MC34063AB STMICROELECTRONICS | Alldatasheet
Document overview
- Manufacturer or author: pROVIDED bY alldatasheet.com(free datasheet download site)
- PDF pages: 23
Technical content
Datasheet sections
- 1 Diagram
- 2 Pin configuration
- 3 Maximum ratings
- 4 Electrical characteristics
- 5 Typical performance characteristics
- 6 Typical application circuit
- 7 Package mechanical data
- 8 Revision history
Features
■ Output switch current in excess of 1.5 A ■ 2 % reference accuracy ■ Low quiescent current: 2.5 mA (typ.) ■ Operating from 3 V to 40 V ■ Frequency operation to 100 kHz ■ Active current limiting
Description
The MC34063A/E series is a monolithic control circuit delivering the main functions for DC/DC voltage converting. The device contains an internal temperature compensated reference, comparator, duty cycle controlled oscillator with an active current limit circuit, driver and high current output switch. Output voltage is adjustable through two external resistors with a 2 % reference accuracy. Employing a minimum number of external components the MC34063A/E devices series is designed for step-down, step-up and voltage- inverting applications. SO-8DIP-8 Table 1. Device summary
- The "A" version is not recommended for new designs.
1 Diagram
Figure 1. Block diagram
2 Pin configuration
Figure 2. Pin connections Table 2. Pin description
1 SWC Switch collector
2 SWE Switch emitter
3 TC Timing capacitor
4 GND Ground
5 CII Comparator inverting input
8 DRC Voltage driver collector
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3. Absolute maximum ratings Table 4. Thermal data
- This value depends from thermal design of PCB on which the device is mounted.
4 Electrical characteristics
Table 5. Oscillator Table 6. Output switch Table 7. Comparator
Note: 1 Maximum package power dissipation limit must be observed. TLOW = -40 °C, THIGH = 125 °C (EB series).
3 If darlington configuration is not used, care must be taken to avoid deep saturation of output
4 Start-up voltage is the minimum power supply voltage at which the internal oscillator begins
Table 8. Total device a. Current less due to a built in 1 k Ω anti leakage resistor.
5 Typical performance characteristics
Figure 3. Emitter follower configuration Figure 4. Output switch ON-OFF time vs Figure 5. Common emitter configuration Figure 6. Darlington configuration collector
6 Typical application circuit
Figure 13. Step-up converter Figure 14. Printed evaluation board Table 9. Test condition (V OUT = 28 V)
Table 12. Calculation
Figure 25. Higher output power, higher input voltage
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
Dim. mm. inch. A 3.3 0.130 a1 0.7 0.02 8 B1 . 39 1.65 0.055 0.065 B1 0. 91 1.04 0.0 36 0.041 b 0.5 0.020 b10 . 38 0.5 0.015 0.020 D 9.8 0.386 E 8.8 0.346 e 2.54 0.100 e3 7.62 0. 300 e4 7.62 0. 300 F 7.1 0.2 80 I4 . 8 0.189 L 3.3 0.130 Z 0.44 1.6 0.017 0.06 3 Plastic DIP-8 mechanical data P001F
Dim. mm. inch. A1 . 35 1.75 0.05 3 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.04 3 0.065 B0 . 33 0.51 0.01 3 0.020 C0 . 1 9 0.25 0.007 0.010 D4 . 80 5.00 0.1 89 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H5 . 80 6.20 0.22 8 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k 8° (max.) ddd 0.1 0.04 SO-8 mechanical data 0016023/C
Dim. mm. inch. A 330 12. 992 C 12. 8 13.2 0.504 0.51 9 D 20.2 0.7 95 N6 0 2 . 362 T 22.4 0. 882 Ao 8.1 8.5 0. 319 0.335 Bo 5.5 5. 9 0.216 0.2 32 Ko 2.1 2. 3 0.082 0.0 90 Po 3.9 4.1 0.15 3 0.161 P7 . 98 .1 0. 311 0. 319 Tape & reel SO-8 mechanical data
8 Revision history
Table 13. Document revision history