UTC UTCMC34063A Datasheet

UTC MC34063A LINEAR INTEGRATED CIRCUIT

DC TO DC CONVERTER
CONTROLLER

DESCRIPTION

The UTC MC34063A is a monolithic regulator
subsystem, intended for use as DC to DC converter.
This device contains a temperature compensated band
gap reference, a duty-cycle control oscillator, driver
and high current output switch. It can be used for step
down, step-up or inverting switching regulators as well
as for series pass regulators.

FEATURES

*Operation from 3.0V to 40V.
*Short circuit current limiting.
*Low standby current.
*Output switch current of 1.5A without external
transistors.
*Frequency of operation from 100Hz to 100kHz.
*Step-up, step-down or inverting switch regulators.

PIN CONFIGURATION

Switch

Collector

Switch

Emitter

Timing

Capacitor

Gnd

1

2

3

4

8

7

6

5

Driver

Collector

Lpk Sense

Vcc

Comparator

Inverting input

SOP-8

DIP-8

BLOCK DIAGRAM

E

SWITCH

COLLECTOR

SWITCH

EMITTER

TIMING

CAPACITOR

GND

T2

1

T1

2

A

3 6

1.25Vref

Q

CT

C

OSCILLATOR

S
R

Is

COMP.

DRIVE

8

COLLECTOR

D

Ipeak

7

SENSE

Vcc

COMPARATOR

54

B

INVERTING INPUT

UTC UNISONIC TECHNOLOGIES CO., LTD. 1

QW-R103-008,A

UTC MC34063A LINEAR INTEGRATED CIRCUIT

ABSOLUTE MAXIMUM RATINGS(Ta=25°C )

Supply Voltage Vcc 40 V
Comparator input voltage range Vi(comp) -0.3~+40 V
Switch collector voltage Vc(sw) 40 V
Switch Emitter Voltage Ve(sw) 40 V
Switch collector to emitter voltage Vce(sw) 40 V
Driver collector Voltage Vc(dr) 40 V
Switch current Isw 1.5 A

ELECTRICAL CHARACTERISTICS( Ta=25°C )

(Vcc=5.0V,Ta=0~70°C,unless otherwise specified)

Oscillator

Charging Current Ichg
Discharging Current Idischg
Oscillator Amplitude Vosc
Discharge to Charge Current Ratio K
Current limit Sense Voltage Vsense Ichg=Idischg

Output Switch

Saturation Voltage 1(note) Vce(sat)1 Isw=1.0A
Saturation Voltage 2(note) Vce(sat)2 Isw=1.0A
DC Current Gain(note) Gi(DC) Isw=1.0A

Collector Off State Current(note) C(off)

Comparator

Threshold Voltage Vth 1.21 1.24 1.29 V
Threshold voltage Line Regulation Vth Vcc=3~40V 2.0 5.0 mV
Input Bias Current Ibias Vi=0V 50 400 nA

Total Device

Supply Current Icc V7=Vcc 2.7 4.0 mA

PARAMETER SYMBOL VALUE UNIT

PARAMETER SYMBOL TEST CONDITIONS MIN TYP. MAX UNIT

Vcc=5 to 40V,Ta=25°C
Vcc=5 to 40V,Ta=25°C

Ta=25°C

V7=Vcc,Ta=25°C

Ta=25°C

Vc(driver)=Vc(sw)

Vc(driver)=50mA

Vce=5.0V,Ta=25°C

Vce=40.0V,Ta=25°C

Vcc=5~40V

Ct=0.001

Vc>Vth

Pin2=GND

22 31 42

140 190 260

0.5 V

5.2 6.1 7.5

250 300 350 mV

0.95 1.3 V

0.45 0.7 V

50 180

0.01 100

µA
µA

µA

NOTE: Output switch tests are performed under pulsed conditions to minimize power dissipation.

UTC UNISONIC TECHNOLOGIES CO., LTD. 2

QW-R103-008,A