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Diodes Incorporated PAM3101DAB180
- Part No.:
- PAM3101DAB180
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
PAM3101DAB180.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,643
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Product details
Overview
PAM3101DAB180 from Diodes Incorporated is a 1.8V fixed-output, 300mA low-dropout CMOS linear regulator in DFN1.6x1.6-6L package with active-high enable (EN default pull-high), bypass (BYP) pin, and 180mV dropout at 300mA - optimized for noise-sensitive portable power rails in Bluetooth earphones and digital cameras.
For engineers reviewing the PAM3101DAB180 datasheet, PAM3101DAB180 pinout, PAM3101DAB180 application, or PAM3101DAB180 equivalent, key selection criteria include PSRR performance at 1kHz, thermal resistance (θJA = 175°C/W), shutdown current (0.01µA typ.), output voltage accuracy (±2%), and BYP-capacitor–dependent noise suppression.
Technical Context
The PAM3101DAB180 integrates a 0.75Ω P-channel MOSFET pass transistor enabling ultra-low quiescent current (65µA typ.) across load conditions and eliminating ground current increase under dropout. Its internal 200kΩ–10nF RC filter on the BYP pin provides frequency-selective noise attenuation without external compensation.
Stability is guaranteed with ≥2.2µF ceramic output capacitance (ESR >5mΩ), and regulation is maintained over 2.5V–5.5V input range with ±0.03% line regulation and ±1% load regulation at 300mA - supporting battery-voltage tracking in multi-rail portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V fixed, ±2% accuracy ensures stable core logic supply for low-voltage microcontrollers. |
| Dropout Voltage | 180mV @ 300mA - enables operation down to 1.98V input, extending usable battery life in single-cell Li-ion systems. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from DC-DC converters feeding adjacent analog/RF circuitry. |
| Quiescent Current | 65µA typ. - minimizes standby power loss in always-on audio subsystems. |
| Shutdown Current | 0.01µA typ. - supports deep-sleep modes with sub-nW system leakage budgets. |
| Thermal Resistance θJA | 175°C/W (DFN1.6x1.6) - allows 570mW max dissipation at +25°C ambient, suitable for compact PCB layouts. |
| BYP Pin Function | Internal 200kΩ resistor + external 10nF capacitor forms low-pass filter - reduces output noise to 50µVRMS (10Hz–100kHz). |
Pinout & Package
DFN1.6x1.6-6L package: 1.6mm × 1.6mm, 0.5mm pitch, exposed thermal pad, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: EN | Chip Enable | Active-high logic input; default pull-high enables regulator at power-up without external bias. |
| 2: NC | No Connection | Unbonded die pad - must be left floating or grounded per layout guidelines; no electrical function. |
| 3: VIN | Input Supply | Accepts 2.5V–5.5V; requires ≥1µF ceramic input capacitor placed within 0.5 inch of pin. |
| 4: VOUT | Regulated Output | Delivers 1.8V ±2% at up to 300mA; stable with ≥2.2µF ceramic output capacitor (ESR >5mΩ). |
| 5: NC | No Connection | Unbonded die pad - no routing or soldering required; may be used as thermal relief pad. |
| 6: GND | Ground Reference | Common return for input, output, and BYP capacitor; must connect directly to exposed thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Architecture | 180mV @ 300mA enables use with aging batteries down to 1.98V input while maintaining 1.8V output. |
| Integrated BYP Filter | On-chip 200kΩ resistor + external 10nF capacitor reduces broadband output noise to 50µVRMS. |
| Thermal Shutdown Protection | Activates at +150°C junction temperature with +30°C hysteresis - prevents latch-up during transient overload. |
| Current Limit & Short-Circuit Protection | 400mA foldback current limit protects against sustained short-circuit faults without external components. |
| Fast Discharge Path | Internal discharge FET pulls VOUT to GND when EN is deasserted - prevents back-powering of upstream circuits. |
Applications
| Bluetooth Earphone Power Rail | Digital Camera Image Sensor Bias |
|---|---|
|
Use Scenario: Powers low-noise audio codec and RF transceiver in compact wireless earbuds with single Li-ion cell. IC Role / Device Role / Timing Role: Primary LDO delivering clean 1.8V supply to ADC/DAC and BLE radio baseband. Use Value: 70dB PSRR at 1kHz prevents switching noise from PMU DC-DC stages from modulating audio output. |
Use Scenario: Supplies image sensor analog front-end requiring ultra-low noise and tight voltage tolerance. IC Role / Device Role / Timing Role: Low-noise bias regulator for CIS pixel array and column amplifier circuitry. Use Value: 50µVRMS output noise and ±2% voltage accuracy preserve SNR and dynamic range in 12-bit imaging. |
| MP3 Player Core Logic | WLAN Baseband IC Supply |
|
Use Scenario: Provides regulated 1.8V to ARM Cortex-M0 microcontroller and flash memory interface in portable audio players. IC Role / Device Role / Timing Role: Main logic rail regulator with fast load transient response (20mV spike @ 1mA→300mA step). Use Value: 65µA quiescent current extends playback time between charges; fast discharge prevents data corruption on shutdown. |
Use Scenario: Powers WLAN SoC baseband processor in IoT edge node with intermittent connectivity. IC Role / Device Role / Timing Role: Always-on LDO supplying clock generation and RF control logic during sleep mode. Use Value: 0.01µA shutdown current enables multi-year battery life in coin-cell–powered Wi-Fi sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2125K-18W5 | Same 1.8V output, SOT-25 package (SOT-23-5), 150mV dropout @ 300mA, 60dB PSRR @ 1kHz. | Larger θJA (250°C/W) limits power handling; lacks BYP pin for noise filtering. | Select when board space permits SOT-23-5 and noise requirements are less stringent than 50µVRMS. |
| MCP1703T-1802E/MB | 1.8V output, SOT-23-5, 600mV dropout @ 250mA, 65dB PSRR @ 120Hz, no BYP pin. | Higher dropout and lower PSRR reduce battery efficiency and noise immunity in RF-sensitive designs. | Prefer only for cost-sensitive, non-noise-critical 1.8V rails where thermal margin exceeds 100°C/W. |
Compared with AP2125K-18W5 and MCP1703T-1802E/MB, the PAM3101DAB180 delivers superior noise performance (50µVRMS vs. >100µVRMS), lower dropout (180mV vs. ≥150mV), and integrated BYP filtering - making it optimal for RF/analog co-location in space-constrained portable devices.
Availability
PAM3101DAB180 is available at Aetrix Electronics and suitable for Bluetooth earphones, digital cameras, MP3 players, and WLAN baseband modules requiring stable component supply with low-noise, low-quiescent-current regulation.
Supply support for PAM3101DAB180 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-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.
The PAM3101 belongs to Diodes' high-PSRR, low-IQ LDO product line designed specifically for battery-powered portable electronics where noise suppression, extended runtime, and small-footprint packaging are critical.
FAQ
What is the minimum input voltage required for PAM3101DAB180 to maintain 1.8V output at 300mA?
The minimum input voltage is determined by dropout: VIN(MIN) = VO + VDROP = 1.8V + 0.18V = 1.98V. This allows operation down to near end-of-discharge for single-cell Li-ion (2.5V–4.2V), preserving usable battery capacity beyond competing 200+mV-dropout regulators.
Can the BYP pin be left unconnected, or is the 10nF capacitor mandatory?
The 10nF capacitor on the BYP pin is mandatory for specified noise performance: without it, output noise rises from 50µVRMS to >150µVRMS. The internal 200kΩ resistor forms a low-pass filter only when the capacitor is present - leaving BYP open degrades PSRR above 10kHz and increases broadband noise.
Does PAM3101DAB180 require an external pull-down on EN for proper startup behavior?
No - EN is internally pulled high by default, so the device powers up enabled when VIN is applied. An external pull-down is unnecessary and would prevent regulation. Only add external logic if active control of enable/disable sequencing is required in multi-rail systems.
How does thermal performance differ between DFN1.6x1.6 and SOT-23 packages for the same PAM3101 output voltage?
DFN1.6x1.6 offers θJA = 175°C/W versus SOT-23's 250°C/W - a 30% improvement in thermal efficiency. At 300mA and 3.3V input, DFN dissipates ~450mW with ~79°C junction rise, while SOT-23 reaches ~113°C rise, risking thermal shutdown in enclosed enclosures without airflow.
PAM3101DAB180 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
PAM3101DAB180 FAQ
1.How can I place an order for PAM3101DAB180 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM3101DAB180 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 PAM3101DAB180 reliable?
The price and inventory of PAM3101DAB180 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM3101DAB180 is usually 5 days.
3.What payment methods are accepted for PAM3101DAB180?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM3101DAB180 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM3101DAB180?
PAM3101DAB180 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM3101DAB180 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 PAM3101DAB180?
For technical support, including PAM3101DAB180 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM3101DAB180 requirements.
6.How does Aetrix verify that PAM3101DAB180 is sourced from the original manufacturer or authorized distributors?
All PAM3101DAB180 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 PAM3101DAB180 meets industry standards.
7.What is the process for return or replacement of PAM3101DAB180?
All PAM3101DAB180 units undergo pre-shipment inspection (PSI). If there is an issue with PAM3101DAB180, 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 PAM3101DAB180 part is unused and in its original packaging.
Return procedure for PAM3101DAB180:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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