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MCP1624

Low-Voltage Input Boost Regulator



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MCP1624 pdf
MCP1623/24
Low-Voltage Input Boost Regulator
for PIC® Microcontrollers
Features
• Up to 96% Typical Efficiency
• 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
• Low Start-Up Voltage: 0.65V, 3.3V VOUT @ 1 mA
(typical)
• 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
• 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
• Available Packages:
- 6-Lead SOT-23
- 8-Lead 2 x 3 DFN
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 single-cell, two-cell, or three-cell alkaline,
NiCd, NiMH, and single-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.
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.
Package Types
MCP1623/24
6-Lead SOT-23
SW 1
6 VIN
GND 2
5 VOUT
EN 3
4 VFB
MCP1623/24
2x3 DFN*
VFB 1
8 VIN
SGND 2 EP 7 VOUTS
PGND 3 9 6 VOUTP
EN 4
5 SW
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2010-2016 Microchip Technology Inc.
DS40001420D-page 1



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MCP1624 pdf
MCP1623/24
Typical Application
VIN
0.9V to 1.7V
+ CIN
4.7 µF
-
L1
4.7 µH
SW
VOUT
VIN
EN VFB
GND
VOUT
3.3V
976 k
562 k
COUT
10 µF
VDD
PIC® MCU
VSS
FIGURE 1:
Typical Application Circuit.
FIGURE 2:
100
90 VIN = 2.5V
80 VIN = 1.2V
70
60
50
40
30
20
0.01
0.1
VIN = 0.8V
1 10
IOUT (mA)
MCP1624 Efficiency vs. IOUT, VOUT = 3.3V.
100
1000
DS40001420D-page 2
2010-2016 Microchip Technology Inc.



Part Number MCP1624
Description Low-Voltage Input Boost Regulator
Maker Microchip Technology - Microchip Technology
Total Page 30 Pages
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