Diodes ZXLD1320 - Manual (Page 5)

ZXLD1320
Issue 1 - January 2008 5 www.zetex.com
© Zetex Semiconductors plc 2008
Electrical characteristics ( Test conditions: VIN = 4V, T
AMB
= 25
°C unless otherwise stated (a) )
DC-DC converter supply parameters
NOTES:
(a) Production testing of the device is performed at 25
°C. Functional operation of the device and parameters specified from -40°C to
+125
° Care guaranteed by design, characterisation and process control.
DC-DC converter input parameters
Symbol Parameter Conditions Min Typ Max Units
V
IN
Supply voltage Normal operation 4.0 18 V
Iq Quiescent current Measured into VIN
ADJ pin floating.
(Excluding switch
base current). 1.5 mA
I
STBY
Standby current Measured into VIN.
ADJ pin grounded 12 20 µA
V
REF
Internal reference voltage ADJ pin floating
2.0V 480 500 520 mV
T
CO(REF)
Internal reference temperature
coefficient. 50 ppm
/K
Symbol Parameter Conditions Min Typ Max Units
V
SENSE
Peak switch current sense
voltage Measured on I
SENSE
pin CFB pin at 0V
45 55 65 mV
I
SENSE
Sense input current Measured into
ISENSE
with pin at
0V.
CFB pin at 0V
-15 -7 -1 µA
C
FB
Control loop compensation
capacitor 10 nF
V
ADJ
External dc control voltage
applied to ADJ pin to adjust
output current DC brightness
control mode 50 500 mV
V
ADJ(th)
Switching threshold of ADJ pin Standby state to
normal operation
26 28 30 mV
TCO
(VADJ)
Temperature coefficient of
VADJ(th) +0.3 %/K
R
ADJ
Internal resistor between VREF
and ADJ VADJ<500mV 100 k
Ω
VADJ(clmp) Internal clamp voltage on ADJ
pin
100µA injected into
ADJ pin 575 mV