LTC4210 LINER [Linear Technology], LTC4210 Datasheet
LTC4210
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LTC4210 Summary of contents
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FEATURES Allows Safe Insertion into Live AMC or MicroTCA ■ Backplane Controls 12V Main and 3.3V Auxiliary Supplies ■ Limits Peak Fault Current in ≤1μs ■ ■ Adjustable Current Limit with Circuit Breaker Integrated 0.3Ω AUX Switch ■ High Side ...
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LTC4223-1/LTC4223-2 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltages 12V ..................................................... –0.3V to 20V IN AUXIN .................................................... –0.3V to 10V V ........................................................... –0. Input Voltages 12ON, AUXON, ⎯ E ⎯ N ................................... –0. TIMER ..........................................–0.3V to ...
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ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are T SYMBOL PARAMETER Supplies V Input Supply Range DD I Input Supply Current DD V Input Supply Undervoltage Lockout DD(UVLO) ΔV Input Supply Undervoltage Lockout DD(UVLO, Hysteresis HYST) Current Limit ΔV Circuit ...
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LTC4223-1/LTC4223-2 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are T SYMBOL PARAMETER I TIMER Pull-Up Current TMR(UP) I TIMER Pull-Down Current TMR(DN) Open Drain Outputs Output Low Voltage ( ⎯ F ⎯ A ⎯ U ⎯ L ⎯ ...
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TYPICAL PERFORMANCE CHARACTERISTICS 3.3V, V =12V, unless otherwise specifi ed. 12VIN 1.6 1.2 0.8 0.4 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 V (V) CC 422312 G01 12IMON Output Voltage vs Sense Voltage 4 ...
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LTC4223-1/LTC4223-2 TYPICAL PERFORMANCE CHARACTERISTICS 3.3V, V =12V, unless otherwise specifi ed. 12VIN AUX Switch On Resistance vs Temperature 0.5 0.4 0.3 0.2 0.1 –50 – TEMPERATURE (°C) 422312 G10 Gate Pull-Up Current vs Temperature –11.0 –10.5 ...
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PIN FUNCTIONS 12V (Pin 1): 12V Current Sense Input. Connect this SENSE pin to the output of the current sense resistor. The electronic circuit breaker trips if the voltage across the sense resistor exceeds 50mV for more than a fault ...
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LTC4223-1/LTC4223-2 FUNCTIONAL DIAGRAM 12V IN 12V SENSE 12ON 200μA 10μA TIMER 2μA AUXON GND AUXIN – R OUT 165k 10μA CHARGE PUMP 60mV ACL ...
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OPERATION The LTC4223 is designed to control the power on an Ad- vanced Mezzanine Card (AMC) or MicroTCA backplane, allowing boards to be safely inserted and removed. It controls the 12V main and 3.3V auxiliary power through an external N-channel ...
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LTC4223-1/LTC4223-2 APPLICATIONS INFORMATION 3.3V MP ENABLE PWR ENABLE MP GOOD PWR GOOD FAULT INTELLIGENT PLATFORM MANAGEMENT CONTROLLER 3 3.3V 2.2k PRESENCE RESET Figure 1. Advanced Mezzanine Card/MicroTCA Application The typical LTC4223 application Carrier board for Advanced Mezzanine ...
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APPLICATIONS INFORMATION Several conditions must be met before the external and internal switches are allowed to turn on. First V the input supplies (12V , AUXIN) must exceed their IN undervoltage lockout thresholds. Next TIMER must be <0.2V and ⎯ ...
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LTC4223-1/LTC4223-2 APPLICATIONS INFORMATION Turn-Off Sequence The switches can be turned off by various conditions and this is summarized in Table 1. When the 12ON pin goes low, the external switch is turned off with the GATE pin pulled to ground ...
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APPLICATIONS INFORMATION As the TIMER capacitor is used for fault fi ltering during power-up for both the auxiliary and 12V supplies, only one supply can be started up at any one time. The other supply waits until the power-good signal ...
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LTC4223-1/LTC4223-2 APPLICATIONS INFORMATION There are two different modes of fault time-out for the 3.3V auxiliary supply: adjustable delay through TIMER capacitor during power-up when ⎯ A ⎯ U ⎯ X ⎯ P ⎯ G ⎯ O ⎯ O ⎯ D ...
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APPLICATIONS INFORMATION Power-Good Monitor Internal circuitry monitors the output voltages, AUXOUT and 12V . The power-good status is reported via their OUT respective open drain outputs, ⎯ A ⎯ U ⎯ X ⎯ P ⎯ G ⎯ O ⎯ O ...
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LTC4223-1/LTC4223-2 APPLICATIONS INFORMATION GATE Pin Voltage The gate drive at 12V is compatible with any logic GATE level MOSFET. The guaranteed range of gate drive is 4.5V to 7.9V, with a typical of 6.2V. Active Current Loop Compensation The compensation ...
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APPLICATIONS INFORMATION FAULT PULLS LOW DUE TO 12V OVERCURRENT FAULT START OF COOL-OFF CYCLE 1 FAULT V TMR 200μA 2μA TIMER COOL-OFF CYCLE 12V GATE 60mV 12V - 12V IN SENSE 12V OUT Supply Transient Protection The supply inputs, AUXIN ...
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LTC4223-1/LTC4223-2 APPLICATIONS INFORMATION R2 51Ω AUXIN C2 330nF Figure 11. RC Network for V PCB Layout Considerations For proper operation of the LTC4223’s circuit breaker, Kelvin-connection to the sense resistor is strongly rec- ommended. The PCB layout should be balanced ...
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APPLICATIONS INFORMATION Δ V SENSE CB MIN ( )( ) = = I TRIP MIN ( ) R SENSE MAX ( ) Δ V SENSE CB MAX ( )( ) = = I TRIP MAX ( ) ...
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LTC4223-1/LTC4223-2 TYPICAL APPLICATION BACKPLANE CARD CONNECTOR CONNECTOR 12V Z1 SMAJ13A 10k SMAJ7.0A PWRFLT PWREN BD_SEL GND 20 Card Resident Application with 5V Auxiliary Supply 4mΩ Si7336ADP R1 10Ω 10Ω 100nF 12V 12V ...
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TYPICAL APPLICATION Card Resident Application with 12V Power Up First Followed by 3.3V Auxiliary BACKPLANE CARD CONNECTOR CONNECTOR 12V Z1 SMAJ13A 3.3V Z2 SMAJ5.0A PWREN R8 10k 3.3V 2N7002K R6 10k PWRFLT BD_SEL GND 4mΩ Si7336ADP R1 ...
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LTC4223-1/LTC4223-2 PACKAGE DESCRIPTION .254 MIN .0165 ± .0015 RECOMMENDED SOLDER PAD LAYOUT .007 – .0098 (0.178 – 0.249) .016 – .050 (0.406 – 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE ...
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PACKAGE DESCRIPTION 4.50 ±0.05 3.10 ±0.05 2.44 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF NOTE: 1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJGD-2) IN JEDEC PACKAGE OUTLINE ...
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