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www.fairchildsemi.com
KA34063A
SMPS Controller
Features
Operation From 3.0 to 40V Input
Short Circuit Current Limiting
Low Standby 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, driver and 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
1
8-SOP
1
Internal Block Diagram
Rev. 1.0.1
©2001 Fairchild Semiconductor Corporation
KA34063A
Absolute Maximum Ratings
Parameter
Supply Voltage
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage
Switch Collector To Emitter Voltage
Driver Collector Voltage
Switch Current
Storage Temperature Renge
Symbol
V
CC
V
I(COMP)
V
C(SW)
V
E(SW)
V
CE(SW)
V
C(DR)
I
SW
T
STG
Value
40
- 0.3 ~ + 40
40
40
40
40
1.5
- 65 ~ + 150
Unit
V
V
V
V
V
V
A
°C
Electrical Characteristics
(V
CC
= 5.0V, T
A
= 0°C to +70°C , unless otherwise specified)
Parameter
OSCILLATOR
Charging Current
Discharging Current
Oscillator Amplitude
Discharge To Charge
Current Ratio
Current Limit Sense
Voltage
OUTPUT SWITCH
Saturation Voltage 1 (Note)
Saturation Voltage 2 (Note)
DC Current Gain (Note)
Collector off State Current (Note)
COMPARATOR
Threshold Voltage
Threshold Voltage Line Regulation
Input Bias Current
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
-
V
TH
∆V
TH
I
BIAS
V
I
= 0V
-
V
CC
= 3 to 40V
1.21
-
-
1.24
2.0
50
1.29
5.0
400
V
mV
nA
V
CE(SAT)
1
V
CE(SAT)
2
G
I(DC)
I
C(OFF)
I
SW
= 1.0A
V
C
(driver) = V
C
(SW)
I
SW
= 1.0A,
V
C
(driver) = 50mA
I
SW
= 1.0A,
V
CE
= 5.0V, T
A
= 25°C
V
CE
= 40V, T
A
= 25°C
-
-
50
-
0.95
0.45
180
0.01
1.3
0.7
-
100
V
V
-
µA
I
CHG
I
DISCHG
V
(OSC)
K
V
SENSE(C.L)
V
CC
= 5 to 40V
T
A
= 25°C
V
CC
= 5 to 40V
T
A
= 25°C
T
A
= 25°C
V
7
= V
CC
T
A
= 25°C
I
CHG
= I
DISCHG
T
A
= 25°C
5.2
250
22
140
31
190
0.5
6.1
300
42
260
-
7.5
350
µA
µA
V
-
mV
Symbol
Conditions
Min.
Typ. Max.
Unit
2.7
4.0
mA
Note :
Output switch tests are performed under pulsed conditions to minimize power dissipation
2
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