ADM1201AUJ [ADI]

IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, MO-193BA, TSOT-8, Power Management Circuit;


型号：	ADM1201AUJ
厂家：	ADI
描述：	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, MO-193BA, TSOT-8, Power Management Circuit 光电二极管
文件：	总6页 (文件大小：1698K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Simple Tracker

with Emergency Shutdown

Preliminary Technical Data

ADM1201

FEATURES

Functional Block Diagram

Enables Power Supply Tracking of multiple supplies

Up/Down Tracking limits Supply Differences to ~100mV

Capacitor Adjustable Slew Rate

OUT

2.7V - 16V

On Board Charge Pump Fully enhances FET

Emergency Shutdown Feature

CHARGE

PUMP

FET

In-Built Power Fail Detector Circuitry

Packaged in tiny 8-Lead TSOT Package

UP/DOWN

STOP

GATE

FET

DRIVER

DETECTOR

/ DOWN

LOGIC

APPLICATIONS

Multi-Voltage Supply Rail Tracker

Telecoms and Datacoms Systems

Multi voltage Network Processors

Multivoltage FPGAs, ASICs, DSPs

PC/Server Applications

SLEW

SLEW RATE

CONTROL

OUTFB

PFI

POWER FAIL

DETECTOR

SLEW

ADM1201

GND

GENERAL DESCRIPTION

The ADM1201 is a cascadable Simple Tracker ^TMdevice which

ensures that voltage rails track up and ramp 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 ADM1201 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.

Applications Diagram

5VIN

5VOUT

ADM1201

GATE

20nF

POWER ON/OFF

UP/DOWN

STOP

OUT

PFI

The Slew Rate of the ramp up and ramp down is adjustable via

an external capacitor on the C_SLEWpin and can be programmed

from 100V/s to 1000V/s. When multiple devices are cascaded

the C_SLEWpin 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.

EMERGENCY

SHUTDOWN

SLEW

GND

3.3VIN

3.3VOUT

ADM1201

The ADM1201 features an Up/Downb pin for external control

of the Up and Down tracking. A low-to-high transition on the

this input will initiate tracking power up sequence., while a

high-to-low will initiate a tracking down of the supply rails. A

STOPb pin is also available- a high-to-low on this pin will

initiate an emergency fast shutdown of the supply..

GATE

20nF

UP/DOWN

STOP

OUT

PFI

SLEW

GND

Power Fail Detector circuitry is also present. A resistor divider

on the PFI input will dictate what level the ADM1201 registers a

power fail on that supply. When a power fail is detected the

internal Power Fail Comparator will pull the STOPb pin down

which will shut down the output immediately. STOPb pins of

multiple ADM1201 devices may be tied together so that a fault

on any supply rail will cause all devices to go into emergency

shutdown.

2.8VIN

2.8VOUT

ADM1201

GATE

20nF

UP/DOWN

STOP

OUT

PFI

SLEW

GND

The ADM1201 is available in a tiny 8-pin TSOT package.

Rev. PrG

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

www.analog.com

2005

Preliminary Technical Data

ADM1201—SPECIFICATIONS

Table 1. V_CC= Full Operating Range, T_A= -40°C to +85°C, unless otherwise noted.

Parameter

Min

Typ

Max

Units

Conditions

V_CCPin

Operating Voltage Range Vcc

Undervoltage Lockout, V_UVLO

UVLO Hysteresis

Switched Voltage Range

Quiesent Current

Up/Downb Pin

2.7

2.4

16.5

2.65

2.525

Vcc Rising

0.65

16.5

1.0

0.65

Input Threshold

Input Threshold Hysteresis

Input Current

0.58

-100

0.58

0.6

0.62

100

0.62

Rising

Stopb Pin

Input Threshold

Input Threshold Hysteresis

Internal Pull Up

0.6

-5

Rising

µA

Output Low Voltage

Power Fail Detector, PFI Pin

PFI Detector Threshold

PFI Detector Hysterisis

PFI Input Current

C_SLEWPin

0.4

0.62

100

Note 1, Iload = 300uA

0.58

-100

0.6

-10

Slew up Current

µA

V/V

V/s

Slew down Current

Tracking Gain

Minimum Tracking Voltage

Maximum Tracking voltage

Slew Rate

0.1

Vcc – 0.3

V_SLEW/V_OUTFB

100

1000

V_OUTFBPin

-10

Input Current

µA

Voltage Range

Vcc

GATE Pin

Gate Pullup Current

Gate Pulldown Current

GATE Voltage, V_GATE

Vslew – Vout > 100mV

Vout – Vslew > 100mV

ADM1202-2 only –vgate = 3.0V

V_GATE– V_CC; V_CC= 2.7V

V_GATE– V_CC; V_CC= 5.0V

V_GATE– V_CC; V_CC= 16.5V

µA

6.5

NOTES:

¹Activated when voltage on PFI pin exceeds threshold

Rev. PrG | Page 2 of 6

Preliminary Technical Data

ADM1201

5VIN

5VOUT

ENABLING A SINGLE SUPPLY

The ADM1201 requires a supply voltage of 2.7V to 16.5V on its

Vcc pin for operation. The device may be powered from the

input supply rail that is being switched or from an auxiliary

supply.

ADM1201

GATE

20nF

POWER ON/OFF

UP/DOWN

STOP

OUTFB

PFI

EMERGENCY

SHUTDOWN

SLEW

GND

An internal charge pump ensures that the ADM1201 is capable

of fully enhancing an external FET via the GATE pin. An

external capacitor may be required on the GATE node for

stability.

3.3VIN

3.3VOUT

Power up can be externally initiated by driving the

UP/DOWNb logic pin high. A low on this pin will initiate a

power down. The V_OUTFBpin monitors the output voltage.

ADM1201

GATE

20nF

UP/DOWN

STOP

OUTFB

PFI

A single ADM1201 device may be used where a single supply

rail is required to switch on at a controlled slew rate (see Figure

1). The value of the slew rate capacitor, C_SLEW, will dictate the

slew rate of the GATE voltage at startup. An internal current

source charges C_SLEWand the GATE voltage is ramped at the

same rate.

SLEW

GND

2.8VIN

2.8VOUT

ADM1201

GATE

20nF

3.3VIN

3.3VOUT

UP/DOWN

STOP

OUTFB

PFI

SLEW

GND

ADM1201

GATE

20nF

POWER ON/OFF

UP/DOWN

STOP

OUTFB

PFI

EMERGENCY

SHUTDOWN

SLEW

Figure 2. ADM1201 Solution for Tracking 3 Supplies

GND

A low-to-high transition on the UP/DOWNb pin will initiate

turn-on of the supplies. The ADM1201 will begin to source

current into the C_SLEWcapacitor. The voltages on all GATE pins

will begin to rise, or “track” up, at the same rate, as set by the

value of C_SLEW. All supply voltages will remain within 100mV of

the C_SLEWvoltage until they level off at their full potentials.

Figure 1. ADM1201 Switching on a Single Supply

MULTI-SUPPLY TRACKING

A high-to-low on the UP/DOWNb pin of the ADM1201 will

initiate a tracking down of the supply rails, while a high-to-low

on the STOPb pin of the ADM1201 will initiate an emergency

fast shutdown of all supply rails simultaneously.

The primary function of the ADM1201 is to provide a voltage

tracking solution for multiple supply rails. The implementation

in Figure 2 will provide this function. Each voltage rail has its

own ADM1201 device driving a FET.

Figure 3 show power-up and power-down waveforms for the

ADM1201.

The UP/DOWNb pins of all devices can be driven by a single

logic input which will initiate a system power-up going high or

power-down going low.

The C_SLEWpins of all subsequent devices should be tied to the

supply that the controlled needs to be tracked with. If multiple

parts are configured as in Figure 2 then the C_SLEWcapacitor on

the first ADM1201 will set the slew rates for all devices.

Rev. PrG | Page 3 of 6

ADM1201

Preliminary Technical Data

(Condition 1) and a voltage is detected on the output

UP/DOWN

(Condition 2) when Power Fail Circuitry is enabled. The output

of the PFI block is internally connected to the STOPb pin. So if

a power fail condition on the output is detected after startup,

the STOPb will be pulled low internally, initiating an emergency

shutdown of the supply rail. When multiple ADM1201 devices

are cascades all STOPb pins may be wired together so that a

power fail on any output after start-up will initiate a system-

wide emergency shutdown of all supply rails.

STOP

3.3V

2.5V

1.5V

2.5V

1.5V

OUTPUT

VOLTAGES

Figure 3. ADM1201 Power-Up and Power-Down Waveforms

POWER FAIL DETECTOR

Figure 4 below shows the internal circuitry that enables the

Power Fail Detector. When the ADM1201 powers up initially

the Power Fail Detector is disabled. Two conditions must be

met before the Power Fail Detector is enabled:

ADM1201 Truth Table

UP/DOWNb

STOPb

GATE

(Output)

OFF

(Input)

(I/O)

1. The voltage on the slew rate capacitor, C_SLEW, must be

at or above V_CC. This ensures that the PFI Detector is

only enabled once the supply rail has been turned on.

OFF

2. The voltage on the PFI pin must be greater than 0.4V.

This ensures that some voltage greater than zero is

present on the output (and that a fault is not pulling

the output down).

* A high-to-low on STOPb will initiate an emergency

(fast) gate shutdown of all ADM1201 devices with STOPb

pins connected.

When the GATE is ramped up and the output is turned on

Figure 5. ADM1201 Power-Up and Power-Down Truth Table

Absolute Maximum Ratings

Table 2. ADM1201 Absolute Maximum Ratings

Parameter

Rating

20V

V_INPin

PFI Pin

20V

Logic Pins Up/Downb, Stopb

C_SLEWPin

20V

Gate Pin

Vcc +11V

20V

V_OUTPin

Power Dissipation

Storage Temperature

Operating Temperature Range

TBD

–65°C to +125°C

–40°C to +85°C

300°C

Lead Temperature Range

(Soldering 10 sec)

Junction Temperature

150°C

Rev. PrG | Page 4 of 6

Preliminary Technical Data

PIN CONFIGURATION

ADM1201

V_CC

UP / DOWN

ADM1201AUJ

PFI

GND

TOP VIEW

(Not to Scale)

GATE

C_SLEW

STOP

V_OUTFB

PIN FUNCTIONAL DESCRIPTIONS

Pin No.

Name

Description

UP/DOWNb

GND

Logic Pin. Drive high to initiate Power Up; Drive low to initiate Power Down.

Chip Ground Pin

STOPb

Logic Pin. Drive low trigger an emergency shutdown of all supply.

Monitors the Source of the external FET

VOUTFB

CSLEW

Connect to an external capacitor to control the slew rate of the of the GATE at turn on

(and turn-off for ADM1201-1).

GATE

PFI

Drives the GATE node of the external FET

Power Fail Detector Input Pin. A power fail fault is registered at a voltage of 0.6V on this

pin. An external resistor divider sets the output voltage that trips a power fail fault.

VCC

Chip Power Supply, 2.7V to 16.5V.

Rev. PrG | Page 5 of 6

ADM1201

Preliminary Technical Data

OUTLINE DIMENSIONS

Figure XX. 8-Lead TSOT Package (UJ-8)—Dimensions shown in millimeters

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.

Table 3. Ordering Guide

Part Number

Temperature Package

Package Description

Package Outline

ADM1201AUJ

–40°C to +85°C

TSOT

UJ-8

registered trademarks are the property of their respective companies.

Printed in the U.S.A.

PR05129-0-2/05(PrG)

Rev. PrG | Page 6 of 6

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