SLLS636D DECEMBER 2004 REVISED MARCH 2005
MC33063A, MC34063A
1.5 A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Wide Input Voltage Range . . . 3 V to 40 V
D
High Output Switch Current . . . Up to 1.5 A
D
Adjustable Output Voltage
D
Oscillator Frequency . . . Up to 100 kHz
D
Precision Internal Reference . . . 2%
D
Short-Circuit Current Limiting
D
Low Standby Current
1
2
3
4
8
7
6
5
Switch Collector
Switch Emitter
Timing Capacitor
GND
Driver Collector
I
pk
V
CC
Comparator Inverting Input
(TOP VIEW)
D (SOIC) OR P (PDIP) PACKAGE
DRJ (QFN) PACKAGE
(TOP VIEW)
Comparator Inverting Input
Switch Collector
2
3
4
1
8
7
6
5
Switch Emitter
Timing Capacitor
GND
V
CC
I
pk
Driver Collector
V
OUT
description/ordering information
The MC33063A and MC34063A are easy-to-use ICs containing all the primary circuitry needed for building
simple dc-dc converters. These devices primarily consist of an internal temperature-compensated reference,
a comparator, an oscillator, a PWM controller with active current limiting, a driver, and a high-current output
switch; thus, the devices require minimal external components to build converters in the boost, buck, and
inverting topologies.
The MC33063A is characterized for operation from -40
C to 85
C, while the MC34063A is characterized for
operation from 0
C to 70
C.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP (P)
Tube of 50
MC33063AP
MC33063AP
- 40
C to 85
C
QFN (DRJ)
Reel of 1000
MC33063ADRJR
PREVIEW
- 40
C to 85
C
SOIC (D)
Tube of 75
MC33063AD
M33063A
SOIC (D)
Reel of 2500
MC33063ADR
M33063A
PDIP (P)
Tube of 50
MC34063AP
MC34063AP
0
C to 70
C
QFN (DRJ)
Reel of 1000
MC34063ADRJR
PREVIEW
0
C to 70
C
SOIC (D)
Tube of 75
MC34063AD
M34063A
SOIC (D)
Reel of 2500
MC34063ADR
M34063A
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright
2005, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
MC33063A, MC34063A
1.5 A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
SLLS636D DECEMBER 2004 REVISED MARCH 2005
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional block diagram
_
+
Q
S
1.25-V
Reference
Regulator
R
CT
Ipk
Oscillator
Q2
Q1
Switch
Collector
4
Switch
Emitter
Timing
Capacitor
GND
3
2
1
8
7
6
5
Comparator
Inverting
Input
VCC
Ipk
Sense
Drive
Collector
100
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC
40 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comparator Inverting Input voltage range, V
IR
-0.3 V to 40 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch Collector voltage, V
C(switch)
40V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch Emitter voltage (V
PIN1
= 40 V), V
E(switch)
40V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch Collector to Switch Emitter voltage, V
CE(switch)
40V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Collector voltage, V
C(driver)
40V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Collector current, I
C(driver)
100
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch current, I
SW
1.5 A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Notes 1 and 2): D package
97
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
DRJ package
TBD
C/W
. . . . . . . . . . . . . . . . . . . . . . .
P package
85
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating virtual junction temperature, T
J
150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
-65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. Maximum power dissipation is a function of TJ(max),
JA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) - TA)/
JA. Operating at the absolute maximum TJ of 150
C can affect reliability.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
SLLS636D DECEMBER 2004 REVISED MARCH 2005
MC33063A, MC34063A
1.5 A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
MIN
MAX
UNIT
VCC
Supply voltage
3
40
V
TA
Operating free-air temperature range
MC33063A
-40
85
C
TA
Operating free-air temperature range
MC34063A
0
70
C
electrical characteristics, V
CC
= 5 V, T
A
= full operating range (unless otherwise noted) (see block
diagram)
OSCILLATOR
PARAMETER
TEST CONDITIONS
TA
MIN
TYP
MAX
UNIT
fosc
Oscillator frequency
VPIN5 = 0 V, CT = 1 nF
25
C
24
33
42
kHz
Ichg
Charge current
VCC = 5 V to 40 V
25
C
24
35
42
A
Idischg
Discharge current
VCC = 5 V to 40 V
25
C
140
220
260
A
Idischg/Ichg
Discharge-to-charge current ratio
VPIN7 = VCC
25
C
5.2
6.5
7.5
VIpk
Current-limit sense voltage
Idischg = Ichg
25
C
250
300
350
mV
OUTPUT SWITCH (see Note 3)
PARAMETER
TEST CONDITIONS
TA
MIN
TYP
MAX
UNIT
VCE(sat)
Saturation voltage Darlington
connection
ISW = 1 A, pins 1 and 8 connected
Full range
1
1.3
V
VCE(sat)
Saturation voltage non-Darlington
connection (see Note 4)
ISW = 1 A, RPIN8 = 82
to VCC,
forced
b
20
Full range
0.45
0.7
V
hFE
DC current gain
ISW = 1 A, VCE = 5 V
25
C
50
75
IC(off)
Collector off-state current
VCE = 40 V
Full range
0.01
100
A
NOTES:
3. Low duty-cycle pulse testing is used to maintain junction temperature as close to ambient temperature as possible.
4. In the non-Darlington configuration, if the output switch is driven into hard saturation at low switch currents (
300 mA) and high driver
currents (
30 mA), it may take up to 2
s for the switch to come out of saturation. This condition effectively shortens the off time at
frequencies
30 kHz, becoming magnified as temperature increases. The following output drive condition is recommended in the
non-Darlington configuration:
Forced
b
of output switch = IC,SW / (IC,driver - 7 mA)
10,
where
7 mA is required by the 100-
resistor in the emitter of the driver to forward bias the Vbe of the switch.
COMPARATOR
PARAMETER
TEST CONDITIONS
TA
MIN
TYP
MAX
UNIT
Vth
Threshold voltage
25
C
1.225
1.25
1.275
V
Vth
Threshold voltage
Full range
1.21
1.29
V
Vth
Threshold-voltage line regulation
VCC = 5 V to 40 V
Full range
1.4
5
mV
IIB
Input bias current
VIN = 0 V
Full range
-20
-400
nA
TOTAL DEVICE
PARAMETER
TEST CONDITIONS
TA
MIN
MAX
UNIT
ICC
Supply current
VCC = 5 V to 40 V, CT = 1 nF,
VPIN7 = VCC, VPIN5
>
Vth,
VPIN2 = GND, all other pins open
Full range
4
mA
MC33063A, MC34063A
1.5 A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
SLLS636D DECEMBER 2004 REVISED MARCH 2005
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
0.01
0.1
10
1
CT, Oscillator Timing Capacitor (nF)
t ON-OFF
, Output Switch
On-Off T
ime (
s)
1000
100
10
1
Figure 1. Output Switch On-Off Time vs
Oscillator Timing Capacitor
VCC = 5 V
Pin 7 = VCC
Pin 5 = GND
TA = 25
C
tON
tOFF
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Figure 2. Output Switch Saturation Voltage vs
Emitter Current (Emitter-Follower Configuration)
IE, Emitter Current (A)
V
CE(SA
T
), Output Switch
Saturation V
o
ltage (V)
VCC = 5 V
Pin 1, 7, 8 = VCC
Pin 3, 5 = GND
TA = 25
C
1
1
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Figure 3. Output Switch Saturation Voltage vs
Collector Current (Common-Emitter Configuration)
IC, Collector Current (A)
V
CE(SA
T
), Output Switch
Saturation V
o
ltage (V)
Darlington Connection
VCC = 5 V
Pin 7 = VCC
Pin 2, 3, 5 = GND
TA = 25
C
Force Beta = 20
0
0
1
200
220
240
260
280
300
320
340
360
380
-50
-25
0
25
50
75
100
125
TA, Ambient Temperature (
C)
V
IPK
, Current Limit
Sense V
oltage (mV)
Figure 4. Current-Limit Sense Voltage vs
Temperature
VCC = 5 V
ICHG = IDISCHG
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
0
5
10
15
20
25
30
35
40
VCC, Supply Voltage (V)
I CC
, Supply Current (mA)
Figure 5. Standby Supply Current vs
Supply Voltage
CT = 1 nF
Pin 7 = VCC
Pin 2 = GND
TA = 25
C
SLLS636D DECEMBER 2004 REVISED MARCH 2005
MC33063A, MC34063A
1.5 A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Q
S
R
CT
Ipk
Q2
Q1
2
1
CT
Comparator
_
+
1.25-V
Reference
Regulator
4
5
3
8
180
7
6
RSC
0.22
47 k
R2
L
170
H
CO
1N5819
330
F
1500 pF
R1
2.2 k
100
F
+
+
VCC
Vout
28 V/175 mA
1.0
H
100
F
+
Vout
Optional Filter
Vin
12 V
TEST
CONDITIONS
RESULTS
Line Regulation
VIN = 8 V to 16 V, IO = 175 mA
30 mV
0.05%
Load Regulation
VIN = 12 V, IO = 75 mA to 175 mA
10 mV
0.017%
Output Ripple
VIN = 12 V, IO = 175 mA
400 mVPP
Efficiency
VIN = 12 V, IO = 175 mA
87.7%
Output Ripple With Optional Filter
VIN = 12 V, IO = 175 mA
40 mVPP
Figure 6. Step-Up Converter
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