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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1633 Datasheet

Low-Side PWM Controller

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MCP1633
Low-Side PWM Controller with LED Dimming Capability
Features
• High Speed Current Mode Pulse-Width Modulator
(PWM) Controller
• Easy to Interface with PIC® Microcontroller for
Implementing High-Performance LED Drivers
• Integrated General Purpose Operational Amplifier
that can be Used for Current Sensing
• Internal Oscillator with Adjustable Frequency via
External Resistor
• External Synchronization Option for the Oscillator
• Internal Slope Compensation Circuit
• Current Sense to VEXT Response <120 ns Typical
• Internal Leading Edge Blanking Circuit for Current
Sense Input
• Programmable Current Sense Offset
• Internal Reference Voltage Generator
• Soft Start Capability
• Internal Push-Pull MOSFET Driver with 1A Peak
Current Capability
• Internal MOSFET Driver for Dimming/Load
Disconnect
• Input Voltage Range: 3V to 5.5V
• Undervoltage Lockout Circuit
• Output Overvoltage Protection
• Output Short Circuit Protection
• Overtemperature Protection
• Small 16-Pin QFN 3 x 3 mm Package
Applications
• LED Drivers
• Switch Mode Power Supplies
• Brick DC-DC Converters
General Description
The MCP1633 High Speed PWM Controller is a pulse-
width modulator developed for standalone power
supply applications. The MCP1633 design is based on
the MCP1632 PWM Controller but includes specific
blocks for PWM LED dimming. It is suitable for use in
topologies requiring a low side MOSFET, such as
Boost, Flyback, SEPIC, CUK, etc.
The MCP1633 uses Current Mode Control to provide
superior bandwidth and transient response, and also
cycle-by-cycle current limiting with adjustable peak
offset. The MCP1633 is also capable of operating in
Voltage Mode Control if required.
The switching frequency of the MCP1633 can be set by
an external resistor between 200 kHz and 2.2 MHz.
The MCP1633 reference voltage is adjustable by using
only one external resistor.
The MCP1633 integrates a current sense amplifier with
programmable gain using external resistors.
The MCP1633 can achieve high performance LED
dimming by “freezing” the compensation network and
load disconnect capability.
The MCP1633 integrates a high speed comparator with
a high performance error amplifier with a PWM latch to
perform the high speed analog Power Supply PWM
function.
Integrated Undervoltage Lockout, Overvoltage
protection and Overtemperature Protection make
designs using the MCP1633 robust over a range of
external conditions.
Package Type
3 x 3 x 0.9 mm QFN
2020 Microchip Technology Inc.
FSW 1
FAULT 2
SS/Ref 3
COMP 4
12 VCC
17 11 VEXT
EP 10 CS
9 CSO
See Table 3-1 for pin information
DS20006289A-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1633 Datasheet

Low-Side PWM Controller

No Preview Available !

MCP1633
Functional Block Diagram
EN
SYNC
Fs
UVLO
Overtemperature
SHDN
SS Reset
OSCILLATOR
0.3-2.2MHz
RAMP
CLK
6 kΩ
CS
CSO
20 μA
+ Blnk.
+
PWM
-
COMP
FB
50 μA
SS/REF
-
EA
+
2.7V
SS Reset
SQ
RQ
EP
AGND
VCC
VEXT
10 kΩ
+
- 1.23V
OVP
SDRV
PWM
FAULT
- ISN-
+ ISN+
IOUT
DS20006289A-page 2
2020 Microchip Technology Inc.


Part Number MCP1633
Description Low-Side PWM Controller
Maker Microchip
Total Page 3 Pages
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