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ACE714B Schematic ( PDF Datasheet ) - ACE Technology

Teilenummer ACE714B
Beschreibung Step-up DC/DC Converter Backlight Driver
Hersteller ACE Technology
Logo ACE Technology Logo 




Gesamt 5 Seiten
ACE714B Datasheet, Funktion
ACE714B
Step-up DC/DC Converter Backlight Driver
Description
The ACE714B is a fixed frequency, constant current step-up DC/DC converter ideal for driving LEDs
used in backlighting applications on cellular phones, PDAs and digital cameras etc. Output voltage of up
to 28V can be derived, and from a 2.5V input three white LED’s can be driven in series. Luminance of the
LED’s is controlled by changing the duty cycle of a PWM signal applied to the CE pin. In addition, an
internal MOSFET with an Rds-on of 0.3Ω is used. Allow profile and small board area solution can be
achieved using a chip coil and an ultra small ceramic output capacitor.
Features
Input voltage range : 2.5V-5.5V
Output voltage range : up to 28V
Low 104mV feedback voltage
Oscillation frequency : 1.2MHz
Typical Efficiency : 88%.
Control : PWM control.
Stand-by Current : <1μA
High Supply Capability: Deliver 10V 300mA from 3.5V supply
Lx limit Current : 1.3A
Application
For White LED Drivers
Mobil phones, PHS, PDAs, Digital still cameras
Absolute Maximum Ratings
Parameter
Symbol
Value
Unit
Vin Voltage
VIN
VSS-0.3~VSS+6
V
Output Voltage
VOUT
VSS-0.3~VSS+30
V
LX Voltage
VLX
VSS-0.3~VSS+30
V
FB Voltage
VFB
VSS-0.3~VSS+6
V
CE Voltage
VCE
VSS-0.3~+6
V
OVP Voltage
VOVP
VSS-0.3~VSS+30
V
Power Dissipation
PD 600 mW
Operating Junction Temperature
TOPR
-25 to +85
Storage Temperature Range
TSTG
-40 to +125
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These
values must therefore not be exceeded under any conditions.
VER 1.2 1





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