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STMicroelectronics KF15BDT-TR
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- Part No.:
- KF15BDT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
KF15BDT-TR.pdf
- Description:
- IC REG LINEAR 1.5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,049
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Product details
Overview
KF15BDT-TR from STMicroelectronics is a 1.5 V fixed-output, 500 mA low-dropout linear regulator in SO-8 package with logic-controlled shutdown (TTL-compatible enable pin), 0.4 V dropout at 500 mA, ±2 % output accuracy at 25 °C, and 50 µA quiescent current in OFF mode. It serves as a local power supply for microcontroller I/O rails, sensor analog front-ends, and low-noise RF biasing in battery-powered portable instrumentation.
For engineers reviewing the KF15BDT-TR datasheet, KF15BDT-TR pinout, KF15BDT-TR application, or KF15BDT-TR equivalent, this device is selected for ultra-low quiescent current, minimal external capacitance (2.2 µF), wide input range (2.5–20 V), and thermal/current protection in space-constrained embedded systems requiring stable 1.5 V regulation.
Technical Context
The KF15BDT-TR integrates internal current limiting and thermal shutdown circuitry, with a dedicated TTL-compatible control input (pin 5) enabling system-level power sequencing. Its LDO architecture achieves 0.4 V dropout at full 500 mA load while maintaining stability with only 2.2 µF output capacitance (ESR 0.1–10 Ω).
Supply voltage rejection reaches 82 dB at 120 Hz and remains ≥77 dB up to 1 kHz, supporting noise-sensitive analog circuits. Operating junction temperature spans −40 to +125 °C, and output voltage tolerance is specified over −25 to +85 °C ambient with ±3 % total variation including line/load/temperature effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5 V ±2 % at 25 °C; ensures precise core/bias rail for 1.5 V logic or analog sensors |
| Dropout Voltage | 0.4 V max at 500 mA; enables regulation from 1.9 V input, critical for single-cell Li-ion or coin-cell systems |
| Quiescent Current | 50 µA typ. in OFF mode; reduces standby power to <1 µW per regulator in deep-sleep states |
| Output Current | 500 mA continuous; supports moderate-power peripherals like ADC drivers or small FPGAs |
| Input Voltage Range | 2.5 V to 20 V; accommodates unregulated wall adapters, automotive transients, and multi-cell battery stacks |
| SVR @ 1 kHz | 77 dB typ.; suppresses switching noise from upstream DC/DC converters feeding the LDO input |
| Stability Capacitance | 2.2 µF ceramic output cap (ESR 0.1–10 Ω); eliminates need for bulky tantalum or electrolytic capacitors |
Pinout & Package
Package: SO-8 (Small Outline, 8-pin, surface-mount). Dimensions per JEDEC MS-012, lead-free ECOPACK® compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – IN | Input voltage supply | Accepts 2.5–20 V DC; requires local 0.1 µF ceramic bypass capacitor |
| 2 – GND | Power ground reference | Common return for input/output paths; must be low-impedance connection to PCB ground plane |
| 3 – OUT | Regulated output | Delivers 1.5 V ±2 %; connects to 2.2 µF output capacitor and load |
| 4 – NC | No connect | Internally unused; must remain floating or tied to GND per layout guidelines |
| 5 – CTRL | Enable/shutdown control input | TTL-compatible: <0.8 V = OFF (50 µA IQ), >2 V = ON (500 µA IQ) |
| 6 – NC | No connect | Internally unused; must remain floating or tied to GND per layout guidelines |
| 7 – NC | No connect | Internally unused; must remain floating or tied to GND per layout guidelines |
| 8 – NC | No connect | Internally unused; must remain floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 0.4 V at 500 mA enables operation from marginal input sources (e.g., aging batteries) |
| Logic-controlled shutdown | TTL-compatible CTRL pin allows microcontroller-driven power gating of subsystems |
| Minimal external components | Only 0.1 µF input + 2.2 µF output ceramic caps required-no ESR constraints or compensation networks |
| High PSRR at audio frequencies | 82 dB SVR at 120 Hz suppresses ripple from AC/DC adapters and low-frequency switching noise |
| Robust protection | Internal current limit (1 A) and thermal shutdown prevent damage during overload or ambient extremes |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Powering low-noise analog front-end (AFE) of handheld ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Local 1.5 V bias supply for precision op-amps and delta-sigma ADC reference buffers. Use Value: 50 µV RMS output noise (10 Hz–100 kHz) and 82 dB PSRR preserve signal integrity in sub-µV biomedical measurements. |
Use Scenario: Regulating 1.5 V supply for isolated digital I/O channel ASICs in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Dedicated LDO per I/O group, controlled via FPGA GPIO to reduce system-wide standby current. Use Value: 50 µA OFF-mode IQ enables >10-year battery backup for configuration memory retention during main power loss. |
| Automotive Body Control Units | Wireless Sensor Node Transceivers |
|
Use Scenario: Supplying 1.5 V logic for LIN bus transceiver interface circuitry in door module ECUs. IC Role / Device Role / Timing Role: Post-regulator after 5 V DC/DC converter, providing clean, sequenced power to LIN PHY layer. Use Value: −40 to +125 °C operating range and 20 V max input withstand transient loads per ISO 7637-2 Pulse 1/2a without derating. |
Use Scenario: Biasing 1.5 V VDD_IO of sub-GHz RF SoCs (e.g., TI CC1310) in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Low-noise, low-IQ supply enabling 10-year operation on CR2032 coin cell with duty-cycled radio bursts. Use Value: 0.4 V dropout extends usable battery life by 22% compared to 0.5 V-drop alternatives under 3.0–2.5 V discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70015DCKR | 0.25 V dropout at 200 mA; 30 µA IQ OFF; SOT-23-5 package; no CTRL pin-requires external MOSFET for shutdown | Limited to ≤200 mA loads; lacks integrated enable, increasing BOM count and board area | Select when footprint and ultra-low IQ dominate over current capability and integration |
| MCP1700T-1502E/TT | 6 µA IQ (ON), 0.1 µA (OFF); 170 mA max output; SOT-23-3; no thermal/current protection | Insufficient for 500 mA loads; unprotected operation risks field failure under fault conditions | Select only for micropower sensor nodes drawing <100 mA with strict IQ budget and no fault exposure |
Compared with TLV70015DCKR and MCP1700T-1502E/TT, KF15BDT-TR uniquely delivers 500 mA output, integrated shutdown, and full protection in SO-8-making it optimal for industrial and automotive subsystems where reliability and headroom matter more than minimal footprint.
Availability
KF15BDT-TR is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC I/O modules, automotive body control units, and wireless sensor node transceivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for KF15BDT-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.
The KFxxB series was developed specifically for ultra-low-power, high-reliability embedded systems needing robust LDOs with integrated enable and minimal external components-targeting battery-powered instrumentation and harsh-environment controls.
FAQ
What is the minimum input voltage required for regulation at 500 mA output?
The KF15BDT-TR requires a minimum input voltage of 1.9 V to maintain 1.5 V output at 500 mA load, based on its 0.4 V maximum dropout specification. Below this, output voltage collapses linearly with input; operation below 2.5 V is not guaranteed per datasheet absolute ratings.
Can the CTRL pin be left unconnected in always-on applications?
No. The CTRL pin must be actively driven high (>2 V) for normal operation or pulled low (<0.8 V) for shutdown. Leaving it floating may cause undefined behavior due to internal leakage paths; ST recommends tying CTRL to IN via 100 kΩ resistor if permanently enabled.
Is the 2.2 µF output capacitor mandatory, or can smaller values be used?
The 2.2 µF value is the minimum recommended for guaranteed stability across all operating conditions (load, temperature, input voltage). Using smaller capacitors risks oscillation or poor transient response; ST validates performance only with 2.2–10 µF ceramic caps having ESR between 0.1 Ω and 10 Ω.
Does the ±2 % output voltage tolerance include temperature drift?
No. The ±2 % tolerance applies only at 25 °C. Over −25 to +85 °C ambient, output voltage varies by ±3 % total (including line, load, and temperature effects), as specified in Table 4 for KF15 under "IO = 50 mA, VI = 3.5 V, Ta = −25 to 85 °C" condition.
KF15BDT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 200mA (Typ)
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 82dB ~ 60dB (120Hz ~ 10kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
KF15BDT-TR FAQ
1.How can I place an order for KF15BDT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for KF15BDT-TR 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 KF15BDT-TR reliable?
The price and inventory of KF15BDT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KF15BDT-TR is usually 5 days.
3.What payment methods are accepted for KF15BDT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KF15BDT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KF15BDT-TR?
KF15BDT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KF15BDT-TR 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 KF15BDT-TR?
For technical support, including KF15BDT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KF15BDT-TR requirements.
6.How does Aetrix verify that KF15BDT-TR is sourced from the original manufacturer or authorized distributors?
All KF15BDT-TR 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 KF15BDT-TR meets industry standards.
7.What is the process for return or replacement of KF15BDT-TR?
All KF15BDT-TR units undergo pre-shipment inspection (PSI). If there is an issue with KF15BDT-TR, 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 KF15BDT-TR part is unused and in its original packaging.
Return procedure for KF15BDT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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