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Diodes Incorporated AP5101SG-13
- Part No.:
- AP5101SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP5101SG-13.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
AP5101SG-13 from Diodes Incorporated is a current-mode asynchronous step-down DC-DC converter with integrated 0.35Ω high-side MOSFET, delivering up to 1.5A peak output current across 4.75V–22V input range, fixed 1.4MHz switching frequency, and adjustable output voltage from 0.81V to 15V - deployed in distributed power systems and battery chargers.
For engineers reviewing the AP5101SG-13 datasheet, AP5101SG-13 pinout, AP5101SG-13 application, or AP5101SG-13 equivalent, key selection criteria include feedback reference voltage (0.810V), cycle-by-cycle overcurrent protection threshold (2.5A), thermal shutdown at +150°C, and SO-8 package layout compatibility with external bootstrap and compensation networks.
Technical Context
The AP5101SG-13 implements current-mode control with internal ramp compensation to suppress subharmonic oscillation at half-switching frequency (700kHz), enabling fast load transient response and stable operation with low-ESR ceramic output capacitors. Its error amplifier features 400 V/V gain and 850 µA/V transconductance, referenced to a precision 0.810V feedback voltage.
Operation relies on external components: BST-SW bootstrap capacitor (0.1–100µF), COMP pin RC network for loop stability, FB resistor divider for output setting, and an external Schottky diode for asynchronous rectification. Under-voltage lockout activates below 3.8V with 100mV hysteresis, and shutdown current is limited to 0.1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VFB | 0.810V ±20mV - sets output voltage accuracy via resistor divider; enables 0.81–15V adjustment |
| fSW | 1.4MHz (±300kHz) - enables compact magnetics and low-output-ripple design with <100ns minimum on-time |
| IOUT Peak | 1.5A - maximum continuous output current; current limit triggers at 2.5A for fault protection |
| RDS(ON) | 0.35Ω - low conduction loss supports >92% efficiency at 12V→3.3V/1.5A |
| IQ | 0.7mA typical - quiescent supply current during regulation; drops to 0.1µA in shutdown mode |
| UVLO Threshold | 4.0V ±200mV - prevents erratic startup; hysteresis ensures clean enable/disable transition |
| Thermal Shutdown | +150°C - protects die under overload or poor PCB thermal design; auto-recovery after cooldown |
Pinout & Package
AP5101SG-13 is housed in a standard SO-8 (Small Outline-8) package with exposed pad for thermal enhancement, RoHS-compliant "Green" molding compound, and lead-free terminations per EU Directive 2015/863/EU.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Drives external inductor; serves as return for bootstrap capacitor and reference for high-side gate driver |
| IN (Pin 2) | Input Supply | Accepts 4.75–22V unregulated input; requires local 10µF ceramic decoupling capacitor |
| EN (Pin 3) | Enable Control | Logic-level ON/OFF control: >1.2V = active, <0.4V = shutdown; 100kΩ pull-up to VIN if unused |
| GND (Pin 4) | Signal Ground | Reference for FB, COMP, and EN; must be routed outside high-current D1–C1 path to avoid noise coupling |
| FB (Pin 5) | Feedback Input | Senses output voltage via resistor divider; internal 0.810V reference enables precise output regulation |
| COMP (Pin 6) | Error Amplifier Output | External RC network sets pole-zero placement for loop stability; determines phase margin and crossover frequency |
| BST (Pin 7) | Bootstrap Supply | Connects to SW via 0.1–100µF capacitor to generate floating gate drive voltage for internal MOSFET |
| GND (Pin 8) | Power Ground | High-current return path for internal switch; shares thermal pad with Pin 4 but requires separate low-impedance routing |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Buck Topology | Eliminates need for synchronous MOSFET driver; simplifies BOM with single external Schottky diode |
| Current-Mode Control with Ramp Compensation | Enables stable operation at duty cycles >50%; prevents subharmonic oscillation without external slope injection |
| External Compensation (COMP Pin) | Allows full control of loop dynamics - bandwidth, phase margin, and transient response - via user-selected RC network |
| Thermal & Overcurrent Protection | Integrated +150°C shutdown and cycle-by-cycle current limiting at 2.5A prevent damage under short-circuit or overload |
| Low Quiescent Current | 0.1µA shutdown current extends battery life in portable applications; 0.7mA operating IQ minimizes no-load losses |
Applications
| Distributed Power Systems | Battery Charger |
|---|---|
Use Scenario: Point-of-load conversion in telecom or industrial backplanes where 12V or 24V rails feed multiple subsystems. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 3.3V/1.5A or 5V/1.5A to FPGA I/O banks or microcontroller cores. Use Value: Fixed 1.4MHz switching enables small 4.7µH inductors and 22µF ceramic output caps, reducing board area by >40% vs. lower-frequency alternatives. | Use Scenario: Constant-current/constant-voltage stage in Li-ion or lead-acid battery charging circuits. IC Role / Device Role / Timing Role: Pre-regulator supplying adjustable voltage (e.g., 8.4V for 2S Li-ion) to linear charger ICs like AP3301 or TP4056. Use Value: Wide 4.75–22V input range accepts unregulated wall adapters or automotive sources; 0.81V feedback reference allows precise CV threshold setting. |
| Pre-Regulator for Linear Regulators | WLED Driver |
Use Scenario: Efficient intermediate voltage generation ahead of low-noise LDOs powering analog sensors or RF modules. IC Role / Device Role / Timing Role: High-efficiency step-down stage reducing dropout voltage stress on downstream LDOs (e.g., AP2202K-3.3). Use Value: 92% peak efficiency at 12V→5V/1.5A lowers thermal load on PCB; SO-8 thermal resistance (θJA = 120°C/W) supports passive cooling. | Use Scenario: Constant-current driver for white LED strings in backlighting or indicator applications. IC Role / Device Role / Timing Role: Adjustable constant-voltage source feeding external current-sense resistor or linear LED driver IC. Use Value: Output adjustability (0.81–15V) accommodates varying LED forward voltages; 1.5A capability supports multi-string configurations up to 12W. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z (Monolithic Power) | Fixed 3.3V/5V options only; no adjustable FB reference; 2A rating; integrated diode | Lacks output flexibility; better suited for fixed-rail consumer electronics, not programmable systems | Select when board space is critical and output voltage is fixed; avoid if 0.81V–15V adjustment is required |
| LM2678-5.0/NOPB (Texas Instruments) | 5V fixed output; 5A rating; 260kHz switching; larger SO-8 package with different pinout | Lower frequency demands larger inductors/caps; higher current unnecessary for 1.5A use cases | Choose only for legacy designs requiring pin-for-pin replacement; not recommended for new 1.4MHz designs |
Compared with MP2307DN-LF-Z and LM2678-5.0/NOPB, AP5101SG-13 uniquely balances wide output adjustability, high-frequency operation, and external compensation - making it optimal for space-constrained, thermally sensitive, or dynamically regulated systems where loop tuning and voltage flexibility are essential.
Availability
AP5101SG-13 is available at Aetrix Electronics and suitable for distributed power systems, battery chargers, and pre-regulator applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for AP5101SG-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 power management ICs, specializing in high-efficiency, high-reliability solutions for industrial, computing, and consumer markets.
The AP5101 belongs to Diodes' high-frequency buck converter product line, engineered for compact, thermally efficient point-of-load regulation in space- and performance-constrained applications.
FAQ
What is the minimum recommended output capacitance for stable operation?
The AP5101SG-13 is specified to operate stably with ≥22µF ceramic output capacitance (X5R/X7R, 6.3V rating), as validated in the typical application circuit. Lower values may cause instability or excessive ripple due to insufficient loop damping and transient current sourcing capability.
Can the AP5101SG-13 be used without an external bootstrap diode?
Yes - the AP5101SG-13 operates without an external bootstrap diode when input voltage exceeds 5V, as the internal charge pump sustains sufficient gate drive. However, adding a BAT54 or IN4148 between BST and 5V rail improves efficiency and gate drive robustness at low VIN (≤5V) or high-duty-cycle conditions.
How does the AP5101SG-13 handle short-circuit conditions?
Under short-circuit, the AP5101SG-13 enters hiccup mode: cycle-by-cycle current limiting trips at 2.5A, triggering immediate switch-off; after a brief recovery interval (~50µs), it attempts restart. Thermal shutdown at +150°C provides secondary protection if hiccup fails to clear sustained overload.
Is the SO-8 package thermally enhanced, and what is its θJA value?
Yes - the AP5101SG-13 SO-8 package includes an exposed thermal pad. Its junction-to-ambient thermal resistance is 120°C/W when mounted on a 1-inch square, 1-oz copper PCB per JEDEC standards, enabling 1.5A operation without forced air cooling under typical ambient conditions.
AP5101SG-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:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 22V
- Voltage - Output (Min/Fixed):
- 0.81V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
AP5101SG-13 FAQ
1.How can I place an order for AP5101SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP5101SG-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 AP5101SG-13 reliable?
The price and inventory of AP5101SG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP5101SG-13 is usually 5 days.
3.What payment methods are accepted for AP5101SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP5101SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP5101SG-13?
AP5101SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP5101SG-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 AP5101SG-13?
For technical support, including AP5101SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP5101SG-13 requirements.
6.How does Aetrix verify that AP5101SG-13 is sourced from the original manufacturer or authorized distributors?
All AP5101SG-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 AP5101SG-13 meets industry standards.
7.What is the process for return or replacement of AP5101SG-13?
All AP5101SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP5101SG-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 AP5101SG-13 part is unused and in its original packaging.
Return procedure for AP5101SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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