Microchip MCP1661 Bedienungsanleitung


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2014-2015 Microchip Technology Inc. DS20005315B-page 1
MCP1661
Features
36V, 800 m Integrated Switch
Up to 92% Efficiency
High Output Voltage Range: up to 32V
1.3A Peak Input Current Limit:
- IOUT > 200 mA @ 5.0V VIN, 12V VOUT
- IOUT > 125 mA @ 3.3V VIN, 12V VOUT
- IOUT > 100 mA @ 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: 500 kHz
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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