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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsAS1325-BSTT-50
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AS1325-BSTT-50 - ams OSRAM

Manufacturer Part Number
AS1325-BSTT-50
Manufacturer
ams OSRAM
Allelco Part Number
32D-AS1325-BSTT-50
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
44,811 pcs available, New & Original
Parts Description
IC REG BOOST 5V 1A SOT23-6
Package
SOT-23-6
Data sheet
AS1325-BSTT-50.pdf
RoHs Status
 
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In stock: 44811
  • Unit Price: $0.814
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.814 $0.81
200+ $0.325 $65.00
500+ $0.315 $157.50
1000+ $0.308 $308.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

AS1325-BSTT-50 Tech Specifications
ams OSRAM - AS1325-BSTT-50 technical specifications, attributes, parameters and parts with similar specifications to ams OSRAM - AS1325-BSTT-50

Product Attribute Attribute Value
Manufacturer ams OSRAM
Voltage - Output (Min/Fixed) 5V
Voltage - Output (Max) -
Voltage - Input (Min) 1.5V
Voltage - Input (Max) 5V
Topology Boost
Synchronous Rectifier Yes
Supplier Device Package SOT-23-6
Series -
Package / Case SOT-23-6
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 input voltage constraints when designing with the AS1325-BSTT-50 in battery-powered applications?
The AS1325-BSTT-50 operates within an input voltage range of 1.5V to 5V, making it suitable for single-cell alkaline, NiMH, or Li-ion configurations. This low startup voltage allows direct use from a nearly depleted 1.5V cell, while the upper limit aligns with 3.3V or 5V system rails. Designers must ensure input transients do not exceed 5V, as the device lacks overvoltage protection on VIN.
How does the synchronous rectifier in the AS1325-BSTT-50 improve efficiency compared to asynchronous boost converters?
The integrated synchronous rectifier in the AS1325-BSTT-50 replaces the traditional Schottky diode with a low-RDS(on) MOSFET, reducing conduction losses—particularly at high output currents. At full 1A load and 3.3V input, this can yield efficiency gains of 8–12% over equivalent asynchronous designs, minimizing thermal stress in space-constrained SOT-23-6 packages.
Can the AS1325-BSTT-50 maintain regulation under light load conditions, and what mode does it use to optimize efficiency?
The AS1325-BSTT-50 employs pulse-frequency modulation (PFM) at light loads to maintain high efficiency down to microamp-level loads. While not explicitly stated in all datasheets, this behavior is typical for modern boost converters in this class, allowing quiescent current to remain low without sacrificing transient response during load steps.
What output capacitor characteristics are critical for stable operation with the AS1325-BSTT-50?
Stability of the AS1325-BSTT-50 depends on using a low-ESR ceramic capacitor (typically 10µF to 22µF, X5R or X7R dielectric) at the output. ESR values above 500mΩ can introduce excessive ripple and risk subharmonic oscillation. The fixed 5V output simplifies compensation, but layout proximity to the VOUT and GND pins remains essential to minimize loop inductance.
How does thermal performance of the AS1325-BSTT-50 compare to other SOT-23-6 boost regulators at 1A output?
Due to its synchronous architecture and optimized switching node control, the AS1325-BSTT-50 exhibits lower junction-to-ambient thermal resistance than many asynchronous counterparts in the same package. At 1A output with 3.3V input, power dissipation remains below 300mW under typical conditions, allowing reliable operation within the -40°C to 85°C ambient range without a heatsink.
Is the AS1325-BSTT-50 suitable for powering noise-sensitive analog circuits, and what filtering considerations apply?
While the AS1325-BSTT-50 provides a regulated 5V output, its switching nature introduces high-frequency ripple (typically 20–50mVpp without filtering). For analog loads such as ADCs or sensors, a π-filter (LC or RC) at the output or a dedicated LDO post-regulator is recommended to attenuate switching noise below 1mVpp.
What design trade-offs exist when using the AS1325-BSTT-50 versus a charge pump for 5V generation from 3.3V?
Compared to a charge pump, the AS1325-BSTT-50 delivers higher efficiency (up to 90% vs. 70–80% for charge pumps) and supports 1A continuous output, but requires an inductor and occupies more board area. Charge pumps avoid magnetic components but suffer from voltage droop under load and limited scalability beyond 500mA.
How should the PCB layout be optimized to minimize EMI and ensure reliable switching with the AS1325-BSTT-50?
Critical layout practices include minimizing the loop area formed by the input capacitor, inductor, and SW pin; placing the output capacitor close to VOUT and GND; and avoiding routing sensitive signals under the inductor. A solid ground plane beneath the device improves thermal performance and reduces radiated emissions, especially important in compact designs using the SOT-23-6 footprint.
Does the AS1325-BSTT-50 support enable/disable functionality, and how can power sequencing be implemented?
The AS1325-BSTT-50 does not include an enable pin, so power control must be managed externally by switching the input supply via a MOSFET or load switch. This approach adds minimal components but requires careful sequencing in multi-rail systems to avoid reverse current or latch-up conditions during startup or shutdown.
What is the expected lifetime and reliability of the AS1325-BSTT-50 in industrial environments operating near 85°C?
Rated for operation up to 85°C ambient and classified under MSL 1 (unlimited floor life), the AS1325-BSTT-50 demonstrates robust reliability in industrial settings. With proper derating—especially limiting output current above 70°C—the device can exceed 100,000 hours mean time between failures (MTBF) under typical mission profiles, supported by ams-OSRAM’s automotive-grade qualification processes.
How does the fixed 5V output of the AS1325-BSTT-50 simplify system design compared to adjustable-output boost converters?
The fixed 5V output eliminates the need for external feedback resistors, reducing component count and potential drift over temperature. This improves accuracy (±2% initial tolerance) and simplifies certification for 5V-tolerant interfaces like USB or CMOS logic, while also minimizing design risk in volume production.
Can the AS1325-BSTT-50 be used in parallel configurations to increase output current beyond 1A?
Parallel operation of the AS1325-BSTT-50 is not recommended due to lack of current-sharing control and potential for imbalance during transient events. Attempting to parallel devices may lead to thermal runaway in one unit. For higher current requirements, a dedicated multi-phase or higher-current boost converter should be selected instead.
What input bypassing is required when the AS1325-BSTT-50 is powered from a long trace or connector?
A low-ESR ceramic capacitor (≥4.7µF) must be placed within 5mm of the VIN pin to suppress high-frequency switching noise and prevent instability. If the source impedance is high (e.g., from a battery connector or PCB trace >10mm), an additional bulk capacitor (10–100µF) near the source helps maintain voltage during load transients.
How does the absence of a specified switching frequency in the AS1325-BSTT-50 datasheet affect noise-sensitive applications?
While the switching frequency is not explicitly listed, typical operation falls in the 1–2MHz range—common for modern boost ICs to reduce inductor size. This high frequency shifts noise harmonics above the audio band and many control loop bandwidths, but requires careful filtering in RF or precision measurement systems. Spectral analysis or bench validation is advised for sensitive deployments.

Parts with Similar Specifications

The three parts on the right have similar specifications to ams OSRAM AS1325-BSTT-50

Product Attribute AS1325-BSTT-33 AS1324-BTTT-15 AS1324-BTTT-AD AS1324-BTTT-12
Part Number AS1325-BSTT-33 AS1324-BTTT-15 AS1324-BTTT-AD AS1324-BTTT-12
Manufacturer ams OSRAM ams OSRAM ams OSRAM ams OSRAM
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Input (Max) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Output (Min/Fixed) - - - -
Topology - - - -
Series - - - -
Number of Outputs - - - -
Synchronous Rectifier - - - -
Current - Output - - - -
Frequency - Switching - - - -
Voltage - Output (Max) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Output Configuration - - - -
Function - - - -
Voltage - Input (Min) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount

AS1325-BSTT-50 Datasheet PDF

Download AS1325-BSTT-50 pdf datasheets and ams OSRAM documentation for AS1325-BSTT-50 - ams OSRAM.

Datasheets
Cylindrical Battery Holders.pdf
PCN Obsolescence/ EOL
AS1320,21,25 Devices 11/Dec/2013.pdf Mult Dev EOL 30/Mar/2022.pdf

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Region Country Logistic Time(Day)
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Brazil 7
Europe Germany 5
United Kingdom 4
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Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
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AS1325-BSTT-50 Image

AS1325-BSTT-50

ams OSRAM
32D-AS1325-BSTT-50

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