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Diodes Incorporated PAM2312AABADJ
- Part No.:
- PAM2312AABADJ
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
PAM2312AABADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:6,983
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Product details
Overview
PAM2312AABADJ from Diodes Incorporated is a 1A synchronous step-down DC-DC converter with current-mode PWM/PSM control, internal 0.3Ω P-MOSFET and 0.35Ω N-MOSFET, 1.5MHz fixed switching frequency, and adjustable output (0.6V–VIN). It delivers up to 96% efficiency in portable electronics powered by single Li+/Li-polymer or USB sources.
For engineers reviewing the PAM2312AABADJ datasheet, PAM2312AABADJ pinout, PAM2312AABADJ application, or PAM2312AABADJ equivalent, key selection criteria include its 40µA quiescent current in PSM mode, 0.6V feedback reference, TSOT25 thermal resistance (θJA = 250°C/W), and EN pin logic thresholds (1.5V high / 0.3V low).
Technical Context
The PAM2312AABADJ employs peak-current-mode control with internal compensation, enabling stable regulation across 2.5V–5.5V input and load steps up to 1A. Its dual-mode operation-PWM at heavy loads and pulse-skipping modulation (PSM) under light loads-maintains high efficiency across wide load ranges.
It integrates synchronous rectification, soft-start (digital stepped current limit), cycle-by-cycle overcurrent protection (1.5A peak), and thermal shutdown triggered at +150°C with +30°C hysteresis. UVLO disables operation below ~2.3V to prevent deep battery discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li+/Li-Po, USB 5V, or 2–3 Alkaline/NiMH cells without external LDO pre-regulation. |
| Output Voltage Range | 0.6V to VIN - adjustable via external resistor divider; 0.6V internal reference enables precise low-VOUT rails for modern SoCs and MCUs. |
| Max Output Current | 1A continuous - limited by thermal dissipation in TSOT25 package (PD ≤ 400mW at TA = 25°C). |
| Quiescent Current | 40µA (typ.) - enables >100-hour standby in battery-powered devices with light-load PSM operation. |
| Feedback Reference | 0.6V ±2% - sets output accuracy; line/load regulation ≤0.5%/V and ≤1.5% ensures stable rail under dynamic conditions. |
| Switching Frequency | 1.5MHz (±20%) - allows compact 2.2–4.7µH inductors and ceramic capacitors; reduces EMI filtering burden. |
| EN Threshold | VH = 1.5V, VL = 0.3V - compatible with standard GPIOs and logic-level enable signals without level-shifting. |
Pinout & Package
Supplied in a 5-pin TSOT25 (2.9mm × 1.6mm × 0.6mm) package with exposed thermal pad (not electrically connected), optimized for high-density portable PCB layouts and thermal performance on 2-layer boards (θJA = 250°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high digital enable; <0.3V disables IC and reduces input-to-output leakage to <1µA. |
| 2 - GND | Power and signal ground reference | Common return path for VIN, SW, FB, and internal regulators; must be low-impedance and adjacent to CIN/COUT (-) plates. |
| 3 - SW | Switch node | Drain connection of internal P- and N-MOSFETs; high dv/dt node requiring short, wide trace routing away from sensitive analog nodes (e.g., FB). |
| 4 - VIN | Main power input | Accepts 2.5–5.5V; requires local 10µF ceramic capacitor placed as close as possible to minimize input ripple and EMI. |
| 5 - VOUT/FB | Output voltage feedback | Combines output sensing and feedback; connects to resistor divider midpoint; internal 0.6V reference enables accurate VOUT setting. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.3Ω P-MOSFET and 0.35Ω N-MOSFET eliminate external diode losses, enabling >90% efficiency even at 0.3A load. |
| Pulse-skipping modulation (PSM) | Reduces IQ to 40µA at light loads, extending battery life in always-on sensors and BLE peripherals without compromising transient response. |
| Soft-start circuit | Digital stepped current ramp limits inrush, preventing input voltage sag and output overshoot during power-up with no external components required. |
| Over-temperature protection | Shuts down at TJ = +150°C and auto-restarts at +120°C, protecting against sustained overload or poor heatsinking in sealed enclosures. |
| Short-circuit protection | Cycle-by-cycle current limiting (1.5A peak) and 500kHz fallback frequency limit fault energy, allowing safe recovery without latch-off. |
Applications
| Wireless Headset Power Rail | USB-C Peripheral Voltage Regulation |
|---|---|
|
Use Scenario: Regulating 3.3V from 5V USB-C input for Bluetooth audio codec and MEMS microphone in compact earbuds. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, low-noise 3.3V with fast load-step response to handle burst transmit currents. Use Value: 96% efficiency and 40µA quiescent current extend playback time; TSOT25 footprint fits tight acoustic cavity layouts. |
Use Scenario: Generating 1.8V core supply for USB-C controller and PD communication PHY in portable dongles. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 1.8V using 200k/100k resistor divider, referenced to 0.6V internal bandgap. Use Value: 1.5MHz switching enables use of 2.2µH inductor and 10µF X5R ceramics, minimizing solution size while meeting USB IF EMI limits. |
| Smart Scale Battery Management | Industrial Sensor Node DC-DC Stage |
|
Use Scenario: Converting 3.0V from two alkaline cells to stable 2.5V for precision ADC and load cell amplifier in battery-operated weighing systems. IC Role / Device Role / Timing Role: High-accuracy buck regulator maintaining ±3% output tolerance across temperature and battery discharge curve (2.5–3.0V VIN). Use Value: UVLO prevents deep discharge below 2.3V; PSM mode extends shelf life beyond 12 months with <1µA shutdown current. |
Use Scenario: Providing 3.3V from 4.2V Li-ion battery to LoRaWAN transceiver and microcontroller in remote environmental monitors. IC Role / Device Role / Timing Role: Synchronous buck converter operating in PWM mode during transmission bursts and PSM during 10-second sleep intervals. Use Value: 1A capability supports 300mA peak LoRa transmit current; thermal shutdown protects against enclosure overheating in solar-radiated enclosures. |
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 | Higher 2MHz switching frequency; lower 25µA IQ; but only 0.6A rated output and no PSM mode. | Better for ultra-compact space-constrained designs needing faster transient response, but unsuitable for 1A continuous loads. | Select MP2158 if board area is critical and max load ≤600mA; avoid when full 1A capability or PSM battery longevity is required. |
| TPS62231DRYT | Lower 17µA IQ and integrated soft-start; but uses external MOSFETs, requiring more BOM count and larger layout. | Preferred where ultra-low IQ dominates design priority and PCB area is less constrained than component count. | Choose TPS62231 for longest battery life in sub-100µA average-load applications; reject when minimizing external components is mandatory. |
Compared with MP2158GQZ-P and TPS62231DRYT, the PAM2312AABADJ uniquely balances 1A output, 40µA PSM IQ, fully integrated synchronous FETs, and TSOT25 footprint-making it optimal for cost-sensitive, space-limited portable devices requiring robust light-to-heavy load efficiency.
Availability
PAM2312AABADJ is available at Aetrix Electronics and suitable for wireless headset power rails, USB-C peripheral voltage regulation, smart scale battery management, and industrial sensor node DC-DC stages requiring stable component supply and long-term lifecycle support.
Supply support for PAM2312AABADJ 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 and manufacturing facilities across Asia and the Americas.
The PAM2312 belongs to Diodes' Power Management portfolio, designed specifically for high-efficiency, small-footprint DC-DC conversion in battery-powered consumer and industrial edge devices.
FAQ
What is the minimum recommended output capacitor for stable operation?
The datasheet specifies 10µF ceramic (X5R/X7R) for COUT with low ESR. Using <10µF risks violating output ripple requirements (ΔVOUT ≈ (ΔIL × ESR) + (ΔIL / (8 × f × COUT))) and may cause instability under 1A load steps. Larger values improve transient response but require verifying DC bias derating for voltage rating.
Can the PAM2312AABADJ operate in 100% duty cycle dropout mode?
Yes-it sustains regulation when VIN approaches VOUT by holding the P-MOSFET fully on. In this mode, VOUT = VIN − (IOUT × RDS(ON)_P), where RDS(ON)_P is 0.3Ω typical. Output accuracy degrades linearly with load current, making it suitable only for coarse rails like bias supplies-not precision analog domains.
How does the EN pin behave during power sequencing?
The EN pin has 1.5V turn-on and 0.3V turn-off thresholds with ±0.01µA leakage. It supports controlled power-up sequencing: asserting EN after VIN stabilizes prevents brown-out startup; pulling EN low before VIN collapse ensures clean shutdown with <1µA input isolation, avoiding backfeed into upstream sources.
Is the TSOT25 package thermally adequate for 1A continuous operation?
At TA = 25°C, maximum dissipation is 400mW (PD = (125°C − 25°C)/250°C/W). With typical losses of ~200mW at 1A/3.3V out, junction temperature stays ~75°C-well within the 125°C continuous limit. For ambient >60°C or poor airflow, reduce load current or add copper pour under the thermal pad per Diodes' layout guidelines.
PAM2312AABADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- TSOT-25
PAM2312AABADJ FAQ
1.How can I place an order for PAM2312AABADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2312AABADJ 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 PAM2312AABADJ reliable?
The price and inventory of PAM2312AABADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2312AABADJ is usually 5 days.
3.What payment methods are accepted for PAM2312AABADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2312AABADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2312AABADJ?
PAM2312AABADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2312AABADJ 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 PAM2312AABADJ?
For technical support, including PAM2312AABADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2312AABADJ requirements.
6.How does Aetrix verify that PAM2312AABADJ is sourced from the original manufacturer or authorized distributors?
All PAM2312AABADJ 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 PAM2312AABADJ meets industry standards.
7.What is the process for return or replacement of PAM2312AABADJ?
All PAM2312AABADJ units undergo pre-shipment inspection (PSI). If there is an issue with PAM2312AABADJ, 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 PAM2312AABADJ part is unused and in its original packaging.
Return procedure for PAM2312AABADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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