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A Product Line of
Diodes Incorporated
ZXLD1374
Electrical Characteristics (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-
V UV+
I Q-IN
I Q-AUX
I SB-IN
I SB-AUX
V REF
Under-Voltage Detection Threshold
Normal Operation to Switch Disabled
Under-Voltage Detection Threshold
Switch Disabled to Normal Operation
Quiescent Current into V IN
Quiescent Current into V AUX
Standby Current into V IN .
Standby Current into V AUX .
Internal Reference Voltage
V IN or V AUX falling (Note 10)
V IN or V AUX rising (Note 10)
PWM pin floating.
Output not switching
PWM pin grounded for more than 15ms
No load
5.2
5.5
1.237
5.6
6
1.5
150
90
0.7
1.25
6.3
6.5
3
300
150
10
1.263
V
V
mA
μA
μA
μA
V
Δ V REF
V REF_LINE
V REF-TC
Change in Reference Voltage with Output
Current
Reference Voltage Line Regulation
Reference Temperature Coefficient
Sourcing 1mA
Sinking 25μA
V IN = V AUX , 6.5V < V IN = <60V
-5
-60
-90
+/-50
5
mV
dB
ppm/°C
DC-DC Converter Parameters
V ADJ
I ADJ
V GI
I GI
External DC Control Voltage Applied to ADJ Pin DC brightness control mode
to Adjust Output Current (Note 11) 10% to 200%
V ADJ ≤ 2.5V
ADJ Input Current (Note 11)
V ADJ = 5.0V
GI Voltage Threshold for Boost and Buck-Boost
V ADJ = 1.25V
Modes Selection (Note 11)
V GI ≤ 2.5V
GI Input Current (Note 11)
V GI = 5.0V
0.125
1.25
2.5
100
5
0.8
100
5
V
nA
μA
V
nA
μA
I PWM
PWM Input Current
V PWM = 5.5V
36
100
μA
t PWMoff
T SDH
T SDL
PWM Pulse Width
(to enter shutdown state)
Thermal Shutdown Upper Threshold
(LX output inhibited)
Thermal Shutdown Lower Threshold
(LX output re-enabled)
PWM input low
Temperature rising
Temperature falling
10
15
150
125
25
ms
°C
°C
High-Side Current Monitor (Pin ISM)
I ISM
Input Current
Measured into ISM pin and V ISM = V IN
11
20
μA
V SENSE_acc Accuracy of Nominal V SENSE Threshold Voltage
V SENSE-OC Over-Current Sense Threshold Voltage
V ADJ = 1.25V
300
±0.25
350
±2
375
%
mV
Notes:
10. UVLO levels are such that all ZXLD1374 will function above 6.5V for rising supply voltages and function down to 6.3V for falling supply voltages.
11. 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.
ZXLD1374
Document number: DS35032 Rev. 3 - 2
6 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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