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PDF ADM1203 Data sheet ( Hoja de datos )
| Número de pieza | ADM1203 | |
| Descripción | Simple Tracker | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Preliminary Technical Data
FEATURES
Enables Power Supply Tracking of multiple Supplies
Monitors Current on Supply being Tracked
Up/Down Tracking limits Supply Differences to ~100mV
Capacitor Adjustable Slew Rate
On Board Charge Pump Fully enhances FET
Ability to Track Down Supplies (ADM1203-1/3)
Emergency Shutdown Feature (ADM1203-2/4)
Auto retry after Current Fault (ADM1203-1/2)
Latch off after Current Fault (ADM1203-3/4)
Packaged in tiny 8-Lead TSOT Package
APPLICATIONS
Multi-Voltage Supply Rail Tracker
Telecoms and Datacom s Systems
Multi voltage Network Processors , FPGAs, ASICs, DSPs
PC/Server Applications
GENERAL DESCRIPTION
The ADM1203 is a cascadable Simple Tracker TM device which
ensures that voltage rails track within ~100mV of each other in
multi supply systems. Any number of these devices can be
cascaded to form a multi supply tracking solution.
The ADM1203 requires 2.7V to 16.5V on its Vcc pin to operate.
An on-board charge pump generates a high voltage GATE drive
to fully enhance FETs in the power path.
The Slew Rate of the ramp is adjustable via an external capacitor
on the CSLEW pin and can be programmed from 100V/s to
1000V/s. When multiple devices are cascaded the CSLEW pin of
each subsequent device should be tied to the output rail of the
previous device to ensure that supply will track up and down
with the previous supply.
The ADM1203 is offered in four variants. The ADM1203-1/3
features an UP/DOWNb pin and the ADM1203-2/4 features an
Up/STOPb pin. The ADM1203-1/2 features an auto retry on
current RS fault and the ADM1203-3/4 latches off. For all
devices, a high level on the input will initiate tracking power up
sequence. A low on the UP/DOWNb pin of the ADM1203-1/3
will initiate a tracking down of the supply rails, while a low on
the UP/STOPb pin of the ADM1203-2/4 will initiate an
emergency fast shutdown of all supply rails simultaneously.
The ADM1203 features a current sense comparator, which
monitors for an over current condition on the supply. In the
event of an over current condition, a fault is flagged and the gate
is switched off. The ADM1203-1/2 will auto retry this fault at
Rev. PrD
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. Trademarks and
registered trademarks are the property of their respective companies.
Simple Tracker TM with
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Circuit Breaker
ADM1203
every cycle determined by the capacitor on the TIMER pin and
the ADM1203-3/4 will latch off the gate until the
up/down(stop) pin is toggled.
The ADM1203 is packaged in a tiny 8-pin TSOT package.
Functional Block Diagram
Rs Q1
VIN
VCC RS-
VOUT
UP/DOWN
(ADM1203-1/3)
UP/STOP
(ADM1203-2/4)
CSLEW
CSLEW
CTIMER
CTIMER
VCC
LOGIC
FET
DRIVER
GATE
20nF
SLEW RATE
CONTROL
VOUT
TIMER
CONTROL
GND
ADM1203
Applications Diagram
5VIN
RSENSE
Q1
POWER ON/OFF
CSLEW
3.3VIN
Vcc RS-
UP/DOWN
GATE
ADM1203-1 1nF
SLEW
TIMER
CTIMER
VOUTFB
GND
RSENSE
Q1
POWER ON/OFF
2.7VIN
Vcc RS-
UP/DOWN
GATE
ADM1203-1 1nF
SLEW
TIMER
CTIMER
VOUTFB
GND
RSENSE
Q1
POWER ON/OFF
Vcc RS-
UP/DOWN
GATE
ADM1203-1 1nF
SLEW
TIMER
CTIMER
VOUTFB
GND
5VOUT
3.3VOUT
2.7VOUT
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 ©©22000053 Analog Devices, Inc. All rights reserved.
1 page  
Preliminary Technical Data
UP/DO WN
OUTP UT
V OLTAGE S
3.3V
2.5V
1.5V
Figure 3. ADM1203-1 Power-Up and Power-Down Waveforms
ADM1203
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CURRENT LIMIT CIRCUIT BREAKER FUNCTION
The ADM1203 features a current limiting circuit breaker.
When there is a sudden load current surge, such as a low
impedance fault, the bus supply voltage can drop significantly
to a point where the power to an adjacent card is
affected, causing system malfunctions. The ADM1203 fast
response current RS amplifier instantly limits current by
reducing the external FET GATE pin voltage. This
minimizes the bus supply voltage drop and permits power
budgeting and fault isolation without affecting neighboring
cards. A compensation circuit should be connected to
the GATE pin for current limit loop stability.
UP/STOP
OUTP UT
V OLTAGE S
3.3V
2.5V
1.5V
Figure 4. ADM1203-2 Power-Up and Power-Down Waveforms
SLEW RATE CONTROL
Voltage tracking is achieved by controlling the slew rate of a
rising or falling supply by an external capacitor on the SLEW
pin. Alternatively, this pin can be overdriven with a supply
which will result in the output following this supply. The gate
responds to maintain ~100mV between the VOUTFB pin and
the SLEW pin
CALCULATING CURRENT LIMIT
The nominal fault current limit is determined by a RS
resistor connected between VCC and the RS- pin as
given by the equation below:
ILIMIT(NOM) = VCB(NOM) / RRS
(1)
The minimum load current is given by Equation 2:
I = V / RLIMIT(MIN)
CB(MIN) RS(MAX)
(2)
The maximum load current is given by Equation 3:
I = V / RLIMIT(MAX)
CB(MAX) RS(MIN)
(3)
Note: The power rating of the RS resistor should be rated at the
fault current level. The RS resistor power rating must exceed
VCB(MAX)2 /RRS(MIN).
Figure 6. Tracking up Waveforms
Rev. PrD | Page 5 of 8
5 Page | ||
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| PDF Descargar | [ Datasheet ADM1203.PDF ] | |
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