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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Microchip Technology MCP1253-33X50I/MS

Name: MCP1253-33X50I/MS
Brand: Microchip Technology
SKU: MCP1253-33X50I/MS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP1253-33X50I/MS

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: MCP1253-33X50I/MS.pdf

Description:: IC REG CHARGE PUMP PROG 1 8MSOP

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Product details

Overview

MCP1253-33X50I/MS from Microchip Technology is a low-noise, inductorless, positive-regulated charge pump DC/DC converter delivering fixed 3.3V or 5.0V output with ±2.5% accuracy, 120 mA output current, and 1 MHz switching frequency. It operates from 2.0V–5.5V input across –40°C to +85°C and integrates thermal shutdown, short-circuit protection, and soft-start for battery-powered white LED backlighting and SIM interface supplies.

For engineers reviewing the MCP1253-33X50I/MS datasheet, MCP1253-33X50I/MS pinout, MCP1253-33X50I/MS application, or MCP1253-33X50I/MS equivalent, key selection criteria include selectable fixed-output voltage (3.3V/5.0V), ultra-low 80 µA quiescent current, 1 MHz operation enabling smaller external capacitors, MSOP-8 package footprint, and PGOOD monitoring capability.

Technical Context

The MCP1253-33X50I/MS employs a hysteretic bang-bang switched-capacitor charge pump architecture that automatically transitions between buck and boost modes depending on VIN relative to VOUT. Its 1 MHz internal oscillator enables use of 1 µF flying capacitor and reduces output ripple to 45 mV_p-p versus 50 mV_p-p for the 650 kHz MCP1252 variant.

Regulation is achieved via internal reference comparison (1.21V FB threshold) and open-drain PGOOD output asserting low when VOUT falls below 0.93×VOUT (typical), with 4% hysteresis. Shutdown mode reduces supply current to 0.1 µA (typical), and SELECT pin logic (VIN = 3.3V, GND = 5.0V) configures output without external resistors.

Key Specifications

Parameter	Value and Actual Design Meaning
VOUT Options	Fixed 3.3V or 5.0V selected by SELECT pin logic; no external feedback network required.
Switching Frequency	1 MHz - enables smaller 1 µF flying capacitor and reduced board area vs. 650 kHz alternatives.
Output Accuracy	±2.5% over full load and temperature range - ensures stable bias for white LED strings and flash memory supplies.
Max Output Current	120 mA at VIN ≥ 2.5V (3.3V mode) or VIN ≥ 3.0V (5.0V mode) - sufficient for 6-white-LED bias or PCMCIA 5V local supply.
Quiescent Current	80 µA typical - extends battery life in GSM phone SIM interfaces and smart card readers.
Shutdown Current	0.1 µA typical - supports deep-sleep power states in portable embedded systems.
Ripple Voltage	45 mV_p-p - low enough for noise-sensitive analog circuits like display bias without added LDO post-regulation.

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 per Microchip drawing.

Pin/Terminal	Circuit Role	Design Meaning
1 - PGOOD	Open-drain power-good flag	Asserts low when VOUT drops below 93% nominal; requires external pull-up for logic-level signaling to microcontroller.
2 - VOUT	Regulated output node	Connects to 10 µF ceramic output capacitor; delivers up to 120 mA with <45 mV_p-p ripple at 1 MHz.
3 - VIN	Main power input	Accepts 2.0V–5.5V; bypassed with 10 µF ceramic capacitor to suppress high-frequency switching noise.
4 - GND	Ground reference	Must connect to low-impedance ground plane to minimize EMI and ensure stable regulation.
5 - C-	Flying capacitor negative terminal	Completes charge-transfer path with C+; requires low-ESR ceramic capacitor (1 µF typical).
6 - C+	Flying capacitor positive terminal	Paired with C- to form flying capacitor; polarity critical if using tantalum or electrolytic types.
7 - SHDN	Active-low shutdown control	Logic-low disables all internal circuitry; compatible with 1.8V CMOS logic; draws only 0.1 µA in shutdown.
8 - SELECT	Output voltage select input	Driven to VIN for 3.3V output or GND for 5.0V output; no pull-up/down required.

Key Features

Feature	Design Value
Inductorless architecture	Eliminates magnetic components and EMI concerns; enables compact, low-profile designs for space-constrained mobile PCBs.
Soft-start circuitry	Limiting in-rush current during startup; achieves regulated output in ~300 µs (5V mode), preventing system brownouts.
Thermal & short-circuit protection	Shuts down at 160°C junction temp with 15°C hysteresis; foldback limits short-circuit current to 200 mA (typical).
AEC-Q100 qualified	Validated for automotive-grade reliability (Grade 3: –40°C to +85°C), supporting infotainment and body electronics applications.
Low-noise operation	45 mV_p-p output ripple at 1 MHz and minimal conducted EMI due to absence of inductive switching elements.

Applications

White LED Backlighting	Smart Card Readers
Use Scenario: Driving 4–6 parallel white LEDs from single-cell Li-ion (2.7V–4.2V) in handheld displays. IC Role / Device Role / Timing Role: Fixed-output charge pump generating stable 5.0V bias with low ripple to maintain uniform LED brightness. Use Value: Eliminates need for inductor-based boost converters; 120 mA output supports full brightness while 80 µA quiescent current preserves battery runtime.	Use Scenario: Providing regulated 3.3V supply to ISO 7816-compliant smart card interface in point-of-sale terminals. IC Role / Device Role / Timing Role: Low-noise, fast-wake-up DC/DC converter powering card detection and communication circuitry during intermittent active periods. Use Value: 0.1 µA shutdown current minimizes standby drain; PGOOD flag enables host MCU to verify supply readiness before initiating card transactions.
GSM Phone SIM Interface	PCMCIA Local 5V Supply
Use Scenario: Delivering 3.3V to SIM card slot in dual-SIM mobile handsets operating across wide input voltage range (2.3V–5.5V). IC Role / Device Role / Timing Role: Selectable-output charge pump configured for 3.3V mode, supporting dynamic voltage scaling as battery discharges. Use Value: ±2.5% output accuracy ensures reliable SIM communication; 1 MHz switching avoids interference with cellular RF bands.	Use Scenario: Generating local 5.0V rail for PCMCIA Type II peripheral cards in industrial data loggers powered by 3.3V system bus. IC Role / Device Role / Timing Role: Buck/boost converter stepping up 3.3V system rail to meet PCMCIA specification's 5.0V ±5% requirement. Use Value: 120 mA output sustains card initialization surge; MSOP-8 footprint fits tight connector-edge layouts without requiring external inductors.

White LED Backlighting

Smart Card Readers

Use Scenario: Driving 4–6 parallel white LEDs from single-cell Li-ion (2.7V–4.2V) in handheld displays.

IC Role / Device Role / Timing Role: Fixed-output charge pump generating stable 5.0V bias with low ripple to maintain uniform LED brightness.

Use Value: Eliminates need for inductor-based boost converters; 120 mA output supports full brightness while 80 µA quiescent current preserves battery runtime.

Use Scenario: Providing regulated 3.3V supply to ISO 7816-compliant smart card interface in point-of-sale terminals.

IC Role / Device Role / Timing Role: Low-noise, fast-wake-up DC/DC converter powering card detection and communication circuitry during intermittent active periods.

Use Value: 0.1 µA shutdown current minimizes standby drain; PGOOD flag enables host MCU to verify supply readiness before initiating card transactions.

GSM Phone SIM Interface

PCMCIA Local 5V Supply

Use Scenario: Delivering 3.3V to SIM card slot in dual-SIM mobile handsets operating across wide input voltage range (2.3V–5.5V).

IC Role / Device Role / Timing Role: Selectable-output charge pump configured for 3.3V mode, supporting dynamic voltage scaling as battery discharges.

Use Value: ±2.5% output accuracy ensures reliable SIM communication; 1 MHz switching avoids interference with cellular RF bands.

Use Scenario: Generating local 5.0V rail for PCMCIA Type II peripheral cards in industrial data loggers powered by 3.3V system bus.

IC Role / Device Role / Timing Role: Buck/boost converter stepping up 3.3V system rail to meet PCMCIA specification's 5.0V ±5% requirement.

Use Value: 120 mA output sustains card initialization surge; MSOP-8 footprint fits tight connector-edge layouts without requiring external inductors.

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
MCP1252-33X50I/MS	650 kHz switching frequency; higher 50 mV_p-p ripple; same pinout and SELECT logic.	Better suited for IF-band-sensitive applications where 1 MHz may cause interference; requires larger flying capacitor (1 µF still valid but less optimal).	Select when lower EMI in RF-adjacent zones is prioritized over board space savings.
TPS60403DBVR	TI part; 500 kHz; fixed 3.3V only; no SELECT pin; 60 mA max output; SOT-23-6 package.	Limited to 3.3V-only applications; insufficient current for 5V SIM or PCMCIA use; smaller footprint but lower capability.	Choose only for ultra-low-cost, low-current 3.3V bias where 120 mA and dual-voltage flexibility are unnecessary.

Compared with MCP1252-33X50I/MS and TPS60403DBVR, the MCP1253-33X50I/MS provides higher output current, dual-voltage configurability via SELECT, and superior ripple performance at 1 MHz-making it optimal for space-constrained, multi-rail portable designs requiring both 3.3V and 5.0V from a single IC.

Availability

MCP1253-33X50I/MS is available at Aetrix Electronics and suitable for white LED backlighting, smart card readers, GSM SIM interfaces, and PCMCIA local 5V supplies requiring stable component supply, automotive-grade reliability, and compact inductorless power conversion.

Supply support for MCP1253-33X50I/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 charge pump DC/DC converter product line, engineered specifically for battery-powered portable electronics needing efficient, inductorless voltage boosting or bucking with minimal external components and high reliability.

FAQ

What output voltages does the MCP1253-33X50I/MS support, and how is selection implemented?

The MCP1253-33X50I/MS supports fixed 3.3V and 5.0V outputs. Selection is implemented via the SELECT pin: connecting SELECT to VIN configures 3.3V output, while connecting SELECT to GND configures 5.0V output. No external resistors or feedback network are needed. This configuration is confirmed in DS20001752C-page 3 electrical tables and page 8 pin function description for MCP1253-33X50 variants.

Does the MCP1253-33X50I/MS require an inductor, and what external components are mandatory?

No, the MCP1253-33X50I/MS is an inductorless charge pump converter. Mandatory external components are three ceramic capacitors: 10 µF input (CIN), 10 µF output (COUT), and 1 µF flying capacitor (CFLY) between C+ and C– pins. These values are specified in DS20001752C-page 3 conditions and page 11 capacitor selection guidelines. Aluminum electrolytics are not recommended due to high ESR.

What is the purpose and behavior of the PGOOD pin on the MCP1253-33X50I/MS?

The PGOOD pin on the MCP1253-33X50I/MS is an open-drain output that signals regulation status. It remains high-impedance when VOUT is within regulation, pulls low when VOUT falls below 0.93×VOUT (typical), and includes glitch immunity for transients under 200 µs. During shutdown, PGOOD is high-impedance. A 10 kΩ–1 MΩ pull-up to VOUT is required for logic-level interfacing, as documented in DS20001752C-page 8 and page 10.

How does the MCP1253-33X50I/MS handle thermal overload, and what is its protection threshold?

The MCP1253-33X50I/MS features thermal shutdown with hysteresis: it disables operation when junction temperature exceeds 160°C (typical) and automatically recovers when die temperature cools by ~15°C. If overload persists, the device cycles on/off, producing pulsed output. This behavior is explicitly defined in DS20001752C-page 10 section 4.6 and confirmed in Absolute Maximum Ratings on page 3.

Is the MCP1253-33X50I/MS qualified for automotive applications, and what grade does it meet?

Yes, the MCP1253-33X50I/MS is AEC-Q100 qualified (Grade 3), rated for the industrial temperature range of –40°C to +85°C. While the "E" grade (–40°C to +125°C) exists for MCP1253-ADJ variants, the "I" suffix in MCP1253-33X50I/MS confirms its qualification for automotive infotainment, body control, and other Grade 3 applications per DS20001752C-page 1 and page 18 Product Identification System.

MCP1253-33X50I/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:: Programmable

Number of Outputs:: 1

Voltage - Input (Min):: 2.7V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 3.3V, 5V

Voltage - Output (Max):: -

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

MCP1253-33X50I/MS FAQ

1.How can I place an order for MCP1253-33X50I/MS through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP1253-33X50I/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 MCP1253-33X50I/MS reliable?

The price and inventory of MCP1253-33X50I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1253-33X50I/MS is usually 5 days.

3.What payment methods are accepted for MCP1253-33X50I/MS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1253-33X50I/MS transactions.

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4.How is shipping managed for MCP1253-33X50I/MS?

MCP1253-33X50I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP1253-33X50I/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 MCP1253-33X50I/MS?

For technical support, including MCP1253-33X50I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1253-33X50I/MS requirements.

6.How does Aetrix verify that MCP1253-33X50I/MS is sourced from the original manufacturer or authorized distributors?

All MCP1253-33X50I/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 MCP1253-33X50I/MS meets industry standards.

7.What is the process for return or replacement of MCP1253-33X50I/MS?

All MCP1253-33X50I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1253-33X50I/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 MCP1253-33X50I/MS part is unused and in its original packaging.

Return procedure for MCP1253-33X50I/MS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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