TS2596
Taiwan Semiconductor
3A / 150kHz Step-Down DC-DC Converter
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 100μA (typical) standby current. The
output switch includes cycle-by-cycle current limiting, as
well as thermal shutdown for full protection under fault
conditions.
FEATURES
● Output voltage: 3.3V, 5V & adjustable version
● Adjustable output voltage range 1.23V~38.5V
● 150kHz fixed switching frequency
● Voltage mode Non-synchronous PWM control
● Thermal shutdown and current limit protection
● ON/OFF shutdown control input
● Short circuit protect (SCP)
● Operating voltage can be up to 40V
● Output load current 3A
● Low power standby mode
● Built-in switching transistor on chip
● Compliant to RoHS Directive 2011/65/EU and in
accordance to WEEE 2002/96/EC.
● Halogen-free according to IEC 61249-2-21
APPLICATION
● Simple High-efficiency Step down Regulator
● On-Card Switching Regulators
● Positive to Negative Converter
TO-263-5L (D PAK)
2
Pin Definition:
1. Input
2. SW Output
3. Ground
4. Feedback
5. Enable
Notes:
Moisture sensitivity level: level 3. Per J-STD-020
TYPICAL APPLICATIN CIRCUIT
Adjustable Output Voltage Version
V
OUT
= V
FB
×
(1 +
R1
), V
FB
= 1.23V, R2 = 0.7k ~ 3k
R2
1
Version: G1608
TS2596
Taiwan Semiconductor
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Maximum Supply Voltage
Recommend Operating Supply Voltage
SW, EN Pin Input Voltage
Feedback Pin Voltage
Power Dissipation
Output Voltage to Ground
Storage Temperature Range
Operating Temperature Range
ESD Susceptibility (HBM)
SYMBOL
V
CC
V
OP
V
SW
, V
EN
V
FB
P
D
V
OUT
T
ST
T
OP
LIMIT
+45
+4.5 to +40
-0.3 to +40
-0.3 to +12
Internally Limited
-1
-65 ~ +150
-40 ~ +125
2
UNIT
V
V
V
V
W
V
°C
°C
kV
THERMAL INFORMATION
PARAMETER
Junction to Case Thermal Resistance
Junction to Ambient Thermal Resistance
SYMBOL
R
ӨJC
R
ӨJA
LIMIT
2
50
2
UNIT
°C/W
°C/W
Note:
R
ӨJA
is measured with the PCB copper area (need connect to GROUND pins) of approximately 1.5 in (Multi-layer)
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V for 3.3V, 5V, Adjustable Version, I
LOAD
= 0.3A, T
A
= 25°C unless otherwise noted)
PARAMETER
Output Feedback
ADJ
Efficiency
Output Feedback
Efficiency
Output Feedback
Efficiency
Feedback Bias Current
Oscillator Frequency
Soft-Start Time
Current Limit
Oscillator Frequency of
Short Circuit Protect
Saturation Voltage
ON/OFF Pin Logic Input
Threshold Voltage
Rising edge of EN on to I
CL
Pear Current, no outside circuit
V
FB
=0V force driver on
When current limit occurred
o
and V
FB
<0.5V, Ta = 25 C
I
OUT
=3A, No outside circuit
V
FB
=0V force driver on
Low (regulator ON)
High (regulator OFF)
5V
CONDITION
4.5V ≤ V
IN
≤ 40V
0.2A ≤ I
LOAD
≤ 3A
V
IN
= 12V, I
LOAD
= 3A,
V
OUT
= 5V
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
V
FB
=1.3V (Adj version only)
SYMBOL
V
FB
η
V
FB
η
V
FB
η
I
FB
F
OSC
T
SS
I
CL
F
SCP
V
SAT
V
IL
V
IH
MIN
1.180
--
3.135
--
4.75
--
--
127
--
3.3
110
--
--
2.0
TYP
1.23
77
3.3V
75
5
80
10
150
3
--
150
1.15
1.3
1.3
MAX
1.280
--
3.465
--
5.25
--
100
173
--
--
173
1.50
0.6
--
UNIT
V
%
V
%
V
%
nA
kHz
ms
A
KHz
V
V
V
3.3V
2
Version: G1608
TS2596
Taiwan Semiconductor
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V for 3.3V, 5V, Adjustable Version, I
LOAD
= 0.3A, T
A
= 25°C unless otherwise noted)
PARAMETER
ON/OFF Pin Logic Input Current
Maximum Duty Cycle (ON)
Maximum Duty Cycle (OFF)
Quiescent Current
Standby Quiescent Current
SW Pin Leakage
Current
SW pin = 0
SW pin = -1
CONDITION
V
LOGIC
=2.5V (OFF)
V
LOGIC
=0.5V (ON)
V
FB
=0V force driver on
V
FB
=12V force driver off
V
FB
=12V force driver off
ON/OFF pin=5V
V
IN
=40V
No outside circuit,
V
FB
=12V force driver off
V
IN
=12V
SYMBOL
I
H
I
L
DC
I
Q
I
STBY
MIN
--
--
--
--
--
--
--
--
--
TYP
5
0.02
100
0
5
80
0.3
7.5
MAX
15
5
--
--
10
200
250
2
30
UNIT
µA
%
mA
µA
mA
mA
I
SWL
ORDERING INFORMATION
OUTPUT VOLTAGE
3.3V
5.0V
ADJ
PART NO.
TS2596CM533 RNG
TS2596CM550 RNG
TS2596CM5 RNG
PACKAGE
TO-263-5L
(D
2
PAK)
TO-263-5L
(D
2
PAK)
TO-263-5L
(D
2
PAK)
PACKING
800pcs / 13” Reel
800pcs / 13” Reel
800pcs / 13” Reel
BLOCK DIAGRAM
3
Version: G1608
TS2596
Taiwan Semiconductor
PIN FUNCTION DESCRIPTION
V
CC
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented
at this pin to minimize voltage transients and to supply the switching currents needed by the regulator.
Ground
Circuit ground
SW Output
Internal switch. The voltage at this pin switches between (+V
CC
– V
SAT
) and approximately – 0.5V, with a duty cycle
of approximately V
OUT
/ V
CC
. To minimize coupling to sensitive circuitry, the PC board copper area connected to this
pin should be minimized.
Feedback
Sense the regulated output voltage to complete the feedback loop.
Enable
Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply
current to approximately 100µA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator
on, and pulling this pin above 1.3V (up to a maximum of V
CC
) shuts the regulator down. If this shutdown feature is
not needed, the EN pin can be wired to the ground pin.
Thermal Considerations
The TS2596 (TO-263-5L package) junction temperature rise above ambient temperature with a 3A load for various
input and output voltages. This data was taken with the circuit operating as a buck switching regulator with all
components mounted on a PC board to simulate the junction temperature under actual operating conditions. This
curve can be used for a quick check for the approximate junction temperature for various conditions, but be aware
that there are many factors that can affect the junction temperature. When load currents higher than 3A are used,
double sided or multilayer PC boards with large copper areas and/or airflow might be needed, especially for high
ambient temperatures and high output voltages.
For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper
should be used in the board layout. (Once exception to this is the output (switch) pin, which should not have large
areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the
surrounding air, and moving air lowers the thermal resistance even further.
4
Version: G1608
TS2596
Taiwan Semiconductor
TYPICAL APPLICATIN CIRCUIT
Adjustable Output Voltage Version
V
OUT
= V
FB
×
(1 +
R1
), V
FB
= 1.23V, R2 = 0.7k ~ 3k
R2
V
OUT
5.0V
3.3V
2.5V
R2
1.5kΩ
1.5kΩ
1.5kΩ
R1
4.7kΩ
2.5kΩ
1.5kΩ
Fixed Output Voltage Version
L1 recommend value (I
OUT
=3A,)
V
OUT
V
IN
=12V
V
IN
=24V
2.5V
33µH
33µH
3.3V
33µH
33µH
5V
33~47µH
47µH
12V
NA
68µH
5
Version: G1608
微控制器 MCU
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