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MC34063AB Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer MC34063AB
Beschreibung DC-DC converter control circuits
Hersteller STMicroelectronics
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Gesamt 23 Seiten
MC34063AB Datasheet, Funktion
DIP-8
SO-8
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
MC34063AB, MC34063AC,
MC34063EB, MC34063EC
DC-DC converter control circuits
Datasheet - production data
Description
The MC34063A/E series is a monolithic control
circuit which delivers 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 device series is
designed for step-down, step-up and voltage-
inverting applications.
DIP-8
MC34063ABN
MC34063ACN
MC34063EBN
MC34063ECN
Table 1. Device summary
Order codes
SO-8
MC34063ABD-TR
MC34063ACD-TR
MC34063EBD-TR
MC34063ECD-TR
April 2013
This is information on a product in full production.
DocID5257 Rev 11
1/23
www.st.com
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MC34063AB Datasheet, Funktion
Electrical characteristics
MC34063AB, MC34063AC, MC34063EB, MC34063EC
4 Electrical characteristics
Refer to the test circuits, VCC = 5 V, TA = TLOW to THIGH, unless otherwise specified. (a)
Symbol
Parameter
Table 5. Oscillator
Test conditions
fOSC
Frequency
ICHG
Charge current
IDISCHG Discharge current
IDISCHG/ICHG
Discharge to charge
current ratio
VPIN5 = 0V, CT = 1 nF, TA = 25°C
VCC = 5 to 40V, TA = 25°C
VCC = 5 to 40V, TA = 25°C
PIN 7 = VCC, TA = 25°C
VIPK(sense) Current limit sense voltage ICHG = IDISCHG, TA = 25°C
Min. Typ. Max. Unit
24 33 42 kHz
24 33 42 µA
140 200 260 µA
5.2 6.2 7.5 µA
250 300 350 mV
Symbol
Parameter
Table 6. Output switch
Test conditions
VCE(sat)
Saturation voltage, Darlington
connection
ISW = 1 A, PIN 1, 8 connected
VCE(sat) Saturation voltage
ISW = 1 A, RPIN8 = 82 to VCC
Forced ~ 20
hFE
IC(off)
DC current gain
Collector off-state current
ISW = 1 A,VCE = 5 V, TA = 25°C
VCE = 40 V
Min. Typ. Max. Unit
1 1.3 V
0.45 0.7
V
50 120
0.01 100 µA
Symbol
Parameter
VTH Threshold voltage
Regline
IIB
Threshold voltage line
regulation
Input bias current
Table 7. Comparator
Test conditions
TA = 25°C
TA = TLOW to THIGH
VCC = 3 to 40 V
VIN = 0 V
Min.
1.225
1.21
Typ.
1.25
Max.
1.275
1.29
Unit
V
1 5 mV
-5 -400 nA
6/23
a. TLOW = 0 °C, THIGH = 70 °C (AC and EC series); TLOW = -40 °C, THIGH = 85 °C (AB series); TLOW = -40 °C,
THIGH = 125 °C (EB series)
DocID5257 Rev 11

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MC34063AB pdf, datenblatt
Typical application circuit
MC34063AB, MC34063AC, MC34063EB, MC34063EC
Figure 17. Voltage inverting converter
Figure 18. Printed evaluation board
PIN 1 = VOUT
PIN 2 = GND
PIN 3 = GND
PIN 4 = VIN
Test
Line regulation
Load regulation
Output ripple
Efficiency
ISC
Table 11. Test condition (VOUT = 12 V)
Conditions
VIN = 4.5 to 6 V, IO = 100 mA
VIN = 5 V, IO = 10 to 100 mA
VIN = 5 V, IO = 100 mA
VIN = 5 V, IO = 100 mA
VIN = 5 V, RLOAD = 0.1
Value (typ.)
15
20
230
58
0.9
Unit
mV
mV
mV
%
A
12/23
DocID5257 Rev 11

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