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Diodes Incorporated AP1605SL-13
- Part No.:
- AP1605SL-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1605SL-13.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
AP1605SL-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 AP1605SL-13 datasheet, AP1605SL-13 pinout, AP1605SL-13 application, or AP1605SL-13 equivalent, key selection criteria include its SO-8 mini-package footprint, 300kHz fixed-frequency oscillation, low 100µA operating current, CE-controlled enable/disable function, and feedback-based output voltage adjustability via external resistor divider.
Technical Context
The AP1605SL-13 implements auto-switching between PFM (0–25% duty) at light load and PWM (25–100% duty) at medium-to-heavy load, maintaining constant 300kHz switching frequency to simplify EMI filtering. Its internal 1.2V reference feeds an error amplifier that compares FB voltage against VREF, driving a CMOS control circuit that modulates the integrated P-channel MOSFET gate.
It features separate PVCC (power switch supply) and VCC (logic supply) pins, enabling optimized gate drive and low-noise biasing. The CE pin provides TTL-compatible enable/disable control with <0.2V logic-low threshold and <0.65×VCC logic-high threshold, supporting system-level power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 7V - supports single Li-ion (up to 4.2V), dual-cell NiMH/NiCd (up to 3.0V), or AC adapter inputs. |
| Output Voltage Accuracy | ±2.5% - set externally via FB resistor divider; enables stable 3.3V/3.0V/2.5V/1.8V outputs. |
| Oscillation Frequency | 300kHz (typ.) - fixed frequency simplifies filter design and EMI compliance for portable applications. |
| Switch Current Rating | 3A peak - supports high-current loads like microprocessor cores or audio amplifiers without external FET. |
| Quiescent Current | 100µA max - extends battery life in always-on subsystems such as real-time clocks or sensor interfaces. |
| Power-Off Current | 2µA max - ensures negligible drain during standby or shutdown modes. |
| Reference Voltage | 1.2V ±37.5mV - precision internal bandgap reference enables accurate output regulation across temperature. |
Pinout & Package
AP1605SL-13 is housed in an SO-8 mini package (4.9mm × 6.0mm, 1.45mm height), lead-free and RoHS-compliant, with exposed thermal pad not connected internally. Pin 1 is FB (feedback), Pin 2 is CE (enable), Pins 5–6 are SW (switch node), Pins 7–8 are VSS (ground), Pin 3 is VCC (logic supply), and Pin 4 is PVCC (power switch supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider from output; sets regulated voltage via 1.2V internal reference. |
| 2 CE | Chip Enable | TTL-compatible digital input: high ≥0.65×VCC enables regulator; low ≤0.2V disables output and reduces IQ to 2µA. |
| 3 VCC | Logic Supply | Bias supply for control circuitry; requires 0.1µF decoupling to VSS and series 10Ω resistor from PVCC. |
| 4 PVCC | Power Switch Supply | Direct connection to input rail; powers internal P-MOSFET gate driver and handles high di/dt transients. |
| 5, 6 SW | Switch Node | Drives external inductor and catch diode; high dv/dt node requiring minimized trace area to reduce EMI. |
| 7, 8 VSS | Ground Reference | Common return path for logic, power, and feedback circuits; must be low-impedance and thermally coupled. |
Key Features
| Feature | Design Value |
|---|---|
| PWM/PFM Dual-Mode Control | Automatically transitions between PFM (light-load, ultra-low IQ) and PWM (heavy-load, high-efficiency) without external mode-select signals. |
| Integrated P-Channel Power MOSFET | Eliminates need for external high-side switch; reduces BOM count and PCB area in compact portable designs. |
| Separate VCC and PVCC Supplies | Enables independent optimization of logic biasing (low noise) and power switching (high current), improving stability and transient response. |
| UVLO Protection | Undervoltage lockout activates below 2.2V input, preventing erratic operation during battery depletion or brownout conditions. |
| Thermal Shutdown | Internal protection disables regulator if junction temperature exceeds safe limit, preventing damage during overload or poor heatsinking. |
Applications
| Portable Audio Power Supply | Microcomputer Core Supply |
|---|---|
Use Scenario: Powering headphone amplifiers and DACs in portable CD players and Bluetooth earbuds. IC Role / Device Role / Timing Role: Primary DC/DC converter regulating 3.3V from dual NiMH cells or USB input. Use Value: Low 100µA quiescent current preserves battery runtime; 300kHz fixed frequency avoids audible noise in audio band. | Use Scenario: Supplying 2.5V core voltage to ARM Cortex-M microcontrollers in handheld test equipment. IC Role / Device Role / Timing Role: Step-down regulator with fast transient response for CPU load-step events. Use Value: 93% efficiency at 1A reduces thermal load; CE pin enables processor-controlled sleep/wake sequencing. |
| Camera Sensor Bias Supply | AC Adapter Post-Regulator |
Use Scenario: Generating clean 1.8V for CMOS image sensors in compact digital cameras. IC Role / Device Role / Timing Role: Fixed-output buck converter with low ripple for analog sensor bias rails. Use Value: PFM mode minimizes noise during idle frames; 1.2V reference ensures tight output tolerance under varying battery voltage. | Use Scenario: Regulating unregulated 7V AC adapter output down to stable 5V for USB peripherals. IC Role / Device Role / Timing Role: High-input-voltage buck controller handling wide line variations. Use Value: 7V absolute maximum input rating accommodates adapter overshoot; UVLO prevents startup instability at low line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3418WU-7 | Higher 1.5MHz switching frequency; no integrated P-MOSFET; requires external high-side switch. | Targets space-constrained designs needing smaller inductors; lacks integrated switch, increasing component count. | Select when board area is critical and external FET layout is acceptable. |
| AP63205WU-7 | 3A synchronous buck with integrated N-MOSFET pair; 500kHz fSW; 20µA shutdown current. | Offers higher efficiency at mid-load and lower dropout; requires different compensation network. | Select for new designs prioritizing efficiency over legacy compatibility or cost-sensitive BOMs. |
Compared with AP1605SL-13, AP3418WU-7 trades integration for frequency scalability, while AP63205WU-7 replaces P-channel topology with synchronous rectification for improved light-load efficiency - both require redesign of feedback and loop compensation networks.
Availability
AP1605SL-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 AP1605SL-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The AP1605 belongs to Diodes' power management product line, engineered specifically for high-efficiency, low-quiescent-current DC/DC conversion in battery-operated portable electronics.
FAQ
What is the recommended minimum output capacitance for AP1605SL-13?
The datasheet specifies 100µF electrolytic or low-ESR ceramic at the output. This value ensures sufficient energy storage for load transients and stabilizes the control loop with the internal compensation network. Using less than 100µF may cause instability or excessive output ripple, especially above 1A load.
Can AP1605SL-13 operate with a 1.2V input voltage?
No. AP1605SL-13 has a minimum input voltage of 2.5V per its absolute maximum ratings and functional specifications. Below 2.5V, the internal reference and oscillator fail to start, and UVLO remains active. It is unsuitable for single-cell alkaline or fully depleted Li-ion applications.
Is the SW pin rated for continuous 3A current?
Yes - the SW pin is rated for 3A peak switch current, as confirmed by the Electrical Characteristics table under ISW. However, sustained 3A operation requires adequate PCB copper area, thermal vias to inner ground planes, and proper inductor saturation current rating to avoid overheating or inductor collapse.
Does AP1605SL-13 support adjustable soft-start?
No. AP1605SL-13 does not include programmable soft-start. Its startup behavior is determined by internal timing and the RC network on the CE pin if used for controlled enable. External soft-start requires adding a slow-ramp circuit at the FB node, which alters regulation accuracy and is not supported in the reference designs.
AP1605SL-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
AP1605SL-13 FAQ
1.How can I place an order for AP1605SL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1605SL-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 AP1605SL-13 reliable?
The price and inventory of AP1605SL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1605SL-13 is usually 5 days.
3.What payment methods are accepted for AP1605SL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1605SL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1605SL-13?
AP1605SL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1605SL-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 AP1605SL-13?
For technical support, including AP1605SL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1605SL-13 requirements.
6.How does Aetrix verify that AP1605SL-13 is sourced from the original manufacturer or authorized distributors?
All AP1605SL-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 AP1605SL-13 meets industry standards.
7.What is the process for return or replacement of AP1605SL-13?
All AP1605SL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1605SL-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 AP1605SL-13 part is unused and in its original packaging.
Return procedure for AP1605SL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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