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Diodes Incorporated PAM2305AABADJ
- Part No.:
- PAM2305AABADJ
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
PAM2305AABADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:7,635
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Product details
Overview
PAM2305AABADJ from Diodes Incorporated is a current-mode, synchronous step-down DC-DC converter optimized for battery-powered portable electronics. It operates from 2.5V to 5.5V input, delivers up to 1A output current, features 1.5MHz fixed-frequency PWM and pulse-skipping mode, and supports adjustable output voltage (0.6V–VIN) via external resistor divider. Used in cellular phones and wireless devices where efficiency and low quiescent current are critical.
For engineers reviewing the PAM2305AABADJ datasheet, PAM2305AABADJ pinout, PAM2305AABADJ application, or PAM2305AABADJ equivalent, key selection criteria include its 40µA typical quiescent current, 0.6V feedback reference, internal 0.3Ω/0.35Ω P/N-MOSFETs, thermal shutdown at 150°C, and TSOT25 package compatibility with space-constrained PCB layouts.
Technical Context
The PAM2305AABADJ employs current-mode control with internal synchronous rectification, enabling high efficiency (up to 96%) and stable transient response across load and line variations. Its dual-mode operation-PWM at heavy loads and PSM at light loads-minimizes power loss while maintaining regulation.
It integrates under-voltage lockout (UVLO), soft-start, cycle-by-cycle overcurrent protection (1.5A peak), and thermal shutdown (150°C trip, 30°C hysteresis). The 0.6V internal reference enables precise output setting via external resistors, and the SW node connects directly to internal MOSFET drains for minimal external component count.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single Li+/Li-Po cell, USB, or multi-cell alkaline/NiMH sources without external regulators. |
| Output Voltage Range | Adjustable from 0.6V to VIN - set via external resistor divider; 0.6V feedback reference enables accurate low-VOUT designs. |
| Max Output Current | 1A continuous - limited by thermal performance in TSOT25 package (PD ≤ 400mW at TA = 25°C). |
| Quiescent Current | 40µA typical - enables >100-hour standby in battery-powered devices with light-load PSM operation. |
| Switching Frequency | 1.5MHz nominal - allows use of small 2.2µH–4.7µH inductors and ceramic capacitors for compact, low-ripple designs. |
| Feedback Reference | 0.6V ±2% - defines output accuracy; combined with resistor tolerance, yields ±3% regulated output voltage. |
| Shutdown Current | <0.1µA - disconnects input from output during EN = low, preserving battery charge in off-state. |
Pinout & Package
Package: TSOT25 (5-pin, 2.9mm × 1.6mm × 0.9mm, exposed pad), RoHS-compliant, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power supply input | Accepts 2.5–5.5V; must be decoupled with low-ESR ceramic capacitor placed adjacent to pin. |
| GND | Power ground reference | Common return path for input/output currents; connects to exposed thermal pad for heat dissipation. |
| EN | Enable control input | Active-high logic: ≥1.5V enables regulator; ≤0.3V disables it and reduces IQ to <0.1µA. |
| VOUT/FB | Feedback voltage input | Senses output via resistor divider; internal 0.6V reference sets regulation point; requires direct routing to minimize noise. |
| SW | Switch node | Drain connection of internal P- and N-MOSFETs; high di/dt node requiring short, wide trace and separation from sensitive analog nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode; reduces conduction loss with 0.3Ω (P-MOS) and 0.35Ω (N-MOS) RDS(ON), improving efficiency at medium-to-heavy loads. |
| Pulse-Skipping Modulation (PSM) | Reduces switching frequency under light load to maintain >85% efficiency at 1mA output, extending battery life in idle/sleep states. |
| Soft-Start Function | Digitally ramps switch current in steps to limit inrush; prevents input voltage sag and output overshoot during startup. |
| Thermal Shutdown Protection | Shuts down at TJ = 150°C and resumes at TJ ≤ 120°C; protects against sustained overload or poor PCB thermal design. |
| Short-Circuit Recovery | Enters 400kHz low-duty-cycle mode during output short; limits average input current to ~200mA, enabling safe auto-recovery. |
Applications
| Cellular Phone Power Rail | Wireless Headset Core Supply |
|---|---|
|
Use Scenario: Powers baseband processor core voltage (1.2V–1.8V) from single Li-ion cell in smartphones. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable, low-noise Vcore with fast load-transient response during CPU burst activity. Use Value: 96% peak efficiency and 40µA quiescent current extend talk time and standby duration without compromising dynamic performance. |
Use Scenario: Supplies 3.3V or adjustable rail to Bluetooth SoC and audio codec in compact wireless headsets. IC Role / Device Role / Timing Role: Compact, low-thermal-footprint DC-DC converter enabling full-feature audio operation within tight battery and board-area constraints. Use Value: TSOT25 package and integrated MOSFETs reduce BOM count by 4 components versus discrete solutions, accelerating layout and validation. |
| Digital Camera Sensor Bias | Portable Medical Monitor Display |
|
Use Scenario: Generates clean 2.5V or 2.8V bias for CMOS image sensor analog front-end in pocket-sized cameras. IC Role / Device Role / Timing Role: Low-noise, high-PSRR step-down regulator isolating sensitive analog circuitry from noisy digital domains. Use Value: 1.5MHz switching frequency places ripple beyond audio band; ceramic input/output caps suppress EMI without ferrite beads. |
Use Scenario: Provides regulated 1.5V or 1.8V supply to LCD driver IC in handheld patient monitors operating on AA batteries. IC Role / Device Role / Timing Role: Battery-life-optimized buck converter with UVLO and thermal protection ensuring reliable operation across temperature and aging conditions. Use Value: Under-voltage lockout prevents deep discharge of alkaline cells; shutdown current <0.1µA preserves battery capacity during device storage. |
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 |
|---|---|---|---|
| TPS62231DRYR (Texas Instruments) | 1.8V fixed output only; 2.05V–6.5V input; 3.6MHz switching; 17µA IQ; no PSM mode. | Requires external resistor network for adjustability; higher fSW demands smaller L/C but increases EMI filtering complexity. | Select when fixed 1.8V output suffices and ultra-low IQ dominates over flexibility. |
| RT8059GJ6 (Richtek) | Adjustable 0.6–5.5V output; 2.5–5.5V input; 1.5MHz; 35µA IQ; includes power-good flag. | PGOOD signal enables system sequencing; slightly lower RDS(ON) but larger DFN2x2-6 footprint than TSOT25. | Select when system-level power sequencing or tighter output tolerance (±1.5%) is required. |
Compared with TPS62231DRYR and RT8059GJ6, the PAM2305AABADJ offers broader input range, true adjustability without added components, and superior thermal performance per mm² in TSOT25-making it optimal for cost-sensitive, space-constrained portable designs prioritizing flexibility and battery longevity.
Availability
PAM2305AABADJ is available at Aetrix Electronics and suitable for cellular phone power rails, wireless headset core supplies, and portable medical monitor displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for PAM2305AABADJ 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, specializing in high-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.
The PAM2305 belongs to Diodes' PAM series of compact, high-efficiency DC-DC converters designed specifically for battery-powered portable electronics where size, efficiency, and low quiescent current are critical.
FAQ
What output voltage range does the PAM2305AABADJ support?
The PAM2305AABADJ supports an adjustable output voltage from 0.6V to the input voltage (VIN), set using an external resistor divider connected to the FB pin. Its internal 0.6V reference ensures accurate regulation across the full range, with typical output accuracy of ±3% under specified load and line conditions.
How does the PAM2305AABADJ manage efficiency at light loads?
The PAM2305AABADJ uses Pulse-Skipping Modulation (PSM) under light-load conditions, reducing switching frequency to maintain high efficiency (>85% at 1mA) while minimizing quiescent current to 40µA typical. This extends battery life in standby or intermittent-use applications without sacrificing regulation stability.
Which package does the PAM2305AABADJ use, and what are its thermal limitations?
The PAM2305AABADJ uses the TSOT25 package (5-pin, 2.9mm × 1.6mm), with a junction-to-ambient thermal resistance (θJA) of 250°C/W on a standard 2-layer board. At 25°C ambient, maximum continuous power dissipation is 400mW-limiting practical 1A output to moderate VIN–VOUT differentials and adequate PCB copper area.
Can the PAM2305AABADJ operate in dropout mode, and how is output regulated there?
Yes-the PAM2305AABADJ operates in 100% duty-cycle dropout mode when VIN approaches VOUT. In this state, output voltage equals VIN minus ILOAD × RDS(ON) of the internal P-MOSFET (0.3Ω typ), providing unregulated but low-loss pass-through behavior without shutdown, useful for brownout resilience in battery systems.
PAM2305AABADJ 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
PAM2305AABADJ FAQ
1.How can I place an order for PAM2305AABADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2305AABADJ 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 PAM2305AABADJ reliable?
The price and inventory of PAM2305AABADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2305AABADJ is usually 5 days.
3.What payment methods are accepted for PAM2305AABADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2305AABADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2305AABADJ?
PAM2305AABADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2305AABADJ 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 PAM2305AABADJ?
For technical support, including PAM2305AABADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2305AABADJ requirements.
6.How does Aetrix verify that PAM2305AABADJ is sourced from the original manufacturer or authorized distributors?
All PAM2305AABADJ 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 PAM2305AABADJ meets industry standards.
7.What is the process for return or replacement of PAM2305AABADJ?
All PAM2305AABADJ units undergo pre-shipment inspection (PSI). If there is an issue with PAM2305AABADJ, 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 PAM2305AABADJ part is unused and in its original packaging.
Return procedure for PAM2305AABADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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