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TS2596 Preliminary
3A Step Down Switching Voltage Regulator
Pin assignment:
1. Input
2. Output
3. Ground
4. Feedback
5. Enable
150KHz Oscillating Frequency
Output Current up to 3A
Enable Input Control
General Description
The TS2596 Series are step-down switching regulators with all required active functions. It is capable of driving 3A load
with excellent line and load regulations. These devices are available in fixed output voltages of 3.3V, 5V, and an
adjustable output version.
The TS2596 series operates at a switching frequency of 150kHz thus allowing smaller sized filter components than what
would be needed with lower frequency switching regulators. It substantially not only reduces the area of board size but
also the size of heat sink, and in some cases no heat sink is required. The ±4% tolerance on output voltage within
specified input voltages and output load conditions is guaranteed. Also, the oscillator frequency accuracy is within ±10%.
External shutdown is included. Featuring 70µA (typical) standby current. The output switch includes cycle-by-cycle current
limiting, as well as thermal shutdown for full protection under fault conditions.
This series are offered in 5-pin TO-263, TO-220 package.
Features
Guaranteed 3A output current
3.3V, 5V, and adjustable versions
Wide input voltage range, up to 40V
Internal oscillator of 150KHz fixed frequency
Wide adjust version output voltage range, from 1.23V
to 25V ±4% max. at over line and load conditions.
Low standby current, typ. 70µA, at shutdown mode
Requires only 4 external components
Thermal shutdown and current limit protection
P+ product enhancement tested
Absolute Maximum Rating
Ordering Information
Part No.
TS2596CZ5xx
TS2596CZ5
TS2596CM5xx
TS2596CM5
Note: Where xx denotes voltage option, available are
5V and 3.3V. Leave blank for adjustable
version. Contact factory for additional voltage
options.
Operating Temp.
Package
(Ambient)
TO-220-5L
-20 ~ +85 oC
TO-263-5L
Applications
LCD Monitors
ADD-ON Cards Switching Regulators
High Efficiency Step-Down Regulators
Efficient Pre-regulator for Linear Regulator
Input Voltage Vin +40 V
ENABLE Pin Input Voltage Vin (operate) -0.3V ≤ V ≤ Vin V
Power Dissipation PD Internal Limited W
Operating Junction Temperature Range TJ -40 ~ +125
Storage Temperature Range T
Lead Soldering Temperature (260 oC) 5 S
-65 ~ +150
STG
o
C
o
C
TS2596 1-6 2003/12 rev. D
Thermal Performance
Condition Symbol Limits Unit
Thermal Resistance Junction to Ambient Θja 30
Thermal Resistance Junction to Case Θjc 3
Recommended Operating Conditions (Ta = 25
o
C)
o
C/W
Condition Symbol Limits Unit
Input Voltage Vin 4.5 ~ 28 V
ENABLE Pin Input Voltage Vin (operate) 0 ~ +20 V
Block Diagram
Electrical Characteristics
Vin = 12V, IL = 500mA, Ta = 25
Parameter Conditions Min Typ Max Unit
TS2596-3.3V
Output Voltage (Note 1)
Efficiency Vin=12V, IL=3A -- 75 -- %
TS2596-5V
Output Voltage (Note 1)
Efficiency Vin=12V, IL=3A -- 80 -- %
o
C unless otherwise specified.
0.2A ≤ I
(Figure 1)
0.2A ≤ I
(Figure 1)
≤ 3A, 5.07V ≤ Vin ≤ 40V
L
≤ 3A, 8V ≤ Vin ≤ 40V
L
0.96|Vo| 3.3 1.04|Vo| V
0.96|Vo| 5.0 1.04|Vo| V
TS2596 2-6 2003/12 rev. D
Electrical Characteristics (Continued)
Vin = 12V, IL = 500mA, Ta = 25
o
C unless otherwise specified.
TS2596 Adjustable
Feedback Voltage (Note 1)
Efficiency Vin=12V, Vout=5V, IL=3A -- 75 -- %
0.2A ≤ I
Vout=5V (Figure 2)
All Output Voltage Version (Vin= 12V, I
Oscillator Frequency (Note 2) 127 150 173
Quiescent Current (Note 3) -- 5 10
Standby Current ENABLE =5V -- 70 200
Saturation Voltage (Note 4) I
Feedback Bias Current V
Duty Cycle (Note 5) Operating (ON) 93 98 --
Current Limit (Note 2)(Note 4) -- 4.5 --
Output Leakage Current (Note 3)
ENABLE Threshold Voltage
ENABLE Input Current
Note 1: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator
system performance. Refer to Application information for details.
Note 2: The oscillator frequency reduces when the second stage current limit is activated. The amount of reduction is
determined by the severity of current over load.
Note 3: For these parameters, FB is removed from V
Note 4: V
Note 5: FB is removed from V
pin sourcing current. No diode, inductor or capacitor connected to V
OUT
OUT
LOAD
OUT
V
OUT
V
OUT
VIH (V
VIL(V
I
IH
I
IH
and connected to 0V.
≤ 3A, 8V ≤ Vin ≤ 40V,
L
= 500mA)
L
=3A -- 1.2 1.5
=5V (Adj. Version only) -- 50 100
=0V -- 0.3 2
=-1V -- 7.5 30
=0V) 2.0 -- --
OUT
=Normal Output Voltage) -- -- 0.6
OUT
(ENABLE =5V) -- 12 30
(ENABLE =0V) -- 0 10
and connected to +12V to force the output transistor OFF.
OUT
0.96|Vo| 1.23 1.04|Vo| V
kHz
mA
uA
V
nA
%
A
mA
V
uA
OUT.
TS2596 3-6 2003/12 rev. D
Typical Application Circuit
Figure 1 Fixed Voltage Version
Figure 2: Adjustable Voltage Version
Figure 3: LC filter for Low Output Ripple
TS2596 4-6 2003/12 rev. D
Application Data
Quick Design Component Selection Table for Fixed Output
Input / Output Condition Inductor Output Capacitor
Load current
(V)
5
3.3
(A)
3
2
3
2
Quick Design Component Selection Table for Adjustable Output
Input / Output Condition Output Capacitor
Output (V)
Max. Input voltage
(V)
8 22 3.5 560 25 330 10
15 33 3.5 330 35 330 10
25 47 3.5 270 35 330 10
9 22 3.1 470 25 330 10
15 68 3.1 180 35 270 10
25 68 3.1 180 35 270 10
5 22 3.5 470 25 390 6.3
12 22 3.5 560 35 390 6.3
25 33 3.5 680 35 390 6.3
6 22 3.1 470 25 390 6.3
12 33 3.1 330 35 390 6.3
25 47 3.1 330 35 330 10
Inductance
(uH)
Current
(A)
Nichicon PL series Sprague 595D seriesOutput
uF V uF V
Feedforword
Nichicon PL series Sprague 595D series
uF V uF V Value Unit
2 820 35 330 10 33 nF
4 470 35 330 10 10 nF
6 470 25 330 10 3.3 nF
9 330 25 330 10 1.5 nF
12 330 25 270 10 1 nF
15 220 35 270 10 680 pF
24 150 35 390 6.3 560 pF
Capacitor
Schottky Diode Selection Table
Reverse Voltage Forward Rectified Current (4~6A)
(V) Surface Mount Through Hole
20 -- SR502
30 SK53C SR503
40 SK54C SR504
(Taiwan Semiconductor Part Number)
TS2596 5-6 2003/12 rev. D
TO-220-5L Mechanical Drawing
G
A
B
C
M
N
L
F
K
D
E
H
DIM
A 10.00 10.50 0.394 0.413
B 3.240 4.440 0.128 0.175
C 2.440 2.940 0.096 0.116
D 0.260 1.020 0.010 0.040
E 1.570 1.830 0.062 0.072
I
J
F 13.31 14.13 0.524 0.556
G 4.475 5.225 0.176 0.206
H 1.170 1.370 0.046 0.054
I 27.60 29.44 1.087 1.159
J 2.175 2.925 0.086 0.115
K 0.297 0.477 0.012 0.019
L 8.280 8.800 0.326 0.346
M 6.010 6.510 0.237 0.256
N 14.29 15.31 0.563 0.603
TO-220 DIMENSION
MILLIMETERS INCHES
MIN MAX MIN MAX
TO-263-5L Mechanical Drawing
A
E
F
J
B
I
C
G
D
H
DIM
A 10.220 10.260 0.402 0.404
B 14.600 15.870 0.575 0.625
C 0.750 0.770 0.030 0.030
D 1.573 1.827 0.062 0.072
E 4.560 4.570 0.179 0.180
F 1.240 1.270 0.049 0.050
G 2.280 2.790 0.090 0.110
H 0.280 0.320 0.011 0.013
I 8.240 8.280 0.324 0.326
J 1.540 1.800 0.060 0.071
TO-263 DIMENSION
MILLIMETERS INCHES
MIN MAX MIN MAX
TS2596 6-6 2003/12 rev. D
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