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Diodes Incorporated AP1605SG-13
- Part No.:
- AP1605SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1605SG-13.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,393
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Product details
Overview
AP1605SG-13 from Diodes Incorporated is a PWM/PFM dual-mode step-down switching regulator IC with integrated P-channel power MOSFET, designed for portable battery-powered systems. It operates from 2.5V to 7V input, delivers up to 3A switch current, maintains 1.2V internal reference (±2.5%), and achieves 93% efficiency at 5VIN/2.5VOUT/1A - used in handheld audio devices and microcomputer power supplies.
For engineers reviewing the AP1605SG-13 datasheet, AP1605SG-13 pinout, AP1605SG-13 application, or AP1605SG-13 equivalent, key selection criteria include its SO-8 mini-package footprint, 300kHz fixed-frequency oscillation, 100µA max operating current, 2µA shutdown current, and feedback-based output voltage adjustability via external resistor divider.
Technical Context
The AP1605SG-13 implements a CMOS-based DC/DC converter architecture with auto-switching between PFM (0–25% duty) and PWM (25–100% duty) modes based on load current. Its internal 1.2V reference feeds an error amplifier that compares against FB voltage to regulate output.
It integrates a high-side P-channel MOSFET switch, oscillator circuit, and enable logic with CE pin control. The SW pin drives external inductor/diode, while PVCC and VCC are separately decoupled - PVCC powers the MOSFET driver, VCC powers signal circuitry through a 10Ω series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 7V - supports single Li-ion (3.0–4.2V), dual Ni-MH/Ni-Cd (2.4–3.0V), or AC adapter inputs |
| Output Voltage Accuracy | ±2.5% - set externally via FB resistor divider using 1.2V internal reference |
| Oscillation Frequency | 300kHz (typ.) - fixed frequency enables predictable EMI filtering and inductor sizing |
| Switch Current Rating | 3A peak - supports up to ~2A continuous output with proper thermal design in SO-8 |
| Quiescent Current | 100µA max - enables long battery life in always-on portable applications |
| Shutdown Current | 2µA max - ensures minimal leakage during system sleep or power-off states |
| Efficiency | 93% at 5VIN/2.5VOUT/1A - reduces thermal load and extends runtime in space-constrained designs |
Pinout & Package
AP1605SG-13 is housed in a lead-free, RoHS-compliant SO-8 mini-package (4.9mm × 6.0mm, 1.27mm pitch), optimized for compact portable power supply layouts with exposed pad thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider from output to set regulated voltage; high-impedance node requiring low-noise routing |
| 2 CE | Chip Enable | Active-high logic input; <0.2V disables regulator, >0.65×VCC enables operation |
| 3 VCC | Signal Power Supply | Powers internal logic; requires 0.1µF bypass capacitor and 10Ω series resistor from PVCC |
| 4 PVCC | Power MOSFET Driver Supply | Directly powers high-side P-MOS gate driver; connects to input rail with bulk capacitance |
| 5,6 SW | Switch Node | Drives external inductor/diode; high di/dt node requiring minimized trace area to reduce EMI |
| 7,8 VSS | Ground Reference | Common return for all internal circuits; must be low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| PWM/PFM Dual-Mode Control | Automatically transitions between PFM (light-load, ultra-low IQ) and PWM (heavy-load, stable fOSC) for optimal efficiency across full load range |
| Integrated P-Channel MOSFET | Eliminates need for external high-side switch; simplifies BOM and layout while reducing conduction losses |
| Low Operating Current | 100µA max IQ enables >1000-hour standby in coin-cell–powered devices without significant battery drain |
| Power-Off Function | CE pin allows full system-level power gating; 2µA shutdown current prevents battery depletion during storage |
| Fixed 300kHz Oscillator | Enables consistent filter design and predictable EMI behavior - no external timing components required |
Applications
| Portable Audio Power | Microcomputer Core Supply |
|---|---|
Use Scenario: Powering headphone amplifiers and DACs in battery-operated CD players and portable stereos. IC Role / Device Role / Timing Role: Primary step-down regulator converting 4.2V Li-ion to stable 3.3V or 2.5V analog/digital rails. Use Value: Low 100µA quiescent current preserves battery life during playback pauses; PFM mode maintains regulation at µA-level loads. | Use Scenario: Supplying core voltage to 8/16-bit microcontrollers in handheld instrumentation and remote sensors. IC Role / Device Role / Timing Role: Main DC/DC converter delivering 3.3V or 3.0V from two Ni-MH cells (2.4–3.0V) or single Li-ion (3.0–4.2V). Use Value: 93% efficiency minimizes self-heating in sealed enclosures; CE pin enables MCU-controlled power cycling. |
| Camera Sensor Bias | AC Adapter Post-Regulation |
Use Scenario: Generating clean 3.3V bias for CMOS image sensors and lens actuators in digital cameras and camcorders. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with fast transient response to handle sensor burst readout current spikes. Use Value: Fixed 300kHz switching enables effective LC filtering; internal MOSFET avoids external gate drive complexity. | Use Scenario: Regulating unregulated 7V AC adapter outputs down to 5V or 3.3V for embedded peripherals and USB-powered accessories. IC Role / Device Role / Timing Role: High-input-voltage buck converter accepting up to 7V input while maintaining tight line/load regulation. Use Value: 2.5–7V input range accommodates adapter tolerance and ripple; UVLO threshold of 2.2V prevents brownout restart cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3418SG-13 | Higher 500kHz fOSC, lower 60µA IQ, same SO-8 package and 2.5–7V input | Optimized for smaller inductors and tighter PCB space; less suitable for ultra-low-noise audio due to higher fOSC | Select when board area is constrained and higher switching noise is acceptable |
| AP63203WU-7 | 3A synchronous buck, 2.5–5.5V input, 1.2MHz fOSC, no CE pin, WLCSP-12 package | Requires different layout and lacks enable control; better for ultra-compact wearables but not drop-in replacement | Select only for new designs targeting smallest footprint and highest efficiency above 1A |
Compared with AP3418SG-13 and AP63203WU-7, the AP1605SG-13 offers best-in-class trade-off for portable audio and microcontroller power: moderate 300kHz frequency balances EMI and size, robust 7V input handles adapter surges, and CE pin enables precise system-level power sequencing.
Availability
AP1605SG-13 is available at Aetrix Electronics and suitable for portable audio equipment, microcomputer power supplies, camera sensor biasing, and AC adapter post-regulation requiring stable component supply despite end-of-life status.
Supply support for AP1605SG-13 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-reliability power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP1605 belongs to Diodes' legacy DC/DC converter product line, engineered specifically for cost-sensitive, space-constrained portable electronics requiring high efficiency and ultra-low quiescent current across wide input voltage ranges.
FAQ
What is the maximum recommended output current for AP1605SG-13 in SO-8 package?
The AP1605SG-13 supports up to 3A peak switch current, but continuous output current is thermally limited to approximately 2A in standard SO-8 layout with 2oz copper and minimal copper area. Derating is required above +60°C ambient; full 2A operation demands adequate PCB copper pour and airflow.
Can AP1605SG-13 be used without the external diode in synchronous mode?
No - AP1605SG-13 uses an internal P-channel MOSFET as the high-side switch but requires an external Schottky or fast recovery diode for the low-side path. It is not a synchronous buck regulator; the diode completes the freewheeling path during MOSFET off-time.
How does the CE pin function during power-up and shutdown sequences?
The CE pin is active-high with TTL-compatible thresholds: below 0.2V disables the regulator (SW stops switching, VOUT drops), above 0.65×VCC enables it. During power-up, CE must be held low until input voltage stabilizes above UVLO (2.2V); during shutdown, pulling CE low ensures 2µA quiescent current and eliminates residual output leakage.
Is AP1605SG-13 still manufacturable, and what are the implications for long-term design use?
Per Diodes' ordering information, AP1605SG-13 is marked "In production" but all Lead-Free variants are End-of-Life without replacement. Aetrix Electronics maintains final-buy inventory and provides lifecycle coordination support, including obsolescence alerts and migration path guidance for new designs.
AP1605SG-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 2.2V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
AP1605SG-13 FAQ
1.How can I place an order for AP1605SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1605SG-13 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 AP1605SG-13 reliable?
The price and inventory of AP1605SG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1605SG-13 is usually 5 days.
3.What payment methods are accepted for AP1605SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1605SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1605SG-13?
AP1605SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1605SG-13 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 AP1605SG-13?
For technical support, including AP1605SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1605SG-13 requirements.
6.How does Aetrix verify that AP1605SG-13 is sourced from the original manufacturer or authorized distributors?
All AP1605SG-13 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 AP1605SG-13 meets industry standards.
7.What is the process for return or replacement of AP1605SG-13?
All AP1605SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1605SG-13, 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 AP1605SG-13 part is unused and in its original packaging.
Return procedure for AP1605SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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