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PDF ADM6819 Data sheet ( Hoja de datos )
| Número de pieza | ADM6819 | |
| Descripción | (ADM6819 / ADM6820) FET Drive Simple Sequencers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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.
1 page  
ADM6819/ADM6820
VIN = 5V
VIN = 3.3V
VIN = 3.0V
R1
R2
Q1
VCC2
VCC1
GATE
ADM6819/
ADM6820
SETV EN/SETD
GND
R3
R4
Q2
VCC2
VCC1
GATE
ADM6819/
ADM6820
SETV EN/SETD
GND
VOUT = 5V
VOUT = 3.3V
VOUT = 3.0V
Figure 5. ADM6819/ADM6820 Solution for Sequencing Three Supply Rails
Rev. 0 | Page 5 of 12
5 Page 
OUTLINE DIMENSIONS
ADM6819/ADM6820
2.90 BSC
1.60 BSC
PIN 1
INDICATOR
1.30
1.15
0.90
0.15 MAX
65
4
12 3
2.80 BSC
1.90
BSC
0.95 BSC
1.45 MAX
0.22
0.08
0.50
0.30 SEATING
PLANE
10° 0.60
4° 0.45
0° 0.30
COMPLIANT TO JEDEC STANDARDS MO-178-AB
Figure 20. 6-Lead Small Outline Transistor Package [SOT-23]
(RJ-6)
Dimensions shown in millimeters
ORDERING GUIDE
Model
ADM6819ARJZ-REEL71
ADM6820ARJZ-REEL71
1 Z = Pb-free part.
Temperature Range
−40°C to +85°C
−40°C to +85°C
Package Description
6-Lead Small Outline Transistor Package [SOT-23]
6-Lead Small Outline Transistor Package [SOT-23]
Package Option
RJ-6
RJ-6
Branding
M2R
M2S
Rev. 0 | Page 11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ADM6819.PDF ] | |
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