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Diodes Incorporated PAM2305AAB180
- Part No.:
- PAM2305AAB180
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
PAM2305AAB180.pdf
- Description:
- IC REG BUCK 1.8V 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,265
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Product details
Overview
PAM2305AAB180 from Diodes Incorporated is a 1A synchronous step-down DC-DC converter with fixed 1.8V output, designed for portable battery-powered systems. It operates from 2.5V to 5.5V input, delivers up to 1A continuous load, achieves 96% peak efficiency, and features 1.5MHz PWM switching with pulse-skipping mode (PSM) for ultra-low 40µA quiescent current under light load - enabling extended runtime in handheld electronics.
For engineers reviewing the PAM2305AAB180 datasheet, PAM2305AAB180 pinout, PAM2305AAB180 application, or PAM2305AAB180 equivalent, key selection criteria include its TSOT25 package footprint, 0.6V internal reference for feedback accuracy, 1.5V enable threshold, thermal shutdown at 150°C, and compatibility with ceramic input/output capacitors in space-constrained designs.
Technical Context
The PAM2305AAB180 employs current-mode PWM control with internal P-channel and N-channel MOSFETs for synchronous rectification, delivering stable regulation across 2.5–5.5V input while maintaining tight 0.6V ±2% feedback reference accuracy. Its 1.5MHz fixed-frequency operation enables compact external LC filtering using standard 2.2µH inductors and 10µF ceramic capacitors.
Under light load, it automatically transitions to pulse-skipping modulation (PSM), reducing switching losses and holding quiescent current at 40µA typical - critical for standby power budgets in always-on peripherals. Integrated soft-start limits inrush current, while cycle-by-cycle peak current limiting (1.5A) and thermal shutdown (150°C trip, 120°C hysteresis) ensure robust fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V - eliminates external feedback resistors and simplifies layout for single-rail LDO replacement. |
| Input Voltage Range | 2.5V to 5.5V - supports single Li+/Li-Po cell, USB VBUS, or dual alkaline/NiMH sources without pre-regulation. |
| Max Output Current | 1A continuous - sufficient for microcontrollers, RF transceivers, and display drivers in portable devices. |
| Switching Frequency | 1.5MHz typical - enables use of small 2.2µH inductors and reduces EMI fundamental frequency above AM band. |
| Quiescent Current | 40µA typical in PSM mode - extends battery life in sleep/standby states of IoT sensors and wearables. |
| Feedback Reference | 0.6V ±2% - ensures ±3% output voltage accuracy over line/load/temperature, verified per datasheet test conditions. |
| Shutdown Current | <0.1µA - fully isolates input from output during system hibernation, preventing battery drain. |
Pinout & Package
Supplied in the 5-pin TSOT25 (SOT-25) package - 2.9mm × 1.6mm × 1.0mm body with exposed thermal pad - optimized for low-profile, high-density PCB layouts in handheld devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 2.5–5.5V supply; connects directly to input capacitor to minimize high-frequency ripple injection. |
| GND | Power ground | Common return for input/output paths and IC substrate; must be tied to thermal pad for optimal heat dissipation. |
| EN | Enable control input | Active-high logic: ≥1.5V enables regulation; ≤0.3V forces shutdown with <0.1µA current draw. |
| VOUT/FB | Output voltage sense / feedback | Internally referenced to 0.6V; for fixed-output variants like PAM2305AAB180, this pin is internally connected to regulated 1.8V output. |
| SW | Switch node | Drain connection of internal P- and N-MOSFETs; requires low-inductance routing to inductor and minimal loop area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P- and N-MOSFETs eliminate external diode, raising efficiency to 96% and reducing thermal load. |
| Pulse-skipping modulation (PSM) | Automatically engages below ~100mA load, cutting quiescent current to 40µA and preserving battery capacity. |
| Soft-start circuit | Digital ramp limits inrush current during startup, preventing input rail collapse and eliminating output overshoot. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and resumes only after cooling to 120°C - prevents thermal runaway in sealed enclosures. |
| Under-voltage lockout (UVLO) | Disables operation when VIN drops below ~2.3V, protecting batteries from deep discharge and ensuring clean reset behavior. |
Applications
| Wireless Headset Power Rail | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Compact Bluetooth headset requiring stable 1.8V for audio codec and BLE SoC during intermittent transmit/receive cycles. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic voltage; manages dynamic load steps from 10µA (idle) to 800mA (TX burst). Use Value: PSM mode extends talk time by 35% vs. forced-PWM alternatives; TSOT25 footprint fits within 8mm × 8mm PCB area constraint. |
Use Scenario: Low-noise 1.8V bias for CMOS image sensor in portable digital camera, where ripple must stay below 10mVpp to avoid fixed-pattern noise. IC Role / Device Role / Timing Role: Precision DC-DC converter with 0.6V reference and <±3% output accuracy; supplies analog front-end and digital interface rails. Use Value: 1.5MHz switching allows ceramic capacitor filtering to achieve <5mVpp ripple at full 1A load - meeting sensor PSRR requirements. |
| Smart Wearable MCU Core Supply | USB-C Peripheral Hub Logic Rail |
|
Use Scenario: Fitness tracker with ARM Cortex-M0+ MCU, accelerometer, and OLED display operating from single-cell Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Main system regulator delivering 1.8V to MCU core and peripherals; supports dynamic voltage scaling during sleep/wake transitions. Use Value: 40µA quiescent current enables >14-day standby on 120mAh battery; EN pin allows host MCU to gate power to subsystems. |
Use Scenario: Multi-port USB-C hub with integrated PD controller and level shifters requiring clean 1.8V for I²C and GPIO logic interfaces. IC Role / Device Role / Timing Role: Secondary buck stage deriving 1.8V from 5V USB VBUS; coexists with 3.3V and 5V rails in shared power domain. Use Value: Input range (2.5–5.5V) covers full USB-C VBUS tolerance (4.75–5.5V); 1.5V EN threshold ensures reliable turn-on even with marginal VBUS droop. |
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 | 1.8V fixed output, 1.2MHz switching, 25µA IQ, but rated for only 0.6A max output current. | Lower current capability limits use to sub-600mA loads; lacks PSM-to-PWM transition transparency. | Select when board space is tighter (1.6mm × 1.6mm DSBGA) and load never exceeds 600mA. |
| RT8059GJ6 | 1.8V fixed output, 1.5MHz, 45µA IQ, 1A rating, but uses external compensation and requires larger 6-pin SOT-23-6 footprint. | Requires two external resistors and one capacitor for stability; less integrated than PAM2305's all-internal design. | Choose if existing design uses RT8059 and needs drop-in validation; not recommended for new miniaturized layouts. |
Compared with TPS62231DRYR and RT8059GJ6, the PAM2305AAB180 uniquely combines 1A capability, 40µA PSM quiescent current, and TSOT25 integration - making it optimal for next-gen wearables where size, efficiency, and full-load headroom are simultaneously constrained.
Availability
PAM2305AAB180 is available at Aetrix Electronics and suitable for wireless headsets, smart wearables, digital cameras, and USB-C peripheral hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for PAM2305AAB180 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' Power Management IC product line, engineered specifically for ultra-compact, battery-sensitive portable electronics requiring high efficiency at light and full load - with emphasis on minimizing solution size and maximizing runtime.
FAQ
What is the maximum allowable input voltage for PAM2305AAB180?
The absolute maximum input voltage is +6.0V, but the recommended operating range is strictly 2.5V to 5.5V per datasheet specifications. Exceeding 5.5V risks permanent damage to the internal MOSFETs and control circuitry, even momentarily. Applications powered from unregulated sources must include clamping or pre-regulation to remain within this window.
Does PAM2305AAB180 require external feedback resistors?
No - the "180" suffix denotes a factory-trimmed 1.8V fixed-output version, with internal resistor divider connected to the FB pin. No external R1/R2 network is needed, reducing BOM count and PCB area. This differs from the ADJ variant (PAM2305AABADJ), which requires external resistors to set output voltage.
How does thermal performance differ between TSOT25 and QFN3x3 packages?
The TSOT25 package has θJA = 250°C/W (JEDEC 2-layer board), limiting continuous 1A operation to ambient temperatures ≤45°C without heatsinking. In contrast, the QFN3x3-16 package offers θJA = 35°C/W, supporting full 1A load up to +85°C ambient - making it suitable for thermally dense applications where the TSOT25 would require derating or airflow.
Can PAM2305AAB180 operate in 100% duty cycle dropout mode?
Yes - when VIN approaches 1.8V, the device enters dropout and holds the P-channel MOSFET fully on. Output voltage then equals VIN minus ILOAD × RDS(ON) (0.3Ω typical), enabling regulation down to ~1.9V input. This extends usable battery range beyond typical buck limitations, particularly valuable for single-cell Li-ion systems discharging to 2.8V.
PAM2305AAB180 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 1.8V
- Voltage - Output (Max):
- -
- 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
PAM2305AAB180 FAQ
1.How can I place an order for PAM2305AAB180 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM2305AAB180 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 PAM2305AAB180 reliable?
The price and inventory of PAM2305AAB180 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM2305AAB180 is usually 5 days.
3.What payment methods are accepted for PAM2305AAB180?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM2305AAB180 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM2305AAB180?
PAM2305AAB180 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM2305AAB180 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 PAM2305AAB180?
For technical support, including PAM2305AAB180 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM2305AAB180 requirements.
6.How does Aetrix verify that PAM2305AAB180 is sourced from the original manufacturer or authorized distributors?
All PAM2305AAB180 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 PAM2305AAB180 meets industry standards.
7.What is the process for return or replacement of PAM2305AAB180?
All PAM2305AAB180 units undergo pre-shipment inspection (PSI). If there is an issue with PAM2305AAB180, 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 PAM2305AAB180 part is unused and in its original packaging.
Return procedure for PAM2305AAB180:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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