SEMICONDUCTOR
TECHNICAL DATA
150kHz 3A Step-Down DC/DC Converter.
The KIA2596 series are monolithic IC that design for a step-down
DC/DC converter,and own the ability of driving a 3A load without
additional transistor component. Due to reducing the number of
external component, the board space can be saved easily.
The external shutdown function can be controlled by logic level and
then come into standby mode.
The internal compensation makes feedback control have good line
and load regulation without external design. Regarding protected
function,thermal shutdown is to prevent over temperature operating
from damage, and current limit is against over current operating of the
output switch. The KIA2596 series operates at a switching frequency
of 150kHz thus allowing smaller sized filter components than what
would be needed with lower frequency switching regulators.
FEATURES
Output voltage : 3.3V, 5V, 12V and adjustable output version.
Adjustable version output voltage range, 1.23V to 37V
150k
fixed switching frequency.
Voltage mode non-synchronous PWM control.
Thermal-shutdown and current-limit protection.
ON/OFF shutdown control input.
Operating voltage can be up to 40V.
Output load current. : 3A
TO-220-5 and D
2
PAK-5 packages.
Low power standby mode.
B
E
A
KIA2596FP/PI00 ~
KIA2596FP/PI12
BIPOLAR LINEAR INTEGRATED CIRCUIT
A
I
J
N
R
M
O
G
F
L
C
DIM
A
B
C
D
E
F
G
I
J
K
L
M
N
O
Q
R
MILLIMETERS
_
9.8 + 0.2
_
8.8 + 0.2
8.0
_
15 + 0.3
_
5.0 + 0.2
_
1.7 + 0.1
_
0.8 + 0.1
_
4.0 + 0.2
_ 0.13
1.27 +
6.7
_
0.5 + 0.15
0~0.25
_
1.27 + 0.1
_
2.3 + 0.3
7.85
0~0.15
D
E
B
K Q
1
2
3
4
5
Heat Sink is common
to
3
GND
D
2
PAK-5
G
H
C
P
APPLICATION
Simple High-efficiency step-down regulator.
On-card switching regulators.
Positive to negative converter.
F
D
I
L
DIM
A
B
C
D
E
F
G
H
I
J
K
L
M
K
J
LINE UP
ITEM
KIA2596FP/PI00
KIA2596FP/PI33
KIA2596FP/PI50
KIA2596FP/PI12
OUTPUT VOLTAGE (V)
Adjustable (1.23~37V)
3.3
5.0
12.0
1
2
3
4
5
PACKAGE
M
N
O
P
MILLIMETERS
_
10 + 0.2
_
24.6 + 0.2
_
3.5 + 0.1
_ 0.1
0.8 +
_
3.2 + 0.2
1.7
_
4.5 + 0.2
_
2.8 + 0.2
0.5
_
3.2 + 0.5
_
8.2 + 0.7
1.5
5.0
2.0
_
5.0 + 0.5
_ 0.5
16.5 +
FP : D PAK-5
2
PI : TO-220IS-5
TO-220IS-5
2006. 7. 6
Revision No : 2
N
O
1/6
KIA2596FP/PI00 ~ KIA2596FP/PI12
CONNECTION (TOPVIEW)
D
2
PAK-5 package
5 - ON/OFF
4 - Feed Back
3 - Ground
2 - Output
1 - Input
TO-220IS-5 package
5 - ON/OFF
4 - Feed Back
3 - Ground
2 - Output
1 - Input
APPLICATION CIRCUIT
(1) Fixed Type Circuit
4
V
IN
= 12V
1
V
IN
C
IN
680µF
5
ON/OFF
3
GND
D1
SMAB33
C
O
220µF
FB
L1
33uH
V
OUT
= 3.3V/3A
KIA2596FP33
2
Output
[ON/OFF control function]
GND : Output ON
High : Output OFF
(2) Adjustable Type Circuit
R1
FB
4
V
IN
= 12V
1
V
IN
C
IN
680µF
5
ON/OFF
3
GND
D1
SMAB33
C
O
220µF
Output
L1
33µH
V
OUT
= 3.3V/3A
R2
KIA2596FP00
2
[ON/OFF control function]
GND : Output ON
High : Output OFF
V
OUT
= V
FB
V
FB
= 1.23V
R
2
= 1kΩ∼3kΩ
R
1
< 1kΩ
(1 +
R2
)
R1
2006. 7. 6
Revision No : 2
2/6
KIA2596FP/PI00 ~ KIA2596FP/PI12
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTIC
Supply Voltage
ON/OFF Pin input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation 1
Power Dissipation 2
Storage Temperature
Operating Temperature
Operating Voltage
PI
FP
PI
FP
SYMBOL
V
IN
V
ON/OFF
V
FB
V
OUT
P
D1
P
D2
T
stg
T
opr
V
opr
RATING
45
-0.3 ~ +25
-0.3 ~ +25
-1
1.5
2.0
15
35
-65 ~ +150
-40 ~ +125
+5 ~ +40
V
UNIT
V
V
V
V
W
W
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, V
IN
=12V for 3.3V, 5V, adjustable version and V
IN
=24V for the 12V version. I
LOAD
= 0.5A
CHARACTERISTIC
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max. Duty Cycle (ON)
Max. Duty Cycle (OFF)
Current Limit
Output = 0
Output = -1
Quiescent Current
Standby Quiescent Current
ON/OFF pin Logic Input
Threshold Voltage
ON/OFF Pin Logic Input Current
ON/OFF Pin Input Current
Output Leakage
Current
SYMBOL
I
FB
F
OSC
V
SAT
DC
I
limit
I
L
I
Q
I
STBY
V
IL
V
IH
I
H
I
L
TEST CONDITION
V
FB
=1.3V (Adjustable version only)
-
I
OUT
=3A, no outside circuit
V
FB
=0V force driver on
V
FB
=0V force driver on
V
FB
=12V force driver off
peak current no outside circuit
V
FB
=0V force driver on
no outside circuit, V
FB
=12V force driver off
V
IN
=40V
V
FB
=12V force driver off
ON/OFF pin=5V V
IN
=40V
Low (regulator ON)
High (regulator OFF)
V
LOGIC
=2.5V (OFF)
V
LOGIC
=0.5V (ON)
MIN.
-
127
-
-
-
3.6
-
-
-
-
-
2.0
-
-
TYP.
40
150
1.3
100
0
4.5
-
2
5
300
1.3
5
0.02
MAX.
60
100
173
1.4
1.5
-
-
6.9
50
30
10
500
600
0.6
-
15
5
UNIT
nA
kHz
V
%
A
A
mA
mA
A
V
A
ELECTRICAL CHARACTERISTICS
CHARACTERISTIC
Output Feedback
Efficiency
Output Voltage
Efficiency
Output Voltage
Efficiency
Output Voltage
Efficiency
KIA2596FP/PI12
V
OUT
KIA2596FP/PI50
V
OUT
KIA2596FP/PI33
V
OUT
KIA2596FP/PI00
SYMBOL
V
FB
TEST CONDITION
5V<V
IN
<40V, 0.2A I
LOAD
3A
V
OUT
programmed for 3V
V
IN
= 12V, I
LOAD
=3A
5V<V
IN
<40V,
0.2A I
LOAD
3A
V
IN
= 12V, I
LOAD
=3A
7.5V<V
IN
<40V,
0.2A I
LOAD
3A
V
IN
=12V, I
LOAD
=3A
15V<V
IN
<40V,
0.2A
I
LOAD
3A
TYP.
1.23
73
3.3
73
5
80
12
90
LIMIT
1.193/1.18
1.267/1.28
-
3.168/3.135
3.432/3.465
-
4.8/4.75
5.2/5.25
-
11.52/11.4
12.48/12.6
-
UNIT
V
V
MIN
V
MAX
%
V
V
MIN
V
MAX
%
V
V
MIN
V
MAX
%
V
V
MIN
V
MAX
%
V
IN
=15V, I
LOAD
=3A
Specifications with boldface type are for full operating temperature range, the other type are for Tj=25
2006. 7. 6
Revision No : 2
3/6
KIA2596FP/PI00 ~ KIA2596FP/PI12
NORMALIZED OUTPUT VOLTAGE
OUTPUT VOLTAGE CHANGE (%)
OUTPUT VOLTAGE CHANGE (%)
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-50
V
IN
=20V
I
LOAD
= 3A
Normalized at
T
j
=25 C
LINE REGULATION
1.4
1.2
TJ=25 C
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
0
10
20
30
40
50
60
3.3V, 5V, 12V & ADJ
I
LOAD
=500mA
-25
0
25
50
75
100
125
JUNCTION TEMPERATURE ( C )
OUTPUT VOLTAGE (V)
EFFICIENCY
OUTPUT VOLTAGE CHANGE (%)
95
90
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0
SWITCH SATURATION VOLTAGE
V
IN
= 12V
EFFICENCY (%)
85
80
5V
Tj = -40 C
75
70
65
3.5V
25 C
125 C
0
5
10
15
20
25
30
35
40
1
2
3
4
INPUT VOLTAGE(V)
SWITCH CURRENT (A)
SWITCH CURRENT LIMIT
5.5
V
IN
= 12V
V
OUT
= 5V
DROPOUT VOLTAGE
1.6
L = 33µH
R
IND
= 0.04Ω
V
OUT
= V
REG
= 50mV
SUPPLY CURRENT (mA)
INPUT - OUTPUT
DIFFERENTIAL (V)
5.0
1.4
1.2
1.0
0.8
0
I
LOAD
= 1A
4.5
I
LOAD
= 3A
4.0
3.5
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
JUNCTION TEMPERATURE ( C )
JUNCTION TEMPERATURE ( C )
2006. 7. 6
Revision No : 2
4/6
KIA2596FP/PI00 ~ KIA2596FP/PI12
OPERATING QUIESCENT CURRENT
24
5V < V
IN
< 40V
I
SWITCH
= 0
SHUTDOWN QUIESCENT CURRENT
500
V
ON/OFF
= 5V
400
SUPPLY CURRENT (mA)
20
16
12
8
4
0
-50
-25
0
25
50
CURRENT (µA)
T
j
= 25 C
Switch ON
300
T
j
= -40 C AND 125 C
200
100
50
0
Switch OFF
75
100
125
0
10
20
30
40
JUNCTION TEMPERATURE ( C )
SUPPLY VOLTAGE (V)
MINIMUM OPERATING VOLTAGE
5
4
3
2
1
0
2.5
ON/OFF THRESHOLD VOLTAGE
THRESHOLD VOLTAGE (V)
INPUT VOLTAGE (V)
2.0
1.5
1.0
OFF
ON
0.5
0
V
OUT
= 1.23V
I
LOAD
= 120mA
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
JUNCTION TEMPERATURE ( C )
JUNCTION TEMPERATURE ( C )
ON/OFF PIN CURRENT (SINKING)
8
7
V
IN
=40V
-40
C
T
j
125
C
SWITCHING FREQUENCY
200
FREQUENCY (KHz)
0
5
10
15
20
25
CURRENT (µA)
6
5
4
3
2
1
0
150
100
50
0
-50
-25
0
25
50
75
100
125
ON/OFF PIN VOLTAGE (V)
JUNCTION TEMPERATURE ( C )
2006. 7. 6
Revision No : 2
5/6
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