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ADM6820 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM6820
Beschreibung (ADM6819 / ADM6820) FET Drive Simple Sequencers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 12 Seiten
ADM6820 Datasheet, Funktion
www.DataSheet4U.com
FEATURES
Single chip enables power supply sequencing of two
supplies
On-board charge pump fully enhances N-channel FET
Adjustable primary supply monitor to 0.618 V
Delay from primary supply to secondary supply enabled
Fixed 300 ms delay (ADM6819)
Capacitor adjustable delay (ADM6820)
Logic/analog driven enable input (ADM6819)
−40°C to +85°C operating range
Packaged in small 6-lead SOT-23 package
Pin-to-pin compatibility with MAX6819/MAX6820
APPLICATIONS
Multivoltage systems
Dual voltage microprocessors/FPGAs/ASICs/DSPs
Network processors
Telecom and datacom systems
PC/server applications
FET Drive Simple Sequencers®
ADM6819/ADM6820
FUNCTIONAL BLOCK DIAGRAM
VCC1
VCC2
VCC1
VCC2
Q1
UVLO
CHARGE
PUMP
VFET
R1
SETV
R2 0.618V
LOGIC
FET
DRIVER
GATE
VCC1
VCC2OUT
ADM6819/
ADM6820
TIMER
0.618V
GND
EN (ADM6819) - DIGITAL/ANALOG
SETD (ADM6820)
Figure 1.
GENERAL DESCRIPTION
The ADM6819 and ADM6820 are simple power supply sequencers
with FET drive capability for enhancing N-channel MOSFETs.
These devices can monitor a primary supply voltage and
enable/disable an external N-channel FET for a secondary
supply. The ADM6819 has the ability to monitor two supplies.
When more than two voltages require sequencing, multiple
ADM6819/ADM6820 devices can be cascaded to achieve this.
The devices operate over a supply range of 2.95 V to 5.5 V.
An internal comparator monitors the primary supply using the
VSET pin. The input to this comparator is externally set via a
resistor divider from the primary supply. When the voltage at
the VSET pin rises above the comparator threshold, an internal
charge pump on the GATE output enhances the secondary
supply FET.
The ADM6819 features an enable (EN) pin that is fed to the
input of an additional comparator and reference circuit. This
pin can be used as a digital enable or a secondary power good
comparator to monitor a second supply and enables the GATE
only if both supplies are valid. When both inputs of the internal
comparators are above the threshold, a fixed 300 ms timeout
occurs before the GATE is driven high and the secondary
supply is enabled.
The ADM6820 has only one comparator that is on the SETV
pin. It also features a timeout period that is adjustable via a
single external capacitor on the SETD pin.
The ADM6819/ADM6820 are packaged in small 6-lead SOT-23
packages.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.






ADM6820 Datasheet, Funktion
ADM6819/ADM6820
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VCC1, VCC2
SETV, SETD, EN
GATE
Storage Temperature
Operating Temperature Range
Lead Temperature (Soldering 10 sec)
Junction Temperature
Rating
−0.3 V to +6.0 V
−0.3 V to +30 V
−0.3 V to (VCCx + 11 V)
−65°C to +150°C
−40°C to +85°C
300°C
150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL CHARACTERISTICS
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
6-Lead SOT-23
θJA
169.5
Unit
°C/W
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. 0 | Page 6 of 12

6 Page









ADM6820 pdf, datenblatt
ADM6819/ADM6820
NOTES
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05113-0-7/06(0)
Rev. 0 | Page 12 of 12

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