MCP1623_11 Datasheet, PDF (1/28 Pages) Microchip Technology – Low-Voltage Input Boost Regulator for PIC® Microcontrollers

MCP1623/24
Low-Voltage Input Boost Regulator
for PIC^® Microcontrollers
Features:
• Up to 96% Typical Efficiency
• 425 mA Typical Peak Input Current Limit:
- I_OUT > 50 mA @ 1.2V V_IN, 3.3V V_OUT
- I_OUT > 175 mA @ 2.4V V_IN, 3.3V V_OUT
- I_OUT > 175 mA @ 3.3V V_IN, 5.0V V_OUT
• Low Start-up Voltage: 0.65V, typical 3.3V V_OUT
@ 1 mA
• Low Operating Input Voltage: 0.35V, typical
3.3V_OUT @ 1 mA
• Adjustable Output Voltage Range: 2.0V to 5.5V
• Maximum Input Voltage ≤ V_OUT < 5.5V
• Automatic PFM/PWM Operation (MCP1624)
• PWM-only Operation (MCP1623)
• 500 kHz PWM Frequency
• Low Device Quiescent Current: 19 µA, typical
PFM mode
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft-Start
• True Load Disconnect
• Shutdown Current (All States): < 1 µA
• Low Noise, Anti-Ringing Control
• Overtemperature Protection
• SOT-23-6 and 2 x 3 DFN-8 Package
Applications:
• One, Two and Three Cell Alkaline and NiMH/NiCd
Low-Power PIC^® Microcontroller Applications
General Description:
The MCP1623/24 is a compact, high-efficiency, fixed
frequency, synchronous step-up DC-DC converter. It
provides an easy-to-use power supply solution for PIC
microcontroller applications powered by either
one-cell, two-cell, or three-cell alkaline, NiCd, NiMH,
one-cell Li-Ion or Li-Polymer batteries.
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. The MCP1623
device option is available that operates in PWM-only
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.
Output voltage is set by a small external resistor
divider.
Packaging
MCP1623/24
6-Lead SOT-23
MCP1623/24
2x3 DFN*
SW 1
GND 2
EN 3
6 ^VIN
V_FB 1
8 V_IN
5 ^VOUT ^{SGND 2 EP 7 VOUTS}
P_GND 3
9
6 V_OUTP
4 V_FB
EN 4
5 SW
* Includes Exposed Thermal Pad (EP); see Table 3-1.
© 2011 Microchip Technology Inc.
DS41420C-page 1