TC35C25COE

1 TC25C25 TC35C25 BICMOS PWM CONTROLLERS FEATURES s s s s s s s s s s s s s Low Power BICMOS Construction Low Supply Current at 20 kHz ............... 1.0mA Typ Latch-Up Immunity ................. >500mA on Outputs Below Rail Input Protection .............................. – 5V High Output Drive ................................ 500mA Peak Fast Rise/Fall Time ..................... 50nsec @ 1000pF High Frequency Operation .................. Up to 1MHz Tri-state Sync Pin for Easy Parallel Operation Under Voltage Hysteresis Guaranteed Shutdown Pin Available Double-Ended Soft Start, With Small Cap Low Prop Delay Shutdown to Output ................................................. 140nsec Typ. GENERAL DESCRIPTION The TC35C25 family of PWM controllers are CMOS implementations of the industry standard 3525 voltage mode SMPS ICs. These second generation CMOS devices employ TelCom Semiconductors' Tough BiCMOS™ process for latch-up proof operation. They offer much lower power consumption than any of their previous CMOS or bipolar counterparts. These controllers have separate supply pins for the control and output sections of the circuit. This allows "bootstrap" operation. The CMOS output stage allows the output voltage to swing to within 25mV of either rail. Other improved features include tighter hysteresis and undervoltage start-up specifications over temperature, and very low input bias current on all inputs. 2 3 4 5 ORDERING INFORMATION Part No. TC25C25EOE TC25C25EPE TC35C25COE TC35C25CPE Configuration Non-Inverting Pkg./Temperature 16-Pin SOIC (Wide) – 40°C to +85°C Non-Inverting 16-Pin Plastic DIP (Narrow) – 40°C to +85°C Non-Inverting 16-Pin SOIC (Wide) 0°C to +70°C Non-Inverting 16-Pin Plastic DIP (Narrow) 0°C to +70°C FUNCTIONAL BLOCK DIAGRAM VREF + VIN GND SYNC RT CT DISCH 16 15 12 3 6 5 7 R COMP 9 CMPTR S PWM LATCH IN– IN+ SOFT START SHUTDOWN 1 2 8 ERROR AMP +6V 50µA R OSC FLIP FLOP UNDER VOLTAGE +4V REF OSC OUT 4 REFERENCE REGULATOR 35C25 13 VDD 11 A 6 7 +6V 14 B 10 8 TC25/35C25-2 10/1/96 TELCOM SEMICONDUCTOR, INC. 4-111 BICMOS PWM CONTROLLERS TC25C25 TC35C25 ABSOLUTE MAXIMUM RATINGS* Supply Voltage ............................................................18V Maximum Chip Temperature ................................... 150°C Storage Temperature ............................ – 65°C to +150°C Lead Temperature (10 sec) ..................................... 300°C Package Thermal Resistance PDIP RθJ-A ..................................................................... 125°C/W PDIP RθJ-C ........................................................................ 45°C/W SOIC RθJ-A ..................................................................... 250°C/W SOIC RθJ-A ........................................................................ 75°C/W Operating Temperature 25C2x ........................................ – 40°C ≤ TA ≤ +85°C 35C2x ............................................. 0°C ≤ TA ≤ +70°C *Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for – 40°C < TA < +85°C for the TC25C25Exx; and 0°C