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Microchip Technology MCP1253-ADJI/MSVAO
- Part No.:
- MCP1253-ADJI/MSVAO
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1253-ADJI/MSVAO.pdf
- Description:
- IC REG BUCK BST ADJ 120MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,988
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Product details
Overview
MCP1253-ADJI/MSVAO from Microchip Technology is an inductorless, positive-regulated charge pump DC/DC converter with adjustable output voltage (1.5V to 5.5V), 1 MHz switching frequency, ±2.5% output accuracy, 120 mA output current, and industrial temperature range (-40°C to +85°C). It operates across 2.0V–5.5V input and integrates thermal shutdown, short-circuit protection, and soft-start for battery-powered white LED biasing and SIM interface supply.
For engineers reviewing the MCP1253-ADJI/MSVAO datasheet, MCP1253-ADJI/MSVAO pinout, MCP1253-ADJI/MSVAO application, or MCP1253-ADJI/MSVAO equivalent, this page delivers verified electrical specs, validated MSOP-8 pin functions, confirmed buck/boost operation mode, PGOOD logic behavior, and real-world design implications for low-noise, space-constrained power conversion.
Technical Context
The MCP1253-ADJI/MSVAO uses a hysteretic bang-bang control architecture with three-phase switched-capacitor operation (charge transfer from VIN→CFLY, idle comparison, then CFLY→VOUT energy delivery). Regulation relies on internal 1.21 V reference and external FB divider, enabling precise output setting between 1.5 V and 5.5 V while maintaining ≤50 mVP-P ripple.
It automatically transitions between buck and boost modes depending on VIN/VOUT relationship, supports 0.1 µA shutdown current, and features open-drain PGOOD with 7% undervoltage detection hysteresis (0.93×VOUT threshold, 4% hysteresis). The 1 MHz oscillator enables smaller external capacitors versus 650 kHz MCP1252 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.0 V to 5.5 V - supports single-cell Li-ion, NiMH, or dual-AA inputs without external LDO pre-regulation. |
| Output Voltage Range | 1.5 V to 5.5 V - set via external resistor divider on FB pin; VOUT must remain below 2×VIN for stable regulation. |
| FB Reference Voltage | 1.21 V (1.18–1.24 V) - defines regulation point; output accuracy depends on resistor tolerance and layout parasitics. |
| Switching Frequency | 1 MHz - enables use of smaller 1 µF flying capacitor and reduces board area vs. 650 kHz MCP1252. |
| Output Current | 120 mA max at VIN ≥ 3.0 V - sufficient for driving 6-white-LED strings or powering GSM SIM interfaces. |
| Quiescent Current | 60 µA typical - ensures >1-year battery life in always-on sensor nodes with 200 mAh coin cell. |
| Shutdown Current | 0.1 µA typical - allows deep-sleep states in portable medical or IoT edge devices. |
Pinout & Package
Package: 8-Lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional per Microchip drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGOOD | Open-drain power-good flag | Asserts low when VOUT falls <7% below nominal; requires external pull-up to VOUT or system rail for logic-level signaling. |
| 2 - VOUT | Regulated output node | Must be bypassed with ≥10 µF ceramic capacitor (X7R, low ESR); output impedance rises under heavy transient load. |
| 3 - VIN | Main power input | Accepts 2.0–5.5 V; recommended 10 µF ceramic bypass to GND near pin to suppress high-frequency noise injection. |
| 4 - GND | Power and signal reference | Must connect to solid ground plane; shared return path for C-, C+, and load affects ripple and stability. |
| 5 - C- | Flying capacitor negative terminal | Connects to negative side of 1 µF ceramic flying capacitor; polarity critical if using tantalum or electrolytic types. |
| 6 - C+ | Flying capacitor positive terminal | Connects to positive side of 1 µF ceramic flying capacitor; mismatched C+/C- capacitance degrades efficiency and output current capability. |
| 7 - SHDN | Active-low enable control | Logic-low disables all internal circuitry; 0.4 V max VIL ensures compatibility with 1.8 V microcontrollers. |
| 8 - FB | Feedback input for adjustable output | Replaces SELECT pin function in ADJ variants; connects to resistor divider (R1/R2) to set VOUT = 1.21 V × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless charge pump topology | Eliminates magnetic components, reducing EMI, PCB area, and BOM cost-ideal for ultra-thin handhelds and wearables. |
| 1 MHz fixed-frequency operation | Enables use of compact 0805-size 1 µF flying capacitor and improves transient response over lower-frequency alternatives. |
| Hysteretic (bang-bang) regulation | Delivers consistent ~50 mVP-P output ripple independent of load, simplifying noise-sensitive analog circuit design. |
| Integrated soft-start and foldback protection | Limits in-rush current during startup (~300 µs to regulation) and caps short-circuit current at 200 mA typical, preventing thermal runaway. |
| AEC-Q100 qualified | Validated for automotive-grade reliability (Grade 3: -40°C to +85°C), supporting infotainment and body electronics applications. |
Applications
| White LED Backlighting | Smart Card Readers |
|---|---|
Use Scenario: Driving 4–6-series white LEDs from single-cell lithium battery (2.7–4.2 V). IC Role / Device Role / Timing Role: Adjustable-output charge pump providing constant-current bias via external PWM-controlled current-limit resistors. Use Value: Eliminates inductor, reduces solution size by >40%, and maintains >81% efficiency across battery discharge curve. | Use Scenario: Supplying 3.3 V or 5.0 V to ISO 7816-compliant smart card interface in POS terminals or access control units. IC Role / Device Role / Timing Role: Local voltage translator generating stable card supply from main 3.3 V system rail, with PGOOD monitoring for fault-safe insertion detection. Use Value: Meets strict 50 mVP-P ripple requirement for card communication integrity and supports hot-plug detection via PGOOD assertion timing. |
| GSM SIM Interface Supply | PCMCIA Local 5 V Supplies |
Use Scenario: Powering 1.8 V/3.0 V SIM cards in dual-mode GSM/GPRS handsets with dynamic voltage selection. IC Role / Device Role / Timing Role: Adjustable regulator delivering precise 1.8 V or 3.0 V from shared 3.3 V system bus, controlled via MCU GPIO. Use Value: Enables software-selectable SIM voltage without external LDOs, reducing component count and enabling fast voltage transitions (<200 µs wake-up). | Use Scenario: Generating local 5 V supply for PCMCIA/CardBus peripherals in embedded industrial computers. IC Role / Device Role / Timing Role: Buck/boost converter accepting variable 3.3 V or 5 V host rail and delivering regulated 5 V output with PGOOD handshake to controller. Use Value: Supports legacy 5 V peripherals from modern low-voltage platforms; PGOOD enables safe enumeration sequence before peripheral initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1253-33X50I/MS | Fixed 3.3 V/5.0 V output via SELECT pin; no FB network required; identical 1 MHz frequency and package. | Suitable only where output voltage is static; eliminates resistor divider but loses flexibility for multi-rail systems. | Choose when system requires only one of two factory-set outputs and board space is constrained. |
| TPS60403DBVR | 3.3 V fixed output, 600 kHz switching, 60 mA max IOUT, SOT-23-6 package; no PGOOD or thermal shutdown. | Limited to low-current, non-safety-critical applications; lacks fault reporting and robust protection features. | Select only for cost-sensitive, low-power consumer devices where 120 mA capability and AEC-Q100 compliance are unnecessary. |
Compared with MCP1253-33X50I/MS, MCP1253-ADJI/MSVAO trades pin simplicity for full output programmability; versus TPS60403DBVR, it delivers 2× output current, integrated fault signaling, and automotive qualification-making it suitable for higher-reliability, multi-voltage embedded designs.
Availability
MCP1253-ADJI/MSVAO is available at Aetrix Electronics and suitable for white LED backlighting, smart card readers, GSM SIM interface supply, and PCMCIA local 5 V supplies requiring stable component supply across industrial temperature ranges.
Supply support for MCP1253-ADJI/MSVAO 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
Microchip Technology Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1253 product line delivers low-noise, inductorless DC/DC conversion for space- and power-constrained portable electronics, emphasizing minimal external components, wide input range, and robust protection for battery-operated systems.
FAQ
What is the exact output voltage adjustment range supported by the MCP1253-ADJI/MSVAO?
The MCP1253-ADJI/MSVAO supports an output voltage range of 1.5 V to 5.5 V, set via an external resistor divider connected to the FB pin. The regulation point follows VOUT = 1.21 V × (1 + R1/R2), where R2 ≤ 30 kΩ and both resistors should be ≤1% tolerance for accuracy. Output must remain below 2×VIN to maintain regulation.
Does the MCP1253-ADJI/MSVAO require an external flying capacitor, and what value is specified?
Yes, the MCP1253-ADJI/MSVAO requires an external flying capacitor (CFLY) between pins C+ and C−. Microchip specifies a minimum value of 1 µF ceramic (X7R dielectric, 0805 package) to achieve full 120 mA output current. Using smaller values reduces available output current and increases ripple.
How does the PGOOD pin behave during startup and fault conditions for the MCP1253-ADJI/MSVAO?
The PGOOD pin on the MCP1253-ADJI/MSVAO is open-drain and remains high-impedance until VOUT reaches 90% of target. It asserts low if VOUT drops below 0.93×VOUT (typical) for >200 µs. During shutdown (SHDN = low), PGOOD is high-impedance. A 10 kΩ–1 MΩ pull-up to VOUT is required for logic-level output.
Can the MCP1253-ADJI/MSVAO operate with input voltages both above and below the desired output voltage?
Yes, the MCP1253-ADJI/MSVAO automatically switches between buck and boost modes depending on the VIN-to-VOUT relationship. When VIN < VOUT, it operates in boost mode; when VIN > VOUT, it operates in buck mode-enabling single-chip conversion across varying battery states without manual reconfiguration.
What thermal protection features are integrated into the MCP1253-ADJI/MSVAO?
The MCP1253-ADJI/MSVAO includes thermal shutdown with hysteresis: it disables operation when junction temperature exceeds ~160°C and auto-restarts once temperature falls by ~15°C. This protects against sustained overload or poor PCB thermal design, and is complemented by foldback short-circuit current limiting (200 mA typical).
MCP1253-ADJI/MSVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost, Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 120mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP1253-ADJI/MSVAO FAQ
1.How can I place an order for MCP1253-ADJI/MSVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1253-ADJI/MSVAO 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 MCP1253-ADJI/MSVAO reliable?
The price and inventory of MCP1253-ADJI/MSVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1253-ADJI/MSVAO is usually 5 days.
3.What payment methods are accepted for MCP1253-ADJI/MSVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1253-ADJI/MSVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1253-ADJI/MSVAO?
MCP1253-ADJI/MSVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1253-ADJI/MSVAO 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 MCP1253-ADJI/MSVAO?
For technical support, including MCP1253-ADJI/MSVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1253-ADJI/MSVAO requirements.
6.How does Aetrix verify that MCP1253-ADJI/MSVAO is sourced from the original manufacturer or authorized distributors?
All MCP1253-ADJI/MSVAO 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 MCP1253-ADJI/MSVAO meets industry standards.
7.What is the process for return or replacement of MCP1253-ADJI/MSVAO?
All MCP1253-ADJI/MSVAO units undergo pre-shipment inspection (PSI). If there is an issue with MCP1253-ADJI/MSVAO, 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 MCP1253-ADJI/MSVAO part is unused and in its original packaging.
Return procedure for MCP1253-ADJI/MSVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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