KP1503A Datasheet PDF - KTC

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KP1503A
KTC

Part Number KP1503A
Description 2A PWM Buck Switching Regulator+OPERATIONAL AMPLIFIER
Page 10 Pages


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KP1503A
125Khz, 2A PWM Buck Switching
Regulator+OPERATIONAL AMPLIFIER
General Description
The KP1503A is a monolithic integrated circuit that
provide all the active functions for a step-down
switching regulator with an additional operational
amplifier to precisely control ON/OFF function,
capable of driving a 2A load without additional
transistor component. Requiring a minimum
number of external component, the board space
can be saved easily. The external shutdown
function can be controlled by TTL 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 KP1503A operates at a
switching frequency of 125Khz thus allowing
smaller sized filter components than what would be
needed with lower frequency switching regulators.
Other features include a guaranteed +4% tolerance
on output voltage under specified input voltage and
output load conditions, and +15% on the oscillator
frequency. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The packages are
available in a standard 8-lead SOP8.
Features
- 3.3V, 5V, 12V and adjustable output versions
- Adjustable version output voltage range, 1.23V to
37V +4% max over line and load condiction
- SOP-8L packages
- Voltage mode non-synchronous PWM control
- Thermal-shutdown and current-limit protection
- ON/OFF shutdown control input
- Input voltage range up to 40V
- Output load current: 2A
- 125 kHz fixed frequency internal oscillator
- Low power standby mode
- Built-in switching transistor on chip
Applications
- Simple High-efficiency step-down(buck) regulator
- Efficient preregulator for linear regulators
- On-card switching regulators
- Positive to negative converter
- Battery Charger
Pin Assignments
Pin Descriptions
Name
Description
VIN Operating voltage input.
Out Switching output.
Gnd Ground.
FB Output voltage feedback control.
SD ON /OFF , Low:Active ; High:Shutdown
OPO Operational Amplifier Output.
OP- Operational Amplifier Negative Input
OP+ Operational Amplifier Positive Input
EXPOSED Pad for heatsinking purposes.Connect
PAD to groung plane using multiple vias.
This datasheet contains new product information. Kalai Technology Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of
the use of this product. No rights under any patent accompany the sale of the product.
Rev. 1.0 MAR.08, 2005
1/10
KALAI TECHNOLOGY CORPORATION



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125Khz, 2A PWM Buck Switching
Regulator+OPERATIONAL AMPLIFIER
Ordering Information
KP1503A
Block Diagram
SD
OPO
OP+
OP-
FB
Current
Source
bias
1.235V
Reference
2.5V
Regulator
Start
up
+
Amp
-
+
_Amp
Comp
+
200mV
220mV
+
Com_p
Comp
+
Pre-driver
2A
Switch
125kHz
OSC.
Thermal
Limit
VIN
Output
Gnd
Kalai Technology Corp.
www.kalai.com.tw
2/10
REV. 1.0 MAR.08, 2005



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125Khz, 2A PWM Buck Switching Regulator
Absolute Maximum Ratings
Symbol
Parameter
VCC Supply Voltage
VSD ON/OFF Pin input voltage
VFB Feedback Pin voltage
VOUT
Output voltage to Ground
PD Power dissipation
TST Storage temperature
TOP Operating temperature
VOP Operating voltage
Rating
+45
-0.3 to +25
-0.3 to +25
-1
Internally limited
-65 to +125
-40 to +125
+4.5 to +25
KP1503A
Unit
V
V
V
V
W
oC
oC
V
Electrical Characteristics for Switching Regulator
Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=24V for the 12V version. ILOAD = 0.3A
Symbol
Parameter
Conditions
Min.
Typ.
Max.
IB
Feedback bias current
VFB=1.3V
(Adjustable version only)
-10
-50
-100
FOSC oscillator frequency
105
100
125
140
150
Fscp
VSAT
DC
Oscillator frequency
short circuit protect
saturation voltage
Max. Duty Cycle(ON)
of When current limit occurred
and VFB <0.55V
IOUT=1.5A
no outside circuit
VFB=0V force driver on
VFB=0V force driver on
40
1.20
100
1.4
1.5
Min. Duty cycle(OFF)
VFB=12V force driver off
peak current
ICL current limit
no outside circuit
VFB=0 force driver on
IL
Output
Output = 0V leakage
current
no outside circuit
VFB=12 force driver off
0
2.8
2.2
3.6
-200
Output = -1V
VIN=24V
-5
IQ
ISTBY
Quiescent Current
Standby Quiescent
Current
VFB=12 force driver off
ON/OFF pin=5V
VIN=24V
5 10
70
125
200
VIL ON/OFF pin logic input Low (regulator ON)
VIH threshold voltage
High (regulator OFF)
IH
ON/OFF pin logic
input current
VLOGIC=2.5V (OFF)
- 1.3 0.6
2.0 -
-0.01
IL ON/OFF pin input current VLOGIC=0.5V (ON)
-0.1 -1
Ts
Over temperature
shutdown threshold
Tj increasing
Tj decreasing
165
145
Kalai Technology Corp.
www.kalai.com.tw
3/10
Rev. 1.0 MAR.08, 2005
Unit
nA
Khz
Khz
V
%
A
uA
mA
mA
uA
V
uA



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125Khz, 2A PWM Buck Switching Regulator
KP1503A
Electrical Characteristics for Operational Amplifier(Continued)
Electrical characteristics at specified free-air temperature, VIN=5V(unless otherwise noted)
Parameter
VIO
Input offset Voltage
Test Conditions
VIN=5V to MAX
VIC= VICRMIN
VOPO=1.4V
25
Full
Range
Min.
LM358
Typ.
3
Max.
7
9
αVIO
Average Temperrature Coffcient
of Input Offset Voltage
IIO
Input offset Current
VOPO=1.4V
Full Range
25
Full Range
7
2 50
125
αllo
Average Temperature Coefficient
of Input Offset Voltage
IIB
Input bias Current
VICR
Common-Mode Input Voltage
Range
VOH
High-LevelOutput Voltage
VOL
Low-Level Output Voltage
AVD
Large-Signal Differential Voltage
Amplification
CMRR
Common-Mode Rejection Ratio
KSVR Supply voltage Rejection
Ration(VIN/VIO)
IO
Output Current
IOS
Short-Circuit Output Current
ICC
Supply Current (Only for Amplifiers)
Full Range
VOPO=1.4V
VIN=5V to MAX
RL2K
VIN=MAX RL=2K
VIN=MAX
RL10K
RL10K
25
Full Range
25
0to VCC-1.5
Full Range 0to VCC-2
25
0to VCC-1.5
Full Range 26
Full Range 27
Full Range
VIN=15V
VOPO=1V to 11V
RL2 K
25
Full Range
VIN=5V to MAX
VIC=VICRMIN
25
VIN=5V to MAX
25
VIN=15V
VID=1V, VOPO=0
25
Full Range
VIN=15V
25
VID=-1V,VOPO=15V Full Range
VID= -1V,
VOPO=200mv
25
VIN at 5V
GND at -5V , VO=0
25
VO-2.5V,No Load Full Range
VIN=MAX
VOPO=0.5VIN,
Load
No Full Range
25
15
65
65
-20
-10
10
5
12
10
-20
28
5
100
80
100
-30
20
30
±40
0.7
1
-250
-500
20
±60
1.2
2
Unit
mV
μV/
nA
pA/
nA
V
mv
V/mv
dB
dB
mA
μA
mA
mA
Kalai Technology Corp.
www.kalai.com.tw
4/10
Rev. 1.0 MAR.08, 2005



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