My Inquiry
My Account
Microchip Technology MCP1253-ADJI/MS
- Part No.:
- MCP1253-ADJI/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1253-ADJI/MS.pdf
- Description:
- IC REG CHARGE PUMP ADJ 1 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,756
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP1253-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.
For engineers reviewing the MCP1253-ADJI/MS datasheet, MCP1253-ADJI/MS pinout, MCP1253-ADJI/MS application, or MCP1253-ADJI/MS equivalent, key selection criteria include its buck/boost operation without inductors, FB-based output adjustability, PGOOD monitoring, thermal/short-circuit protection, and MSOP-8 footprint compatibility with ceramic capacitor-only design.
Technical Context
The MCP1253-ADJI/MS employs a hysteretic (bang-bang) switched-capacitor charge pump architecture that automatically transitions between buck and boost modes based on VIN relative to VOUT. Its internal 1 MHz oscillator enables use of smaller flying capacitors (≥1 µF) versus lower-frequency variants, reducing board area and cost.
Regulation is achieved via feedback at the FB pin using a resistor divider referenced to a precise 1.21 V (±0.03 V) internal bandgap. The PGOOD output asserts low when VOUT falls below 0.93×VOUT (typical), with 4% hysteresis, and remains high-impedance during shutdown.
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 - set externally via FB resistor divider; limited to < 2×VIN for stability |
| Switching Frequency | 1 MHz - enables smaller CFLY (1 µF ceramic) and lower output ripple vs. 650 kHz MCP1252 |
| Output Accuracy | ±2.5% - guaranteed over full load (0–120 mA) and temperature (–40°C to +85°C) for fixed-select variants; FB tolerance adds ±1% error from resistor matching |
| Quiescent Current | 60 µA typical - enables >1-year battery life in always-on sensor nodes with 200 mAh coin cell |
| Shutdown Current | 0.1 µA typical - reduces system standby power to nanoamp level; compatible with 1.8 V logic control |
| Thermal Protection | 160°C trip with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 3.0 mm × 1.0 mm body, 0.65 mm pitch), RoHS-compliant, matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGOOD | Open-drain power-good flag | Signals regulation status; requires external pull-up (10 kΩ–1 MΩ to VOUT); high-Z when SHDN = low |
| 2 - VOUT | Regulated output node | Connects to 10 µF ceramic output capacitor; supplies load; maximum 120 mA continuous |
| 3 - VIN | Main input supply | Accepts 2.0–5.5 V; bypass with 10 µF ceramic near pin; low-ESR critical for ripple suppression |
| 4 - GND | Ground reference | Must connect to solid ground plane; shared return for VIN, VOUT, C-, C+, SHDN, FB |
| 5 - C- | Flying capacitor negative terminal | Connects to negative side of 1 µF ceramic CFLY; polarity-sensitive if using tantalum |
| 6 - C+ | Flying capacitor positive terminal | Connects to positive side of 1 µF ceramic CFLY; forms charge-transfer path with C- |
| 7 - SHDN | Active-low enable control | Logic-low disables all switching; draws only 0.1 µA; VIH ≥ 1.4 V, VIL ≤ 0.4 V |
| 8 - FB | Feedback input for adjustable output | Resistor divider (R1/R2) sets VOUT = 1.21 V × (1 + R1/R2); R2 ≤ 30 kΩ recommended |
Key Features
| Feature | Design Value |
|---|---|
| Buck/Boost Charge Pump | Inductorless topology delivers regulated output even when VIN < VOUT or VIN > VOUT - eliminates EMI-prone magnetics and saves board space |
| 1 MHz Switching Frequency | Enables use of 1 µF ceramic flying capacitor instead of larger 2.2 µF units required by 650 kHz MCP1252 - reduces BOM cost and footprint by ~30% |
| Soft-Start Circuitry | ~300 µs startup time to 90% VOUT - limits in-rush current during power-up or wake-from-shutdown, preventing brownout in shared rails |
| Integrated Protection | Thermal shutdown (160°C), foldback short-circuit current limit (~200 mA), and PGOOD fault detection - eliminates need for external supervision ICs |
| Low-Noise Operation | Typical 45 mVp-p output ripple at 1 MHz - suitable for noise-sensitive analog circuits (e.g., ADC references, RF bias) without additional LC filtering |
Applications
| White LED Backlighting | Smart Card Reader Power |
|---|---|
|
Use Scenario: Driving 4–6 series white LEDs from a single 3.6 V Li-ion cell in portable medical displays. IC Role / Device Role / Timing Role: Adjustable-output charge pump generating stable 18–24 V bias for LED strings, controlled via PWM dimming signal. Use Value: Eliminates bulky inductors and reduces EMI in handheld form factors while maintaining consistent LED brightness across battery discharge. |
Use Scenario: Providing isolated 3.3 V or 5.0 V supply to ISO 7816-compliant smart card interfaces in point-of-sale terminals. IC Role / Device Role / Timing Role: Local DC/DC converter delivering regulated voltage to card VCC pin with fast transient response to protocol handshaking pulses. Use Value: Ensures reliable card activation and data transfer under varying input (USB or battery) and load conditions, meeting ISO timing requirements. |
| PCMCIA Local 5 V Supply | GSM SIM Interface Supply |
|
Use Scenario: Generating clean 5 V from 3.3 V system rail to power legacy PCMCIA peripherals in industrial laptops. IC Role / Device Role / Timing Role: Boost-mode charge pump with PGOOD monitoring to confirm stable 5 V before enabling PCMCIA controller logic. Use Value: Enables backward compatibility without redesigning motherboard power architecture or adding discrete boost converters. |
Use Scenario: Supplying 3.0 V to GSM SIM cards during call setup and data transmission in feature phones. IC Role / Device Role / Timing Role: Low-quiescent-current regulator with shutdown control synchronized to modem sleep cycles. Use Value: Extends standby time by >20% versus linear regulators while meeting ETSI voltage tolerance specs (±5%) during RF bursts. |
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-ADJI/MS | 650 kHz switching frequency; higher output ripple (50 mVp-p); requires larger CFLY (≥2.2 µF) for same 120 mA output | Better suited for IF-band-sensitive designs where 1 MHz may interfere with 800–900 MHz GSM receivers | Select when EMI constraints outweigh size/cost benefits of 1 MHz operation |
| TPS60403DBVR | Fixed 3.3 V output only; no adjustable option; 600 kHz; 100 mA max output; different pinout (SOIC-8) | Limited to fixed-voltage use cases; lacks FB flexibility and PGOOD; not drop-in replaceable | Choose only for simple 3.3 V bias needs where design reuse of existing layout is prioritized over adjustability |
Compared with MCP1252-ADJI/MS, the MCP1253-ADJI/MS delivers faster transient response and smaller external components due to its 1 MHz frequency, while TPS60403DBVR offers lower cost but sacrifices output flexibility and protection features - making MCP1253-ADJI/MS optimal for new designs requiring compact, configurable, and robust local regulation.
Availability
MCP1253-ADJI/MS is available at Aetrix Electronics and suitable for white LED backlighting, smart card readers, PCMCIA local 5 V supplies, and GSM SIM interface power requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MCP1253-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 MCP1253 is part of Microchip's low-noise, inductorless charge pump DC/DC converter family, designed specifically for space-constrained, battery-powered applications needing efficient buck/boost conversion without magnetic components.
FAQ
What is the function of the FB pin on the MCP1253-ADJI/MS?
The FB (Feedback) pin on the MCP1253-ADJI/MS is the input to the internal error amplifier and sets the regulated output voltage via an external resistor divider. With a precise 1.21 V (±0.03 V) internal reference, VOUT = 1.21 V × (1 + R1/R2), where R2 must be ≤30 kΩ. This allows adjustment from 1.5 V to 5.5 V, provided VOUT < 2×VIN. The MCP1253-ADJI/MS uses this pin exclusively - unlike fixed-output variants that repurpose Pin 8 as SELECT.
Can the MCP1253-ADJI/MS operate with input voltages below 2.5 V?
Yes, the MCP1253-ADJI/MS supports VIN down to 2.0 V across its full operating temperature range. At 2.0 V input, it can still deliver up to 120 mA when boosting to outputs ≤3.3 V (e.g., 2.0 V → 3.3 V), though efficiency drops in boost mode. The datasheet specifies minimum VIN as 2.0 V for adjustable versions, with derated output current below 2.3 V - confirming viability for single-cell alkaline or NiMH applications.
How does the PGOOD output behave during shutdown of the MCP1253-ADJI/MS?
During shutdown (SHDN = low), the PGOOD output of the MCP1253-ADJI/MS enters a high-impedance state and does not actively drive low. It remains floating unless pulled externally. This behavior prevents false fault signaling when the device is intentionally disabled. Once SHDN returns high, PGOOD asserts high-impedance until VOUT reaches 93% of nominal, then transitions to active-low only if regulation is lost - ensuring clean sequencing in multi-rail systems.
What is the maximum output current capability of the MCP1253-ADJI/MS at 5.0 V output?
The MCP1253-ADJI/MS delivers up to 120 mA continuous output current at 5.0 V when VIN ≥ 3.0 V and ambient temperature is ≤+85°C. At lower input voltages (e.g., 2.7 V → 5.0 V boost), output current is reduced to 40 mA (min) per datasheet specifications. Thermal derating applies above +85°C ambient; the device includes thermal shutdown at 160°C to protect against sustained overload.
Is the MCP1253-ADJI/MS pin-compatible with the MCP1252-ADJI/MS?
Yes, the MCP1253-ADJI/MS is pin-compatible with the MCP1252-ADJI/MS in the same 8-lead MSOP package - sharing identical pinout, footprint, and terminal functions (PGOOD, VOUT, VIN, GND, C-, C+, SHDN, FB). The only functional difference is the internal oscillator frequency (1 MHz vs. 650 kHz), which affects external capacitor sizing and EMI profile but requires no PCB changes for drop-in replacement in most designs.
MCP1253-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:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP1253-ADJI/MS FAQ
1.How can I place an order for MCP1253-ADJI/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1253-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 MCP1253-ADJI/MS reliable?
The price and inventory of MCP1253-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 MCP1253-ADJI/MS is usually 5 days.
3.What payment methods are accepted for MCP1253-ADJI/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1253-ADJI/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1253-ADJI/MS?
MCP1253-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1253-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 MCP1253-ADJI/MS?
For technical support, including MCP1253-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1253-ADJI/MS requirements.
6.How does Aetrix verify that MCP1253-ADJI/MS is sourced from the original manufacturer or authorized distributors?
All MCP1253-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 MCP1253-ADJI/MS meets industry standards.
7.What is the process for return or replacement of MCP1253-ADJI/MS?
All MCP1253-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1253-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 MCP1253-ADJI/MS part is unused and in its original packaging.
Return procedure for MCP1253-ADJI/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1253-ADJI/MS Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
