2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
Operation From 3.0 to 40V Input
Short Circuit Current Limiting
Low Stand-by Current
Output Switch Current of 1.5A Without External
Transistors
Output Voltage Adjustable
Frequency of Operation From 100Hz to 100kHz
Step-up, Step-Down or Inverting Switching Regulators
Description
The KA34063A is a monolithic regulator sub system
intended for use as DC to DC converter. This device
contains a temperature compensated bandgap reference, a
duty cycle control oscillator, a driver, and a high current
output switch. It can be used for step down, step up or
inverting switching regulators as well as for series pass
regulators.
8-DIP
8-SOP
1
1
Internal Block Diagram
5
1
8
2
7
3
4
COMP
OSCILLATOR
RD
Q2
Q1
S
Q
R
1.25V
REF
VTG
COMPARATOR
INVERTING
INPUT
DRIVE
COLLECTOR
SWITCH
COLLECTOR
GND
I
PK
SENSE
TIMING
CAPACITOR
* V
CC
(6)
KA34063A
SMPS Controller
KA34063A
2
Absolute Maximum Ratings
Electrical Characteristics
(V
CC
= 5.0V, T
A
= 0
C to +70
C
, unless otherwise specified)
Note :
1. Output switch tests are performed under pulsed conditions to minimize power dissipation.
2. These parameters, although guaranteed, are not 100% tested in production.
Parameter
Symbol
Value
Unit
Supply Voltage
V
CC
40
V
Comparator Input Voltage Range
V
I(COMP)
-0.3 ~ +40
V
Switch Collector Voltage
V
C(SW)
40
V
Switch Emitter Voltage
V
E(SW)
40
V
Switch Collector To Emitter Voltage
V
CE(SW)
40
V
Driver Collector Voltage
V
C(DR)
40
V
Switch Current
I
SW
1.5
A
Storage Temperature Range
T
STG
-65 ~ +150
C
Parameter
Symbol
Conditions
Min. Typ. Max. Unit
OSCILLATOR
Charging Current
I
CHG
V
CC
= 5 to 40V, T
A
= 25
C
22
31
42
A
Discharging Current
I
DISCHG
V
CC
= 5 to 40V, T
A
= 25
C
140
190
260
A
Oscillator Amplitude
V
(OSC)
T
A
= 25
C
0.5
-
V
Discharge to Charge Current Ratio
K
V
7
= V
CC,
T
A
= 25
C
5.2
6.1
7.5
-
Current Limit Sense Voltage
V
SENSE(C.L)
I
CHG
= I
DISCHG
T
A
= 25
C
250
300
350
mV
OUTPUT SWITCH
Saturation Voltage 1 (Note1)
V
CE(SAT)
1
I
SW
= 1.0A
V
C
(driver) = V
C
(SW)
-
0.95
1.3
V
Saturation Voltage 2 (Note1,2)
V
CE(SAT)
2
I
SW
= 1.0A,
V
C
(driver) = 50mA
-
0.45
0.7
V
DC Current Gain (Note1,2)
G
I(DC)
I
SW
= 1.0A,
V
CE
= 5.0V, T
A
= 25
C
50
180
-
-
Collector off State Current (Note1)
I
C(OFF)
V
CE
= 40V, T
A
= 25
C
-
0.01
100
A
COMPARATOR
Threshold Voltage
V
TH
-
1.21 1.24 1.29
V
Threshold Voltage Line Regulation
V
TH
V
CC
= 3 to 40V
-
2.0
5.0
mV
Input Bias Current
I
BIAS
V
I
= 0V
-
50
400
nA
TOTAL DEVICE
Supply Current
I
CC
V
CC
= 5 to 40V, C
T
= 0.001uF
V
7
= V
CC,
V
5
>V
TH
pin2 = GND
-
2.7
4.0
mA
KA34063A
3
Typical Performance Characteristics
Temperature (
C)
Figure 1. Temperature Drift (V
TH
)
KA34063A
4
Mechanical Dimensions
Package
Dimensions in millimeters
6.40
0.20
3.30
0.30
0.130
0.012
3.40
0.20
0.134
0.008
#1
#4
#5
#8
0.252
0.008
9.20
0.20
0.79
2.54
0.100
0.031
()
0.46
0.10
0.018
0.004
0.060
0.004
1.524
0.10
0.362
0.008
9.60
0.378
MAX
5.08
0.200
0.33
0.013
7.62
0~15
0.300
MAX
MIN
0.25
+0.10
0.05
0.010
+0.004
0.002
8-DIP
KA34063A
5
Mechanical Dimensions
(Continued)
Package
Dimensions in millimeters
4.92
0.20
0.194
0.008
0.41
0.10
0.016
0.004
1.27
0.050
5.72
0.225
1.55
0.20
0.061
0.008
0.1~0.25
0.004~0.001
6.00
0.30
0.236
0.012
3.95
0.20
0.156
0.008
0.50
0.20
0.020
0.008
5.13
0.202
MAX
#1
#4
#5
0~8
#8
0.56
0.022
()
1.80
0.071
MAX0.10
MAX0.004
MAX
MIN
+
0.10
-0.05
0.15
+
0.004
-0.002
0.006
8-SOP
KA34063A
9/10/02 0.0m 001
Stock#DSxxxxxxxx
2002 Fairchild Semiconductor Corporation
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
Ordering Information
Product Number
Package
Operating Temperature
KA34063A 8-DIP
0 ~ +70
C
KA34063AD
8-SOP
PDF 
ZIP