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TPS75715, TPS75718, TPS75725, TPS75733 WITH POWER GOOD AND
TPS75701 FAST TRANSIENT RESPONSE 3 A LOW DROPOUT
VOLTAGE REGULATORS
SLVS306E − NOVEMBER 2000 − REVISED FEBRUARY 2009
D
3-A Low-Dropout Voltage Regulator
D
Available in 1.5-V, 1.8-V, 2.5-V, and 3.3-V
D
D
D
D
D
D
D
Fixed-Output and Adjustable Versions
Open Drain Power-Good (PG) Status
Output (Fixed Options Only)
Dropout Voltage Typically 150 mV at 3 A
(TPS75733)
Low 125
µA
Typical Quiescent Current
Fast Transient Response
3% Tolerance Over Specified Conditions for
Fixed-Output Versions
Available in 5-Pin TO−220 and TO−263
Surface-Mount Packages
Thermal Shutdown Protection
EN
IN
GND
OUTPUT
FB/PG
TO−220 (KC) PACKAGE
(TOP VIEW)
1
2
3
4
5
TO−263 (KTT) PACKAGE
(TOP VIEW)
EN
IN
GND
OUTPUT
FB/PG
1
2
3
4
5
description
The TPS757xx family of 3-A low dropout (LDO) regulators contains four fixed voltage option regulators with
integrated power-good (PG) and an adjustable voltage option regulator. These devices are capable of supplying
3 A of output current with a dropout of 150 mV (TPS75733). Therefore, the device is capable of performing a
3.3-V to 2.5-V conversion. Quiescent current is 125
µA
at full load and drops down to less than 1
µA
when the
device is disabled. The TPS757xx is designed to have fast transient response for large load current changes.
TPS75733
DROPOUT VOLTAGE
vs
JUNCTION TEMPERATURE
250
IO = 3 A
VO = 3.3 V
VDO − Dropout Voltage − mV
200
∆
VO − Change in Output Voltage − mV
150
100
50
0
−50
TPS75715
LOAD TRANSIENT RESPONSE
VO = 1.5 V
Co = 100
µF
150
100
−100
di
+
0.75 A
ms
dt
4
2
0
−150
50
0
−40 −25 −10 5 20 35 50 65 80 95 110 125
TJ − Junction Temperature −
°C
0
20
40
60
80 100 120 140 160 180 200
t − Time −
µs
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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
2009, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
I O − Output Current − A
1
SLVS306E − NOVEMBER 2000 − REVISED FEBRUARY 2009
TPS75715, TPS75718, TPS75725, TPS75733 WITH POWER GOOD AND
TPS75701 FAST TRANSIENT RESPONSE 3 A LOW DROPOUT
VOLTAGE REGULATORS
description (continued)
Because the PMOS device behaves as a low-value resistor, the dropout voltage is low (typically 150 mV at an
output current of 3 A for the TPS75733) and is directly proportional to the output current. Additionally, since the
PMOS pass element is a voltage-driven device, the quiescent current is low and independent of output loading
(typically 125
µA
over the full range of output current). These two key specifications yield a significant
improvement in operating life for battery-powered systems.
The device is enabled when EN is connected to a low-level voltage. This LDO family also features a sleep mode;
applying a TTL high signal to EN (enable) shuts down the regulator, reducing the quiescent current to less than
1
µA
at T
J
= 25°C. The power-good terminal (PG) is an active low, open drain output, which can be used to
implement a power-on reset or a low-battery indicator.
The TPS757xx is offered in 1.5-V, 1.8-V, 2.5-V, and 3.3-V fixed-voltage versions and in an adjustable version
(programmable over the range of 1.22 V to 5 V). Output voltage tolerance is specified as a maximum of 3% over
line, load, and temperature ranges. The TPS757xx family is available in a 5-pin TO−220 (KC) and TO−263 (KTT)
packages.
AVAILABLE OPTIONS
TJ
OUTPUT VOLTAGE
(TYP)
3.3 V
2.5 V
−40 C 125 C
−40°C to 125°C
1.8 V
1.5 V
Adjustable 1.22 V to 5 V
TO−220 (KC)
TPS75733KC
TPS75725KC
TPS75718KC
TPS75715KC
TPS75701KC
TO−263(KTT)
TPS75733KTT
TPS75725KTT
TPS75718KTT
TPS75715KTT
TPS75701KTT
NOTE: The TPS75701 is programmable using an external resistor divider (see application
information). The KTT package is available taped and reeled. Add an R suffix to the
device type (e.g., TPS75701KTTR) to indicate tape and reel.
VI
2
IN
PG
5
PG
OUT
1
µF
1
EN
4
VO
Co
†
47
µF
+
GND
3
† See application information section for capacitor selection details.
Figure 1. Typical Application Configuration (For Fixed Output Options)
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TPS75715, TPS75718, TPS75725, TPS75733 WITH POWER GOOD AND
TPS75701 FAST TRANSIENT RESPONSE 3 A LOW DROPOUT
VOLTAGE REGULATORS
SLVS306E − NOVEMBER 2000 − REVISED FEBRUARY 2009
functional block diagram—adjustable version
VIN
UVLO
Current
Sense
ILIM
GND
EN
_
SHUTDOWN
R1
+
FB
UVLO
R2
VOUT
Thermal
Shutdown
Vref = 1.22 V
External to
the Device
VIN
Bandgap
Reference
functional block diagram—fixed version
VIN
UVLO
Current
Sense
ILIM
_
GND
UVLO
EN
R2
SHUTDOWN
R1
+
VOUT
Thermal
Shutdown
Vref = 1.22 V
VIN
Bandgap
Reference
Falling
Edge Delay
PG
Terminal Functions (TPS757xx)
TERMINAL
NAME
EN
FB/PG
GND
IN
OUTPUT
Thermal Pad
NO.
1
5
3
2
4
−
I
O
I/O
I
I
Enable input
Feedback input voltage for adjustable device/PG output for fixed options
Regulator ground
Input voltage
Regulated output voltage
Connect to GND or Float
DESCRIPTION
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
SLVS306E − NOVEMBER 2000 − REVISED FEBRUARY 2009
TPS75715, TPS75718, TPS75725, TPS75733 WITH POWER GOOD AND
TPS75701 FAST TRANSIENT RESPONSE 3 A LOW DROPOUT
VOLTAGE REGULATORS
TPS757xx PG timing diagram
VIN1
VUVLO
VUVLO
t
VOUT
Threshold
Voltage
VIT −
(see Note A)
t
PG
Output
VIT +(see Note A)
t
NOTE: VIT −Trip voltage is typically 9% lower than the output voltage (91%VO). VIT− to VIT+ is the hysteresis voltage.
detailed description
The TPS757xx family includes four fixed-output voltage regulators (1.5 V, 1.8 V, 2.5 V, and 3.3 V), and an
adjustable regulator, the TPS75701 (adjustable from 1.22 V to 5 V). The bandgap voltage is typically 1.22 V.
pin functions
enable (EN)
The EN terminal is an input which enables or shuts down the device. If EN is a logic high, the device will be in
shutdown mode. When EN goes to logic low, the device will be enabled.
power-good (PG)
The PG terminal for the fixed voltage option devices is an open drain, active low output that indicates the status
of V
O
(output of the LDO). When V
O
reaches approximately 91% of the regulated voltage, PG will go to a low
impedance state. It will go to a high-impedance state when V
O
falls below approximately 89% (i.e. over load
condition) of the regulated voltage. The open drain output of the PG terminal requires a pullup resistor.
feedback (FB)
FB is an input terminal used for the adjustable-output option and must be connected to the output terminal either
directly, in order to generate the minimum output voltage of 1.22 V, or through an external feedback resistor
divider for other output voltages. The FB connection should be as short as possible. It is essential to route it in
such a way to minimize/avoid noise pickup. Adding RC networks between FB terminal and V
O
to filter noise is
not recommended because it may cause the regulator to oscillate.
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
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