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Diodes Incorporated PAM2301CAAB120
- Part No.:
- PAM2301CAAB120
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
PAM2301CAAB120.pdf
- Description:
- IC REG BUCK 1.2V 800MA TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,933
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Product details
Overview
PAM2301CAAB120 from Diodes Incorporated is a 800mA synchronous step-down DC-DC converter in TSOT25 package, delivering fixed 1.2V output from 2.5–5.5V input. It employs current-mode PWM control with 1.5MHz switching frequency, Pulse-Skipping Modulation for <40μA quiescent current at light load, and integrated P/N-channel MOSFETs for >96% peak efficiency in portable battery-powered systems.
For engineers reviewing the PAM2301CAAB120 datasheet, PAM2301CAAB120 pinout, PAM2301CAAB120 application, or PAM2301CAAB120 equivalent, key selection criteria include its 1.2V fixed output, 0.6V feedback reference, EN-controlled shutdown (<0.1μA), thermal shutdown at +150°C, and TSOT25 footprint compatibility with space-constrained designs.
Technical Context
The PAM2301CAAB120 implements a current-mode control architecture with internal 0.6V reference and adjustable soft-start via external capacitor. Its 1.5MHz fixed-frequency PWM operation ensures stable regulation under dynamic load steps, while PSM mode automatically engages below ~10mA load to maintain high light-load efficiency.
It integrates both high-side P-MOSFET (RDS(ON) = 0.30Ω typ.) and low-side N-MOSFET (RDS(ON) = 0.35Ω typ.), eliminating external diode losses. UVLO triggers at ~2.3V (hysteresis included), and short-circuit protection limits peak switch current to 1.5A with 400kHz fallback mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V - eliminates external feedback resistors and reduces BOM count. |
| Input Voltage Range | 2.5V to 5.5V - supports single Li+/Li-Po cell, USB 5V, or 3× alkaline/NiMH batteries. |
| Max Output Current | 800mA - sufficient for microcontrollers, sensors, and RF transceivers in portable devices. |
| Switching Frequency | 1.5MHz (typ.) - enables use of small 2.2–4.7μH inductors and compact ceramic capacitors. |
| Quiescent Current | 40μA (typ.) - extends battery runtime in standby or low-power sleep modes. |
| Efficiency | Up to 96% - minimizes thermal dissipation in sealed enclosures and improves power density. |
| Shutdown Current | <0.1μA - preserves battery charge during long-term storage or system off-state. |
| Feedback Reference | 0.6V - sets precise output tolerance (±3%) and simplifies custom voltage design if used in adjustable variant. |
Pinout & Package
Package: TSOT25 (2.9mm × 2.8mm × 0.9mm, 5-pin leadless surface-mount). Thermal resistance θJA = 250°C/W; θJC = 130°C/W. RoHS-compliant, halogen- and antimony-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic: ≥1.5V enables regulator; ≤0.3V disables output and reduces IQ to <0.1μA. |
| 2 - GND | Power ground reference | Common return path for input, output, and internal circuitry; must be low-impedance plane. |
| 3 - SW | Switch node | Drain connection of internal P- and N-MOSFETs; carries high di/dt square wave; requires tight layout to minimize EMI. |
| 4 - VIN | Main power input | Accepts 2.5–5.5V; requires local 10μF ceramic capacitor placed adjacent to pin for high-frequency decoupling. |
| 5 - VOUT/FB | Output voltage / feedback | Delivers regulated 1.2V output; internally connected to 0.6V error amplifier reference - no external resistor divider needed. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P/N-MOSFETs eliminate Schottky loss, enabling >96% efficiency at medium loads without external diode. |
| Pulse-Skipping Modulation (PSM) | Automatically switches from PWM to PSM below ~10mA load, reducing IQ to 40μA and extending battery life in intermittent-use devices. |
| Thermal shutdown with hysteresis | Shuts down at +150°C junction temperature and restarts at +120°C, preventing thermal runaway in enclosed or high-ambient environments. |
| Soft-start | Digital-controlled ramp limits inrush current during startup, avoiding input rail collapse and output overshoot. |
| Short-circuit foldback | Under sustained short, switches to 400kHz min-duty cycle mode, limiting average input current to ~200mA for safe fault containment. |
Applications
| Wearable Health Monitor | Bluetooth Low Energy Module |
|---|---|
Use Scenario: Compact wrist-worn device powered by single Li-Po cell, requiring stable 1.2V supply for ultra-low-power MCU and optical sensor ICs. IC Role / Device Role / Timing Role: Primary power conversion stage delivering regulated 1.2V from 3.0–4.2V battery range with minimal quiescent draw during sleep cycles. Use Value: 40μA quiescent current and PSM mode extend battery life beyond 7 days between charges, while TSOT25 footprint fits sub-10mm² PCB area. | Use Scenario: Small-form-factor BLE beacon using coin-cell or rechargeable Li-Po, operating intermittently with deep-sleep periods. IC Role / Device Role / Timing Role: Efficient step-down regulator supplying 1.2V to BLE SoC's core logic domain, synchronized to wake-up events. Use Value: 1.5MHz switching allows use of 2.2μH inductor and 10μF X5R ceramics, achieving <15mVpp ripple and fast transient response to burst transmissions. |
| Smart Remote Control | Industrial Sensor Node |
Use Scenario: IR/RF remote powered by two AA alkaline cells (2.4–3.2V), needing clean 1.2V rail for microcontroller and IR LED driver. IC Role / Device Role / Timing Role: Input-voltage-agnostic buck converter maintaining regulation across full battery discharge curve. Use Value: UVLO prevents deep discharge below 2.3V, preserving cell longevity; 800mA capability supports brief high-current IR bursts without voltage sag. | Use Scenario: Battery-operated wireless temperature/humidity sensor deployed in factory environment (-40°C to +85°C). IC Role / Device Role / Timing Role: Primary DC-DC stage powering 32-bit ARM Cortex-M0+ MCU and digital sensor interface. Use Value: Guaranteed operation from -40°C to +85°C ambient, with thermal shutdown protecting against enclosure overheating during extended transmission cycles. |
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 | Fixed 1.2V output, 1.8MHz switching, 400mA max output, 22μA IQ, WSON-6 package | Lower current rating and smaller package limit use in higher-load peripherals; lacks PSM mode | Select when board space is tighter than 2.9×2.8mm and load never exceeds 400mA. |
| AP63201WS-7 | Adjustable 0.6–5.5V output, 2A max, 1.5MHz, 30μA IQ, SOT-23-6 package | Higher current and adjustable VOUT require external resistors; larger footprint and different pinout | Choose when future voltage flexibility or >800mA headroom is required, accepting added BOM and layout complexity. |
Compared with TPS62231DRYR and AP63201WS-7, the PAM2301CAAB120 delivers optimal balance of 800mA capability, ultra-low 40μA quiescent current, fixed 1.2V simplicity, and industry-standard TSOT25 footprint-making it ideal for cost-sensitive, space-constrained, battery-powered applications where 1.2V is the target rail.
Availability
PAM2301CAAB120 is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth Low Energy modules, smart remote controls, and industrial sensor nodes requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for PAM2301CAAB120 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 automotive markets.
The PAM2301 belongs to Diodes' high-density DC-DC converter product line, engineered specifically for ultra-compact, battery-powered portable electronics demanding high light-load efficiency, low quiescent current, and minimal external component count.
FAQ
What is the minimum input voltage required for PAM2301CAAB120 to regulate 1.2V output?
The PAM2301CAAB120 requires a minimum input voltage of 2.5V to maintain regulation at 1.2V output. Below this threshold, under-voltage lockout (UVLO) disables the device to prevent unstable operation and excessive battery drain. The UVLO turn-on threshold is typically 2.3V with hysteresis, ensuring reliable startup once the input rises above specification.
Can PAM2301CAAB120 be used with ceramic output capacitors?
Yes - the PAM2301CAAB120 is fully compatible with ceramic output capacitors. Its current-mode control and internal compensation are optimized for low-ESR ceramics such as X5R or X7R dielectrics. A typical design uses 10μF, 6.3V X5R in 0603 or 0805 case size, providing low ripple (<15mVpp) and excellent transient response without requiring tantalum or aluminum electrolytic alternatives.
Does PAM2301CAAB120 support 100% duty cycle operation?
Yes - when input voltage approaches or equals the 1.2V output, the PAM2301CAAB120 enters 100% duty cycle mode, turning on the internal P-MOSFET continuously. In this mode, output voltage equals VIN minus the drop across RDS(ON) (~0.3Ω) and inductor DCR, enabling near-lossless pass-through operation down to ~1.3V input while maintaining regulation.
How is thermal performance managed in the TSOT25 package?
The TSOT25 package features exposed thermal pad (pin 2/GND) that must be soldered to a dedicated PCB copper pour for effective heat dissipation. With θJA = 250°C/W, a 100mm² 2-oz copper pad reduces junction-to-ambient rise to ~50°C at 800mA full load. Thermal shutdown activates at +150°C junction temperature and resets at +120°C, providing robust overtemperature protection without external components.
PAM2301CAAB120 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 800mA
- 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
PAM2301CAAB120 FAQ
1.How can I place an order for PAM2301CAAB120 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2301CAAB120 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 PAM2301CAAB120 reliable?
The price and inventory of PAM2301CAAB120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2301CAAB120 is usually 5 days.
3.What payment methods are accepted for PAM2301CAAB120?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2301CAAB120 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2301CAAB120?
PAM2301CAAB120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2301CAAB120 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 PAM2301CAAB120?
For technical support, including PAM2301CAAB120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2301CAAB120 requirements.
6.How does Aetrix verify that PAM2301CAAB120 is sourced from the original manufacturer or authorized distributors?
All PAM2301CAAB120 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 PAM2301CAAB120 meets industry standards.
7.What is the process for return or replacement of PAM2301CAAB120?
All PAM2301CAAB120 units undergo pre-shipment inspection (PSI). If there is an issue with PAM2301CAAB120, 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 PAM2301CAAB120 part is unused and in its original packaging.
Return procedure for PAM2301CAAB120:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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