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RS2596
150KHz, 3A PWM Buck DC/DC Converter
RS2596 Series
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.
TO220-5L Package
1 2 3 4 5
Features
•
3.3V, 5V, 12V and adjustable
•
Adjustable version output voltage range: 1.4-37V
• ±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
•
TO220-5L and TO263-5L packages
•
Low power standby mode
•
Thermal-shuntdown and current-limit protection
•
High efficiency
•
Built-in switching a transistor on chip, requires only 4 external components
TO263-5L Package
1 2 3 4 5
Applications
•
Simple High-efficiency step-down regulator
•
Positive to negative converter
•
On-card switching regulators
Connection Diagrams
TO220-5L
Pins 1,3,5
Side
View
Pins 2,4
Side
View
5 - On/Off
4 - Feed Back
3 - Ground
2 - Output
1 - VIN
Metal Tab GND
TO263-5L
Top
View
Metal Tab GND
5 - On/Off
4 - Feed Back
3 - Ground
2 - Output
1 - VIN
Top
View
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Pin Connections
SD
VIN
Current
Source
Bias
+
+
220mV
R
1.235V
Reference
2.5V
Regulator
Start
Up
200mV
+
COMP
-
Current
Limit
FB
R2
+
AMP
-
+
COMP
-
-
COMP
+
150KHz
OSC.
-
COMP
+
3A
Switch
Driver
Thermal
Limit
R1=2.5K
Output
GND
Absolute Maxium Rating
(Note1)
Parameter
Supply Voltage
On/Off Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
Operating Temperature
Storage Temperature
Operating Junction Temperature Range
Operating Voltage
Symbol
V
CC
V
SD
V
FB
V
OUT
P
D
T
opr
T
stg
T
J
V
OP
Value
40
-0.3~+25
-0.3~+25
-1
Internally Limited
0~+70
-65~+150
-40~+125
+4.5~+40
Unit
V
V
V
V
W
o
o
o
C
C
C
V
Electrical Characteristics (Continued)
Specifications with
boldface type
apply over for full operating temperature range, the other type are for T
J
=25 C
o
(Note 2)
Part No.
Parameter
Output Voltage
Efficiency
Symbol
V
OUT
η
V
OUT
η
V
OUT
η
V
FB
η
Conditions
4.75V≤V
IN
≤40V,
0.2A≤I
LOAD
≤3A
V
IN
=12V, I
LOAD
=3A
7V≤V
IN
≤40V,
0.2A≤I
LOAD
≤3A
V
IN
=12V, I
LOAD
=3A
15V≤V
IN
≤40V,
0.2A≤I
LOAD
≤3A
V
IN
=25V, I
LOAD
=3A
8V≤V
IN
≤40V,
0.2A≤I
LOAD
≤3A
V
OUT
programmed for 5V
V
IN
=12V, V
OUT
=5V, I
LOAD
=3A
Min.
3.168
3.135
-
4.800
4.750
-
11.52
11.40
-
1.193
-
Typ.
Max.
(Note3) (Note4)
3.3
73
5.0
80
12.0
90
1.230
77
3.342
3.465
-
5.200
5.250
-
12.48
12.60
-
1.267
1.280
-
Unit
V
%
V
%
V
%
V
%
RS2596-3.3
RS2596-5.0
Output Voltage
Efficiency
RS2596-12
Output Voltage
Efficiency
RS2596-ADJ
Reference Voltage
Efficiency
DS-RS2596-04 Oct, 2007
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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 C
(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)
o
Parameter
Device Parameters
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
Symbol
Test Condition
Min.
Typ.
Max.
50
100
173
173
1.4
1.5
-
5.5
6.5
50
10
250
300
-
-
-
-
0.6
-
15
5
Unit
I
b
f
O
V
SAT
DC
I
CL
I
L
I
Q
I
STBY
θ
JC
Adjustable Version Only, V
FB
=1.3V
(Note 5)
-
127
110
-
-
3.6
-
-
-
-
-
-
-
-
2.0
-
-
10
150
1.3
100
0
4.5
-
5
150
2.5
3.5
28
23
nA
KHz
V
%
A
uA
mA
uA
o
I
OUT
=3A
(Note 6,7)
(Note 7)
(Note 8)
Peak Current
(Note 6,7)
Output=0V
(Note 6,8)
(Note 8)
ON/OFF pin=5V
(Note 9)
TO220-5L
TO263-5L
TO220-5L
TO263-5L
Junction to
Case
Junction to
ambient
C/W
C/W
Thermal Resistance
θ
JA
ON/OFF Control
ON/OFF Pin Logic Input Threshold
Voltage
ON/OFF Pin Input Current
V
IH
V
IL
I
IH
I
IL
(Note 10)
o
Low (Regulator ON)
High (Regulator OFF)
V
LOGIC
=2.5V (Regulator OFF)
V
LOGIC
=0.5V (Regulator ON)
1.3
5
0.02
V
uA
Note 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.
Note 2: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance.
Note 3: Typical numbers are at 25 C and represent the most likely norm.
Note 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).
Note 5: The switching frequency is reduced when the second stage current limit is activated.
Note 6: No diode, inductor or capacitor connected to output pin.
Note 7: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 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.
Note 9: V
IN
=40V.
Note 10: Junction to ambient thermal resistance. (With copper area of approximately 3in )
2
o
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Page No. : 4/4
Characteristics Curve
Normalized Output Voltage
1.5
V
IN
=12V
I
LOAD
=200mA
160
140
120
Shutdown Quiescent Current
1
Output Voltage Change (%)
.
.
Current (uA)
0.5
100
80
60
40
V
ON
/V
OFF
=5V
T
J
=25 C
o
0
-0.5
-1
20
-1.5
0
25
50
75
100
o
125
150
175
0
0
10
20
30
Supply Voltage (V)
40
Junction Temperature ( C)
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
5.30
5.20
0
25
50
75
100
o
Saturation Voltage (V)
5.80
1.10
V
IN
=12V
V
OUT
=5V
1.00
0.90
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 C
o
6
4
2
0
0
5
10
15
20
25
30
On/Off Pin Voltage (V)
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Page No. : 5/5
Typical Application Circuit
Fig.1 Fixed Type Circuit
Fig.2 Adjustable Output Voltage Versions
DS-RS2596-04 Oct, 2007
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