TJ49150
1.5A Very Low Input / Output Voltage
Ultra Low Dropout Linear Regulator
FEATURES
Ultra Low Dropout Voltage
Low Quiescent Current
Excellent Line and Load Regulation
Guaranteed Output Current of 1.5A
Available in SOP-8, SOP-8-PP, TO-252-5L Packages
Adjustable Output Voltage Down to 0.8V
Logic Controlled Shutdown Option
Over-Temperature/Over-Current Protection
-40°C to 125°C Junction Temperature Range
SOP-8 / SOP-8-PP
TO252-5L
APPLICATIONS
Motherboards and Graphic Cards
Microprocessor Power Supplies
Peripheral Cards
Low Voltage Digital ICs
High Efficiency Linear Regulators
SMPS Post Regulators
ORDERING INFORMATION
DESCRIPSION
The TJ49150 is a series of 1.5A high performance ultra
low dropout linear regulator ideal for powering core
voltages of low-power microprocessors.
The
TJ49150 implements a dual supply configuration
allowing for very low output impedance. The
TJ49150 requires a bias input supply and a main input
supply, allowing for very low input voltages on the
main supply rail. The input supply operates from
1.2V to 5.5V and the bias supply requires between
3.0V and 5.5V for proper operation. The TJ49150
offers adjustable output voltages down to 0.8V. The
TJ49150 is developed on a CMOS technology which
allows low quiescent current operation independent
of output current. This technology also allows the
TJ49150 to operate under extremely low dropout
conditions.
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Device
Package
TJ49150GD
SOP-8
TJ49150GDP
SOP-8-PP
TJ49150GRS
TO-252-5L
HTC
TJ49150
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTIC
SYMBOL
MIN.
MAX.
UNIT
Input Supply Voltage (Survival)
VIN
-0.3
6
V
Bias Supply Voltage (Survival)
VBIAS
-0.3
6
V
Enable Input Voltage (Survival)
VEN
-0.3
6
V
Output Voltage (Survival)
VOUT
-0.3
VIN +0.3
V
Lead Temperature (Soldering, 5 sec)
TSOL
260
°C
Storage Temperature Range
TSTG
-65
150
°C
SYMBOL
MIN.
MAX.
UNIT
Input Supply Voltage
VIN
1.2
5.5
V
Bias Supply Voltage
VBIAS
3.0
5.5
V
Enable Input Voltage
VEN
0
VBIAS
V
Ambient Temperature Range
TAOPR
-40
105
°C
Operating Junction Temperature Range
TJOPR
-40
125
°C
θJC
θJA
UNIT
RECOMMENDED OPERATING RATINGS
CHARACTERISTIC
THERMAL INFORMATION
THERMAL METRIC
°C/W
Thermal Resistance (SOP-8) *
Thermal Resistance (SOP-8-PP) *
15
Thermal Resistance (TO-252-5L) *
*
75
°C/W
68
°C/W
Calculated from package in still air, mounted to minimum foot print(2.5mm x 3.0mm) PCB.
ORDERING INFORMATION
VOUT
ADJ
December 2012
Package
Order No.
Description
SOP-8
TJ49150GD
1.5A,
Adjustable,
SOP-8-PP
TJ49150GDP
1.5A,
Adjustable,
TO-252 5L
TJ49150GRS
1.5A,
Marking
Compliance
Status
Enable
TJ49150G
RoHS, Green
Contact Us
Enable
TJ49150G
RoHS, Green
Active
TJ49150G
RoHS, Green
Contact Us
Adjustable
2
HTC
TJ49150
PIN CONFIGURATION
SOP-8 / SOP-8-PP
TO-252-5L
TAB
ADJ
GND
IN
NC
Thermal
Exposed
PAD
OUT
NC
EN
BIAS
ADJ
BIAS
GND
IN
OUT
PIN DESCRIPTION
Pin No.
Pin Name
Pin Function
SOP-8
SOP-8-PP
TO252-5L
1
1
1
ADJ
2
2
2
IN
8
8
3
GND
Reference Ground.
3
3
4
OUT
Power Output.
4
4
5
BIAS
Input Bias Voltage for powering all circuitry on
the regulator except the output power TR.
5
5
-
EN
Chip Enable (SOP-8/SOP-8-PP Only).
6, 7
6, 7
-
NC
No Connection.
-
Exposed PAD
TAB
Thermal Exposed PAD / TAB
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Output Adjust for Adjustable Output.
Power Input.
Connect to ground.
HTC
TJ49150
BLOCK DIAGRAM
IN
BIAS
Over
Current
Protection
GRS
Enable
EN
Bandgap
Reference
GD/GDP
ADJ
Thermal
Protection
OUT
GND
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TJ49150
TYPICAL APPLICATION
VIN
IN
VEN
REN
VBIAS
EN
BIAS
CVIN
VBIAS
CVIN
IN
OUT
BIAS
ADJ
IN
VEN
REN
VBIAS
R1
REN
VBIAS
GND
CVBIAS
R2
VOUT
OUT
CFF
EN
BIAS
CVIN
COUT
ADJ
IN
VEN
VOUT
EN
CVBIAS
VIN
COUT
OUT
BIAS
CVIN
VOUT
GND
CVBIAS
VIN
COUT
ADJ
GND
CVBIAS
VIN
VOUT
OUT
R1
COUT
ADJ
GND
R2
* See application information for the details over external capacitor.
** TJ49150 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.
*** For the details, see Application Information.
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TJ49150
ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for TJ=25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: VBIAS = VO(NOM.) + 2.1V, VIN = VO(NOM.) + 1V, VEN=VBIAS, IL = 10 mA.
PARAMETER
SYMBOL
Adjustable Pin Voltage
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
0.784
0.776
0.8
0.816
0.824
V
VADJ
VOUT+1 V < VIN < 5.5 V
Line Regulation(Note 1)
ΔVLINE
VOUT+1 V < VIN < 5.5 V
0.02
0.1
%/V
Load Regulation(Note 1, 2)
ΔVLOAD
10 mA < IL < 1.5 A
0.25
1.0
%
IL = 0.75 A
120
160
200
IL = 1.5 A
240
320
400
Dropout Voltage(Note 2)
VDROP
mV
Dropout Voltage(Note 2)
VDROP
IL = 1.5 A , VBIAS = 5.0 V
200
270
340
mV
Dropout Voltage(Note 3)
VDROP
IL = 1.5 A
1.5
2.1
V
Bias Pin Current
IBIAS
IL = 1.5 A
300
450
600
μA
Ground Pin Current(Note 4)
IGND1
IL = 10 mA
300
450
600
μA
Ground Pin Current(Note 4)
IGND2
VEN < 0.2 V
0.1
0.5
1.0
μA
Current Limit
ICL
2.5
A
Thermal Shutdown Temperature
TSD
155
°C
ΔTSD
30
°C
Thermal Shutdown Hysteresis
Logic Low
VENL
Output = Low
Logic High
VENH
Output = High
0.4
V
Enable threshold
(Note 5)
2.0
V
Enable Pin Input Current(Note 5)
IEN
VEN = VBIAS
0.1
1.0
μA
Adjust Pin Current
IADJ
VADJ = 0.8 V
0.1
1.0
μA
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
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.
Regulation is measured at constant junction temperature by using a 10ms current pulse. Devices are tested for load regulation in
the load range from 10mA to 1.5A.
For VOUT ≤ 1.0V, the VBIAS Dropout specification does not apply due that the minimum VBIAS input is 3.0V.
IGND = IBIAS + (IIN – IOUT). The total current drawn from the supply is the sum of the load current plus the ground current.
SOP-8/SOP-8-PP packages only.
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TJ49150
TYPICAL OPERATING CHARACTERISTICS
0.9
1.4
0.8
1.2
0.6
OUTPUT VOLTAGE [V]
OUTPUT VOLTAGE [V]
0.7
0.5
0.4
0.3
0.2
1
0.8
IOUT=0.1A
0.6
IOUT=1.5A
0.4
0.2
0.1
0
0
0
1
2
3
4
0
5
1
2
3
4
5
INPUT VOLTAGE [V]
INPUT VOLTAGE [V]
Reference Voltage vs. VIN
Output Voltage vs. VIN
400
DROPOUT VOLTAGE [mV]
350
300
VBIAS = 3.3V
250
VBIAS = 5.0V
200
150
100
50
0
0
0.5
1
1.5
OUTPUT CURRENT [A]
Dropout Voltage (VIN-VOUT) vs. Output Current
T.B.D.
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TJ49150
APPLICATION INFORMATION
The TJ49150 is a high performance, low dropout linear regulator, designed for high current application that
requires fast transient response. The TJ49150 operates from two input supply voltages, significantly reducing
dropout voltage. The TJ49150 is designed so that a minimum of external component are necessary.
Bias Supply Voltage
The TJ49150 control circuitry is supplied by the BIAS pin which requires a very low bias current even at the
maximum output current level. A bypass capacitor on the bias pin is recommended to improve the
performance of the TJ49150 during line and load transient. A small ceramic capacitor from BIAS pin to ground
reduces high frequency noise that could be injected into the control circuitry from the bias rail. In practical
applications, a 1μF capacitor and smaller valued capacitors such as 0.01μF or 0.001μF in parallel with that larger
capacitor may be used to decouple the bias supply. The BIAS input voltage must be 2.1V above the output
voltage, with a minimum BIAS input voltage of 3.0V.
Adjustable Regulator Design
The TJ49150 adjustable version allows fixing output voltage anywhere between 0.8V and 2.0V using two external
resistors as presented in the typical application circuit. The resistor values are given by;
V
R1 = R2 × OUT − 1
0.8
It is suggested to use R1 values lower than 10kΩ to obtain better load transient performances. Even, higher
values up to 100kΩ are suitable.
Enable
The SOP-8 and SOP8-PP types of TJ49150 feature an active high Enable input(EN) that allows on/off control of the
regulator. The enable function of TJ49150 has hysteresis characteristics. The enable input allows on control of
the regulator with the enable pin voltage of 2.0V or above. When the enable input voltage lowers under 0.4V,
the enable input allows off control of the regulator. If not in used for logic control, EN pin must be tied to BIAS
voltage for proper operation. When a pull-up resistor is connected between EN pin and VEN signal(or VBIAS line),
the resistance should be kept under 10kΩ. The EN pin must not be left at high impedance.
Supply Power Sequencing
In common applications where the power on transient of IN and BIAS voltages are not particularly fast(Tr>100μs),
no power sequencing is required. Where voltage transient input is very fast(Tr<100μs), it is recommended to
have the IN voltage present before or, at least, at the same time as the BIAS voltage in order to avoid over voltage
spikes during the power on transient.
Output Capacitors
The TJ49150 requires a minimum output capacitance to maintain stability. The TJ49150 is specifically designed to
be stable with a ceramic chip, tantalum, and aluminum electrolytic capacitor. A 10μF of ceramic chip capacitor or
a 33μF tantalum or aluminum electrolytic capacitor would satisfy most applications. Its minimum value of
ceramic chip capacitor is 1μF and of tantalum or aluminum electrolytic capacitor is 22μF. They might be
increased if output current is high.
Input Capacitor
An input capacitor of minimum 1μF of chip ceramic capacitor or 10μF of tantalum or aluminum electrolytic
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TJ49150
capacitor is recommended. Larger values will help to improve ripple rejection by bypassing the input to the
regulator, further improving the integrity of the output voltage.
Feed Forward Capacitor
The TJ49150 requires a feed forward capacitor to stabilize output in case of complicated transient load condition.
It also performs a soft-start(SS) function on the output voltage. A 10nF is recommended to support its stability
support function and its higher value will increase the time of SS function.
Maximum Output Current Capability
The TJ49150 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 TJ49150. 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) + (VBIAS X IBIAS)} – (VOUT X IOUT)
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
TJ49150 is available in SOP-8, SOP-8-PP, and TO-252-5L packages. The thermal resistance depends on amount of
copper area or heat sink, and on air flow.
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.
The 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.
Wider copper plane area leads lower θJA.
The maximum allowable power dissipation is also influenced by the ambient temperature. With the θJA-Copper
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TJ49150
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
The graph below is valid for the thermal impedance specified in the Thermal Information section on page 2.
2
ALLOWABLE POWER DISSIPATION [W]
1.8
1.6
SOP-8-PP
1.4
TO-252-5L
1.2
1
0.8
0.6
0.4
0.2
0
0
20
40
60
80
100
120
140
AMBIENT TEMPERATURE [℃]
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TJ49150
REVISION NOTICE
The information in this datasheet can be revised without any notice to describe proper electrical characteristics.
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