Microchip MCP1661 Bedienungsanleitung
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2014-2015 Microchip Technology Inc.DS20005315B-page 1
MCP1661
Features
•36V, 800m Integrated Switch
•Up to 92% Efficiency
•High Output Voltage Range: up to 32V
•1.3A Peak Input Current Limit:
- IOUT > 200mA@ 5.0V VIN, 12V VOUT
- IOUT > 125mA@ 3.3V VIN, 12V VOUT
- IOUT > 100mA@ 4.2V VIN, 24V VOUT
•Input Voltage Range: 2.4V to 5.5V
•Undervoltage Lockout (UVLO):
-UVLO @ VIN Rising: 2.3V, typical
-UVLO @ VIN Falling: 1.85V, typical
•No Load Input Current: 250 µA, typical
•Sleep mode with 200 nA Typical Quiescent
Current
•PWM Operation with Skip mode: 500kHz
•Feedback Voltage Reference: VFB = 1.227V
•Cycle-by-Cycle Current Limiting
•Internal Compensation
•Inrush Current Limiting and Internal Soft Start
•Output Overvoltage Protection (OVP) in the event
of:
-Feedback pin shorted to GND
-Disconnected feedback divider
•Overtemperature Protection
•Easily Configurable for SEPIC or Flyback
Topologies
•Available Packages:
-5-Lead SOT-23
-8-Lead 2x3 TDFN
Applications
•Two and Three-Cell Alkaline, Lithium Ultimate and
NiMH/NiCd Portable Products
•Single-Cell Li-Ion to 5V, 12V or 24V Converters
•LCD Bias Supply for Portable Applications
•Camera Phone Flash
•Portable Medical Equipment
•Hand-Held Instruments
•Single-Cell Li-Ion to 3.0V or 3.3V SEPIC
Applications (see Figure 6-3)
General Description
The MCP1661 device is a compact, high-efficiency,
fixed-frequency, non-synchronous step-up DC-DC
converter which integrates a 36V, 800 m NMOS
switch. It provides a space-efficient high-voltage
step-up power supply solution for applications powered
by either two-cell or three-cell alkaline, Ultimate Lithium,
NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.
The integrated switch is protected by the 1.3A
cycle-by-cycle inductor peak current limit operation.
There is an output overvoltage protection which turns
off switching in case the feedback resistors are
accidentally disconnected or the feedback pin is
short-circuited to GND.
Low-voltage technology allows the regulator to start-up
without high inrush current or output voltage overshoot
from a low-voltage input. The device features a UVLO
which avoids start-up and operation with low inputs or
discharged batteries for two cell-powered applications.
For standby applications (EN=GND), the device stops
switching, enters Sleep mode and consumes 200 nA
(typical) of input current.
MCP1661 is easy to use and allows creating classic
boost, SEPIC or flyback DC-DC converters within a
small Printed Circuit Board (PCB) area. All
compensation and protection circuitry is integrated to
minimize the number of external components. Ceramic
input and output capacitors are used.
Package Types
* Includes Exposed Thermal Pad (EP); see Table 3-1.
SW
EN
VIN
GND
MCP1661
SOT-23
VFB
MCP1661
2x3 TDFN*
1
2
3
5
4
SW
SGND
NC
PGND
NC
1
2
3
4
8
7
6
5 VIN
ENVFB
EP
9
High-Voltage Integrated Switch PWM Boost Regulator with UVLO
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | MCP1661 |
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