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PDF OZ811 Data sheet ( Hoja de datos )
| Número de pieza | OZ811 | |
| Descripción | Ultra High Efficiency DC-DC Controller | |
| Fabricantes | O2Micro International | |
| Logotipo |  |
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OZ811
Ultra High Efficiency DC-DC Controller
FEATURES
• DC-DC SMPS controller with integrated
drivers
• Constant ripple-current control allows
optimum inductor size
• High Efficiency up to 94%
• High light load efficiency (>85% at 100mA)
• VOUT accuracy 1%
• Input voltage from 3V to 30V
• Output voltage - adjustable from 0.5V to
2.75V
• Output current - up to 30A
• User adjustable operating frequency
• Dynamic voltage change support
• Voltage Feed-Forward Compensation
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
• Power Good signal
• ON/SKIP signal
• Soft-Start at start-up with OCT protection
• Soft-Stop at shutdown
APPLICATIONS
Power Supplies for Notebook CPU and Peripherals
ORDERING INFORMATION
Part Number Temp Range
OZ811LN
0oC to 85oC
Package
QFN16 (4x4) Lead-
Free
GENERAL DESCRIPTION
OZ811 is a DC/DC controller for the next generation of
microprocessor power supplies, their peripherals and
chipsets. OZ811 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 OZ811
the perfect choice for supplying low voltage CPU peripherals,
chipset cores, and graphics processors. OZ811 is a constant
ripple-current buck controller with powerful integrated drivers
able to drive output currents up to 30A.
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 OVP or UVP are triggered, the ON/SKIP pin should be
toggled or VDDA/VIN cycled to restart the circuit.
The output is protected against overload by valley current
type, cycle-by-cycle Over Current Protection (OCP) circuits.
The Under Voltage Lock Out circuit monitors both, VDDA and
VIN and allows controller operation 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 2V/ms and at shutdown the output voltage is
ramped down in a controlled manner with the same slew rate,
recovering the energy stored on the output capacitor and
extending battery life.
SIMPLIFIED APPLICATION DIAGRAM
PIN DIAGRAM
www.DataSheet4U.com
07/31/08
OZ811-SF-1.1
Copyright © 2004-2008 by O2Micro
All Rights Reserved
Patent #6,844,710; 6,965,221; 7,098,642, 7,202,650 and others pending
Page 1
1 page  
PACKAGE INFORMATION
Exposed pad is GNDA (pin 17) and must be fully soldered to PCB
OZ811
SEATING PLANE
www.DataSheet4U.com
Rth j-a (QFN-16 4x4mm package) = 38ºC/W
Rth j-c (QFN-16 4x4mm package) = 4.8ºC/W
OZ811-SF-1.1
Page 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet OZ811.PDF ] | |
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