TM
MP3204 – 6V, 1.3MHz WHITE LED DRIVER
ELECTRICAL CHARACTERISTICS
(continued)
V
IN
= V
EN
= 5V, T
A
= +25°C, unless otherwise noted.
Parameters
Enable
EN Threshold
EN Threshold
EN Hysteresis
EN Input Bias Current
Feedback
FB Voltage
FB Input Bias Current
Output Switch
SW On-Resistance
(4)
SW Current Limit
Thermal Shutdown
(4)
Notes:
4) Guaranteed by design, not tested.
Symbol
Condition
V
EN
Rising
V
EN
Rising, V
IN
= 2.5V
V
EN
= 0V, 5V
Min
1.0
0.8
Typ
1.35
90
Max
1.6
Units
V
V
mV
µA
mV
nA
Ω
mA
°C
1
94
-600
104
-300
0.5
350
160
114
V
FB
= 0.1V
R
ON
Duty Cycle = 60%
PIN FUNCTIONS
Pin #
1
2
3
Name
SW
GND
FB
Description
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power
inductor and output rectifier to SW. SW can swing between GND and 25V.
Ground.
Feedback Input. The MP3204 regulates the voltage across the current sense resistor
between FB and GND. Connect a current sense resistor from the bottom of the LED string
to GND. Connect the bottom of the LED string to FB. The regulation voltage is 104mV.
Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input
turns it off. When not used, connect EN to the input source for automatic startup.
The EN
pin cannot be left floating.
Over Voltage Input. OV measures the output voltage for open circuit protection. Connect
OV to the output at the top of the LED string.
Input Supply. This pin must be locally bypassed.
4
5
6
EN
OV
IN
MP3204 Rev. 1.3
9/23/2005
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