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Microchip Technology MCP1253T-ADJI/MS
- Part No.:
- MCP1253T-ADJI/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1253T-ADJI/MS.pdf
- Description:
- IC REG CHARGE PUMP ADJ 1 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1253T-ADJI/MS from Microchip Technology is an inductorless, positive-regulated charge pump DC/DC converter with adjustable output (1.5V–5.5V), 1 MHz switching frequency, ±2.5% output voltage accuracy, 120 mA output current capability, and industrial temperature range (–40°C to +85°C). It enables compact, low-noise local voltage conversion in space-constrained battery-powered systems such as SIM interface supplies and white LED biasing.
For engineers reviewing the MCP1253T-ADJI/MS datasheet, MCP1253T-ADJI/MS pinout, MCP1253T-ADJI/MS application, or MCP1253T-ADJI/MS equivalent, key selection criteria include its buck/boost auto-switching architecture, FB-based output adjustability, PGOOD monitoring, thermal/short-circuit protection, and MSOP-8 package compatibility with ceramic capacitor-only design.
Technical Context
The MCP1253T-ADJI/MS uses a hysteretic bang-bang switched-capacitor charge pump topology that automatically transitions between buck and boost modes depending on VIN relative to VOUT. Its internal 1 MHz oscillator enables smaller external flying capacitors (≥1 µF) versus lower-frequency alternatives, reducing board area and cost.
Regulation is achieved via feedback (FB) pin sensing of a resistor divider referenced to a precise 1.21 V internal bandgap (±0.03 V typical). The open-drain PGOOD output asserts low when VOUT falls below 0.93×VOUT (typical), with 4% hysteresis, enabling reliable power sequencing in embedded systems.
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. |
| Output Voltage | Adjustable 1.5 V to 5.5 V - set by external R1/R2 divider; VOUT = 1.21 V × (1 + R1/R2); max output limited to <2×VIN. |
| Switching Frequency | 1 MHz - enables use of smaller 1 µF ceramic flying capacitor (CFLY), reducing footprint vs. 650 kHz MCP1252 variants. |
| Output Accuracy | ±2.5% - guaranteed over full industrial temperature range and load (≤120 mA), critical for stable analog/RF supply rails. |
| Quiescent Current | 60 µA typical - ensures minimal battery drain in always-on or low-duty-cycle portable applications. |
| Shutdown Current | 0.1 µA typical - allows deep-sleep mode in host MCU systems without compromising wake-up latency. |
| Thermal Protection | 160°C trip with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 8-Lead Plastic Micro Small Outline Package (MSOP), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional. RoHS-compliant, Pb-free matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGOOD | Open-drain power-good flag | Asserts low when VOUT drops below 0.93×VOUT; requires external pull-up (10 kΩ–1 MΩ to VOUT) for logic-level signaling. |
| 2 - VOUT | Regulated output voltage node | Must be bypassed with ≥10 µF low-ESR ceramic capacitor; ripple ≤45 mVp-p at 120 mA load. |
| 3 - VIN | Main power input | Accepts 2.0–5.5 V; recommended to decouple with ≥10 µF X7R ceramic close to pin. |
| 4 - GND | Ground reference terminal | Low-impedance connection to PCB ground plane required for noise immunity and thermal performance. |
| 5 - C− | Flying capacitor negative terminal | Connects to negative side of 1 µF ceramic CFLY; polarity-sensitive if using tantalum or electrolytic. |
| 6 - C+ | Flying capacitor positive terminal | Connects to positive side of 1 µF ceramic CFLY; forms charge-transfer path between VIN and VOUT. |
| 7 - SHDN | Active-low shutdown control | Logic high (≥1.4 V) enables operation; logic low (≤0.4 V) reduces supply current to 0.1 µA. |
| 8 - FB | Feedback input for adjustable output | Replaces SELECT pin in ADJ variants; senses resistor divider to set VOUT from 1.5 V to 5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Buck/Boost Auto-Switching | Enables regulation whether VIN is above or below VOUT - eliminates need for separate step-up/step-down converters in multi-rail systems. |
| 1 MHz Switching Frequency | Reduces required flying capacitor size to 1 µF (vs. 1.5 µF+ for 650 kHz), saving PCB area and cost in high-volume portable designs. |
| Integrated Soft-Start | Limits in-rush current during power-up or wake-up; achieves 90% VOUT regulation in ≤300 µs (5 V output), preventing system brownouts. |
| PGOOD with Hysteresis | Provides reliable power sequencing signal with 4% hysteresis - avoids chatter during marginal line/load conditions. |
| Thermal + Short-Circuit Protection | Foldback current limiting caps short-circuit output at ~200 mA (typical); thermal shutdown at 160°C prevents die damage under sustained overload. |
Applications
| White LED Backlighting | Smart Card Reader Supply |
|---|---|
|
Use Scenario: Driving 4–6 series white LEDs from a single Li-ion cell (2.7–4.2 V). IC Role / Device Role / Timing Role: Adjustable-output charge pump generating stable 18–24 V bias from low-input battery rail. Use Value: Eliminates inductor, reduces EMI, and maintains constant LED brightness across battery discharge curve. |
Use Scenario: Providing regulated 5 V supply to ISO 7816-compliant smart card interface in handheld POS terminals. IC Role / Device Role / Timing Role: Local 5 V regulator with PGOOD monitoring for secure power sequencing during card insertion/removal. Use Value: Ensures compliant voltage tolerance (±2.5%) and fast wake-up (<300 µs) for real-time card authentication protocols. |
| GSM SIM Interface Supply | PCMCIA Local 5 V Supply |
|
Use Scenario: Generating clean 3 V or 5 V SIM voltage from shared 3.3 V system rail in dual-SIM mobile handsets. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current DC/DC converter with shutdown control synchronized to modem activity. Use Value: Meets GSM TS 11.10 RF noise requirements while extending standby battery life via 0.1 µA shutdown current. |
Use Scenario: Delivering isolated 5 V to PCMCIA/CardBus peripherals in industrial laptops or docking stations. IC Role / Device Role / Timing Role: Compact, capacitor-only 5 V source with thermal protection for hot-plug scenarios. Use Value: Avoids inductor saturation risk during card insertion transients; supports 120 mA peak loads per slot. |
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 |
|---|---|---|---|
| MCP1252T-ADJI/MS | 650 kHz switching frequency; higher quiescent current (80 µA typ); same FB architecture and MSOP-8 package. | Requires larger 1.5 µF CFLY for 120 mA output; better suited for noise-sensitive IF bands where 1 MHz may cause interference. | Select when EMI constraints dominate over board area; verify ripple (50 mVp-p) meets system noise floor. |
| TPS60403DBVR | TI part: 500 kHz, fixed 3.3 V/5 V outputs only; no adjustable option; 110 mA max output; SOT-23-6 package. | Lacks FB pin and voltage adjustability; unsuitable for custom VOUT requirements; smaller footprint but lower current capability. | Choose only for simple fixed-output needs where MSOP-8 layout reuse is not required and 120 mA headroom is unnecessary. |
Compared with MCP1252T-ADJI/MS, the MCP1253T-ADJI/MS delivers faster transient response and smaller external components due to its 1 MHz frequency, while TPS60403DBVR offers a lower-pin-count alternative at the cost of flexibility and output current - making MCP1253T-ADJI/MS optimal for adjustable, high-density, medium-current applications.
Availability
MCP1253T-ADJI/MS is available at Aetrix Electronics and suitable for white LED backlighting, smart card reader power, GSM SIM interface supply, and PCMCIA local 5 V conversion requiring stable component supply across industrial temperature environments.
Supply support for MCP1253T-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 connectivity solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1253 belongs to Microchip's low-noise, inductorless charge pump DC/DC converter product line, designed specifically for compact, battery-powered applications needing efficient buck/boost conversion without magnetic components.
FAQ
What is the function of the FB pin on the MCP1253T-ADJI/MS?
The FB (Feedback) pin on the MCP1253T-ADJI/MS senses the output voltage via an external resistor divider to enable precise adjustable regulation from 1.5 V to 5.5 V. It references an internal 1.21 V bandgap (±0.03 V), and the output is calculated as VOUT = 1.21 V × (1 + R1/R2). This pin replaces the SELECT pin used in fixed-output variants like MCP1253T-33X50I/MS, confirming the MCP1253T-ADJI/MS is the adjustable version.
Does the MCP1253T-ADJI/MS support both buck and boost operation?
Yes, the MCP1253T-ADJI/MS automatically switches between buck and boost modes based on the relationship between VIN and the regulated VOUT. When VIN is less than VOUT, it operates in boost mode; when VIN exceeds VOUT, it operates in buck mode. This dual-mode capability is intrinsic to its switched-capacitor charge pump architecture and requires no external configuration - a core feature of the MCP1253T-ADJI/MS.
What is the maximum output current capability of the MCP1253T-ADJI/MS?
The MCP1253T-ADJI/MS delivers up to 120 mA continuous output current when VIN ≥ 3.0 V and VOUT ≤ 5.5 V, provided the flying capacitor (CFLY) is ≥1 µF and input/output capacitors meet Microchip's recommendations (≥10 µF ceramic, low-ESR). At lower VIN (e.g., 2.3 V), output current is derated to 80 mA - values confirmed in the Electrical Characteristics table of DS20001752C for the MCP1253-ADJ variant.
How does the PGOOD output behave during startup and fault conditions on the MCP1253T-ADJI/MS?
The PGOOD output on the MCP1253T-ADJI/MS is an open-drain signal that remains high-impedance until VOUT reaches 90% of nominal, then pulls low only if VOUT falls below 0.93×VOUT (typical) with 4% hysteresis. During startup, it transitions from high-Z to valid logic after ~300 µs (for 5 V output). It stays high-Z during shutdown (SHDN = low), and glitch immunity prevents false triggering for transients <200 µs - all behavior explicitly defined for MCP1253-ADJ in DS20001752C.
Is the MCP1253T-ADJI/MS qualified for automotive applications?
No, the MCP1253T-ADJI/MS is rated for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. While the base MCP1253 family includes AEC-Q100 qualified variants (e.g., MCP1253-ADJE/MS for extended temp), the "I" suffix in MCP1253T-ADJI/MS explicitly denotes industrial grade. For automotive use, designers must select the "E" temperature version and verify qualification status directly with Microchip documentation.
MCP1253T-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:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP1253T-ADJI/MS FAQ
1.How can I place an order for MCP1253T-ADJI/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1253T-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 MCP1253T-ADJI/MS reliable?
The price and inventory of MCP1253T-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 MCP1253T-ADJI/MS is usually 5 days.
3.What payment methods are accepted for MCP1253T-ADJI/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1253T-ADJI/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1253T-ADJI/MS?
MCP1253T-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1253T-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 MCP1253T-ADJI/MS?
For technical support, including MCP1253T-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1253T-ADJI/MS requirements.
6.How does Aetrix verify that MCP1253T-ADJI/MS is sourced from the original manufacturer or authorized distributors?
All MCP1253T-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 MCP1253T-ADJI/MS meets industry standards.
7.What is the process for return or replacement of MCP1253T-ADJI/MS?
All MCP1253T-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1253T-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 MCP1253T-ADJI/MS part is unused and in its original packaging.
Return procedure for MCP1253T-ADJI/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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