SC1548
SC1548 is Linear Fet Controller manufactured by SEMTECH.
Description
The SC1548 is a power supply controller designed to provide a simple single regulated power supply with over current protection. It is part of Semtechs Smart LDO family of products. The SC1548 can provide a 1.818V power supply for the I/O plane or 1.515V for GTL+ / AGP from either 3.3V or 2.5V. An adjustable option allows generation and control of any voltage from 1.263V up to 5V. SC1548 Features include tight output voltage regulation, an enable control and over current protection. Over current protection is provided by feedback to the sense pin. If the output drops below 50% of the nominal output voltage (typical) for greater than 4ms (typical), the output will be shut down. The SC1548 is available in a tiny 5-pin SOT-23 surface mount package.
Features u ± 2.5% output accuracy over line, load and u 1.515V, 1.818V and adjustable output voltage u Enable control u Over current protection u 5-pin SOT-23 package options available temperature
Applications u u u u
Motherboards Graphics cards Microcontrollers Simple power supplies
Typical Application Circuit
Fixed Output Voltage Versions
1.818V OUT + C1 100u F + C2 100u F Q1 IRL530N 3.3V IN 12V IN
+
C3 22u F 1 2 3
U1 SNS GND DRV IN 4 C4 0.1u F EN 5 ENABLE
SC1548CSK-1.8
Adjustable Output Voltage Version
Q1 IRL530N 3.3V IN 12V IN
2.5V OUT R1 97.6 + C1 100u F + C2 100u F
+
C3 22u F U1 1 2 ADJ GND DRV IN 4 C4 0.1u F EN 5 ENABLE
R2 100
SC1548CSK
Revision 1, January 2001
.semtech.
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Input Supply Voltage Input Pi ns Thermal Impedance Juncti on to C ase Thermal Impedance Juncti on to Ambi ent Operati ng Ambi ent Temperature Range Operati ng Juncti on Temperature Range Storage Temperature Range Lead Temperature (Solderi ng) 10 Sec Sy mbol VIN VADJ, VEN, VSNS q JC q JA TA TJ TSTG TLEAD Maximum -0.5 to +15 -0.5 to +7 81 256 0 to +70 0 to +125 -65 to +150 300 U nits V V °C /W °C /W °C °C °C °C
Electrical Characteristics(1)
Unless specified:...
