MCP1623/24
Low-Voltage Input Boost Regulator
for PIC® Microcontrollers
Features
General Description
• Up to 96% Typical Efficiency
The MCP1623/24 is
fixed-frequency, synchronous
a
compact, high-efficiency,
step-up DC-DC
• 425 mA Typical Peak Input Current Limit:
- IOUT > 50 mA @ 1.2V VIN, 3.3V VOUT
- IOUT > 175 mA @ 2.4V VIN, 3.3V VOUT
- IOUT > 175 mA @ 3.3V VIN, 5.0V VOUT
converter. It provides an easy-to-use power supply
solution for PIC® microcontroller applications powered
by either single-cell, two-cell, or three-cell alkaline,
NiCd, NiMH, and single-cell Li-Ion or Li-Polymer
batteries.
• Low Start-Up Voltage: 0.65V, 3.3V VOUT @ 1 mA
(typical)
Low-voltage technology allows the regulator to start up
without high inrush current or output voltage overshoot
from a low 0.65V input. High efficiency is accomplished
by integrating the low-resistance N-Channel Boost
switch and synchronous P-Channel switch. All
compensation and protection circuitry are integrated to
minimize external components. For standby
applications, the MCP1624 operates and consumes
only 19 µA while operating at no load.
• Low Operating Input Voltage: 0.35V, typical
3.3VOUT @ 1 mA
• Adjustable Output Voltage Range: 2.0V to 5.5V
• Maximum Input Voltage VOUT < 5.5V
• Automatic PFM/PWM Operation (MCP1624)
• PWM-Only Operation (MCP1623)
• PWM Operation: 500 kHz
• Low Device Quiescent Current: 19 µA, typical
PFM Mode
A “true” Load Disconnect mode provides input to output
isolation while disabled (EN = GND) by removing the
normal boost regulator diode path from input to output.
This mode consumes less than 1 µA of input current.
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft Start
• True Load Disconnect
Output voltage is set by a small external resistor
divider.
• Shutdown Current (All States): <1 µA
• Low Noise, Anti-Ringing Control
• Overtemperature Protection
• Available Packages:
Package Types
MCP1623/24
- 6-Lead SOT-23
6-Lead SOT-23
- 8-Lead 2 x 3 DFN
VIN
SW
GND
EN
1
6
5
4
VOUT
VFB
Applications
2
3
• One, Two and Three-Cell Alkaline and NiMH/NiCd
Low-Power PIC® Microcontroller Applications
MCP1623/24
2x3 DFN*
VFB
SGND
PGND
EN
VIN
8
1
2
VOUTS
VOUTP
SW
7
EP
9
3
4
6
5
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2010-2016 Microchip Technology Inc.
DS40001420D-page 1