈ 0.75Ω) enabling ultra-low ground current across load range and eliminating body-diode conduction during shutdown. Its internal bandgap reference and error amplifier deliver ±2% output voltage accuracy over line, load, and temperature.
It features active high enable (EN), bypass (BYP) pin for noise filtering via external 10nF capacitor, thermal shutdown at +150°C with +30°C hysteresis, and current limiting set to ~400mA-ensuring robust operation in compact, thermally constrained handheld designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V fixed, ±2% accuracy ensures stable core supply for 1.8V I/O or low-power microcontrollers. |
| Max Output Current | 300mA continuous-supports moderate-power RF modules or sensor subsystems without thermal derating in SOT-23. |
| Dropout Voltage | 180mV @ 300mA (VO = 3.3V spec; extrapolated to 1.8V per typical curve) enables usable battery life down to ~1.98V input. |
| Quiescent Current | 65µA typ.-extends battery runtime in always-on standby modes of Bluetooth earphones or wearables. |
| PSRR | 70dB @ 1kHz-suppresses switching noise from DC-DC converters feeding the LDO input in mixed-power systems. |
| Enable Threshold | VTH = 1.5V min (high), VTL = 0.3V max (low)-compatible with 1.8V GPIO control without level-shifting. |
| Thermal Shutdown | Activates at +150°C with +30°C hysteresis-prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
Package: SOT-23-3 (JEDEC MO-178AA), 2.92mm × 1.3mm × 1.0mm, 3-pin surface-mount, lead-free.
| 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 1.8V ±2% to load; requires ≥2.2µF ceramic capacitor with ESR >5mΩ for stability. |
| 3 (VIN) | Input supply | Accepts 2.5V–5.5V; minimum VIN = VO + VDROP ≈ 1.98V at full load. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout architecture | 180mV @ 300mA enables operation from single Li-ion cell down to end-of-discharge (~2.0V). |
| High PSRR with BYP pin | 70dB @ 1kHz + 10nF BYP-to-GND capacitor reduces output ripple in noise-sensitive analog/RF sections. |
| Ultra-low quiescent current | 65µA typ. maintains efficiency in battery-backed real-time clocks or always-on wake-up circuits. |
| Integrated protection | Current limit (~400mA), short-circuit foldback, and thermal shutdown prevent field failures in unattended devices. |
| Fast discharge function | Internal NMOS discharges VOUT when EN is low-eliminates hold-up voltage that could delay system reset. |
Applications
| Bluetooth Earphones | Digital Cameras |
|---|---|
|
Use Scenario: Powering 1.8V audio codec and Bluetooth baseband IC in compact wireless earbud PCBs with tight thermal and space constraints. IC Role / Device Role / Timing Role: Primary low-noise post-regulator for RF/analog signal chain, rejecting noise from shared buck converter input rail. Use Value: 70dB PSRR prevents audible switching artifacts in audio output; 65µA IQ extends talk time by >12% vs. legacy LDOs. |
Use Scenario: Supplying image sensor interface and memory controller in pocket-sized digital cameras operating from dual AA or Li-ion batteries. IC Role / Device Role / Timing Role: Stable 1.8V domain regulator for high-speed parallel data buses between sensor and processor. Use Value: ±2% output accuracy ensures consistent ADC reference and timing margin; 180mV dropout preserves usable battery range down to 1.98V. |
| MP3 Players | WLAN Modules |
|
Use Scenario: Regulating power to 1.8V NAND flash memory and audio DAC in portable music players with 20+ hour battery life targets. IC Role / Device Role / Timing Role: Low-noise local regulator decoupling flash I/O and audio playback circuitry from noisy system PMIC rails. Use Value: Fast discharge clears VOUT within 100µs on shutdown-enabling deterministic power sequencing and preventing latch-up during sleep/wake cycles. |
Use Scenario: Providing clean 1.8V supply to WLAN SoC RF transceiver and MAC logic in IoT edge nodes powered by energy-harvesting sources. IC Role / Device Role / Timing Role: Final-stage LDO ensuring PSRR-limited noise floor for 2.4GHz receiver sensitivity and transmit spectral purity. Use Value: Thermal shutdown at +150°C protects against ambient + self-heating in sealed enclosures; SOT-23 footprint minimizes board area. |
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-18W5 | Same 1.8V output, 300mA rating, but uses SOT-25 package (5-pin, includes EN/BYP); 60µA IQ, 170mV dropout @ 300mA. | Requires explicit EN pull-up; BYP pin is dedicated (no floating risk); slightly better dropout and IQ. | Preferred where board layout allows 5-pin package and precise enable control is needed. |
| MCP1700T-1802E/TT | 1.8V, 250mA, 1.6µA IQ (ultra-low), 600mV dropout @ 250mA; SOT-23-3, no EN/BYP pins. | No enable or bypass functionality; optimized for ultra-long-life coin-cell applications-not suitable for 300mA loads. | Select only for sub-250mA, ultra-low-IQ use cases where PSRR and fast transient response are secondary. |
Compared with AP2125K-18W5, PAM3101AAA180 offers identical output and package but lacks dedicated EN/BYP pins-simplifying design where floating-enable suffices. Versus MCP1700, it delivers 20% higher current and 40× higher PSRR at cost of 40× higher IQ-making it optimal for mid-power portable audio and RF.
Availability
PAM3101AAA180 is available at Aetrix Electronics and suitable for Bluetooth earphones, digital cameras, and MP3 players requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for PAM3101AAA180 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, specializing in high-reliability power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The PAM3101 belongs to Diodes' precision LDO portfolio targeting portable electronics-designed specifically for low-noise, low-IQ, and small-footprint requirements in battery-constrained devices.
FAQ
What is the minimum input voltage required for PAM3101AAA180 to maintain 1.8V output at 300mA?
The minimum input voltage is VO + VDROP. Per datasheet, dropout is 180mV @ 300mA for VO = 3.3V; for VO = 1.8V, typical dropout is ~150mV (extrapolated from Figure 12). Thus, minimum VIN ≈ 1.95V. Below this, regulation fails and VOUT drops linearly with VIN.
Can PAM3101AAA180 be used without connecting the EN pin?
Yes. The EN pin defaults to floating-high logic (internal pull-up), so the device powers up enabled without external connection. However, if system-level control is needed, tie EN to VIN for ON or GND for OFF-no external pull-up resistor is required.
Is a bypass capacitor mandatory on the BYP pin?
Yes. A 10nF capacitor from BYP to GND is required to achieve specified PSRR (70dB @ 1kHz) and reduce output noise to 50µVRMS. Omitting it degrades high-frequency noise rejection and may increase output ripple in RF-sensitive applications.
What thermal derating applies when using PAM3101AAA180 in SOT-23-3 at 300mA?
In still air on a 1-layer JEDEC test board, θJA = 250°C/W. At 300mA and VIN = 3.3V, power dissipation is ~450mW. This yields ΔT = 112.5°C rise-exceeding safe junction limits. Derate current to ≤180mA or improve PCB copper area/heatsinking to maintain TJ < 125°C.
PAM3101AAA180 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.1V @ 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
PAM3101AAA180 FAQ
1.How can I place an order for PAM3101AAA180 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM3101AAA180 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 PAM3101AAA180 reliable?
The price and inventory of PAM3101AAA180 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM3101AAA180 is usually 5 days.
3.What payment methods are accepted for PAM3101AAA180?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM3101AAA180 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM3101AAA180?
PAM3101AAA180 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM3101AAA180 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 PAM3101AAA180?
For technical support, including PAM3101AAA180 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM3101AAA180 requirements.
6.How does Aetrix verify that PAM3101AAA180 is sourced from the original manufacturer or authorized distributors?
All PAM3101AAA180 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 PAM3101AAA180 meets industry standards.
7.What is the process for return or replacement of PAM3101AAA180?
All PAM3101AAA180 units undergo pre-shipment inspection (PSI). If there is an issue with PAM3101AAA180, 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 PAM3101AAA180 part is unused and in its original packaging.
Return procedure for PAM3101AAA180:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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