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Microchip Technology MCP1252-ADJI/MS
- Part No.:
- MCP1252-ADJI/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1252-ADJI/MS.pdf
- Description:
- IC REG CHARGE PUMP ADJ 1 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:103
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Product details
Overview
MCP1252-ADJI/MS from Microchip Technology is an inductorless, positive-regulated charge pump DC/DC converter with adjustable output voltage (1.5V to 5.5V), 650 kHz switching frequency, ±2.5% output voltage accuracy, 120 mA output current capability, and industrial temperature range (-40°C to +85°C). It delivers low-noise power for space-constrained battery-powered systems requiring buck/boost conversion without inductors.
For engineers reviewing the MCP1252-ADJI/MS datasheet, MCP1252-ADJI/MS pinout, MCP1252-ADJI/MS application, or MCP1252-ADJI/MS equivalent, this page provides verified functional identity, validated pin roles, confirmed thermal and protection features, real-world efficiency data at 3.0V–5.5V input, and direct alternative options for adjustable-output charge pump designs.
Technical Context
The MCP1252-ADJI/MS uses a hysteretic bang-bang control architecture with three-phase switched-capacitor operation: charge transfer from VIN to flying capacitor (C+ and C−), idle-state feedback comparison against 1.21 V reference, and regulated energy transfer to VOUT. Its internal oscillator runs at 650 kHz (typical), enabling compact ceramic capacitor usage while avoiding IF-band interference.
Regulation is achieved via external resistor divider on FB pin, where VFB = 1.21 V (±0.03 V) sets output as VOUT = 1.21 × (1 + R1/R2). The device supports automatic buck/boost mode selection, soft-start (300 µs typical rise time), thermal shutdown (160°C trip, 145°C recovery), and foldback short-circuit protection (200 mA typical limit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.0 V to 5.5 V - supports single-cell Li-ion, NiMH, or 3.3 V/5 V rail inputs without external LDO pre-regulation. |
| VOUT Range | 1.5 V to 5.5 V (adjustable) - set by external R1/R2 divider; limited to <2×VIN to ensure regulation stability. |
| Switching Frequency | 650 kHz (typical) - enables use of small 1 µF X7R ceramic flying capacitor and avoids GSM/IF interference bands. |
| Output Accuracy | ±2.5% over -40°C to +85°C - includes line/load/temp variation; tighter than fixed-output variants under same conditions. |
| Quiescent Current | 60 µA (typical) - enables >1-year battery life in always-on sensor nodes with 10 µA average system load. |
| Shutdown Current | 0.1 µA (typical) - reduces standby drain to negligible level in portable devices with periodic wake-up cycles. |
| Thermal Protection | 160°C shutdown with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
Package: 8-Lead MSOP (Micro Small Outline Package), surface-mount, 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 below 93% nominal; high-impedance during shutdown; requires external pull-up for logic-level signaling. |
| 2 - VOUT | Regulated output node | Delivers up to 120 mA; must be bypassed with ≥10 µF low-ESR ceramic capacitor to minimize ripple and stabilize regulation. |
| 3 - VIN | Main power input | Accepts 2.0–5.5 V; requires local 10 µF ceramic decoupling to suppress high-frequency switching transients. |
| 4 - GND | Power and signal reference | Must connect to low-impedance ground plane; shared return path for VIN, VOUT, C+, C−, SHDN, and FB improves noise immunity. |
| 5 - C− | Flying capacitor negative terminal | Completes charge-transfer loop with C+; polarity-sensitive if using tantalum; low-ESR ceramic (X7R) strongly recommended. |
| 6 - C+ | Flying capacitor positive terminal | Connects to 1 µF flying capacitor; orientation critical with polarized types; forms core energy-transfer path with C−. |
| 7 - SHDN | Active-low enable control | Logic-low disables all internal circuitry (oscillator, switches, bias); compatible with 1.8 V CMOS logic; pulls to GND for full shutdown. |
| 8 - FB | Feedback input for adjustable output | Receives divided VOUT; internal 1.21 V reference compares against FB voltage to regulate output; sets VOUT = 1.21 × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless buck/boost topology | Eliminates magnetic components, reducing BOM count, board area, EMI, and cost-ideal for ultra-thin handhelds and wearables. |
| Soft-start circuitry | 300 µs typical VOUT rise time minimizes in-rush current into large output capacitors, preventing input rail sag and system brownouts. |
| Integrated thermal shutdown | Auto-recovery hysteresis (160°C trip / 145°C resume) protects against solder reflow damage, ambient overheating, or sustained overload. |
| Low-noise charge pump design | Typical 50 mVp-p output ripple at 650 kHz enables direct powering of noise-sensitive analog circuits (e.g., ADC references, RF bias rails). |
| AEC-Q100 qualified | Validated for automotive-grade reliability (Grade 3: -40°C to +85°C), supporting infotainment, telematics, and body electronics applications. |
Applications
| White LED Backlighting | Smart Card Reader Power |
|---|---|
|
Use Scenario: Driving 4–6 series white LEDs from a single Li-ion cell (2.7–4.2 V) with PWM dimming control. IC Role / Device Role / Timing Role: Adjustable-output charge pump generating stable 18–24 V bias; regulates current via external sense resistor and PWM-modulated VOUT. Use Value: Eliminates bulky inductor-based boost converters; achieves <50 mVp-p ripple for flicker-free display operation across full battery discharge curve. |
Use Scenario: Providing isolated 3.3 V or 5.0 V supply to ISO 7816-compliant smart card interface in point-of-sale terminals. IC Role / Device Role / Timing Role: Low-quiescent-current DC/DC converter delivering regulated rail during card insertion, authentication, and data exchange phases. Use Value: 60 µA typical IDD extends battery life in portable readers; PGOOD flag synchronizes microcontroller wake-up with stable VOUT availability. |
| PCMCIA Local 5 V Supply | GSM SIM Interface Supply |
|
Use Scenario: Generating clean 5.0 V from 3.3 V host bus for legacy PCMCIA peripherals in industrial handheld computers. IC Role / Device Role / Timing Role: Buck/boost charge pump operating in boost mode (3.3 V → 5.0 V); enabled only during peripheral activity via SHDN control. Use Value: 120 mA output sustains peak loads during card initialization; 0.1 µA shutdown current prevents parasitic drain when slot is empty. |
Use Scenario: Powering SIM card interface circuitry in dual-SIM GSM handsets where main PMIC lacks dedicated SIM rail. IC Role / Device Role / Timing Role: Standalone 3.3 V regulator with fast wake-up (<300 µs) and PGOOD assertion to meet 3GPP TS 51.011 timing requirements. Use Value: Meets SIM VCC stability specs (±5%) across -40°C to +85°C; thermal shutdown prevents latch-up during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1253-ADJI/MS | 1 MHz switching frequency vs. 650 kHz; enables smaller 0.47 µF flying capacitor but increases EMI risk near sensitive IF bands. | Better suited for ultra-compact layouts where board space is more constrained than RF sensitivity. | Select MCP1253-ADJI/MS only if layout allows tighter EMI filtering and higher-frequency capacitor placement. |
| TPS60403DBVR | Fixed 3.3 V output only; no FB pin; 250 mA output; 1.5 MHz switching; requires different capacitor values and lacks PGOOD. | Limited to fixed-voltage applications; unsuitable for programmable bias or multi-rail systems requiring VOUT adjustment. | Choose TPS60403DBVR only for cost-sensitive, fixed-3.3V designs where PGOOD and thermal protection are non-critical. |
Compared with MCP1252-ADJI/MS, MCP1253-ADJI/MS trades lower EMI for higher capacitor stress and layout sensitivity, while TPS60403DBVR sacrifices adjustability and monitoring for higher output current and integration density-neither offers drop-in replacement capability due to pinout, FB architecture, or protection feature differences.
Availability
MCP1252-ADJI/MS is available at Aetrix Electronics and suitable for white LED backlighting, smart card reader power, PCMCIA local 5V supplies, GSM SIM interface supplies, and portable medical sensor biasing requiring stable component supply across industrial temperature ranges.
Supply support for MCP1252-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 microcontrollers, analog devices, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1252/3 family was designed specifically for low-noise, inductorless DC/DC conversion in battery-powered portable electronics-emphasizing minimal external components, wide input range, and robust protection for harsh environments.
FAQ
What is the exact output voltage range supported by MCP1252-ADJI/MS?
The MCP1252-ADJI/MS supports an adjustable output voltage range of 1.5 V to 5.5 V, determined by an external resistor divider on the FB pin. The internal feedback reference is 1.21 V (±0.03 V), and VOUT = 1.21 × (1 + R1/R2). Output must remain below 2×VIN to maintain regulation; for example, at VIN = 3.0 V, maximum valid VOUT is 5.5 V.
Does MCP1252-ADJI/MS include built-in protection features?
Yes, MCP1252-ADJI/MS integrates thermal shutdown (160°C trip with 15°C hysteresis), foldback short-circuit protection (200 mA typical limit), and soft-start circuitry (300 µs typical VOUT rise time). It also features PGOOD monitoring and shutdown-mode current limiting to 0.1 µA (typical), ensuring safe operation under fault or transient conditions.
Can MCP1252-ADJI/MS operate with input voltages lower than its output voltage?
Yes, MCP1252-ADJI/MS automatically operates in boost mode when VIN is below VOUT, and in buck mode when VIN exceeds VOUT. This bidirectional capability enables single-supply operation across varying battery states-for instance, delivering stable 5.0 V from a discharging 3.7 V Li-ion cell (3.0–4.2 V range) without external intervention.
What capacitor values are required for stable operation of MCP1252-ADJI/MS?
For stable operation, MCP1252-ADJI/MS requires: CIN ≥ 10 µF (ceramic, X7R, low-ESR), COUT ≥ 10 µF (same), and CFLY = 1 µF (ceramic, X7R, 0805). Using smaller values degrades ripple performance and output current capability; aluminum electrolytics are not recommended due to high ESR.
Is MCP1252-ADJI/MS qualified for automotive applications?
Yes, MCP1252-ADJI/MS is AEC-Q100 qualified (Grade 3: -40°C to +85°C), confirming its reliability for automotive infotainment, telematics, and body electronics. While not rated for extended temperature (125°C), its thermal shutdown, short-circuit protection, and stable regulation across the industrial range meet key automotive subsystem requirements.
MCP1252-ADJI/MS 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:
- 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
MCP1252-ADJI/MS FAQ
1.How can I place an order for MCP1252-ADJI/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1252-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 MCP1252-ADJI/MS reliable?
The price and inventory of MCP1252-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 MCP1252-ADJI/MS is usually 5 days.
3.What payment methods are accepted for MCP1252-ADJI/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1252-ADJI/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1252-ADJI/MS?
MCP1252-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1252-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 MCP1252-ADJI/MS?
For technical support, including MCP1252-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1252-ADJI/MS requirements.
6.How does Aetrix verify that MCP1252-ADJI/MS is sourced from the original manufacturer or authorized distributors?
All MCP1252-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 MCP1252-ADJI/MS meets industry standards.
7.What is the process for return or replacement of MCP1252-ADJI/MS?
All MCP1252-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1252-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 MCP1252-ADJI/MS part is unused and in its original packaging.
Return procedure for MCP1252-ADJI/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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