MP3312L － 2.7V-5.5V INPUT, 38V OVP, DUAL-CHANNEL WHITE LED DRIVER
MP3312L Rev. 1.0 www.MonolithicPower.com 4
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ELECTRICAL CHARACTERISTICS (continued)
V
IN
= 3.7V, V
EN
= V
PWM
= high, typical values are at T
A
= 25°C, unless otherwise noted.
Parameters Symbol Condition Min Typ Max Unit
Protection
OVP voltage V
OVP
37 38 39.5 V
Cycle-by-cycle current limit I
LIM
Max duty cycle 1.2 1.8 A
Start-up current limits
(5)
I
LIM_START
Max duty cycle 1 A
Time step for half current limit
(5)
T
LIM_HALF
6 ms
LEDx threshold when no switching 560 mV
LEDx over-voltage threshold V
OVP_LED
4.5 5 5.5 V
Thermal shutdown threshold T
ST
150 °C
Thermal shutdown hysteresis 25 °C
1-Wire Interface
1-wire detection delay time t
DELAY
100 s
1-wire detection time t
DETECTION
260 s
1-wire detection window t
WIN
1 ms
Start time of program stream t
START
2 s
End time of program stream tEOS 2 360 s
High time of logic 0 bit tH_LB 5 180 s
Low time of logic 0 bit tL_LB 3* tH_LB 360 s
High time of logic 1 bit tH_HB 3* tL_HB 360 s
Low time of logic 1 bit tL_HB 5 180 s
Acknowledge valid time tACKval 2 s
Duration of acknowledge signal tACK 512 s
Acknowledge output voltage low
(6)
VACKL
Open drain,
R
PULLUP
= 15k
to V
IN
0.4 V
NOTES:
5) Guaranteed by design and characterization.
6) ACK signal is active 0 (when ACK signal is true, the data line is pulled down by the chip). This signal only replies when the RFA bit is set
to 1. If you want to use the ACK signal, the master should have an open-drain output, and the data line should be pulled high by the
master with a resistor load.
