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Microchip Technology MIC5268-1.2YM5-TR
- Part No.:
- MIC5268-1.2YM5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MIC5268-1.2YM5-TR.pdf
- Description:
- IC REG LINEAR 1.2V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,362
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Product details
Overview
MIC5268-1.2YM5-TR from Micrel is a fixed-output 1.2V, 150mA CMOS low-dropout (LDO) voltage regulator in SOT-23-5 package with integrated Power Good (PG) open-drain output, ±3% output voltage accuracy, and ultra-low 100µA load-independent ground current-designed for power sequencing in portable computing and PCMCIA applications.
For engineers reviewing the MIC5268-1.2YM5-TR datasheet, MIC5268-1.2YM5-TR pinout, MIC5268-1.2YM5-TR application, or MIC5268-1.2YM5-TR equivalent, key selection criteria include its active-high enable input, fast transient response via totem-pole output stage, thermal shutdown at 150°C, stability with 1µF ceramic capacitors, and PG delay of 1–5ms after regulation is achieved.
Technical Context
The MIC5268-1.2YM5-TR integrates a P-channel MOSFET pass device with an N-channel clamp for overshoot suppression during load transients, enabling recovery from 100mA to 100µA load steps without external compensation. Its internal reference and error amplifier deliver tight line regulation (±0.3%/V) and load regulation (±3%) over –40°C to +125°C.
Power Good logic monitors VOUT against 88% (PG OFF) and 97% (PG ON) thresholds while OR-ing fault signals from overcurrent, overtemperature, and dropout detection. The enable input is CMOS-compatible (VIH ≥ 1.6V, VIL ≤ 0.4V), requiring termination-floating EN is prohibited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±3% initial accuracy ensures stable core supply for low-voltage processors and memory interfaces. |
| Max Output Current | 150mA continuous output supports single-rail power domains in palmtop and notebook subsystems. |
| Ground Current | 100µA typical, load-independent quiescent current enables battery-sensitive designs with predictable standby drain. |
| Power Good Threshold | PG asserts high when VOUT reaches ≥97% of 1.2V and de-asserts below 88%, providing reliable power-on reset timing. |
| Enable Logic | Active-high CMOS input (VIH ≥ 1.6V) with <0.01µA leakage enables clean system-level power control without pull-up overhead. |
| Thermal Shutdown | Triggers at 150°C with 10°C hysteresis, protecting against sustained overload or poor PCB thermal layout. |
| Stability Capacitor | Stable with ≥1µF X7R ceramic output capacitor-no ESR requirements reduce BOM count and board area. |
Pinout & Package
Package: SOT-23-5 (M5), surface-mount, 5-pin plastic package with exposed pad not present; footprint compatible with JEDEC MO-178AA standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Supply Input | Input voltage range +2.7V to +6V; connects to upstream DC source or battery rail. |
| 2 - GND | Ground Reference | Common return path for regulator, enable, and PG circuits; must be low-impedance connection. |
| 3 - EN | Enable/Shutdown Input | CMOS-compatible active-high control; logic low forces "zero" off-mode current (<1µA). |
| 4 - PG | Power Good Open-Drain Output | Drives low on fault or undervoltage; requires external pull-up for system reset generation. |
| 5 - OUT | Regulated Output | Delivers 1.2V ±3% to load; bypassed with ≥1µF ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Power Good Indicator | Open-drain PG output with programmable delay (1–5ms) enables precise power-on reset sequencing in multi-rail systems. |
| Totem-Pole Output Stage | P-ch pass FET + N-ch clamp reduces output overshoot and cuts transient recovery time from heavy-to-light load transitions. |
| Active Shutdown Clamp | N-channel discharge transistor rapidly de-energizes load and output capacitor when EN = low, preventing backfeed or latch-up. |
| Ultra-Low Ground Current | 100µA typical, constant across 0–150mA load range-critical for battery runtime estimation and low-power sleep modes. |
| Low-ESR Ceramic Stability | Guaranteed stable with 1µF X7R ceramic (not tantalum-dependent), reducing cost, size, and temperature drift vs. electrolytic solutions. |
Applications
| Processor Power-Up Sequencing | Laptop/Notebook Core Rail |
|---|---|
Use Scenario: Coordinating startup order between CPU, memory, and I/O rails in embedded x86 or ARM-based platforms. IC Role / Device Role / Timing Role: Primary 1.2V LDO supplying processor core voltage with synchronized PG signal to release reset. Use Value: Ensures deterministic boot by holding downstream logic in reset until regulated 1.2V is within ±3% and stable for ≥1ms. | Use Scenario: Delivering clean, low-noise 1.2V to CPU voltage domains in space-constrained notebooks. IC Role / Device Role / Timing Role: Fixed-output LDO with fast transient response mitigates voltage droop during burst-mode CPU activity. Use Value: Maintains regulation under 100mA→100µA load steps without external compensation or large bulk caps. |
| PCMCIA VCC Regulation | Palmtop System Power Management |
Use Scenario: Providing compliant +3.3V or +5V auxiliary power (via external resistor divider feedback) to PCMCIA card slots. IC Role / Device Role / Timing Role: Configurable LDO variant used as VCC regulator with PG monitoring for hot-plug detection. Use Value: PG output signals card insertion readiness; enable input allows host-controlled slot power gating. | Use Scenario: Managing battery-powered subsystems in handheld PDAs with aggressive sleep/wake cycles. IC Role / Device Role / Timing Role: Low-quiescent LDO enabling <1µA off-state current and rapid wake-up via EN pin. Use Value: Extends battery life by eliminating leakage paths and supporting sub-100µs turn-on latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-1202E/TO | 150mA, 1.2V fixed, 2µA quiescent current; no Power Good output; TO-92 package. | Lacks PG signaling and SOT-23-5 footprint-requires PCB redesign and external reset IC for sequencing. | Select when ultra-low IQ dominates over sequencing capability and through-hole assembly is acceptable. |
| TPS7A0512PDBVR | 200mA, 1.2V fixed, 25µA IQ, integrated PG, SOT-23-5-but requires minimum 2.2µF output capacitance. | Higher output cap requirement increases board area and cost; tighter thermal spec (θJA = 220°C/W) demands better layout. | Prefer when higher current headroom and modern TI support ecosystem outweigh ceramic cap flexibility. |
Compared with MCP1700-1202E/TO and TPS7A0512PDBVR, the MIC5268-1.2YM5-TR uniquely balances 100µA ground current, PG functionality, and 1µF ceramic stability in SOT-23-5-making it optimal for legacy-compliant, space-constrained portable designs where minimal BOM and proven reliability are critical.
Availability
MIC5268-1.2YM5-TR is available at Aetrix Electronics and suitable for laptop power sequencing, PCMCIA regulation, and palmtop system management requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for MIC5268-1.2YM5-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 precision power management and timing solutions.
The MIC5268 family was designed specifically for portable computing and peripheral interface power domains-emphasizing small footprint, low IQ, and integrated sequencing features like Power Good and active shutdown.
FAQ
What is the maximum input voltage rating for MIC5268-1.2YM5-TR?
The absolute maximum input voltage for MIC5268-1.2YM5-TR is +7V, but the recommended operating range is +2.7V to +6V. Exceeding +6V risks violating thermal limits-e.g., at 150mA output and 3.4V input in minimum-footprint SOT-23-5 layout, power dissipation remains within the 315mW limit derived from θJA = 235°C/W and TJ(max) = 125°C.
Does MIC5268-1.2YM5-TR require an input capacitor?
No, MIC5268-1.2YM5-TR does not require an input capacitor for stability. A 1µF ceramic input capacitor is only recommended if the bulk supply is >10 inches away or sourced from a battery with high impedance. The regulator's internal design eliminates input cap dependency, simplifying layout and reducing component count.
How does the Power Good output of MIC5268-1.2YM5-TR behave during startup and fault conditions?
The MIC5268-1.2YM5-TR PG output is open-drain and pulls low during undervoltage (VOUT < 88% of 1.2V), overcurrent, overtemperature, or dropout. It releases high only after VOUT exceeds 97% of nominal and a 1–5ms internal delay elapses. This behavior makes MIC5268-1.2YM5-TR suitable for generating clean, debounced power-on reset signals without external timers.
Can MIC5268-1.2YM5-TR operate with Y5V ceramic capacitors on the output?
Y5V dielectric capacitors are not recommended for MIC5268-1.2YM5-TR due to up to 60% capacitance loss over temperature. The datasheet specifies ≥1µF minimum output capacitance at worst-case conditions-X7R ceramics (±15% variation) or tantalum (±10%) meet this reliably. Using Y5V would require oversized values to guarantee minimum C at extremes, increasing cost and board area unnecessarily.
What is the shutdown current of MIC5268-1.2YM5-TR when EN is low?
When EN is driven low, MIC5268-1.2YM5-TR enters "zero" off-mode current state with total supply current ≤0.45µA (typical) and ≤1µA (max) at TA = 25°C. This ultra-low shutdown current prevents battery drain in always-on portable systems and enables rapid wake-up without capacitor recharge delays.
MIC5268-1.2YM5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Power Good
- 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:
- SOT-23-5
MIC5268-1.2YM5-TR FAQ
1.How can I place an order for MIC5268-1.2YM5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5268-1.2YM5-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 MIC5268-1.2YM5-TR reliable?
The price and inventory of MIC5268-1.2YM5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5268-1.2YM5-TR is usually 5 days.
3.What payment methods are accepted for MIC5268-1.2YM5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5268-1.2YM5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5268-1.2YM5-TR?
MIC5268-1.2YM5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5268-1.2YM5-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 MIC5268-1.2YM5-TR?
For technical support, including MIC5268-1.2YM5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5268-1.2YM5-TR requirements.
6.How does Aetrix verify that MIC5268-1.2YM5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5268-1.2YM5-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 MIC5268-1.2YM5-TR meets industry standards.
7.What is the process for return or replacement of MIC5268-1.2YM5-TR?
All MIC5268-1.2YM5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5268-1.2YM5-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 MIC5268-1.2YM5-TR part is unused and in its original packaging.
Return procedure for MIC5268-1.2YM5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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