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Diodes Incorporated PAM2301CAAB250
- Part No.:
- PAM2301CAAB250
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
PAM2301CAAB250.pdf
- Description:
- IC REG BUCK 2.5V 800MA TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,658
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Product details
Overview
PAM2301CAAB250 from Diodes Incorporated is a 800mA synchronous step-down DC-DC converter in TSOT25 package, operating from 2.5V–5.5V input and delivering adjustable or fixed 2.5V output with 0.6V feedback reference, 1.5MHz switching frequency, and 96% peak efficiency-used in battery-powered portable electronics for stable core voltage regulation.
For engineers reviewing the PAM2301CAAB250 datasheet, PAM2301CAAB250 pinout, PAM2301CAAB250 application, or PAM2301CAAB250 equivalent, key selection criteria include light-load quiescent current (40µA typ), shutdown current (<0.1µA), internal MOSFET RDS(ON) (0.30Ω/0.35Ω), thermal shutdown at +150°C, and UVLO protection to prevent deep battery discharge.
Technical Context
The PAM2301CAAB250 employs current-mode PWM control with pulse-skipping modulation (PSM) for seamless transition between heavy-load stability and ultra-low quiescent current under light load. Its internal synchronous rectifier eliminates external diode losses, while soft-start limits inrush current and prevents output overshoot during power-up.
Feedback is implemented via a precision 0.6V reference with ±2% accuracy over temperature and line/load conditions; output voltage is set externally using a resistive divider on the VOUT/FB pin. The device supports 100% duty-cycle operation near VIN ≈ VOUT and includes cycle-by-cycle peak current limiting (1.5A typ) and short-circuit foldback at ~400kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single Li+/Li-Po cell, USB, or multi-cell alkaline/NiMH sources |
| Output Voltage | Fixed 2.5V - pre-set by internal resistor network; no external feedback required |
| Max Output Current | 800mA - continuous DC load capability with thermal derating above +85°C ambient |
| Switching Frequency | 1.5MHz (typ) - enables compact LC filter design with ≤4.7µH inductor and ceramic capacitors |
| Quiescent Current | 40µA (typ) - extends battery runtime in standby/sleep modes of portable devices |
| Efficiency | Up to 96% - achieved via integrated synchronous MOSFETs and low RDS(ON) (0.30Ω P-ch / 0.35Ω N-ch) |
| Shutdown Current | <0.1µA - isolates input from output, minimizing battery drain in system-off state |
| Feedback Reference | 0.600V ±2% - sets output accuracy and enables precise external adjustment if used in ADJ variant |
Pinout & Package
Supplied in a 5-pin TSOT25 surface-mount package (2.9mm × 2.8mm × 1.0mm), the PAM2301CAAB250 integrates power switches and feedback circuitry into a thermally optimized footprint with exposed pad for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Logic-high (>1.5V) activates regulator; logic-low (<0.3V) disables output and reduces IQ to <0.1µA |
| 2 - GND | Power and signal ground | Common return path for input/output currents and feedback reference; must be low-impedance |
| 3 - SW | Switch node | Drain connection of internal P-ch and N-ch MOSFETs; carries high-frequency square-wave voltage and ripple current |
| 4 - VIN | Main power input | Accepts 2.5–5.5V supply; requires local 10µF low-ESR ceramic capacitor placed adjacent to pin |
| 5 - VOUT/FB | Output voltage sense / feedback | Monitors regulated output via internal 0.6V reference; in fixed-2.5V version, internally connected to divider |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving efficiency across load range |
| Pulse-skipping mode (PSM) | Reduces switching activity under light load, maintaining >85% efficiency at 1mA output while holding IQ at 40µA |
| Integrated soft-start | Gradually ramps output voltage over ~1ms to limit inrush current and prevent input rail sag |
| Thermal shutdown with hysteresis | Shuts down at +150°C junction temp and auto-restarts at +120°C, preventing sustained overheating damage |
| Under-voltage lockout (UVLO) | Disables operation below ~2.3V VIN to avoid unstable regulation and protect battery from over-discharge |
Applications
| Wireless Headset Power Management | Digital Camera Core Supply |
|---|---|
Use Scenario: Dual-rail power delivery for Bluetooth audio SoC and MEMS microphone in compact wearable headset. IC Role / Device Role / Timing Role: Primary 2.5V buck regulator supplying processor core and RF transceiver from single Li-Po cell. Use Value: 96% efficiency and 40µA quiescent current extend talk time by >18% versus legacy asynchronous converters. | Use Scenario: Stable 2.5V rail for image sensor interface and ISP logic in battery-powered digital camera. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter replacing LDO to reduce thermal load during burst capture sequences. Use Value: Synchronous architecture delivers full 800mA without thermal throttling, enabling faster frame rates. |
| USB-C Peripheral Hub | Smart Thermostat MCU Supply |
Use Scenario: Power conversion for USB-C powered docking station supporting HDMI, USB 3.0, and Ethernet. IC Role / Device Role / Timing Role: Input-stage buck converting 5V USB-C bus to 2.5V for USB controller and level-shifting logic. Use Value: 1.5MHz switching allows use of 2.2µH inductor and 10µF X7R ceramics, shrinking total solution size by 35%. | Use Scenario: Always-on 2.5V supply for ARM Cortex-M4 MCU and wireless transceiver in HVAC control panel. IC Role / Device Role / Timing Role: Primary system regulator enabling low-power sleep mode with sub-1µA system standby current. Use Value: UVLO and thermal shutdown ensure reliable operation across -40°C to +85°C industrial temperature range. |
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 | 3MHz switching frequency, 0.6V reference, but only 300mA output current and no PSM mode | Limited to lower-power microcontrollers; unsuitable for 800mA loads like displays or radios | Select when board space is critical and load current ≤300mA; not drop-in for PAM2301CAAB250's full capability |
| RT8059GJ6 | 1.5MHz, 800mA, 0.6V reference, but lacks integrated soft-start and has higher 65µA quiescent current | Requires external soft-start circuitry; reduced battery life in always-on IoT sensors | Choose only if cost sensitivity outweighs efficiency and startup reliability requirements |
Compared with TPS62231DRYR and RT8059GJ6, the PAM2301CAAB250 uniquely combines 800mA capability, 40µA quiescent current, integrated soft-start, and thermal/UVLO protection in a single TSOT25 package-making it optimal for space-constrained, battery-sensitive portable systems requiring robust, self-contained regulation.
Availability
PAM2301CAAB250 is available at Aetrix Electronics and suitable for wireless headsets, digital cameras, USB-C peripheral hubs, and smart thermostats requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for PAM2301CAAB250 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 PAM2301 belongs to Diodes' high-density DC-DC converter product line, engineered specifically for portable battery-powered applications where small footprint, low quiescent current, and thermal resilience are critical design constraints.
FAQ
What is the function of the VOUT/FB pin on the PAM2301CAAB250?
The VOUT/FB pin serves as both output voltage monitor and feedback input. In the fixed-2.5V variant (CAAB250), it connects internally to a precision resistive divider referenced to the 0.6V bandgap. External feedback is not required, but the pin remains accessible for optional monitoring or loop compensation if needed.
Does the PAM2301CAAB250 require external compensation components?
No. The PAM2301CAAB250 uses internal compensation optimized for standard 4.7µH inductors and 10µF ceramic capacitors. No external RC networks or compensation pins are provided-simplifying layout and reducing BOM count while maintaining stability across input voltage and load ranges.
Can the PAM2301CAAB250 operate with a 2.4V input voltage?
No. The absolute minimum recommended input voltage is 2.5V per datasheet specifications. At 2.4V, the device may fail to start due to UVLO activation or deliver unstable output due to insufficient headroom for the internal P-channel switch's RDS(ON) drop, especially under load.
How does the PAM2301CAAB250 handle short-circuit conditions?
During output short-circuit, the PAM2301CAAB250 enters hiccup-mode-like protection: peak current is limited to ~1.5A per cycle, switching frequency drops to ~400kHz, and average input current is clamped to ~200mA. This prevents thermal runaway while allowing automatic recovery once the fault is removed.
PAM2301CAAB250 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:
- 800mA
- 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
PAM2301CAAB250 FAQ
1.How can I place an order for PAM2301CAAB250 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2301CAAB250 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 PAM2301CAAB250 reliable?
The price and inventory of PAM2301CAAB250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2301CAAB250 is usually 5 days.
3.What payment methods are accepted for PAM2301CAAB250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2301CAAB250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2301CAAB250?
PAM2301CAAB250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2301CAAB250 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 PAM2301CAAB250?
For technical support, including PAM2301CAAB250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2301CAAB250 requirements.
6.How does Aetrix verify that PAM2301CAAB250 is sourced from the original manufacturer or authorized distributors?
All PAM2301CAAB250 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 PAM2301CAAB250 meets industry standards.
7.What is the process for return or replacement of PAM2301CAAB250?
All PAM2301CAAB250 units undergo pre-shipment inspection (PSI). If there is an issue with PAM2301CAAB250, 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 PAM2301CAAB250 part is unused and in its original packaging.
Return procedure for PAM2301CAAB250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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