Zxld1322, Electrical characteristics – Diodes ZXLD1322 User Manual
Page 5
ZXLD1322
ZXLD1322
Document number: DS32166 Rev. 3 - 2
5 of 17
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 IN <15V 480 500 520 mV T CO(REF) Internal Reference Temperature 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") 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 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 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 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
Coefficient
DC-DC Converter Input Parameters
start-up mode
ADJ pin to adjust output current
DC-DC Converter Output Parameters