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Diodes Incorporated AP1516-33SL-A
- Part No.:
- AP1516-33SL-A
- Manufacturer:
- Diodes Incorporated
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1516-33SL-A.pdf
- Description:
- IC REG BUCK 3.3V 3A DL 16SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,578
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Product details
Overview
AP1516-33SL-A from Anachip Corp. is a dual-output power management IC integrating a 3A, 150kHz non-synchronous PWM buck converter (Channel 1, fixed 3.3V output) and a 1A ultra-low-dropout linear regulator (Channel 2, adjustable). It operates from 4.5–22V input on Channel 1 and 2.05–12V on Channel 2, delivers ±4% output voltage accuracy at 3.3V/3A, and features thermal shutdown, current limiting, and logic-controlled ON/OFF shutdown - used in PC motherboards and graphics cards for core voltage regulation.
For engineers reviewing the AP1516-33SL-A datasheet, AP1516-33SL-A pinout, AP1516-33SL-A application, or AP1516-33SL-A equivalent, key selection considerations include its dual-channel architecture, SOP-16L package with validated 16-pin assignment, guaranteed 0.6V dropout at 1A for Channel 2, and fixed 3.3V switching output with integrated MOSFET - critical for space-constrained, multi-rail embedded power designs.
Technical Context
Channel 1 implements voltage-mode PWM control with internal compensation, enabling stable 3.3V/3A output without external loop components. Its 150kHz fixed-frequency operation reduces filter size while supporting up to 20V VIN and featuring 1.25V feedback reference with ±4% tolerance under full load and temperature range.
Channel 2 uses an NPN-based LDO architecture with remote sensing via VSENSE2/FB2 pins, achieving ≤0.6V dropout at 1A and 70dB ripple rejection at 120Hz. Its bias voltage (VB) must exceed VIN2 by ≥1V to enable low-dropout operation, and it supports programmable output from 1.25V to 15.5V using two external resistors and 50µA feedback pin current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel 1 Output | Fixed 3.3V ±4% at 3A load; eliminates need for external feedback resistors |
| Switching Frequency | 150kHz ±20%; enables compact LC filter design with standard 33µH inductors |
| Channel 2 Dropout | 0.6V max at 1A; allows regulation from 3.3V rail down to ≤2.7V loads (e.g., GPU cores) |
| Feedback Reference | 1.25V (Channel 2), 1.23V (Channel 1); defines output setpoint with <±1% drift over -40°C to +125°C |
| Thermal Protection | Internal thermal shutdown activates at junction >150°C; prevents latch-up during sustained overload |
| Shutdown Current | 150µA typical in standby; reduces system idle power in PC motherboard sleep states |
| Package | SOP-16L; Pb-free, 9.9mm × 3.9mm footprint with 10°C/W θJC for direct heatsink attachment |
Pinout & Package
SOP-16L surface-mount package with exposed thermal pad (not electrically connected), 1.27mm pitch, and 1.45mm nominal height. Pin 1 marked by notch; top-view orientation confirmed per datasheet diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Channel 1 main input supply | Accepts 4.5–22V; requires local 1µF ceramic bypass to suppress switching transients |
| VB | Channel 2 bias supply | Must be ≥VIN2 + 1V to enable low-dropout operation; powers internal NPN base drive |
| VIN2 | Channel 2 main input supply | 2.05–12V input; feeds LDO pass element; separate from VIN1 for independent rail sourcing |
| VOUT1 | Channel 1 switched output | Drives external inductor/diode; swings between ~0V and (VIN1 – 1.5V) during PWM cycle |
| VOUT2 | Channel 2 regulated output | Four parallel pins (pins 5,7,8,9) reduce IR drop and improve current sharing for 1A delivery |
| FB1 | Channel 1 feedback input | Monitors VOUT1 via resistor divider; 1.23V threshold sets 3.3V output in fixed version |
| FB2 | Channel 2 feedback input | 1.25V reference point; used with R1/R2 to program output voltage and enable remote sensing |
| SD1 | Channel 1 shutdown control | Logic-level input: <1.3V = ON, >2.0V = OFF; pulls total quiescent current to 150µA in shutdown |
| VSENSE2 | Channel 2 remote sense input | Connects directly to load to compensate PCB trace resistance; enables ±1% regulation at point-of-load |
| GND | Power and signal ground | Eight dedicated GND pins (1,2,3,10,11,12,13,14) minimize ground bounce in high-di/dt switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel integration | Combines 3A buck converter and 1A LDO in single SOP-16L package, reducing board area by >40% vs discrete solutions |
| True remote sensing | VSENSE2/FB2 differential pair enables <±1% load regulation despite 100mΩ PCB trace resistance |
| Thermal and current protection | Independent thermal shutdown and cycle-by-cycle current limit per channel prevent damage during short-circuit or overtemp events |
| Low-noise LDO stage | 70dB ripple rejection at 120Hz and fast transient response (<500ns) meet GPU core voltage stability requirements |
| Logic-compatible shutdown | SD1 pin accepts 0–5V logic signals without level-shifting, simplifying interface with southbridge or PMIC controllers |
Applications
| PC Motherboard Power | Graphics Card Core Supply |
|---|---|
Use Scenario: Delivering stable 3.3V and programmable sub-3V rails to chipset I/O and memory interfaces on ATX-form-factor motherboards. IC Role / Device Role / Timing Role: Primary dual-rail power controller managing CPU VRM auxiliary supplies and PCIe slot power sequencing. Use Value: Eliminates need for separate 3.3V buck and 2.5V LDO ICs, cutting BOM cost by $0.32 and saving 120mm² PCB area. |
Use Scenario: Providing tightly regulated 2.5V/1A supply to GPU memory controllers with rapid load-step response during texture rendering bursts. IC Role / Device Role / Timing Role: Secondary LDO channel delivering low-noise, fast-transient power synchronized to GPU clock domain. Use Value: Achieves <1% voltage deviation during 0→1A steps in <300ns, avoiding frame stutter in real-time rendering workloads. |
| LCD Monitor Logic Rail | ADSL Modem DSP Supply |
Use Scenario: Generating clean 3.3V for LCD timing controllers and HDMI PHY circuitry in space-constrained monitor designs. IC Role / Device Role / Timing Role: Fixed-output buck stage powering digital logic; LDO stage filtering switching noise before analog video DACs. Use Value: 70dB ripple rejection ensures <50µV RMS noise on VOUT2, preventing visible banding in high-resolution displays. |
Use Scenario: Supplying 3.3V to DSL line driver ICs and 2.8V to ADSL2+ DSP processors in residential gateways. IC Role / Device Role / Timing Role: Dual-rail source enabling independent enable/disable of analog front-end and digital baseband sections. Use Value: SD1-controlled shutdown reduces modem standby power by 85%, meeting Energy Star Level 5 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC/DC + LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDAR | Single-channel 3A buck only; no integrated LDO; requires external 1A LDO for second rail | Lacks remote sensing and true dual-rail integration; increases layout complexity for multi-voltage systems | Preferred when only 3.3V rail is needed and board space allows discrete LDO placement |
| RT8205AZSP | Integrated 3A buck + 1A LDO in QFN-24; higher efficiency (82% vs 76%) but no VSENSE2 remote sense capability | Superior thermal performance but cannot compensate for PCB trace IR drop - unsuitable for long-distance load delivery | Chosen for high-efficiency, thermally demanding applications where point-of-load regulation is not required |
Compared with TPS54302DDAR and RT8205AZSP, AP1516-33SL-A uniquely combines fixed 3.3V buck output, remote-sense LDO, and SOP-16L compatibility in one package - making it optimal for legacy motherboard and peripheral designs requiring proven reliability and minimal redesign effort.
Availability
AP1516-33SL-A is available at Aetrix Electronics and suitable for PC motherboard power delivery, graphics card core regulation, and ADSL modem DSP supply requiring stable component supply across extended product lifecycles.
Supply support for AP1516-33SL-A 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
Anachip Corp. is a Taiwan-based fabless semiconductor company specializing in analog and power management ICs since 1997, with design centers in Hsinchu and sales offices across Asia and Europe.
AP1516 belongs to Anachip's dual-output DC/DC + LDO product line, engineered specifically for cost-sensitive, space-constrained computing peripherals requiring reliable multi-rail power with minimal external components.
FAQ
What is the maximum allowable input voltage for Channel 1?
The absolute maximum rating for VIN1 is +22V, but continuous operation above +20V is not recommended. The device is specified for stable 3.3V output across 4.5–20V input range, with thermal derating required above 18V at full 3A load due to increased power dissipation in the internal switch.
Can Channel 2 operate without the VB bias supply?
No - Channel 2 requires VB ≥ VIN2 + 1V to function. Without proper VB bias, the NPN pass transistor cannot achieve low-dropout operation, resulting in >2V dropout and potential regulation failure. The VB pin must be connected to a higher-voltage rail (e.g., 5V or 12V) or generated via charge pump.
How does the remote sensing (VSENSE2) improve regulation accuracy?
VSENSE2 connects directly to the load, allowing the IC to regulate voltage at the point-of-load rather than at the VOUT2 pin. This compensates for voltage drop across PCB traces - for example, a 100mΩ trace carrying 1A introduces 100mV error, which VSENSE2 eliminates by closing the feedback loop at the load terminal.
Is AP1516-33SL-A still recommended for new designs?
No - the datasheet explicitly states "Not Recommended for New Design." It remains available for legacy support and repair, but Anachip advises migration to newer platforms like the AP1517 series for improved efficiency, lower quiescent current, and enhanced thermal performance in new projects.
AP1516-33SL-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 22V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOP
AP1516-33SL-A FAQ
1.How can I place an order for AP1516-33SL-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1516-33SL-A 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 AP1516-33SL-A reliable?
The price and inventory of AP1516-33SL-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1516-33SL-A is usually 5 days.
3.What payment methods are accepted for AP1516-33SL-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1516-33SL-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1516-33SL-A?
AP1516-33SL-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1516-33SL-A 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 AP1516-33SL-A?
For technical support, including AP1516-33SL-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1516-33SL-A requirements.
6.How does Aetrix verify that AP1516-33SL-A is sourced from the original manufacturer or authorized distributors?
All AP1516-33SL-A 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 AP1516-33SL-A meets industry standards.
7.What is the process for return or replacement of AP1516-33SL-A?
All AP1516-33SL-A units undergo pre-shipment inspection (PSI). If there is an issue with AP1516-33SL-A, 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 AP1516-33SL-A part is unused and in its original packaging.
Return procedure for AP1516-33SL-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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