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

Diodes Incorporated PAM2321AYMADJ

Name: PAM2321AYMADJ
Brand: Diodes Incorporated
SKU: PAM2321AYMADJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PAM2321AYMADJ

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: -

Datasheet:: PAM2321AYMADJ.pdf

Description:: IC REG BUCK ADJ/1.2V 2A 10DFN

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Product details

Overview

PAM2321AYMADJ from Diodes Incorporated is a 2A synchronous step-down DC-DC converter with 3MHz fixed-frequency PWM/PSM operation, 2.7–5.5V input range, 1.2V fixed output, and integrated high-side P-MOSFET (130mΩ) and low-side N-MOSFET (90mΩ), designed for space-constrained portable power rails in USB devices and handheld computers.

For engineers reviewing the PAM2321AYMADJ datasheet, PAM2321AYMADJ pinout, PAM2321AYMADJ application, or PAM2321AYMADJ equivalent, key selection criteria include its 55µA no-load quiescent current, 100% duty-cycle dropout capability, thermal shutdown at 150°C, and TDFN3x3-10 package compatibility with 0.47µH inductors and ceramic capacitors.

Technical Context

The PAM2321AYMADJ uses a current-mode synchronous buck architecture with internal 0.6V reference and dual-MOSFET power stage. Its 3MHz oscillator enables sub-microhenry inductor use and supports both forced-PWM and automatic pulse-skipping mode (PSM) below 200mA load to maintain efficiency across 0–2A.

It integrates UVLO (2.7V rising threshold), internal soft-start (~200µs), over-current protection (3A typ), and thermal shutdown with 30°C hysteresis. Feedback is via FB pin tied directly to output for fixed 1.2V configuration, eliminating external resistors.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7V to 5.5V - supports single-cell Li-ion, USB 5V, and regulated 3.3V rails without external LDO pre-regulation.
Output Voltage	Fixed 1.2V ±3% - matches core voltage requirements of ARM Cortex-A/M series processors and LPDDR memory I/O.
Max Output Current	2A continuous - delivers full-rated load with <1.66W max dissipation on standard 2-layer PCB per θJA = 60°C/W.
Switching Frequency	3MHz - enables use of 0.47µH chip inductors and reduces output capacitor ESR dependency for ripple control.
No-Load Quiescent Current	55µA - extends battery runtime in standby states of portable media players and wireless network cards.
R_DS(ON)	P-MOSFET: 130mΩ / N-MOSFET: 90mΩ - minimizes conduction loss during 100% duty-cycle operation near V_IN = V_OUT.
Protection Features	Over-temperature (150°C trip), short-circuit hiccup mode, and EN-controlled <1µA shutdown - ensures robustness in unattended embedded systems.

Pinout & Package

Package: TDFN3x3-10 (3mm × 3mm, 0.75mm height, exposed thermal pad). RoHS-compliant, halogen-free, Pb-free.

Pin/Terminal	Circuit Role	Design Meaning
PGND	Main power ground return	Low-impedance path for high di/dt switching currents; must connect to input/output capacitor ground planes and EP.
PVIN	High-side MOSFET source supply	Connected to input capacitor anode; separates high-current PVIN path from logic VIN to reduce noise coupling.
VIN	Analog/Logic supply input	Powers internal bias circuitry; requires local 0.1µF decoupling to AGND for stable reference and error amplifier operation.
FB	Feedback node	Direct connection to 1.2V output (fixed version); sets regulation point via internal 0.6V reference; no external divider needed.
AGND	Analog ground reference	Internally isolated from PGND; must tie to VIN decoupling cap ground to prevent reference noise injection.
EN	Enable control input	Active-high logic interface (V_EH = 1.4V, V_EL = 0.4V); pulls <1µA in shutdown, enabling system-level power sequencing.
SW	Power switch node	Connects to inductor; carries full switching waveform (0 to V_IN); requires minimal loop area to limit EMI.
EP	Exposed thermal pad	Electrically connected to PGND; must be soldered to ≥4 thermal vias to inner ground plane for θ_JA ≤60°C/W performance.

Key Features

Feature	Design Value
3MHz constant-frequency PWM + PSM	Enables consistent EMI profile during heavy load and ultra-low IQ (<55µA) during light load without audible switching noise.
100% duty-cycle operation	Maintains regulation down to V_IN – V_OUT ≈ 130mΩ × I_LOAD, critical for Li-ion discharge tail-end support in portable devices.
Integrated dual-MOSFET power stage	Eliminates external FETs and gate drivers; reduces BOM count and layout complexity while optimizing R_DS(ON) matching.
Internal soft-start (200µs)	Prevents inrush current into output caps and avoids input rail droop during power-up in battery-powered systems.
Hiccup-mode short-circuit protection	Limits average power during fault to <30mW (1.7% duty cycle), preventing thermal runaway and enabling safe auto-recovery.

Applications

USB Peripheral Power Rail

Digital Camera Core Supply

Use Scenario: Powering USB 2.0/3.0 hubs, dongles, and OTG adapters from 5V bus or single-cell battery.

IC Role / Device Role / Timing Role: Primary 1.2V core regulator for USB PHY and microcontroller, operating in PSM during suspend states.

Use Value: 55µA quiescent current extends host battery life during USB enumeration idle periods; 3MHz switching avoids interference with USB 480Mbps signaling.

Use Scenario: Supplying image sensor and ISP core voltage in compact digital cameras with fast wake-from-sleep requirements.

IC Role / Device Role / Timing Role: High-transient-response buck converter delivering 2A peak during sensor readout bursts.

Use Value: Excellent load transient response (<10µs recovery) prevents image corruption; 0.47µH inductor enables <3mm² solution size.

Handheld Computer SoC Core

Wireless Network Card Voltage Rail

Use Scenario: Regulating 1.2V core voltage for ARM-based PDAs and industrial handhelds powered by 3.7V Li-ion.

IC Role / Device Role / Timing Role: Main SoC core supply with 100% duty-cycle support during battery voltage decay below 1.3V.

Use Value: Maintains stable 1.2V output down to 1.25V input (130mΩ × 2A = 260mV drop), extending usable battery capacity by >12%.

Use Scenario: Providing clean 1.2V supply to Wi-Fi/BT combo chips in mini-PCIe and M.2 modules.

IC Role / Device Role / Timing Role: Low-noise, high-efficiency power stage synchronized to host system power management signals via EN pin.

Use Value: <1µA shutdown current enables full module power gating; thermal pad ensures reliable operation at 70°C ambient in enclosed enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2143DJ-LF-Z (Monolithic Power)	2A, 2.5–5.5V input, adjustable 0.8–5.5V output; 2MHz switching; 75µA IQ; SOIC-8 package.	Requires external feedback resistors; larger footprint; higher IQ increases standby drain.	Select when adjustable output or SOIC-8 assembly compatibility is required; avoid for space-constrained 1.2V-only designs.
TPS62231DRYR (Texas Instruments)	2A, 2.05–6.5V input, fixed 1.2V output; 3.6MHz; 17µA IQ; 2mm×2mm DSBGA-8 package.	Lower IQ but smaller 2mm×2mm footprint; no exposed thermal pad; lower max current rating at high ambient.	Select for ultra-low-power wearables where <20µA IQ outweighs thermal derating needs; not recommended for sustained 2A loads above 60°C.

Compared with MP2143DJ-LF-Z and TPS62231DRYR, the PAM2321AYMADJ offers optimal balance of 3MHz frequency, 55µA IQ, integrated 1.2V setting, and TDFN3x3-10 thermal performance-making it preferred for thermally demanding 2A portable applications requiring minimal external components.

Availability

PAM2321AYMADJ is available at Aetrix Electronics and suitable for USB devices, digital cameras, handheld computers, and wireless network cards requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PAM2321AYMADJ 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The PAM2321 belongs to Diodes' Power Management product line, engineered specifically for high-efficiency, ultra-compact DC-DC conversion in battery-powered portable electronics with stringent size and quiescent current requirements.

FAQ

What is the recommended inductor value for PAM2321AYMADJ in a 1.2V/2A application?

The datasheet specifies 0.47µH as the typical inductor value for 1.2V output at 2A load with 3MHz switching. This value achieves ~800mA peak-to-peak ripple current (40% of 2A), balances efficiency and transient response, and fits within the TDFN3x3-10 footprint constraints. Inductors rated for ≥2.8A DC current and low DCR (e.g., TDK VLS201610 or Coilcraft XAL5030) are validated for stable operation.

Does PAM2321AYMADJ require external feedback resistors for 1.2V output?

No. The PAM2321AYMADJ is the fixed 1.2V output variant: the FB pin is internally connected to the output, eliminating external resistor dividers. This simplifies layout, improves accuracy (±3% over temperature), and removes resistor tolerance and thermal drift errors inherent in adjustable versions.

How does thermal management work with the exposed pad (EP) on the TDFN3x3-10 package?

The EP is electrically tied to PGND and serves as the primary thermal path. It must be soldered to a minimum 12mm² copper area on the PCB with ≥4 thermal vias (0.3mm diameter) connecting to an internal ground plane. This achieves the specified θ_JA = 60°C/W and allows 1.66W max power dissipation at 25°C ambient-critical for sustained 2A operation.

Can PAM2321AYMADJ operate with input voltage equal to output voltage?

Yes. Its 100% duty-cycle capability allows regulation down to V_IN = V_OUT + (I_LOAD × R_DS(ON)). At 2A load, it maintains 1.2V output with input as low as 1.2V + (2A × 0.13Ω) = 1.46V-enabling full utilization of Li-ion battery discharge down to 3.0V system input (after linear pre-regulator or direct cell connection).

PAM2321AYMADJ Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: *

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Packaging:: Tape & Reel (TR)

Product Status:: Active

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PAM2321AYMADJ FAQ

1.How can I place an order for PAM2321AYMADJ through Aetrix?

Please submit a Request for Quotation (RFQ) for PAM2321AYMADJ 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 PAM2321AYMADJ reliable?

The price and inventory of PAM2321AYMADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2321AYMADJ is usually 5 days.

3.What payment methods are accepted for PAM2321AYMADJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2321AYMADJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PAM2321AYMADJ?

PAM2321AYMADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PAM2321AYMADJ 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 PAM2321AYMADJ?

For technical support, including PAM2321AYMADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2321AYMADJ requirements.

6.How does Aetrix verify that PAM2321AYMADJ is sourced from the original manufacturer or authorized distributors?

All PAM2321AYMADJ 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 PAM2321AYMADJ meets industry standards.

7.What is the process for return or replacement of PAM2321AYMADJ?

All PAM2321AYMADJ units undergo pre-shipment inspection (PSI). If there is an issue with PAM2321AYMADJ, 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 PAM2321AYMADJ part is unused and in its original packaging.

Return procedure for PAM2321AYMADJ:

1.Submit a request within 90 days.

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

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