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

Diodes Incorporated PAM2305CGFADJ

Name: PAM2305CGFADJ
Brand: Diodes Incorporated
SKU: PAM2305CGFADJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PAM2305CGFADJ

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 6-WDFN Exposed Pad

Datasheet:: PAM2305CGFADJ.pdf

Description:: IC REG BUCK ADJ 1A 6DFN

Quantity:: RFQ Add To RFQ list

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Inventory:12,903

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Product details

Overview

PAM2305CGFADJ from Diodes Incorporated is a current-mode, synchronous step-down DC-DC converter with adjustable output voltage (0.6 V to VIN), 1 A continuous output current capability, 1.5 MHz fixed switching frequency, and 40 µA typical quiescent current in PSM mode-designed for battery-powered portable electronics requiring high efficiency across light-to-heavy load conditions.

For engineers reviewing the PAM2305CGFADJ datasheet, PAM2305CGFADJ pinout, PAM2305CGFADJ application, or PAM2305CGFADJ equivalent, key selection criteria include input voltage range (2.5–5.5 V), feedback reference voltage (0.6 V), thermal shutdown threshold (150 °C), EN logic thresholds (1.5 V high / 0.3 V low), and DFN2x2-6 package thermal resistance (θJA = 68 °C/W).

Technical Context

The PAM2305CGFADJ employs current-mode PWM control for stable regulation and fast transient response at full load, while automatically transitioning to pulse-skipping modulation (PSM) under light loads to maintain high efficiency and minimize quiescent current. Its internal synchronous rectifier eliminates external Schottky diode requirements.

It integrates dual MOSFET power switches (P-channel high-side, N-channel low-side), a 0.6 V precision bandgap reference, soft-start circuitry limiting inrush current, and cycle-by-cycle peak current limiting (1.5 A typical). UVLO prevents operation below 2.5 V input, and thermal shutdown disables switching above 150 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5 V to 5.5 V - supports single Li+/Li-Po cell, USB, or multi-cell alkaline/NiMH sources without external LDO pre-regulation.
Output Voltage Range	Adjustable from 0.6 V to VIN - enables custom rail generation via external resistor divider; FB pin references 0.6 V internal reference.
Max Output Current	1 A continuous - limited by thermal performance of DFN2x2-6 package (PD ≤ 980 mW at TA = 25 °C).
Switching Frequency	1.5 MHz (typ) - allows use of compact 2.2–4.7 µH inductors and ceramic capacitors for space-constrained PCB layouts.
Quiescent Current	40 µA (typ) in PSM mode - extends battery runtime in standby/sleep states of portable devices.
Feedback Reference	0.6 V ±2% - sets output accuracy; VO = 0.6 × (1 + R1/R2); enables ±3% output voltage tolerance over line/load/temperature.
EN Thresholds	V_EH = 1.5 V, V_EL = 0.3 V - provides robust enable/disable control compatible with 1.8 V/3.3 V GPIOs.
Shutdown Current	< 0.1 µA - isolates input from output during disable, preventing battery drain in powered-off systems.

Pinout & Package

Package: DFN2x2-6 (2.0 mm × 2.0 mm, 0.5 mm pitch, exposed thermal pad). Pin count: 6. Thermal resistance: θ_JA = 68 °C/W, θ_JC = 25 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Main power input	Accepts 2.5–5.5 V supply; connects to input capacitor (10 µF ceramic) near pin for low-impedance AC path to internal switches.
GND	Power ground	Common return for input/output paths and IC substrate; must be connected to exposed thermal pad for optimal heat dissipation.
EN	Enable control input	Active-high logic input; >1.5 V enables regulator, <0.3 V forces shutdown with <0.1 µA current draw.
VOUT/FB	Feedback node	Monitors output via resistor divider; internal 0.6 V reference compares against divided VO to regulate duty cycle.
SW	Switch node	Drain connection of internal P- and N-MOSFETs; drives external inductor; requires tight layout to minimize EMI and ringing.
NC	No connection	Pin 1 is unconnected; must not be soldered or tied to any net to avoid parasitic coupling or thermal interference.

Key Features

Feature	Design Value
Synchronous rectification	Integrated N-MOSFET replaces external Schottky diode, eliminating forward voltage drop and improving efficiency by up to 8% at 1 A.
PSM + PWM dual-mode operation	Automatically selects pulse-skipping (light load) or fixed-frequency PWM (heavy load) to maintain >85% efficiency from 1 mA to 1 A output current.
Internal soft-start	Gradually ramps switch current limit from zero to 1.5 A over ~1 ms, preventing input voltage sag and output overshoot during startup.
Comprehensive protection	Includes under-voltage lockout (UVLO), short-circuit foldback (400 kHz min frequency, 200 mA avg input), thermal shutdown (150 °C trip, 30 °C hysteresis), and cycle-by-cycle current limiting.
Low-noise design support	1.5 MHz switching frequency places fundamental noise beyond sensitive audio/RF bands; optional external synchronization not supported.

Applications

Wireless Headset Power Rail

Digital Camera Core Logic Supply

Use Scenario: Dual-rail power system in Bluetooth headset ICs requiring clean 1.2 V core and 3.3 V I/O from single Li-ion cell.

IC Role / Device Role / Timing Role: Primary step-down regulator generating adjustable 1.2 V core voltage with tight load-transient response for DSP wake-up events.

Use Value: 40 µA quiescent current extends standby time to >10 days; 1.5 MHz switching allows 2.2 µH inductor and 10 µF X5R ceramics in <3 mm² footprint.

Use Scenario: Powering image sensor interface and baseband processor in compact digital camera modules.

IC Role / Device Role / Timing Role: Adjustable-output buck converter delivering 1.8 V to CMOS image sensor analog block with <10 mV ripple.

Use Value: Synchronous rectification achieves 94% efficiency at 800 mA, reducing thermal load on 2-layer PCB; EN pin enables firmware-controlled power sequencing.

USB-Powered Portable Speaker

Smart Wearable Sensor Hub

Use Scenario: Regulating 5 V USB input to stable 3.3 V for audio DAC, Class-D amplifier, and Bluetooth SoC.

IC Role / Device Role / Timing Role: Main DC-DC converter operating in PWM mode during playback, switching to PSM during pause to conserve battery.

Use Value: 96% peak efficiency minimizes heat in sealed enclosure; DFN2x2-6 package fits beneath speaker driver PCB with direct thermal pad grounding.

Use Scenario: Powering ultra-low-power MCU, accelerometer, and BLE radio from coin-cell or small Li-Po in fitness tracker.

IC Role / Device Role / Timing Role: Adjustable buck supplying 1.5 V to MCU core and 2.8 V to BLE transceiver using single inductor with dual-output configuration.

Use Value: 0.6 V feedback reference enables precise low-voltage rails; shutdown current <0.1 µA preserves shelf life of pre-charged units for >2 years.

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
MP2158GQZ-P	Fixed 1.5 MHz frequency, 0.6 V reference, but only 0.6 A output rating and no PSM mode - higher IQ (65 µA) limits battery life.	Limited to sub-600 mA loads; lacks light-load efficiency optimization for always-on sensors.	Select when cost sensitivity outweighs efficiency needs and output current ≤ 600 mA.
TPS62231DRYR	Higher 3 MHz switching frequency, 0.6 V reference, 0.6 A rating, and integrated soft-start - but no thermal shutdown or UVLO.	Requires external thermal monitoring; unsuitable for unattended battery systems where overtemperature risk exists.	Prefer for space-constrained designs needing smallest inductor (1 µH), provided thermal management is handled externally.

Compared with MP2158GQZ-P and TPS62231DRYR, the PAM2305CGFADJ delivers 1 A output with true PSM operation and full protection suite in a thermally optimized DFN2x2-6 package - making it uniquely suited for compact, battery-critical portable systems demanding both peak efficiency and safety robustness.

Availability

PAM2305CGFADJ is available at Aetrix Electronics and suitable for wireless headsets, digital cameras, USB-powered speakers, and smart wearables requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PAM2305CGFADJ 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 centers across Asia and manufacturing facilities in China, Taiwan, and the U.S.

The PAM2305 belongs to Diodes' Power Management product line, engineered specifically for high-efficiency, low-quiescent-current DC-DC conversion in space- and battery-constrained portable electronics.

FAQ

What is the minimum recommended output capacitor value for stable operation?

The datasheet specifies 10 µF ceramic (X5R/X7R) for C_OUT with ≤10 mΩ ESR. Using less than 10 µF risks increased output ripple (>20 mV) and potential instability under transient load steps, especially at 1.5 MHz switching frequency where capacitor impedance dominates high-frequency filtering.

Can the PAM2305CGFADJ operate with an input voltage below 2.5 V?

No. The absolute minimum input voltage is 2.5 V per Recommended Operating Conditions. Below this, UVLO disables regulation; attempting operation risks erratic behavior, failure to start, or undefined output voltage due to insufficient gate drive for internal MOSFETs.

How does the NC pin (Pin 1) affect PCB layout or thermal performance?

Pin 1 is electrically unconnected and must remain floating - no trace, solder mask opening, or thermal relief should contact it. Connecting it risks parasitic coupling into SW or FB nodes, increasing EMI or causing regulation drift; its isolation preserves signal integrity and avoids compromising the exposed thermal pad's heat transfer path.

Is external compensation required for the feedback loop?

No. The PAM2305CGFADJ uses internal compensation optimized for standard 2.2–4.7 µH inductors and 10 µF ceramic capacitors. Adding external compensation components disrupts factory-tuned loop stability and may cause oscillation or poor transient response - the device is designed for "plug-and-play" operation with minimal external parts.

PAM2305CGFADJ Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 6-WDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.5V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 5.5V

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:: 6-DFN (2x2)

PAM2305CGFADJ FAQ

1.How can I place an order for PAM2305CGFADJ through Aetrix?

Please submit a Request for Quotation (RFQ) for PAM2305CGFADJ 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 PAM2305CGFADJ reliable?

The price and inventory of PAM2305CGFADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2305CGFADJ is usually 5 days.

3.What payment methods are accepted for PAM2305CGFADJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2305CGFADJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PAM2305CGFADJ?

PAM2305CGFADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PAM2305CGFADJ 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 PAM2305CGFADJ?

For technical support, including PAM2305CGFADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2305CGFADJ requirements.

6.How does Aetrix verify that PAM2305CGFADJ is sourced from the original manufacturer or authorized distributors?

All PAM2305CGFADJ 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 PAM2305CGFADJ meets industry standards.

7.What is the process for return or replacement of PAM2305CGFADJ?

All PAM2305CGFADJ units undergo pre-shipment inspection (PSI). If there is an issue with PAM2305CGFADJ, 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 PAM2305CGFADJ part is unused and in its original packaging.

Return procedure for PAM2305CGFADJ:

1.Submit a request within 90 days.

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

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