ANALOG DEVICES ADM4210 Service Manual

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Hot Swap Controller

FEATURES

Controls supply rails from 2.7 V to 16.5 V
Allows protected board removal and insertion to a live

backplane

External sense resistor provides adjustable analog current

limit with circuit breaker
Peak fault current limited with fast response
Charge pumped gate drive for external N-FET switch
Automatic retry or latch-off during current fault
Undervoltage lockout
Low profile (1 mm), 6-lead, TSOT package
Pin compatible with LTC4210-1 and LTC4210-2

APPLICATIONS

Hot swap board insertion: line cards, raid systems
Industrial high-side switches/circuit breakers
Electronic circuit breakers

GENERAL DESCRIPTION

The ADM4210 is a hot swap controller that safely enables a
printed circuit board to be removed and inserted to a live
backplane. This is achieved using an external N-channel power
MOSFET with a current control loop that monitors the load
current through a sense resistor. An internal charge pump is
used to enhance the gate of the N-channel FET. When an
overcurrent condition is detected, the gate voltage of the FET is
reduced to limit the current flowing through the sense resistor.
During an overcurrent condition, the TIMER cap determines
the amount of time the FET remains at a current limiting mode

CLR

of operation until it is shut down. The ON (ON­enable input for the device and can be used to monitor the
input supply voltage. The ADM4210 operates with a supply
voltage ranging from 2.7 V to 16.5 V.

) pin is the

in 6-Lead TSOT Package

ADM4210

FUNCTIONAL BLOCK DIAGRAM

R

ON

C

TIMER

0.22µF

V

1.3V

CC

TIMER

SENSE

0.01Ω

SENSE

GATE
DRIVE/
LOGIC

ADM4210

GND

Q

GATE

V

ON

(2V/DIV)

V

TIMER

(1V/DIV)

V

OUT

(5V/DIV)

I

OUT

(0.5A/ DIV)

1

VIN = 5V V

GND GND

LONG

SHORT

LONG

R

ON1

20kΩ

R

ON2

10kΩ

C

TIMER

Figure 1.

C

= 470µF

LOAD

10ms/DIV

Figure 2. Start-Up Sequence

OUT

+

R

G

100Ω

R

C

100Ω

C

0.01µF

C
470µF

C

= 5V

LOAD

05132-050

05132-001

The ADM4210 is available in two options: the ADM4210-1 with
automatic retry for overcurrent fault and the ADM4210-2 with

CLR

latch off for an overcurrent fault. Toggling the ON (ON-

)
pin resets a latched fault. The ADM4210 is packaged in a
6-lead TSOT.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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 owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2006 Analog Devices, Inc. All rights reserved.

ADM4210

TABLE OF CONTENTS

Features.............................................................................................. 1

UVLO........................................................................................... 11

Applications....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

Thermal Characteristics .............................................................. 4

ESD Caution.................................................................................. 4

Pin Configurations and Function Descriptions ........................... 5

Typical Performance Characteristics ............................................. 6

Theory of Operation ...................................................................... 11

Overview...................................................................................... 11

REVISION HISTORY

7/06—Revision 0: Initial Version

ON (ON-

GATE ........................................................................................... 11

Current Limit Function............................................................. 11

Calculating the Current Limit.................................................. 11

Circuit Breaker Function........................................................... 12

Timer Function........................................................................... 12

Power-Up Timing Cycle............................................................ 12

Circuit Breaker Timing Cycle................................................... 13

Automatic Retry or Latched Off............................................... 13

Outline Dimensions....................................................................... 14

Ordering Guide .......................................................................... 14

CLR

) Pin..................................................................... 11

Rev. 0 | Page 2 of 16

ADM4210

SPECIFICATIONS

VCC = 2.7 V to 16.5 V, TA = −40°C to +85°C, typical values at TA = 25°C, unless otherwise noted.

Table 1.

Parameter Symbol Min Typ Max Unit Conditions

VCC PIN

Operating Voltage Range VCC 2.7 16.5 V
Supply Current ICC 0.65 3.5 mA
Undervoltage Lockout V
Undervoltage Lockout Hysteresis V

ON (ON-CLR) PIN

Input Current
Threshold VON 1.22 1.3 1.38 V ON rising
Threshold Hysteresis V

SENSE PIN

Input Current
Circuit Breaker Limit Voltage VCB 44 50 56 mV VCB = (VCC− V

GATE PIN

Pull-Up Current I
Pull-Down Current I
V
V
Gate Drive Voltage

4.5 7.5 10 V V

5.0 8.5 12 V V

8.75 12 16 V V

7.6 12 16 V V

6.0 11 18 V V
TIMER PIN

Pull-Up Current I

−25 −60 −100 µA During current fault, V
Pull-Down Current
100 µA Normal operation, V
Threshold High V
Threshold Low V

t

OFF

Turn-Off Time (TIMER Rise to GATE Fall)
Turn-Off Time (ON (ON-CLR) Fall to GATE Fall)
Turn-Off Time (VCC Rise to IC Reset) t

2.2 2.5 2.65 V VCC rising

UVLO

100 mV

UVLOHYS

I

−10 0 +10 µA

INON

80 mV

ONHYST

I

−10 +5 +10 µA V

INSENSE

−5 −10 −15 µA V

GATEUP

25 mA V

GATEDN

V

GATE

−2 −5 −8.5 µA Initial cycle, V

TIMERUP

I

2 3.5 µA After current fault, V

TIMERDN

1.22 1.3 1.38 V TIMER rising

TIMERH

0.15 0.2 0.25 V TIMER falling

TIMERL

t

OFF(TMRHIGH)

t

OFF(ONLOW)

OFF(VCCLOW)

1 µs V

30 µs VON = 5 V to 0 V step, VCC = 5 V

30 µs VCC = 0 V to 2 V step, VON = 5 V

= VCC

SENSE

= 0 V

GATE

= 1.5 V, V

TIMER

= 0 V, V

ON

− V

CC

SENSE

− VCC, VCC = 3 V

GATE

− VCC, VCC = 3.3 V

GATE

− VCC, VCC = 5 V

GATE

− VCC, VCC = 12 V

GATE

− VCC, VCC = 15 V

GATE

= 0 V to 2 V step, VCC = VON = 5 V

TIMER

)

SENSE

= 3 V or

GATE

= 3 V or

GATE

= 100 mV, V

= 1 V

TIMER

TIMER

TIMER

GATE

TIMER

= 1 V
= 1 V

= 3 V

= 1 V

Rev. 0 | Page 3 of 16

ADM4210

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

VCC Pin −0.3 V to +20 V
SENSE Pin −0.3 V to +20 V
VCC − SENSE ±5 V
TIMER Pin −0.3 V to (VCC + 0.3 V)
ON (ON-CLR) Pin
GATE Pin −0.3 V to (VCC + 11 V)
Storage Temperature Range −65°C to +125°C
Operating Temperature Range −40°C to +85°C
Lead Temperature (10 sec) 300°C
Junction Temperature 150°C

−0.3 V to +20 V

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.

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

THERMAL CHARACTERISTICS

θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.

Table 3. Thermal Resistance

Package Type θJA Unit

6-Lead TSOT 169.5 °C/W

Rev. 0 | Page 4 of 16

ADM4210

A

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

ADM4210-1AUJ

TIMER

GND

ON

1

TOP VIEW

2

(Not to Scale)

3

6

5

4

V

CC

SENSE

GATE

Figure 3. Pin Configuration, 1AUJ Model

Table 4. Pin Function Descriptions

Pin No. Mnemonic Description

1 TIMER

Timer Input Pin. The initial and circuit breaker timing cycles are set by this external capacitor. The initial timing
delay is 272.9 ms/F, and 21.7 ms/µF for a circuit breaker delay. When the TIMER pin is pulled beyond the upper

threshold, the GATE turns off.
2 GND Chip Ground Pin.
3

ON (ON-

CLR) Input Pin. The ON (ON-CLR) pin is an input to a comparator that has a low-to-high threshold of 1.3 V with 80 mV

hysteresis and a glitch filter. The ADM4210 is reset when the ON (ON-

high, the ADM4210 is enabled. A rising edge on this pin has the added function of clearing a fault and restarting

the device on the latched off model, the ADM4210-2.
4 GATE

Gate Output Pin. An internal charge pump provides a 12 µA pull-up current to drive the gate of an N-channel

MOSFET. In an overcurrent condition, the ADM4210 controls the external FET to maintain a constant load

current.
5 SENSE

Current Limit Sense Input Pin. The current limit is set via a sense resistor between the V

overcurrent condition, the gate of the FET is controlled to maintain the SENSE voltage at 50 mV. When this limit is

reached, the TIMER circuit breaker mode is activated. The circuit breaker limit can be disabled by connecting the

pin and SENSE pin together.

V

CC

6 VCC

Positive Supply Input Pin. The ADM4210 operates between 2.7 V to 16.5 V. An undervoltage lockout (UVLO)

circuit with a glitch filter resets the ADM4210 when the supply voltage drops below the specified UVLO limit.

DM4210-2AUJ

1

TIMER

GND 2

05132-006

ON-CLR

TOP VIEW

(Not to Scal e)

3

6

V

CC

SENSE5

GATE4

05132-007

Figure 4. Pin Configuration, 2AUJ Model

CLR) pin is low. When the ON (ON-

and SENSE pins. In an

CC

CLR

) pin is

Rev. 0 | Page 5 of 16