ZXLD1374

ZXLD1374

Document number: DS35032 Rev. 1 - 2

Page 4 of 35

www.diodes.com

October 2010

© Diodes Incorporated

A Product Line of

Diodes Incorporated

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Supply and reference parameters

Under-Voltage detection threshold

Normal operation to switch disabled

5.2

5.6

6.3

V

Under-Voltage detection threshold

Switch disabled to normal operation

5.5

6

6.5

V

PWM pin floating.

Output not switching

1.5

3

mA

150

300

µA

PWM pin grounded

for more than 15ms

90

150

µA

0.7

10

µA

Internal reference voltage

No load

1.237

1.25

1.263

V

ΔV

REF

Change in reference voltage with output

current

Sourcing 1mA

-5

mV

Sinking 25µA

5

Reference voltage line regulation

-60

-90

dB

Reference temperature coefficient

+/-50

ppm/°C

DC-DC converter parameters

External dc control voltage applied to ADJ

pin to adjust output current (Note 5)

DC brightness control mode

10% to 200%

0.125

1.25

2.5

V

ADJ input current (Note 5)

100

5

nA

µA

GI Voltage threshold for Boost and Buck-

boost modes selection (Note 5)

0.8

V

GI input current (Note 5)

100

5

nA

µA

PWM input current

36

100

µA

PWM pulse width

(to enter shutdown state)

PWM input low

10

15

25

ms

Thermal shutdown upper threshold

(LX output inhibited)

Temperature rising.

150

ºC

Thermal shutdown lower threshold

(LX output re-enabled)

Temperature falling.

125

ºC

High-Side Current Monitor (Pin ISM)

Input Current

11

20

µA

voltage

±0.25

±2

%

300

350

375

mV

Notes:

5. The ADJ and GI pins have an internal clamp that limits the internal node to less than 3V. This limits the switch current should

those pins get overdriven.