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Diodes Incorporated PAM2325AGPADJ
- Part No.:
- PAM2325AGPADJ
- Manufacturer:
- Diodes Incorporated
- Package:
- 12-PowerWFQFN
- Datasheet:
-
PAM2325AGPADJ.pdf
- Description:
- IC REG BUCK ADJ 3.5A 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
PAM2325AGPADJ from Diodes Incorporated is a 3.5A synchronous step-down DC-DC converter with adjustable output (1.0V–4.0V), 1.2MHz switching frequency, and ultra-small QFN2x2-12 package. It delivers high efficiency across load range, supports 100% duty-cycle low-dropout operation, and features power-good indication and hiccup-mode short-circuit protection - ideal for space-constrained portable power rails in USB devices and handheld computers.
For engineers reviewing the PAM2325AGPADJ datasheet, PAM2325AGPADJ pinout, PAM2325AGPADJ application, or PAM2325AGPADJ equivalent, key selection criteria include input voltage range (2.5V–5.5V), no-load quiescent current (55µA), thermal shutdown threshold (150°C), and feedback reference voltage (0.60V).
Technical Context
The PAM2325AGPADJ integrates matched P- and N-channel MOSFETs with RDS(ON) of 40mΩ/30mΩ (typ), enabling high-efficiency buck conversion down to 1.0V output. Its adaptive pulse-skipping mode (PSM) optimizes light-load efficiency while maintaining PWM operation above 250mA load to suppress output ripple.
Internal soft-start limits inrush current; UVLO (2.5V ±150mV) prevents erratic startup; and the open-drain PG pin asserts high when FB voltage remains within ±10% of regulation. Thermal shutdown activates at 150°C with 30°C hysteresis, resuming operation at 120°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5A max - supports high-current SoC or PMIC rails without external boost stages |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion, USB 5V, and regulated 3.3V supplies |
| Adjustable Output | 1.0V to 4.0V via resistor divider on FB pin - enables precise core voltage tuning for processors and FPGAs |
| Quiescent Current | 55µA at no load - extends battery life in always-on subsystems like USB-C PD controllers |
| Switching Frequency | 1.2MHz (±200kHz) - allows use of 1.0µH inductors and compact ceramic capacitors |
| Feedback Reference | 0.60V ±1.5% - sets output accuracy to ±4% over line/load/temperature |
| Thermal Shutdown | 150°C activation with 30°C hysteresis - protects IC and PCB during sustained overload or poor heatsinking |
Pinout & Package
Package: QFN2x2-12, 0.4mm pitch, exposed thermal pad (EP), RoHS/REACH compliant. Requires solder paste stencil opening for EP and controlled reflow profile per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10 PVIN/VIN | Power input for high-side switch and internal LDO | Internally connected - must be decoupled with ≥20µF X5R/X7R ceramic near pin 1 |
| 2, 11 SW | Switch node | Drives external inductor; requires low-inductance layout and Kelvin connection to minimize ringing |
| 3, 12 PGND | Power ground return for high-current paths | Must be tied directly to thermal pad and separated from AGND to avoid noise coupling into control loop |
| 4 AGND | Analog ground reference for error amplifier and bandgap | Connects only to FB, EN, PG, and external resistors - isolated from PGND except at single-point star ground |
| 5 NC | No connect | Must remain floating - no trace, no solder mask opening, no copper pour |
| 6 OUT | Output voltage sense | Direct connection to output capacitor anode - avoids IR drop errors in high-current paths |
| 7 FB | Feedback input | Resistor divider from OUT to AGND sets VOUT = 0.6V × (1 + R1/R2); tolerances affect regulation accuracy |
| 8 EN | Enable control | Active-high logic; 1.2V threshold ensures compatibility with 1.8V/3.3V GPIO; 1.2µA input current minimizes leakage impact |
| 9 PG | Power-good indicator | Open-drain output pulled up to VIN; asserts high only when VFB is within ±10% of 0.6V - used for sequencing or fault monitoring |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables dropout <100mV at 3.5A by fully enhancing P-MOSFET - critical for Li-ion to 3.3V or 2.8V rails |
| Hiccup-mode short-circuit protection | 6-bit counter (if VFB >0.2V) limits fault energy during sustained shorts - reduces thermal stress vs. latch-off |
| Internal soft-start | 250–1000µs ramp time prevents input voltage sag and output overshoot during cold start |
| Low-RDS(ON) integrated MOSFETs | 40mΩ (P-ch) / 30mΩ (N-ch) typical - achieves >85% efficiency at 1A/1.2V out from 3.3V input |
| Ultra-low shutdown current | 1µA - enables full-system deep-sleep states without compromising battery hold-up time |
Applications
| USB-C Power Delivery Sink | Digital Camera Image Sensor Bias |
|---|---|
|
Use Scenario: Regulating 5V USB-C input to 1.8V/3.3V for USB controller, Type-C port manager, and sideband use (SBU) circuitry. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable, low-noise power with fast transient response to handle burst data transfers. Use Value: 55µA quiescent current extends standby time; PG signal enables safe enumeration before host communication begins. |
Use Scenario: Supplying clean, adjustable bias to CMOS image sensor analog front-end (AFE) and ADC reference circuits. IC Role / Device Role / Timing Role: Precision point-of-load regulator with tight output accuracy (±4%) and low ripple (<2% at 300mA) to preserve SNR. Use Value: 1.2MHz switching avoids interference in visible-light and NIR bands; 100% duty cycle maintains regulation as battery discharges. |
| Portable Media Player Audio Codec | Wireless Network Card RF Front-End |
|
Use Scenario: Generating 1.2V core supply for audio DSP and 3.3V I/O rail for SD card interface in MP3 players. IC Role / Device Role / Timing Role: Dual-rail power source with independent enable control and coordinated PG signaling for power sequencing. Use Value: QFN2x2-12 footprint saves board area; low EMI design minimizes coupling into sensitive audio paths. |
Use Scenario: Providing 2.5V/3.3V bias to WLAN/BT transceiver ICs and PA drivers in mini-PCIe or M.2 wireless cards. IC Role / Device Role / Timing Role: High-transient-response regulator handling rapid TX/RX current spikes (up to 3.5A peak). Use Value: Excellent load transient response (<12% pk-pk deviation at 2A step) prevents RF desense during packet transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2158GQZ-P | 2.5A max output, 2.2MHz fSW, 2.5V–5.5V input, fixed 1.2V/1.8V/3.3V options only | Lacks adjustable output and PG pin; smaller solution size but lower current capability | Select when fixed-output rails and minimal BOM count outweigh need for flexibility and sequencing signals |
| TPS62865ARGRR | 4A max output, 2.5V–5.5V input, 1.8V–3.3V adjustable via I²C, 1.8MHz fSW, integrated compensation | Requires digital interface; higher cost; superior light-load efficiency but larger QFN3x3-16 package | Select when system-level programmability and tighter output tolerance (±0.5%) justify added complexity and footprint |
Compared with MP2158GQZ-P and TPS62865ARGRR, the PAM2325AGPADJ offers the best balance of adjustable output, 3.5A capability, ultra-compact QFN2x2-12 packaging, and analog-friendly features (PG, EN, FB) - making it optimal for cost-sensitive, space-constrained portable designs requiring analog control and sequencing.
Availability
PAM2325AGPADJ is available at Aetrix Electronics and suitable for USB devices, portable media players, digital cameras, and wireless network cards requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for PAM2325AGPADJ 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 power management ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in certified facilities worldwide.
The PAM2325 belongs to Diodes' Power Management product line, engineered specifically for high-efficiency, small-footprint DC-DC conversion in battery-powered consumer electronics - emphasizing low IQ, fast transient response, and robust protection.
FAQ
What is the minimum recommended output capacitance for stable operation?
The PAM2325AGPADJ requires ≥20µF total output capacitance using X5R/X7R ceramic capacitors. Lower values risk instability and excessive output ripple, especially under dynamic loads. The datasheet specifies 20µF as the baseline for all electrical characteristics, including transient response and efficiency measurements.
Can the PAM2325AGPADJ operate with input voltage equal to the desired output voltage?
Yes - the device supports 100% duty-cycle operation, allowing VIN = VOUT (minus RDS(ON) × ILOAD). At 3.5A and 40mΩ RDS(ON), dropout is ~140mV. This enables regulation down to battery end-of-discharge voltages without external LDO post-regulation.
How does the hiccup-mode protection behave during sustained overload?
Under continuous overload, the PAM2325AGPADJ enters hiccup mode after six consecutive current-limit events (if VFB >0.2V). It then disables both MOSFETs for ~588ms (1.7% duty cycle), then attempts soft-start again. This cycle repeats until fault clears, limiting average power dissipation and junction temperature rise.
Is the thermal pad (EP) electrically connected to any internal node?
No - the exposed thermal pad is internally unconnected and serves only for heat conduction. It must be soldered to a dedicated PCB thermal plane and tied to PGND externally for optimal thermal performance (θJA = 80°C/W on 2-layer JEDEC board).
PAM2325AGPADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 12-PowerWFQFN
- 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):
- 1V
- Voltage - Output (Max):
- 4V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-QFN (2x2)
PAM2325AGPADJ FAQ
1.How can I place an order for PAM2325AGPADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2325AGPADJ 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 PAM2325AGPADJ reliable?
The price and inventory of PAM2325AGPADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2325AGPADJ is usually 5 days.
3.What payment methods are accepted for PAM2325AGPADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2325AGPADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2325AGPADJ?
PAM2325AGPADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2325AGPADJ 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 PAM2325AGPADJ?
For technical support, including PAM2325AGPADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2325AGPADJ requirements.
6.How does Aetrix verify that PAM2325AGPADJ is sourced from the original manufacturer or authorized distributors?
All PAM2325AGPADJ 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 PAM2325AGPADJ meets industry standards.
7.What is the process for return or replacement of PAM2325AGPADJ?
All PAM2325AGPADJ units undergo pre-shipment inspection (PSI). If there is an issue with PAM2325AGPADJ, 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 PAM2325AGPADJ part is unused and in its original packaging.
Return procedure for PAM2325AGPADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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