TS2596
Taiwan Semiconductor
1 Version: G1608
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 (D2PAK)
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
VOUT = VFB
×
(1 +
R2
R1
), VFB = 1.23V, R2 = 0.7k ~ 3k
TS2596
Taiwan Semiconductor
2 Version: G1608
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL
LIMIT UNIT
Maximum Supply Voltage VCC +45 V
Recommend Operating Supply Voltage VOP +4.5 to +40 V
SW, EN Pin Input Voltage VSW, VEN -0.3 to +40 V
Feedback Pin Voltage VFB -0.3 to +12 V
Power Dissipation PD Internally Limited W
Output Voltage to Ground VOUT -1 V
Storage Temperature Range TST -65 ~ +150 °C
Operating Temperature Range TOP -40 ~ +125 °C
ESD Susceptibility (HBM) 2 kV
PARAMETER SYMBOL
LIMIT UNIT
Junction to Case Thermal Resistance RӨJC 2 °C/W
Junction to Ambient Thermal Resistance RӨJA 50 °C/W
Note: RӨJA is measured with the PCB copper area (need connect to GROUND pins) of approximately 1.5 in2 (Multi-layer)
ELECTRICAL
CHARACTERISTICS
(VIN = 12V for 3.3V, 5V, Adjustable Version, ILOAD = 0.3A, TA = 25°C unless otherwise noted)
PARAMETER CONDITION SYMBOL
MIN TYP
MAX
UNIT
Output Feedback
ADJ
4.5V ≤ VIN ≤ 40V
0.2A ≤ ILOAD ≤ 3A VFB 1.180
1.23
1.280
V
Efficiency VIN = 12V, ILOAD = 3A,
VOUT = 5V η -- 77 -- %
Output Feedback 3.3V
4.75V ≤ VIN ≤ 40V
0.2A ≤ ILOAD ≤ 3A VFB 3.135
3.3V
3.465
V
Efficiency VIN = 12V, ILOAD = 3A η -- 75 -- %
Output Feedback 5V
7V ≤ VIN ≤ 40V
0.2A ≤ ILOAD ≤ 3A VFB 4.75 5 5.25 V
Efficiency VIN = 12V, ILOAD = 3A η -- 80 -- %
Feedback Bias Current VFB =1.3V (Adj version only) IFB -- 10 100 nA
Oscillator Frequency FOSC 127 150 173 kHz
Soft-Start Time Rising edge of EN on to ICL TSS -- 3 -- ms
Current Limit Pear Current, no outside circuit
V
FB
=0V force driver on ICL 3.3 -- -- A
Oscillator Frequency of
Short Circuit Protect
When current limit occurred
and VFB <0.5V, Ta = 25oC FSCP 110 150 173 KHz
Saturation Voltage IOUT=3A, No outside circuit
V
FB
=0V force driver on VSAT -- 1.15
1.50 V
ON/OFF Pin Logic Input
Threshold Voltage
Low (regulator ON) VIL -- 1.3 0.6 V
High (regulator OFF) VIH 2.0 1.3 -- V
TS2596
Taiwan Semiconductor
3 Version: G1608
ELECTRICAL
CHARACTERISTICS
(VIN = 12V for 3.3V, 5V, Adjustable Version, ILOAD = 0.3A, TA = 25°C unless otherwise noted)
PARAMETER CONDITION SYMBOL
MIN TYP
MAX
UNIT
ON/OFF Pin Logic Input Current
VLOGIC =2.5V (OFF) IH -- 5 15 µA
VLOGIC =0.5V (ON) IL -- 0.02
5
Maximum Duty Cycle (ON) VFB =0V force driver on DC -- 100 -- %
Maximum Duty Cycle (OFF) VFB =12V force driver off -- 0 --
Quiescent Current VFB =12V force driver off IQ -- 5 10 mA
Standby Quiescent Current ON/OFF pin=5V ISTBY -- 80 200 µA
VIN =40V -- 250
SW Pin Leakage
Current
SW pin = 0
No outside circuit,
V
FB
=12V force driver off ISWL -- 0.3 2 mA
SW pin = -1
VIN =12V -- 7.5 30 mA
ORDERING INFORMATION
OUTPUT VOLTAGE PART NO. PACKAGE PACKING
3.3V TS2596CM533 RNG TO-263-5L (D2PAK) 800pcs / 13” Reel
5.0V TS2596CM550 RNG TO-263-5L (D2PAK) 800pcs / 13” Reel
ADJ TS2596CM5 RNG TO-263-5L (D2PAK) 800pcs / 13” Reel
BLOCK DIAGRAM
TS2596
Taiwan Semiconductor
4 Version: G1608
PIN FUNCTION DESCRIPTION
VCC
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 (+VCC – VSAT) and approximately – 0.5V, with a duty cycle
of approximately VOUT / VCC. 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 VCC) 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.
TS2596
Taiwan Semiconductor
5 Version: G1608
TYPICAL APPLICATIN CIRCUIT
Adjustable Output Voltage Version
VOUT = VFB
×
(1 +
R2
R1
), VFB = 1.23V, R2 = 0.7k ~ 3k
VOUT R2 R1
5.0V 1.5kΩ 4.7kΩ
3.3V 1.5kΩ 2.5kΩ
2.5V 1.5kΩ 1.5kΩ
Fixed Output Voltage Version
L1 recommend value (IOUT=3A,)
VOUT 2.5V 3.3V 5V 12V
VIN=12V 33µH 33µH 33~47µH NA
VIN=24V 33µH 33µH 47µH 68µH
TS2596
Taiwan Semiconductor
6 Version: G1608
ELECTRICAL CHARACTERISTICS CURVES
(T
C
= 25°C unless otherwise noted)
Figure 1. Output Ripple
(V
IN
=12V, V
OUT
=5V, I
O
=3A)
Figure 2. Power On Test Wave
(V
IN
=12V, V
OUT
=5V, I
O
=3A)
Figure 3. Load Transient Response
(V
IN
=12V, V
OUT
=5V, I
O
=0.2~3A)
Figure 4. EN On Test Wave
(V
IN
=12V, V
OUT
=5V, I
O
=3A)
Figure 5. Efficiency
Figure 6. Efficiency
TS2596
Taiwan Semiconductor
7 Version: G1608
PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters)
TO-263-5L (D2PAK)
SUGGESTED PAD LAYOUT (Unit: Millimeters)
MARKING DIAGRAM
Y
= Year Code
M
= Month
Code for Halogen Free Product
O
=Jan
P
=Feb
Q
=Mar
R
=Apr
S
=May
T
=Jun
U
=Jul
V
=Aug
W
=Sep
X
=Oct
Y
=Nov
Z
=Dec
L
= Lot Code
XX
=
Voltage Code
(3.3=3.3V, 5.0=5V)
=
Package Code for Adjustable type
(CM5 = TO-263-5L)
TS2596
Taiwan Semiconductor
8 Version: G1608
Notice
Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf,
assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, to
any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of
sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty,
relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose,
merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify TSC for any damages resulting from such improper use or sale.