TS39301/2/3/4 1-7 2005/12 rev. A
TS39301/2/3/4
3A Ultra Low Dropout Positive Voltage Regulator
Low Dropout Voltage 0.4V (typ.)
Output Current 3A
Low Quiescent Current
General Description
The TS39301/2/3/4 are 3A ultra low dropout linear voltage regulators that provide low voltage, high current output with
a minimum of external components. The TS39301/2/3/4 offers extremely low dropout (typically 400mV at 3A) and low
quiescent current (typically 36mA at 3A).
The TS39301/2/3/4 is ideal for PC add-in cards that need to convert from standard 3.3V to 2.5V or 2.5V to 1.8V. A
guaranteed maximum dropout voltage of 500mV over all operating conditions allows the TS39301/2/3/4 to provide
2.5V from a supply as low as 3V, and 1.8V from a supply as low as 2.5V. The TS39301/2/3/4 also has fast transient
response for heavy switching applications. The device requires only 47uF of output capacitor to maintain stability and
achieve fast transient response.
On the TS39301/2/3/4, the enable pin may be tied to input voltage if it is not required for enable control. This series
are offered in 5-pin TO-220, TO-263 package.
Features
Dropout voltage typically 0.4V @Io=3A
Output current up to 3A
Low ground current
Current limiting and Thermal shutdown
Extremely fast transient response
Reversed leakage protection
Reverse battery protection
TTL/CMOS compatible enable pin
Error flag output (TS39301 only)
Adjustable version (TS39302 only)
Output voltage sense (TS39303 / 4 only)
Ordering Information
Note: Where xx denotes voltage option, available are
50 = 5.0V
33 = 3.3V
25 = 2.5V
18 = 1.8V
Part No.
Operating Temp.
Package
TS39301CZ5xx
TS39302CZ5
TS39303CZ5xx
TS39304CZ5xx
TO-220-5L
TS39301CM5xx
TS39302CM5
TS39303CM5xx
TS39304CM5xx
-40 ~ +125 oC
TO-263-5L
Applications
Battery power equipment
LDO linear regulator for PC add-in cards
PowerPCTM power supplies
Multimedia and PC processor supplies
High efficiency linear power supplies
High efficiency post regulator for switching supply
Low-voltage microcontrollers and digital logic
SMPS post regulator
TS39301/2/3/4 2-7 2005/12 rev. A
Absolute Maximum Rating (Note 1)
Supply Voltage
Vin
-20V ~ +20
V
Enable Voltage
Ven
+20
V
Storage Temperature Range
T
STG
-65 ~ +150
o
C
Lead Soldering Temperature (260 oC)
5
S
ESD (Note 3)
Operating Rating (Note 2)
Operation Input Voltage
Vin (operate)
+2.5 ~ +16
V
Operation Enable Voltage
Ven (operate)
+16
V
Power Dissipation (Note 4)
PD
Internally Limited
W
Operating Junction Temperature Range
TJ
-40 ~ +125
o
C
Electrical Characteristics
(Vin = Vout + 1V, Venable= 2.4V, Tj = 25 oC, unless otherwise specified.)
Parameter
Conditions
Min
Typ
Max
Unit
Output Voltage
IL=10mA
0.990|Vo|
1.010|Vo|
Output Voltage
10mA ≤ IL ≤ 3A,
Vo+1V ≤ Vin ≤ 8V
0.980|Vo|
5.0 / 3.3
2.5 / 1.8
1.020|Vo|
V
Line Regulation
IL=10mA, Vo+1V ≤Vin≤ 8V
--
0.06
0.5
%
Load Regulation
Vin=Vout+1V, 10mA≤IL≤3A
--
0.2
1.0
%
Output Voltage Temp. Coefficient
(Note 5)
--
40
100
ppm/ oC
Dropout Voltage (Note 6 & 8)
ΔVout= -1%
IL=100mA
IL=750mA
IL=1.5A
IL=3.0A
--
--
--
--
65
185
250
400
200
--
--
550
mV
Quiescent Current (Note 7)
Vin=Vout+1V
IL=100mA
IL=750mA
IL=1.5A
IL=3.0A
--
--
--
--
6
10
17
45
10
20
--
--
mA
Current Limited
Vout=0, Vin=Vout+1V
--
4.5
--
A
Enable Input (TS39301/2/3/4)
Low (OFF)
--
--
0.8
Input Logic Voltage
High (ON)
2.25
--
--
V
VEN=2.25V
--
--
75
Enable Pin Input Current
VEN =0.8V
--
--
4
µA
Shutdown Output Current (Note 8)
--
--
20
µA
Adjustable Output (TS39302)
Reference Voltage
0.980|Vo|
1.24
1.020|Vo|
V
TS39301/2/3/4 3-7 2005/12 rev. A
Electrical Characteristics
Flag Output (TS39301)
Output Leakage Current
VOH=16V
--
-- 2 µA
Output Low Voltage (Note 9)
Vin=2.5V, IOL=250uA
--
--
400
mV
Upper Threshold Voltage
% of Vout
--
--
99
%
Lower Threshold Voltage
% of Vout
93
--
--
%
Hysteresis
-- 1 --
%
Thermal Performance
Condition
Package type
Typ
Unit
TO-220-5L
2
Thermal Resistance
Junction to Case
TO-263-5L
2
o
C/W
Note 1. Exceeding the absolute maximum ratings may be damaged the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended.
Note 4. Pd
(max)
= (Tj
(max)
- Ta) + Өja, where Өja depends upon the printed circuit layout. See ”Applications
Information”.
Note 5. Output voltage temperature coefficient is ΔVout
(worst case)
+ (Tj
(max)
– Tj
(min)
) where Tj
(max)
is +125 oC and
Tj
(min)
is -40 oC.
Note 6. Vdrop = Vin - Vout when Vout decreases to 99% of its nominal output voltage with Vin = Vout + 1. For output
voltages below 2.5V, dropout voltage is the input-to-output voltage differential with the minimum input voltage
being 2.5V. Minimum input operating voltage is 2.5V
Note 7. Ignd is the quiescent current. Iin = Ignd + Iout
Note 8. Ven<0.8V, Vin<8V and Vout=0
Note 9. For 1.8V device, Vin = 2.25V (device is in dropout)
Block Diagram
TS3930x series
* Feedback network is fixed output versions only (TS39301 & TS39303 & TS39304)
** Adjustable output version only (TS39302)
TS39301/2/3/4 4-7 2005/12 rev. A
Pin Assignment
Pin No.
TS39301
TS39302
TS39303
TS39304
Pin
Configuration
Pin Description
1 1 1 2 Enable
TTL/COMS compatible input. Logic high is
enable; logic low or open is shutdown
2 2 2 1 Input
Unregulated input: +16V maximum supply
3 3 3 3 Ground
Ground pin and TAB/heatsink are internally
connected.
4 4 4 5 Output
Regulator output
5 Flag
Open-collector output. Active low indicates
an output fault condition.
5 Adjust
Feedback input. Connect to resistive
voltage-divider network.
5 4 Sense
Sense pin is the input to the error amplifier
Typical Application Circuit
TS39301
TS39302
TS39303 / 4
TS39301/2/3/4 5-7 2005/12 rev. A
Application Information
Application Information
The TS39300/1/2/3/4 series are high performance with
low dropout voltage regulator suitable for moderate to
high current and voltage regulator application. Its
630mV dropout voltage at full load and over
temperature makes it especially valuable in battery
power systems and as high efficiency noise filters in
post regulator applications. Unlike normal NPN
transistor design, where the base to emitter voltage
drop and collector to emitter saturation voltage limit the
minimum dropout voltage, dropout performance of the
PNP output of these devices is limited only by low Vce
saturation voltage.
The TS39300/1/2/3/4 series is fully protected from
damage due to fault conditions. Linear current limiting is
provided. Output current during overload conditions is
constant. Thermal shutdown the device when the die
temperature exceeds the maximum safe operating
temperature. Transient protection allows device survival
even when the input voltage spikes above and below
nominal. The output structure of these regulators allows
voltages in excess of the desired output voltage to be
applied without reverse current flow.
Output Capacitor Requirement
The TS39300/1/2/3/4 series requires an output
capacitor to maintain stability and improve transient
response is necessary. The value of this capacitor is
dependent upon the output current, lower currents allow
smaller capacitors. TS39300/1/2/3/4 series output
capacitor selection is dependent upon the ESR of the
output capacitor to maintain stability. When the output
capacitor is 47uF or greater, the output capacitor
should have an ESR less than 1Ω. This will improve
transient response as well as promote stability. Ultra
low ESR capacitors, such as ceramic chip capacitors,
may promote instability. These very low ESR levels
may cause an oscillation and/or under damped
transient response. A low ESR solid tantalum capacitor
works extremely well and provides good transient
response and stability over temperature aluminum
electrolytes can also be used, as long as the ESR of
the capacitor is <1Ω.
The value of the output capacitor can be increased
without limit. Higher capacitance values help to
improve transient response and ripple rejection and
reduce output noise.
Input Capacitor Requirement
An input capacitor of 1uF or greater is recommended
when the device is more than 4” away from the bulk
AC supply capacitance or when the supply is a battery.
Small, surface mount, ceramic chip capacitors can be
used for bypassing. Larger values will help to improve
ripple rejection by bypassing the input to the regulator,
further improving the integrity of the output voltage.
Minimum Load Current
The TS39130/1/2/3/4 series is specified between finite
loads. If the output current is too small leakage
currents dominate and the output voltage rises. A
10mA minimum load current is necessary for proper
regulation.
Adjustable Regulator Design
The adjustable regulator versions (TS39302) is allow
to programming the output voltage anywhere between
1.25 and the 16V maximum operating rating of the
family.
Two resistors are used. Resistors can be quite large
up to 1MΩ, because of the very high input impedance
and low bias current of the sense comparator, the
resistor values are calculated by:
R1 = R2 * [(Vout / 1.24) – 1]
Where Vout is the desired output voltage. Above
application circuit shows component definition.
Applications with widely varying load currents may
scale the resistors to draw the minimum load current
required for proper operation.
TS39301/2/3/4 6-7 2005/12 rev. A
Application Information (continues)
Error Flag
TS39301 versions feature an Error Flag, which looks
at the output voltage and signals an error condition
when this voltage drops 5% below its expected value.
The error flag is an open-collector output that pulls low
under fault conditions. It may sink 10mA. Low output
voltage signifies a number of possible problems,
including an over-current fault (the device is in current
limit) or low input voltage. The flag output is
inoperative during over temperature shutdown
conditions. A pull-up resistor from error flag to either
Vin or Vout is required for proper operation. For
information regarding the minimum and maximum
values of pull-up resistance, refer the graph as follow:
When the error flag is not used, it is best to leave
it open, the error flag pin can be tied directly to output
Pin.
Enable Input
TS39301/2/3/4 versions feature an active-high enable
(EN) input that allows ON/OFF control of the regulator.
Current drain reduces to “zero” when the device is
shutdown, with only micro-amperes of leakage current.
The EN input has TTL/CMOS compatible thresholds
for simple interfacing with logic interfacing. EN may be
directly tied to Vin and pulled up to the maximum
supply voltage.
Transient Response and 3.3V to 2.5V
or 2.5V to 1.8V Conversion
TS39301/2/3/4 has excellent transient response to
variations in input voltage and load current.
The device have been designed to respond quickly to
load current variations and input voltage variations.
Large output capacitors are not required to obtain this
performance. A standard 47uF output capacitor,
preferably tantalum, is all that is required. Larger values
help to improve performance even further.
By virtue of its low dropout voltage, this device does not
saturate into dropout as readily as similar NPN base
designs. When converting from 3.3V to 2.5V or 2.5V to
1.8V, the NPN based regulators are already operating
in dropout, with typical dropout requirements of 1.2V or
greater,. To convert down to 2.5V or 1.8V without
operating in dropout, NPN based regulators require an
input voltage of 3.7V at the very least.
The TS39300 series regulator will provide excellent
performance with an input as low as 3.0V or 2.5V
respectively. This gives the PNP based regulators a
distinct advantage over older, NPN based linear
regulators.
Power Dissipation
Determine the power dissipation requirements for the
design along with the maximum ambient temperature at
which the device will be operated.
Pd = (Vin- Vout) * Iout + Vin * Ignd
The heat sink thermal resistance is determined by:
Өsa = [Tj(max) – Ta] / Pd – (Өjc + Өcs)
When Tj(max) < 125 oC, and Өcs is between 0 oC and 2
o
C/W, the heat sink may be significantly reduced in
applications where the input voltage is known and large
compare with the dropout voltage.
Output Sense
Sense pin can be connect to the load and traces the
load voltage, TS39303/4 will adjust the output voltage to
maintain the load at expected voltage.
TS39301/2/3/4 7-7 2005/12 rev. A
TO-220-5L Mechanical Drawing
TO-220-5L DIMENSION
MILLIMETERS
INCHES
DIM
MIN
MAX
MIN
MAX
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
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-263-5L Mechanical Drawing
TO-263-5L DIMENSION
MILLIMETERS
INCHES
DIM
MIN
MAX
MIN
MAX
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
C
D
B
F
E
A
N
L
I
K
J
M
H
G
N
L
I
K
J
M
H
G
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