1.5A Ultra Low Dropout Linear Regulator TJ3965A

1.5A Ultra Low Dropout Linear Regulator
TJ3965A
FEATURES
Ultra Low Dropout Voltage
Low Ground Pin Current
Excellent Line and Load Regulation
Guaranteed Output Current of 1.5A
Available in SOP8, SOP8-PP, SOT-223,
and SOT-89 Packages
z Fixed Output Voltages : 1.2V, 1.8V, 2.5V, 3.3V, and 5.0V
z SENSE Option Improves Load Regulation
z Over-Temperature/Over-Current Protection
z
z
z
z
z
SOP8 / SOP8-PP PKG
SOT-223 3L PKG
z -40℃ to 125℃ Junction Temperature Range
z Moisture Sensitivity Level 3
SOT-89 5L PKG
APPLICATION
z
z
z
z
z
z
Battery Powered Equipments
Motherboards and Graphic Cards
Microprocessor Power Supplies
Peripheral Cards
High Efficiency Linear Regulators
Battery Chargers
DESCRIPSION
The TJ3965A series of high performance ultra lowdropout linear regulators operates from 2.5V to 6V input
supply and provides ultra low-dropout voltage, high
output current with low ground current. Wide range of
preset output voltage options are available. These ultra
low dropout linear regulators respond fast to step change
ORDERING INFORMATION
Device
TJ3965AD-ADJ
TJ3965AD-X.X
TJ3965ADP-ADJ
TJ3965ADP-X.X
TJ3965AS-X.X
TJ3965AF-ADJ
TJ3965AF-X.X
Package
SOP8
SOP8-PP
SOT-223 3L
SOT-89 5L
X.X = Output Voltage = 1.2, 1.8, 2.5, 3.3, and 5.0.
Except for SOT-223, contact us for the other PKGs.
in load which makes them suitable for low voltage micro-processor applications. The TJ3965A is developed
on a CMOS process technology which allows low quiescent current operation independent of output load
current. This CMOS process also allows the TJ3965A to operate under extremely low dropout conditions.
Absolute Maximum Ratings
CHARACTERISTIC
SYMBOL
Input Supply Voltage (Survival)
VIN
Enable Input Voltage (Survival)
VEN
(1)
Maximum Output Current
IMAX
Lead Temperature (Soldering, 5 sec)
TSOL
MIN.
MAX.
UNIT
-0.3
6.5
V
-0.3
6.5
V
-
1.5
A
260
℃
Storage Temperature Range
TSTG
-65
150
℃
Operating Junction Temperature Range
TJOPR
-40
125
℃
(1) It is recommended for VEN voltage not to exceed VIN voltage.
Aug. 2009 – Rev.1.0
-1-
HTC
1.5A Ultra Low Dropout Linear Regulator
TJ3965A
Ordering Information
VOUT
Package
Order No.
Description
Supplied As
Status
1.2V
SOT-223 3L
TJ3965AS-1.2V-3L
1.5A
Reel
Contact us
1.8V
SOT-223 3L
TJ3965AS-1.8V-3L
1.5A
Reel
Contact us
2.5V
SOT-223 3L
TJ3965AS-2.5V-3L
1.5A
Reel
Active
3.3V
SOT-223 3L
TJ3965AS-3.3V-3L
1.5A
Reel
Contact us
5.0V
SOT-223 3L
TJ3965AS-5.0V-3L
1.5A
Reel
Contact us
* Except for SOT-223, contact us for the other PKGs.
TJ
3965A
Lead Count : 3L / 5L / 8L
Output Voltage : ADJ / 1.2V / 1.8V / 2.5V / 3.3V / 5.0V
D
DP
S
F
Package Type
: SOP8
: SOP8-PP
: SOT-223
: SOT-89
Root Name
Product Code
PIN CONFIGURATION
4
VIN
5
VOUT
SOP8 / SOP8-PP
SOT-223-3L
3
EN
2
GND
1
SENSE/ADJ
SOT-89-5L
PIN DESCRIPTION
Pin
No.
SOT-223 3LEAD
SOT-89 5LEAD
SOP8 / SOP8-PP 8LEAD
Name
Function
Name
Function
Name
Function
1
VIN
Input Supply
SENSE/ADJ
Remote Sense
or Output Adjust
EN
Chip Enable
2
GND
Ground
GND
Ground
VIN
Input Supply
3
VOUT
Output Voltage
EN
Chip Enable
VOUT
Output Voltage
4
-
-
VIN
Input Supply
SENSE/ADJ
Remote Sense
or Output Adjust
5/6/7/8
-
-
VOUT
Output Voltage
GND
Ground
Aug. 2009 – Rev.1.0
-5-
HTC
1.5A Ultra Low Dropout Linear Regulator
TJ3965A
TYPICAL APPLICATION
Typical 3 Pin Application
VIN
INPUT
CIN
68μF
VOUT
OUTPUT
TJ3965A
+
+ COUT
GND
- 33μF
-
Typical 5 / 8 Pin Application
VIN
INPUT
CIN
VOUT
OUTPUT
TJ3965A
+
EN
EN
68μF -
+ COUT
SENSE
GND
- 33μF
5 / 8 Pin Remote Load Sense Application
INPUT
VIN
TJ3965A
+
CIN
OUTPUT
VOUT
EN
EN
68μF -
+
SENSE
GND
L
O
A
D
COUT
- 33μF
Typical Adjustable Version Application
VIN
INPUT
CIN
TJ3965A
+
68μF -
VOUT
EN
EN
OUTPUT
R2
ADJ
GND
R1
+
COUT
- 33μF
* TJ3965A can deliver a continuous current of 1.5A over the full operating temperature. However, the output
current is limited by the restriction of power dissipation which differs from packages. A heat sink may be
required depending on the maximum power dissipation and maximum ambient temperature of application.
With respect to the applied package, the maximum output current of 1.5A may be still undeliverable.
* When a Pull-Up resistor is connected between VEN terminal and VEN Signal (or VIN line), the resistance of the
Pull-Up resistor should be kept under 10kΩ.
* See Application Information
Aug. 2009 – Rev.1.0
-5-
HTC
1.5A Ultra Low Dropout Linear Regulator
TJ3965A
ELECTRICAL CHARACTERISTICS(Note 1)
Limits in standard typeface are for TJ=25℃, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: VIN(Note 2) = VO(NOM) + 1 V, IL = 10 mA, CIN = 68 uF, COUT = 33 uF, VEN = VIN - 0.3 V
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
-1
-2
0
1
2
%
1.130
1.116
1.145
1.160
1.174
V
Output Voltage Tolerance
VO
10 mA < IL < 1.5 A
VOUT+1 V < VIN < 6 V
Adjustable Pin Voltage
(ADJ version)
VADJ
10 mA < IL < 1.5 A
VOUT+1.5 V < VIN < 6 V
Line Regulation(Note 3)
ΔVLINE
VOUT+1 V < VIN < 6 V
-
0.08
0.18
0.20
%/V
Load Regulation(Note 3, 4)
ΔVLOAD
10 mA < IL < 1.5 A
-
0.25
0.55
1.00
%
IL = 150 mA
-
40
55
65
(Note 5)
Dropout Voltage
VDROP
Ground Pin Current(Note 6)
mV
IL = 1.5 A
-
380
450
550
IL = 150 mA
-
30
55
75
IL = 1.5 A
-
30
55
75
VEN < 0.2 V
-
30
55
75
uA
IGND1
uA
Ground Pin Current(Note 7)
IGND2
Output Peak Current
IPEAK
2.0
1.7
2.2
-
A
Thermal Shutdown Temperature
TSD
-
165
-
℃
Thermal Shutdown Hysteresis
ΔTSD
-
10
-
℃
Logic Low
VIL
Output = Low
-
0
VIN
− 0.5
2
V
Logic High
VIH
Output = High
VIN
+ 0.5
2
VIN
-
V
IEN
VEN = VIN
-
0.05
2
uA
Enable threshold
Enable Input Current
Note 1. Stresses listed as the absolute maximum ratings may cause permanent damage to the device. These are for stress ratings. Functional
operating of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not
implied. Exposure to absolute maximum rating conditions for extended periods may remain possibly to affect device reliability.
Note 2. The minimum operating value for input voltage is equal to either (VOUT,NOM + VDROP) or 2.5V, whichever is greater.
Note 3. Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in the input line voltage.
Output voltage load regulation is defined as the change in output voltage from the nominal value due to change in load current.
Note 4. Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested for load regulation in the
load range from 10mA to 1.5A
Note 5. Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value.
Dropout voltage specification applies only to output voltages of 2.5V and above. For output voltages below 2.5V, the dropout voltage is
nothing but the input to output differential, since the minimum input voltage is 2.5V
Note 6. Ground current, or quiescent current, is the difference between input and output currents. It's defined by IGND1 = IIN - IOUT under the
given loading condition. The total current drawn from the supply is the sum of the load current plus the ground pin current.
Note 7. Ground current, or standby current, is the input current drawn by a regulator when the output voltage is disabled by an enable signal.
Aug. 2009 – Rev.1.0
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HTC
1.5A Ultra Low Dropout Linear Regulator
TJ3965A
TYPICAL OPERATING CHARACTERISTICS
Ambient Temperature vs. Output Voltage Change
Output Current vs. Dropout Voltage
Power Dissipation vs. Case Temperature, MSOP8
Power Dissipation vs. Case Temperature, SOP8
Power Dissipation vs. Case Temperature, SOP8-PP
Power Dissipation vs. Case Temperature, TO220
T.B.D.
Aug. 2009 – Rev.1.0
-7-
HTC
1.5A Ultra Low Dropout Linear Regulator
TJ3965A
APPLICATION INFORMATION
Output Adjustment (Adjustable Version)
An adjustable output device has output voltage range of 1.145V to 5.0V. To obtain a desired output
voltage, the following equation can be used with R1 resistor. The sum of R1 and R2 should be in range
of 1kΩ to 100kΩ
TJ3965A
⎛V
⎞
R 2 = R1⎜ OUT − 1⎟
1
.
145
⎝
⎠
To enhance output stability, a capacitor of 68pF to 100pF can be placed in series with VOUT and ADJ.
SENSE Pin
In applications where the regulator output is not very close to the load, the TJ3965A can provide better
remote load regulation characteristics using the SENSE pin. TJ3965A regulates the voltage at the
output pin. Hence, the voltage at the remote load will be lower than the voltage at the output pin as a
value of the voltage drop across the trace series resistance. If the sense option pin is not required, the
sense pin must be connected to the VOUT pin. Connecting the sense pin to the remote load will provide
regulation at the remote load because the TJ3965A regulates the voltage at the sense pin when the
sense option pin is used.
Maximum Output Current Capability
The TJ3965A can deliver a continuous current of 1.5A over the full operating junction temperature range.
However, the output current is limited by the restriction of power dissipation which differs from packages.
A heat sink may be required depending on the maximum power dissipation and maximum ambient
temperature of application. With respect to the applied package, the maximum output current of 1.5A
may be still undeliverable due to the restriction of the power dissipation of TJ3965A. Under all possible
conditions, the junction temperature must be within the range specified under operating conditions.
The temperatures over the device are given by:
TC = TA + PD X θCA
/ TJ = TC + PD X θJC / TJ = TA + PD X θJA
where TJ is the junction temperature, TC is the case temperature, TA is the ambient temperature, PD is the
total power dissipation of the device, θCA is the thermal resistance of case-to-ambient, θJC is the thermal
resistance of junction-to-case, and θJA is the thermal resistance of junction to ambient.
The total power dissipation of the device is given by:
PD = PIN – POUT = (VIN X IIN)–(VOUT X IOUT)
= (VIN X (IOUT+IGND)) – (VOUT X IOUT) = (VIN - VOUT) X IOUT + VIN X IGND
Aug. 2009 – Rev.1.0
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HTC
1.5A Ultra Low Dropout Linear Regulator
TJ3965A
where IGND is the operating ground current of the device which is specified at the Electrical Characteristics.
The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax)
of the application, and the maximum allowable junction temperature (TJmax):
TRmax = TJmax – TAmax
The maximum allowable value for junction-to-ambient thermal resistance, θJA, can be calculated using the
formula:
θJA = TRmax / PD = (TJmax – TAmax) / PD
TJ3965A is available in SOT-223, SOP8-PP, and SOT-89 packages. The thermal resistance depends on
amount of copper area or heat sink, and on air flow. If the maximum allowable value of θJA calculated
above is over 140°C/W for SO-223 package, over 165°C/W for SOP8 package, over 175°C/W for SOP8PP package, no heat sink is needed since the package can dissipate enough heat to satisfy these
requirements. If the value for allowable θJA falls near or below these limits, a heat sink or proper area of
copper plane is required.
In summary, the absolute maximum ratings of thermal resistances are as follow:
Absolute Maximum Ratings of Thermal Resistance
No heat sink / No air flow / No adjacent heat source / TA = 25°C
Characteristic
Symbol
Rating
Unit
165
°C/W
Thermal Resistance Junction-To-Ambient / SOP8
θJA-SOP8
Thermal Resistance Junction-To-Ambient / SOP8-PP
θJA-SOP8-PP
175
°C/W
Thermal Resistance Junction-To-Ambient / SOT-223
θJA-SOT223
140
°C/W
Thermal Resistance Junction-To-Ambient / SOT-89
θJA-SOT89
200
°C/W
In case that there is no cooling solution and no heat sink / copper plane area for heat sink, the maximum
allowable power dissipation of each package is as follow;
Characteristic
Symbol
Rating
Unit
Maximum Allowable Power Dissipation at TA=25°C / SOP8
PDMax -SOP8
0.606
W
Maximum Allowable Power Dissipation at TA=25°C / SOP8-PP
PDMax -SOP8-PP
0.571
W
Maximum Allowable Power Dissipation at TA=25°C / SOT-223
PDMax -SOT223
0.714
W
Maximum Allowable Power Dissipation at TA=25°C / SOT-89
PDMax –SOT89
0.500
W
- Please note that above maximum allowable power dissipation is based on the minimum copper
plane area which does not exceed the proper footprint of the package. And the ambient
temperature is 25°C.
Aug. 2009 – Rev.1.0
-9-
HTC
1.5A Ultra Low Dropout Linear Regulator
TJ3965A
If proper cooling solution such as heat sink, copper plane area, air flow is applied, the maximum
allowable power dissipation could be increased. However, if the ambient temperature is increased, the
allowable power dissipation would be decreased.
For example, in case of SOT-223 and TO-263 package, θJA-SOT-223 is 140 °C/W and θJA-TO263 is 80 °C/W,
however, as shown in below graph, θJA could be decreased with respect to the copper plane area. So,
the specification of maximum power dissipation for an application is fixed, the proper copper plane area
could be estimated by following graphs. As shown in graph, wider copper plane area leads lower θJA.
The maximum allowable power dissipation is also influenced by the ambient temperature. With the
above θJA-Copper plane area relationship, the maximum allowable power dissipation could be evaluated
with respect to the ambient temperature. As shown in graph, the higher copper plane area leads θJA.
And the higher ambient temperature leads lower maximum allowable power dissipation.
All this relationship is based on the aforesaid equation ; θJA = TRmax / PD = (TJmax – TAmax) / PD
T.B.D
Aug. 2009 – Rev.1.0
- 10 -
HTC