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ZXLD1321
Electrical characteristics ( Test conditions: VIN = 3V, T AMB = 25 ° C unless otherwise stated (a) )
DC-DC converter supply parameters
Symbol
V IN
Parameter
Supply voltage
Conditions
Normal operation
Min
2.0
Typ
Max
12
Units
V
V IN (Start)
Supply voltage for
start-up (b)
Start-up mode
1.2
2.4
V
V UV-
V UV+
Iq
Under-voltage detection threshold
Normal operation to start-up mode
Under-voltage detection threshold
Start-up mode to normal operation
Quiescent current
VIN falling
VIN rising
Measured into VIN
1.8
2.2
1.5
V
V
mA
ADJ pin floating.
(Excluding switch
base current).
I STBY
Standby current
Measured into VIN.
ADJ pin grounded
12
20
μA
V REF
Internal reference voltage
ADJ pin floating
2.0V<VIN<18V
480
500
520
mV
TCO (REF)
Internal reference temperature
coefficient.
50
ppm
/K
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 ° C are guaranteed by design, characterisation and process control.
(b) Between 1.2V and 2.2V the device will run in the Low Voltage Startup Mode (for details refer to section "Low Voltage Operation")
DC-DC converter input parameters
Symbol
V SENSE
V SENSE
(SU)
Parameter
Peak switch current sense
voltage
Peak switch current sense
voltage in start-up mode
Conditions
Measured on ISENSE
pin CFB pin at 0V
Measured on ISENSE
pin.
Start-up mode
Min
45
Typ
55
10.5
Max
65
Units
mV
mV
VIN=1.2V
I SENSE
Sense input current
Measured into
ISENSE with pin at
-15
-7
-1
μA
0V. CFB pin at 0V
C FB
Control loop compensation
capacitor
10
nF
V ADJ
External dc control voltage
applied to ADJ pin to adjust
DC brightness
control mode
50
500
mV
output current
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 ?
VADJ(clmp) Clamp voltage on ADJ pin
100μA injected into
575
mV
ADJ pin
Issue 1 - January 2008
? Zetex Semiconductors plc 2008
5
www.zetex.com
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