Document
Step Down / Step Up / Inverting DC-DC Converter MC34063C
FEATURES
z Operating from 3V to 40V z Low Standby Current z Current Limiting z Output Switch Current to 1.2A z Output Voltage Adjustable z Operation Frequency up to 180kHz (CT=100pF) z Precision 2% Reference z Available in SOP-8 and DIP-8 Packages z Moisture Sensitivity Level 3 for SMD Package
SOP-8 PKG DIP-8 PKG
APPLICATION
z Battery Chargers z NICs / Switches / Hubs z ADSL Modems z Negative Voltage Power Supplies
ORDERING INFORMATION Device
MC34063CD MC34063CN
Package SOP-8 DIP-8
DESCRIPTION
The 34063C is a monolithic switching regulator control circuit containing the primary functions required for DC-DC converters. This device consists of internal temperature compensated reference, voltage comparator, controlled duty cycle oscillator with active current limit circuit, driver and high current output switch. The device is specifically designed to be used in Step-Down, Step-Up and Voltage-Inverting applications with a minimum number of external components.
The MC34063C is the enhanced version of MC34063A/B with the ability to work in higher frequency.
Absolute Maximum Ratings (Note 1)
CHARACTERISTIC
Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VSWC=40V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 2) Switch Current
SYMBOL
VCC VIR VSWC VSWE VCE Vdc Idc ISW
MIN.
-0.3
-
MAX.
40 40 40 40 40 40 100 1.2
UNIT
V V V V V V mA A
Apr. 2011 - Rev.1.2
-1 -
HTC
Step Down / Step Up / Inverting DC-DC Converter MC34063C
Absolute Maximum Ratings (Continued)
CHARACTERISTIC
SYMBOL
MIN.
MAX.
UNIT
Power Dissipation (at TA = 25°C)
SOP-8 DIP-8
PDMAX_SOP-8 PDMAX_DIP-8
1.250 0.625
W W
Thermal Resistance
SOP-8 DIP-8
θJA-SOP-8 θJA-DIP-8
100 °C/W 160 °C/W
Operating Junction Temperature Range
TJ -40 150 °C
Storage Temperature Range
TSTG
-65 150 °C
Note 1. Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied.
RECOMMENDED OPERATING CONDITIONS
CHARACTERISTIC
SYMBOL
Supply Voltage Operating Ambient Temperature
VCC TA
MIN.
3 -40
MAX.
40 85
UNIT
V °C
Ordering Information
Package
Order No.
SOP-8 DIP-8
MC34063CD MC34063CN
Description
1.2A, 180kHz 1.2A, 180kHz
Supplied As
Reel Tube
Status
Active Active
MC 34063
Package Type
D : SOP-8 N : DIP-8
Switch Current : C : 1.2A
Root Name
Product Code
Apr. 2011 - Rev.1.2
-2 -
HTC
Step Down / Step Up / Inverting DC-DC Converter MC34063C
PIN CONFIGURATION
18 27 36 45
SOP-8
PIN DESCRIPTION
Pin No.
1 2 3 4 5 6
7
8
Name Switch Collector Switch Emitter Timing Capacitor GND Comparator Inverting Input VCC
IPK Sense
Driver Collector
1 2 3 4
DIP-8
8 7 6 5
SOP-8 / DIP-8 PKG
Function
Internal switch transistor collector Internal switch transistor emitter Timing Capacitor to control the switching frequency Ground pin for all internal circuit.