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Diodes Incorporated PAM2305AAB280
- Part No.:
- PAM2305AAB280
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
PAM2305AAB280.pdf
- Description:
- IC REG BUCK 2.8V 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:3,509
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Product details
Overview
PAM2305AAB280 from Diodes Incorporated is a 1A synchronous step-down DC-DC converter with fixed 2.8V output, operating from 2.5V–5.5V input, delivering up to 96% efficiency and 40µA typical quiescent current in PSM mode-designed for battery-powered portable electronics requiring stable low-noise power rail generation.
For engineers reviewing the PAM2305AAB280 datasheet, PAM2305AAB280 pinout, PAM2305AAB280 application, or PAM2305AAB280 equivalent, key selection criteria include its 1.5MHz switching frequency, 0.6V feedback reference, TSOT25 package thermal resistance (θJA = 250°C/W), and integrated high-side/low-side MOSFETs enabling compact, high-efficiency buck regulation in space-constrained designs.
Technical Context
The PAM2305AAB280 employs current-mode PWM control with pulse-skipping modulation (PSM) for light-load efficiency optimization, maintaining regulation across 2.5V–5.5V input while delivering fixed 2.8V at up to 1A. Its internal 0.6V reference and feedback architecture enable precise output voltage accuracy (±3%) independent of load and line variation.
Thermal shutdown activates at 150°C with 30°C hysteresis, and under-voltage lockout prevents operation below VIN threshold. The device integrates soft-start to limit inrush current and cycle-by-cycle peak current limiting (1.5A typ) for short-circuit protection-ensuring robust operation in dynamic load environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±3% - eliminates external feedback resistors and simplifies layout for dedicated rail generation. |
| Input Voltage Range | 2.5V to 5.5V - supports single Li+/Li-Po cell, USB VBUS, or multi-cell alkaline/NiMH sources without pre-regulation. |
| Max Output Current | 1A continuous - limited by thermal dissipation in TSOT25 package (PD ≤ 400mW at TA = 25°C). |
| Switching Frequency | 1.5MHz (typ) - enables use of small 2.2µH inductors and ceramic capacitors for minimal footprint and low EMI. |
| Quiescent Current | 40µA (typ) in PSM mode - extends battery runtime in standby/sleep states of portable devices. |
| Feedback Reference | 0.6V internal reference - sets output via resistor divider; fixed-output variant bypasses external R1/R2. |
| Shutdown Current | <0.1µA - fully isolates input from output during disable, preventing battery drain in off-state. |
Pinout & Package
Supplied in a 5-pin TSOT25 (SOT-25) package with exposed thermal pad (1.90 × 1.90 mm), optimized for low-profile PCB layouts and moderate power dissipation (θJA = 250°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 2.5V–5.5V supply; connects directly to input capacitor to minimize high-frequency ripple injection. |
| GND | Power ground | Common return path for input/output currents and IC bias; must be low-impedance connection to thermal pad. |
| EN | Enable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) disables converter and reduces IQ to <0.1µA. |
| VOUT/FB | Output voltage sense / feedback | Internally connected to 2.8V output; no external resistor required-pin serves as regulated output node. |
| SW | Switch node | Drain connection of internal high-side and synchronous rectifier MOSFETs; requires tight layout to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated high-side P-MOSFET and low-side N-MOSFET eliminate external diode, improving efficiency by ~8% vs. asynchronous design. |
| 1.5MHz constant-frequency PWM | Enables use of sub-3mm inductors and 10µF ceramic capacitors, reducing solution size by >40% versus 500kHz converters. |
| Soft-start circuit | Digital ramp limits inrush current to prevent input voltage sag and output overshoot during startup. |
| Over-temperature protection | Shuts down at 150°C junction temperature and auto-restarts at 120°C-prevents thermal runaway without external monitoring. |
| Short-circuit protection | Cycle-by-cycle peak current limit (1.5A typ) and 400kHz fallback mode limit average input current to ~200mA during fault. |
Applications
| Wireless Headset Power Rail | Digital Camera Core Logic Supply |
|---|---|
|
Use Scenario: Powers Bluetooth audio SoC and MEMS microphone in ultra-thin wireless earbuds with single Li-ion cell. IC Role / Device Role / Timing Role: Primary buck regulator generating clean 2.8V rail for RF and digital core domains. Use Value: 40µA quiescent current extends standby time beyond 72 hours; 1.5MHz switching avoids audible noise in audio band. |
Use Scenario: Supplies image sensor interface and ISP logic in compact point-and-shoot cameras powered by two AA cells. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter replacing linear regulator to reduce heat and extend battery life. Use Value: 96% efficiency at 500mA load cuts power loss by 65% vs. LDO, enabling smaller battery and longer capture duration. |
| Smart Wearable Sensor Hub | USB-C Peripheral Power Management |
|
Use Scenario: Powers motion sensor fusion engine and BLE radio in wrist-worn health monitor using 3.7V Li-Po cell. IC Role / Device Role / Timing Role: Main system regulator delivering stable 2.8V to MCU and analog front-end. Use Value: UVLO prevents deep discharge below 2.5V, preserving battery cycle life; TSOT25 footprint fits <8mm² board area. |
Use Scenario: Generates 2.8V auxiliary rail for USB-C controller and port-power switch in compact docking station. IC Role / Device Role / Timing Role: Secondary buck stage stepping down 5V USB VBUS to low-noise logic supply. Use Value: Shutdown current <0.1µA ensures zero parasitic drain when host is disconnected-critical for energy certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 2.8V fixed output, 1.5A rating, 3.6MHz switching, 17µA IQ - higher frequency but lower max current and tighter input range (2.05–6.5V). | Preferred where board space is extremely constrained and higher switching frequency enables smaller passives. | Select if 1.5A output and 3.6MHz operation justify trade-offs in thermal margin and input flexibility. |
| AP63202WS-7 | 2.8V fixed output, 2A rating, 500kHz–2.5MHz programmable frequency, 25µA IQ - wider frequency range but larger DFN2020-6 package. | Better suited for higher-current loads or designs requiring EMI spread-spectrum tuning. | Choose when >1A load headroom or frequency agility outweighs TSOT25 size advantage. |
Compared with TPS62231DRYR and AP63202WS-7, the PAM2305AAB280 offers optimal balance of ultra-low quiescent current (40µA), TSOT25 footprint, and proven 1A capability at 1.5MHz-making it ideal for cost-sensitive, space-limited portable applications where thermal budget is moderate.
Availability
PAM2305AAB280 is available at Aetrix Electronics and suitable for wireless headset power rails, digital camera core logic supplies, smart wearable sensor hubs, and USB-C peripheral power management requiring stable component supply with full traceability and lifecycle support.
Supply support for PAM2305AAB280 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 computing markets.
The PAM2305 belongs to Diodes' high-density DC-DC converter product line, engineered specifically for portable electronics demanding minimal footprint, low IQ, and robust thermal performance in TSOT25 packaging.
FAQ
What is the maximum recommended output current for PAM2305AAB280 in TSOT25 package?
The maximum continuous output current is 1A, but thermal limits constrain practical operation: at TA = 25°C, junction temperature must stay below +125°C, permitting only ~400mW dissipation in TSOT25 (θJA = 250°C/W). At 1A and 2.8V output with 3.6V input, power loss exceeds this limit-derating to 700mA is advised for sustained operation without forced airflow.
Can PAM2305AAB280 be used with ceramic input and output capacitors?
Yes-ceramic capacitors are explicitly recommended. Use X5R or X7R dielectric types: 10µF input (X5R, 0603 or 0805) and 10µF output (X5R, 0603) meet RMS current and ESR requirements. Ceramic caps enable low ripple (≈15mVpp), compact layout, and stable loop response due to their near-zero ESR and high ripple current rating.
Does PAM2305AAB280 require external feedback resistors for 2.8V output?
No-PAM2305AAB280 is a fixed-output variant with internal resistor divider calibrated to 2.8V. The VOUT/FB pin is directly connected to the regulated output; no external R1/R2 network is needed, reducing BOM count and layout sensitivity compared to adjustable versions.
How does the PAM2305AAB280 behave during input undervoltage conditions?
It implements under-voltage lockout (UVLO) with a turn-on threshold of ~2.5V and hysteresis of ~0.1V. When VIN drops below UVLO threshold, regulation stops, EN remains inactive, and the device draws <0.1µA. This prevents brown-out operation and protects batteries from over-discharge in portable systems.
PAM2305AAB280 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25
PAM2305AAB280 FAQ
1.How can I place an order for PAM2305AAB280 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2305AAB280 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 PAM2305AAB280 reliable?
The price and inventory of PAM2305AAB280 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2305AAB280 is usually 5 days.
3.What payment methods are accepted for PAM2305AAB280?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2305AAB280 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2305AAB280?
PAM2305AAB280 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2305AAB280 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 PAM2305AAB280?
For technical support, including PAM2305AAB280 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2305AAB280 requirements.
6.How does Aetrix verify that PAM2305AAB280 is sourced from the original manufacturer or authorized distributors?
All PAM2305AAB280 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 PAM2305AAB280 meets industry standards.
7.What is the process for return or replacement of PAM2305AAB280?
All PAM2305AAB280 units undergo pre-shipment inspection (PSI). If there is an issue with PAM2305AAB280, 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 PAM2305AAB280 part is unused and in its original packaging.
Return procedure for PAM2305AAB280:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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