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Microchip Technology MCP1252T-ADJI/MS
- Part No.:
- MCP1252T-ADJI/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1252T-ADJI/MS.pdf
- Description:
- IC REG CHARGE PUMP ADJ 1 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1252T-ADJI/MS from Microchip Technology is an inductorless, positive-regulated charge pump DC/DC converter with adjustable output (1.5V–5.5V), 120 mA output current, ±2.5% output voltage accuracy, and 650 kHz switching frequency. It operates from 2.0V to 5.5V input and delivers low-noise power for space-constrained, battery-powered systems such as white LED backlighting and SIM interface supplies.
For engineers reviewing the MCP1252T-ADJI/MS datasheet, MCP1252T-ADJI/MS pinout, MCP1252T-ADJI/MS application, or MCP1252T-ADJI/MS equivalent, key selection criteria include its buck/boost capability without inductors, thermal/short-circuit protection, soft-start circuitry, MSOP-8 package compatibility, and AEC-Q100 qualification for extended-temperature industrial use.
Technical Context
The MCP1252T-ADJI/MS uses a hysteretic (bang-bang) switched-capacitor charge pump architecture that automatically transitions between buck and boost modes depending on VIN vs. VOUT relationship. Regulation is achieved via internal 1.21V reference and external resistor divider feedback (FB pin), enabling precise output setting across 1.5V–5.5V.
It features integrated soft-start (≈300 µs startup time), open-drain PGOOD with 7% undervoltage detection hysteresis, shutdown current of 0.1 µA (typ), and thermal shutdown at 160°C with 15°C hysteresis. The device requires only three external ceramic capacitors (CIN, COUT, CFLY) and supports 1.8V logic-compatible SHDN input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.0V to 5.5V - supports single-cell Li-ion, NiMH, or 3.3V/5V rail inputs without level shifting. |
| VOUT Range | 1.5V to 5.5V (adjustable) - set via external resistor divider on FB pin; VOUT must stay below 2×VIN. |
| Output Current | 120 mA (max) - sustained delivery at full regulation; foldback short-circuit protection limits to 200 mA (typ). |
| Switching Frequency | 650 kHz (typ) - avoids IF interference bands; enables compact 1 µF flying capacitor (CFLY). |
| Quiescent Current | 60 µA (typ) - enables long battery life in always-on sensor or communication modules. |
| Shutdown Current | 0.1 µA (typ) - ultra-low leakage during system sleep; compatible with 1.8V logic high on SHDN. |
| Output Accuracy | ±2.5% - guaranteed over -40°C to +85°C (I-temp), including line/load/temperature variation. |
Pinout & Package
Package: 8-Lead MSOP (Plastic Micro Small Outline Package), 3.0 mm × 3.0 mm × 1.0 mm body, 0.65 mm pitch, exposed pad optional. RoHS-compliant, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGOOD | Open-drain power-good flag | Asserts low when VOUT falls <7% below nominal; high-impedance otherwise; requires external pull-up for logic-level output. |
| 2 - VOUT | Regulated output voltage node | Delivers up to 120 mA; bypassed to GND with ≥10 µF ceramic capacitor to minimize ripple and stabilize regulation. |
| 3 - VIN | Main power supply input | Accepts 2.0V–5.5V; requires local 10 µF ceramic decoupling to suppress high-frequency switching noise. |
| 4 - GND | Ground reference terminal | Must connect to low-impedance ground plane; critical for EMI control and thermal performance in high-dV/dt operation. |
| 5 - C- | Flying capacitor negative terminal | Connects to negative side of 1 µF low-ESR ceramic flying capacitor; polarity-sensitive if using tantalum. |
| 6 - C+ | Flying capacitor positive terminal | Connects to positive side of 1 µF flying capacitor; forms charge-transfer path between VIN and VOUT. |
| 7 - SHDN | Active-low shutdown control | Logic-low disables all internal circuitry; draws only 0.1 µA; 1.4V VIH threshold ensures 1.8V logic compatibility. |
| 8 - FB | Feedback input for adjustable output | Connects to resistor divider (R1/R2); regulates VOUT = 1.21V × (1 + R1/R2); R2 ≤ 30 kΩ recommended for accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless buck/boost conversion | Eliminates magnetic components-reduces BOM cost, board area, and EMI risk in portable designs. |
| Adjustable output (1.5V–5.5V) | Enables single-part support for multiple rail requirements (e.g., 3.3V MCU core, 5V peripheral interface). |
| Integrated soft-start & protection | 300 µs typical startup with in-rush limiting; thermal shutdown (160°C) and foldback short-circuit protection ensure robustness. |
| Low-noise regulated output | Typical 50 mVp-p ripple independent of load; optimized for analog sensors, RF bias, and display drivers. |
| AEC-Q100 qualified | Validated for automotive-grade reliability (Grade 3: -40°C to +85°C), supporting infotainment and body electronics. |
Applications
| White LED Backlighting | Smart Card Reader Power |
|---|---|
|
Use Scenario: Driving 4–6 series white LEDs from a single Li-ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Adjustable-output charge pump providing stable 18–24V bias with PWM dimming control. Use Value: Eliminates inductor-based boost converters; achieves >81% efficiency at 120 mA while meeting IEC 62368-1 ripple limits. |
Use Scenario: Supplying 3.3V or 5.0V to ISO 7816-compliant smart card interfaces in point-of-sale terminals. IC Role / Device Role / Timing Role: Fixed/adjustable DC/DC converter delivering regulated power during card insertion and data exchange. Use Value: Meets SIM interface supply specs (ETSI EN 301 345) with <0.4V dropout and fast wake-up (<200 µs) from shutdown mode. |
| PCMCIA Local 5V Supply | GSM Phone SIM Interface |
|
Use Scenario: Generating isolated 5V rail for PCMCIA/CardBus peripherals in industrial handheld computers. IC Role / Device Role / Timing Role: Buck/boost charge pump converting 3.3V system rail to 5V output with PGOOD monitoring. Use Value: Supports hot-plug detection via PGOOD assertion; maintains regulation across wide input transients (2.0V–5.5V). |
Use Scenario: Providing programmable 3.3V/5.0V SIM voltage in dual-mode GSM handsets with dynamic voltage switching. IC Role / Device Role / Timing Role: Selectable-output converter toggling between voltages via SELECT pin driven by baseband processor. Use Value: Enables single-component support for both 3G (3.3V) and legacy 2G (5.0V) SIM cards without external logic or LDOs. |
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 |
|---|---|---|---|
| MCP1253T-ADJI/MS | 1 MHz switching frequency; enables smaller 1 µF CFLY and lower output ripple (45 mVp-p vs. 50 mVp-p). | Better suited for noise-sensitive RF sections; higher frequency may increase EMI filtering complexity. | Choose when board space is constrained and lower ripple outweighs potential EMI mitigation effort. |
| TPS60403DBVR | TI part with 2.5V–6V input, fixed 5V output, 60 mA max, no adjustable option, 1.2 MHz fSW. | Limited to fixed 5V; lacks PGOOD, thermal shutdown, and AEC-Q100 qualification. | Select only for cost-sensitive, non-automotive, low-current (≤60 mA) applications where adjustability and protection are not required. |
Compared with MCP1253T-ADJI/MS, the MCP1252T-ADJI/MS offers lower EMI risk due to 650 kHz operation but slightly higher ripple; versus TPS60403DBVR, it provides full design flexibility (adjustable VOUT, PGOOD, thermal protection) and automotive qualification at higher current capability.
Availability
MCP1252T-ADJI/MS is available at Aetrix Electronics and suitable for white LED backlighting, smart card readers, PCMCIA local 5V supplies, GSM SIM interfaces, and industrial handheld computing requiring stable component supply across extended temperature ranges.
Supply support for MCP1252T-ADJI/MS 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 MCP1252/3 product line was designed specifically for low-noise, inductorless DC/DC conversion in battery-powered portable electronics-emphasizing minimal external components, thermal robustness, and seamless integration into space- and power-constrained systems.
FAQ
What output voltage range does the MCP1252T-ADJI/MS support?
The MCP1252T-ADJI/MS supports an adjustable output voltage from 1.5V to 5.5V, set via an external resistor divider connected to the FB pin. The output must remain below twice the input voltage (VOUT < 2 × VIN) to maintain regulation. Its internal 1.21V reference ensures ±2.5% accuracy over -40°C to +85°C, making it suitable for precision biasing in analog and RF circuits.
How does the MCP1252T-ADJI/MS handle input voltage lower than the desired output?
The MCP1252T-ADJI/MS automatically operates in boost mode when VIN is below VOUT, using its switched-capacitor charge pump to step up voltage without inductors. When VIN exceeds VOUT, it switches to buck mode for higher efficiency. This seamless buck/boost transition enables single-cell Li-ion (2.7V–4.2V) to power 3.3V or 5V rails reliably-critical for portable medical and IoT devices.
What is the purpose of the PGOOD pin on the MCP1252T-ADJI/MS?
The PGOOD pin on the MCP1252T-ADJI/MS is an open-drain output that signals when VOUT is within regulation-asserting low if VOUT drops below 93% of nominal value. It remains high-impedance during shutdown and provides glitch immunity for transients under 200 µs. Used with a 10 kΩ–1 MΩ pull-up to VOUT, it enables system-level power sequencing and fault detection in microcontroller-based designs.
Can the MCP1252T-ADJI/MS be used in automotive applications?
Yes-the MCP1252T-ADJI/MS is AEC-Q100 qualified (Grade 3) and specified for operation from -40°C to +85°C, making it suitable for automotive infotainment displays, telematics modules, and body control units. Its thermal shutdown (160°C), short-circuit protection, and low EMI 650 kHz switching frequency meet stringent automotive reliability and EMC requirements without additional filtering components.
What external components are required for basic operation of the MCP1252T-ADJI/MS?
The MCP1252T-ADJI/MS requires only three external ceramic capacitors: a 10 µF input capacitor (CIN) between VIN and GND, a 10 µF output capacitor (COUT) between VOUT and GND, and a 1 µF flying capacitor (CFLY) between C+ and C-. For adjustable output, two resistors (R1, R2) form a divider from VOUT to FB to GND. No inductors, diodes, or compensation networks are needed-enabling ultra-compact, low-BOM designs.
MCP1252T-ADJI/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- 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:
- 650kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP1252T-ADJI/MS FAQ
1.How can I place an order for MCP1252T-ADJI/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1252T-ADJI/MS 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 MCP1252T-ADJI/MS reliable?
The price and inventory of MCP1252T-ADJI/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1252T-ADJI/MS is usually 5 days.
3.What payment methods are accepted for MCP1252T-ADJI/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1252T-ADJI/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1252T-ADJI/MS?
MCP1252T-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1252T-ADJI/MS 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 MCP1252T-ADJI/MS?
For technical support, including MCP1252T-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1252T-ADJI/MS requirements.
6.How does Aetrix verify that MCP1252T-ADJI/MS is sourced from the original manufacturer or authorized distributors?
All MCP1252T-ADJI/MS 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 MCP1252T-ADJI/MS meets industry standards.
7.What is the process for return or replacement of MCP1252T-ADJI/MS?
All MCP1252T-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1252T-ADJI/MS, 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 MCP1252T-ADJI/MS part is unused and in its original packaging.
Return procedure for MCP1252T-ADJI/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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