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Microchip Technology MIC3385-1.5YHL-TR
- Part No.:
- MIC3385-1.5YHL-TR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-VFDFN Exposed Pad, 14-MLF®
- Datasheet:
-
MIC3385-1.5YHL-TR.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 14MLF
- Quantity:
- Payment:
- Shipping:
Inventory:1,883
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Product details
Overview
MIC3385-1.5YHL-TR from Micrel is a fixed 1.5V, 600mA inductorless buck regulator with integrated LOWQ® LDO standby mode, operating from 2.7V–5.5V input and delivering 18µA quiescent current in LDO mode. It features 8MHz PWM switching, 100% duty cycle capability, and ultra-low 75µVrms output noise-designed for battery-powered portable devices requiring high efficiency and low-noise power delivery.
For engineers reviewing the MIC3385-1.5YHL-TR datasheet, MIC3385-1.5YHL-TR pinout, MIC3385-1.5YHL-TR application, or MIC3385-1.5YHL-TR equivalent, this page delivers verified package mapping (14-pin 3mm × 3.5mm MLF®), confirmed dual-mode operation (PWM/LDO), real-world load regulation (0.2% PWM / 0.1% LDO), thermal shutdown at 160°C, and validated alternative options for portable power system design.
Technical Context
The MIC3385-1.5YHL-TR integrates fully synchronous MOSFETs and internal compensation to enable inductorless operation using an embedded 0.47µH inductor. Its architecture supports seamless handoff between 8MHz PWM mode (up to 600mA) and LOWQ® LDO mode (up to 60mA, 18µA IQ), triggered by logic-level control on the LOWQ pin.
It employs type III internal compensation optimized for 10µF output capacitance, with AVIN decoupled via internal 6Ω resistor to isolate analog circuitry from VIN switching noise. The FB pin references a precise 1.0V internal bandgap, enabling accurate fixed 1.5V output without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±2% over –40°C to +125°C junction range |
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, Li-polymer, and 3.3V/5V rail inputs |
| Max Output Current | 600mA in PWM mode; 60mA in LOWQ® LDO mode - enables dynamic load scaling |
| Quiescent Current | 18µA in LOWQ® LDO mode - extends battery life during system sleep/standby |
| Switching Frequency | 8MHz ±10% - allows use of tiny 0.47µH inductor and minimizes EMI filtering needs |
| Output Noise | 75µVrms (10Hz–100kHz) in LDO mode - eliminates spurious ripple seen in PFM/burst-mode regulators |
| Duty Cycle Range | 0–100% - supports low-dropout operation down to VIN = VOUT + 110mV |
Pinout & Package
Package: 14-pin 3mm × 3.5mm × 0.9mm MLF® (Pb-free, NiPdAu lead finish, halogen-free mold compound), rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Monitors regulated 1.5V output via internal 1.0V reference; unused in fixed-output variant but internally connected |
| 2 (VIN) | Main Power Input | Supplies high-current PWM switches; requires ≥1µF X5R/X7R ceramic bypass to GND |
| 3 (LOWQ) | Mode Control Input | Logic-low (<0.5V) enables LDO mode; logic-high (>1.5V) enables 8MHz PWM mode |
| 4 (EN) | Enable Input | Active-high; <0.5V shuts down device to <5µA; open-drain compatible with pull-up |
| 5–7 (OUT) | Switched Output Node | High-current PWM output path to inductor; paralleled pins reduce resistance and thermal rise |
| 8–10 (SW) | Internal Switch Node | Connects to inductor input; high dv/dt node requiring careful PCB routing away from sensitive traces |
| 11 (GND) | Power Ground | Common return for PWM current paths; must be low-impedance plane tied to PGND/SGND |
| 12 (AVIN) | Analog Supply Input | Powered via internal 6Ω resistor from VIN; supplies LDO and bias circuitry - must be decoupled |
| 13 (LDO) | LDO Output Terminal | Delivers clean 1.5V in LOWQ® mode; high-impedance in PWM mode - directly connected to VOUT |
| 14 (BIAS) | Bias Circuit Supply | Internally filtered supply for control/reference circuits; requires 0.1µF ceramic to GND, no external load |
Key Features
| Feature | Design Value |
|---|---|
| No external inductor required | Integrates 0.47µH inductor - reduces BOM count, board area, and EMI susceptibility |
| LOWQ® dual-mode operation | Automatically transitions between 600mA PWM and 60mA/18µA LDO modes based on LOWQ pin state |
| Ultra-low noise LDO output | 75µVrms output noise - avoids interference with RF, audio, and precision analog circuits |
| 100% duty cycle capability | Supports dropout as low as 110mV at 50mA - maintains regulation near battery end-of-life |
| Fully integrated protection | Includes thermal shutdown (160°C), overcurrent limit (0.75–1.85A), and UVLO (2.55V typ) |
Applications
| Slim Digital Cameras | USB Peripherals |
|---|---|
Use Scenario: Powering image sensor, ISP, and flash LED in space-constrained camera modules. IC Role / Device Role / Timing Role: Primary 1.5V power supply with fast transient response to handle burst-mode sensor readout. Use Value: LOWQ® mode extends standby time; 75µVrms noise prevents image sensor pattern noise and color artifacts. |
Use Scenario: Regulating 1.5V for USB PHY, microcontroller core, and EEPROM in compact dongles or hubs. IC Role / Device Role / Timing Role: Single-chip DC-DC solution replacing discrete buck + LDO combos. Use Value: 8MHz switching allows miniature passive components; 100% duty cycle sustains operation as USB VBUS sags to 4.4V. |
| MP3 Players | Cellular Phones (Baseband/Modem) |
Use Scenario: Supplying DSP core and DAC in portable audio players with multi-hour battery life. IC Role / Device Role / Timing Role: High-efficiency voltage source with seamless low-power mode entry/exit. Use Value: 18µA LDO quiescent current minimizes idle drain; ultra-fast load transient response prevents audio clipping during playback start. |
Use Scenario: Delivering stable 1.5V to baseband processor I/O or modem subsystem during intermittent data bursts. IC Role / Device Role / Timing Role: Low-noise, high-PWM-efficiency regulator co-located near RF-sensitive ICs. Use Value: SW node isolation and LDO mode eliminate switching noise coupling into cellular receive bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator with LDO standby applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62740DRYR | 300mA max output, 3.6MHz switching, 360nA shutdown current; no integrated inductor | Lower current capacity; better for ultra-low-IQ sensor nodes than high-throughput audio/video | Select when sub-1µA shutdown and smaller solution size outweigh 600mA requirement |
| Analog Devices ADP5062ACBZ-1.5-R7 | 600mA buck + 300mA LDO; 2.5MHz switching; external inductor; 25µA LDO IQ | Requires external inductor and more board area; higher LDO noise (120µVrms) | Choose when design already uses external magnetics and needs independent LDO enable control |
Compared with TPS62740DRYR and ADP5062ACBZ-1.5-R7, the MIC3385-1.5YHL-TR uniquely combines integrated 0.47µH inductance, 600mA PWM + 60mA LDO dual-mode operation, and industry-leading 75µVrms LDO noise - making it optimal for noise-sensitive, space-constrained portable systems where inductor elimination is critical.
Availability
MIC3385-1.5YHL-TR is available at Aetrix Electronics and suitable for slim digital cameras, USB peripherals, and MP3 players requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC3385-1.5YHL-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 semiconductor company specializing in power management, timing, and interface ICs, acquired by Microchip Technology in 2015.
The MIC3385 product line was designed specifically for portable battery-powered applications demanding ultra-low-noise, inductorless DC-DC conversion with intelligent light-load efficiency optimization.
FAQ
What is the output voltage tolerance of the MIC3385-1.5YHL-TR across temperature and load?
The MIC3385-1.5YHL-TR delivers a fixed 1.5V output with ±2% tolerance over the full –40°C to +125°C junction temperature range and under all specified load conditions. This is guaranteed by its internal 1.0V feedback reference with ±1% initial accuracy and ±2% drift over temperature, ensuring stable rail performance in consumer and industrial portable environments.
Does the MIC3385-1.5YHL-TR require external compensation components?
No, the MIC3385-1.5YHL-TR uses type III internal compensation optimized for a 10µF output capacitor. External compensation is not required or supported. Adding external components may destabilize the control loop; the datasheet explicitly recommends only a 10µF X5R/X7R ceramic output capacitor and optional 10nF high-frequency bypass near the load.
How does the LOWQ pin control mode transition in the MIC3385-1.5YHL-TR?
The LOWQ pin is a logic-controlled input: pulling it below 0.5V enables LOWQ® LDO mode (18µA IQ, 60mA output); pulling it above 1.5V enables 8MHz PWM mode (600mA output). The transition is seamless with no output voltage glitch - the LDO "hands off" to the PWM regulator while maintaining regulation within 0.1% of nominal 1.5V.
What is the maximum allowable input voltage for the MIC3385-1.5YHL-TR?
The absolute maximum input voltage for the MIC3385-1.5YHL-TR is +6V on the VIN and AVIN pins. However, the recommended operating range is 2.7V to 5.5V. Exceeding 5.5V risks violating the device's safe operating area and may trigger overvoltage protection or cause permanent damage, even if within the absolute maximum rating.
Can the MIC3385-1.5YHL-TR operate without an external inductor?
Yes - the MIC3385-1.5YHL-TR is an inductorless buck regulator that integrates a 0.47µH inductor internally. No external inductor is required, enabling ultra-compact designs. The internal inductor is co-packaged and thermally coupled to the die, eliminating layout sensitivity and reducing EMI compared to discrete inductor solutions.
MIC3385-1.5YHL-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-VFDFN Exposed Pad, 14-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 8MHz
- Voltage/Current - Output 1:
- 1.5V, 1A
- Voltage/Current - Output 2:
- 1.5V, 120mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-MLF® (3x3.5)
MIC3385-1.5YHL-TR FAQ
1.How can I place an order for MIC3385-1.5YHL-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3385-1.5YHL-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 MIC3385-1.5YHL-TR reliable?
The price and inventory of MIC3385-1.5YHL-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3385-1.5YHL-TR is usually 5 days.
3.What payment methods are accepted for MIC3385-1.5YHL-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3385-1.5YHL-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3385-1.5YHL-TR?
MIC3385-1.5YHL-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3385-1.5YHL-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 MIC3385-1.5YHL-TR?
For technical support, including MIC3385-1.5YHL-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3385-1.5YHL-TR requirements.
6.How does Aetrix verify that MIC3385-1.5YHL-TR is sourced from the original manufacturer or authorized distributors?
All MIC3385-1.5YHL-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 MIC3385-1.5YHL-TR meets industry standards.
7.What is the process for return or replacement of MIC3385-1.5YHL-TR?
All MIC3385-1.5YHL-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3385-1.5YHL-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 MIC3385-1.5YHL-TR part is unused and in its original packaging.
Return procedure for MIC3385-1.5YHL-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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