Diodes ZXLD1371 - Manual (Page 5)

ZXLD1371
ZXLD1371
Document number: DS35436 Rev. 1 - 2
5 of 42
www.diodes.com
February 2012
© Diodes Incorporated
A Product Line of
Diodes Incorporated
Electrical Characteristics (Test conditions: V
IN
= V
AUX
= 12V, T
A
= 25°C, unless otherwise specified.)
Symbol Parameter Conditions Min Typ Max Units
Supply and reference parameters
V
UV-
Under-Voltage detection threshold
Normal operation to switch disabled
V
IN
or V
AUX
falling (Note 8) 4.5 V
V
UV+
Under-Voltage detection threshold
Switch disabled to normal operation
V
IN
or V
AUX
rising (Note 8) 4.9 V
I
Q-IN
Quiescent current into V
IN
PWM pin floating.
Output not switching
1.5 3 mA
I
Q-AUX
Quiescent current into V
AUX
150 300 µA
I
SB-IN
Standby current into V
IN
. PWM pin grounded
for more than 15ms
90 150 µA
I
SB-AUX
Standby current into V
AUX
. 0.7 10 µA
V
REF
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
V
REF_LINE
Reference voltage line regulation V
IN
= V
AUX
, 8.0V<V
IN
= <60V -60 -90 dB
V
REF-TC
Reference temperature coefficient ±50 ppm/°C
DC-DC converter parameters
I
ADJ
ADJ input current (Note 9)
V
ADJ
≤ 1.25V 100 nA
V
ADJ
= 5.0V 5 µA
V
GI
GI Voltage threshold for boost and buck-
boost modes selection (Note 9)
V
ADJ
= 1.25V 0.8 V
I
GI
GI input current (Note 9)
V
GI
≤ 1.25V 100 nA
V
GI
= 5.0V 5 µA
I
PWM
PWM input current V
PWM
= 5.5V 36 100 µA
t
PWMoff
PWM pulse width
(to enter shutdown state)
PWM input low 10 15 25 ms
T
SDH
Thermal shutdown upper threshold
(GATE output forced low)
Temperature rising. 150 ºC
T
SDL
Thermal shutdown lower threshold
(GATE output re-enabled)
Temperature falling. 125 ºC
High-Side Current Monitor (Pin ISM)
I
ISM
Input Current Measured into ISM pin V
ISM
= 12V 11 20 µA
V
SENSE_acc
Accuracy of nominal V
SENSE
threshold
voltage V
ADJ
= 1.25V
±0.25 ±2 %
V
SENSE-OC
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.