MP3312 － 2.7V-5.5V INPUT, 38V OVP, DUAL-CHANNEL WHITE LED DRIVER

MP3312 Rev. 1.02

www.MonolithicPower.com

4

1/13/2015

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ELECTRICAL CHARACTERISTICS

(continued)

Parameters

Symbol

Condition

Min

Typ

Max

Unit

Protection

OVP Voltage

37

38

39.5

V

Cycle-Cycle Current Limit

Max Duty Cycle

1.2

1.8

A

Startup Current Limits

(5)

Max Duty Cycle

1

A

Time Step for Half Current Limit

(5)

6

ms

LEDx Threshold when No Switching

560

mV

LEDx Over Voltage Threshold

4.5

5

5.5

V

Thermal Shutdown Threshold

150

°C

Thermal Shutdown Hysteresis

25

°C

1-Wire Interface

1-Wire Detection Delay Time

100

μs

1-Wire Detection Time

260

μs

1-Wire Detection Window

1

ms

Start Time of Program Stream

2

μs

End Time of Program Stream

2

360

μs

High Time of Logic 0 Bit

5

180

μs

Low Time of Logic 0 Bit

360

μs

High Time of Logic 1 Bit

360

μs

Low Time of Logic 1 Bit

5

180

μs

Acknowledge Valid Time

2

μs

Duration of Acknowledge Signal

512

μs

Acknowledge Output Voltage Low

(6)

Open

drain,

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.