ZXLD1371

ZXLD1371

Document number: DS35436 Rev. 1 - 2

5 of 42

www.diodes.com

February 2012

© 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

4.5

V

Under-Voltage detection threshold

Switch disabled to normal operation

4.9

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

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

ADJ input current (Note 9)

100

nA

5

µA

GI Voltage threshold for boost and buck-

boost modes selection (Note 9)

0.8

V

GI input current (Note 9)

100

nA

5

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

(GATE output forced low)

Temperature rising.

150

ºC

Thermal shutdown lower threshold

(GATE output re-enabled)

Temperature falling.

125

ºC

High-Side Current Monitor (Pin ISM)

Input Current

11

20

µA

voltage

±0.25

±2

%

Over-current sense threshold voltage

300

350

375

mV

Notes:

8.

UVLO levels are such that all ZXLD1371 will function above 5.4V for rising supply voltages and function down to 5V for falling supply voltages.

9.

The ADJ and GI pins have an internal clamp that limits the internal node to less than 3V. This provides some failsafe should those pins get

overdriven.