Microchip MCP1642 Manual

Microchip Ikke kategoriseret MCP1642

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2014 Microchip Technology Inc. DS20005253A-page 1
MCP1642B/D
Features
• Up to 96% Typical Efficiency
• 1.8A Typical Peak Input Current Limit:
- IOUT > 175 mA @ 1.2V VIN, 3.3V VOUT
- IOUT > 600 mA @ 2.4V VIN, 3.3V VOUT
- IOUT > 800 mA @ 3.3V VIN, 5.0V VOUT
- IOUT > 1A @ VIN > 3.6V, 5.0V VOUT
• Low Start-Up Voltage: 0.65V, typical 3.3V V
OUT
@ 1 mA
• Low Operating Input Voltage: 0.35V, typical 3.3V
VOUT @ 1 mA
• Output Voltage Range:
- Reference Voltage, VFB = 1.21V
- 1.8V to 5.5V for the adjustable device option
- 1.8V, 3.0V, 3.3V and 5.0V for fixed V
OUT
options
• Maximum Input Voltage VOUT < 5.5V
• PWM Operation: 1 MHz
- Low Noise, Anti-Ringing Control
• Power Good Open-Drain Output
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft-Start
• Selectable, Logic-Controlled Shutdown States:
- True Load Disconnect Option (MCP1642B)
- Input-to-Output Bypass Option (MCP1642D)
• Shutdown Current (All States): 1 µA
• Overtemperature Protection
• Available Packages:
- 8-Lead MSOP
- 8-Lead 2x3 DFN
Applications
• One, Two and Three-Cell Alkaline, Lithium
Ultimate and NiMH/NiCd Portable Products
• Single-Cell Li-Ion to 5V Converters
• PIC® MCU Power
• USB Emergency Backup Charger from Batteries
• Personal Medical Products
• Wireless Sensors
• Hand-Held Instruments
• GPS Receivers
• +3.3V to +5.0V Distributed Power Supply
General Description
The MCP1642B/D devices are compact,
high-efficiency, fixed-frequency, synchronous step-up
DC-DC converters. This family of devices provides an
easy-to-use power supply solution for applications
powered by either one-cell, two-cell, or three-cell
alkaline, Ultimate Lithium, 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 voltage 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 the number of external
components. An open-drain Power Good output is
provided to indicate when the output voltage is within
10% of regulation and facilitates the interface with an
MCU. For standby applications, MCP1642B provides a
“true output disconnect” from input to output while in
shutdown (EN = GND). An additional device option
(MCP1642D) is available and connects “input to output
bypass” while in shutdown. Both options consume less
than 1 µA of input current.
For the adjustable (ADJ) device options, the output
voltage is set by a small external resistor divider. Fixed
VOUT device options do not require external divider
resistors. Two package options, 8-lead MSOP and 8-
lead 2x3 DFN, are available.
Package Types
PG
NC
VOUT
SGND
PGND
1
2
3
4
8
7
6
5SW
VIN
EN
EP
9
PGND
SGND
PG
VFB
VOUT
SGND
PGND
1
2
3
4
8
7
6
5 SW
VIN
EN
EP
9
6
1
2
3
8VIN
PGND
EN
VFB
PG
7SGND
5
4SW
VOUT
6
1
2
3
8VIN
EN
NC
PG
7
5
4 SWVOUT
MCP1642B/D-xx
MSOP
MCP1642B/D-xx
2x3 DFN*
MCP1642B/D-ADJ
MSOP
MCP1642B/D-ADJ
2x3 DFN*
* Includes Exposed Thermal Pad (EP); see Table 3-1.
1.8A Input Current Switch, 1 MHz Low-Voltage Start-Up
Synchronous Boost Regulator
MCP1642B/D
DS20005253A-page 2 2014 Microchip Technology Inc.
Typical Application
VIN
GND
VFB
VOUT
5.0V
COUT
4.7...10 µF
CIN
4.7...10 µF
L
4.7 µH
SW
976 k
309 k
EN
VOUT
+
-
ALKALINE
1 M
PG
ON
OFF
To PIC MCU I/O
+
-
ALKALINE
RTOP
RBOT RPG
VIN
GND
VOUT
3.3V
COUT
4.7...10 µF
CIN
4.7...10 µF
L1
4.7 µH
SW
EN
VOUT
+
-
ALKALINE
PG
ON
OFF
NC
0
10
20
30
40
50
60
70
80
90
100
1 10 100 1000
Efficiency (%)
I
OUT
(mA)
VIN = 2.5V, VOUT = 5.0V
VIN = 1.2V, VOUT = 3.3V
MCP1642B-33
MCP1642D-ADJ
From PIC®
MCU I/O
VIN= 0.9 to 1.6V
VIN= 1.8 to 3.2V

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MCP1642

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