MIC2596A-2TSE - Micrel, Inc.

December 2000 1 MIC2596A/2697A

MIC2596A/2697A Micrel

MIC2596A/2697A

Dual Channel Negative Voltage Hot Swap Controllers

Advance Information

General Description

The MIC2596A and MIC2597A are dual channel negative

voltage hot swap controllers designed to facilitate safe PC

board insertion into and removal from live backplanes. To

minimize external components, each channel of the

MIC2596A/MIC2597A has an integrated high voltage power

MOSFET. Built-in current sensing in each channel provides

inrush current limiting, by regulating the channel’s output

current to a user-settable maximum. Current sensing also

provides programmable overcurrent and open-load detec-

tion. A channel will be turned off if it experiences overload or

no-load conditions lasting longer than programmable inter-

vals. Foldback current limiting holds power dissipation of the

internal MOSFETs at safe levels during overloads, and very

fast shutdown response to faults ensures protection for both

system power supplies and the load. The MIC2596A will

automatically attempt to restart into an overcurrent fault until

the fault is cleared, while the MIC2597A will latch the output

in the off state until it is reset by external action. A logic-

compatible signal is provided on each channel to indicate

overcurrent or undercurrent fault conditions.

Typical Application

OUT1

+3.3V

–48V

ILIMIT

CGATE1

OUT2

CGATE2

ILIMIT2

COL2

GND

VEE

COL1

CTIMER2

CTIMER1

CONTROLLER

VDDL

ON2

ON1

FAULT#2

FAULT#1

VCLAMP V

OUT1

OUT2

VDDA

MIC2596A

167

ON/OFF_CH2

ON/OFF_CH1

FAULT#_CH2

FAULT#_CH1

System-Controlled Hot Swap

Features

•Allows safe hot-swap in –48V systems

•Operates to –70V

•Programmable inrush current limiting

•Two thermally isolated channels

•Overcurrent fault sensing and protection

•Nuisance trip prevention circuitry

•Open-load detection

•Logic compatible Enable and Fault signals

•Separate analog and logic ground pins support large

system ground differentials (±8V)

Applications

•Central Office Switching

•–48V Power Distribution

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

MIC2596A/2697A Micrel

MIC2596A/2697A 2 December 2000

Ordering Information

Part Number ON Signal Circuit Breaker Function Package

MIC2596A-1BTS Active-High Auto-Retry 20 pin TSSOP

MIC2596A-2BTS Active-Low Auto-Retry 20 pin TSSOP

MIC2597A-1BTS Active-High Latched Off 20 pin TSSOP

MIC2597A-2BTS Active-Low Latched Off 20 pin TSSOP

MIC2596A-1TSE Active-High Auto-Retry 20 pin Exposed Pad

MIC2596A-2TSE Active-Low Auto-Retry 20 pin Exposed Pad

MIC2597A-1TSE Active-High Latched Off 20 pin Exposed Pad

MIC2597A-2TSE Active-Low Latched Off 20 pin Exposed Pad

December 2000 3 MIC2596A/2697A

MIC2596A/2697A Micrel

Pin Configuration

1ON1

ILIMIT1

CTIMER1

COL1

VCLAMP

VDD/VDDA*

COL2

CTIMER2

ILIMIT2

ON2

20 FAULT#1

OUT1

N/C

CGATE1

VEE

VDDL*

CGATE2

N/C

OUT2

FAULT#2

20-Pin TSSOP

Pin Descriptions

Pin Number Pin Name Pin Function

20, 11 FAULT1#/FAULT2# Fault Status Output, Active-low - Asserted when the circuit breaker trips

upon overcurrent, open-load or thermal shutdown conditions.

1, 10 ON1/ON2 Enable Input - Active-high (MIC259xA-1) or active-low (MIC259xA-2). When

asserted ON will initiate a start cycle by activating the GATE output. Tog-

gling ONx will also reset the circuit breaker in the MIC2597A.

3, 8 CTIMER1/CTIMER2 Current Limit Response Timer. A capacitor connected to this pin defines the

period of time tFLT in which an overcurrent event must last to signal a fault

condition and turn the output off.

16 VEE Negative Supply Voltage Input.

2, 9 ILIMIT1/ILIMIT2 Current Limit Set. The current limit threshold is set by connecting a resistor

between this pin and VEE. When the current limit threshold of a channel is

exceeded for tFLT the circuit breaker for that channel is tripped and its

respective output is immediately shut off.

19, 12 OUT1/OUT2 Switch Outputs. Connect to load.

6 VDDA Positive Supply Input. Normally connected as the power ground reference in

negative supply (–48V) systems. VDDA is the IC’s “analog ground,” used for

internal biasing relative to –VEE.

5 VCLAMP FAULT# Clamp Voltage. A small bias current into this pin (usually supplied

by the controlling logic’s supply voltage) powers internal circuitry which

establishes the active low voltage of the FAULT# signals. In normal circuit

configurations, the low-level output voltage will be clamped to VDDL.

4, 7 COL1/COL2 Open-Load Detect Timer - When the load current falls below 8% of full scale

current limit the capacitor connected to COL1/COL2 begins to change. When

the voltage across COL1/COL2 rises above 1.32V the output is immediately

shut off. When ONx is deasserted or when the load current is above 15% of

full scale current limit then this pin is held to VEE. Tying this pin to VEE will

disable this function.

17,14 CGATE1/CGATE2 Noise filtering capacitors for the gates of the main output MOSFETs.

Typically in the range of 1000pF ~ 4700pF.

15 VDDL VDDL provides the ground reference for the logic-compatible FAULT# and

ON signals, while accommodating ±8 volts of ground differential between the

controlling logic and the power ground (VDDA) of the MIC2596A/2597A. If no

differential voltage capability is required between VDDA and VDDL, these two

pins should be tied together at the part.

13, 18 N/C No Connect.

MIC2596A/2697A Micrel

MIC2596A/2697A 4 December 2000

Absolute Maximum Ratings

(All voltages are referred to VEE) (Note 1)

Supply Voltage (VDDA to VEE)........................ –0.3V to 80V

VCLAMP pin (Note 2) ...................................... –0.3V to 5.5V

ON, FAULT# pins (Note 2)............................ –0.3V to 5.5V

Junction Temperature .............................. Internally Limited

ESD (Human Body Model)........................................... [tbd]

ESD (Machine Model) .................................................. [tbd]

Operating Ratings

Supply Voltage (VDDA to VEE)........................... 15V to 70V

Supply Voltage (VDDL to VEE) ........................... 15V to 70V

VCLAMP (relative to VDDL).............................. 2.5V to 5.25V

Ambient Temperature ................................ –40°C to +85°C

TSSOP Package: .......................................... θJA = 90°C/W

TSE Exposed Pad Package (Note 3)............ θJA = 38°C/W

Continuous Junction Temperature ........... 125°C Maximum

Electrical Characteristics

VDDA = VDDL = 40V, VEE = 0V, VCLAMP = VDD + 3.3V, RLIMIT1 = RLIMIT2 = 20k , TA = 25°C unless otherwise noted.

Symbol Parameter Condition Min Typ Max Units

IDD Supply Current VDDA = VDDL = 70V, Both outputs on or off 3.3 5.0 mA

–40°C to 85°C

UVLO Undervoltage Lockout threshold VIN rising 11.5 12.5 V

Undervoltage Lockout hysteresis VIN falling –0.35 V

ICLAMP CLAMP pin supply current FAULT#1 and FAULT#2 are high 190 µA

VCLAMP = 5.25V

VOL FAULT#[1/2] output low voltage IOL = 250µA–0.3 –0.18 0.4 V

(Note 2)

RDSON On-Resistance (Each Switch) TJ = 25°C 1.5 2.0 Ω

On-Resistance (Each Switch) TJ = 85°C 1.9 2.5 Ω

CLF Current Limit Factor (Notes 4, 6) RLIMIT1 = RLIMIT2 = 40k 1700 2000 2300 A•Ω

IOFF Off-state Output leakage current Switch is off, TJ = 25°C2µA

VOUT = VDDA = VDDL = 70V

Off-state Output leakage current Switch is off, TJ = 85°C5µA

VOUT = VDDA = VDDL = 70V

ITIMER Overcurrent Timer pull-down current 1.1 1.9 2.7 µA

Overcurrent Timer charge current –42 –72 –103 µA

IOLDTH Open Load Detect threshold IOUT decreasing 6 9 12 %

(percent of full-scale output current) IOUT increasing 8 12 16 %

(Notes 5, 6)

IOLDHYS Open Load Detect hysteresis 3 %

(percent of full-scale output current)

VTHHI Overload Timer Capacitor 1.12 1.32 1.52 V

high-going threshold voltage

VTHLO Overload Timer low -going threshold 0.21 0.24 0.27 V

voltage for auto-restart (MIC2596A)

(Note 6)

IGATE CGATE Capacitor charge current During turn-on –79 µA

VCOL Open Load Detect Timer high-going 1.12 1.32 1.52 V

threshold voltage

ICOL Open-Load Detect Timer capacitor –10 –17 –24 µA

charge current

VFBU Output voltage foldback threshold Upper threshold 25 31 37 V

VFBL Lower threshold 10 13 16 V

IFOLDBACK Foldback output current limit VOUT – VEE > VFBU, % of full scale 12 20 28 %

current limit

December 2000 5 MIC2596A/2697A

MIC2596A/2697A Micrel

Symbol Parameter Condition Min Typ Max Units

VIL ON Pin Low threshold Voltage –40°C to 85°C 0.8 V

IIL ON Pin input current VON = VCLAMP 150 µA

VIH ON Pin High threshold voltage –40°C to 85°C 2.0 V

TPROTECT Thermal self-protection points TJ increasing (turn-off) 145 °C

TJ decreasing (turn-on) 135 °C

AC Parameters

tON Turn-on time CL = 1µF, RL = 1kΩ, CGATE = 1nF [tbd] ms

tOFF Turn-off time CL = 1µF, RL = 1kΩ, CGATE = 1nF [tbd] ms

tRRise-time CL = 1µF, RL = 1kΩ, CGATE = 1nF [tbd] ms

tFFall-time CL = 1µF, RL = 1kΩ, CGATE = 1nF [tbd] ms

tOC Current limit response time CGATE ≤ 1nF 4 µs

tOFF(UVLO) Undervoltage to OUT1/OUT2 off CL = 1µF, RL = 1kΩ, CGATE = 1nF [tbd] µs

response time

Notes:

Note 1: Absolute Maximum Ratings are those ratings beyond which a part may be permanently damaged. Functionality is not guaranteed when a part

is operated at its Absolute Maximum Ratings.

Note 2: Relative to VDDL.

Note 3: The exposed pad of the TSE package must be connected to VEE of the part, or be electrically isolated.

Note 4: The current limit threshold is defined by the current limit factor divided by RLIMIT, the resistor connected to the ILIMIT1/ILIMIT2 pins.

Note 5: Open Load Detect is not guaranteed to function for programmed maximum output currents <[tbd]mA

Note 6: Final production value TBD.

Timing Diagrams

Device Under

Test

OUT

OUT t

90%

10%

90%

10%

OUT

tON

MIC2596A-2

MIC2597A-2

10%

90%

50%

tOFF

tON

MIC2596A-1

MIC2597A-1

10%

90%

50%

tOFF

ON/OFF

VOUT

ON/OFF

VOUT

MIC2596A/2697A Micrel

MIC2596A/2697A 6 December 2000

Functional Description

Hot Swap Insertion

When circuit boards are inserted into systems with live power

supplies, high inrush currents can result due to the charging

of bulk capacitance that resides across the circuit board’s

supply pins. This inrush current, although transient in nature,

can be of significant amplitude. Such current spikes can

cause supply voltages to go out of regulation, resulting in

system crashes. Additionally, the high rates of di/dt may do

permanent damage to electronic components and/or assem-

blies.

The MIC2596A family of parts is designed to address these

issues by limiting the inrush current which a PC board or other

load can draw during a hot-swap event. In addition to this

inrush current control, the MIC2596A/MIC2597A provide

output current limiting and supervisory functions to ensure

robust protection for both the host system and the circuit

board.

VDDA and VDDL

In some systems, considerable ground differentials can oc-

cur between the physical plant monitor and the actual power

control circuitry. An example of this would be in a system

spanning several racks of equipment, with a centralized CPU

watching over the hot-swap functions. In order to alleviate the

need for optical isolators or similar devices when hot-swap

parts are used in such a system, the MIC2596A/MIC2597A

have separate grounds for their on-chip power-related func-

tions and their digital interface pins (ON1, ON2, FAULT1#,

FAULT2#). The unique architecture of these parts allows

voltage differentials of ±8 volts to exist between VDDA (the

Functional Diagram

VDDL

CONTROLLER

GROUND VDDA

MIC2696A

MIC2597A

SYSTEM

CONTROLLER

VOUT1

VOUT2ON1/ON2

VCLAMP

Rpullup1

Rpullup2

FAULT#1/FAULT#2

Control Signals

3.3V or 5V Supply

Status Signals

VEE

Figure 1. Use of VDDA and VDDL to Mitigate Ground Noise Effects

“analog” ground) and VDDL (the “logic” ground), without

disturbing device performance.

In distributed systems, VDDA should be connected to the local

return of the power which the MIC2596A/MIC2597A is con-

trolling, while VDDL should be separately connected to the

monitor and control logic’s ground. See Figure 1. If the

capability to tolerate voltage differentials between VDDA and

VDDL is not required, the two grounds should be tied together

at the chip.

Start-Up Cycle

Referring to the Typical Applications Circuit, when a channel’s

ON pin is asserted the respective MIC2596A/MIC2597A

output is enabled. To minimize inrush current transients the

output current is regulated to ensure that it does not exceed

the value programmed by the resistor R1(R2) connected to

the ILIMIT pin.

Circuit Breaker Function

The MIC2596A and MIC2597A act as electronic circuit break-

ers to protect loads, connectors, power supplies, and other

system components against faults such as short circuits. The

circuit breaker function trips upon overcurrent, open-load or

thermal shutdown conditions. The FAULT# output is as-

serted (taken low) when the circuit breaker is tripped. The

timer capacitor C2 (C3) is normally pulled low by a small

current source. However, whenever the current limit thresh-

old is exceeded C2 is charged by a much stronger current

source. If an overcurrent condition exists for a long enough

time to allow the voltage at the CTIMER pin to cross the

December 2000 7 MIC2596A/2697A

MIC2596A/2697A Micrel

threshold VTHHI , the circuit beaker is tripped and the output

is immediately turned off. This time-out period tFLT prevents

the circuit breaker from erroneously tripping due to inrush

currents during start-up or other transient currents caused by

normal system operation.

The MIC2596A circuit breaker has an automatic-reset func-

tion. After the circuit breaker trips a new start-up cycle is

initiated. If the fault still exists C2 (C3) will again charge up

to VTHHI and trip the circuit breaker. C2 will then be dis-

charged, and when the voltage across C2 goes below VTHLO

another start cycle is initiated. This will continue until the fault

is removed or the channel is turned off. In the MIC2597A the

circuit breaker is only reset by either toggling the ON pin or

cycling input power. The MIC2597A will be enabled to start up

only if the voltage across CTIMER is below VTHLO.

Foldback Current Limiting

During short circuits or excessive loads the MIC2596A and

MIC2597A employ foldback current limiting. When the

differential from VEE to VOUT reaches -13V, the output

current starts to fold back. When (VEE – VOUT) reaches –31V,

the output current will be limited to approximately 20% of its

full scale value. Figure 2 illustrates the foldback function.

100%

20%

13V 31V

OUT

(%of I

LIM

)

OUT

– V

Figure 2. Foldback Characteristics

Fault Status Indication

The MIC2596A and MIC2597A will assert the FAULT# output

whenever their circuit breaker function is activated by an

overcurrent condition. A fault will also be indicated if an open-

load or thermal shutdown condition is detected. Figure 3

shows FAULT# timing scenarios.

t > tFLTOL

t > tFLT

t < tFLT

ILIMIT

ILOAD

IOLDTH

FAULT#

(MIC2597A-1)

Figure 3. MIC2597A Fault Timing

MIC2596A/2697A Micrel

MIC2596A/2697A 8 December 2000

Application Information

Thermal Shutdown and Power Dissipation

Thermal shutdown protection is employed to protect the

internal power MOSFETs from damage. Whenever the junc-

tion temperature TJ of the channel in current limit exceeds

145°C the output is immediately shut off without affecting the

other channel. A channel will automatically turn on again

when its TJ falls below 135°C. The junction temperature is

related to the internal power dissipation of the MIC2596A

(MIC2597A). The equation for junction temperature is:

TJ = [(θJA · PD) + TA] where:

TJ is the junction temperature,

PD is the total power dissipation of the part, and

TA is the ambient temperature.

PD is determined by adding the power dissipated by each

MOSFET to the power dissipated by the internal circuitry

(PCHIP). The equation for PD is thus:

PD = PCHIP + PFET1 + PFET2

= (VEE x IEE) + [(I12) x RDS(ON)1] + [(I22) x RDS(ON)2]

where I1 and I2 are the continuous output currents of chan-

nels 1 and 2.

For example, to compute the maximum continuous output

current per channel of the TSSOP package at VEE = –48V, TA

= 70°C, and TJ(CONTINUOUS) = 125°C:

Rθ(J-A) = 90°C/W

PD(MAX) = (125°C - 70°C)/(90°C/W) = 0.611W

0.611W = (–48V x –5mA) + (2 x IMAX2 x 2.5Ω)

0.371W = 2 x 2.5Ω x IMAX2

0.371W/(2 x 2.5Ω) = IMAX2 = 0.0742 A2

IMAX = 272mA per channel

Similarly, for the TSE package, at TA = 85°C and

TJ(CONTINUOUS) = 125°C:

Rθ(J-A) = 38°C/W

PD(MAX) = (125°C - 85°C)/(38°C/W) = 1.05W

1.05 W = (–48V x –5mA) + (2 x IMAX2 x 2.5Ω)

0.81W = 2 x 2.5Ω x IMAX2

0.81W/(2 x 2.5Ω) = IMAX2 = 0.162 A2

IMAX = 402mA per channel

Note that in each case the assumption has been made that

the load currents will be the same on both channels.

External Components

A small number of passive components are used for each

channel of the MIC2596A/MIC2597A to program such values

as maximum DC output current and the short circuit “trip”

interval. Calculating values for these parts is a straightfor-

ward exercise, once the nomenclature for and effect of each

such part is understood. This section addresses each

programmable pin by showing a sample calculation for that

pin.

RLIMIT

A resistor from ILIMIT to VEE sets the maximum DC operating

current of the channel. The formula for calculating this

resistance is RLIMIT(NOMINAL) = (1A·2000Ω)/ILIMIT. As an

example, if the maximum DC current from one channel of an

MIC2596A was to be 0.15A, the nominal value of RLIMIT for

that channel would be (1A· 2000Ω)/0.15A = 13.3kΩ. It is

usually necessary, however, to allow for device tolerances:

using a 13.3kΩ resistor and the minimum Data Sheet value

Current Limit Factor of (1A·1700Ω)/RLIMIT could restrict the

part to delivering only 127mA. Therefore, it is necessary to

use RLIMIT = (1A·1700Ω)/ILIMIT to find RLIMIT’s minimum

value: 1700/0.15A = 11.3kΩ. This revised value should then

be tested against the other extreme of the IC’s Data Sheet

tolerance. 11.3kΩ could program a steady-state DC current

as high as (1A·2300Ω)/11.3kΩ = 203mA maximum. The

system must be designed to accommodate this maximum

current, or RLIMIT can be made adjustable over the range

necessary to maintain a precise 150mA DC current limit

(11.3kΩ - 15.3kΩ). In order to minimize error budget issues,

the use of a 1% tolerance resistor for RLIMIT is generally

recommended.

CTIMER

A capacitor from CTIMER to VEE sets the length of time for

which an overcurrent fault is allowed to exist on a channel

before the channel goes into shutdown. CTIMER is normally

pulled down to VEE by a small current (1.9µA nominal).

During an overcurrent condition, the pulldown current is

replaced by a charging current of 72µA nominal. The output

will be disabled once the voltage on CTIMER becomes 1.32V

greater than VEE. Given these numbers, it’s easy to program

the time an MIC2597A will tolerate an output overload before

“tripping” and shutting its output off, using the formula CTIMER

= (72µA·TOL/1.32V). For example, if it’s desired to allow

50msec for the load capacitance to charge up before the

MIC2597A declares a “fault,” then CTIMER = (72µA·50msec/

1.32V) = 2.7µF.

For the MIC2596A, there is a slight modification to the above

formula, due to the MIC2596A’s auto-retry feature. When an

overcurrent condition occurs, CTIMER will (as with the

MIC2597A) charge at a 72µA rate towards 1.32V. Once that

threshold is reached, the output will be turned off. However,

instead of being latched off as with the MIC2597A, it will turn

on again when the voltage across CTIMER is discharged back

to 0.24V by the 1.9µA internal pulldown. The first fault

timeout period following power-on will therefore be TOL =

(CTIMER·1.32V/72µA), but the following retry intervals will be

of duration TOL = [CTIMER·(1.3V-0.24V)/72µA] =

(CTIMER·1.06V/72µA). Rearranging, we get: CTIMER =

(72µA·TOL /1.06V). Again using 50msec as an example for

the desired fault timeout, this gives CTIMER =

(72µA·50msec/1.06V) = 3.4µF. In this case, 3.3µF would be

a good choice for CTIMER. The maximum voltage to which

CTIMER will charge is less than 2V, so a 4.7V voltage rating on

the capacitor provides ample safety margin.

Note that, for the MIC2596A, the ratio of CTIMER charge and

discharge currents are always 38:1. This means that in an

overload fault condition, the part will attempt to restart the

load with a duty cycle of approximately 2.5%, which is low

December 2000 9 MIC2596A/2697A

MIC2596A/2697A Micrel

enough to protect the IC and the system, yet high enough to

prevent undue restart delays.

COL

One of the special functions of the MIC2596A family of parts

is the ability to detect not only overload faults, but also

undercurrent (open-load) faults. The time for which a channel’s

output must see a load below a minimum current level (which

is a preset percentage of ILIMIT - see the Data Sheet Electrical

Tables) is set by COL. When an undercurrent condition is

detected, COL is charged from 0V relative to VEE towards a

threshold voltage of 1.32V above VEE by a current of 17µA

(nominal). This gives the formula COL = (17µA·TOL/1.32V).

For example, if a no-load detection period of 75msec is

desired, COL is found to be 0.97µF. 1µF is the closest

standard value. Once the output current goes above the

minimum load current, COL is discharged to VEE. The

maximum voltage to which COL will charge is less than 2V, so

a 4.7V voltage rating on the capacitor provides ample safety

margin.

It is important to note that neither the MIC2596A nor the

MIC2597A will attempt an “auto-retry” upon detecting an

open-load condition. If either of these parts shuts one or both

of its output off following such a condition, the affected

output(s) can only be turned on again by turning the channel(s)

off and then back on, or by cycling the power to the IC. If the

open load detection capability is not needed for a given

channel, it can be defeated by tying the COL pin for that

channel to VEE.

CGATE

This pin is a direct connection to the gate of each channel’s

internal power MOSFET. Typically, it is used to connect a

capacitor in the range of 1000pF to 4700pF between the

MOSFET gate and VEE, to augment the noise immunity of the

channel. This especially helps with regard to dv/dt appearing

on the channel’s output, which could otherwise couple through

the drain-gate capacitance to the MOSFET’s input.

As the internal MOSFET is an N-channel device in the

negative leg of the channel’s power path, the negative

terminal of CGATE should connect to VEE, and its positive

terminal to the IC’s CGATE pin. A voltage rating of 15V is well

suited to the approximately 10V which will appear on CGATE

when the internal MOSFET is fully enhanced.

OUT1

VIN

–48V

ILIMIT

CGATE1

OUT2

CGATE2

ILIMIT2

COL2 VEE

COL1 C4

CTIMER2

CTIMER1

VDDL

ON2

ON1

FAULT#2

FAULT#1

VCLAMP VOUT1

VOUT2

VDDA

MIC2596A-2

167

N/C

Stand Alone Hot Swap Application

MIC2596A/2697A Micrel

MIC2596A/2697A 10 December 2000

Package Information

2.00 (0.079)

1.73 (0.068)

0.21 (0.008)

0.05 (0.002)

COPLANARITY:

0.10 (0.004) MAX

1.25 (0.049) REF

0.65 (0.0260)

BSC

0.875 (0.034)

REF

10°

4°

0°

–8°

5.40 (0.213)

5.20 (0.205)

7.90 (0.311)

7.65 (0.301)

7.33 (0.289)

7.07 (0.278)

0.38 (0.015)

0.25 (0.010)

0.22 (0.009)

0.13 (0.005)

0.95 (0.037)

0.55 (0.022)

DIMENSIONS:

MM (INCH)

20-Pin SOP (TS)

2.00 (0.079)

1.73 (0.068)

0.21 (0.008)

0.05 (0.002)

COPLANARITY:

0.10 (0.004) MAX

1.25 (0.049) REF

Exposed Pad

Bottom View

0.65 (0.0260)

BSC

0.875 (0.034)

REF

10°

4°

0°

–8°

5.40 (0.213)

5.20 (0.205)

7.90 (0.311)

7.65 (0.301)

7.33 (0.289)

7.07 (0.278)

0.38 (0.015)

0.25 (0.010)

0.22 (0.009)

0.13 (0.005)

0.95 (0.037)

0.55 (0.022)

DIMENSIONS:

MM (INCH)

20-Pin Exposed Pad SOP (TS)

MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.