Electronic Components Datasheet Search |
|
MIC38C42 Datasheet(PDF) 1 Page - Micrel Semiconductor |
|
MIC38C42 Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 11 page MIC38C42/3/4/5 Micrel, Inc. July 2005 1 M9999-072805 MIC38C42/3/4/5 BiCMOS Current-Mode PWM Controllers General Description The MIC38C4x are fixed frequency, high performance, cur- rent-mode PWM controllers. Micrel’s BiCMOS devices are pin compatible with 384x bipolar devices but feature several improvements. Undervoltage lockout circuitry allows the ’42 and ’44 versions to start up at 14.5V and operate down to 9V, and the ’43 and ’45 versions start at 8.4V with operation down to 7.6V. All versions operate up to 20V. When compared to bipolar 384x devices operating from a 15V supply, start-up current has been reduced to 50µAtypical and operating current has been reduced to 4.0 mA typical. De- creased output rise and fall times drive larger MOSFETs, and rail-to-rail output capability increases efficiency, especially at lowersupplyvoltages. TheMIC38C4x alsofeaturesatrimmed oscillator discharge current and bandgap reference. TheMIC38C4xdenotes8-pinplasticDIPandSOICpackages. MIC384Cx-1 denotes 14-pin plastic DIPand SOIC packages. 8-pindevicesfeaturesmallsize,while14-pindevicesseparate the analog and power connections for improved perfomance and power dissipation. For fast rise and fall times and higher output drive, refer to the MIC38HC4x. Functional Diagram Features • Fast 40ns output rise and 30ns output fall times • –40°C to +85°C temperature range meets UC284x specifications • High-performance, low-power BiCMOS Process • Ultralow start-up current (50µA typical) • Low operating current (4mA typical) • CMOS outputs with rail-to-rail swing • ≥ 500kHz current-mode operation • Trimmed 5V bandgap reference • Pin-for-pin compatible with UC3842/3843/3844/3845(A) • Trimmed oscillator discharge current • UVLO with hysteresis • Low cross-conduction currents Applications • Current-mode, off-line, switched-mode power supplies • Current-mode, dc-to-dc converters. • Step-down “buck” regulators • Step-up “boost” regulators • Flyback, isolated regulators • Forward converters • Synchronous FET converters T Q S R Q R 2R Oscillator UVLO 5V Reference VDD 7 (12) VREF 8 (14) RT/CT 4 (7) FB 2 (3) 2.5V COMP 1 (1) GND* (AGND) 5 (9) ISNS 3 (5) OUT 6 (10) ( ) pins are on MIC38C4x-1 (14-lead) versions only * MIC38C4x, (8-lead) versions only † ‡ (VD) (11) (PGND) (8) 35V * * † MIC38C42, MIC38C43 (96% max. duty cycle) versions only ‡ MIC38C44, MIC38C45 (50% max. duty cycle) versions only MM8 is a trademark of Micrel, Inc. Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com |
Similar Part No. - MIC38C42 |
|
Similar Description - MIC38C42 |
|
|
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 |