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Diodes Incorporated PAM2305AAB250
- Part No.:
- PAM2305AAB250
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
PAM2305AAB250.pdf
- Description:
- IC REG BUCK 2.5V 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,917
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Product details
Overview
PAM2305AAB250 from Diodes Incorporated is a 1A synchronous step-down DC-DC converter with adjustable/fixed 2.5V output, current-mode PWM/PSM control, 1.5MHz switching frequency, and internal MOSFETs. It operates from 2.5V–5.5V input (single Li+/USB/alkaline), delivers up to 1A load current, and achieves 96% peak efficiency in portable power rails for microcontroller cores and RF modules.
For engineers reviewing the PAM2305AAB250 datasheet, PAM2305AAB250 pinout, PAM2305AAB250 application, or PAM2305AAB250 equivalent, key selection criteria include its 0.6V feedback reference, 40µA quiescent current in PSM mode, TSOT25 package thermal limits (250°C/W θJA), and EN pin logic thresholds (1.5V high / 0.3V low).
Technical Context
The PAM2305AAB250 uses current-mode control with fixed-frequency PWM at 1.5MHz under heavy load and automatic transition to pulse-skipping modulation (PSM) below ~100mA to maintain high light-load efficiency. Its internal synchronous rectifier eliminates external diode losses and supports continuous conduction mode down to 100% duty cycle near dropout.
It integrates over-temperature protection (150°C trip, 30°C hysteresis), cycle-by-cycle peak current limiting (1.5A typical), and under-voltage lockout (UVLO) to prevent deep battery discharge. The 0.6V precision feedback reference enables accurate output regulation across line/load/temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li+/Li-Po, USB 5V, or 3× alkaline/NiMH batteries without pre-regulation. |
| Output Voltage | Fixed 2.5V - set internally; no external resistors required for nominal operation. |
| Max Output Current | 1A - limited by thermal dissipation in TSOT25 package (400mW max at TA=25°C). |
| Switching Frequency | 1.5MHz (typ) - enables compact 2.2µH inductor and ceramic capacitor solution with minimal board area. |
| Quiescent Current | 40µA (typ) - extends battery runtime in always-on sensor nodes and standby modes. |
| Feedback Reference | 0.6V ±2% - defines output accuracy; enables precise 2.5V setting via internal resistor divider. |
| EN Threshold | 1.5V (high), 0.3V (low) - compatible with standard GPIO logic levels for controlled enable/disable sequencing. |
Pinout & Package
Supplied in TSOT25 (SOT-25) 5-pin package: 2.9mm × 1.6mm × 0.9mm body, exposed thermal pad, RoHS-compliant, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 2.5–5.5V supply; connects to input capacitor and internal high-side PMOS gate driver. |
| GND | Power ground | Common return for VIN, VOUT, and internal circuitry; must be low-impedance connection to thermal pad. |
| EN | Enable control input | Active-high logic input; >1.5V enables regulator, <0.3V forces shutdown with <0.1µA supply current. |
| VOUT/FB | Output voltage sense / feedback | Monitors regulated output; internal 0.6V reference compares against divided VOUT to control duty cycle. |
| SW | Switch node | Drain connection of internal high-side PMOS and low-side NMOS; drives external inductor and requires tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated NMOS replaces external Schottky diode, eliminating forward drop loss and enabling >96% efficiency at 1A. |
| Pulse-skipping modulation (PSM) | Reduces IQ to 40µA under light load, extending battery life in intermittent-activity devices like remote sensors. |
| Soft-start | Digital-controlled ramp limits inrush current during startup, preventing input rail collapse and output overshoot. |
| Short-circuit protection | Cycle-by-cycle current limit (1.5A peak) and 400kHz fallback frequency limit fault energy during output shorts. |
| Thermal shutdown | 150°C junction trip with 30°C hysteresis ensures safe recovery before resuming operation after cooling. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Battery-powered BLE/Wi-Fi sensor collecting temperature, humidity, and motion data every 5 seconds. IC Role / Device Role / Timing Role: Primary 2.5V power rail for MCU, radio SoC, and analog front-end ADC. Use Value: 40µA quiescent current minimizes sleep-mode drain; 1.5MHz switching allows tiny 2.2µH inductor and 10µF ceramic caps. |
Use Scenario: Handheld pulse oximeter operating from two AAA alkaline cells with 8-hour runtime requirement. IC Role / Device Role / Timing Role: Regulates stable 2.5V supply for optical sensor array, analog signal chain, and low-power display driver. Use Value: 2.5V fixed output matches sensor bias requirements; UVLO prevents battery over-discharge below 2.5V input threshold. |
| USB-C Powered Peripheral | Industrial IoT Edge Controller |
|
Use Scenario: Compact USB-C dock providing 2.5V to FPGA I/O banks and level-shifting buffers. IC Role / Device Role / Timing Role: Point-of-load (POL) regulator converting 5V USB-C VBUS to clean 2.5V rail. Use Value: 1.5MHz operation avoids AM radio band interference; TSOT25 footprint fits tight space constraints near connector. |
Use Scenario: DIN-rail mounted gateway with ARM Cortex-M7 MCU, RS-485 transceivers, and isolated CAN interface. IC Role / Device Role / Timing Role: Secondary 2.5V supply for analog comparators, reference buffers, and sensor excitation circuits. Use Value: -40°C to +85°C operating range ensures reliability in uncontrolled environments; thermal shutdown protects against enclosure overheating. |
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 |
|---|---|---|---|
| AP3418KTR-G1 (Diodes Inc.) | Same 1A rating, 2.5V fixed output, but 2.5MHz switching and DFN2x2-6 package (lower θJA = 68°C/W). | Better thermal performance for sustained 1A loads; requires different PCB footprint and layout. | Select when ambient temperature exceeds 60°C or continuous full-load operation is required. |
| TPS62231DRYR (TI) | 1A, 2.5V fixed, 3MHz switching, 25µA IQ, but requires external compensation and lacks integrated soft-start. | Higher frequency enables smaller passives but increases EMI sensitivity; no built-in UVLO or thermal shutdown. | Select when ultra-low IQ and minimal BOM count outweigh need for integrated protection features. |
Compared with AP3418KTR-G1 and TPS62231DRYR, the PAM2305AAB250 offers balanced integration-retaining soft-start, UVLO, thermal shutdown, and PSM in a cost-effective TSOT25 package-making it optimal for space-constrained, battery-sensitive designs where moderate thermal headroom suffices.
Availability
PAM2305AAB250 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, USB-C powered peripherals, and industrial IoT edge controllers requiring stable component supply and long-term manufacturability.
Supply support for PAM2305AAB250 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 ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The PAM2305 belongs to Diodes' Power Management IC product line, designed specifically for high-efficiency, low-quiescent-current DC-DC conversion in space- and battery-constrained portable electronics.
FAQ
What is the maximum continuous output current for PAM2305AAB250 in TSOT25 package?
The maximum continuous output current is 1A under conditions where junction temperature remains ≤125°C. With θJA = 250°C/W and TA = 25°C, the practical limit is ~700mA at full load due to 400mW power dissipation ceiling; derating is required above 60°C ambient.
Can PAM2305AAB250 operate with input voltage equal to output voltage?
Yes-it supports 100% duty cycle operation down to VIN ≈ VOUT + IOUT × RDS(ON). At 2.5V output and 1A load, dropout occurs near VIN = 2.5V + 0.45Ω × 1A = 2.95V, enabling use with nearly depleted single-cell Li+ batteries.
Is an external feedback resistor network required for PAM2305AAB250?
No. The "250" suffix indicates factory-trimmed 2.5V fixed output; internal resistor divider sets VOUT = 2.5V directly. The FB pin is internally connected and not accessible for adjustment-no external resistors needed.
How does the PAM2305AAB250 handle short-circuit events on the output?
During output short, it limits peak switch current to ~1.5A per cycle and reduces operating frequency to ~400kHz with minimum duty cycle, limiting average input current to ~200mA. This prevents thermal runaway while maintaining device integrity until fault clears.
PAM2305AAB250 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):
- 2.5V
- 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
PAM2305AAB250 FAQ
1.How can I place an order for PAM2305AAB250 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2305AAB250 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 PAM2305AAB250 reliable?
The price and inventory of PAM2305AAB250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2305AAB250 is usually 5 days.
3.What payment methods are accepted for PAM2305AAB250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2305AAB250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2305AAB250?
PAM2305AAB250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2305AAB250 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 PAM2305AAB250?
For technical support, including PAM2305AAB250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2305AAB250 requirements.
6.How does Aetrix verify that PAM2305AAB250 is sourced from the original manufacturer or authorized distributors?
All PAM2305AAB250 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 PAM2305AAB250 meets industry standards.
7.What is the process for return or replacement of PAM2305AAB250?
All PAM2305AAB250 units undergo pre-shipment inspection (PSI). If there is an issue with PAM2305AAB250, 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 PAM2305AAB250 part is unused and in its original packaging.
Return procedure for PAM2305AAB250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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