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O2Micro International
O2Micro International

OZ813 Datasheet Preview

OZ813 Datasheet

Ultra High Efficiency Dual DC-DC Controller

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OZ813 pdf
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
Page 1



O2Micro International
O2Micro International

OZ813 Datasheet Preview

OZ813 Datasheet

Ultra High Efficiency Dual DC-DC Controller

No Preview Available !

OZ813 pdf
OZ813
PIN DESCRIPTION
No. Name I/O
1 ON/SKIP2 I
2 VIN I
3
VREF
O
4
TSET
P
5
VDDA
P
6 ON/SKIP1 I
7 VSET1
8 CS1N
9 CS1P
10 PGD1
11 LX1
12 HDR1
13 BST1
14 LDR1
15 GNDP
16 VDDP
17 LDR2
18 BST2
19 HDR2
20 LX2
www.DataSh21eet4U.comPGD2
22 CS2P
23 CS2N
24 VSET2
25 GNDA
I
I
I
O
P
O
P
O
P
P
O
P
O
P
O
I
I
I
P
Type
Digital
Analog
Analog
Power
Power
Digital
Analog
Analog
Analog
Digital
Power
Digital
Power
Digital
Power
Power
Digital
Power
Digital
Power
Digital
Analog
Analog
Analog
Power
Description
Enables Channel 2 operation.
If VON/SKIP2 > 0.6V, the Vout2 voltage ramps up to the voltage set on
VSET2 pin with a slew rate of 1V/ms. If VON/SKIP2 > 2.1V the controller
enters skip mode of operation. If both ON/SKIP1 and ON/SKIP2 pins are
< 0.4V the chip is disabled and enters a very low consumption mode <
1µA. To re-enable the controller the voltage on at least one of the
ON/SKIP pins need to exceed 1V. Once the chip is enabled the conditions
above applies.
Input voltage sense. Used for feed-forward compensation. Also monitored
by the Under Voltage Lock Out circuit. Let the controller operate only if
Vin > 2.5V. Must be connected to the input voltage of the power stage.
2.75V +/- 1% precision reference voltage. A 0.1µF should be placed from
VREF to GNDA.
Adjust the Ton of the controller according to the formula:
Ton = (1.6µs*VTSET)/(Vin-Vout)
A 0.1µF capacitor must be placed from TSET to GNDA.
+5V supply for the controller analog circuits. A 1µF capacitor should be
placed from VDDA to GNDA.
Enables Channel 1 operation.
If VON/SKIP1 > 0.6V, the Vout1 voltage ramps up to the voltage set on
VSET1 pin with a slew rate of 1V/ms. If VON/SKIP1 > 2.1V the controller
enters skip mode of operation. If both ON/SKIP1 and ON/SKIP2 pins are
< 0.4V the chip is disabled and enters a very low consumption mode <
1µA. To re-enable the controller the voltage on at least one of the
ON/SKIP pins need to exceed 1V. Once the chip is enabled the conditions
above applies.
Sets the Vout1 output voltage of the first controller.
Uses a resistor divider from the reference voltage.
Inverting current sense pin for channel 1.
Non-inverting current sense pin for channel 1.
Power Good output for Vout1.
It is an open drain output asserted high when the output voltage Vout1 is
within +125mV/-133mV of the set value.
Inductor switching node for channel 1.
Output of the high side driver for channel 1.
Positive supply for the high side driver of channel 1. A 0.1µF capacitor
should be placed between BST1 and LX1.
Output of the low side driver for channel 1.
Power Ground.
Positive supply for the low side driver. A 1µF capacitor should be placed
from VDDP to GNDP.
Output of the low side driver for channel 2.
Positive supply for the high side driver of channel 2. A 0.1µF capacitor
should be placed between BST2 and LX2.
Output of the high side driver for channel 2.
Inductor switching node for channel 2.
Power Good output for Channel2.
It is an open drain output asserted high when output voltage Vout2 is
within +125mV/-133mV of the set value.
Non-inverting current sense pin for channel 2.
Inverting current sense pin for channel 2.
Sets the Vout2 output voltage of the second controller.
Uses a resistor divider from the reference voltage.
Ground for the controller analog circuits.
OZ813-SF-v1.3
Page 2


Part Number OZ813
Description Ultra High Efficiency Dual DC-DC Controller
Maker O2Micro International
Total Page 8 Pages
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