RS2596
150KHz, 3A PWM Buck DC/DC Converter
DESCRIPTION
The RS2596 is Monolithic IC that design for a
step-down DC/DC Converter, and own the ability of
driving a 3A load without additional transistor
component.
The output version included 3.3V, 5V, 12V and an
adjustable type. It operates at a switching frequency of
150KHz 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. 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.
FEATURES
3.3V, 5V, 12V and adjustable
Adjustable version output voltage range: 1.23-37V
4% max over line and load conditions
150KHz 15% fixed switching frequency
TTL shutdown capability
Operating voltage can be up to 40V
Output load current: 3A
TO220-5, TO263-5 packages
Low power standby mode
Thermal-shunt down and current-limit protection
Built-in switching a transistor on chip, requires only 4
external components
APPLICATIONS
Simple High-efficiency step-down regulator
Positive to negative converter
On-card switching regulators
BLOCK DIAGRAM
Tel: 886-66296288
‧
Fax: 886-29174598
‧
http://www.princeton.com.tw
‧
2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan
RS2596
APPLICATION CIRCUIT
ORDER INFORMATION
Device
Device Code
XX is nominal output voltage (for example, AD=ADJ, 33=3.3V, 50=5.0V, 12=12V).
Y is package designator:
U: TO-263-5
E: TO-220-5
Z is Lead Free designator:
P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package
G: Green (Halogen Free with Commercial Standard)
RS2596-XX Y Z
PIN CONFIGURATION
TO-263-5
TO-220-5
PIN DESCRIPTION
Pin Name
VIN
VOUT
GND
FB
SD
Description
Regulator Input Pin
Regulator Output Pin
Ground Pin
Output Voltage Feed Back Control Pin
ON/OFF Shutdown Pin
Pin No.
TO-263-5
TO-220-5
1
1
2
2
3, 6
3, 6
4
4
5
5
V1.1
2
August 2014
RS2596
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply voltage
On/Off pin input voltage
Feedback pin voltage
Output voltage to ground
Power dissipation
Storage temperature
Operating junction temperature range
Operating voltage
(NOTE1)
Range
40
-0.3~+25
-0.3~+25
-1
Internally Limited
-40~+150
-40~+125
+4.5~+40
Units
V
V
V
V
W
℃
℃
V
Symbol
V
CC
V
SD
V
FB
V
OUT
P
D
Tstg
T
J
V
OP
ELECTRICAL CHARACTERISTICS
(CONTINUED)
(Note 2)
Specifications with boldface type apply over for full operating temperature range, the other type are for T
J
=25℃
Typ.
Max.
Part No.
Parameter
Symbol
Conditions
Min.
(Note3) (Note4)
3.168
3.342
Output voltage
V
OUT
5VV
IN
40V,
0.2AI
LOAD
3A
3.3
3.135
3.465
RS2596-3.3V
Efficiency
V
IN
=12V, I
LOAD
=3A
-
72
-
4.800
5.200
Output voltage
V
OUT
7VV
IN
40V,
0.2AI
LOAD
3A
5.0
4.750
5.250
RS2596-5.0V
Efficiency
V
IN
=12V, I
LOAD
=3A
-
79
-
11.52
12.48
Output voltage
V
OUT
15VV
IN
40V,
0.2AI
LOAD
3A
12.0
11.40
12.60
RS2596-12V
Efficiency
V
IN
=25V, I
LOAD
=3A
-
90
-
1.267
4.5VV
IN
40V,
0.2AI
LOAD
3A
Reference voltage
V
FB
1.193
1.230
1.280
V
OUT
programmed for 3V
RS2596-ADJ
Efficiency
V
IN
=12V, I
LOAD
=3A
-
72
-
Unit
V
%
V
%
V
%
V
%
V1.1
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August 2014
RS2596
ALL OUTPUT VOLTAGE VERSIONS ELECTRICAL
CHARACTERISTICS
Specifications with
boldface type
apply over for full operating temperature range, the other type are for T
J
=25℃
(Unless otherwise specified, V
IN
=12V for the 3.3V, 5V, and adjustable version and V
IN
=24V for the 12V version,
I
LOAD
=500mA)
Parameter
Symbol
Test Condition
Min. Typ. Max.
Device Parameters
50
Feedback bias current
I
b
Adjustable version only, V
FB
=1.3V
-
40
100
127
173
Oscillator frequency
f
O
(Note 5)
150
110
173
1.4
Saturation voltage
V
SAT
I
OUT
=3A (Note 6, 7)
-
1.16
1.5
Max. duty cycle (ON)
(Note 7)
100
DC
-
-
Min. duty cycle (OFF)
(Note 8)
0
5.5
Current limit
I
CL
Peak current (Note 6, 7)
3.6
-
6.9
Output leakage current
I
L
Output=0V (Note 6, 8)
-
-
50
Quiescent current
I
Q
(Note 8)
-
5
30
200
Standby quiescent current
I
STBY
ON/OFF pin=5V (Note 9)
-
85
300
TO220-5
-
2.5
-
θ
JC
Junction to case
TO263-5
-
3.5
-
Thermal resistance
TO220-5
-
28
-
θ
JA
Junction to ambient
(Note 10) TO263-5
-
30
-
ON/OFF Control
V
IH
Low (Regulator ON)
-
0.6
ON/OFF pin logic input threshold voltage
1.4
V
IL
High (Regulator OFF)
2.0
-
I
IH
V
LOGIC
=2.5V (Regulator OFF)
-
6
15
ON/OFF pin input current
I
IL
V
LOGIC
=0.5V (Regulator ON)
-
0.02
5
Unit
nA
KHz
V
%
A
μA
mA
μA
℃/W
℃/W
V
μA
Notes:
1. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the
device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the
Electrical Characteristics.
2. External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching
regulator system performance.
3. Typical numbers are at 25℃ and represent the most likely norm.
4. All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All
limits are used to calculate Average Outgoing Quality Level (AOQL).
5. The switching frequency is reduced when the second stage current limit is activated.
6. No diode, inductor or capacitor connected to output pin.
7. Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
8. Feedback pin removed from output and connected to 12V for the 3.3V, 5V, ADJ. version, and 15V for the 12V version, to force the output transistor
switch OFF.
9. V
IN
=40V.
10. Junction to ambient thermal resistance. (With copper area of approximately 3in
2
)
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August 2014
RS2596
CHARACTERISTICS CURVE
Normalized Output Voltage
1.5
V
IN
=12V
I
LOAD
=200mA
Shutdown Quiescent Current
160
140
120
1
Output Voltage Change (%)
.
.
0.5
Current (uA)
100
80
60
V
ON
/V
OFF
=5V
T
J
=25
o
C
0
-0.5
40
-1
20
0
0
25
50
75
100
o
-1.5
125
150
175
0
10
Junction Temperature ( C)
20
30
Supply Voltage (V)
40
Switch Current Limit
6.00
5.90
1.30
V
IN
=12V
T
J
=25
o
C
1.20
Switch Saturation Voltage
Switch Current Limit (A)
5.70
5.60
5.50
5.40
V
IN
=12V
V
OUT
=5V
Saturation Voltage (V)
5.80
1.10
1.00
0.90
5.30
5.20
0
25
50
75
100
o
0.80
125
150
0
1
2
3
4
Junction Temperature ( C)
Switch Current (A)
On/Off Pin Current (Sinking)
12
10
Current (uA)
8
V
IN
=40V
T
J
=25
o
C
6
4
2
0
0
5
10
15
20
25
30
On/Off Pin Voltage (V)
V1.1
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August 2014
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