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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Diodes Incorporated PAM2301CAAB330

Name: PAM2301CAAB330
Brand: Diodes Incorporated
SKU: PAM2301CAAB330
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PAM2301CAAB330

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-5 Thin, TSOT-23-5

Datasheet:: PAM2301CAAB330.pdf

Description:: IC REG BUCK 3.3V 800MA TSOT25

Quantity:: RFQ Add To RFQ list

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Inventory:2,964

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Product details

Overview

PAM2301CAAB330 from Diodes Incorporated is a 800mA synchronous step-down DC-DC converter in TSOT25 package, delivering fixed 3.3V output from 2.5–5.5V input, featuring 1.5MHz switching frequency, 40μA quiescent current, and PSM/PWM dual-mode operation for portable battery-powered systems including wireless peripherals and digital frames.

For engineers reviewing the PAM2301CAAB330 datasheet, PAM2301CAAB330 pinout, PAM2301CAAB330 application, or PAM2301CAAB330 equivalent, key selection criteria include its 0.6V feedback reference, internal MOSFETs, 96% peak efficiency, UVLO threshold at ~2.5V, and thermal shutdown at +150°C - all critical for low-power, space-constrained designs.

Technical Context

The PAM2301CAAB330 uses current-mode PWM control with pulse-skipping modulation (PSM) to maintain regulation across load currents from 1mA to 800mA while minimizing quiescent power. Its 0.6V internal reference enables precise output voltage setting via external resistive divider or factory-trimmed 3.3V configuration.

It integrates complementary P- and N-channel MOSFETs with R_DS(ON) of 0.30Ω/0.35Ω (typ), supports 100% duty cycle operation near V_IN ≈ V_OUT, and includes cycle-by-cycle peak current limiting (~1.5A), soft-start, and thermal shutdown with 30°C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V - eliminates external feedback resistor network, reduces BOM count and layout sensitivity.
Max Output Current	800mA - sufficient to power microcontrollers, RF modules, and sensors in compact portable devices.
Input Voltage Range	2.5V to 5.5V - compatible with single Li+/Li-Po cells, USB 5V, and multi-cell alkaline/NiMH sources.
Switching Frequency	1.5MHz (typ) - enables use of small 2.2–4.7μH inductors and ceramic capacitors for minimal footprint.
Quiescent Current	40μA (typ) - extends battery runtime in standby or light-load states without sacrificing regulation.
Efficiency	Up to 96% - minimizes thermal dissipation in sealed enclosures and improves energy utilization.
Feedback Reference	0.6V - provides stable voltage reference for accurate output regulation and predictable divider design.
Shutdown Current	<0.1μA - ensures negligible battery drain during system sleep or off-state.

Pinout & Package

Package: TSOT25 - 5-pin, 2.9mm × 2.8mm × 1.0mm surface-mount package with exposed thermal pad; optimized for high-density PCB layouts and thermal performance in portable applications.

Pin/Terminal	Circuit Role	Design Meaning
1 EN	Enable control input	Logic-high (>1.5V) enables regulator; logic-low (<0.3V) disables output and reduces supply current to <0.1μA.
2 GND	Power ground reference	Common return path for input, output, and internal circuitry; must be low-impedance and thermally coupled to PCB ground plane.
3 SW	Switch node	Drain connection of internal high-side P-MOSFET and low-side N-MOSFET; carries high di/dt square-wave current - requires short, wide trace routing.
4 VIN	Main power input	Accepts 2.5–5.5V input; requires local 10μF ceramic capacitor placed adjacent to pin to suppress switching transients.
5 VOUT/FB	Output voltage / feedback	Delivers regulated 3.3V output; also serves as FB pin with 0.6V internal reference - internally tied to fixed divider for this variant.

Key Features

Feature	Design Value
Synchronous rectification	Integrated P- and N-channel MOSFETs eliminate external Schottky diode, reducing conduction loss and improving efficiency above 20% load.
Pulse-skipping mode (PSM)	Automatically engages under light load to reduce switching frequency and quiescent current to 40μA, extending battery life in intermittent-use devices.
Internal soft-start	Gradually ramps output voltage over ~1ms to limit inrush current, preventing input rail collapse and eliminating overshoot during power-up.
Under-voltage lockout (UVLO)	Disables operation below ~2.5V input to prevent deep discharge of Li+ batteries and ensure stable startup behavior.
Thermal shutdown with hysteresis	Shuts down at +150°C junction temperature and re-enables only after cooling to +120°C, preventing thermal runaway in enclosed or high-ambient environments.

Applications

Wireless Peripherals

Digital Photo Frames

Use Scenario: Bluetooth keyboard/mouse operating from single AA/AAA alkaline cells with intermittent active periods.

IC Role / Device Role / Timing Role: Primary 3.3V power rail generator for MCU, radio, and LED indicators.

Use Value: 40μA quiescent current preserves battery life over months of standby; 1.5MHz switching allows ultra-compact 2.2μH inductor and 10μF ceramic caps.

Use Scenario: Battery-backed indoor digital frame with auto-brightness and Wi-Fi sync.

IC Role / Device Role / Timing Role: Main 3.3V supply for display controller, flash memory, and ESP32 SoC.

Use Value: Fixed 3.3V output eliminates external resistors and layout sensitivity; 96% efficiency minimizes heat buildup behind glass enclosure.

Portable Medical Sensors

USB-Powered Test Gadgets

Use Scenario: Handheld pulse oximeter using coin-cell or Li-Po battery with low-duty-cycle measurement cycles.

IC Role / Device Role / Timing Role: Stable 3.3V source for analog front-end, ADC, and BLE transceiver.

Use Value: UVLO prevents battery over-discharge below 2.5V; PSM mode maintains regulation down to 1mA load without voltage droop.

Use Scenario: Field-deployable USB-C powered signal analyzer dongle requiring clean 3.3V for FPGA I/O banks.

IC Role / Device Role / Timing Role: Input-to-output buck converter accepting 5V USB and delivering regulated 3.3V.

Use Value: 100% duty-cycle capability ensures full 5V→3.3V conversion without dropout; internal MOSFETs simplify compliance with USB power budget limits.

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
AP3418WU-7	Fixed 3.3V output, 600mA max, 2.5–5.5V input, 1.2MHz f_SW, no PSM mode - higher IQ (65μA typ).	Lacks pulse-skipping; less suitable for long-duration battery operation with variable load profiles.	Prefer when cost sensitivity outweighs light-load efficiency needs and 600mA suffices.
TPS62231DRYR	3.3V fixed, 600mA, 2.05–6.5V input, 3.6MHz f_SW, 17μA IQ, integrated soft-start and DVS support.	Higher switching frequency enables smaller passives but increases EMI risk; lower IQ benefits ultra-low-power sleep modes.	Choose when board space is extremely constrained and input can exceed 5.5V; verify EMI filtering requirements.

Compared with AP3418WU-7 and TPS62231DRYR, the PAM2301CAAB330 delivers higher output current (800mA vs. ≤600mA), superior light-load efficiency via PSM, and identical input range - making it optimal for compact, battery-critical applications where sustained 3.3V delivery under dynamic loads is essential.

Availability

PAM2301CAAB330 is available at Aetrix Electronics and suitable for wireless peripherals, digital photo frames, and portable medical sensors requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for PAM2301CAAB330 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with emphasis on power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

The PAM2301 belongs to Diodes' Power Management Linear & Switching Regulators product line, designed specifically for high-efficiency, low-quiescent-current DC-DC conversion in space- and battery-constrained portable electronics.

FAQ

What is the recommended input capacitor for PAM2301CAAB330?

A 10μF X5R/X7R ceramic capacitor placed within 2mm of the VIN and GND pins is recommended. Its low ESR handles RMS input ripple current up to 400mA and suppresses high-frequency switching noise. Use 0603 or 0805 case size with 6.3V or higher voltage rating to ensure capacitance stability under DC bias.

Does PAM2301CAAB330 require external feedback resistors?

No. The "330" suffix indicates factory-trimmed fixed 3.3V output; internal resistive divider sets V_FB = 0.6V, so external resistors are unnecessary. Pin 5 (VOUT/FB) functions solely as output terminal - do not connect external components unless modifying output voltage (which voids fixed-V_OUT guarantee).

How does the PAM2301CAAB330 behave during input voltage drop below UVLO?

When VIN falls below ~2.5V, the device disables switching, disconnects input from output via internal MOSFETs, and draws <0.1μA shutdown current. Output voltage decays only due to load and output capacitor discharge - no reverse current flows from VOUT to VIN, protecting upstream battery cells from over-discharge.

Can PAM2301CAAB330 drive a 3.3V LDO's input for additional noise filtering?

Yes - its 800mA output current and low output impedance support cascading into a low-noise LDO (e.g., AP2204K-3.3). This two-stage approach achieves <10μV_RMS noise for sensitive analog circuits, though efficiency drops ~5–10%. Ensure total output capacitance remains ≥10μF and thermal derating accounts for combined power dissipation.

PAM2301CAAB330 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:: 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

PAM2301CAAB330 FAQ

1.How can I place an order for PAM2301CAAB330 through Aetrix?

Please submit a Request for Quotation (RFQ) for PAM2301CAAB330 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 PAM2301CAAB330 reliable?

The price and inventory of PAM2301CAAB330 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2301CAAB330 is usually 5 days.

3.What payment methods are accepted for PAM2301CAAB330?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2301CAAB330 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PAM2301CAAB330?

PAM2301CAAB330 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PAM2301CAAB330 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 PAM2301CAAB330?

For technical support, including PAM2301CAAB330 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2301CAAB330 requirements.

6.How does Aetrix verify that PAM2301CAAB330 is sourced from the original manufacturer or authorized distributors?

All PAM2301CAAB330 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 PAM2301CAAB330 meets industry standards.

7.What is the process for return or replacement of PAM2301CAAB330?

All PAM2301CAAB330 units undergo pre-shipment inspection (PSI). If there is an issue with PAM2301CAAB330, 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 PAM2301CAAB330 part is unused and in its original packaging.

Return procedure for PAM2301CAAB330:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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