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
(-40°C to 125°C)
• Integrated N-Channel Buck Switch: 600 m
• Minimum 500 mA Output Current Over All Input
Voltage Ranges (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
+25°C ambient temperature
- Up to 0.8A output current at 12V VOUT,
VIN > 18V, SOT-23 package at
+25°C ambient 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 (STB)
• 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
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 2x3 TDFN 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 com-
ponents 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 regu-
lated, 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
VFB 3
5 VIN
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.
2014-2016 Microchip Technology Inc.
DS20005308C-page 1
