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Diodes Incorporated PAM2305AAB330
- Part No.:
- PAM2305AAB330
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
PAM2305AAB330.pdf
- Description:
- IC REG BUCK 3.3V 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:1,976
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Product details
Overview
PAM2305AAB330 from Diodes Incorporated is a 1A synchronous step-down DC-DC converter with fixed 3.3V output, operating from 2.5V–5.5V input, delivering up to 96% efficiency and 40µA quiescent current in PSM mode-designed for battery-powered portable electronics requiring stable low-noise 3.3V rail generation.
For engineers reviewing the PAM2305AAB330 datasheet, PAM2305AAB330 pinout, PAM2305AAB330 application, or PAM2305AAB330 equivalent, key selection criteria include its 1.5MHz switching frequency, internal PMOS/NMOS power stage, 0.6V feedback reference, thermal shutdown at 150°C, and TSOT25 package compatibility with space-constrained PCB layouts.
Technical Context
The PAM2305AAB330 implements current-mode PWM control with pulse-skipping modulation (PSM) for light-load efficiency optimization. Its internal 0.6V reference enables precise output regulation via external resistor divider or factory-trimmed 3.3V setting.
It integrates both high-side PMOS and low-side NMOS synchronous rectifiers, eliminating external diode losses. The 1.5MHz fixed-frequency oscillator ensures predictable EMI behavior and supports compact LC filter design with 2.2µH inductors and ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% - eliminates need for external feedback resistors in standard 3.3V supply applications. |
| Input Voltage Range | 2.5V to 5.5V - supports single Li+/Li-Po cell, USB VBUS, or dual alkaline/NiMH batteries without pre-regulation. |
| Max Output Current | 1A continuous - sufficient for microcontrollers, RF transceivers, and sensor subsystems in portable devices. |
| Switching Frequency | 1.5MHz (typ) - enables use of small 2.2µH inductors and 10µF ceramic input/output capacitors for minimal board area. |
| Quiescent Current | 40µA (typ) in PSM mode - extends battery runtime in standby/sleep states of handheld and IoT endpoints. |
| Feedback Reference | 0.6V internal reference - provides accurate output scaling and simplifies adjustable versions via R1/R2 divider. |
| Shutdown Current | <0.1µA - isolates input from output during system off-state, preventing battery drain over long storage periods. |
Pinout & Package
Supplied in a 5-pin TSOT25 (SOT-25) surface-mount package with exposed thermal pad (1.9mm × 1.9mm), optimized for thermal performance in thin-profile portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 2.5–5.5V; connects directly to input capacitor to minimize high-frequency switching noise coupling. |
| GND | Power ground | Common return for input/output paths and IC substrate; must be tied to thermal pad for optimal heat dissipation. |
| EN | Enable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) disables output and reduces supply current to <0.1µA. |
| VOUT/FB | Output voltage sense / feedback | Internally connected to 0.6V error amplifier reference; for fixed 3.3V version, this pin is internally routed to output node. |
| SW | Switch node | Drain connection of internal PMOS/NMOS power stage; requires low-inductance routing to inductor and minimal loop area with GND. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated PMOS high-side + NMOS low-side switches eliminate external Schottky loss, enabling >96% peak efficiency at 1A. |
| Soft-start circuitry | Digital-controlled ramp limits inrush current during startup, preventing input voltage sag and output overshoot. |
| Under-voltage lockout (UVLO) | Activates below ~2.3V VIN to prevent operation with deeply discharged batteries, protecting cell longevity. |
| Thermal shutdown | Halts switching at 150°C junction temperature and resumes only after cooling to 120°C, ensuring safe fault recovery. |
| Short-circuit protection | Cycle-by-cycle peak current limit of 1.5A prevents damage during output faults; enters 400kHz low-duty cycle mode. |
Applications
| Wireless Headset Power Rail | USB-C Peripheral Regulator |
|---|---|
|
Use Scenario: Powers Bluetooth audio SoC and MEMS microphone in compact wireless earbuds with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying core logic and analog blocks; operates in PSM mode during audio pause intervals. Use Value: 40µA quiescent current extends standby time beyond 72 hours; 1.5MHz switching avoids interference with 2.4GHz BT radio band. |
Use Scenario: Generates stable 3.3V rail for USB-C controller, level shifters, and status LEDs in portable docking adapters. IC Role / Device Role / Timing Role: Input-supervised DC-DC converter accepting 5V USB-C VBUS; EN pin synchronized to USB enumeration handshake. Use Value: UVLO prevents erratic behavior during unstable USB negotiation; TSOT25 footprint fits tight 10mm × 10mm PCB real estate. |
| Digital Camera Sensor Bias | Smart Wearable MCU Supply |
|
Use Scenario: Supplies clean 3.3V to CMOS image sensor and ISP in ultra-thin action cameras powered by 3.7V Li-Po. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with low output ripple; SW node isolated from sensor analog ground plane. Use Value: 96% efficiency minimizes thermal impact on optical module; 0.6V FB reference allows future revision to 2.8V without layout change. |
Use Scenario: Powers ARM Cortex-M0+ MCU, BLE radio, and OLED display in fitness tracker with 120mAh coin-cell-equivalent battery. IC Role / Device Role / Timing Role: Always-on power manager enabling rapid wake-from-sleep transitions; EN controlled by RTC alarm signal. Use Value: Sub-0.1µA shutdown current preserves battery charge during multi-week storage; thermal shutdown protects polymer cell under sustained load. |
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 |
|---|---|---|---|
| AP63202WU-7 | 2A rated, 2.5–5.5V input, 3.3V fixed, 1.2MHz switching, no PSM mode - higher IQ (75µA) | Supports higher-current peripherals (e.g., Wi-Fi modules); less suitable for ultra-low-power sleep modes | Select when output current demand exceeds 1A or when board layout accommodates larger DFN package. |
| TPS62231DRYR | 1A, 2.05–6.0V input, 3.3V fixed, 3.6MHz switching, 17µA IQ - uses external compensation, smaller 2x2 DFN | Better transient response for burst-mode processors; higher fSW demands tighter layout but reduces inductor size | Prefer when fast load-step response is critical and PCB space allows 2x2 DFN; verify thermal margin at full load. |
Compared with AP63202WU-7 and TPS62231DRYR, the PAM2305AAB330 offers superior light-load efficiency via PSM and proven TSOT25 thermal reliability in cost-sensitive portable designs, while trading off maximum current headroom and ultra-high-frequency transient capability.
Availability
PAM2305AAB330 is available at Aetrix Electronics and suitable for cellular phone power management, portable medical sensors, and wireless IoT endpoint designs requiring stable component supply across production lifecycles.
Supply support for PAM2305AAB330 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 power management, signal integrity, and protection solutions for high-volume consumer and industrial markets.
The PAM2305 belongs to Diodes' high-efficiency DC-DC converter product line, engineered specifically for battery-operated portable electronics where size, efficiency, and reliability under variable load conditions are critical.
FAQ
What is the recommended inductor value for PAM2305AAB330 in a 3.3V output application?
For the fixed 3.3V output version operating from typical 3.6V–5.0V inputs, Diodes recommends a 4.7µH shielded power inductor with ≥1.4A saturation current and low DC resistance. This value balances ripple current (~400mA), efficiency, and physical size-verified in the datasheet's Table 1 and Application Information section.
Does PAM2305AAB330 require external feedback resistors?
No. The "AAB330" suffix denotes factory-trimmed 3.3V output, with internal resistor divider connected to the FB node. External resistors are unnecessary and must not be added; doing so would disrupt regulation accuracy and potentially cause instability.
How does the enable (EN) pin behave during power-up sequencing?
The EN pin has a 1.5V threshold high and 0.3V threshold low, with ±0.01µA leakage. When VIN rises above UVLO (~2.3V), the device remains disabled until EN exceeds 1.5V. This allows controlled power-rail activation synchronized to system reset or host processor GPIO.
Can PAM2305AAB330 operate in dropout mode, and what is the minimum input voltage for 3.3V output?
Yes-it supports 100% duty cycle operation down to VIN ≈ VOUT + IOUT × RDS(ON). With 0.45Ω PMOS RDS(ON) and 1A load, minimum VIN is ~3.75V for regulated 3.3V output. Below that, output drops linearly per VOUT = VIN − ILOAD × RDS(ON).
PAM2305AAB330 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):
- 3.3V
- 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
PAM2305AAB330 FAQ
1.How can I place an order for PAM2305AAB330 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2305AAB330 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 PAM2305AAB330 reliable?
The price and inventory of PAM2305AAB330 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2305AAB330 is usually 5 days.
3.What payment methods are accepted for PAM2305AAB330?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2305AAB330 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2305AAB330?
PAM2305AAB330 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2305AAB330 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 PAM2305AAB330?
For technical support, including PAM2305AAB330 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2305AAB330 requirements.
6.How does Aetrix verify that PAM2305AAB330 is sourced from the original manufacturer or authorized distributors?
All PAM2305AAB330 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 PAM2305AAB330 meets industry standards.
7.What is the process for return or replacement of PAM2305AAB330?
All PAM2305AAB330 units undergo pre-shipment inspection (PSI). If there is an issue with PAM2305AAB330, 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 PAM2305AAB330 part is unused and in its original packaging.
Return procedure for PAM2305AAB330:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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