TJ49300
HTC Korea
3.0A 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 3.0A
Available in SOP-8-PP, TO-252, and TO-263 Packages
Adjustable Output Voltage Down to 0.8V
Fixed Output Voltages : 0.8V, 1.0V and 1.2V
Logic Controlled Shutdown Option
Over-Temperature/Over-Current Protection
-40°C to 125°C Junction Temperature Range
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
TO-263-5L
DESCRIPSION
The TJ49300 is a series of 3.0A high performance ultra
low dropout linear regulator ideal for powering core
voltages of low-power microprocessors.
The
TJ49300 implements a dual supply configuration
allowing for very low output impedance. The
TJ49300 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
1.4V to 5.5V and the bias supply requires between 3V
and 5.5V for proper operation. The TJ49300 offers
fixed output voltages 1.0V and 1.2V and adjustable
output voltages down to 0.8V. The TJ49300 is
developed on a CMOS technology that allows low
quiescent current operation independent of output
current. This technology also allows the TJ49300 to
operate under extremely low dropout conditions.
February 2011
ORDERING INFORMATION
Device
Package
TJ49300GDP-X.X
SOP-8-PP
TJ49300GRS-X.X
TO-252-5L
TJ49300GR-X.X
TO-263-5L
X.X = Output Voltage = ADJ, 1.0 and 1.2
1
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TJ49300
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTIC
SYMBOL
MIN.
MAX.
UNIT
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
VIN
1.4
5.5
V
Bias Supply Voltage
VBIAS
3
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
15
75
°C/W
Thermal Resistance (TO-252-5L) *
68
°C/W
Thermal Resistance (TO-263-5L) *
45
°C/W
Input Supply Voltage (Survival)
RECOMMENDED OPERATING RATINGS
CHARACTERISTIC
Input Supply Voltage
THERMAL INFORMATION
THERMAL METRIC
Thermal Resistance (SOP-8-PP) *
* Calculated from package in still air, mounted to minimum foot print PCB(1 oz., 2-layer).
ORDERING INFORMATION
VOUT
ADJ
Package
Order No.
Description
Marking
Compliance
Status
SOP-8-PP
TJ49300GDP-ADJ
3.0A, Adjustable
TJ49300G
RoHS, Halogen Free
Active
TO-252 5L
TJ49300GRS-ADJ
3.0A, Adjustable
TJ49300G
RoHS, Halogen Free
Active
TO-263 5L
TJ49300GR-ADJ
3.0A,
TJ49300G
RoHS, Halogen Free
Active
Adjustable
1.0V
Contact Us
1.2V
Contact Us
February 2011
2
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TJ49300
PIN CONFIGURATION
SOP-8-PP
TO-252-5L / TO-263-5L
TAB
GND
ADJ/EN
IN
Thermal
Exposed
PAD
OUT
NC
NC
NC
BIAS
ADJ/EN
BIAS
GND
IN
OUT
PIN DESCRIPTION
Pin No.
Pin Name
Pin Function
SOP-8-PP
TO252-5L / TO263-5L
1
1
ADJ / EN
2
2
IN
8
3
GND
Reference Ground.
3
4
OUT
Power Output.
4
5
BIAS
Input Bias Voltage for powering all circuitry on the
regulator except the output power TR.
5, 6, 7
-
NC
-
-
Thermal Exposed PAD / TAB
February 2011
Output Adjust for Adjustable Output.
Chip Enable for Fixed Output (Fixed Version Only).
Power Input.
No Connection.
3
Connect to ground.
HTC
TJ49300
BLOCK DIAGRAM
IN
BIAS
Current
Limit
ADJ
Enable
Bandgap
Reference
Fixed
Thermal
Protection
ADJ
OUT
Fixed
EN/ADJ
GND
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TJ49300
TYPICAL APPLICATION
VIN
VBIAS
BIAS
CIN
EN
IN
VBIAS
VOUT
ADJ
COUT
GND
CBIAS
VIN
COUT
OUT
BIAS
CIN
VEN
GND
CBIAS
VIN
VOUT
OUT
IN
VOUT
OUT
IN
R1
VBIAS
BIAS
CIN
CBIAS
VIN
ADJ
COUT
GND
R2
VOUT
OUT
IN
CFF
VBIAS
BIAS
CIN
CBIAS
R1
ADJ
GND
COUT
R2
* See application information for the details over external capacitor.
** TJ49300 can deliver a continuous current of 3.0A 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 3.0A may be still undeliverable.
*** For the details, see Application Information.
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TJ49300
ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for TJ=25℃, 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
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
2
3
%
0.8
0.82
0.828
V
Output Voltage Tolerance(Note 1)
VO
10 mA < IL < 3.0 A
VOUT+1 V < VIN < 5.5 V
-2
-3
Adjustable Pin Voltage(Note 2)
VADJ
VOUT+1 V < VIN < 5.5 V
0.78
0.772
Line Regulation(Note 3)
ΔVLINE
VOUT+1 V < VIN < 5.5 V
0.02
0.1
%/V
Load Regulation(Note 3, 4)
ΔVLOAD
10 mA < IL < 3.0 A
0.25
1.0
%
IL = 1.5 A
150
200
300
IL = 3.0 A
300
400
500
VDROP
IL = 3.0 A
1.5
2.1
V
IBIAS
IL = 3.0 A
0.55
1.0
1.5
mA
IL = 10 mA
0.55
1.0
1.5
IL = 3.0 A
0.55
1.0
1.5
VEN < 0.2 V
0.1
0.5
1.0
Dropout Voltage
VDROP
Dropout Voltage(Note 5)
Bias Pin Current
Ground Pin Current(Note 6)
IGND1
mV
mA
Ground Pin Current(Note 6, 1)
IGND2
Thermal Shutdown Temperature
TSD
160
°C
ΔTSD
30
°C
Thermal Shutdown Hysteresis
Logic Low
VIL
Output = Low
Logic High
VIH
Output = High
Enable Pin Input Current(Note 1)
IEN
VEN = VBIAS
0.1
1.0
uA
Adjust Pin Current(Note 2)
IADJ
VADJ = 0.8 V
0.01
0.1
uA
Enable threshold
0.4
uA
V
(Note 1)
0.7 * VBIAS
V
Note 1. Fixed output voltage version only.
Note 2. Adjustable output voltage version only.
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 10ms current pulse. Devices are tested for load regulation in
the load range from 10mA to 3.0A.
Note 5. For VOUT ≤ 1.0V, the VBIAS Dropout specification does not apply due that the minimum VBIAS input is 3.0V.
Note 6. IGND = IBIAS + (IIN – IOUT). The total current drawn from the supply is the sum of the load current plus the ground current.
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TJ49300
TYPICAL CHARACTERISTICS
1.8
700
1.6
500
VBIAS = 2.5V
1.4
VBIAS = 3.1V
1.2
DROPOUT VOLTAGE [V]
DROPOUT VOLTAGE [mV]
600
VBIAS = 3.3V
400
VBIAS = 5.0V
300
200
100
1
0.8
0.6
0.4
0.2
0
0
0
1
2
0
3
1
Dropout Voltage (VIN-VOUT) vs. Output Current
0.9
1.4
0.8
1.2
0.6
OUTPUT VOLTAGE [V]
OUTPUT VOLTAGE [V]
3
Dropout Voltage(VBIAS-VOUT) vs. Output Current
0.7
0.5
0.4
0.3
0.2
1
0.8
IOUT=0.1A
0.6
IOUT=3.0A
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
1
1
0.9
VBIAS = 3.3V
0.9
0.8
VBIAS = 5.0V
0.8
BIAS CURRENT [mA]
0.7
BIAS CURRENT [mA]
2
OUTPUT CURRENT [A]
OUTPUT CURRENT [A]
0.6
0.5
0.4
0.3
0.7
0.6
0.5
0.4
0.3
0.2
0.2
0.1
0.1
0
0
0
1
2
3
4
0
5
2
3
OUTPUT CURRENT [A]
INPUT VOLTAGE [V]
BIAS Current vs. VIN
February 2011
1
BIAS Current vs. Output Current
7
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TJ49300
0.830
0.9
0.8
0.820
OUTPUT VOLTAGE [V]
OUTPUT VOLTAGE [V]
0.7
0.810
0.800
0.790
0.6
0.5
0.4
0.3
0.2
0.780
0.1
0.770
-40
0
40
80
0
120
0
1
2
3
4
5
BIAS VOLTAGE [V]
AMBIENT TEMPERATURE [℃]
Reference Voltage vs. Temperature
Reference Voltage vs. VBIAS
VIN
VIN
VBIAS
VBIAS
VOUT
VOUT
TIME: 200us/div
VIN: 2.0V/div,
VBIAS: 2.0V/div,
VOUT: 0.5V/div,
TIME: 200us/div
VIN: 2.0V/div,
IOUT=1.0A
VBIAS & VIN Start Up Transient Response
VBIAS: 2.0V/div,
VOUT: 0.5V/div,
IOUT=0.5A
VIN Start Up Transient Response
VBIAS
IOUT
VOUT
TIME: 200us/div
VBIAS: 2.0V/div,
IOUT: 2.0A/div,
VOUT: 0.5V/div,
VIN=2.5V
VBIAS Start Up Transient Response
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TJ49300
APPLICATION INFORMATION
The TJ49300 is a high performance, low dropout linear regulator, designed for high current application that
requires fast transient response. The TJ49300 operates from two input supply voltages, significantly reducing
dropout voltage. The TJ49300 is designed so that a minimum of external component are necessary.
Bias Supply Voltage
The TJ49300 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 TJ49300 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 TJ49300 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 100 kΩ are suitable.
Enable
The fixed output voltage version of TJ49300 feature an active high Enable input(EN) that allows on/off control of
the regulator. The enable function of TJ49300 has hysteresis characteristics. The enable input allows on
control of the regulator with the enable pin voltage of VBIAS x 0.7. 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 > 100us),
no power sequencing is required. Where voltage transient input is very fast(Tr<100us), 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 TJ49300 requires a minimum output capacitance to maintain stability. The TJ49300 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 and 10μF of tantalum or aluminum electrolytic
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TJ49300
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 TJ49300 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 TJ49300 can deliver a continuous current of 3.0A 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 3.0A may be still
undeliverable due to the restriction of the power dissipation of TJ49300. 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
TJ49300 is available in SOP8-PP, TO252, and TO263 packages.
copper area or heat sink, and on air flow.
The thermal resistance depends on amount of
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.
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With the θJA-Copper
HTC
TJ49300
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.
θJA = TRmax / PD = (TJmax – TAmax) / PD
All this relationship is based on the aforesaid equation ;
The graph below is valid for the thermal resistance specified in the Thermal Information section on page 2.
ALLOWABLE POWER DISSIPATION [W]
3
2.5
SOP-8-PP
2
TO-252-5L
TO-263-5L
1.5
1
0.5
0
0
20
40
60
80
100
120
140
AMBIENT TEMPERATURE [℃]
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TJ49300
REVISION NOTICE
The information in this datasheet can be revised without any notice to describe proper electrical characteristics.
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