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O2Micro International - Ultra High Efficiency Dual DC-DC Controller

Numéro de référence OZ813
Description Ultra High Efficiency Dual DC-DC Controller
Fabricant O2Micro International 
Logo O2Micro International 





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OZ813 fiche technique
OZ813
Ultra High Efficiency Dual DC-DC Controller
FEATURES
GENERAL DESCRIPTION
Dual DC-DC SMPS controller with
integrated drivers
Two constant ripple-current controllers
Constant ripple-current control allows
optimum inductor size
High full load efficiency; up to 94%
High light load efficiency; >85% at 100mA
Vout accuracy; 1% or better
Input voltage; from 3V to 26V
Output voltage – adj. from 0.5V to 2.75V
Output current - up to 15A
Independent
o Power Good signals
o ON/SKIP signals
Soft-Start at start-up
Soft-stop at shutdown
Voltage Feed-Forward Compensation
User adjustable operating frequency
Dynamic voltage change support
Output Protection:
o Latched Over Voltage Protection
o Latched Under Voltage Protection
o Valley type Over Current
Protection
Input Protection:
o Under Voltage Lock Out on VDDA
o Under Voltage Lock Out on VIN
APPLICATIONS
Power Supplies for Notebook CPU and Peripherals
ORDERING INFORMATION
Part Number
OZ813LN
Temp Range
Package
0oC to 85oC QFN24 Lead-Free
OZ813 is a DC/DC controller specially developed to design
power supplies for next generation microprocessors, their
peripherals and chipsets. OZ813 steps down the high battery
voltage to low output voltages in the range of 0.5V to 2.75V.
High efficiency, DC accuracy and excellent transient response
make OZ813 suitable for supplying low voltage CPU
peripherals, chipset cores, and graphics processors. OZ813
has two independent constant ripple-current buck controllers
with powerful integrated drivers able to drive output currents
up to 15A.
Voltage Feed-Forward compensation assures high rejection of
input voltage transients typically occurring when the AC
adapter is plugged in or removed.
Over Voltage Protection (OVP) acts when the output voltage
exceeds the set voltage by more than 125mV. This protection
condition is latched and initiates a ramp down of the output
voltage.
Under Voltage Protection (UVP) acts when the output voltage
falls below the set voltage by more than 133mV. This
protection condition is latched and initiates a ramp down of
the output voltage.
After an OVP or UVP event, the ON/SKIP pin should be
toggled or VDDA/VIN cycled to restart the circuit.
Both outputs are protected against overload by individual,
valley current type, cycle-by-cycle (Over Current Protection)
OCP circuits.
The Under Voltage Lock Out circuit monitors both, VDDA and
VIN and lets the controller operate only if VDDA > 4.3V and
VIN > 2.5V.
The Power Good signal is high as long as the output voltage
is within +125mV/-133mV of the set voltage. At startup the
output voltage ramps up in a controlled manner with a typical
slew rate of 1V/ms and at shutdown the output voltage is
ramped down in a controlled manner with the same slew rate.
SIMPLIFIED APPLICATION DIAGRAM
PIN DIAGRAM
www.DataSheet4U.com
07/31/08
OZ813-SF-v1.3
Copyright © 2004-2008 by O2Micro
All Rights Reserved
Patents #6,965,221; 7,202,650; 6,844,710; 7,098,642 and others pending
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