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Microchip Technology MCP1640DT-I/CHY
- Part No.:
- MCP1640DT-I/CHY
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-6
- Datasheet:
-
MCP1640DT-I/CHY.pdf
- Description:
- IC REG BOOST ADJ 350MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:19,196
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Product details
Overview
MCP1640DT-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), integrates N- and P-channel MOSFETs with RDS(ON) of 0.6 Ω and 0.9 Ω, and operates in automatic PFM/PWM mode at 500 kHz nominal switching frequency - enabling compact, high-efficiency power conversion in single-cell Li-ion or alkaline portable devices.
For engineers reviewing the MCP1640DT-I/CHY datasheet, MCP1640DT-I/CHY pinout, MCP1640DT-I/CHY application, or MCP1640DT-I/CHY equivalent, this page provides verified technical context, confirmed pin functions for the 8-lead 2×3 mm DFN package, real-world efficiency curves across input voltage and load, true-load-disconnect behavior during shutdown, and validated alternative options for low-input-voltage boost applications.
Technical Context
The MCP1640DT-I/CHY implements fixed-frequency peak-current-mode control with adaptive slope compensation and internal error amplifier compensation. Its dual-MOSFET synchronous rectification eliminates external diode losses, while low-noise anti-ringing control suppresses switch-node oscillations in discontinuous conduction mode.
This variant supports automatic PFM/PWM mode transition (per MCP1640/C family designation), enabling >96% typical efficiency at light loads via pulse-frequency modulation, and stable 500 kHz PWM operation under heavier loads. The device features true output disconnect (EN = GND disables both switches and removes input-to-output DC path), with <1 µA shutdown current and 750 µs soft-start time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-up Voltage | 0.65 V (typical, 3.3 VOUT @ 1 mA) - enables operation directly from deeply discharged alkaline or NiMH cells |
| Min Operating Input | 0.35 V (typical, 3.3 VOUT @ 1 mA) - sustains regulation down to near-dead battery voltage |
| Output Voltage Range | 2.0 V to 5.5 V (adjustable via resistor divider) - covers standard logic rails including 3.3 V and 5.0 V |
| Peak Switch Current | 850 mA (typical) - sets maximum deliverable output current based on input/output ratio and efficiency |
| Quiescent Current | 19 µA (typical, PFM mode, no load) - minimizes battery drain in standby without compromising start-up capability |
| Switching Frequency | 500 kHz (typical, PWM mode) - enables use of small 4.7 µH inductors and 10 µF ceramic output capacitors |
| Thermal Shutdown | 150 °C (typical, with 10 °C hysteresis) - protects against sustained overload or poor PCB thermal design |
Pinout & Package
Package: 8-lead 2 × 3 mm DFN with exposed thermal pad (EP); RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | Return path for high-current N-channel switch; must be connected to low-impedance ground plane |
| 2 (SGND) | Signal Ground | Reference for internal bias and error amplifier; externally tied to PGND on PCB |
| 3 (EN) | Enable Control Input | Logic-level input: >90% VIN enables, <20% VIN disables; controls true output disconnect |
| 4 (VOUTS) | Output Voltage Sense | Connects to feedback divider top node; senses regulated output for closed-loop control |
| 5 (VOUTP) | Output Voltage Power | High-current output path from integrated P-channel MOSFET; connects to output capacitor and load |
| 6 (SW) | Switch Node | Connection point for boost inductor; carries up to 800 mA peak current; internal junction of N- and P-MOSFETs |
| 7 (VIN) | Input Voltage Supply | Primary power input; requires ≥4.7 µF local decoupling to PGND |
| 8 (VFB) | Feedback Input | Accepts 1.21 V reference voltage from external resistor divider; 10 pA bias current enables high-value resistors |
| EP | Exposed Thermal Pad | Electrically isolated copper pad; must be soldered to PCB ground plane for thermal performance (θJA = 75 °C/W) |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | EN = GND fully isolates VOUT from VIN by disabling both MOSFETs - prevents battery drain and output discharge |
| Synchronous Rectification | Integrated 0.6 Ω N-MOSFET and 0.9 Ω P-MOSFET eliminate external Schottky losses and improve light-load efficiency |
| Low-Noise Anti-Ringing Control | Active damping of SW node ringing reduces EMI and eliminates need for snubbers in space-constrained designs |
| Internal Compensation | Complete Type-II compensation network embedded - no external capacitors or resistors required for stability |
| Inrush & Soft-Start Control | Programmed 750 µs soft-start and current-limited startup prevent output overshoot and battery stress during cold start |
Applications
| Wireless Sensor Node | Medical Wearable |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data via BLE at 1–10 s intervals. IC Role / Device Role / Timing Role: Primary 3.3 V supply from single AA/AAA alkaline cell; regulates output during RF transmit bursts. Use Value: 0.65 V start-up ensures full operational life from fresh to near-dead battery; 19 µA quiescent current extends shelf life beyond 2 years. |
Use Scenario: Portable pulse oximeter powered by CR2032 coin cell, requiring stable 3.3 V for analog front-end and MCU. IC Role / Device Role / Timing Role: Step-up regulator delivering regulated 3.3 V from 2.0–3.0 V coin cell; enables true shutdown between measurements. Use Value: True output disconnect (<1 µA shutdown current) preserves coin cell capacity during 99% idle time; low-noise operation avoids interference with sensitive analog signals. |
| Handheld Barcode Scanner | GPS Receiver Module |
|
Use Scenario: Portable scanner using laser diode and CMOS imager, powered by two NiMH cells (2.4 V nominal). IC Role / Device Role / Timing Role: Generates 5.0 V rail for laser driver and image sensor; handles pulsed 350 mA loads during scan events. Use Value: 350 mA output capability at 2.4 VIN/5.0 VOUT supports full-power scanning without brownout; PFM/PWM auto-switching maintains >90% efficiency across idle and active states. |
Use Scenario: Compact GPS module in asset tracker, operating from single-cell Li-ion (3.0–4.2 V) and requiring clean 3.3 V supply. IC Role / Device Role / Timing Role: Provides low-noise, tightly regulated 3.3 V for GPS RF frontend and baseband IC; maintains regulation during RF burst loading. Use Value: Anti-ringing control and internal compensation ensure minimal conducted/radiated noise into GPS L1 band; ±3% VOUT accuracy over -40°C to +85°C guarantees timing stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS61200DRCT | 0.3 V start-up (lower), 1.2 A switch current, no true disconnect - uses external diode in bypass mode | Lacks integrated true disconnect; requires external MOSFET for load isolation | Prefer when ultra-low start-up (<0.3 V) is critical and board space allows external FET for isolation |
| Analog Devices ADP5070ARMZ-R7 | Fixed 3.3 V/5.0 V outputs only, 400 mA max, 2.5 MHz switching - no adjustable VOUT or PFM mode | Not adjustable; limited to two preset outputs; higher frequency demands smaller magnetics but increases EMI risk | Choose when fixed-output simplicity outweighs flexibility, and 2.5 MHz operation fits system noise budget |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MCP1640DT-I/CHY uniquely combines true output disconnect, 0.65 V start-up, adjustable 2.0–5.5 V output, and integrated PFM/PWM optimization - making it optimal for battery longevity-critical portable medical and sensor applications where load isolation and deep-discharge utilization are mandatory.
Availability
MCP1640DT-I/CHY is available at Aetrix Electronics and suitable for wireless sensors, portable medical wearables, handheld instrumentation, and GPS modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1640DT-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 leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1640/B/C/D family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in single- and multi-cell battery-powered portable electronics - emphasizing start-up capability, true load isolation, and minimal external component count.
FAQ
What is the minimum input voltage required for MCP1640DT-I/CHY to start up and regulate 3.3 V output?
The MCP1640DT-I/CHY starts up at 0.65 V typical (measured with 3.3 VOUT and 1 mA resistive load). This ultra-low start-up voltage enables reliable operation directly from nearly depleted alkaline, NiMH, or Li-ion cells. Once started, it continues regulating down to 0.35 V typical input at 1 mA load - a key advantage for maximizing battery runtime in portable applications. The MCP1640DT-I/CHY achieves this via dedicated low-voltage start-up logic and weak-current charging of an internal soft-start capacitor.
Does MCP1640DT-I/CHY support true load disconnect during shutdown, and how is it implemented?
Yes, the MCP1640DT-I/CHY implements true output disconnect: when EN is pulled low, both the N-channel boost switch and P-channel synchronous rectifier are turned off, eliminating the parasitic body-diode path between VIN and VOUT. This provides complete DC isolation, reducing shutdown current to <1 µA and preventing battery drain or output capacitor discharge. Unlike bypass-mode variants (MCP1640C/D), the MCP1640DT-I/CHY does not connect VIN to VOUT during shutdown - a critical feature for systems requiring strict power domain separation.
What is the switching frequency behavior of MCP1640DT-I/CHY under varying load conditions?
The MCP1640DT-I/CHY operates in automatic PFM/PWM mode: at medium-to-heavy loads, it runs in fixed-frequency PWM mode at 500 kHz (±75 kHz); at light loads, it transitions to PFM mode, where switching pulses occur only as needed to maintain regulation - resulting in variable frequency and lower average current draw. This dual-mode operation delivers up to 96% typical efficiency across decades of load range. The MCP1640DT-I/CHY does not support forced PWM-only operation - that functionality is reserved for MCP1640B/D variants.
Can MCP1640DT-I/CHY be used to generate 5.0 V from a 3.3 V input, and what is the maximum achievable output current?
Yes, the MCP1640DT-I/CHY supports 5.0 V output from 3.3 V input, within its 2.0–5.5 V adjustable range. At 3.3 VIN/5.0 VOUT, it delivers up to 350 mA typical output current (per datasheet characterization). This capability stems from its 850 mA typical peak switch current limit and low RDS(ON) MOSFETs (0.6 Ω N-MOS, 0.9 Ω P-MOS). Efficiency remains >85% across this condition, enabling compact 5 V rail generation for USB peripherals or logic interfaces in space-constrained designs.
How does the internal compensation of MCP1640DT-I/CHY simplify design compared to external-compensated boost controllers?
The MCP1640DT-I/CHY integrates a complete Type-II compensation network - including error amplifier, poles/zeros, and adaptive slope compensation - eliminating the need for external capacitors or resistors. This reduces BOM count, PCB area, and design iteration time. Engineers only need to select the output inductor (4.7 µH typical) and input/output capacitors (4.7 µF/10 µF ceramic); stability is guaranteed across all operating conditions. The MCP1640DT-I/CHY's internal compensation also adapts to input/output voltage ratios, ensuring robust phase margin without manual tuning.
MCP1640DT-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
MCP1640DT-I/CHY FAQ
1.How can I place an order for MCP1640DT-I/CHY through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1640DT-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 MCP1640DT-I/CHY reliable?
The price and inventory of MCP1640DT-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 MCP1640DT-I/CHY is usually 5 days.
3.What payment methods are accepted for MCP1640DT-I/CHY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1640DT-I/CHY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1640DT-I/CHY?
MCP1640DT-I/CHY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1640DT-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 MCP1640DT-I/CHY?
For technical support, including MCP1640DT-I/CHY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1640DT-I/CHY requirements.
6.How does Aetrix verify that MCP1640DT-I/CHY is sourced from the original manufacturer or authorized distributors?
All MCP1640DT-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 MCP1640DT-I/CHY meets industry standards.
7.What is the process for return or replacement of MCP1640DT-I/CHY?
All MCP1640DT-I/CHY units undergo pre-shipment inspection (PSI). If there is an issue with MCP1640DT-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 MCP1640DT-I/CHY part is unused and in its original packaging.
Return procedure for MCP1640DT-I/CHY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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