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PDF ADM1051A Data sheet ( Hoja de datos )
| Número de pieza | ADM1051A | |
| Descripción | Precision Dual Voltage Regulator Controllers | |
| Fabricantes | Analog Devices | |
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a
Precision Dual Voltage
Regulator Controllers
ADM1051/ADM1051A
FEATURES
Two Independent Controllers on One Chip
1.515 V and 1.818 V Outputs
Shutdown Inputs to Control Each Channel
Compatible with PC Motherboard TYPEDET Signal
؎2.5% Accuracy Over, Line, Load, and Temperature
Low Quiescent Current
Low Shutdown Current
Works with External N-Channel MOSFETs for Low Cost
“Hiccup Mode” Fault Protection
No External Voltage or Current Setting Resistors
1.8 V/3.3 V ICH Sequenced Power-Up on ADM1051A
Small, 8-Lead SOIC Package
APPLICATIONS
Desktop Computers
Servers
Workstations
GENERAL DESCRIPTION
The ADM1051/ADM1051A are dual, precision, voltage regula-
tor controllers intended for power rail generation and active bus
termination on personal computer motherboards. They contain a
precision 1.2 V bandgap reference and two channels consisting of
control amplifiers driving external power devices. Each channel
has a shutdown input to turn off amplifier output and Hiccup
Mode protection circuitry for the external power device. The
shutdown input on the 1.5 V channel can also be used with the
TYPEDET signal on a PC motherboard to select the output voltage.
The ADM1051/ADM1051A operate from a 12 V supply, which
gives sufficient headroom for the amplifiers to drive external
N-channel MOSFETs, operating as source-followers, as the
external series pass devices. This has the advantage that N-
channel devices are cheaper than P-channel devices of similar
performance, and the circuit is easier to stabilize than one using
P-channel devices in a common-source configuration.
SHDN1
SHDN2
FUNCTIONAL BLOCK DIAGRAM
VCC
ADM1051/ADM1051A
BANDGAP
REFERENCE
CONTROL
AMPLIFIER
FORCE 1
VCC SENSE 1
50A
SHUTDOWN
CONTROL
HICCUP
COMPARATOR
VCC
50A
VCC
POWER-ON
RESET
NO CONNECTION
ON ADM1051A
CONTROL
AMPLIFIER
FORCE 2
SENSE 2
SHUTDOWN
CONTROL
HICCUP
COMPARATOR
CLK/DELAY
GENERATOR
CLOCK
OSCILLATOR
VIN
3.3V
100F
VOUT1
2؋100F
VIN
3.3V
100F
VOUT2
2؋100F
GND
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
1 page  
1.85
1.80
1.8V CHANNEL
1.75
1.70
1.65
1.60
1.55
1.50
1.45
1.5V CHANNEL
1.40
0 25 85
TEMPERATURE – ؇C
TPC 7. Regulator Output Voltage vs. Temperature
Tek STOP: Single Seq 50.0ms/S
ADM1051/ADM1051A
Tek Single Seq 50.0ms/S
Ch2 20.0mV BW M 1.00s Ch2 –16.8 mV
TPC 10. Transient Response Channel 2, 10 mA to 2 A
Output Load Step
Tek Single Seq 50.0ms/S
20.0mV BW M 1.00s Ch2 –13.6 mV
TPC 8. Transient Response Channel 1, 10 mA to 2 A
Output Load Step
Tek Single Seq 50.0ms/S
Ch2 20.0mV BW M 1.00s Ch2
10.4 mV
TPC 11. Transient Response Channel 2, 2 A to 10 mA
Output Load Step
Tek 10.0kS/S
4 Acqs
Ch2 20.0mV BW M 1.00s Ch2
14.8 mV
TPC 9. Transient Response Channel 1, 2 A to 10 mA
Output Load Step
Ch1 10.0 V
M 5.00ms Ch1
1.0 V
TPC 12. Force Output in Hiccup Mode, Channel 1
REV. 0
–5–
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ADM1051A.PDF ] | |
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