MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4 F, 9 In d us tr y E. 9 th R oa d , S c ie n ce - ba se d In d us t ri a l P a r k , H si n ch u, T ai w an , R. O .C . TEL: (8863)577-2500 FAX:(8863)577-2510 1
! FEATURES
" 3V to 30V Input Voltage Operation.
" Internal 1.6A Peak Current Switch.
" Internal ±1.8% Reference.
" Low Quiescent Cur rent at 1.6m A.
" Frequency Operation from 100Hz to 100KHz.
" Current Limiting.
! APPLICATIONS
" Saver for Cellular phones
" DC-DC Converter Module
! DESCRIPTION
The MC34063A by Analog Integrations
Corporation, an improved second source over the
industrial standard MC34063A, is a monolithic
control circuit containing the primary functions
required for DC/DC converters. The device
consists of an internal temperature compensated
reference, comparator, controlled duty cycle
oscillator with an active current limit circuit, driver
and high current output switch. This device is
specifically designed to be incorporated in step-
down, step-up and voltage-inverting applications
with a minimum number of external components.
The ±1.8% internal reference and low quiescent
current of 1.6mA are among the improvements of
the device over the competition.
! TYPICAL APPLICATION CIRCUIT
MC34063A
IPK
8
7
6
54
3
2
1
FB
VCC
DRI SC
SE
TC
GND
VIN
L
200µH
RB
33K
C1
D1
1N5819
CT
470pF
RA
5.6K
*RS
VOUT
8.6V SAV ER
*:Io=0.3/RS
+100µF
220µF
CO
+
Saver Circ uit for Cellular Phone
! ORDERING INFORMATION
MC34063A XX ORDER NUMBER
MC34063ACN
(PLASTIC DIP)
PIN CONFIGURATION
MC34063ACS
(PLASTIC SO)
TOP VIEW
VCC
DRI
SE
TC
GND
IPK
FB
SC 1
3
4
28
6
5
7
PACKAG E TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE
C: 0°C~+70°C
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4 F, 9 Ind u st ry E . 9th R o ad, S ci ence- b ase d I ndu s tr ial Par k , H si n ch u , Tai wan, R . O.C . TEL: (8863)577-2500 FAX:(8863)577-2510 2
! ABSOLUTE MAXIMUM RATINGS
Supply Voltage ......................................................…………..................................... 30V
Comparator Input Voltage Range ..................................………….................... -0.3V~30V
Switch Collector Voltage .......................................……………......................................30V
Switch Emitter Voltage ..................................…………….............................................30V
Switch Collector to Emitter Voltage .....................…………..........................................30V
Driver Collector Vo lta ge .................................……………............................................30V
Switch Current ............................................……………..............................................1.6A
Power Dissipation and Thermal Characteristics
DIP Package
Ta= 25°C...............................………….............................1.0W
Thermal Resistance .................……….......................100°C /W
SO Package
Ta= 25°C.................................…………….......................625mW
Thermal Resistance .................……….......................160°C /W
Operating Junction Temperature ................................…………..….............................125°C
Operating Ambient Temperature Range .................……...…...............................0°C~70°C
Storage Temperature Range.....................……………....…........................... - 65°C~150°C
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4 F, 9 Ind u st ry E . 9th R o ad, S ci ence- b ase d I ndu s tr ial Par k , H si n ch u , Tai wan, R . O.C . TEL: (8863)577-2500 FAX:(8863)577-2510 3
! ELECTRICAL CHARACTERISTICS ( V CC= 5V, Ta=2 5°
°°
°C, unless otherwise specified.)
PARAMETER
TEST CONDITIO NS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Oscillator
Charging Current 5.0V≤VCC≤30V ICHG 10 25 40
µA
Discharge Current 5.0V≤VCC≤30V IDISCHG 100 150 200
µA
Voltage Swing PIN 3 VOSC 0.6 V
Discharge to Charge Current
Ratio VIPK(SENSE) =VCC IDISCHG/ ICHG 6.0
Current Limit Sense Voltage ICHG=IDISCHG VIPK(SENSE) 250 300 350 mV
Output Switch
Satur ation Vol tag e, Dar lington
Connection ISW=1.0A;
VC(DRIVER)=VC(SWITCH)
VCE(SAT) 1.0 1.3 V
Satur ati on Voltage ISW=1.0A; IC(DRIVER)=50mA
(Forced β≅20) VCE (SAT) 0.4 0.7 V
DC Current Gain ISW=1.0A; VCE=5.0V hFE 35 120
Collector Off-State Current VCE=30V IC(OFF) 10 nA
Comparator
Threshold Voltage
Threshold Voltage
0°C≤Ta≤70°C VFB 1.227
1.21
1.25 1.273
1.29
V
V
Threshold Voltage Line
Regulation 3.0V≤VCC≤30V REGLINE 0.1 0.3 mV/V
Input Bias Current VIN=0V IIB 0.4 1
µA
Supply current
VIPK(SENSE)=VCC
VPIN 5>VFB
5.0V≤VCC≤30V
CT=0.001µF, PIN 2=GND
Remaining pi ns open
ICC 1.6 3 mA
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4 F, 9 Ind u st ry E . 9th R o ad, S ci ence- b ase d I ndu s tr ial Par k , H si n ch u , Tai wan, R . O.C . TEL: (8863)577-2500 FAX:(8863)577-2510 4
! TYPICAL PERFORMANCE CHARACTERISTICS
CT, Oscillator Timing Capacitor (nF)
tON-OFF Ou tput Switch ON-OFF Time (µS)
Output Switch ON-OFF Time vs. Os cillato r
Timing Capacit or
0.1 110 100
110
OFF TIME
VCC=5V
VIPK=VCC
PIN5=GND
100 1000
ON TI ME
0510 15 20 25 30
0
0.4
0.8
1.2
1.6
2
CT=1nF
VIPK=VCC
PIN 2=GND
VCC, Supply Volta ge (V)
ICC, Supply Current (mA)
Standby Suppl y Cur r ent vs. Supply Voltage
VFB, Threshol d Volt age (V )
Tem
p
erature
(
°C
)
VFB, Th r eshold Voltage vs Temperature
010 20 30 40 50 60 70 80
1.2
1.22
1.24
1.26
1.28
1.3
VCC = 5V,
CT = 1nF
PIN 2 = GND
250
260
270
280
290
300
310
320
330
340
350
IPK Threshold Voltag e vs Temperature
Tem
p
erature
(
°C
)
VIPK, Threshold V oltage (m V )
0 10203040506070
80
VCC = 5V
CT = 1nF
PIN 5 = GND
Emmiter-Follower Configuration Output Switch
Saturation Voltage vs Emmiter Current
IE, Emitter Current (A)
1.2
1.3
1.4
1.5
1.6
1.7
1.8
VCE(SATE) Saturation Voltage (V)
0 0.5 1 1.5
VCC = 5V
PIN 1, 7, 8 = VCC
PIN 3, 5 = GND
IC, Collector Current (A)
VCE(SAT), Saturation Voltage (V)
1.5
Common-Emitter C onfiguration Output Switch
Saturation Voltage vs Collector Current
VCC = 5V
PIN 7 = VCC
PIN 2, 3, 5 = GND
Forced Beta = 20
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
00.5 1
VCC = 5.0V
PIN 7 =VCC
PINS 2, 3, 5 = GND
Darlington Connecti on
Forced Beta = 20
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4 F, 9 Ind u st ry E . 9th R o ad, S ci ence- b ase d I ndu s tr ial Par k , H si n ch u , Tai wan, R . O.C . TEL: (8863)577-2500 FAX:(8863)577-2510 5
! BLOCK DIAGRAM
Q
R
S
8
7
6
5
4
3
2
1
Q1
IS
CT
-
+
Q2
80
DRI
IPK
VCC
FB
GND
TC
SC
SE
Oscillator
Comparator
1.25V
Reference
Voltage
! PIN DESCRIPTIONS
PIN 1: SC - 1.6A switch collector
PIN 2: SE - Darlington switch emitter
PIN 3: TC - Oscillator timing capacitor
PIN 4: GND - Power GND
PIN 5: FB - Feedback comparator inverting input
PIN 6: VCC - Power supply input
PIN 7: IPK - Highside current sense input,
VCC - VIPK=300mV
PIN 8: DRI - Drive collector
! APPLICATION INFORMATION
• DESIGN FORM ULA TABLE
CALCULATION
STEP-DOWN
STEP-UP
VOLTAGE-INVERTING
t
tON
OFF
V + V
V - V - V
OUT F
IN(MIN) SAT OUT
V + V V
V - V
OUT F IN(MIN)
IN(MIN) SAT
- V + V
V - V
OUT F
IN SAT
(tON + tOFF) MAX 1
FMIN 1
FMIN 1
FMIN
CT4x10-5tON 4 x 10-5tON 4 x 10-5tON
IC (SWITCH) 2IOUT(MAX) 2IOUT(MAX) ()
t+t
t
ON OFF
OFF 2IOUT(MAX) ()
t+t
t
ON OFF
OFF
RS 0.33/IC(SWITCH) 0.33/ IC (SWITCH) 0.33/ IC (SWITCH)
L(MIN)
V - V -V
It
IN(MIN) SAT OUT
C(SWITCH) ON(MAX)
V - V
It
IN(MIN) SAT
C(SWITCH) ON(MAX)
V - V
It
IN(MIN) SAT
C(SWITCH) ON(MAX)
Co I (t +t
8V
C(SWITCH) ON OFF
RIPPLE (P - P)
)I t
VOUT ON
RIPPLE(P - P)
I t
VOUT ON
RIPPLE(P - P)
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-P2
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4 F, 9 Ind u st ry E . 9th R o ad, S ci ence- b ase d I ndu s tr ial Par k , H si n ch u , Tai wan, R . O.C . TEL: (8863)577-2500 FAX:(8863)577-2510 6
VSAT =Saturation voltage of the output switch.
VF=Forward voltage drop of the ringback rectifier
The following power supply characteristics must be
chosen:
VIN -Nominal input voltage.
VOUT -Desired outp ut vo ltag e,
VOUT =1.25 (1 + RB/RA)
IOUT -Desired outp ut curr ent .
FMIN -Minimum desired output switching frequency
at the selected values for VIN and IOUT.
VRIPPLE (P-P)-Desired peak-to-peak output ripple voltage.
In practice, the calculated value will need to
be increased due to the capacitor equivalent
series resistance and board layout. The
ripple voltage should be kept to a low value
since it will directly effect the line and load
regulation.
! APPLICATION EXAMPLES
MC34063A
8
7
6
54
3
2
1
DRI
IPK
FB
VCC
CS
SE
TC
GND
L
200µH
RB
3.6K
C1
CO
470µF
D1
1N5821
CT
470pF
RA
1.2K
RS
0.25
VOUT
VIN
5V/500mA
+100µF
+
Line Regulation VIN = 10V ~20V @ IO=500mA 40mV
Load Regulation VIN = 15V, @ IO=10mA ~ 500mA 5mV
Short Circ uit Current VIN =15V, @ RL = 0.1Ω 1.3A
Fig. 1 Step-Down Converter
7
6
54
3
2
1
8
RS
C1
+
RS RB
CT
R2 R1
Q1
L
Co+
D1
MC34063A
DRI
IPK
FB
VCC
CS
SE
TC
GND
VOUT
VIN
Fig. 2 Step-Down Converter with External PNP Saturation Switch
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-P2
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4 F, 9 Ind u st ry E . 9th R o ad, S ci ence- b ase d I ndu s tr ial Par k , H si n ch u , Tai wan, R . O.C . TEL: (8863)577-2500 FAX:(8863)577-2510 7
! APPLICATION EXAMPLES (CONTINUED)
D1
8
7
6
54
3
2
1
L
200µH
RB
47K
RA
2.2K
C1
CO
220µF
CT 680pF
RS
0.22
2V/200mA
1N5819
100µF
+
+
R1
150
MC34063A
DRI
IPK
FB
VCC
CS
SE
TC
GND
VOUT
VIN
Line Regulation VIN = 8V ~16V @ IO=200mA 100mV
Load Regulation VIN = 12V, @ IO=80mA ~ 200mA 5mV
Fig. 3 Step-Up Converter
8
7
6
54
3
2
1+
RS
C1
+R2
RA
CT
RB
R1
Q
L
CO
D1
MC34063A
DRI
IPK
FB
VCC
CS
SE
TC
GND
VOUT
VIN
Fig. 4 Step-Up Converter with External NPN Switch
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-P2
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4 F, 9 Ind u st ry E . 9th R o ad, S ci ence- b ase d I ndu s tr ial Par k , H si n ch u , Tai wan, R . O.C . TEL: (8863)577-2500 FAX:(8863)577-2510 8
! APPLICATION EXAMPLES (CONTINUED)
D1
1N5819
RB
8.2K
RA
953
C1
100µF
CO
470µF
CT
680pF
SRS
0.25
8
7
6
5
4
3
2
1
-12V/100mA
4.5V~6V
+
+
L
100µH
MC34063A
DRI
IPK
FB
VCC
CS
SE
TC
GND
VOUT
VIN
Line Regulation VIN = 4.5V ~6V @ IO=100mA 20mV
Load Regulation VIN = 5V, @ IO=10mA ~ 100mA 100mV
Fig.5 Inverting Converter
8
7
6
54
3
2
1
+
+
RS
C1
R2
RB
CT
RA
R1 Q1
L
CO
D1
MC34063A
DRI
IPK
FB
VCC
CS
SE
TC
GND
VOUT
VIN
Fig 6. Voltage Inverting Converter With PNP Saturated Switch
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-P2
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4 F, 9 Ind u st ry E . 9th R o ad, S ci ence- b ase d I ndu s tr ial Par k , H si n ch u , Tai wan, R . O.C . TEL: (8863)577-2500 FAX:(8863)577-2510 9
! PHYSICAL DIM ENSIONS
" 8 LEAD P LASTIC S O (unit: m m)
SYMBOL MIN MAX
A 1.35 1.75
A1 0.10 0.25
B 0.33 0.51
C 0.19 0.25
D 4.80 5.00
E 3.80 4.00
e 1.27(TYP)
H 5.80 6.20
L 0.40 1.27
D
H
e
A
B
A1
C
E
L
" 8 LEAD PLASTIC DIP (unit: mm)
SYMBOL MIN MAX
A1 0.381 —
A2 2.92 4.96
b 0.35 0.56
C 0.20 0.36
D 9.01 10.16
E 7.62 8.26
E1 6.09 7.12
e 2.54 (TYP)
eB — 10.92
be
L
A2
A1
eB
E
C
E1
D
L 2.92 3.81
