My Inquiry
My Account
Microchip Technology MIC5259-3.3BML-TR
- Part No.:
- MIC5259-3.3BML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 6-VDFN Exposed Pad, 6-MLF®
- Datasheet:
-
MIC5259-3.3BML-TR.pdf
- Description:
- IC REG LINEAR 3.3V 300MA 6MLF
- Quantity:
- Payment:
- Shipping:
Inventory:2,256
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC5259-3.3BML-TR from Micrel is a 3.3V, 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 0.01µF bypass capacitor-enabling clean supply for sensitive analog/RF circuitry in portable wireless devices.
For engineers reviewing the MIC5259-3.3BML-TR datasheet, MIC5259-3.3BML-TR pinout, MIC5259-3.3BML-TR application, or MIC5259-3.3BML-TR equivalent, key selection criteria include PSRR (70dB @ 1kHz), thermal shutdown (150°C), TTL-compatible enable input, ceramic-capacitor stability, and 2mm × 2mm MLF® package footprint compatibility.
Technical Context
The MIC5259-3.3BML-TR uses a CMOS pass element with active-clamp shutdown and internal reference bypassing via dedicated BYP pin. Its architecture supports fast transient response and maintains regulation down to zero load while rejecting ripple across 10Hz–10kHz with ≥53dB PSRR even at VIN = VOUT + 0.3V.
It integrates under-voltage lockout, thermal shutdown with 10°C hysteresis, and current limiting (350–475mA). The enable input accepts TTL logic levels (VIL ≤ 0.4V, VIH ≥ 1.6V) and draws ≤1µA in shutdown-reducing system standby power to near-zero.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1.5% initial accuracy ensures stable core/peripheral rail within tight tolerance without external trimming. |
| Max Output Current | 300mA continuous delivery supports baseband processors, RF transceivers, and sensor subsystems in handheld devices. |
| Dropout Voltage | 300mV @ 300mA enables operation from single-cell Li-ion (3.0V min) or dual-cell alkaline supplies with margin. |
| Output Noise | 30µV(rms), 10Hz–100kHz, with 0.01µF BYP capacitor-critical for PLLs, VCOs, and ADC references. |
| PSRR | 70dB @ 1kHz; ≥53dB @ 10kHz-suppresses switching noise from DC/DC converters feeding the LDO input. |
| Quiescent Current | 105µA @ light load and 0.2µA in shutdown-extends battery life in always-on IoT sensors and keep-alive RAM circuits. |
| Enable Logic | TTL-compatible EN pin (VIL ≤ 0.4V, VIH ≥ 1.6V) allows direct interfacing with microcontrollers and PMICs without level-shifting. |
Pinout & Package
Package: 6-pin 2mm × 2mm MLF® (exposed pad), RoHS-compliant, θJA = 90°C/W (min footprint).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable/Shutdown Input | Active-high TTL-compatible control; must be pulled high or low-floating causes indeterminate output state. |
| 2 - GND | Ground Reference | Common return path for input, output, and bias currents; connects to exposed thermal pad for heat dissipation. |
| 3 - IN | Supply Input | Accepts 2.7V–6.0V input; requires 1µF ceramic bypass to GND for stability and high-frequency noise rejection. |
| 4 - OUT | Regulated Output | Delivers 3.3V ±1.5% to load; stable with ≥1µF ceramic capacitor (X7R/X5R dielectric recommended). |
| 5 - NC | No Connect | Internally unconnected; no electrical function-must remain unconnected on PCB. |
| 6 - BYP | Reference Bypass | Connects 0.01µF–1.0µF capacitor to GND to reduce output noise and improve PSRR; optional but critical for RF apps. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30µV(rms) with 0.01µF BYP cap enables use in VCO, LNA, and high-resolution ADC power domains. |
| Active-clamp shutdown | Internal N-MOSFET discharges output capacitor during disable-prevents residual voltage on powered-down peripherals. |
| Ceramic-capacitor stability | Stable with ≥1µF X7R/X5R ceramic output caps (ESR ≤300mΩ); eliminates need for bulky tantalum or electrolytic capacitors. |
| No-load regulation | Maintains 3.3V output with zero load-supports CMOS RAM keep-alive and real-time clock backup without dummy loads. |
| High PSRR at low VIN | ≥53dB PSRR at VIN = VOUT + 0.3V ensures noise rejection even when input supply sags near dropout. |
Applications
| Cellular Transceiver Power | Portable Medical Sensor |
|---|---|
Use Scenario: Powers RF transceiver ICs (e.g., Bluetooth/Wi-Fi SoCs) in smartphones and wearables where supply noise directly impacts EVM and sensitivity. IC Role / Device Role / Timing Role: Low-noise 3.3V LDO supplying VDD_RF and VDD_IO rails; replaces noisier switching regulators in RF sections. Use Value: 30µV(rms) noise and 70dB PSRR prevent reciprocal mixing and phase noise degradation in 2.4GHz receivers. | Use Scenario: Powers analog front-end (AFE) and low-power MCU in battery-operated glucose monitors and pulse oximeters. IC Role / Device Role / Timing Role: Primary 3.3V supply for precision ADC, op-amps, and BLE radio; enabled/disabled by host MCU for duty-cycled operation. Use Value: 105µA quiescent current and 0.2µA shutdown current extend single-CR2032 battery life beyond 12 months. |
| Laptop Subsystem Rail | Industrial Handheld Terminal |
Use Scenario: Supplies display interface (LVDS/TTL) and touch controller in ultrabooks and 2-in-1 tablets with strict EMI limits. IC Role / Device Role / Timing Role: Dedicated low-noise 3.3V rail decoupled from main system DC/DC; BYP pin used with 0.01µF cap for display timing stability. Use Value: 300mV dropout allows operation from 3.6V battery or 5V USB-PD rail with minimal headroom loss. | Use Scenario: Powers barcode scanner engine, RFID reader, and ARM Cortex-M4 MCU in ruggedized warehouse scanners. IC Role / Device Role / Timing Role: Main 3.3V supply with EN controlled by system PMIC; thermal shutdown (150°C) prevents failure during extended scanning bursts. Use Value: 90°C/W θJA in MLF package sustains 300mA output in sealed enclosures without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79533DBVR | 300mA, 3.3V, 175mV dropout @ 300mA; 30µV(rms) noise; SOT-23-5 package (5-pin) | Lower dropout enables tighter input margins; smaller package lacks BYP pin-requires external filtering for RF apps | Select when board space is constrained and noise requirements are moderate; not drop-in due to pin count and missing BYP functionality |
| MCP1700T-3302E/MB | 250mA, 3.3V, 175mV dropout @ 250mA; 35µV(rms) noise; SOT-23-3 package (3-pin, no EN/BYP) | No enable or bypass pins; lower current rating; simpler interface but less flexible for dynamic power management | Select for cost-sensitive, low-complexity designs where always-on operation and basic noise performance suffice |
Compared with TPS79533DBVR and MCP1700T-3302E/MB, the MIC5259-3.3BML-TR uniquely combines 300mA capability, dedicated noise-bypass pin, TTL-enable, and MLF thermal performance-making it optimal for RF-critical, battery-constrained systems requiring both precision and controllability.
Availability
MIC5259-3.3BML-TR is available at Aetrix Electronics and suitable for cellular transceiver power, portable medical sensor rails, and industrial handheld terminal subsystems requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for MIC5259-3.3BML-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 mixed-signal semiconductor company founded in 1978 and acquired by Microchip Technology in 2015; known for high-performance power management and timing solutions.
The MIC5259 family was designed specifically for ultra-low-noise, high-PSRR LDO applications in battery-powered RF and portable electronics-emphasizing ceramic-capacitor compatibility, fast transient response, and zero-load stability.
FAQ
What is the minimum input voltage required for MIC5259-3.3BML-TR to regulate at full 300mA load?
The MIC5259-3.3BML-TR requires a minimum input voltage of 3.6V to maintain regulation at 300mA, based on its 300mV typical dropout voltage (VIN = VOUT + VDROP = 3.3V + 0.3V). Absolute minimum operating input is 2.7V, but output cannot be sustained at rated current below 3.6V.
Can MIC5259-3.3BML-TR operate without the BYP capacitor in non-RF applications?
Yes, the MIC5259-3.3BML-TR functions without the BYP capacitor-the BYP pin may be left open per datasheet. However, omitting the 0.01µF capacitor increases output noise from 30µV(rms) to ~65µV(rms) and reduces PSRR by ~10–15dB, which is acceptable for digital I/O rails but not for RF or precision analog circuits.
Does MIC5259-3.3BML-TR require an input capacitor, and what type is recommended?
Yes, MIC5259-3.3BML-TR requires a minimum 1.0µF ceramic input capacitor (X7R or X5R dielectric) from IN to GND for stability and high-frequency noise suppression. Low-ESR ceramic capacitors are mandatory; aluminum or tantalum types are not recommended due to ESR and ESL limitations.
What is the thermal performance difference between MIC5259-3.3BML-TR and the SOT-23-5 version?
The MIC5259-3.3BML-TR (2mm × 2mm MLF®) has θJA = 90°C/W on a minimum footprint, versus 235°C/W for the SOT-23-5 variant. This 2.6× better thermal resistance allows the MIC5259-3.3BML-TR to deliver full 300mA continuously at higher ambient temperatures without thermal shutdown.
Is the NC pin on MIC5259-3.3BML-TR safe to connect to ground or leave floating?
The NC pin (Pin 5) on MIC5259-3.3BML-TR is internally unconnected and must remain unconnected on the PCB-neither grounded nor tied to any signal. Connecting it may cause unpredictable behavior or damage; the datasheet explicitly prohibits routing or soldering to this terminal.
MIC5259-3.3BML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad, 6-MLF®
- 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):
- 3.3V
- 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:
- 6-DFN (2x2)
MIC5259-3.3BML-TR FAQ
1.How can I place an order for MIC5259-3.3BML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5259-3.3BML-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 MIC5259-3.3BML-TR reliable?
The price and inventory of MIC5259-3.3BML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5259-3.3BML-TR is usually 5 days.
3.What payment methods are accepted for MIC5259-3.3BML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5259-3.3BML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5259-3.3BML-TR?
MIC5259-3.3BML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5259-3.3BML-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 MIC5259-3.3BML-TR?
For technical support, including MIC5259-3.3BML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5259-3.3BML-TR requirements.
6.How does Aetrix verify that MIC5259-3.3BML-TR is sourced from the original manufacturer or authorized distributors?
All MIC5259-3.3BML-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 MIC5259-3.3BML-TR meets industry standards.
7.What is the process for return or replacement of MIC5259-3.3BML-TR?
All MIC5259-3.3BML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5259-3.3BML-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 MIC5259-3.3BML-TR part is unused and in its original packaging.
Return procedure for MIC5259-3.3BML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC5259-3.3BML-TR Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
