Diodes ZXLD1322 - Manual (Page 5)

ZXLD1322
ZXLD1322
Document number: DS32166 Rev. 3 - 2
5 of 17
www.diodes.com
April 2010
© Diodes Incorporated
A Product Line of
Diodes Incorporated
Electrical Characteristics
(Test conditions: V
IN
= 4V, T
AMB
= 25°C unless otherwise stated
(a)
)
DC-DC Converter Supply Parameters
Symbol Parameter Condition Min. Typ. Max. Unit
V
IN
Supply Voltage Normal Operation 2.5 15 V
V
IN(Start)
Supply voltage for start-up(b) Start-up mode 1.2 2.4 V
V
UV
-
Under-voltage detection threshold
normal operation to start-up mode
VIN falling 1.8 V
V
UV
+
Under-voltage detection threshold
start-up mode to normal operation
VIN rising 2.2 V
Iq Quiescent Current
Measured into V
IN
ADJ pin floating.
Excluding switch base current).
1.5 mA
I
STBY
Standby Current Measured into V
IN
. ADJ pin grounded 12 20 µA
V
REF
Internal Reference Voltage
ADJ pin floating
2.5V<V
IN
<15V
480 500 520 mV
T
CO(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, characterization 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 Parameter Condition Min. Typ. Max. Unit
V
SENSE
Peak switch current sense voltage
Measured on I
SENSE
pin CFB pin
at 0V
45 55 65 mV
V
SENSE
(SU)
Peak switch current sense voltage in
start-up mode Measured on I
SENSE
pin. Start-up
mode VIN = 1.2V
10.5 mV
I
SENSE
Sense input current
Measured into I
SENSE
with pin at
0V. CFB pin at 0V
-15 -7 -1 µA
C
FB
Control loop compensation capacitor 10
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
T
CO
(V
ADJ
)
Temperature coefficient of V
ADJ(th)
+0.3 %/K
R
ADJ
Internal resistor between V
REF
and
ADJ
V
ADJ
<550mV 100 k Ω
V
ADJ
(CLMP)
Clamp voltage on ADJ pin 100 μA injected into ADJ pin 575 mV
DC-DC Converter Output Parameters
Symbol Parameter Condition Min. Typ. Max. Unit
Toff(100) Discharge pulse width 100% Output current 0.7 1.2 1.7 µs
Toff(10) Discharge pulse width 10% Output current 4 8 12 µs
f
LXMAX
Maximum operating frequency 600 KHz
f
SU
Switching frequency in start-up mode VIN = 1.2V 50 KHz