•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 Figure6-3)
General Description
The MCP1661 device is a compact, high-efficiency,
fixed-frequency, non-synchronous step-up DC-DC
converter which integrates a 36V, 800m 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 200nA
(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 Table3-1.
SW
EN
V
IN
GND
MCP1661
SOT-23
V
FB
MCP1661
2x3 TDFN*
1
2
3
5
4
SW
S
GND
NC
P
GND
NC
1
2
3
4
8
7
6
5
V
IN
ENV
FB
EP
9
High-Voltage Integrated Switch PWM Boost Regulator with UVLO
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