zxld1322 Zetex Semiconductors plc., zxld1322 Datasheet - Page 5

• Manufacturer Part Number: zxld1322
• Description: Buck/boost Mode Dc-dc Converter For Led Driving With 700ma Output And Current Control
• Manufacturer: Zetex Semiconductors plc.

Electrical characteristics (Test conditions: VIN = 4V, T
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
(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
Issue 1 - January 2008
© Zetex Semiconductors plc 2008
Symbol
V
V
V
V
Iq
I
V
TCO
Symbol
V
V
(SU)
I
C
V
V
TCO
R
VADJ(clmp) Clamp voltage on ADJ pin
STBY
SENSE
ADJ
ADJ(th)
IN
IN
UV-
UV+
REF
SENSE
SENSE
FB
ADJ
+125°C are guaranteed by design, characterisation and process control.
(Start)
(VADJ)
(REF)
Supply voltage for start-up
Parameter
Supply voltage
Under-voltage detection threshold
normal operation to start-up mode
Under-voltage detection threshold
start-up mode to normal operation
Quiescent current
Standby current
Internalreference voltage
Internal reference temperature
coefficient.
Parameter
Peak switch current sense
voltage
Peak switch current sense
voltage in start-up mode
Sense input current
Control loop compensation
capacitor
External dc control voltage
applied to ADJ pin to adjust
output current
Switching threshold of ADJ pin Standby state to
Temperature coefficient of
VADJ(th)
Internal resistor between VREF
and ADJ
(b)
Conditions
Measured on ISENSE
pin CFB pin at 0V
Measured on ISENSE
pin.
Start-up mode
VIN=1.2V
Measured into
ISENSE with pin at
0V.CFB pin at 0V
DC brightness
control mode
Normal operation
VADJ<500mV
100µA injected into
ADJ pin
Conditions
Normal operation
Start-up mode
VIN falling
VIN rising
Measured into VIN
ADJ pin floating.
(Excluding switch
base current).
Measured into VIN.
ADJ pin grounded
ADJ pin floating
2.5V<VIN<15V
5
AMB
= 25°C unless otherwise stated
Min
480
2.5
1.2
Min
-15
45
50
26
Typ
500
10.5
+0.3
1.8
2.2
1.5
12
50
Typ
100
575
55
10
28
-7
ZXLD1322
www.zetex.com
Max
Max Units
520
500
2.4
15
20
65
30
-1
(a)
)
Units
ppm
%/K
mV
mV
mV
mV
mV
mA
mV
µA
kΩ
nF
µA
/K
V
V
V
V