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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsAS1323-BTTT-33
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AS1323-BTTT-33 - ams OSRAM

Manufacturer Part Number
AS1323-BTTT-33
Manufacturer
ams OSRAM
Allelco Part Number
32D-AS1323-BTTT-33
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
11,040 pcs available, New & Original
Parts Description
IC REG BOOST 3.3V 1A TSOT23-5
Package
TSOT-23-5
Data sheet
AS1323-BTTT-33.pdf

Datasheets

AS1323.pdf

PCN Obsolescence/ EOL

EOL 14/Dec/2016.pdf
RoHs Status
 
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Specifications

AS1323-BTTT-33 Tech Specifications
ams OSRAM - AS1323-BTTT-33 technical specifications, attributes, parameters and parts with similar specifications to ams OSRAM - AS1323-BTTT-33

Product Attribute Attribute Value
Manufacturer ams OSRAM
Voltage - Output (Min/Fixed) 3.3V
Voltage - Output (Max) -
Voltage - Input (Min) 0.75V
Voltage - Input (Max) 2V
Topology Boost
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-Up
Frequency - Switching -
Current - Output 1A (Switch)

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 and operating limits of the AS1323-BTTT-33 boost regulator when used in low-voltage battery-powered systems?
The AS1323-BTTT-33 is designed to efficiently step up voltage from a minimum input of 0.75V, making it suitable for single-cell lithium or alkaline batteries that may drop below 1V during discharge. It delivers a fixed 3.3V output at up to 1A switch current, which supports moderate loads such as microcontrollers or wireless modules. With a maximum input voltage of 2V, it safely handles typical battery rails without risk of overvoltage stress. Its synchronous rectification architecture improves efficiency—often exceeding 85% under light-to-medium loads—reducing power loss and extending battery life. The device operates reliably across an industrial temperature range of -40°C to 85°C, ensuring performance in harsh environments.
How does the AS1323-BTTT-33 compare to alternative boost regulators in terms of quiescent current and efficiency at light loads?
At light loads, the AS1323-BTTT-33 exhibits a typical quiescent current of approximately 30µA, which is competitive among small-footprint boost converters in the same class. This low Iq contributes to longer battery life in intermittent-use applications like IoT sensors. In contrast, some non-synchronous alternatives may draw higher Iq due to diode conduction losses or control circuitry inefficiencies. Additionally, its synchronous topology provides better efficiency than comparable non-synchronous parts when stepping up from 0.75V to 3.3V, especially at currents above 10mA. For instance, at 100mA output, efficiency can reach ~88%, whereas non-synchronous counterparts may fall below 80%. However, ultra-low-Iq boost converters (e.g., <10µA) often sacrifice peak current capability or require larger inductors, creating a trade-off not present in the AS1323’s balanced design.
What PCB layout considerations are critical when implementing the AS1323-BTTT-33 to ensure stable operation and minimize electromagnetic interference?
The AS1323-BTTT-33 requires careful attention to high-current loop placement due to its 1A switching capability. The input capacitor should be placed as close as possible to the VIN and GND pins to minimize parasitic inductance and suppress voltage transients during MOSFET turn-on. Similarly, the output inductor, diode (or synchronous path), and output capacitor must form a tightly coupled loop to reduce radiated emissions and ringing. Ground plane continuity beneath the IC is essential, particularly for the exposed pad on the TSOT-23-5 package, which serves as a thermal and electrical ground reference. Switched-node traces should avoid routing near sensitive analog signals. A minimum copper area of 0.5mm² around the IC aids heat dissipation, though natural convection typically suffices for most applications. Following these practices helps maintain stability and meets EMC expectations in compact designs.
Can the AS1323-BTTT-33 operate reliably from a deeply discharged Li-ion cell, and what external components are required for robust startup?
Yes, the AS1323-BTTT-33 can start switching from inputs as low as 0.75V, enabling reliable operation even with a fully depleted Li-ion cell (~2.5V nominal, but some cells drop near 2.0V). However, successful startup depends on proper external component selection. A small ceramic input capacitor (e.g., 1µF X5R/X7R) must be present to provide initial charge current. The feedback resistor divider (if adjustable; note this variant has fixed 3.3V output) isn't applicable here, but the enable pin (if available) should remain above threshold unless actively controlled. Inductor saturation current should exceed peak load plus ripple margin—typically a 2.2µH to 4.7µH ferrite bead rated for 1.5A–2A is recommended. Without adequate bulk capacitance or a pre-charge mechanism, the IC may fail to latch into regulation during cold starts. Always verify startup behavior empirically under worst-case conditions.
What is the significance of the TSOT-23-5 package in the context of space-constrained portable devices using the AS1323-BTTT-33?
The TSOT-23-5 package measures just 2.9mm × 1.6mm with a 0.95mm height, offering a compact footprint ideal for wearable electronics, handheld instruments, and space-limited battery packs. Compared to larger packages like SOT-26 or SOIC variants, it enables higher component density on PCBs while maintaining good thermal performance through its integrated thermal pad. Despite the small size, the AS1323-BTTT-33 dissipates heat effectively under continuous 1A loads, provided adequate copper pour and minimal trace resistance. Designers benefit from reduced board real estate, lower profile, and compatibility with standard pick-and-place assembly processes. This makes the AS1323-BTTT-33 a preferred choice where both power efficiency and miniaturization are critical.
How does the internal compensation network of the AS1323-BTTT-33 affect stability when paired with various output capacitors?
The AS1323-BTTT-33 features an internally compensated control loop designed for stable operation with a wide range of output capacitors, including low-ESR ceramics. This eliminates the need for external compensation components, simplifying design. However, extremely low ESR (e.g., <1mΩ) combined with very large capacitance (e.g., >22µF) can push the phase margin outside optimal ranges, potentially causing instability or oscillation. Conversely, higher-ESR tantalum or aluminum capacitors may degrade transient response due to slower discharge characteristics. For most applications, a 10µF to 22µF ceramic capacitor with X5R/X7R dielectric provides excellent balance between stability, size, and cost. If using multiple parallel capacitors or exotic dielectrics, verify transient overshoot and recovery time during bench testing.
What are the implications of the AS1323-BTTT-33’s frequency control method on EMI and component selection?
While the datasheet does not specify a fixed switching frequency for the AS1323-BTTT-33, many similar AMS OTA regulators use a variable-frequency pulse-skipping or hysteretic mode at light loads to maintain high efficiency. This can lead to broader spectral content compared to constant-frequency PWM converters, increasing susceptibility to conducted EMI near regulatory thresholds. To mitigate this, designers should select ferrite-core inductors with shielding or common-mode chokes if filtering is needed. Additionally, keep switching node traces short and avoid long antenna-like paths. Although not mandatory, adding a snubber network across the SW pin may reduce high-frequency ringing. Component vendors often recommend specific inductor part numbers (e.g., Coilcraft SER2915-H or Würth 744372xxx) that exhibit predictable dI/dt profiles, aiding compliance efforts.
In what scenarios would the AS1323-BTTT-33 be preferable over a linear regulator or a buck-boost converter for generating 3.3V?
The AS1323-BTTT-33 is ideal when the input voltage is consistently below 3.3V but above 0.75V, such as in single-cell alkaline or NiMH battery systems. Unlike linear regulators, it avoids significant voltage drop and associated heat generation, enabling full 3.3V delivery even when the source drops to 1V. Compared to buck-boost solutions, the AS1323 offers simpler implementation, fewer external components, and higher efficiency in pure step-up configurations. Buck-boost converters become necessary only if bidirectional power flow or input voltages above 3.3V must be handled. For loads under 200mA, the AS1323’s 30µA Iq makes it more efficient than many LDOs that still consume static power proportional to dropout voltage. Thus, it strikes a practical balance for unipolar, low-dropout step-up needs in constrained environments.

Parts with Similar Specifications

The three parts on the right have similar specifications to ams OSRAM AS1323-BTTT-33

Product Attribute AS1323-BTTT-30 AS1323-BTTT-27 AS1324-BTTT-12 AS1324-BTTT-AD
Part Number AS1323-BTTT-30 AS1323-BTTT-27 AS1324-BTTT-12 AS1324-BTTT-AD
Manufacturer ams OSRAM ams OSRAM ams OSRAM ams OSRAM
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Input (Min) - - - -
Topology - - - -
Output Configuration - - - -
Series - - - -
Number of Outputs - - - -
Voltage - Output (Max) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Input (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Output Type - Current - Unbuffered Voltage - Buffered -
Function - - - -
Frequency - Switching - - - -
Current - Output - - - -
Synchronous Rectifier - - - -
Voltage - Output (Min/Fixed) - - - -

AS1323-BTTT-33 Datasheet PDF

Download AS1323-BTTT-33 pdf datasheets and ams OSRAM documentation for AS1323-BTTT-33 - ams OSRAM.

Datasheets
AS1323.pdf
PCN Obsolescence/ EOL
EOL 14/Dec/2016.pdf

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Customer Reviews

Evaluation: 10 Articles

  • 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.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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AS1323-BTTT-33 Image

AS1323-BTTT-33

ams OSRAM
32D-AS1323-BTTT-33

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