ADM1051 Analog Devices, ADM1051 Datasheet

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ADM1051

Manufacturer Part Number
ADM1051
Description
Precision Dual Voltage Regulator Controller
Manufacturer
Analog Devices
Datasheet

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a
SHDN2
SHDN1
ADM1051/ADM1051A
POWER-ON
V
V
RESET
CC
CC
V
CC
50 A
50 A
REFERENCE
GENERATOR
SHUTDOWN
SHUTDOWN
CLK/DELAY
FUNCTIONAL BLOCK DIAGRAM
BANDGAP
CONTROL
CONTROL
GND
V
CC
NO CONNECTION
ON ADM1051A
COMPARATOR
COMPARATOR
HICCUP
HICCUP
OSCILLATOR
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.
CLOCK
AMPLIFIER
AMPLIFIER
CONTROL
CONTROL
ADM1051/ADM1051A
Precision Dual Voltage
FORCE 1
SENSE 1
FORCE 2
SENSE 2
Regulator Controllers
3.3V
3.3V
V
V
IN
IN
2 100 F
2 100 F
100 F
100 F
V
V
OUT1
OUT2

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ADM1051 Summary of contents

Page 1

... 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 motherboard to select the output voltage. The ADM1051/ADM1051A operate from supply, which gives sufficient headroom for the amplifiers to drive external N-channel MOSFETs, operating as source-followers, as the external series pass devices ...

Page 2

... ADM1051/ADM1051A–SPECIFICATIONS Parameter OUTPUT VOLTAGE Channel 1 Channel 2 OUTPUT VOLTAGE ACCURACY Load Regulation Line Regulation 5 VSB Supply Voltage Required for Channel 2 Regulation CONTROL AMPLIFIER Control Amplifier Open-Loop Gain Control Amplifier Slew Rate Closed-Loop Settling Time Turn-On Time 1 Sense Input Impedance Force Output Voltage Swing, V ...

Page 3

... 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 the ADM1051/ADM1051A 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 ...

Page 4

... ADM1051/ADM1051A–Typical Performance Characteristics Tek S : Single Seq 50.0MS/ TOP 500mV Ch2 500mV M 1.00 s Ch1 Ch4 500mV 1.514 25 C 1.512 1.510 1.508 1.506 85 C 1.504 1.502 1.500 3.0 3.1 3.2 3.3 V – 1.8205 1.8200 1.8195 25 C 1.8190 1.8185 1.8180 1.8175 85 C 1.8170 1.8165 1 ...

Page 5

... M 1.00 s Ch2 B W Tek Single Seq 50.0ms/ S Ch2 20.0mV M 1.00 s Ch2 B W Tek Single Seq 50.0ms/ 85 Tek Single Seq 50.0ms/ –13.6 mV Tek 10.0kS/ 14.8 mV Ch1 10.0 V ADM1051/ADM1051A S Ch2 20.0mV 1.00 s Ch2 –16 Ch2 20.0mV M 1.00 s Ch2 10 Acqs S M 5.00ms Ch1 1.0 V ...

Page 6

... Power-On CC Reset threshold (6 V–9 V). POR does not apply to Channel 2 of the ADM1051A. This output will begin to rise as soon as there is sufficient gate drive to turn on the external MOSFET. The outputs from the ADM1051/ADM1051A are used to drive external N-channel MOSFETs, operating as source-followers. ...

Page 7

... Table II. TYPEDET and Shutdown Truth Table TYPEDET Don’t care. Note that when Channel 1 of the ADM1051 is set to 3.3 V, Channel 2 should not be shut down while Channel 1 is active. NORMAL OUTPUT < 0.8 V OUTPUT VOLTAGE REG ...

Page 8

... Hiccup Mode Fault Protection is a simple method of protecting the external power device without the added cost of external sense resistors or a current sense pin on the ADM1051/ADM1051A. In the event of a short-circuit condition at the output, the output voltage will fall. When the output voltage of a channel falls ...

Page 9

... ADM1051A, as shown in Figure 7. In this circuit from the 12 V rail via Schottky diodes. 5 VSB is always present when ac power is supplied to the system, so the ADM1051A is powered up, but V power supplies are turned on, the Channel 2 output will rise at the same rate as the 3.3 V rail until it regulates at 1.818 V. The 12 V supply will take over from 5 VSB when it exceeds the 5 VSB rail, and Channel 1 will then be subject to the POR delay ...

Page 10

... ADM1051/ADM1051A 0.0098 (0.25) 0.0040 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Small Outline Package (Narrow Body) (R-8) 0.1968 (5.00) 0.1890 (4.80 0.2440 (6.20) 0.1574 (4.00) 0.1497 (3.80) 0.2284 (5.80 PIN 1 0.0500 (1.27) BSC 0.102 (2.59) 0.094 (2.39) 8 0.0192 (0.49) 0 0.0098 (0.25) SEATING 0.0138 (0.35) PLANE 0.0075 (0.19) 0.0196 (0.50) 45 0.0099 (0.25) 0.0500 (1.27) 0.0160 (0.41) ...

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