Fairchild Semiconductor MC34063A, MC33063A Datasheet

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MC34063A/MC33063A

SMPS Controller

	Features	Description
	• Operation from 3.0 to 40V input	The MC34063A/MC33063A is a monolithic regulator sub
	• Short circuit current limiting	system intended for use as DC to DC converter. This device
	• Low standby current	contains a temperature compensated bandgap reference, a
	• Output switch current of 1.5A without external transistors	duty cycle control oscillator, driver and high current output
	• Output voltage adjustable	switch. It can be used for step down, step up or inverting
	• Frequency of operation from 100Hz to 100KHz	switching regulators as well as for series pass regulators.
	• Step up, Step down or inverting switching regulators
		8-DIP

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8-SOP

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Internal Block Diagram

Rev. 1.0.2

©2001 Fairchild Semiconductor Corporation

MC34063A/MC33063A

Absolute Maximum Ratings

Parameter	Symbol	Value	Unit
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
Storage Temperature Range	TSTG	- 65 ~ + 150	° C

Electrical Characteristics

(VCC = 5.0V, TA = 0° C to +70° C for the MC34063, TA= -40° C to the +85° C for the MC33063, unless otherwise specified)

	Parameter	Symbol	Conditions	Min.	Typ.	Max.	Unit
	OSCILLATOR
	Charging Current	ICHG	VCC = 5 to 40V	22	31	42	A
			TA = 25° C
	Discharging Current	IDISCHG	VCC = 5 to 40V	140	190	260	A
			TA = 25° C
	Oscillator Amplitude	V(OSC)	TA = 25° C	-	0.5	-	V
	Discharge To Charge Current Ratio	K	V7 = VCC , TA = 25° C	5.2	6.1	7.5	-
	Current Limit Sense	VSENSE(C.L)	ICHG = IDISCHG	250	300	350	mV
	Voltage		TA = 25° C
	OUTPUT SWITCH
	Saturation Voltage 1 (Note)	VCE(SAT)1	ISW = 1.0A	-	0.95	1.3	V
			VC(driver) = VC(SW)
	Saturation Voltage 2 (Note)	VCE(SAT)2	ISW = 1.0A,	-	0.45	0.7	V
			VC(driver) = 50mA
	DC Current Gain (Note)	GI(DC)	ISW = 1.0A,	50	180	-	-
			VCE = 5.0V, TA = 25° C
	Collector off State Current (Note)	IC(OFF)	VCE = 40V, TA = 25° C	-	0.01	100	A
	COMPARATOR
	Threshold Voltage	VTH	-	1.21	1.24	1.29	V
	Threshold Voltage Line Regulation	∆ VTH	VCC = 3 to 40V	-	2.0	5.0	mV
	Input Bias Current	IBIAS	VI = 0V	-	50	400	nA
	TOTAL DEVICE
	Supply Current		VCC = 5 to 40V
	MC34063	ICC	CT = 0.001uF	-	-	4.0	mA
			V7 = VCC, V5>VTH
			pin2 = GND
	MC33063			-	-	5.0

Note :

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

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MC34063A/MC33063A

Typical Performance Characteristics

Temperature (° C)	Temperature (° C)
Figure 1. Temperature Drift (VTH)	Figure 2. Temperature Drift (IOC)

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