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www.ti.com
PTH08080W
SLTS235C – FEBRUARY 2005 – REVISED FEBRUARY 2008
2.25-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR
1
FEATURES
Up to 2.25-A Output Current at 85°C
4.5-V to 18-V Input Voltage Range
Wide-Output Voltage Adjust
(0.9 V to 5.5 V)
Efficiencies Up To 93%
On/Off Inhibit
Undervoltage Lockout (UVLO)
Output Overcurrent Protection
(Nonlatching, Auto-Reset)
Overtemperature Protection
Ambient Temperature Range: –40°C to 85°C
Surface-Mount Package
•
•
•
•
•
•
•
•
•
•
•
Safety Agency Approvals:
UL/CUL 60950, EN60950
APPLICATIONS
•
Telecommunications, Instumentation,
and General-Purpose Circuits
DESCRIPTION
The PTH08080W is a highly integrated, low-cost switching regulator module that delivers up to 2.25 A of output
current. The PTH08080W sources output current at a much higher efficiency than a TO-220 linear regulator IC,
thereby eliminating the need for a heat sink. Its small size (0.5
×
0.6 in) and flexible operation creates value for a
variety of applications.
The input voltage range of the PTH08080W is from 4.5 V to 18 V, allowing operation from either a 5-V or 12-V
input bus. Using state-of-the-art switched-mode power-conversion technology, the PTH08080W can step down to
voltages as low as 0.9 V from a 5-V input bus, with less than 1 W of power dissipation. The output voltage can
be adjusted to any voltage over the range, 0.9 V to 5.5 V, using a single external resistor. Operating features
include an undervoltage lockout (UVLO), on/off inhibit, overcurrent protection, and overtemperature protection.
Target applications include telecommunications, test and measurement applications, and high-end consumer
products. This product is available in both through-hole and surface-mount package options, including tape and
reel.
STANDARD APPLICATION
Inhibit
D1
$
5
4
R
SET
#
0.05 W, 1%
(Required)
V
O
C
O
*
100
m
F
Electrolytic
(Optional)
GND
PTH08080W
(Top View )
V
I
1
3
2
+
GND
C
I
*
100
m
F
Electrolytic
(Required)
* See The Capacitor Application Information
# See the Specification Table for the R
SET
value.
$ Diode is Required When V
O
> 5.25 V and V
I
> 16 V.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2008, Texas Instruments Incorporated
PTH08080W
SLTS235C – FEBRUARY 2005 – REVISED FEBRUARY 2008
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see
the TI website at www.ti.com.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted
(1)
PTH08080W
T
A
Operating free-air
temperature
Wave Solder
temperature
T
S
Solder reflow
temperature
Surface temperature of module body or pins
Over V
I
range
Suffix AH
Suffix AD
Suffix AS
Suffix AZ
–40 to 85
235
260
235
260
–55 to 125
°C
°C
UNIT
°C
T
stg
Storage temperature
(1)
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
MIN
V
I
T
A
Input voltage
Operating free-air temperature
4.5
–40
MAX
18
85
UNIT
V
°C
PACKAGE SPECIFICATIONS
PTH08080W (Suffix AH and AS)
Weight
Flammability
Mechanical shock
Mechanical vibration
(1)
Qualification limit.
Meets UL 94 V-O
Per Mil-STD-883D, Method 2002.3, 1 ms, 1/2 sine, mounted
Mil-STD-883D, Method 2007.2, 20-2000 Hz
500 G
20 G
(1)
(1)
1.5 grams
2
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Product Folder Link(s) :PTH08080W
Copyright © 2005–2008, Texas Instruments Incorporated
www.ti.com
PTH08080W
SLTS235C – FEBRUARY 2005 – REVISED FEBRUARY 2008
ELECTRICAL CHARACTERISTICS
at 25°C free-air temperature, V
I
= 12 V, V
O
= 3.3 V, I
O
= I
O
max, C
I
= 100 µF, C
O
= 100 µF (unless otherwise noted)
PARAMETER
I
O
P
O
Output current
Output power
Set-point voltage tolerance
Temperature variation
V
O
Line regulation
Load regulation
Total output voltage variation
V
ADJ
V
I
Output Voltage Adjust Range
TEST CONDITIONS
T
A
= 85°C, natural convection airflow
T
A
= 85°C, natural convection airflow
T
A
= 25°C
-40
≤
T
A
≤
+85°C
Over V
I
range
Over I
O
range
Includes set-point, line, load, -40
≤
T
A
≤
+85°C
Over I
O
range
0.9 V
≤
V
O
≤
1.8 V
Input Voltage Range
Over V
O
range
1.8 V < V
O
≤
3.4 V
3.4 V < V
O
≤
5.5 V
R
SET
= 348
Ω,
V
O
= 5 V
R
SET
= 1.87 kΩ, V
O
= 3.3 V
R
SET
= 3.74 kΩ, V
O
= 2.5 V
η
Efficiency
T
A
= 25°C,
I
O
= 2 A
R
SET
= 6.19 kΩ, V
O
= 2 V
R
SET
= 8.06 kΩ, V
O
= 1.8 V
R
SET
= 13 kΩ, V
O
= 1.5 V
R
SET
= 27.4 kΩ, V
O
= 1.2 V
Output voltage ripple
I
O
(trip)
Overcurrent threshold
20 MHz bandwith
Reset, followed by autorecovery
C
O
= 100 µF, 1
A/µs load step
from 50% to 100%
I
O
max
V
I
= increasing
V
I
= decreasing
Input high voltage (V
IH
)
Inhibit control (pin 5)
Input low voltage (V
IL
)
Input low current (I
IL
)
I
I
(stby)
f
S
Input standby current
Switching frequency
External input capacitance
Pins 5 and 2 connected
Over V
I
and I
O
ranges
Electrolytic type (C
I
)
Ceramic type (C
O
)
External output capacitance
Nonceramic type (C
O
)
Equivalent series resistance (nonceramic)
MTBF
Calculated reliability
Per Telcordia SR-332, 50% stress,
T
A
= 40°C, ground benign
10
(7)
(4)
MIN
0
TYP
MAX
2.25
10
2
(1)
UNIT
A
W
%
%V
o
mV
%V
o
0.5
7
0.13
3
0.9
4.5
4.5
V
O
+ 1.1
(2)
(1)
%V
o
V
5.5
V
O
x 10
(2)
18
18
93.5%
92%
91%
90%
89%
87.5%
86.5%
30
3.5
(2)
V
mV
PP
A
µs
mV
4.5
(3)
Recovery time
V
O
over/undershoot
50
70
4.35
3.6
4
Open
–0.2
5
1
300
100
Transient response
UVLO
Undervoltage lockout
V
0.5
V
µA
mA
kHz
µF
220
100
(5)
330
(6)
µF
mΩ
10
6
Hr
48
(1)
(2)
(3)
(4)
(5)
(6)
(7)
The set-point voltage tolerance is affected by the tolerance and stability of R
SET
. The stated limit is unconditionally met if R
SET
has a
tolerance of 1% with 100 ppm/°C or better temperature stability.
The minimum input voltage is 4.5 V or (V
O
+ 1.1) V, whichever is greater. The maximum input voltage is 18 V or V
O
×
10, whichever is
less.
This control pin has an internal pull-up to 3 V (TYP). Do not place an internal pull-up on this pin. If it is left open-circuit, the module
operates when input power is applied. A small low-leakage (< 100 nA) MOSFET is recommended for control. See the application
information for further guidance.
An external 100-µF electrolytic capacitor is required across the input (V
I
and GND) for proper operation. Locate the capacitor close to
the module.
An external 100-µF electrolytic capacitor is optional across the output (V
O
and GND). Locate the capacitor close to the module.
Additional capacitance close to the load improves the response of the regulator to load transients.
This is the calculated maximum capacitance. The minimum ESR limitation often results in a lower value. See the capacitor application
information for further guidance.
This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 14 mΩ as the minimum when calculating the total
equivalent series resistance (ESR) using the maximum ESR values specified by the capacitor manufacturer.
Copyright © 2005–2008, Texas Instruments Incorporated
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3
PTH08080W
SLTS235C – FEBRUARY 2005 – REVISED FEBRUARY 2008
www.ti.com
PIN ASSIGNMENT
TERMINAL FUNCTIONS
TERMINAL
NAME
V
I
GND
V
O
NO.
1
2
3
O
I/O
I
DESCRIPTION
The positive input voltage power node to the module, which is referenced to common GND.
This is the common ground connection for the
V
I
and
V
O
power connections. It is also the 0-Vdc reference for
the
Inhibit
and
V
O
Adjust
control inputs.
The regulated positive power output with respect to the GND node.
A 1% resistor must be connected between this pin and GND (pin 1) to set the output voltage of the module
higher than 0.9 V. If left open-circuit, the output voltage defaults to this value. The temperature stability of the
resistor should be 100 ppm/°C (or better). The set-point range is from 0.9 V to 5.5 V. The electrical
specification table gives the standard resistor value for a number of common output voltages. See the
application information for further guidance.
The Inhibit pin is an open-collector/drain-negative logic input that is referenced to GND. Applying a low-level
ground signal to this input disables the module's output. When the Inhibit control is active, the input current
drawn by the regulator is significantly reduced. If the Inhibit pin is left open-circuit, the module produces an
output voltage whenever a valid input source is applied. Do not place an external pull-up on this pin.
V
O
Adjust
4
I
Inhibit
5
I
PIN
1
5
2
3
4
Figure 1. Terminal Location
4
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Product Folder Link(s) :PTH08080W
Copyright © 2005–2008, Texas Instruments Incorporated
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