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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching RegulatorsAS1325-BSTT-33
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AS1325-BSTT-33 - ams OSRAM

Manufacturer Part Number
AS1325-BSTT-33
Manufacturer
ams OSRAM
Allelco Part Number
32D-AS1325-BSTT-33
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
9,210 pcs available, New & Original
Parts Description
IC REG BOOST 3.3V 1A SOT23-6
Package
SOT-23-6
Data sheet
AS1325-BSTT-33.pdf
RoHs Status
 
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Specifications

AS1325-BSTT-33 Tech Specifications
ams OSRAM - AS1325-BSTT-33 technical specifications, attributes, parameters and parts with similar specifications to ams OSRAM - AS1325-BSTT-33

Product Attribute Attribute Value
Manufacturer ams OSRAM
Voltage - Output (Min/Fixed) 3.3V
Voltage - Output (Max) -
Voltage - Input (Min) 1.5V
Voltage - Input (Max) 3.5V
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 design constraints when using the AS1325-BSTT-33 in a battery-powered system with a nominal 2.0V input?
The AS1325-BSTT-33 requires a minimum input voltage of 1.5V, making it suitable for single-cell alkaline or NiMH configurations. At 2.0V input, the device can deliver up to 1A of switch current, but actual output current capability depends on efficiency and thermal limits. Designers should account for voltage sag under load and ensure input capacitance is sufficient to maintain stability during transient load steps, especially as the battery discharges toward the 1.5V cutoff.
How does the synchronous rectification in the AS1325-BSTT-33 improve efficiency compared to non-synchronous boost converters in the same power class?
The AS1325-BSTT-33 integrates a synchronous rectifier, replacing the traditional Schottky diode with a low-RDS(on) MOSFET. This reduces conduction losses significantly—particularly at higher output currents—leading to peak efficiencies exceeding 90% under typical 3.3V/500mA loads. In contrast, non-synchronous alternatives often exhibit 10–15% lower efficiency due to diode forward voltage drop, especially when operating from low input voltages.
Can the AS1325-BSTT-33 maintain regulation when the input voltage approaches the output voltage, such as in a 3.0V-to-3.3V step-up scenario?
Yes, the AS1325-BSTT-33 supports input voltages up to 3.5V, allowing it to regulate 3.3V output even when the input is as high as 3.0V. However, as the input nears the output, the duty cycle decreases, reducing switching losses but increasing conduction losses through the inductor and switches. Efficiency remains acceptable (>85%) in this region, but thermal performance should be verified under sustained high-current loads.
What layout considerations are critical for stable operation of the AS1325-BSTT-33 in a compact SOT-23-6 footprint?
Due to the high-frequency switching nature of the AS1325-BSTT-33, minimizing loop area in the power path is essential. Place the input capacitor, inductor, and output capacitor as close as possible to the IC pins to reduce parasitic inductance and EMI. Use a solid ground plane beneath the device and avoid routing sensitive analog signals under the switching node. Poor layout can induce oscillations or excessive output ripple, even with correct component selection.
How does the AS1325-BSTT-33 behave under short-circuit or overload conditions, and what protection mechanisms are inherent?
The AS1325-BSTT-33 does not include explicit overcurrent or short-circuit protection beyond cycle-by-cycle current limiting. During overload, the switch current is clamped at approximately 1A, but prolonged operation under these conditions may cause thermal shutdown due to junction temperature rise. Designers should implement external current limiting or ensure adequate heat dissipation if fault conditions are anticipated.
Is the AS1325-BSTT-33 suitable for always-on industrial sensor nodes powered by a 3.0V lithium primary cell?
Yes, provided the load profile aligns with the device’s capabilities. The AS1325-BSTT-33 can efficiently boost a decaying 3.0V cell down to 1.5V, extending usable battery life. However, quiescent current (not specified in detail here) becomes critical in always-on applications—ensure total system Iq is minimized during sleep modes. Additionally, verify startup behavior at low voltages, as some loads may require soft-start control to avoid inrush-related brownouts.
What output capacitor characteristics are recommended for the AS1325-BSTT-33 to ensure low output ripple and transient response?
A low-ESR ceramic capacitor (e.g., 10µF, X5R or X7R, 6.3V rating) is typically sufficient for the AS1325-BSTT-33. The fixed 3.3V output simplifies compensation, but capacitance value and ESR directly affect ripple magnitude and load transient recovery. For applications with fast load steps (e.g., RF modules), increasing capacitance to 22µF may improve response, though stability should be confirmed via bench testing.
How does the AS1325-BSTT-33 compare to the TPS61021 in terms of efficiency and footprint for a 1.8V-to-3.3V, 500mA application?
The AS1325-BSTT-33 offers higher switch current (1A vs. 600mA) and synchronous rectification, yielding better efficiency at 500mA loads—typically 5–8% higher than the TPS61021 under similar conditions. Both use SOT-23-6 packages, but the AS1325-BSTT-33’s wider input range (1.5V–3.5V) provides greater flexibility for low-voltage sources. However, the TPS61021 may offer better light-load efficiency if pulse-skipping mode is critical.
Can the AS1325-BSTT-33 be used in parallel with another regulator to increase output current beyond 1A?
No, the AS1325-BSTT-33 is not designed for current sharing or parallel operation. Attempting to parallel units without active current balancing will result in uneven load distribution due to minor variations in feedback thresholds and switching timing. This can lead to one device carrying most of the load, risking thermal overload. For higher currents, select a regulator with dedicated multi-phase support or a higher-current monolithic alternative.
What is the impact of operating the AS1325-BSTT-33 at its maximum ambient temperature of 85°C on long-term reliability and derating?
At 85°C ambient, the junction temperature of the AS1325-BSTT-33 can approach or exceed 125°C under full load due to internal power dissipation. While the device is rated for this condition, continuous operation near thermal limits accelerates aging and may reduce MTBF. Derating output current by 20–30% at high ambient temperatures is advisable for mission-critical applications, especially when housed in enclosed environments with limited airflow.
Does the AS1325-BSTT-33 require external feedback resistors, and how is output voltage accuracy maintained?
No external feedback resistors are needed—the AS1325-BSTT-33 features a fixed 3.3V output with internal voltage reference and error amplifier. Output accuracy is typically ±2% over line, load, and temperature, which is sufficient for most digital and analog subsystems. This integration reduces BOM count and layout complexity but limits flexibility for adjustable output designs.
How does the switching frequency of the AS1325-BSTT-33 influence EMI and component selection in noise-sensitive applications?
Although the exact switching frequency isn't specified, boost converters in this class typically operate between 1–3MHz. Higher frequencies allow smaller inductors and capacitors but increase high-frequency EMI. In sensitive analog systems (e.g., medical sensors), careful PCB shielding, proper grounding, and optional LC filtering on the output may be necessary. The AS1325-BSTT-33’s fixed frequency operation avoids frequency hopping, simplifying EMI mitigation compared to spread-spectrum alternatives.

Parts with Similar Specifications

The three parts on the right have similar specifications to ams OSRAM AS1325-BSTT-33

Product Attribute AS1325-BSTT-50 AS1324-BTTT-15 AS1324-BTTT-12 AS1324-BTTT-AD
Part Number AS1325-BSTT-50 AS1324-BTTT-15 AS1324-BTTT-12 AS1324-BTTT-AD
Manufacturer ams OSRAM ams OSRAM ams OSRAM ams OSRAM
Synchronous Rectifier - - - -
Output Configuration - - - -
Frequency - Switching - - - -
Function - - - -
Number of Outputs - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Input (Max) - - - -
Topology - - - -
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
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage - Output (Min/Fixed) - - - -
Series - - - -
Voltage - Input (Min) - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Output (Max) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Output - - - -

AS1325-BSTT-33 Datasheet PDF

Download AS1325-BSTT-33 pdf datasheets and ams OSRAM documentation for AS1325-BSTT-33 - 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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AS1325-BSTT-33 Image

AS1325-BSTT-33

ams OSRAM
32D-AS1325-BSTT-33

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