1A STEP-DOWN CONSTANT CURRENT, HIGH EFFICIENCY LED DRIVER
The PAM2804 is a step-down constant current LED driver. When the
input voltage is down to lower than LED forward voltage, then
PAM2804 goes into LDO mode.
The PAM2804 supports a range of input voltages from 2.5V to 6.0V,
allowing the use of a single Li+/Li-polymer cell, 3AA or 4AA cell, USB,
and other standard power sources.
The FB voltage is only 0.1V to achieve high efficiency.
PAM2804 employs internal power switch and synchronous rectifier to
minimize external part count and realize high efficiency.
During shutdown, the input is disconnected from the output and the
shutdown current is less than 1µA. Other key features include
undervoltage lockout to prevent deep battery discharge of the Li+
3AA or 4AA Batteries Powered Flashlight
1 Cell Li-Ion Battery Powered Flashlight
Efficiency up to 93%
180µA(typ) Quiescent Current
Output Current: Up to 1A
Internal Synchronous Rectifier
1.5MHz Switching Frequency
Short LED Protection
Open LED Protection
5-Pin Small TSOT25 Packages
Typical Applications Circuit
Document number: DS36403 Rev. 3 - 2
ILED = 0.1/RS
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