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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsAS1324-BTTT-15
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AS1324-BTTT-15 - ams OSRAM

Manufacturer Part Number
AS1324-BTTT-15
Manufacturer
ams OSRAM
Allelco Part Number
32D-AS1324-BTTT-15
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
16,520 pcs available, New & Original
Parts Description
IC REG BUCK 1.5V 600MA TSOT23-5
Package
TSOT-23-5
Data sheet
AS1324-BTTT-15.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf
RoHs Status
 
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Specifications

AS1324-BTTT-15 Tech Specifications
ams OSRAM - AS1324-BTTT-15 technical specifications, attributes, parameters and parts with similar specifications to ams OSRAM - AS1324-BTTT-15

Product Attribute Attribute Value
Manufacturer ams OSRAM
Voltage - Output (Min/Fixed) 1.5V
Voltage - Output (Max) -
Voltage - Input (Min) 2.7V
Voltage - Input (Max) 5.5V
Topology Buck
Synchronous Rectifier Yes
Supplier Device Package TSOT-23-5
Series -
Package / Case SOT-23-5 Thin, TSOT-23-5
Product Attribute Attribute Value
Package Tape & Reel (TR)
Output Type Fixed
Output Configuration Positive
Operating Temperature -40°C ~ 85°C (TA)
Number of Outputs 1
Mounting Type Surface Mount
Function Step-Down
Frequency - Switching 1.5MHz
Current - Output 600mA

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

What are the key electrical specifications for the AS1324-BTTT-15 buck regulator, and how do they influence system-level design decisions in low-power embedded applications?
The AS1324-BTTT-15 is a synchronous step-down converter delivering a fixed 1.5V output at up to 600mA with a switching frequency of 1.5MHz. Its input voltage range of 2.7V to 5.5V makes it suitable for battery-powered systems using Li-ion or alkaline cells. The high switching frequency enables the use of small external inductors and ceramic capacitors, which is critical in space-constrained designs such as wearables or IoT sensors. The inclusion of synchronous rectification improves efficiency—typically by 85–90% under moderate loads—reducing heat generation and extending battery life. Designers must ensure that input capacitance and inductor selection meet ripple requirements, particularly when operating near the minimum 2.7V input, where duty cycle approaches 100%.
How does the AS1324-BTTT-15 compare to alternative regulators like the AP64200 or MP2307 when targeting compact, high-efficiency DC-DC conversion in handheld devices?
While the AS1324-BTTT-15 operates at 1.5MHz and offers a 1.5V fixed output, alternatives like the AP64200 (1MHz, 1.2V/3A) and MP2307 (3.3MHz, adjustable 0.8V–16V) serve different design trade-offs. The AS1324’s higher frequency allows smaller passives but may increase switching losses at full load compared to lower-frequency parts. In contrast, the MP2307’s adjustable output and higher switching speed favor ultra-compact designs requiring flexibility, whereas the AS1324’s fixed 1.5V output simplifies PCB layout for microcontrollers that natively operate at this rail. For a 600mA application with tight board area and no need for output adjustment, the AS1324 provides a balanced profile between efficiency, size, and ease of implementation.
What considerations apply when selecting input bypass capacitors for the AS1324-BTTT-15 in a noisy industrial environment?
In industrial settings with potential voltage transients or EMI, input bypassing is essential to maintain stability and prevent false triggering. A low-ESR ceramic capacitor of 1µF or greater should be placed within 1mm of the VIN pin. Additionally, a bulk capacitor (e.g., 4.7µF X5R/X7R) may be used to handle transient current demands during switching events. The AS1324’s internal soft-start circuitry helps limit inrush current, but robust input filtering ensures reliable operation across the full -40°C to 85°C range. Proper grounding of the capacitor return path minimizes ground bounce, which can affect feedback accuracy and cause output droop during rapid load changes.
Can the AS1324-BTTT-15 operate reliably from a single-cell lithium polymer battery throughout its discharge cycle?
Yes, the AS1324-BTTT-15 supports operation from a fully charged 4.2V LiPo cell down to approximately 3.0V—well above its 2.7V minimum input voltage. As the battery discharges below 3.6V, the input-to-output differential decreases, increasing the duty cycle and potentially reducing efficiency slightly due to higher conduction losses. However, at typical mid-discharge voltages (around 3.7V), the part maintains over 88% efficiency at 500mA load. This performance profile makes it viable for applications requiring stable 1.5V rails even as battery voltage drops, though designers should verify thermal performance under worst-case conditions near the lower input limit.
What are the implications of the AS1324-BTTT-15’s 1.5MHz switching frequency on electromagnetic compatibility (EMC) in nearby RF circuits?
Operating at 1.5MHz places the AS1324’s switching harmonics in a region that can interfere with certain wireless bands, such as narrowband ISM frequencies around 1.6MHz or GPS L1 signals if not properly managed. To mitigate coupling, keep the power stage isolated from sensitive analog or RF traces, use a shielded inductor, and implement careful PCB layout with short power loops. Adding a small ferrite bead in series with the output can help suppress high-frequency noise before it radiates. Layout symmetry and ground plane integrity are especially important given the TSOT-23-5 package’s limited pin count; poor decoupling may lead to audible noise in piezoelectric components or glitches in ADC measurements.
How does the synchronous rectifier in the AS1324-BTTT-15 impact thermal management compared to an asynchronous design?
Synchronous rectification replaces the traditional diode with a low-RDS(on) MOSFET, significantly reducing conduction losses—especially noticeable at higher currents or elevated ambient temperatures. For the AS1324-BTTT-15 delivering 600mA at 1.5V from a 3.7V input, this translates to roughly 20–30mW less power dissipation versus an equivalent asynchronous solution. At full load and 85°C ambient, this difference could mean the difference between staying within the 125°C junction temperature limit or requiring heatsinking. In compact designs where surface-mount packaging dominates, the improved thermal headroom allows closer component placement without sacrificing reliability.
Is the AS1324-BTTT-15 suitable for automotive applications requiring functional safety compliance?
The AS1324-BTTT-15 is rated for industrial temperature range (-40°C to 85°C TA), which exceeds standard commercial grades but falls short of AEC-Q100 qualification required for most automotive systems. While it may be used in non-critical auxiliary circuits, it is not recommended for primary power regulation in safety-relevant domains such as ADAS or engine control. Designers seeking automotive-grade alternatives should consider parts explicitly tested to AEC-Q100 Grade 2 (up to 105°C) with documented failure modes. The AS1324’s lack of built-in fault protection beyond basic thermal shutdown limits its suitability for harsh environments without additional supervisory circuitry.
What layout precautions are necessary to maintain stability and minimize output ripple when implementing the AS1324-BTTT-15 in a high-current transient environment?
Stability depends heavily on proper placement of the feedback network, input/output capacitors, and inductor. The AS1324 requires a compensation network typically consisting of two resistors and one capacitor connected between FB and SW pins. These components must be located as close as possible to the IC to avoid parasitic inductance that can destabilize the loop. Use wide, short traces for VIN and GND paths, and connect both capacitor grounds directly to the PGND pad underneath the IC. During fast load steps (e.g., from 100mA to 600mA), output capacitance should be sufficient to limit droop; a combination of 10µF low-ESR ceramic plus a small tantalum or polymer cap often yields optimal results. Simulation using SPICE models from ams-OSRAM is advised before finalizing the design.

Parts with Similar Specifications

The three parts on the right have similar specifications to ams OSRAM AS1324-BTTT-15

Product Attribute AS1324-BTTT-12 AS1324-BTTT-18 AS1324-BTTT-AD AS1323-BTTT-27
Part Number AS1324-BTTT-12 AS1324-BTTT-18 AS1324-BTTT-AD AS1323-BTTT-27
Manufacturer ams OSRAM ams OSRAM ams OSRAM ams OSRAM
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Function - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Frequency - Switching - - - -
Topology - - - -
Voltage - Output (Min/Fixed) - - - -
Voltage - Input (Min) - - - -
Series - - - -
Current - Output - - - -
Voltage - Output (Max) - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Input (Max) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Output Configuration - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Number of Outputs - - - -
Synchronous Rectifier - - - -

AS1324-BTTT-15 Datasheet PDF

Download AS1324-BTTT-15 pdf datasheets and ams OSRAM documentation for AS1324-BTTT-15 - ams OSRAM.

Datasheets
Cylindrical Battery Holders.pdf
PCN Obsolescence/ EOL
Cylindrical Battery Holders.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

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AS1324-BTTT-15 Image

AS1324-BTTT-15

ams OSRAM
32D-AS1324-BTTT-15

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