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Microchip Technology MIC5259-1.5BD5-TR
- Part No.:
- MIC5259-1.5BD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5259-1.5BD5-TR.pdf
- Description:
- IC REG LIN 1.5V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,775
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Product details
Overview
MIC5259-1.5BD5-TR from Micrel is a 1.5V, 300mA CMOS low-dropout linear regulator optimized for ultra-low-noise RF power rails. It delivers 1.5% initial output accuracy, 300mV dropout at full load, and 30µV(rms) output noise with ceramic capacitor support - enabling clean biasing of VCOs, LNAs, and PLLs in battery-powered wireless devices.
For engineers reviewing the MIC5259-1.5BD5-TR datasheet, MIC5259-1.5BD5-TR pinout, MIC5259-1.5BD5-TR application, or MIC5259-1.5BD5-TR equivalent, key selection criteria include its 70dB PSRR at 1kHz, TTL-compatible enable input, thermal shutdown protection, and compatibility with 1µF ceramic output capacitors in space-constrained SOT-23-5 layouts.
Technical Context
The MIC5259-1.5BD5-TR employs a CMOS pass element with active-clamp shutdown and internal reference bypass control via dedicated BYP pin. Its architecture supports fast transient response and maintains regulation down to zero load while rejecting ripple across 10Hz–10kHz.
It operates within 2.7V–6.0V input range and integrates under-voltage lockout, current limiting (475mA typ), and thermal shutdown (150°C trip with 10°C hysteresis). The device draws only 105µA quiescent current at light load and drops to <1µA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±1.5% initial accuracy - ensures stable core bias for low-voltage RF ICs without external feedback. |
| Max Output Current | 300mA continuous - sufficient for powering single-chip transceivers or sensor signal chains. |
| Dropout Voltage | 300mV at 300mA - enables operation from single-cell Li-ion (3.0V min) or two-cell alkaline (3.2V min) sources. |
| Output Noise | 30µV(rms), 10Hz–100kHz - meets stringent spectral purity requirements for RF front-end biasing. |
| PSRR | 70dB at 1kHz - suppresses switching noise from adjacent DC/DC converters in mixed-signal PCBs. |
| Enable Logic | TTL-compatible EN pin (VIH ≥1.6V, VIL ≤0.4V) - allows direct interfacing with microcontroller GPIOs without level-shifting. |
| Quiescent Current | 105µA at 100µA load - minimizes standby power loss in always-on IoT sensor nodes. |
Pinout & Package
Package: 5-pin Thin SOT-23-5 (D5), 2.9mm × 1.6mm footprint, 1.1mm height - compatible with high-density portable PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Supply Input | Accepts 2.7V–6.0V unregulated input; requires 1µF ceramic bypass to GND for stability. |
| 2 (GND) | Ground Reference | Low-impedance return path for regulator and load; must be connected directly to system ground plane. |
| 3 (EN) | Enable/Shutdown Input | Active-high TTL logic input; drives output ON/OFF with near-zero shutdown current (<1µA). |
| 4 (BYP) | Noise Bypass Terminal | Connects 0.01µF capacitor to GND to reduce reference noise and improve PSRR beyond 70dB. |
| 5 (OUT) | Regulated Output | Delivers stable 1.5V to load; requires ≥1µF low-ESR ceramic capacitor for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30µV(rms) enables RF-sensitive analog circuits (e.g., VCOs) without additional filtering. |
| Active-clamp shutdown | Discharges output capacitor during disable, preventing back-powering of downstream circuitry. |
| Ceramic capacitor stability | Stable with 1µF X7R/X5R ceramics - eliminates need for larger, less reliable tantalum or electrolytic caps. |
| High PSRR at low VIN | Maintains 70dB rejection even when VIN = VOUT + 0.3V - critical for battery-voltage droop scenarios. |
| No-load regulation | Remains in regulation with zero load - supports CMOS RAM keep-alive and always-on wake-up circuits. |
Applications
| Cellular Front-End Biasing | Bluetooth/Wi-Fi SoC Core Supply |
|---|---|
|
Use Scenario: Powering LNA, mixer, and VCO stages in GSM/UMTS handset RF modules. IC Role / Device Role / Timing Role: Ultra-low-noise voltage source for analog RF signal chain biasing. Use Value: 30µV(rms) noise prevents phase noise degradation in local oscillator paths. |
Use Scenario: Supplying 1.5V core rail to Bluetooth 5.0 or Wi-Fi 4/5 SoCs in wearables. IC Role / Device Role / Timing Role: Primary low-noise LDO for digital baseband and RF transceiver cores. Use Value: 70dB PSRR isolates SoC from switching noise generated by PMIC DC/DC converters. |
| Industrial Sensor Node Power | Medical Portable Diagnostic Device |
|
Use Scenario: Providing regulated 1.5V to ultra-low-power ADCs and MEMS sensors in battery-operated IIoT nodes. IC Role / Device Role / Timing Role: Precision analog supply with zero-load stability for intermittent sampling. Use Value: 105µA quiescent current extends shelf life of sealed sensor units over multi-year deployments. |
Use Scenario: Delivering clean 1.5V bias to ECG amplifier front-ends and optical pulse oximetry LEDs. IC Role / Device Role / Timing Role: Medical-grade analog power rail with thermal shutdown and current limit safety features. Use Value: Thermal hysteresis (10°C) prevents cycling during sustained high-current LED pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2015PDQNR | 1.5V fixed, 300mA, 16µV(rms) noise, but requires minimum 0.5µF output capacitance and lacks BYP pin. | Superior noise performance but no adjustable bypass path; tighter layout constraints on output cap placement. | Preferred where lowest possible noise dominates over design flexibility and board area. |
| NCP1117ST15T3G | 1.5V fixed, 1A rated, but 120µV(rms) noise, 1.1V dropout, and no enable/shutdown control. | Lacks EN pin and noise-bypass capability; unsuitable for RF or battery-critical designs. | Only suitable for cost-sensitive, non-RF industrial applications where noise and quiescent current are secondary. |
Compared with TPS7A2015PDQNR and NCP1117ST15T3G, the MIC5259-1.5BD5-TR uniquely balances ultra-low noise (30µV), integrated BYP pin for PSRR enhancement, TTL-enable control, and SOT-23-5 compactness - making it optimal for space- and noise-constrained portable RF systems.
Availability
MIC5259-1.5BD5-TR is available at Aetrix Electronics and suitable for cellular front-end biasing, Bluetooth/Wi-Fi SoC core supply, and industrial sensor node power requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for MIC5259-1.5BD5-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Micrel Inc. was a U.S.-based analog and power management semiconductor company founded in 1978 and acquired by Microchip Technology in 2015. It specialized in high-performance LDOs, PMICs, and timing solutions for portable and industrial markets.
The MIC5259-1.5BD5-TR belongs to Micrel's µCap CMOS LDO family, engineered specifically for ultra-low-noise, high-PSRR regulation in battery-powered RF and portable electronics where clean analog supply integrity is critical.
FAQ
What is the maximum input voltage rating for MIC5259-1.5BD5-TR?
The MIC5259-1.5BD5-TR has an absolute maximum input voltage of +7V, but its specified operating input range is +2.7V to +6.0V. Operation above 6.0V violates functional specifications and risks permanent damage. For 1.5V output, the minimum usable input is 1.8V (accounting for 300mV dropout), though the device requires ≥2.7V to guarantee full specification compliance across temperature.
Does MIC5259-1.5BD5-TR require an external bypass capacitor on the BYP pin?
The MIC5259-1.5BD5-TR does not require the BYP pin to be used - it functions correctly with BYP left open. However, connecting a 0.01µF capacitor from BYP to GND reduces output noise to 30µV(rms) and improves PSRR. Larger values (up to 1.0µF) further lower noise but slightly increase turn-on time; the quick-start circuit mitigates this delay.
Can MIC5259-1.5BD5-TR operate with zero load current?
Yes, the MIC5259-1.5BD5-TR remains stable and in regulation with zero load current - a key differentiator from many older LDO architectures. This feature supports applications like CMOS RAM keep-alive circuits, real-time clock backup supplies, and always-on sensor wake-up logic where load current may drop to zero between measurement cycles.
What is the thermal shutdown behavior of MIC5259-1.5BD5-TR?
The MIC5259-1.5BD5-TR activates thermal shutdown at 150°C junction temperature and includes 10°C hysteresis, meaning it re-enables only after cooling to ~140°C. This prevents rapid on/off cycling during overload. In the SOT-23-5 package (θJA = 235°C/W), safe continuous operation at 300mA requires careful PCB copper area design to avoid exceeding TJ(max) at ambient temperatures above ~50°C.
Is MIC5259-1.5BD5-TR pin-compatible with other MIC5259 variants in the same package?
Yes, all MIC5259-x.xBD5 variants share identical 5-pin Thin SOT-23-5 pinout and footprint. The MIC5259-1.5BD5-TR can be substituted for MIC5259-1.8BD5-TR, MIC5259-2.5BD5-TR, etc., without PCB changes - only the output voltage differs. Electrical characteristics including PSRR, noise, and dropout remain consistent across the BD5 series.
MIC5259-1.5BD5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.55V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 250 µA
- PSRR:
- 65dB ~ 53dB (10Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MIC5259-1.5BD5-TR FAQ
1.How can I place an order for MIC5259-1.5BD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5259-1.5BD5-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MIC5259-1.5BD5-TR reliable?
The price and inventory of MIC5259-1.5BD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5259-1.5BD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5259-1.5BD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5259-1.5BD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5259-1.5BD5-TR?
MIC5259-1.5BD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5259-1.5BD5-TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MIC5259-1.5BD5-TR?
For technical support, including MIC5259-1.5BD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5259-1.5BD5-TR requirements.
6.How does Aetrix verify that MIC5259-1.5BD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5259-1.5BD5-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MIC5259-1.5BD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5259-1.5BD5-TR?
All MIC5259-1.5BD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5259-1.5BD5-TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MIC5259-1.5BD5-TR part is unused and in its original packaging.
Return procedure for MIC5259-1.5BD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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