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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsAS1324-BTTT-18
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AS1324-BTTT-18 - ams OSRAM

Manufacturer Part Number
AS1324-BTTT-18
Manufacturer
ams OSRAM
Allelco Part Number
32D-AS1324-BTTT-18
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
6,870 pcs available, New & Original
Parts Description
IC REG BUCK 1.8V 600MA TSOT23-5
Package
TSOT-23-5
Data sheet
AS1324-BTTT-18.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf
RoHs Status
 
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Specifications

AS1324-BTTT-18 Tech Specifications
ams OSRAM - AS1324-BTTT-18 technical specifications, attributes, parameters and parts with similar specifications to ams OSRAM - AS1324-BTTT-18

Product Attribute Attribute Value
Manufacturer ams OSRAM
Voltage - Output (Min/Fixed) 1.8V
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 thermal considerations when using the AS1324-BTTT-18 buck regulator in a compact SOT-23-5 package?
The AS1324-BTTT-18 operates efficiently within a junction-to-ambient thermal resistance typical of TSOT-23-5 packages, but sustained output currents near 600mA under elevated ambient temperatures may require careful PCB layout. At an input voltage of 5V and output of 1.8V with a load drawing 600mA, the power dissipation is approximately 1.92W (assuming no synchronous rectifier losses). However, due to the low RDS(on) of the internal MOSFETs and high switching frequency of 1.5MHz, actual efficiency typically exceeds 85%. This results in device temperatures staying below 70°C above ambient even at full load, provided adequate copper area is available on both top and bottom layers for heat spreading.
How does the AS1324-BTTT-18 compare to other 1.8V regulators in terms of switching frequency and external component requirements?
Unlike lower-frequency regulators that often require larger inductors and output capacitors, the AS1324-BTTT-18’s fixed 1.5MHz switching frequency enables use of smaller passive components—ideal for space-constrained designs. Compared to similar-pin-count regulators operating at 340kHz or 600kHz, this higher frequency reduces inductor size by up to 60% while maintaining stable operation across the 2.7V to 5.5V input range. This makes it preferable over alternatives like the TPS62260 in applications where board real estate is limited, despite slightly higher electromagnetic interference potential requiring careful routing.
Can the AS1324-BTTT-18 be used in battery-powered devices with variable input voltages down to 2.7V?
Yes, the AS1324-BTTT-18 supports input voltages as low as 2.7V, making it suitable for single-cell Li-ion batteries that can drop to that level during discharge. Its synchronous rectification architecture maintains high efficiency even at light loads and low input-output differentials. For example, when powered from a 3.0V battery delivering 600mA at 1.8V, measured efficiency typically reaches 87–90%, extending battery life compared to asynchronous solutions. The fixed-frequency control loop also ensures stable transient response regardless of input variation within its specified range.
What design trade-offs exist between using the AS1324-BTTT-18 versus a linear regulator for a 1.8V supply in a portable device?
While linear regulators offer simplicity and ultra-low noise, they suffer significant power loss when stepping down from 3.0V to 1.8V at 600mA, dissipating nearly 720mW as heat. In contrast, the AS1324-BTTT-18 achieves much higher efficiency through switching action—typically 85% or more—reducing wasted energy and thermal management burden. However, this comes at the cost of increased EMI, which necessitates proper layout practices such as minimizing loop areas and adding input/output filtering. Thus, the AS1324-BTTT-18 is better suited for longer battery life, whereas linear regulators remain viable only if quiescent current and noise floor are dominant concerns.
Is the AS1324-BTTT-18 suitable for automotive environments requiring extended temperature operation?
No, the AS1324-BTTT-18 has an industrial-grade operating temperature range of -40°C to +85°C (TA), which does not meet the AEC-Q100 Grade 2 requirement of -40°C to +105°C needed for most automotive systems. It may be acceptable in non-critical consumer electronics exposed to environmental stress, but not in engine compartments or under-hood applications. For automotive designs, a qualified variant such as the AS1324-QTTT-18 (if available) or alternative PMICs rated for 125°C would be required.
How does the internal compensation of the AS1324-BTTT-18 simplify external circuit design?
The AS1324-BTTT-18 features internally compensated feedback circuitry, eliminating the need for external compensation networks that are typically required in general-purpose switching regulators. This reduces component count and simplifies PCB layout, particularly beneficial in space-limited applications like wearables or IoT nodes. Designers still must select appropriate inductor and capacitor values based on stability criteria, but phase margin and crossover frequency are already optimized by ams-OSRAM for robust performance across all operating conditions within the datasheet specifications.
What happens to the output voltage ripple when the AS1324-BTTT-18 operates near its minimum input voltage?
Near the minimum input voltage of 2.7V, the duty cycle approaches 67% (for 1.8V output), increasing conduction time per cycle and potentially amplifying output ripple. However, due to the fixed 1.5MHz switching frequency and use of ceramic output capacitors (commonly 10µF X5R/X7R), ripple remains well below 50mV peak-to-peak even at full load. The synchronous rectifier further minimizes diode-related droop, ensuring consistent regulation regardless of input variation. Proper selection of low-ESR MLCCs and sufficient input capacitance mitigates any edge-case ripple increases.
Why might a designer choose the AS1324-BTTT-18 over discrete solutions for generating a 1.8V rail?
Discrete buck converters require multiple external components including drivers, diodes, inductors, and feedback resistors, increasing BOM count, board area, and calibration effort. The AS1324-BTTT-18 integrates these into a monolithic solution with guaranteed performance across temperature and supply variations. With a maximum quiescent current of ~25µA, it supports always-on operation without excessive standby drain. Additionally, its compact SOT-23-5 footprint simplifies automated assembly and reduces mechanical stress in handheld devices, offering reliability advantages over hand-soldered discrete implementations.
How does the Moisture Sensitivity Level (MSL) rating of 1 impact manufacturing handling of the AS1324-BTTT-18?
With an MSL rating of 1 (unlimited), the AS1324-BTTT-18 does not require special dry storage or baking prior to reflow soldering, simplifying inventory logistics and reducing production delays. This aligns with standard surface-mount processing workflows and allows direct handling after unpacking without humidity monitoring, making it ideal for high-volume consumer electronics manufacturers seeking streamlined assembly lines without additional environmental controls.
Can the AS1324-BTTT-18 operate reliably in systems with noisy power rails due to adjacent switching regulators?
Yes, the AS1324-BTTT-18 incorporates robust input filtering and internal voltage reference stability designed to tolerate moderate input transients within its 2.7V to 5.5V range. However, aggressive noise from parallel high-current switchers could still cause instability if input bypassing is inadequate. Adequate bulk capacitance (e.g., 22µF) near the IC combined with low-ESR ceramics close to pins helps suppress ripple coupling. Still, co-located switching stages should employ frequency dithering or shielding if tight tolerance on output cleanliness is required.
What is the significance of the base product number AS1324 in relation to variant selection?
All variants sharing the base product number AS1324 share core architecture and functional characteristics, differing primarily in quality grades, packaging options, or minor electrical tolerances. The AS1324-BTTT-18 represents the standard commercial version in TSOT-23-5 packaging, while suffix changes indicate different lead finishes, moisture sensitivity levels, or extended temperature ranges. Designers should verify exact pinout compatibility and parameter limits across variants before substituting parts in existing layouts to avoid unintended behavior.
How does the 1.5MHz switching frequency affect PCB layout complexity for the AS1324-BTTT-18?
The 1.5MHz operating frequency allows use of smaller inductors and capacitors, but demands tighter layout discipline to minimize parasitic inductance and capacitance. High-speed current loops must be kept short and wide, especially between input capacitor, switch node, and ground plane. Ground return paths should be minimized in resistance to avoid ground bounce, and feedback traces must be routed away from noisy nodes. These constraints increase layout effort compared to lower-frequency designs, though the net reduction in component size often justifies the added routing care.
Is the AS1324-BTTT-18 protected against reverse polarity on the input side?
No, the AS1324-BTTT-18 does not include internal reverse polarity protection. Applying negative voltage or reversing the input beyond the absolute maximum ratings (-0.3V to VIN+0.3V) can damage the device. If reverse polarity risk exists—such as in hot-swappable USB-powered modules—an external P-channel MOSFET or dedicated protection IC should be added upstream of the input capacitor to clamp voltage excursions safely.
What role does synchronous rectification play in the efficiency of the AS1324-BTTT-18 at light loads?
Synchronous rectification replaces the body diode of a traditional buck converter with a low-RDS(on) MOSFET, drastically reducing forward voltage drop and associated conduction losses. Even at light loads (e.g., 100mA), this improves efficiency by 10–15% compared to asynchronous designs. Combined with pulse-skipping or forced-PWM modes (if implemented), it maintains low output ripple and fast transient response, making the AS1324-BTTT-18 suitable for battery-operated devices requiring long sleep-mode durations without sacrificing wake-up performance.
How does the fixed 1.8V output configuration limit flexibility in system design using the AS1324-BTTT-18?
As a fixed-output regulator, the AS1324-BTTT-18 cannot be adjusted post-fabrication, limiting its use to applications requiring exactly 1.8V. Systems needing programmable voltages (e.g., 1.2V, 1.5V, etc.) must either add an external DAC or resistor divider (though this defeats the fixed-output advantage) or select a different part from the family. This trade-off simplifies design but reduces adaptability across multiple platforms, favoring standardization in products like microcontrollers or sensors with strict voltage rails.
What precautions should be taken when evaluating the AS1324-BTTT-18 in prototype breadboards?
Breadboard evaluation is discouraged for switching regulators like the AS1324-BTTT-18 due to excessive parasitic inductance and capacitance introduced by loose connections. Such setups often lead to oscillations, poor regulation, or false efficiency readings. Instead, use a breakout board or custom PCB with controlled impedance paths, proper decoupling near the IC, and adequate thermal relief. Always measure output ripple with an oscilloscope probe grounded via short clip leads to avoid ground loops that distort high-frequency measurements.
How does the ECCN classification EAR99 affect international sourcing of the AS1324-BTTT-18?
Classified under EAR99, the AS1324-BTTT-18 is subject to minimal U.S. export restrictions, allowing relatively unrestricted global distribution and procurement. This facilitates access from international suppliers without complex licensing procedures, supporting supply chain diversification and mitigating regional shortages. However, end-use verification may still apply depending on final application context, though general consumer electronics qualify automatically under standard compliance frameworks.
Can the AS1324-BTTT-18 support dynamic voltage scaling in microcontroller-based systems?
No, because the AS1324-BTTT-18 provides a fixed 1.8V output, it cannot participate in dynamic voltage scaling schemes where the core voltage varies based on processor load. Dynamic scaling requires adjustable regulators or digital PMBus-compatible PMICs. For such applications, designers must pair the AS1324-BTTT-18 with separate voltage supervisor circuits or opt for a configurable alternative, accepting higher BOM complexity if runtime power optimization is essential.

Parts with Similar Specifications

The three parts on the right have similar specifications to ams OSRAM AS1324-BTTT-18

Product Attribute AS1324-BTTT-12 AS1324-BTTT-15 AS1324-BTTT-AD AS1323-BTTT-27
Part Number AS1324-BTTT-12 AS1324-BTTT-15 AS1324-BTTT-AD AS1323-BTTT-27
Manufacturer ams OSRAM ams OSRAM ams OSRAM ams OSRAM
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Topology - - - -
Voltage - Input (Min) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Input (Max) - - - -
Output Configuration - - - -
Voltage - Output (Max) - - - -
Frequency - Switching - - - -
Number of Outputs - - - -
Function - - - -
Series - - - -
Synchronous Rectifier - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Voltage - Output (Min/Fixed) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Current - Output - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C

AS1324-BTTT-18 Datasheet PDF

Download AS1324-BTTT-18 pdf datasheets and ams OSRAM documentation for AS1324-BTTT-18 - ams OSRAM.

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

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Customer Reviews

Evaluation: 10 Articles

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

  • Embe***dMotion
    Aug 5, 2026

    Purchased this DSP controller for a motor control application. Stable processing performance and very good response under varying loads.

  • FPGA***dio
    Jul 30, 2026

    This FPGA handled our logic design without any surprises. Configuration completed quickly and timing met the project requirements.

  • Nord***mbedded
    Jul 20, 2026

    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

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AS1324-BTTT-18 Image

AS1324-BTTT-18

ams OSRAM
32D-AS1324-BTTT-18

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