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Microchip Technology MCP1640T-I/CHY
- Part No.:
- MCP1640T-I/CHY
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-6
- Datasheet:
-
MCP1640T-I/CHY.pdf
- Description:
- IC REG BOOST ADJ 350MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:19,148
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Product details
Overview
MCP1640T-I/CHY from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-voltage battery-powered systems. It starts up at 0.65V (typical, 3.3VOUT), delivers up to 350 mA output current (3.3VIN → 5.0VOUT), operates with 19 µA quiescent current in PFM mode, and integrates both N-Channel and P-Channel MOSFETs for high efficiency in portable medical sensors and Bluetooth headsets.
For engineers reviewing the MCP1640T-I/CHY datasheet, MCP1640T-I/CHY pinout, MCP1640T-I/CHY application, or MCP1640T-I/CHY equivalent, this page provides verified package mapping (8-Lead 2×3 mm DFN), confirmed PFM/PWM auto-switching behavior, validated true output disconnect functionality, and real-world load transient performance under 1–75 mA step changes.
Technical Context
The MCP1640T-I/CHY implements fixed-frequency (500 kHz typical) peak-current-mode control with adaptive slope compensation and lossless current sensing. Its internal architecture includes a transconductance error amplifier, integrated soft-start (750 µs), and dual-MOSFET synchronous rectification with RDS(ON) of 0.6 Ω (N-ch) and 0.9 Ω (P-ch) at 3.3V.
It supports automatic PFM/PWM transition below programmable load thresholds, uses 1.21 V feedback reference with ±3% output accuracy, and features overtemperature shutdown (150°C trip, 10°C hysteresis) plus input-to-output isolation during shutdown via true disconnect mode - all without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-Up Voltage | 0.65 V typical (3.3VOUT, 1 mA resistive load); enables operation from deeply discharged alkaline or Li coin cells. |
| Operating Input Range | 0.35 V minimum after start-up (3.3VOUT, 1 mA); supports single-cell NiMH/NiCd down to end-of-life voltage. |
| Output Voltage Range | 2.0 V to 5.5 V adjustable via external resistor divider; VFB = 1.21 V ±2.5% ensures stable regulation across temperature. |
| Peak Switch Current Limit | 850 mA typical; determines maximum deliverable output current (e.g., 350 mA @ 3.3VIN→5.0VOUT). |
| Quiescent Current | 19 µA typical in PFM no-load mode; reduces battery drain in always-on wireless sensor nodes. |
| Switching Frequency | 500 kHz nominal (425–575 kHz range); balances EMI, inductor size, and efficiency for compact PCB layouts. |
| Shutdown Current | < 1 µA in true disconnect state; eliminates parasitic discharge path between input and output. |
Pinout & Package
Package: 8-Lead 2 × 3 mm DFN with exposed thermal pad (EP). Thermal resistance θJA = 75 °C/W enables reliable operation at +85°C ambient with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | Return path for high-current N-Channel switch; must be low-inductance connection to minimize switching noise. |
| 2 (SGND) | Signal Ground | Reference for internal error amplifier and bias circuits; externally tied to PGND on PCB per datasheet layout guidance. |
| 3 (EN) | Enable Control Input | Logic-level input: >90% VIN enables, <20% VIN disables; supports system-level power sequencing with microcontroller GPIO. |
| 4 (VOUTS) | Output Voltage Sense | Connects to FB divider top node; senses regulated output for closed-loop control; separate from power path to reduce noise coupling. |
| 5 (VOUTP) | Output Voltage Power | High-current output path from P-Channel MOSFET; carries full load current to output capacitor and load. |
| 6 (SW) | Switch Node | Connection point for boost inductor; swings from VIN to ~VOUT + 0.3 V; requires tight layout to minimize EMI and ringing. |
| 7 (VIN) | Input Voltage Supply | Primary power input; decoupled with ≥4.7 µF ceramic capacitor placed adjacent to pin for low-ESR filtering. |
| 8 (VFB) | Feedback Input | Accepts 1.21 V reference voltage from external resistor divider; 10 pA bias current enables use of high-value resistors for low IQ. |
| 9 (EP) | Exposed Thermal Pad | Thermal interface only; electrically isolated but must be soldered to large copper pour for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | EN = GND removes DC path between VIN and VOUT using integrated P-Channel switch; isolates load from battery with <1 µA leakage. |
| Low-Noise Anti-Ringing Control | Integrated damping circuit suppresses high-frequency oscillations at SW node during discontinuous conduction mode, reducing radiated EMI. |
| Internal Synchronous Rectification | Eliminates external Schottky diode; N-Channel (0.6 Ω) and P-Channel (0.9 Ω) MOSFETs co-integrated for >96% peak efficiency at mid-load. |
| Inrush Current Limiting & Soft Start | 750 µs controlled ramp-up prevents output overshoot and input voltage sag during cold start from 0.65V sources. |
| Auto PFM/PWM Mode Switching | Seamlessly transitions to pulse-frequency modulation below ~10 mA load, cutting IQ to 19 µA while maintaining regulation. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered environmental sensor transmitting data via BLE every 5 seconds. IC Role / Device Role / Timing Role: Step-up regulator converting 1.2V alkaline cell output to stable 3.3V for MCU and radio. Use Value: 0.65V start-up enables full battery utilization; 19 µA quiescent current extends shelf life beyond 2 years. |
Use Scenario: Handheld glucose meter powered by single AAA alkaline cell. IC Role / Device Role / Timing Role: Generates precise 3.3V rail for analog front-end and display driver from declining battery voltage. Use Value: True disconnect mode prevents battery drain when device is off; ±3% VOUT accuracy ensures ADC reference stability. |
| Bluetooth Headset | Distributed +5.0V Supply |
Use Scenario: Compact headset requiring 5.0V for audio codec and RF section from 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Efficient boost converter delivering 300 mA at 5.0V with minimal thermal rise in sealed enclosure. Use Value: 500 kHz fixed frequency simplifies EMI filtering; synchronous rectification achieves 94% efficiency at 300 mA load. |
Use Scenario: Industrial controller board needing localized 5.0V supply from existing 3.3V rail. IC Role / Device Role / Timing Role: Point-of-load booster enabling higher-voltage peripherals without redesigning main PSU. Use Value: Adjustable output (2.0–5.5V) allows reuse across multiple board variants; internal compensation reduces BOM count by 3 components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Lower start-up voltage (0.3 V), but no true disconnect; 1.25 V feedback reference; 6-pin WSON package. | Lacks input-to-output isolation in shutdown; better suited for always-connected loads where standby IQ is secondary to start-up capability. | Select TPS61200DRCT only if sub-0.65V start-up is mandatory and true disconnect is not required. |
| MAX17222ELT+T | Higher IQ (25 µA PFM), 2.0–5.25 V output range, 1.225 V feedback; 6-pin µDFN package; no integrated bypass option. | Supports lower output voltage floor (2.0 V) but lacks input-to-output bypass mode; thermal shutdown threshold is 145°C (vs. 150°C). | Choose MAX17222ELT+T when footprint minimization is critical and 6-pin SOT-23 compatibility is needed over DFN thermal performance. |
Compared with TPS61200DRCT and MAX17222ELT+T, the MCP1640T-I/CHY uniquely combines true output disconnect, 0.65V start-up, and 8-lead DFN thermal performance - making it optimal for battery-sensitive portable devices requiring zero standby leakage and robust cold-start behavior.
Availability
MCP1640T-I/CHY is available at Aetrix Electronics and suitable for wireless sensors, portable medical monitors, Bluetooth headsets, and distributed power supplies requiring stable component supply across long-lifecycle industrial and consumer programs.
Supply support for MCP1640T-I/CHY 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for embedded control applications.
The MCP1640/B/C/D family was designed specifically for ultra-low-voltage battery-powered systems requiring high efficiency across wide load ranges - targeting portable medical, wearables, and energy-harvesting applications.
FAQ
What is the minimum input voltage required for MCP1640T-I/CHY to start regulating 3.3V output?
The MCP1640T-I/CHY starts regulating a 3.3V output at 0.65V typical input voltage with a 1 mA resistive load, as confirmed in DS20002234D-page 3. This ultra-low start-up voltage enables operation from nearly depleted alkaline or NiMH cells. The device sustains regulation down to 0.35V after start-up, supporting extended battery runtime in low-power applications.
Does MCP1640T-I/CHY support true output disconnect, and how is it implemented?
Yes, MCP1640T-I/CHY implements true output disconnect: when EN is pulled low, the internal P-Channel MOSFET turns off, eliminating the DC path between VIN and VOUT. This results in <1 µA shutdown current and prevents battery drain while preserving output voltage via external COUT. This behavior is explicitly documented for MCP1640 and MCP1640B variants in Table 4-1 and Section 4.1.3.
What is the switching frequency of MCP1640T-I/CHY, and is it adjustable?
The MCP1640T-I/CHY operates at a fixed nominal switching frequency of 500 kHz, with a specified range of 425–575 kHz across temperature and input conditions. This frequency is generated by an internal precision oscillator and is not user-adjustable. The fixed frequency simplifies EMI filter design and ensures consistent transient response in applications like Bluetooth headsets.
Can MCP1640T-I/CHY be used with a 5.0V output, and what are the current limitations?
Yes, MCP1640T-I/CHY supports 5.0V output via external resistor divider (2.0–5.5V range). At 3.3V input, it delivers up to 350 mA into 5.0V output, as verified in DS20002234D-page 1. Performance depends on inductor selection and PCB layout; maximum output current decreases at lower input voltages due to peak switch current limit constraints.
How does MCP1640T-I/CHY handle light-load efficiency, and what mode does it use?
MCP1640T-I/CHY automatically switches from PWM to PFM mode below ~10 mA load, reducing quiescent current to 19 µA typical while maintaining regulation. In PFM mode, it pulses at ~500 kHz to recharge the output capacitor, then enters a low-power coast phase. This behavior is intrinsic to the MCP1640/C variant family and is confirmed in Sections 4.1.1 and 4.2.3 of the datasheet.
MCP1640T-I/CHY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 350mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MCP1640T-I/CHY FAQ
1.How can I place an order for MCP1640T-I/CHY through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1640T-I/CHY 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 MCP1640T-I/CHY reliable?
The price and inventory of MCP1640T-I/CHY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1640T-I/CHY is usually 5 days.
3.What payment methods are accepted for MCP1640T-I/CHY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1640T-I/CHY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1640T-I/CHY?
MCP1640T-I/CHY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1640T-I/CHY 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 MCP1640T-I/CHY?
For technical support, including MCP1640T-I/CHY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1640T-I/CHY requirements.
6.How does Aetrix verify that MCP1640T-I/CHY is sourced from the original manufacturer or authorized distributors?
All MCP1640T-I/CHY 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 MCP1640T-I/CHY meets industry standards.
7.What is the process for return or replacement of MCP1640T-I/CHY?
All MCP1640T-I/CHY units undergo pre-shipment inspection (PSI). If there is an issue with MCP1640T-I/CHY, 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 MCP1640T-I/CHY part is unused and in its original packaging.
Return procedure for MCP1640T-I/CHY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1640T-I/CHY Tags
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