MP3312 － 2.7V-5.5V INPUT, 38V OVP, DUAL-CHANNEL WHITE LED DRIVER
MP3312 Rev. 1.02 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-Cycle Current Limit I
LIM
Max Duty Cycle 1.2 1.8 A
Startup 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
= 15 k
to V
IN
0.4 V
Notes:
5) guarantee by design and characterization
6) ACK signal is active 0 (when ACK signal is true , data line is pulled down by chip),and this signal only reply when RFA bit is set to 1.If you
want use ACK signal, the master should have an open-drain output, and data line should be pulled high by master with a resistor load.
