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Diodes Incorporated AP1635SL-13
- Part No.:
- AP1635SL-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1635SL-13.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,613
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Product details
Overview
AP1635SL-13 from Diodes Incorporated is a PWM/PFM dual-mode step-down DC/DC converter in SOP-8L package, delivering up to 1.2A output current with external inductor/diode/capacitor, 700kHz typical switching frequency, 1.0V internal reference (±2.5% FB accuracy), and 93% peak efficiency-designed for compact portable power rails in cellular phones and palmtops.
For engineers reviewing the AP1635SL-13 datasheet, AP1635SL-13 pinout, AP1635SL-13 application, or AP1635SL-13 equivalent, key selection considerations include light-load PFM operation, 6µA standby current, CE/SS-controlled soft-start, 2.2–5V input range, and thermal/current protection for battery-powered systems.
Technical Context
The AP1635SL-13 integrates a PWM/PFM hybrid controller with internal 1.0V reference and ramp-based oscillator, enabling automatic mode transition between fixed-frequency PWM (heavy load) and variable-frequency PFM (light load) to maintain high efficiency across 10mA–1.2A output range. It uses external feedback resistors to set VOUT with ±2.5% accuracy.
Its dual power supply pins-PVcc (main IC power) and SVcc (signal supply with 20Ω isolation resistor)-support low-noise control circuitry. The device features overcurrent limiting (1.2–1.6A peak), thermal shutdown, UVLO (2V min), and CE/SS pin that enables soft-start via external capacitor and forces shutdown below 0.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 5V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH battery inputs. |
| Switching Frequency | 700kHz (typ.) - enables use of small 10µH inductors and compact 68µF output capacitors. |
| Feedback Reference | 1.0V (±2.5%) - sets output voltage via external resistor divider (VOUT = 1×(1 + R1/R2)). |
| Peak Efficiency | 93% at 5VIN/3.3VOUT/300mA - minimizes thermal rise in space-constrained portable PCBs. |
| Standby Current | <6µA at CE/SS = LOW - extends battery life during system sleep modes. |
| Current Limit | 1.4A (typ.) - protects external MOSFET and inductor under short-circuit or overload conditions. |
| UVLO Threshold | 2.0V - prevents erratic startup or dropout during battery sag below usable voltage. |
Pinout & Package
SOP-8L (Small Outline Package, 8-pin, lead-free, green molding compound), 4.9mm × 6.0mm body, 1.27mm pitch, RoHS-compliant, IATF 16949-manufactured.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback Input | Monitors output voltage via resistor divider; regulates VOUT to 1.0V reference. |
| CE/SS (Pin 2) | Enable / Soft-Start Control | High enables operation; external capacitor to GND sets soft-start ramp time; low disables output and draws <6µA. |
| SVcc (Pin 3) | Signal Supply | Powers internal control circuitry; requires 20Ω series resistor from PVcc and 0.1µF bypass to GND. |
| PVcc (Pin 4) | Main Power Supply | Connects directly to input rail (2.2–5V); supplies gate drivers and power stage. |
| SW (Pins 5 & 6) | Power Switch Node | Drives external inductor/diode; high di/dt node requiring minimized trace area to reduce EMI. |
| GND (Pins 7 & 8) | Ground Return | Dual GND pins provide low-impedance return path for power and signal grounds; must be tied together externally. |
Key Features
| Feature | Design Value |
|---|---|
| PWM/PFM Dual-Mode Operation | Automatically switches to PFM at light loads to sustain >85% efficiency down to 10mA, eliminating audible coil whine. |
| Integrated Soft-Start | Controlled via CE/SS pin capacitance; prevents inrush current and output overshoot during power-up. |
| Thermal & Overcurrent Protection | Shuts down on die temperature >150°C or peak switch current >1.6A; auto-recovers after fault clearance. |
| Low Quiescent Current | 90–120µA operating current (no load) enables long standby in always-on portable devices. |
| UVLO with Hysteresis | 2.0V turn-on threshold with built-in hysteresis prevents oscillation near battery cutoff voltage. |
Applications
| Cellular Phones | Palmtop Computers |
|---|---|
Use Scenario: Primary 3.3V or 2.8V core rail generation from single-cell Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Step-down DC/DC converter providing regulated, low-noise power to baseband processor and RF transceiver. Use Value: 93% efficiency and 700kHz switching minimize heat and board area; PFM mode extends talk-time by >15% at standby current. | Use Scenario: Multi-rail power management for LCD controller, flash memory, and touch controller in handheld PDAs. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting multiple VDD domains via resistor-programmable feedback. Use Value: ±2.5% FB accuracy ensures stable logic voltage margins; dual GND pins reduce ground bounce in mixed-signal layouts. |
| Portable Audio Systems | Electronic Information Organizers |
Use Scenario: Clean 1.8V supply for DAC/codec ICs in MP3 players and Bluetooth headsets. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source with fast transient response to audio burst loads. Use Value: 6µA standby current preserves battery charge during pause mode; soft-start prevents pop noise at power-on. | Use Scenario: Compact 3.3V rail for microcontroller, SRAM, and display driver in pocket-sized organizers. IC Role / Device Role / Timing Role: High-efficiency, space-optimized DC/DC converter replacing linear regulators to extend battery life. Use Value: Small 10µH inductor + 68µF capacitor solution fits <8mm² footprint; SOP-8L allows automated reflow assembly. |
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 |
|---|---|---|---|
| AP61100WU-7 | Pin-compatible successor; 1.2MHz switching, 2A output, integrated MOSFETs, 1.0V reference. | Higher current, smaller solution size, no external diode required; replaces AP1635 in new designs. | Select for new designs requiring higher output current, lower BOM count, and AEC-Q100 option. |
| MP2143DJ-LF-Z | 3.5–28V input, 3A output, 500kHz, 0.8V reference; different pinout and control architecture. | Wider VIN range suits industrial 12V/24V inputs; not drop-in but viable for redesigns with layout flexibility. | Select when upgrading from 5V-only systems to broader input ranges or higher current demands. |
Compared with AP1635SL-13, AP61100WU-7 offers higher integration and performance in same footprint, while MP2143DJ-LF-Z trades pin compatibility for wider input capability and higher current-both require schematic and layout revision but address obsolescence with verified alternatives.
Availability
AP1635SL-13 is available at Aetrix Electronics and suitable for cellular phones, palmtop computers, portable audio systems, and electronic information organizers requiring stable component supply despite end-of-life status.
Supply support for AP1635SL-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 power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP1635 belongs to Diodes' legacy DC/DC converter product line, designed specifically for cost-sensitive, space-constrained portable electronics requiring high-efficiency, dual-mode regulation with minimal external components.
FAQ
Is AP1635SL-13 still in production?
No-AP1635SL-13 is officially obsolete and discontinued per Diodes Incorporated's product change notice. Aetrix Electronics maintains limited legacy stock and supports last-time-buy programs with full traceability and documentation for ongoing production needs.
What is the recommended replacement for AP1635SL-13?
Diodes Incorporated recommends AP61100WU-7 as the direct functional successor: same SOP-8L package, 1.0V reference, 1.2MHz operation, integrated high-side/low-side MOSFETs, and 2A output capability-requiring only minor compensation and output capacitor updates.
Can AP1635SL-13 operate without an external diode?
No-it requires an external Schottky diode (e.g., B240A) in the typical application circuit. Unlike synchronous buck converters, AP1635SL-13 uses an external diode for freewheeling; omitting it causes failure due to lack of current path during low-side conduction.
What is the maximum output current achievable with AP1635SL-13?
AP1635SL-13 supports up to 1.2A continuous output current under proper thermal conditions: using recommended 10µH inductor, low-ESR 68µF output capacitor, adequate copper pour on PVcc/GND pads, and ambient temperature ≤60°C. Peak current limit is 1.4A (typical), but sustained >1A requires careful thermal design.
AP1635SL-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):
- 2.2V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -25°C ~ 80°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
AP1635SL-13 FAQ
1.How can I place an order for AP1635SL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1635SL-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 AP1635SL-13 reliable?
The price and inventory of AP1635SL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1635SL-13 is usually 5 days.
3.What payment methods are accepted for AP1635SL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1635SL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1635SL-13?
AP1635SL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1635SL-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 AP1635SL-13?
For technical support, including AP1635SL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1635SL-13 requirements.
6.How does Aetrix verify that AP1635SL-13 is sourced from the original manufacturer or authorized distributors?
All AP1635SL-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 AP1635SL-13 meets industry standards.
7.What is the process for return or replacement of AP1635SL-13?
All AP1635SL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1635SL-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 AP1635SL-13 part is unused and in its original packaging.
Return procedure for AP1635SL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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