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Diodes Incorporated AP1635SG-13
- Part No.:
- AP1635SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1635SG-13.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
AP1635SG-13 from Diodes Incorporated is a PWM/PFM dual-mode synchronous 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, high-efficiency power rails in portable audio systems and cellular handsets.
For engineers reviewing the AP1635SG-13 datasheet, AP1635SG-13 pinout, AP1635SG-13 application, or AP1635SG-13 equivalent, key selection criteria include light-load PFM operation, soft-start via CE/SS pin, <6µA standby current, thermal shutdown protection, and ±2.5% output voltage regulation across 2.2–5V input range.
Technical Context
The AP1635SG-13 integrates a PWM/PFM hybrid controller with internal 1.0V reference and ramp-based oscillator (700kHz typ.), enabling seamless mode transition between fixed-frequency PWM at heavy loads and variable-frequency PFM at light loads to maintain high efficiency across full load range. It uses external feedback resistors to set output voltage and supports soft-start via capacitor on CE/SS pin.
Its dual-switch architecture drives external MOSFETs through SW pins (5 & 6), while SVcc and PVcc provide separate signal and power supply paths with dedicated decoupling (20Ω + 0.1µF). Current limit (1.2–1.6A) and thermal shutdown ensure robust overcurrent protection without external sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 5.0V - supports single-cell Li-ion, Li-poly, or dual-cell alkaline input sources directly. |
| Switching Frequency | 700kHz (typ.) - enables use of small 10µH inductors and low-ESR ceramic capacitors for board space reduction. |
| Feedback Reference | 1.0V (±2.5%) - sets output voltage via external resistor divider (VOUT = 1V × (1 + R1/R2)). |
| Peak Efficiency | 93% (at 5VIN/3.3VOUT/300mA) - minimizes thermal rise and extends battery runtime in portable devices. |
| Standby Current | <6µA (CE/SS = LOW) - enables ultra-low-power shutdown for system-level energy budgeting. |
| Current Limit | 1.4A (typ., peak) - provides reliable short-circuit protection without requiring external current-sense circuitry. |
| RDS(on) | 350–450mΩ (at IOUT = 300mA) - defines conduction loss in integrated power switches under nominal load conditions. |
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 with ±2.5% accuracy. |
| CE/SS (Pin 2) | Chip Enable / Soft-Start | Logic-controlled enable/disable; capacitor to GND sets soft-start ramp time and prevents inrush current. |
| SVcc (Pin 3) | Signal Supply | Powers internal control circuitry; requires 20Ω series resistor + 0.1µF bypass to GND for noise isolation. |
| PVcc (Pin 4) | Power Supply | Supplies gate drive and power stage; connects directly to input rail with local 0.1µF decoupling. |
| SW (Pins 5 & 6) | Switch Node | Drives external inductor/diode; dual-pin layout reduces trace inductance and EMI radiation. |
| GND (Pins 7 & 8) | Ground Return | Dual GND pins minimize ground bounce and improve thermal dissipation in high-current switching paths. |
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 | Capacitor on CE/SS pin controls output voltage ramp rate, preventing overshoot and reducing stress on output capacitors. |
| Thermal Shutdown Protection | Halts switching when junction temperature exceeds safe limit (~150°C), resuming automatically after cooldown. |
| Low Standby Current | <6µA shutdown current enables multi-day battery hold-up in always-on subsystems (e.g., RTC backup rails). |
| UVLO Threshold | 2.0V minimum operating input ensures stable startup only when input rail is sufficiently charged. |
Applications
| Cellular Handsets | Portable Audio Systems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2–1.8V) from single-cell Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise core supply with dynamic load transient response. Use Value: 93% efficiency at 300mA and PFM mode at idle extend talk time by >12% versus fixed-frequency alternatives. | Use Scenario: Generating 3.3V analog supply for DAC, headphone amp, and codec in Bluetooth earbuds. IC Role / Device Role / Timing Role: High PSRR, low-ripple DC/DC source decoupled from noisy digital domains via SVcc/PVcc separation. Use Value: Dual GND pins and 700kHz switching reduce conducted EMI into sensitive audio paths, lowering THD+N by 8dB. |
| Palmtop PDAs | Electronic Information Organizers |
Use Scenario: Supplying 2.8V I/O voltage for memory and display interface in space-constrained handhelds. IC Role / Device Role / Timing Role: Compact, resistor-programmable buck converter enabling flexible voltage scaling without custom ICs. Use Value: SOP-8L footprint and 10µH inductor allow full power stage within 12mm² PCB area, meeting palmtop size targets. | Use Scenario: Providing 1.8V logic rail for microcontroller and flash memory in low-cost organizer devices. IC Role / Device Role / Timing Role: Cost-optimized, external-component-dependent buck regulator supporting wide input (2.2–5V) from coin cells or USB. Use Value: ±2.5% FB accuracy and 1.0V reference ensure reliable memory read/write margins across battery discharge curve. |
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 | Single-mode PWM (1.5MHz), no PFM; 1.0V reference; 1.2A rating; WLCSP-12 package. | Higher frequency allows smaller passives but lacks light-load efficiency optimization. | Preferred for ultra-compact designs where board area is more critical than standby power. |
| MP2158GJ-Z | 3.5V–18V input; 1.2A; 2.2MHz; integrated MOSFETs; 1.2V reference; QFN-10 package. | Wider VIN range and monolithic design simplify BOM but require higher minimum input voltage. | Recommended when input exceeds 5V or when integrated FETs reduce layout complexity. |
Compared with AP61100WU-7 and MP2158GJ-Z, the AP1635SG-13 uniquely balances light-load PFM efficiency, low-VIN capability (2.2V), and SOP-8L manufacturability-making it optimal for cost-sensitive, battery-powered 2.2–5V systems where standby current and thermal performance are prioritized over footprint minimization.
Availability
AP1635SG-13 is available at Aetrix Electronics and suitable for cellular handsets, portable audio systems, palmtop PDAs, and electronic information organizers requiring stable component supply despite its obsolete status-inventory is sourced from verified legacy channels with full traceability.
Supply support for AP1635SG-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 series belongs to Diodes' legacy high-efficiency DC/DC converter product line, engineered specifically for space-constrained, battery-operated portable electronics demanding low quiescent current and dual-mode efficiency optimization.
FAQ
Is AP1635SG-13 still in production?
No-AP1635SG-13 is officially discontinued per Diodes Incorporated's product change notice (Rev. 5, March 2020). Aetrix Electronics offers remaining factory-new inventory with full traceability and documentation, intended for legacy system repair, spare parts, or end-of-life production runs.
What is the function of the SVcc pin?
SVcc (Pin 3) supplies power exclusively to the internal control circuitry-including error amplifier, PWM/PFM logic, and reference-requiring a 20Ω series resistor and 0.1µF bypass capacitor to GND to isolate noise from the power-switching path and prevent regulation instability.
Can AP1635SG-13 be used without an external diode?
No-the AP1635SG-13 is a non-synchronous buck controller with external high-side and low-side switch drivers; it requires an external Schottky diode (e.g., B240A) in the typical application circuit to complete the freewheeling path during low-side conduction.
How is output voltage set?
VOUT is set by a resistor divider (R1/R2) from output to FB (Pin 1) and GND, using the internal 1.0V reference: VOUT = 1.0V × (1 + R1/R2). R1 is recommended between 100kΩ and 200kΩ to balance divider current, noise immunity, and accuracy.
AP1635SG-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
AP1635SG-13 FAQ
1.How can I place an order for AP1635SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1635SG-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 AP1635SG-13 reliable?
The price and inventory of AP1635SG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1635SG-13 is usually 5 days.
3.What payment methods are accepted for AP1635SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1635SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1635SG-13?
AP1635SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1635SG-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 AP1635SG-13?
For technical support, including AP1635SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1635SG-13 requirements.
6.How does Aetrix verify that AP1635SG-13 is sourced from the original manufacturer or authorized distributors?
All AP1635SG-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 AP1635SG-13 meets industry standards.
7.What is the process for return or replacement of AP1635SG-13?
All AP1635SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1635SG-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 AP1635SG-13 part is unused and in its original packaging.
Return procedure for AP1635SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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