LTC4210-3CS6 Linear Technology, LTC4210-3CS6 Datasheet
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LTC4210-3CS6
Specifications of LTC4210-3CS6
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LTC4210-3CS6 Summary of contents
Page 1
... An internal high side switch driver controls the GATE of an external N-channel MOSFET for a supply voltage ranging from 2.7V to 7V. The LTC4210 provides the initial timing cycle and allows the GATE to be ramped adjustable rate. The LTC4210 features a fast current limit loop providing active current limiting together with a circuit breaker timer ...
Page 2
... TIMER After Current Fault Disappears TIMER Under Normal Conditions TIMER High Threshold, TIMER Rising Low Threshold, TIMER Falling ON Threshold, ON Rising ORDER PART NUMBER LTC4210-3CS6 LTC4210-4CS6 LTC4210-3IS6 5 SENSE LTC4210-4IS6 4 GATE S6 PART MARKING LTCPJ = 230°C/ W LTCPM LTCPK LTCPN http://www.linear.com/leadfree/ MIN ...
Page 3
... GATEUP –8 25°C –8 –9.0 CC –9.5 –10 –10.5 –11 –11.5 –12.0 4.5 5.0 150 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V) LTC4210 • G05 UNITS µs µs µs 75 100 125 150 LTC4210 • G03 5.5 6.0 6.5 7.0 LTC4210 • G06 421034fa 3 ...
Page 4
... LTC4210 • G11 I (In Cool-Off Cycle) TIMERDN vs Supply Voltage 3 25°C 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 SUPPLY VOLTAGE (V) LTC4210 • G14 ∆V vs Temperature GATE –50 – ...
Page 5
... Supply Voltage 0. 25°C 0.23 0.22 0.21 0.20 0.19 0.18 0.17 0.16 150 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V) LTC4210 • G18 ON Pin Threshold vs Temperature 1. 1.40 1.35 HIGH THRESHOLD 1.30 1.25 LOW THRESHOLD 1.20 1.15 1.10 1. 7.0 –75 – ...
Page 6
... GND (Pin 2): Ground Pin. ON (Pin 3): ON Input Pin. The ON pin comparator has a low-to-high threshold of 1.3V with 80mV hysteresis and a glitch filter. When the ON pin is low, the LTC4210 is reset. When the ON pin goes high, the GATE turns on after the initial timing cycle. ...
Page 7
... The LTC4210 is designed to turn a printed circuit board’s supply voltage ON and OFF in a controlled manner, allow- ing the circuit board to be safely inserted into or removed from a live backplane ...
Page 8
... The UVLO has a low-to-high threshold of 2.5V, a 100mV hysteresis and a high-to-low glitch filter of 30µs. Above 2.5V supply voltage, the LTC4210 will start if the ON pin conditions are met. A short supply dip below 2.4V for less than 30µs is ignored to allow for bus supply transients. ...
Page 9
... OMITTED FOR CLARITY **USE C IF 0.2µF < C Method 1 P OTHERWISE NOT REQUIRED R Q1 SENSE 0.007Ω Si4410DY SENSE LTC4210* 2.2nF 200Ω 4 GATE R C 100Ω 10nF (2b) 4210 F02 Method 2 Figure 2. Frequency Compensation ≤ C < 9µ OUT C L 421034fa ...
Page 10
... Initial Timing Cycle When the card is being inserted into the bus connector, the long pins mate first which brings up the supply V point 1 of Figure 3. The LTC4210 is in reset mode as the pin is low. GATE is pulled low and the TIMER pin is pulled low with a 100µ ...
Page 11
... During current limiting, the second term in Equation 10 is partly modified from CLOAD t STARTUP current (<10µA). (9) For successful completion of current limit start-up cycle there must be a net current to charge C current limit duration must be less than t second term in Equation 11 has to fulfill Equation 12. LTC4210-3/LTC4210 • GATE I GATE V V ...
Page 12
... The TIMER enters latchoff mode with a 5µA pull-up for the LTC4210-4 (latched-off version), while an autoretry “cool- off” cycle begins with a 2µA pull-down for the LTC4210-3 (autoretry version). An autoretry cool-off delay of the LTC4210-3 between COMP2 and COMP1 thresholds takes: ...
Page 13
... C1, the TIMER pin pulls down with approximately a 7k resistor to ground and a GATE start-up cycle is initiated. If the fault persists, the fault autoretry duty cycle is approximately 3.8%. Pulling the ON pin low for more than 30µs will stop the autoretry function and put the LTC4210 in reset mode ...
Page 14
... Hot Swap controller. Although wire harness, back- plane and PCB trace inductances are usually small, these can create spikes when currents are suddenly drawn, cut- off or limited. The transient associated with the GATE turn should be within the allowed LTC4210 G OUT , θ ...
Page 15
... U APPLICATIO S I FOR ATIO off can be controlled with a snubber and/or transient voltage suppressor. RC snubber networks are effective for LTC4210-3/LTC4210-4 applications. The choice usually determined experimentally. The value of the snubber capacitor is usually chosen between 10 to 100 times the MOSFET C . The value of the snubber resistor OSS is typically between 3Ω ...
Page 16
... 0.1µF D1 1N4148 TIMER ON1 18Ω 20k SHORT 3 LTC4210 ON2 1 10k TIMER C TIMER 0.22µF LONG Z1: SMAJ10A Z2: BZX84C6V2 Figure 11. Supply Side Overvoltage Protection COMMENTS Operates from 3V to 12V and Supports –12V Operates from 2.7V to 12V, Reset Output Operates from –10V to –80V Overvoltage Protection to 33V, Foldback Current Limiting 3.3V, 5V, Internal FETs for ± ...