My Inquiry
My Account
Diodes Incorporated AP1512-K5L-U
- Part No.:
- AP1512-K5L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1512-K5L-U.pdf
- Description:
- IC REG BUCK ADJ 2A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,415
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP1512-K5L-U from Diodes Incorporated is a monolithic 50 kHz non-synchronous PWM buck DC/DC converter with integrated 2A switch, fixed 5V output, TO263-5L package, and logic-controlled shutdown-designed for high-efficiency step-down regulation in industrial power supplies and on-card converters.
For engineers reviewing the AP1512-K5L-U datasheet, AP1512-K5L-U pinout, AP1512-K5L-U application, or AP1512-K5L-U equivalent, this device delivers verified 5V ±4% output accuracy at 2A load, 50 kHz ±15% switching frequency, thermal/current protection, and VIN range up to 60V-critical for rugged 12–48V input systems.
Technical Context
The AP1512-K5L-U implements voltage-mode PWM control with internal 1.235V reference and error amplifier, enabling stable feedback without external compensation. Its fixed-frequency oscillator operates at 50 kHz (±15%), allowing use of standard low-cost inductors and capacitors while minimizing EMI concerns typical of higher-frequency converters.
It integrates a 2A N-channel MOSFET switch, thermal shutdown (150°C trip), cycle-by-cycle current limiting (2.5–5.5 A peak), and logic-level ON/OFF control (VIL ≤0.6 V, VIH ≥2.0 V) - all within a single TO263-5L package with exposed metal tab for thermal conduction to PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over 0.2–2 A load and 10–60 V input - ensures stable rail for microcontrollers and sensors without external resistor divider. |
| Switching Frequency | 50 kHz ±15% - enables use of compact 33–47 µH inductors and reduces core loss vs. 20–30 kHz alternatives. |
| Max Output Current | 2 A continuous - supports mid-power applications like industrial I/O modules and motor drivers without external FETs. |
| Input Voltage Range | 4.5 V to 60 V - accommodates wide-input industrial, automotive, and telecom power rails including 24 V and 48 V nominal systems. |
| Efficiency | 83% at VIN = 30 V, VOUT = 5 V, IOUT = 2 A - minimizes thermal load in enclosed enclosures with limited airflow. |
| Shutdown Quiescent Current | 350 µA at VIN = 60 V - enables ultra-low standby power for battery-backed or energy-sensitive systems. |
| Thermal Resistance | θJA = 23 °C/W (with ~3 in² copper) - requires minimum 0.4 in² PCB copper area under tab for safe operation at full load. |
Pinout & Package
AP1512-K5L-U is housed in a surface-mount TO263-5L package with exposed metal tab (GND-connected) for thermal dissipation. The 5-pin layout supports minimal external components: input capacitor, inductor, catch diode, and output capacitor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Positive input supply | Accepts 4.5–60 V; requires local 1 µF ceramic bypass to suppress switching transients and supply peak currents. |
| OUTPUT (Pin 2) | Internal switch drain | Swings between (VIN – 1.5 V) and ≈ –0.5 V; connects to inductor input - keep trace short and minimize copper area to reduce EMI coupling. |
| GND (Pin 3) | Power and signal ground | Common return for internal circuitry, thermal tab, and external components - must be low-impedance connection to large PCB copper pour. |
| FB (Pin 4) | Feedback input | Not used in fixed 5V version (internally tied to reference); left unconnected per datasheet for AP1512-50 variants. |
| SD (Pin 5) | Shutdown control | Logic-compatible input: <0.6 V = ON, >2.0 V = OFF; draws <10 µA - can be driven directly by MCU GPIO or open-collector logic. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A Power Switch | Eliminates need for external MOSFET and gate driver - reduces BOM count, board space, and layout complexity in cost-sensitive designs. |
| Fixed 5V Output with ±4% Tolerance | Meets tight regulation requirements for digital logic rails without trimming resistors - simplifies qualification and production test. |
| Logic-Level Shutdown (SD Pin) | Enables system-level power sequencing and sleep mode control using standard 3.3 V or 5 V logic - no level-shifter required. |
| Thermal Shutdown + Current Limit | Protects against sustained overload and ambient temperature excursions - prevents catastrophic failure during fault conditions or poor heatsinking. |
| Lead-Free / RoHS-Compliant Packaging | TO263-5L with matte tin lead finish meets EU Directive 2002/95/EC - supports global manufacturing compliance without process requalification. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering isolated sensor interfaces and digital I/O drivers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 5V buck regulator converting 24 V DC bus to clean logic supply for microcontrollers and optocouplers. Use Value: 2A capability supports multiple downstream LDOs and isolation ICs; 60 V max input withstands load-dump transients in industrial environments. |
Use Scenario: Generating 5V rail for microcontroller, CAN transceivers, and LED drivers in vehicle door modules and seat controllers. IC Role / Device Role / Timing Role: Non-isolated step-down regulator handling wide automotive battery range (9–16 V nominal, up to 60 V during load dump). Use Value: Built-in thermal shutdown prevents latch-up during under-hood temperature spikes; SD pin enables ECU sleep/wake coordination. |
| Telecom Remote Radio Units | POS Terminal Power Management |
|
Use Scenario: Providing regulated 5V supply for FPGA configuration, RF front-end bias, and monitoring circuits in outdoor small-cell base stations. IC Role / Device Role / Timing Role: High-reliability DC/DC stage converting -48 V or 48 V backplane voltage to 5V logic rail via intermediate boost/buck architecture. Use Value: 50 kHz switching allows use of shielded drum-core inductors with low audible noise - critical for fanless outdoor deployments. |
Use Scenario: Delivering 5V power to payment processing modules, display backlight drivers, and USB peripherals in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Main system regulator operating from 12 V adapter input, supporting burst-mode operation during low-activity periods. Use Value: 350 µA standby current extends battery backup runtime; TO263 thermal performance sustains 2A load in compact plastic enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-5.0/NOPB | 3A rated, 150 kHz switching, requires external compensation network - higher efficiency at light loads but larger solution size. | Preferred where higher current headroom or tighter line regulation (<±2%) is needed; less suitable for space-constrained layouts due to extra RC network. | Select if 3A output or lower quiescent current (<5 mA active) is mandatory; verify thermal design for TO220 footprint vs. TO263 copper spread. |
| MP1584EN-LF-Z | 3A, 1.5 MHz switching, adjustable output only - demands external feedback resistors and has stricter layout sensitivity for EMI control. | Better for compact, high-density boards needing 1.5 MHz operation; not drop-in for fixed 5V - requires redesign of feedback and compensation. | Choose when board area is premium and 1.5 MHz enables smaller magnetics; avoid if fixed 5V simplicity and minimal external parts are top priorities. |
Compared with LM2596S-5.0/NOPB and MP1584EN-LF-Z, AP1512-K5L-U offers lowest component count for fixed 5V conversion, superior thermal performance via TO263 copper conduction, and guaranteed ±4% output tolerance without trimming - ideal for cost-optimized, thermally demanding industrial applications.
Availability
AP1512-K5L-U is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, and telecom remote radio units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP1512-K5L-U 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 high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and computing markets.
The AP1512 product line delivers monolithic buck regulators targeting cost-sensitive, thermally constrained applications where integration, ruggedness, and wide input range outweigh ultra-high efficiency or high-frequency operation.
FAQ
Is AP1512-K5L-U pin-compatible with other AP1512 variants?
Yes - all AP1512 variants (including -33, -50, -12, and -ADJ) share identical TO263-5L pinout and footprint. The K5L-U suffix denotes lead-free tube packaging; electrical differences exist only in output voltage and current rating (2A for non-A versions), not pin function or layout.
What is the minimum recommended PCB copper area for thermal management?
Diodes specifies a minimum of 0.4 in² copper area under the TO263 tab for reliable 2A operation at 85°C ambient. For full derating to 125°C junction temperature, ≥3 in² of 2 oz copper is recommended - verified in thermal characterization data on page 10 of the Rev. 4 datasheet.
Can the FB pin be left floating in the fixed 5V version?
Yes - the AP1512-50 variant (like AP1512-K5L-U) has internal feedback divider; Pin 4 (FB) is not connected internally and must remain unconnected per datasheet Section "Typical Application Circuit (2)" and Pin Description table on page 3.
Does AP1512-K5L-U require an external catch diode?
Yes - it is a non-synchronous buck controller with integrated high-side switch only. A Schottky diode (e.g., B360/B) is mandatory across the inductor to provide freewheeling path; omission causes immediate failure due to inductive kickback at OUTPUT pin.
AP1512-K5L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 2A
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP1512-K5L-U FAQ
1.How can I place an order for AP1512-K5L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1512-K5L-U 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 AP1512-K5L-U reliable?
The price and inventory of AP1512-K5L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1512-K5L-U is usually 5 days.
3.What payment methods are accepted for AP1512-K5L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1512-K5L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1512-K5L-U?
AP1512-K5L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1512-K5L-U 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 AP1512-K5L-U?
For technical support, including AP1512-K5L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1512-K5L-U requirements.
6.How does Aetrix verify that AP1512-K5L-U is sourced from the original manufacturer or authorized distributors?
All AP1512-K5L-U 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 AP1512-K5L-U meets industry standards.
7.What is the process for return or replacement of AP1512-K5L-U?
All AP1512-K5L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1512-K5L-U, 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 AP1512-K5L-U part is unused and in its original packaging.
Return procedure for AP1512-K5L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP1512-K5L-U Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
