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MCP16331

High-Voltage Input Integrated Switch Step-Down Regulator



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MCP16331 pdf
MCP16331
High-Voltage Input Integrated Switch Step-Down Regulator
Features:
• Up to 96% Efficiency
• Input Voltage Range: 4.4V to 50V
• Output Voltage Range: 2.0V to 24V
• 2% Output Voltage Accuracy
• Qualification: AEC-Q100 Rev. G, Grade 1(-40oC
to 125oC)
• Integrated N-Channel Buck Switch: 600 m
• Minimum 500 mA Output Current Over All Input
Voltage Range (See Figure 2-9 for Maximum
Output Current vs. VIN)
- Up to 1.2A Output Current at 3.3V and 5V
VOUT, VIN>12V, SOT-23 package at 25oC
ambient temperature
-
Up to 0.8A Output Current
VIN>18V, SOT-23 package
at
at
1225VoCVOamUTb, ient
temperature
• 500 kHz Fixed Frequency
• Adjustable Output Voltage
• Low Device Shutdown Current
• Peak Current Mode Control
• Internal Compensation
• Stable with Ceramic Capacitors
• Internal Soft-Start
• Internal Pull-Up on EN
• Cycle-by-Cycle Peak Current Limit
• Undervoltage Lockout (UVLO): 4.1V to Start;
3.6V to Stop
• Overtemperature Protection
• Available Package: 6-Lead SOT-23, 8-Lead 2x3
TDFN
Applications:
• PIC® MCU/dsPIC® DSC Microcontroller Bias
Supply
• 48V, 24V and 12V Industrial Input DC-DC
Conversion
• Set-Top Boxes
• DSL Cable Modems
• Automotive
• AC/DC Adapters
• SLA Battery Powered Devices
• AC-DC Digital Control Power Source
• Power Meters
• Consumer
• Medical and Health Care
• Distributed Power Supplies
2014 Microchip Technology Inc.
General Description:
The MCP16331 is a highly integrated, high-efficiency,
fixed frequency, step-down DC-DC converter in a
popular 6-pin SOT-23 or 8-pin TDFN 2x3 package that
operates from input voltage sources up to 50V.
Integrated features include a high side switch, fixed
frequency Peak Current Mode Control, internal
compensation, peak current limit and overtemperature
protection. Minimal external components are
necessary to develop a complete step-down DC-DC
converter power supply.
High converter efficiency is achieved by integrating the
current-limited, low-resistance, high-speed N-Channel
MOSFET and associated drive circuitry. High switching
frequency minimizes the size of external filtering
components resulting in a small solution size.
The MCP16331 can supply 500 mA of continuous
current while regulating the output voltage from 2.0V to
24V. An integrated, high-performance peak current
mode architecture keeps the output voltage tightly
regulated, even during input voltage steps and output
current transient conditions that are common in power
systems.
The EN input is used to turn the device on and off.
While off, only a few µA of current are consumed from
the input for power shedding and load distribution
applications. This pin is internally pulled up, so the
device will start even if the EN pin is left floating.
Output voltage is set with an external resistor divider.
The MCP16331 is offered in a space saving 6-Lead
SOT-23 and 8-Lead 2x3 TDFN surface mount package.
Package Type
MCP16331
6-Lead SOT-23
BOOST 1
6 SW
GND 2
5 VIN
VFB 3
4 EN
MCP16331
8-Lead 2x3 TDFN*
SW 1
8 VIN
EN 2 EP 7 BOOST
NC 3 9 6 VFB
NC 4
5 GND
* Includes Exposed Thermal Pad (EP); see Table 3-1
DS20005308B-page 1



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MCP16331 pdf
MCP16331
Typical Applications
VIN
4.5V to 50V
CIN
2x10 µF
VIN
6.0V to 50V
CIN
2x10 µF
BOOST
SW
VIN
EN
VFB
GND
1N4148
CBOOST L1
100 nF 15 µH
100V
Schottky
Diode
31.6 k
VOUT
3.3V at 500 mA
COUT
2 X10 µF
20 pF
optional
10 k
BOOST
SW
VIN
EN
VFB
GND
1N4148
CBOOST L1
100 nF 22 µH
100V
Schottky
Diode
52.3 k
VOUT
5.0V at 500 mA
COUT
2 X10 µF
20 pF
optional
10 k
Note: EN has an internal pull up, so the device will start even if the EN pin is left floating
100
90
80
70
60
50
40
30
20
10
0
10
VOUT=5V
VOUT=3.3V
100
Output Current (mA)
VIN=12V
1000
DS20005308B-page 2
2014 Microchip Technology Inc.



Part Number MCP16331
Description High-Voltage Input Integrated Switch Step-Down Regulator
Maker Microchip - Microchip
Total Page 30 Pages
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