Electronic Components Datasheet Search |
|
LTC1644IGN Datasheet(PDF) 10 Page - Linear Technology |
|
LTC1644IGN Datasheet(HTML) 10 Page - Linear Technology |
10 / 24 page LTC1644 10 1644f BLOCK DIAGRA When the TIMER pin is high, the circuit breaker function is enabled. If the voltage across the sense resistor exceeds 55mV but is less than 150mV, the circuit breaker is tripped after a 45 µs time delay. In the event the sense resistor voltage exceeds 150mV, the circuit breaker trips immedi- ately and the chip latches off. To disable the current limit, 3VSENSE and 3VIN can be shorted together. 3VIN (Pin 17): 3.3V Supply Sense Input. An undervoltage lockout circuit prevents the switches from turning on when the voltage at the 3VIN pin is less than 2.48V. If no 3.3V input supply is available, connect two series diodes between 5VIN and 3VIN (tie anode of first diode to 5VIN and cathode of second diode to 3VIN, see Figure 11). PI FU CTIO S 3VOUT (Pin 18): Analog Input used to monitor the 3.3V output supply voltage. The PWRGD pin cannot pull low until the 3VOUT pin voltage exceeds 2.9V. If no 3.3V input supply is available, tie the 3VOUT pin to the 5VOUT pin. VEEOUT (Pin 19): –12V Supply Output. A 1Ω switch is connected between VEEIN and VEEOUT. VEEOUT must ex- ceed –10.5V before the PWRGD pin pulls low unless the VEE PWRGD function is disabled by grounding the VEEIN pin. 12VOUT (Pin 20): 12V Supply Output. A 0.5Ω switch is connected between 12VIN and 12VOUT. 12VOUT must exceed 11.1V before the PWRGD pin can pull low. Q6 VEEIN 2 TIMER 4 VEEOUT 19 3VOUT 18 5VOUT 3 – + +– Q9 NOTE: V12VIN – VTIMER < 1V = TIMER HI, V12VIN – VTIMER > 1V = TIMER LOW Q8 Q2 Q3 225 µA 65 µA GATE 5VOUT TIMER 51mV, TIMER LO 150mV, TIMER HI 55mV 12VIN 15 5VSENSE 14 12VIN 1 12VOUT 20 5VIN 13 – + +– +– 2.5V UVL 8.3V UVL – + +– 3VOUT 55mV CP3 REF 3VSENSE 16 3VIN 17 RESETOUT 10 – + – + +– +– 2.5V UVL Q4 1V Q12 CP4 REF – + + – CP7 REF – + CP5 REF – + RESETIN 9 PWRGD 7 Q10 FAULT 6 Q11 OFF/ON 5 Q5 Q7 21 µA 12VIN GND 8 DRIVE 11 PRECHARGE 1644 BD 12 LOGIC Q1 TIMER 51mV, TIMER LO 150mV, TIMER HI CP1 A1 CP2 A2 A3 |
Similar Part No. - LTC1644IGN |
|
Similar Description - LTC1644IGN |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |