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Microchip Technology MIC5238-1.1YD5-TR
- Part No.:
- MIC5238-1.1YD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5238-1.1YD5-TR.pdf
- Description:
- IC REG LIN 1.1V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,779
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Product details
Overview
MIC5238-1.1YD5-TR from Micrel is a fixed 1.1V, 150mA ultra-low-quiescent-current LDO regulator in TSOT-23-5 package, featuring 23µA bias current, 310mV dropout at full load, ±2.0% output accuracy over –40°C to +125°C, and dual-supply operation with separate IN and BIAS inputs-designed for battery-powered microprocessor core supplies in portable electronics.
For engineers reviewing the MIC5238-1.1YD5-TR datasheet, MIC5238-1.1YD5-TR pinout, MIC5238-1.1YD5-TR application, or MIC5238-1.1YD5-TR equivalent, key selection criteria include ultra-low input voltage support (1.5V min), µCap stability with 2.2µF ceramic output capacitor, zero shutdown current, reverse leakage protection, and thermal/current limiting-critical for space-constrained, long-life portable power rails.
Technical Context
The MIC5238-1.1YD5-TR implements a dual-input architecture: main supply (IN) powers the pass element and output stage, while dedicated BIAS input supplies only the control circuitry at ultra-low current (23µA typ). This decoupling enables high efficiency when IN is near VOUT (e.g., 1.5V IN → 1.1V OUT) while BIAS runs from a higher rail (2.3–6V).
It operates as a fixed-output, CMOS-based LDO with active-high EN pin, internal current limit and thermal shutdown, and no-load regulation stability-enabling direct use in CMOS RAM keep-alive circuits without external load resistors. Its µCap design eliminates need for tantalum or electrolytic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.1V ±2.0% over –40°C to +125°C - ensures stable core voltage for low-voltage microcontrollers without external feedback. |
| Max Output Current | 150mA continuous - supports single-core embedded processors and peripheral I/O rails in handheld devices. |
| Dropout Voltage | 310mV at 150mA - allows operation from 1.41V input, enabling use with partially discharged Li-ion or dual-cell alkaline batteries. |
| Quiescent Current | 23µA on BIAS pin - minimizes standby power loss in always-on subsystems such as real-time clocks or sensor wake logic. |
| Input Voltage Range | IN: 1.5V to 6V; BIAS: 2.3V to 6V - permits flexible dual-rail sourcing (e.g., 1.5V battery + 3.3V system rail) for optimized efficiency. |
| Output Capacitor | Stable with ≥2.2µF ceramic (X7R/X5R), ESR ≤3Ω - enables compact, high-reliability filtering without bulk capacitance or ESR tuning. |
| Shutdown Current | ≤0.5µA at EN = 0V - achieves true zero-power disable state for firmware-controlled power gating. |
Pinout & Package
Package: TSOT-23-5 (Thin Small Outline Transistor, 5-pin), 1.6mm × 1.6mm × 0.55mm body, 0.95mm pitch - optimized for high-density portable PCB layouts with improved thermal performance vs. standard SOT-23-5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Main input supply connection | Carries full load current; must be bypassed locally to minimize noise and transient droop during load steps. |
| 2 (GND) | Analog/digital ground reference | Single ground pin shared by IN, BIAS, and OUT paths; requires low-impedance PCB return path to avoid regulation error. |
| 3 (EN) | Active-high enable control | Logic-level input (VIH ≥2.0V, VIL ≤0.2V); must not be left floating-tie to VBIAS or microcontroller GPIO for controlled startup/shutdown. |
| 4 (BIAS) | Dedicated bias supply input | Powers internal reference and control circuitry only; draws 23µA typical-enables efficiency gains when sourced from higher-voltage rail. |
| 5 (OUT) | Regulated output terminal | Delivers 1.1V ±2% to load; requires ≥2.2µF ceramic capacitor with ESR ≤3Ω for guaranteed stability across temperature and load. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply architecture (IN + BIAS) | Enables >66% conversion efficiency at 150mA by isolating high-current and low-current paths-reducing heat and extending battery life in portable systems. |
| µCap stability | Guaranteed stable with 2.2µF X7R ceramic output capacitor-eliminates need for larger, less reliable tantalum or aluminum electrolytic caps. |
| No-load regulation | Maintains 1.1V output with zero load current-supports CMOS RAM backup, RTC, and other always-on functions without minimum load resistor. |
| Reverse leakage protection | Limits reverse current to ≤5µA when VIN = 0V and VOUT = 1.1V-prevents battery drain through regulator during system sleep or power-off states. |
| Thermal & current protection | Auto-shutdown at junction temperature >125°C and current limit ~500mA-ensures robustness under overload or poor PCB thermal design. |
Applications
| Smartphone Baseband Power | Wearable Sensor Node Core Supply |
|---|---|
Use Scenario: Powering ARM Cortex-M0+ baseband processor core in LTE/5G smartphones operating from single-cell Li-ion (3.0–4.2V) with tight thermal constraints. IC Role / Device Role / Timing Role: Primary 1.1V core LDO delivering regulated voltage to CPU core with fast transient response and minimal quiescent draw during deep-sleep modes. Use Value: Dual-supply mode allows BIAS from 3.3V system rail while IN sourced from buck converter output near 1.4V-cutting total power dissipation by 40% vs. single-rail LDO. |
Use Scenario: Providing stable 1.1V supply to ultra-low-power environmental sensor hub (e.g., Bosch BME680) in Bluetooth LE wristband with coin-cell battery. IC Role / Device Role / Timing Role: Always-on LDO maintaining regulation during 10µA sensor idle state and scaling to 150mA peak during ADC sampling bursts. Use Value: 23µA BIAS current and zero shutdown current extend coin-cell lifetime beyond 12 months; no-load stability avoids need for pull-down resistors. |
| Industrial Handheld Terminal MCU Rail | Medical Glucose Meter ASIC Supply |
Use Scenario: Delivering 1.1V to RISC-V MCU in ruggedized warehouse scanner powered by rechargeable NiMH pack (1.2–1.5V/cell). IC Role / Device Role / Timing Role: Input-tracking LDO supporting operation down to 1.5V IN-enabling full functionality even at end-of-discharge voltage. Use Value: 310mV dropout ensures usable 1.1V output until cell voltage drops below 1.41V, maximizing runtime per charge cycle. |
Use Scenario: Regulating precision analog front-end and low-power display driver in FDA-cleared glucose meter using AAA alkaline batteries. IC Role / Device Role / Timing Role: Primary 1.1V supply with ±2.0% accuracy and <1mV load regulation-ensuring consistent ADC reference and display contrast across battery life. Use Value: Reverse leakage protection prevents battery self-discharge when device is stored with batteries installed; thermal shutdown guards against misuse-induced overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-1102E/MB | Single-supply only (no BIAS pin); 2.0µA quiescent current; 600mV dropout at 250mA; SOT-23-3 package. | Lacks dual-supply efficiency benefit; requires higher minimum input (2.0V); no enable pin-always-on operation. | Select when board space is critical and dual-rail sourcing is unavailable; verify dropout margin at lowest battery voltage. |
| Torex XC6219B112MR-G | Single-supply LDO; 1µA quiescent current; 160mV dropout at 100mA; SOT-25 package; no reverse leakage protection. | Lower IQ but no BIAS efficiency boost; no integrated shutdown; limited thermal protection scope. | Prefer for ultra-low-IQ standby-only rails where dual-rail layout is impractical; add external reverse-blocking diode if needed. |
Compared with MCP1703T-1102E/MB and XC6219B112MR-G, the MIC5238-1.1YD5-TR uniquely delivers dual-supply efficiency, zero shutdown current, and reverse leakage protection in a 5-pin TSOT-making it optimal for battery-powered systems requiring both ultra-low standby power and high active-load efficiency.
Availability
MIC5238-1.1YD5-TR is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor node core supply, and industrial handheld terminal MCU rails requiring stable component supply, long-lifecycle availability, and Pb-free compliance.
Supply support for MIC5238-1.1YD5-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, specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.
The MIC5238-1.1YD5-TR belongs to Micrel's IttyBitty® ultra-low-IQ LDO family, engineered specifically for battery-operated portable electronics where extended runtime, small footprint, and dual-rail efficiency are mandatory design requirements.
FAQ
What is the minimum input voltage required for MIC5238-1.1YD5-TR to regulate at 1.1V?
The MIC5238-1.1YD5-TR requires a minimum IN voltage of 1.5V to maintain regulation. With a 310mV dropout at 150mA, it can sustain 1.1V output down to 1.41V input under full load-but the absolute minimum specified IN is 1.5V to guarantee performance across temperature and process variation. Below 1.5V, regulation is not assured.
Does MIC5238-1.1YD5-TR require an external capacitor on the BIAS pin?
No, the MIC5238-1.1YD5-TR does not require an external capacitor on the BIAS pin. The BIAS supply powers only the internal reference and control circuitry, drawing just 23µA typical. A local 0.1µF ceramic bypass capacitor is recommended if the BIAS source has high impedance or noise, but it is not mandatory for stability.
Can MIC5238-1.1YD5-TR operate with only the IN pin powered and BIAS left unconnected?
No. The MIC5238-1.1YD5-TR requires both IN and BIAS pins to be powered within their respective operating ranges (IN: 1.5–6V; BIAS: 2.3–6V) for normal regulation. Leaving BIAS unconnected or below 2.3V will prevent proper operation-the device may not start up or may exhibit erratic behavior due to insufficient bias for internal circuitry.
What is the maximum allowable output capacitor value for MIC5238-1.1YD5-TR?
There is no maximum limit on the output capacitor value for the MIC5238-1.1YD5-TR. The regulator is stable with ≥2.2µF ceramic capacitors and remains stable with larger values-including 10µF, 22µF, or higher-provided ESR stays ≤3Ω. Larger capacitors improve transient response and reduce output ripple, especially under dynamic load conditions.
Is MIC5238-1.1YD5-TR compatible with Y5V ceramic capacitors on the output?
Y5V dielectric capacitors are not recommended for MIC5238-1.1YD5-TR. Their capacitance can drop by up to 60% over temperature, risking violation of the 2.2µF minimum requirement. X7R or X5R ceramics are specified-guaranteeing ≥85% of nominal capacitance across –40°C to +85°C-ensuring stable regulation under all operating conditions.
MIC5238-1.1YD5-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:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 20 µA
- Current - Supply (Max):
- 2.5 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MIC5238-1.1YD5-TR FAQ
1.How can I place an order for MIC5238-1.1YD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5238-1.1YD5-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 MIC5238-1.1YD5-TR reliable?
The price and inventory of MIC5238-1.1YD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5238-1.1YD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5238-1.1YD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5238-1.1YD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5238-1.1YD5-TR?
MIC5238-1.1YD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5238-1.1YD5-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 MIC5238-1.1YD5-TR?
For technical support, including MIC5238-1.1YD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5238-1.1YD5-TR requirements.
6.How does Aetrix verify that MIC5238-1.1YD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5238-1.1YD5-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 MIC5238-1.1YD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5238-1.1YD5-TR?
All MIC5238-1.1YD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5238-1.1YD5-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 MIC5238-1.1YD5-TR part is unused and in its original packaging.
Return procedure for MIC5238-1.1YD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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