PJ2596
150KHz, 3A PWM Buck Switching Regulator
Preliminary
switching regulator, capable of driving a 3A load without
additional transistor component. The external shutdown
function can be controlled by TTL logic level and then 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
____________
T
The PJ2596 is a monolithic integrated circuit that
provide all the active function for a step-down
limit is against over current operating of the output switch.
The PJ2596 operates at a switching frequency of PJ2596 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.
FEATURES
•
•
•
•
•
•
•
•
•
•
3.3V, 5V, 12V and adjustable output versions
Input voltage range up to 25V
Output load current: 3A
Built-in switching transistor on chip
Low power standby mode
ON/OFF shutdown control input
Thermal-shutdown and current-limit protection
150kHz fixed frequency internal oscillator
Voltage mode non-synchronous PWM control
Adjustable version output voltage range, 1.23V to
25V±4% max over line and load condition
TO-220-5L
TO-263-5L
PIN
PIN
PIN
PIN
PIN
1. Input
2. Output
3. Ground
4. Feed Back
5.On/off
ORDERING INFORMATION
Device
PJ2596CZ-xx
PJ2596CM-xx
Operating Temperature
-40℃ to +85℃
Package
TO-220-5L
TO-263-5L
APPLICATIONS
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•
•
•
•
Simple High-efficiency step-down(buck) regulator
Battery Charger
Positive to negative converter
On-card switching regulator
Efficient preregulator for linear regulator
Note:
xx is output voltage available for Adj /3.3V/ 5.0v/
12V. Contact factory for additional voltage option.
TYPICAL APPLICATION CIRCUIT
1-6
2004/07.rev.B
PJ2596
150KHz, 3A PWM Buck Switching Regulator
Preliminary
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to ground
Power dissipation
Storage tempurature
Operating tempeture
Operating voltage
Symbol
Vcc
Von/off
V
FB
Vout
P
D
T
ST
T
OP
V
OP
Rating
25V
-0.3 to +25V
-0.3 to +25V
-1V
Internally limited
-65 to +150℃
-40 to +125℃
+4.5 to +25V
ELECTRICAL CHARACTERISTICS
Vin =12V for the 3.3V, 5V, and Adjustable version and Vin =24V for the 12V version , Tj = 25℃, I
L
= 0.3A, unless otherwise
noted.
Parameter
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Min Duty Cycle (OFF)
Current Limit
Output Leakage
Current
Quiescent Current
Standby Quiescent Current
ON/OFF pin logic input voltage
threshold
ON/OFF pin logic input current
ON/OFF pin input current
Thermal Resistance
Thermal Resistance With copper area of
approximately 3 in
2
Output = 0V
Output = -1V
IOUT = 3ANo 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
Vin=24V
V
FB
=12 force driver off
ON/OFF pin = 5V (OFF)
Low (regulator ON)
High (regulator OFF)
V
LOGIC
=2.5V (OFF)
V
LOGIC
=0.5V (ON)
TO-220-5L
TO-263-5L
TO-220-5L
TO-263-5L
Junction to Case
Junction to Ambient
3.5
--
--
--
2.0
--
--
--
--
Conditions
VFB = 1.3V( Adjustable Version Only)
Min
--
127
110
Typ
40
150
1.3
100
0
4.5
5.5
6.5
200
2
5
50
1.3
15
0.02
2.5
3.5
28
23
30
10
250
300
0.6
25
5
--
--
Max
60
100
173
173
1.4
1.5
UNITS
nA
kHz
V
%
A
uA
mA
mA
uA
V
uA
℃/W
℃/W
2-6
2004/07.rev.B
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