alkaline or NiMH/NiCd as well as from one-cell Li-Ion or
Li-Polymer batteries.
The device integrates a 36V, 400m low-side switch,
which is protected by the 1.8A cycle-by-cycle inductor
peak current limit operation. The MCP1664 starts up
without high inrush current or output overshoot. All
compensation and protection circuitry is integrated to
minimize the number of external components.
The internal feedback (V
FB
) voltage is set to 300mV for
low power dissipation when sensing and regulating the
LED current. A single resistor sets the LED current.
The device features an UVLO which avoids start-up
with low inputs or discharged batteries for two
cell-powered applications.
The MCP1664 features an open load protection (OLP)
which turns off the operation in situations when the
LED string is accidentally disconnected or the feedback
pin is short-circuited to GND.
While in Shutdown mode (EN=GND), the device stops
switching, and consumes 40nA typical of input current.
The MCP1664 is AEC-Q100 qualified for automotive
applications.
Package Types
* Includes Exposed Thermal Pad (EP); see Table3-1.
SW
EN
V
IN
1
GND
2
P
GND
V
IN
NC
EN
V
FB
S
GND
SW
NC
MCP1664 SOT-23
V
FB
3
4
5
MCP1664 2mmx3mm TDFN*
1
2
3
4
8
7
6
5
EP
9
High-Voltage Step-Up LED Driver with UVLO and Open Load Protection
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