−
+
QS
1.25-V
Reference
Regulator
R
C
T
I
pk
Oscillator
Q2
Q1
Switch
Collector
4
Switch
Emitter
Timing
Capacitor
GND
3
2
18
7
6
5
Comparator
Inverting Input
V
CC
I
pk
Sense
Drive
Collector
100 W
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
MC3x063A 1.5-A Peak Boost/Buck/Inverting Switching Regulators
1 Features 3 Description
1
• Wide Input Voltage Range: 3 V to 40 V
• High Output Switch Current: Up to 1.5 A
• Adjustable Output Voltage
• Oscillator Frequency Up to 100 kHz
• Precision Internal Reference: 2%
• Short-Circuit Current Limiting
• Low Standby Current
2 Applications
• Blood Gas Analyzers: Portable
• Cable Solutions
• HMIs (Human Machine Interfaces)
• Telecommunications
• Portable Devices
• Consumer & Computing
• Test & Measurement
The MC33063A and MC34063A devices are easy-touse ICs containing all the primary circuitry needed for
building simple DC-DC converters. These devices
primarily consist of an internal temperaturecompensated 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 device is characterized for operation
from –40°C to 85°C, while the MC34063A device is
characterized for operation from 0°C to 70°C.
Device Information
PART NUMBER PACKAGE (PIN) BODY SIZE
MC3x063A SON (8) 4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
MC33063A,MC34063A
(1)
SOIC (8) 4.90 mm × 3.91 mm
PDIP (8) 9.81 mm × 6.35 mm
4 Simplified Schematic
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
www.ti.com
Table of Contents
1 Features.................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Simplified Schematic............................................. 1
5 Revision History..................................................... 2
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information.................................................. 4
7.5 Electrical Characteristics—Oscillator........................ 4
7.6 Electrical Characteristics—Output Switch................. 5
7.7 Electrical Characteristics—Comparator.................... 5
7.8 Electrical Characteristics—Total Device ................... 5
7.9 Typical Characteristics.............................................. 6
8 Detailed Description .............................................. 7
8.1 Overview................................................................... 7
8.2 Functional Block Diagram ......................................... 7
8.3 Feature Description................................................... 7
8.4 Device Functional Modes.......................................... 7
9 Application and Implementation .......................... 8
9.1 Application Information.............................................. 8
9.2 Typical Application.................................................... 9
10 Power Supply Recommendations..................... 17
11 Layout................................................................... 17
11.1 Layout Guidelines................................................. 17
11.2 Layout Example.................................................... 17
12 Device and Documentation Support................. 18
12.1 Related Links........................................................ 18
12.2 Trademarks........................................................... 18
12.3 Electrostatic Discharge Caution............................ 18
12.4 Glossary................................................................ 18
13 Mechanical, Packaging, and Orderable
Information........................................................... 18
5 Revision History
Changes from Revision M (January 2011) to Revision N Page
• Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table,
Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply
Recommendations section, Layout section, Device and Documentation Support section, and Mechanical,
Packaging, and Orderable Information section. ..................................................................................................................... 1
• Deleted Ordering Information table. ....................................................................................................................................... 1
2 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated
Product Folder Links: MC33063A MC34063A
1
2
3
4
8
7
6
5
Switch Collector
Switch Emitter
Timing Capacitor
GND
Driver Collector
I
pk
V
CC
Comparator Inverting Input
D (SOIC) OR P (PDIP) PACKAGE
(TOP VIEW)
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
†
The exposed thermal pad is electrically bonded internally to pin 4 (GND) .
†
www.ti.com
6 Pin Configuration and Functions
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
NAME NO.
Switch Collector 1 I/O High-current internal switch collector input.
Switch Emitter 2 I/O High-current internal switch emitter output.
Timing Capacitor 3 — Attach a timing capacitor to change the switching frequency.
GND 4 — Ground
Comparator
Inverting Input
V
CC
I
PK
Driver Collector 8 I/O Darlington pair driving transistor collector input.
PIN
Pin Functions
TYPE DESCRIPTION
5 I Attach to a resistor divider network to create a feedback loop.
6 I Logic supply voltage. Tie to VIN.
7 I Current-limit sense input.
Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: MC33063A MC34063A
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
www.ti.com
7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
V
CC
V
IR
V
C(switch)
V
E(switch)
V
CE(switch)
V
C(driver)
I
C(driver)
I
SW
T
J
T
stg
(1) 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.
Supply voltage 40 V
Comparator inverting input voltage range –0.3 40 V
Switch collector voltage 40 V
Switch emitter voltage V
Switch collector to switch emitter voltage 40 V
Driver collector voltage 40 V
Driver collector current 100 mA
Switch current 1.5 A
Operating virtual junction temperature 150 °C
Storage temperature range –65 150 °C
7.2 ESD Ratings
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins
V
(ESD)
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
Electrostatic discharge V
Charged device model (CDM), per JEDEC specification JESD22-C101,
(2)
all pins
(1)
MIN MAX UNIT
= 40 V 40 V
PIN1
VALUE UNIT
(1)
2500
1500
7.3 Recommended Operating Conditions
MIN MAX UNIT
V
Supply voltage 3 40 V
CC
T
Operating free-air temperature °C
A
MC33063A –40 85
MC34063A 0 70
7.4 Thermal Information
MC33063A
THERMAL METRIC
(1)
D DRJ P UNIT
8 PINS
R
θJA
Junction-to-ambient thermal resistance 97 41 85 °C/W
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report (SPRA953).
7.5 Electrical Characteristics—Oscillator
VCC= 5 V, TA= full operating range (unless otherwise noted) (see block diagram)
f
osc
I
chg
I
dischg
I
dischg/Ichg
V
Ipk
PARAMETER TEST CONDITIONS T
Oscillator frequency V
= 0 V, CT= 1 nF 25°C 24 33 42 kHz
PIN5
A
Charge current VCC= 5 V to 40 V 25°C 24 35 42 μA
Discharge current VCC= 5 V to 40 V 25°C 140 220 260 μA
Discharge-to-charge current ratio V
Current-limit sense voltage I
PIN7
dischg
= V
= I
chg
CC
25°C 5.2 6.5 7.5 —
25°C 250 300 350 mV
MIN TYP MAX UNIT
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Product Folder Links: MC33063A MC34063A
MC33063A,MC34063A
www.ti.com
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
7.6 Electrical Characteristics—Output Switch
VCC= 5 V, TA= full operating range (unless otherwise noted) (see block diagram)
PARAMETER TEST CONDITIONS T
V
CE(sat)
V
CE(sat)
h
FE
I
C(off)
(1) Low duty-cycle pulse testing is used to maintain junction temperature as close to ambient temperature as possible.
(2) In the non-Darlington configuration, if the output switch is driven into hard saturation at low switch currents (≤300 mA) and high driver
Saturation voltage –
Darlington connection
Saturation voltage – ISW= 1 A, R
non-Darlington connection
ISW= 1 A, pins 1 and 8 connected Full range 1 1.3 V
= 82 Ω to VCC,
(2)
forced β ∼ 20
PIN8
DC current gain ISW= 1 A, VCE= 5 V 25°C 50 75 —
Collector off-state current VCE= 40 V Full range 0.01 100 μA
currents (≥30 mA), it may take up to 2 μs 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 nonDarlington configuration:
Forced β of output switch = I
forward bias the Vbeof the switch.
C,SW
/ (I
– 7 mA) ≥ 10, where ∼7 mA is required by the 100-Ω resistor in the emitter of the driver to
C,driver
(1)
A
MIN TYP MAX UNIT
Full range 0.45 0.7 V
7.7 Electrical Characteristics—Comparator
VCC= 5 V, TA= full operating range (unless otherwise noted) (see block diagram)
V
ΔV
I
IB
PARAMETER TEST CONDITIONS T
th
th
Threshold voltage V
Threshold-voltage line regulation VCC= 5 V to 40 V Full range 1.4 5 mV
A
25°C 1.225 1.25 1.275
Full range 1.21 1.29
Input bias current VIN= 0 V Full range –20 –400 nA
MIN TYP MAX UNIT
7.8 Electrical Characteristics—Total Device
VCC= 5 V, TA= full operating range (unless otherwise noted) (see block diagram)
PARAMETER TEST CONDITIONS T
I
CC
Supply current V
VCC= 5 V to 40 V, CT= 1 nF,
= VCC, V
PIN7
V
= GND, All other pins open
PIN2
> Vth, Full range 4 mA
PIN5
A
MIN MAX UNIT
Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: MC33063A MC34063A
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
IC, Collector Current (A)
V
CE(SAT)
, Output Switch
Saturation V
oltage (V)
Darlington Connection
VCC= 5 V
Pin 7 = V
CC
Pin 2, 3, 5 = GND
TA= 25°C
Force Beta = 20
0
0 1
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)
CT= 1 nF
Pin 7 = V
CC
Pin 2 = GND
TA= 25°C
1
10
100
1000
0.01 0.1 1 10
CT, Oscillator Timing Capacitor (nF)
t
ON-OFF
, Output Switch
On-Off Time (µs)
VCC= 5 V
Pin 7 = V
CC
Pin 5 = GND
TA= 25°C
t
ON
t
OFF
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
IE, Emitter Current (A)
V
CE(SAT)
, Output Switch
Saturation V
oltage (V)
VCC= 5 V
Pin 1, 7, 8 = V
CC
Pin 3, 5 = GND
TA= 25°C
1
10
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
7.9 Typical Characteristics
www.ti.com
Figure 1. Output Switch On-Off Time vs
Oscillator Timing Capacitor
Figure 3. Output Switch Saturation Voltage vs
Collector Current (Common-Emitter Configuration)
Figure 2. Output Switch Saturation Voltage vs
Emitter Current (Emitter-Follower Configuration)
Figure 4. Standby Supply Current vs Supply Voltage
6 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated
Product Folder Links: MC33063A MC34063A
−
+
QS
1.25-V
Reference
Regulator
R
C
T
I
pk
Oscillator
Q2
Q1
Switch
Collector
4
Switch
Emitter
Timing
Capacitor
GND
3
2
18
7
6
5
Comparator
Inverting Input
V
CC
I
pk
Sense
Drive
Collector
100 W
MC33063A,MC34063A
www.ti.com
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
8 Detailed Description
8.1 Overview
The MC33063A and MC34063A devices 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 device is characterized for operation from –40°C to 85°C, while the MC34063A device is
characterized for operation from 0°C to 70°C.
8.2 Functional Block Diagram
8.3 Feature Description
• Wide Input Voltage Range: 3 V to 40 V
• High Output Switch Current: Up to 1.5 A
• Adjustable Output Voltage
• Oscillator Frequency Up to 100 kHz
• Precision Internal Reference: 2%
• Short-Circuit Current Limiting
• Low Standby Current
8.4 Device Functional Modes
8.4.1 Standard operation
Based on the application, the device can be configured in multiple different topologies. See the Application and
Implementation section for how to configure the device in several different operating modes.
Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 7
Product Folder Links: MC33063A MC34063A
8
7
6
1
2
R*
* R 0 for constant V
in
8
7
6
1
2
V
OUT
R
SC
V
IN
R
SC
V
IN
V
OUT
a) EXTERNAL npn SWITCH b) EXTERNAL npn SATURATED SWITCH (see Note A)
7
→
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
9.1.1 External Switch Configurations for Higher Peak Current
www.ti.com
A. If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (≤300 mA) and
high driver currents (≥30 mA), it may take up to 2 μs to come out of saturation. This condition will shorten the off time
at frequencies ≥30 kHz and is magnified at high temperatures. This condition does not occur with a Darlington
configuration because the output switch cannot saturate. If a non-Darlington configuration is used, the output drive
configuration in Figure 7b is recommended.
Figure 5. Boost Regulator Connections for ICPeak Greater Than 1.5 A
8 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated
Product Folder Links: MC33063A MC34063A
QS
R
C
T
I
pk
Q2
Q1
2
1
Oscillator
_
+
1.25-V
Reference
Regulator
4
5
3
8
7
6
R
SC
0.24 W
953 W
R1
C
O
1N5819
1500 pF
R2
8.2 kW
100 mF
+
V
CC
V
OUT
−12 V/100 mA
1.0 mH
100 mF
Optional Filter
V
IN
4.5 V to 6.0 V
+
+
1000 mF
+
L
88 mH
Comparator
V
OUT
= –1.25 (1+
R2
R1
)
V
IN
V
OUT
V
IN
V
OUT
8
7
6
4
3
2
1
8
7
6
4
3
2
1
5
5
a) External NPN Switch b) External PNP Saturated Switch
V
IN
8
7
6
1
2
8
7
6
1
2
R
SC
V
IN
R
SC
V
OUT
V
OUT
a) EXTERNAL npn SWITCH b) EXTERNAL pnp SATURATED SWITCH
www.ti.com
Application Information (continued)
Figure 6. Buck Regulator Connections for ICPeak Greater Than 1.5 A
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
Figure 7. Inverting Regulator Connections for ICPeak Greater Than 1.5 A
9.2 Typical Application
9.2.1 Voltage-Inverting Converter Application
Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Links: MC33063A MC34063A
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
Typical Application (continued)
Figure 8. Voltage-Inverting Converter
www.ti.com
10 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated
Product Folder Links: MC33063A MC34063A
R2
1.25 1
R1
æ ö
- +
ç ÷
è ø
( )
out on
ripple pp
I t
9
V
( )
( )
( )
( )
sat
in min
on max
pk switch
V V
t
I
æ ö
-
ç ÷
ç ÷
ç ÷
è ø
( )
pk switch
0.3
I
( )
on
out m ax
off
t
2I 1
t
æ ö
+
ç ÷
è ø
5
on
4 10 t
-
´
( )
on off off
t t t+ -
on off
on
off
t t
t
1
t
+
+
1
out F
in sat
V V
V V+-
MC33063A,MC34063A
www.ti.com
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
Typical Application (continued)
9.2.1.1 Design Requirements
The user must determine the following desired parameters:
V
= Saturation voltage of the output switch
sat
VF= Forward voltage drop of the chosen output rectifier
The following power-supply parameters are set by the user:
Vin= Nominal input voltage
V
= Desired output voltage
out
I
= Desired output current
out
f
= Minimum desired output switching frequency at the selected values of Vinand I
min
V
= Desired peak-to-peak output ripple voltage. The ripple voltage directly affects the line and load
ripple
regulation and, thus, must be considered. In practice, the actual capacitor value should be larger than the
calculated value, to account for the capacitor's equivalent series resistance and board layout.
9.2.1.2 Detailed Design Procedure
CALCULATION VOLTAGE INVERTING
ton/t
off
out
(ton+ t
t
off
t
on
C
I
pk(switch)
R
L
(min)
C
V
SC
out
)
off
T
O
See Figure 8
Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 11
Product Folder Links: MC33063A MC34063A
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)
VCC= 5 V
I
CHG
= I
DISCHG
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
9.2.1.3 Application Performance
Figure 9. Current-Limit Sense Voltage vs Temperature
TEST CONDITIONS RESULTS
Line regulation VIN= 4.5 V to 6 V, IO= 100 mA 3 mV ± 0.12%
Load regulation VIN= 5 V, IO= 10 mA to 100 mA 0.022 V ± 0.09%
Output ripple VIN= 5 V, IO= 100 mA 500 mV
Short-circuit current VIN= 5 V, RL= 0.1 Ω 910 mA
Efficiency VIN= 5 V, IO= 100 mA 62.2%
Output ripple with optional filter VIN= 5 V, IO= 100 mA 70 mV
PP
PP
www.ti.com
12 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated
Product Folder Links: MC33063A MC34063A
QS
R
C
T
I
pk
Q2
Q1
2
1
C
T
Comparator
_
+
1.25-V
Reference
Regulator
4
5
3
8
180 W
7
6
R
SC
0.22 W
47 kW
R2
L
170 mH
C
O
1N5819
330 mF
1500 pF
R1
2.2 kW
100 mF
+
+
V
CC
V
OUT
28 V/175 mA
1.0 mH
100 mF
+
Optional Filter
V
IN
12 V
V
OUT
= 1.25 (1+
R2
R1
)
www.ti.com
9.2.2 Step-Up Converter Application
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
Figure 10. Step-Up Converter
9.2.2.1 Design Requirements
The user must determine the following desired parameters:
V
= Saturation voltage of the output switch
sat
VF= Forward voltage drop of the chosen output rectifier
The following power-supply parameters are set by the user:
Vin= Nominal input voltage
V
= Desired output voltage
out
I
= Desired output current
out
f
= Minimum desired output switching frequency at the selected values of Vinand I
min
V
= Desired peak-to-peak output ripple voltage. The ripple voltage directly affects the line and load
ripple
regulation and, thus, must be considered. In practice, the actual capacitor value should be larger than the
out
calculated value, to account for the capacitor's equivalent series resistance and board layout.
Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 13
Product Folder Links: MC33063A MC34063A
R2
R1
æ ö
+
ç ÷
è ø
( )
out on
ripple pp
I t
9
V
( )
( )
( )
( )
sat
in min
on max
pk switch
V V
t
I
æ ö
-
ç ÷
ç ÷
ç ÷
è ø
( )
pk switch
0.3
I
( )
on
out m ax
off
t
2I 1
t
æ ö
+
ç ÷
è ø
5
on
4 10 t
-
´
on off off
t t t+ -
on off
on
off
t t
t
1
t
+
+
1
( )
( )
out
F Vin min
sat
in m in
V V
V V
-
+
-
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
9.2.2.2 Detailed Design Procedure
CALCULATION STEP UP
ton/t
off
www.ti.com
(ton+ t
t
off
t
on
C
I
pk(switch)
R
L
(min)
C
V
out
SC
)
off
T
O
See Figure 10
9.2.2.3 Application Performance
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 mV
Efficiency VIN= 12 V, IO= 175 mA 87.7%
Output ripple with optional filter VIN= 12 V, IO= 175 mA 40 mV
14 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated
TEST CONDITIONS RESULTS
PP
PP
Product Folder Links: MC33063A MC34063A
QS
R
C
T
I
pk
Q2
Q1
2
1
C
T
Oscillator
_
+
1.25-V
Reference
Regulator
4
5
3
8
7
6
R
SC
0.33 W
3.8 kW
R2
L
220 mH
C
O
1N5819
470 mF
470 pF
R1
1.2 kW
100 mF
+
+
V
CC
V
OUT
5 V/500 mA
1.0 mH
100 mF
+
Optional Filter
V
IN
25 V
Comparator
V
OUT
= 1.25 (1+
R2
R1
)
www.ti.com
9.2.3 Step-Down Converter Application
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
Figure 11. Step-Down Converter
9.2.3.1 Design Requirements
The user must determine the following desired parameters:
V
= Saturation voltage of the output switch
sat
VF= Forward voltage drop of the chosen output rectifier
The following power-supply parameters are set by the user:
Vin= Nominal input voltage
V
= Desired output voltage
out
I
= Desired output current
out
f
= Minimum desired output switching frequency at the selected values of Vinand I
min
V
= Desired peak-to-peak output ripple voltage. The ripple voltage directly affects the line and load
ripple
regulation and, thus, must be considered. In practice, the actual capacitor value should be larger than the
calculated value, to account for the capacitor's equivalent series resistance and board layout.
out
Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 15
Product Folder Links: MC33063A MC34063A
R2
R1
æ ö
+
ç ÷
è ø
( )
( )
( )
pk on off
switch
ripple pp
I t t8V+
( )
( )
( )
( )
sat out
in min
on max
pk switch
V V V
t
I
æ ö
- -
ç ÷
ç ÷
ç ÷
è ø
( )
pk switch
0.3
I
( )
out m ax
2I
5
on
4 10 t
-
´
on off off
t t t+ -
on off
on
off
t t
t
1
t
+
+
1
( )
out F
sat ou t
in m in
V V
V V V
+
- -
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
9.2.3.2 Detailed Design Procedure
CALCULATION STEP DOWN
ton/t
off
www.ti.com
(ton+ t
t
off
t
on
C
I
pk(switch)
R
L
(min)
C
V
out
SC
)
off
T
O
See Figure 11
9.2.3.3 Application Performance
Line regulation VIN= 15 V to 25 V, IO= 500 mA 12 mV ± 0.12%
Load regulation VIN= 25 V, IO= 50 mA to 500 mA 3 mV ± 0.03%
Output ripple VIN= 25 V, IO= 500 mA 120 mV
Short-circuit current VIN= 25 V, RL= 0.1 Ω 1.1 A
Efficiency VIN= 25 V, IO= 500 mA 83.7%
Output ripple with optional filter VIN= 25 V, IO= 500 mA 40 mV
16 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated
TEST CONDITIONS RESULTS
PP
PP
Product Folder Links: MC33063A MC34063A
MC33063A
1
2
3
4
8
7
6
5
0.33
R1
VIN
100 PF
C
T
C
O
R2
VOUT
MC33063A,MC34063A
www.ti.com
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
10 Power Supply Recommendations
This device accepts 3 V to 40 V on the input. It is recommended to have a 1000-µF decoupling capacitor on the
input.
11 Layout
11.1 Layout Guidelines
Keep feedback loop layout trace lengths to a minimum to avoid unnecessary IR drop. In addition, the loop for the
decoupling capacitor at the input should be as small as possible. The trace from VINto pin 1 of the device should
be thicker to handle the higher current.
11.2 Layout Example
Figure 12. Layout Example for a Step-Down Converter
Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 17
Product Folder Links: MC33063A MC34063A
MC33063A,MC34063A
SLLS636N –DECEMBER 2004–REVISED JANUARY 2015
www.ti.com
12 Device and Documentation Support
12.1 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 1. Related Links
PARTS PRODUCT FOLDER SAMPLE & BUY
MC33063A Click here Click here Click here Click here Click here
MC34063A Click here Click here Click here Click here Click here
12.2 Trademarks
All trademarks are the property of their respective owners.
12.3 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.4 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
TECHNICAL TOOLS & SUPPORT &
DOCUMENTS SOFTWARE COMMUNITY
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
18 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated
Product Folder Links: MC33063A MC34063A
PACKAGE OPTION ADDENDUM
www.ti.com
PACKAGING INFORMATION
Orderable Device Status
MC33063AD ACTIVE SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 M33063A
MC33063ADE4 ACTIVE SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 M33063A
MC33063ADG4 ACTIVE SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 M33063A
MC33063ADR ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 M33063A
MC33063ADRE4 ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 M33063A
MC33063ADRG4 ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 M33063A
MC33063ADRJR ACTIVE SON DRJ 8 1000 RoHS & Green NIPDAU Level-3-260C-168 HR -40 to 85 ZYF
MC33063AP ACTIVE PDIP P 8 50 RoHS & Green NIPDAU N / A for Pkg Type -40 to 85 MC33063AP
MC33063APE4 ACTIVE PDIP P 8 50 RoHS & Green NIPDAU N / A for Pkg Type -40 to 85 MC33063AP
MC34063AD ACTIVE SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 M34063A
Package Type Package
(1)
Drawing
Pins Package
Qty
Eco Plan
(2)
Lead finish/
Ball material
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
14-Aug-2021
Samples
(4/5)
MC34063ADE4 ACTIVE SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 M34063A
MC34063ADG4 ACTIVE SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 M34063A
MC34063ADR ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 M34063A
MC34063ADRJR ACTIVE SON DRJ 8 1000 RoHS & Green NIPDAU Level-3-260C-168 HR 0 to 70 ZYF
MC34063ADRJRG4 ACTIVE SON DRJ 8 1000 RoHS & Green NIPDAU Level-3-260C-168 HR 0 to 70 ZYF
MC34063AP ACTIVE PDIP P 8 50 RoHS & Green NIPDAU N / A for Pkg Type 0 to 70 MC34063AP
MC34063APE4 ACTIVE PDIP P 8 50 RoHS & Green NIPDAU N / A for Pkg Type 0 to 70 MC34063AP
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
OBSOLETE: TI has discontinued the production of the device.
14-Aug-2021
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF MC33063A :
Automotive : MC33063A-Q1
•
NOTE: Qualified Version Definitions:
Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects
•
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com 3-Aug-2021
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type
MC33063ADR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
MC33063ADR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
MC33063ADRJR SON DRJ 8 1000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2
MC34063ADR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
MC34063ADRJR SON DRJ 8 1000 180.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2
Package
Drawing
Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm)B0(mm)K0(mm)P1(mm)W(mm)
Pin1
Quadrant
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com 3-Aug-2021
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
MC33063ADR SOIC D 8 2500 340.5 336.1 25.0
MC33063ADR SOIC D 8 2500 367.0 367.0 35.0
MC33063ADRJR SON DRJ 8 1000 367.0 367.0 35.0
MC34063ADR SOIC D 8 2500 340.5 336.1 25.0
MC34063ADRJR SON DRJ 8 1000 210.0 185.0 35.0
Pack Materials-Page 2
PACKAGE OUTLINE
A
.189-.197
[4.81-5.00]
NOTE 3
.228-.244 TYP
[5.80-6.19]
1
4
B .150-.157
[3.81-3.98]
PIN 1 ID AREA
NOTE 4
SCALE 2.800
6X .050
[1.27]
8
2X
.150
[3.81]
5
8X .012-.020
[0.31-0.51]
.010 [0.25] C A B
SOIC - 1.75 mm max heightD0008A
SMALL OUTLINE INTEGRATED CIRCUIT
C
SEATING PLANE
.004 [0.1] C
4X (0 -15 )
.069 MAX
[1.75]
.005-.010 TYP
[0.13-0.25]
4X (0 -15 )
SEE DETAIL A
.010
[0.25]
0 - 8
.016-.050
[0.41-1.27]
(.041)
[1.04]
DETAIL A
TYPICAL
.004-.010
[0.11-0.25]
4214825/C 02/2019
NOTES:
1. Linear dimensions are in inches [millimeters]. Dimensions in parenthesis are for reference only. Controlling dimensions are in inches.
Dimensioning and tolerancing per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. This dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not
exceed .006 [0.15] per side.
4. This dimension does not include interlead flash.
5. Reference JEDEC registration MS-012, variation AA.
www.ti.com
8X (.061 )
8X (.024)
6X (.050 )
[1.27]
[0.6]
[1.55]
SYMM
1
4
(.213)
[5.4]
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE:8X
EXAMPLE BOARD LAYOUT
SOIC - 1.75 mm max heightD0008A
SMALL OUTLINE INTEGRATED CIRCUIT
SEE
DETAILS
8
SYMM
(R.002 ) TYP
5
[0.05]
EXPOSED
METAL
METAL
NON SOLDER MASK
SOLDER MASK
OPENING
.0028 MAX
[0.07]
ALL AROUND
DEFINED
SOLDER MASK
OPENING
EXPOSED
METAL
.0028 MIN
[0.07]
ALL AROUND
SOLDER MASK
DEFINED
SOLDER MASK DETAILS
NOTES: (continued)
6. Publication IPC-7351 may have alternate designs.
7. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
METAL UNDER
SOLDER MASK
4214825/C 02/2019
www.ti.com
8X (.061 )
8X (.024)
[0.6]
6X (.050 )
[1.27]
[1.55]
EXAMPLE STENCIL DESIGN
SOIC - 1.75 mm max heightD0008A
SMALL OUTLINE INTEGRATED CIRCUIT
SYMM
1
8
SYMM
(R.002 ) TYP
4
(.213)
[5.4]
5
[0.05]
BASED ON .005 INCH [0.125 MM] THICK STENCIL
NOTES: (continued)
8. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
9. Board assembly site may have different recommendations for stencil design.
SCALE:8X
4214825/C 02/2019
SOLDER PASTE EXAMPLE
www.ti.com
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