LTC4222IG#PBF Linear Technology, LTC4222IG#PBF Datasheet
LTC4222IG#PBF
Specifications of LTC4222IG#PBF
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LTC4222IG#PBF Summary of contents
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... I to turn on. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7330065. 10.2k 10Ω ...
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... EXPOSED PAD (PIN 33), PCB GND CONNECTION OPTIONAL ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC4222CG#PBF LTC4222CG#TRPBF LTC4222IG#PBF LTC4222IG#TRPBF LTC4222CUH#PBF LTC4222CUH#TRPBF LTC4222IUH#PBF LTC4222IUH#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. ...
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ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Supplies V Input Supply Range DDn I V Input Supply Current DD1 DD1 I V Input Supply Current DD2 DD2 V Input Supply Undervoltage Lockout DDn(UVL) V Input ...
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LTC4222 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Other Pin Functions V GPIO Output Low Voltage GPIO(OL) I GPIO Input Leakage Current GPIO(OH) I SOURCE Input Current SOURCE Input (ON, OV, UV, EN) to GATE ...
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ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Interface V ADR0, ADR1, ADR2 Input High Voltage ADR(H) I ADR0, ADR1, ADR2 Hi-Z Input Current ADR(IN,Z) V ADR0, ADR1, ADR2 Input Low Voltage ADR(L) ...
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LTC4222 TYPICAL PERFORMANCE CHARACTERISTICS DD1 DD1 1.0 0.9 0.8 0.7 0.6 0.5 0 (V) DD1 4222 G01 INTV LOAD 3.50 3.25 3.00 2.75 2.50 0 2.5 5.0 ...
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TYPICAL PERFORMANCE CHARACTERISTICS Current Limit 0.2 0.4 0.6 0.8 1.0 1.2 V (V) FB 4222 G08 Δ GATE GATE 6.5 6.0 5.5 5.0 4.5 4 ...
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LTC4222 TYPICAL PERFORMANCE CHARACTERISTICS ADC INL vs CODE (ADIN1) 0.5 0.4 0.3 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 –0.5 0 256 512 CODE ADC Full-Scale Error vs Temperature –1 –2 –3 –4 –50 –25 ...
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PIN FUNCTIONS ADIN: ADC Input. A voltage between 0 and 1.28V applied to this pin is measured by the on-board ADC. Tie to ground if unused. ADR0, ADR1, ADR2: Serial Bus Address Inputs. Tying these pins to ground, open, or ...
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LTC4222 PIN FUNCTIONS SCL: Serial Bus Clock Input. Data at the SDA pin is shifted in or out on rising edges of SCL. This is a high impedance pin that is generally driven by an open-collector output from a master ...
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FUNCTIONAL DIAGRAM FB + 1.235V UV – + 0.4V RESET RST – INTV CC – 1.235V + 1.235V – 2.43V + UVLO1 V DD – SS SOFT-START CONFIG + COUPLE – 1.235V SDAI ...
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LTC4222 TIMING DIAGRAM SDAI/SDAO SCL t HD, STA START CONDITION OPERATION The LTC4222 is designed to turn two supply voltages on and off in a controlled manner, allowing boards to be safely inserted or removed from a live backplane. During ...
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OPERATION When the CONFIG pin is high the two channels work completely independently and ignore the behavior of the other channel. This allows for the channels to start up in sequence by connecting the GPIO (power good) output of one ...
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LTC4222 APPLICATIONS INFORMATION V IN1 12V ON SDA SCL ALERT GND V IN2 3.3V BACKPLANE PLUG-IN CARD A MOSFET is turned on by charging up the GATE with a 12μA current source. When the GATE voltage reaches the MOSFET threshold ...
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APPLICATIONS INFORMATION SENSE t STARTUP 25mV 10mV SS FB LIMITED LIMITED Figure 2. Power-Up Waveform the output, a 12μA pull-up current (I pin slews the gate upwards and resulting current is less than ...
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LTC4222 APPLICATIONS INFORMATION fault is declared for that supply and the MOSFET is turned off. If the CONFIG pin is low, then both channels will turn off together. After the switch has turned off due fault the ...
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APPLICATIONS INFORMATION Setting the CONFIG pin high allows the two channels to start up and turn off independently. When both ON signals are brought high sequentially, the channel turned on fi rst immediately begins to start up and the second ...
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LTC4222 APPLICATIONS INFORMATION Fault Alerts When any of the fault bits in a FAULT register (see Table 4) are set, an optional bus alert is generated if the appropri- ate bit in the ALERT register has been set. This allows ...
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APPLICATIONS INFORMATION Confi guring the GPIO Pins Table 3 describes the possible states of the GPIO pins using the CONTROL registers bits 6 and 7. At power-up, the default state is for a GPIO pin to go high impedance when ...
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LTC4222 APPLICATIONS INFORMATION Selection of the sense resistor set by the overcurrent S threshold of 50mV Ω MAX The MOSFET is sized to handle the power dissipation ...
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APPLICATIONS INFORMATION The address is set with the help of Table 1, which indi- cates binary address 1000111 corresponds to address 4. Address 4 is set by setting ADR2 low, ADR1 open and ADR0 high. Next the value of R5 ...
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LTC4222 APPLICATIONS INFORMATION SDA SCL START ADDRESS CONDITION alert, it acknowledges this address by broadcasting its address and releasing the ALERT pin. Acknowledge The acknowledge signal is used in handshaking between transmitter and ...
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APPLICATIONS INFORMATION same seven bit address with the R/W bit now set to one. The LTC4222 acknowledges and send the contents of the requested register. The transmission is ended when the master sends a STOP condition. If the master acknowledges ...
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LTC4222 APPLICATIONS INFORMATION 2 Table 1. LTC4222 I C Device Addressing DEVICE DESCRIPTION ADDRESS h 7 Mass Write C6 1 Alert Response ...
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APPLICATIONS INFORMATION Table 2. LTC4222 Register Addresses and Contents REGISTER ADDRESS Decimal Hex 208 D0h 209 D1h 210 D2h 211 D3h 212 D4h 213 D5h 214 D6h 215 D7h 216 D8h 217 D9h 218 DAh 219 DBh 220 DCh 221 ...
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LTC4222 APPLICATIONS INFORMATION Table 3. CONTROL Registers A – Read/Write BIT CONTROL 1 (D0h) CONTROL 2 (D4h) 7:6 GPIO1 Confi gure GPIO2 Confi gure 5 GPIO1 Output GPIO2 Output 4 Reserved Mass Write Enable 3 Channel 1 FET On Control ...
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APPLICATIONS INFORMATION Table 5. STATUS Registers C – Read BIT STATUS 1 (D2h) STATUS 2 (D6h) 7 FET On FET On 6 GPIO1 Input GPIO2 Input 5 Channel 1 FET Short Status Channel 2 FET Short Status EN1 Status EN2 ...
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LTC4222 APPLICATIONS INFORMATION Table 7. ADC Register Data Format: ADINn, SOURCEn, SENSEn MSB Bytes – Read/Write* BIT (7) BIT (6) BIT (5) Data (9) Data (8) Data (7) *Set bit ADC _CONTROL(0) before writing Table 8. ADC Register Data Format: ...
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TYPICAL APPLICATIONS V IN1 12V R10 3. HCPL-0300 3 SDA 6 HCPL-0300 5 R10 3.3k 2 SCL HCPL-0300 3 GND V IN2 3.3V BACKPLANE PLUG-IN CARD Figure 12. 3.3V and 12V Application with Sequenced Turn-On Optically Isolated I ...
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LTC4222 PACKAGE DESCRIPTION 5.50 0.05 4.10 0.05 3.45 0.05 3.50 REF (4 SIDES) 3.45 0.05 RECOMMENDED SOLDER PAD LAYOUT APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 5.00 0.10 (4 SIDES) PIN 1 TOP MARK (NOTE 6) NOTE: 1. ...
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... FLASH SHALL NOT EXCEED .254mm (.010") PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...
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... Operates from 1V to 13.5V, Multifunction Current Control, SSOP-16 Operates from 1V to 6V, Compact, MSOP-10 or (3mm × 2mm) DFN-10 www.linear.com ● 12V 100k LOAD μTCA 1 PLUG-IN CARD 1 μTCA PLUG-IN LOAD CARD 2 2 100k 12V BACKPLANE 4222 TA02a LT 0309 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2008 4222fa ...