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Microchip MCP1631

High-Speed, Pulse Width Modulator

Overview

TopologyBuck Converter
Input voltage3.5-16 V
Output 15 V
Output 23.3 V
IC revisionB

Description

The MCP1631/MCP1631V is a high-speed analog pulse width modulator (PWM) used to develop intelligent power systems. When combined with amicrocontroller, the MCP1631/MCP1631V will control the power system duty cycle providing output voltage or current regulation. The microcontroller can be used to adjust output voltage or current, switching frequency and maximum duty cycle while providing additionalfeatures making the power system more intelligent, robust and adaptable.Typical applications for the MCP1631/MCP1631V include programmable switch mode battery chargers capable of charging multiple chemistries, like Li-Ion, NiMH, NiCd and Pb-Acid configured as single or multiple cells. By combining with a smallmicrocontroller, intelligent LED lighting designs andprogrammable SEPIC topology voltage and currentsources can also be developed.The MCP1631/MCP1631V inputs were developed tobe attached to the I/O pins of a microcontroller fordesign flexibility. Additional features integrated into theMCP1631HV/MCP1631VHV provide signal conditioningand protection features for battery charger orconstant current source applications.For applications that operate from a high voltage input,the MCP1631HV and MCP1631VHV device optionscan be used to operate directly from a +3.5V to +16Vinput. For these applications, an additional low drop out+5V or +3.3V regulated output is available and canprovide current up to 250 mA to power a microcontrollerand auxiliary circuits.

Features

  • Programmable Switching Battery ChargerDesigns
  • High-Speed Analog PWM Controller(2 MHz Operation)
  • Combine with Microcontroller for “Intelligent”Power System Development
  • Peak Current Mode Control(MCP1631)
  • Voltage Mode Control (MCP1631V)
  • High Voltage Options Operate to +16V Input:
  • MCP1631HV Current Mode
  • MCP1631VHV Voltage Mode
  • Regulated Output Voltage Options:
  • +5.0V or +3.3V
  • 250 mA maximum current
  • External Oscillator Input sets SwitchingFrequency and Maximum Duty Cycle Limit
  • External Reference Input Sets Regulation Voltageor Current
  • Error Amplifier, Battery Current ISNS Amplifier,Battery Voltage VSNS Amplifier Integrated
  • Integrated Overvoltage Comparator
  • Integrated High Current Low Side MOSFETDriver (1A Peak)
  • Shutdown mode reduces IQ to 2.4 μA (typical)
  • Internal Overtemperature Protection
  • Undervoltage Lockout (UVLO)
  • Package Options:
  • 4 mm x 4 mm 20-Lead QFN(MCP1631/MCP1631V only)
  • 20-Lead TSSOP (All Devices)
  • 20-Lead SSOP (All Devices)

Typical applications

  • Supports Multiple Chemistries Li-Ion, NiMH, NiCd
  • LED Lighting Applications
  • High Input Voltage Programmable Switching
  • Constant Current SEPIC Power Train Design
  • USB Input Programmable Switching Battery

Products

Order Code Data­sheet Downloads Product seriesL1
(µH)
L2
(µH)
IR 1
(A)
IR 2
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres 1
(MHz)
Type Samples
744870100SPEC
8 files WE-DD SMT Shielded Coupled Inductor 10 10 2.7 2.7 7 0.038 0.038 0.044 0.044 18 Crossed
Order Code Data­sheet
744870100SPEC
Samples
Order Code Data­sheet Downloads Product seriesL1
(µH)
L2
(µH)
IR 1
(A)
IR 2
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres 1
(MHz)
Type Samples