2A Ultra Low Dropout Linear Regulator TJ4220

2A Ultra Low Dropout Linear Regulator
TJ4220
FEATURES
•
•
•
•
•
•
•
•
•
SOP8 / SOP8-PP
Ultra Low Dropout Voltage
Compatible with low ESR MLCC as Input/Output Capacitor
Good Line and Load Regulation
Guaranteed Output Current of 2A
Available in SOP8, SOP8-PP, SOT-223 and TO-252
and TO-263 Packages
Fixed Output Voltages : 1.0V, 1.2V, 1.8V, 2.5V, and 3.3V
SENSE Option Improves Load Regulation
Over-Temperature/Over-Current Protection
-40 ºC to 125 ºC Junction Temperature Range
SOT-223 3L
TO252 3L / 5L PKG
APPLICATION
•
•
•
•
•
•
•
LCD TVs and SETTOP Boxes
Battery Powered Equipments
Motherboards and Graphic Cards
Microprocessor Power Supplies
Peripheral Cards
High Efficiency Linear Regulators
Battery Chargers
TO-263 3L / 5L PKG
ORDERING INFORMATION
Device
DESCRIPTION
Package
TJ4220GD-ADJ
The TJ4220 series of high performance ultra-low dropout
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 changes in load which
makes them suitable for low voltage micro-processor
applications. The TJ4220 is developed on a CMOS process
technology which allows low quiescent current operation
independent of output load current. This CMOS process
also allows the TJ4220 to operate under extremely low
dropout conditions.
SOP8
TJ4220GD-X.X
TJ4220GDP-ADJ
SOP8-PP
TJ4220GDP-X.X
TJ4220xS-ADJ
SOT-223 3L/5L
TJ4220xS-X.X
TJ4220GRS-ADJ
TO-252 3L/5L
TJ4220GRS-X.X
TJ4220GR-ADJ
TO-263 3L/5L
TJ4220GR-X.X
X.X = Output Voltage = 1.0, 1.2, 1.8, 2.5, and 3.3
Absolute Maximum Ratings
CHARACTERISTIC
SYMBOL
MIN.
MAX.
UNIT
Input Supply Voltage (Survival)
VIN
-
6.5
V
Enable Input Voltage (Survival)
VEN
-
6.5
V
Maximum Output Current
IMAX
-
Lead Temperature (Soldering, 5 sec)
TSOL
Storage Temperature Range
TSTG
-65
TJOPR
-40
Operating Junction Temperature Range
ΘJA-SOP8-PP
Package Thermal Resistance *
2
A
260
ºC
150
ºC
125
68
ºC
ºC/W
* Calculated from package in still air, mounted to 2.6mm X 3.5mm(minimum foot print) 2 layer PCB without thermal vias per JESD51 standards.
Jun. 2011 – R1.0.6
1/14
HTC
2A Ultra Low Dropout Linear Regulator
TJ4220
Ordering Information
VOUT
ADJ
1.0V
1.2V
1.8V
2.5V
3.3V
Package
Order No.
Description
Package Marking
Status
SOP8
TJ4220GD-ADJ
2A, Adjustable, Enable
TJ4220G-ADJ
Contact Us
SOP8-PP
TJ4220GDP-ADJ
2A, Adjustable, Enable
TJ4220G-ADJ
Active
TO-252 5L
TJ4220GRS-ADJ-5L
2A, Adjustable, Enable
TJ4220G-ADJ
Contact Us
TO-263 5L
TJ4220GR-ADJ-5L
2A, Adjustable, Enable
TJ4220G-ADJ
Contact Us
SOP8
TJ4220GD-1.0
2A, Enable, SENSE
TJ4220G-1.0
Contact Us
SOP8-PP
TJ4220GDP-1.0
2A, Enable, SENSE
TJ4220G-1.0
Contact Us
SOT-223 3L
TJ4220S-1.0
2A
4220-1.0
Contact Us
TO-252 3L
TJ4220GRS-1.0-3L
2A
TJ4220G-1.0
Contact Us
TO-252 5L
TJ4220GRS-1.0-5L
2A, Enable, SENSE
TJ4220G-1.0
Contact Us
TO-263 3L
TJ4220GR-1.0-3L
2A
TJ4220G-1.0
Contact Us
TO-263 5L
TJ4220GR-1.0-5L
2A ,Enable, SENSE
TJ4220G-1.0
Contact Us
SOP8
TJ4220GD-1.2
2A, Enable, SENSE
TJ4220G-1.2
Contact Us
SOP8-PP
TJ4220GDP-1.2
2A, Enable, SENSE
TJ4220G-1.2
Contact Us
SOT-223 3L
TJ4220S-1.2
2A
4220-1.2
Contact Us
TO-252 3L
TJ4220GRS-1.2-3L
2A
TJ4220G-1.2
Contact Us
TO-252 5L
TJ4220GRS-1.2-5L
2A, Enable, SENSE
TJ4220G-1.2
Contact Us
TO-263 3L
TJ4220GR-1.2-3L
2A
TJ4220G-1.2
Contact Us
TO-263 5L
TJ4220GR-1.2-5L
2A ,Enable, SENSE
TJ4220G-1.2
Contact Us
SOP8
TJ4220GD-1.8
2A, Enable, SENSE
TJ4220G-1.8
Contact Us
SOP8-PP
TJ4220GDP-1.8
2A, Enable, SENSE
TJ4220G-1.8
Contact Us
SOT-223 3L
TJ4220S-1.8
2A
4220-1.8
Contact Us
TO-252 3L
TJ4220GRS-1.8-3L
2A
TJ4220G-1.8
Contact Us
TO-252 5L
TJ4220GRS-1.8-5L
2A, Enable, SENSE
TJ4220G-1.8
Contact Us
TO-263 3L
TJ4220GR-1.8-3L
2A
TJ4220G-1.8
Contact Us
TO-263 5L
TJ4220GR-1.8-5L
2A ,Enable, SENSE
TJ4220G-1.8
Contact Us
SOP8
TJ4220GD-2.5
2A, Enable, SENSE
TJ4220G-2.5
Contact Us
SOP8-PP
TJ4220GDP-2.5
2A, Enable, SENSE
TJ4220G-2.5
Contact Us
SOT-223 3L
TJ4220S-2.5
2A
4220-2.5
Contact Us
TO-252 3L
TJ4220GRS-2.5-3L
2A
TJ4220G-2.5
Contact Us
TO-252 5L
TJ4220GRS-2.5-5L
2A, Enable, SENSE
TJ4220G-2.5
Contact Us
TO-263 3L
TJ4220GR-2.5-3L
2A
TJ4220G-2.5
Contact Us
TO-263 5L
TJ4220GR-2.5-5L
2A ,Enable, SENSE
TJ4220G-2.5
Contact Us
SOP8
TJ4220GD-3.3
2A, Enable, SENSE
TJ4220G-3.3
Contact Us
SOP8-PP
TJ4220GDP-3.3
2A, Enable, SENSE
TJ4220G-3.3
Contact Us
SOT-223 3L
TJ4220S-3.3
2A
4220-3.3
Contact Us
TO-252 3L
TJ4220GRS-3.3-3L
2A
TJ4220G-3.3
Contact Us
TO-252 5L
TJ4220GRS-3.3-5L
2A, Enable, SENSE
TJ4220G-3.3
Contact Us
TO-263 3L
TJ4220GR-3.3-3L
2A
TJ4220G-3.3
Contact Us
TO-263 5L
TJ4220GR-3.3-5L
2A ,Enable, SENSE
TJ4220G-3.3
Contact Us
Jun. 2011 – R1.0.6
2/14
HTC
2A Ultra Low Dropout Linear Regulator
TJ4220
T J 4 2 2 0 G RS – A D J – 5 L
Lead Count : 3L / 5L (Applied for TO252 & TO263 only)
Output Voltage : ADJ / 1.0 / 1.2 / 1.8 / 2.5 / 3.3
Package Type
D
DP
S
RS
R
: SOP8
: SOP8-PP
: SOT223
: TO252
: TO263
Material Class
: Halogen Free
G
Blank : Pb Free
Root Name
Product Code
PIN CONFIGURATION
N.C 1
N.C 1
8 GND
EN 2
7 ADJ / SENSE
EN 2
VIN 3
6 VOUT
VIN 3
N.C 4
5 N.C
N.C 4
SOP8
TO252-3L
8 GND
7 ADJ / SENSE
Exposed
PAD
6 VOUT
5 N.C
SOP8-PP
TO252-5L
SOT223-3L
TO263-3L
TO263-5L
PIN DESCRIPTION
Pin No.
SOT223/TO252/TO263 3 LEAD
TO252 / TO263 5 LEAD
SOP8/SOP8-PP
Name
Function
Name
Function
Name
Function
1
VIN
Input Supply
EN
Chip Enable
-
N.C.
2
GND
Ground
VIN
Input Supply
EN
Chip Enable
3
VOUT
Output Voltage
GND
Ground
VIN
Input Supply
4
-
-
VOUT
Output Voltage
-
N.C.
5
-
-
SENSE/ADJ
Remote Sense
or Output Adjust
-
N.C.
6
-
-
-
-
VOUT
Output Voltage
7
-
-
-
-
SENSE/ADJ
Remote Sense
or Output Adjust
8
-
-
-
-
GND
Ground
* Exposed Pad of SOP8-PP package should be externally connected to GND.
Jun. 2011 – R1.0.6
3/14
HTC
2A Ultra Low Dropout Linear Regulator
TJ4220
BASIC APPLICATION
Typical 3 Pin Application
VIN
VIN
VOUT
VOUT
TJ4220
CIN
10uF
COUT
10uF
GND
Typical 5 / 8 Pin Application
VIN
VOUT
VIN
CIN
10uF
VOUT
TJ4220
EN
EN
GND
COUT
10uF
SENSE
5 / 8 Pin Remote Load Sense Application
VIN
VIN
CIN
10uF
VOUT
VOUT
TJ4220
EN
EN
GND
L
O
A
D
COUT
10uF
SENSE
Typical Adjustable Version Application
VOUT
VIN
VIN
CIN
10uF
TJ4220
EN
EN
GND
VOUT
Cff
R2
ADJ
COUT
10uF
R1
* TJ4220 can deliver a continuous current of 2A 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 2A may be still undeliverable.
* See Application Information.
Jun. 2011 – R1.0.6
4/14
HTC
2A Ultra Low Dropout Linear Regulator
TJ4220
ELECTRICAL CHARACTERISTICS(Note 1)
Limits in standard typeface are for TJ=25ºC, 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 = 10 uF, COUT = 10 uF, VEN = VIN - 0.3 V
PARAMETER
Output Voltage Tolerance
Adjustable Pin Voltage
(ADJ version)
SYMBOL
VO
VADJ
TEST CONDITION
VOUT+1 V < VIN < 5.5 V
2.5 V < VIN < 5.5 V
MIN.
TYP.
MAX.
UNIT
-2
-3
0
2
3
%
0.784
0.776
0.8
0.816
0.824
V
Line Regulation(Note 3)
ΔVLINE
VOUT+1 V < VIN < 5.5 V
-
0.15
0.40
%/V
Load Regulation(Note 3, 4)
ΔVLOAD
10 mA < IL < 2 A
-
0.20
0.50
0.60
%
IL = 200 mA
-
45
55
65
Dropout Voltage(Note 5)
VDROP
Ground Pin Current(Note 6)
Ground Pin Current(Note 7)
Power Supply Rejection Ratio
IL = 2 A
-
400
500
600
IL = 200 mA
-
0.40
0.6
1.0
IL = 2 A
-
0.40
0.6
1.0
VEN < 0.2 V
-
0.5
1
2
f = 1kHz
-
55
-
f = 1kHz, CFF = 1uF
-
65
-
IGND
IGND_OFF
PSRR
mV
mA
uA
dB
Current Limit
ILIMIT
-
-
5
-
A
Thermal Shutdown Temperature
TSD
-
-
165
-
ºC
Logic Low
VIL
Output = Low
-
-
0.4
V
Logic High
VIH
Output = High
2.0
-
-
V
IEN
VEN = VIN
-
0.1
1
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 10ms current pulse. Devices are tested for load regulation in the
load range from 10mA to 2A.
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.
Jun. 2011 – R1.0.6
5/14
HTC
2A Ultra Low Dropout Linear Regulator
TJ4220
APPLICATION INFORMATION
Introduction
TJ4220 is intended for applications where high current capability and very low dropout voltage are required. It
provides a simple, low cost solution that occupies very little PCB estate. Additional features include an enable
pin to allow for a very low power consumption standby mode, an adjustable pin to provide a fully adjustable
output voltage, and SENSE pin to provide better remote load regulation characteristics.
Component Selection
Input Capacitor :
A large bulk capacitance over than 10uF/A(Output Load) should be closely placed to the input supply pin of
the TJ4220 to ensure that the input supply voltage does not sag. Also a minimum of 10uF ceramic capacitor is
recommended to be placed directly next to the VIN Pin. It allows for the device being some distance from any
bulk capacitor on the rail. Additionally, input droop due to load transients is reduced, improving load transient
response. Additional capacitance may be added if required by the application.(See Fig.1)
Output Capacitor :
A minimum ceramic capacitor over than 10uF/A(Output Load) should be very closely placed to the output
voltage pin of the TJ4220. Increasing capacitance will improve the overall transient response and stability.
Decoupling (Bypass) Capacitor :
In very electrically noisy environments, it is recommended that additional ceramic capacitors be placed from
VIN to GND. The use of multiple lower value ceramic capacitors in parallel with output capacitor also allows to
achieve better transient performance and stability if required by the application.(See Fig.1)
Feed-Forward Capacitor
To get the higher PSRR than the inherent performance of TJ4220, it is recommended that additional ceramic
feed-forward capacitor be placed from VOUT pin to ADJ pin. The capacitance of feed-forward capacitor with
range of 10pF to 1uF allows to achieve better PSRR performance when required by the application.(See
Fig.2)
Fig. 1. Application with Decoupling Capacitor,
CC1 & CC2
Fig. 2. Application with Feed-Forward Capacitor,
CFF
Delayed Start-Up
When power sequence control is required or rising time of input supply voltage is over than 100usec, it is
recommended to apply delayed start-up by using Cdelay as shown in Fig. 3. It can adjust proper delay by
Rp-Cdelay time constant. And also it can prevent any unexpected transient characteristics at output voltage
when the rising time of input supply voltage is as long as 100usec or longer.
Fig. 3. Application with Delayed Start-Up
Jun. 2011 – R1.0.6
6/14
HTC
2A Ultra Low Dropout Linear Regulator
TJ4220
Output Adjustment (Adjustable Version)
An adjustable output device has output voltage range of 0.8V to 5.0V. The operating condition of VIN and
the operating characteristics of VOUT depend on the dropout voltage performance in accordance with
output load current presented at Fig. 7. To obtain a desired output voltage, the following equation can be
used with R1 resistor range of 100Ω to 50kΩ.
VIN
VIN
CIN
10uF
TJ4220
EN
EN
VOUT
VOUT
GND
Cff
R2
ADJ
COUT
10uF
R1
V

R 2  R1  OUT  1
0
.
8


Fig. 4. Application for Adjustable Output Voltage
To enhance output stability, a feed-forward capacitor of 10nF to 1uF can be placed in series with VOUT and
ADJ.(Refer to "Component Selection" Section)
SENSE Pin
In applications where the regulator output is not very close to the load, the TJ4220 can provide better
remote load regulation characteristics using the SENSE pin. TJ4220 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 TJ4220 regulates the voltage at the sense pin when the sense option pin
is used.
Fig. 5. Conventional Linear Regulator Application
Fig.6. Remote Load Sense Application
Maximum Output Current Capability
The TJ4220 can deliver a continuous current of 2A 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 2A may
be still undeliverable due to the restriction of the power dissipation of TJ4220. 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
Jun. 2011 – R1.0.6
7/14
HTC
2A Ultra Low Dropout Linear Regulator
TJ4220
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
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
TJ4220 is available in SOT223, SOP8-PP, TO252 and TO263 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, or 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 graph above is valid for the thermal impedance specified in the Absolute Maximum Ratings section
on page 1.
Jun. 2011 – R1.0.6
8/14
HTC
2A Ultra Low Dropout Linear Regulator
TJ4220
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 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 θJACopper 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.
Jun. 2011 – R1.0.6
9/14
HTC
2A Ultra Low Dropout Linear Regulator
TJ4220
TYPICAL OPERATING CHARACTERISTICS
Test Circuit
Vin
VOUT
VIN
Cff
10K
10uF
Vout
EN
R2
ADJ
GND
10uF
R1
Case 1 ( VIN = 3.3V, VOUT = 2.5V )
VIN : 1.0V/div,
VIN : 1.0V/div,
VOUT : 1.0V/div,
Time : 50ms/div
VIN : 1.0V/div,
VOUT : 1.0V/div,
Time : 50ms/div
Start Up @ Iout=0A
Start Up @ Iout=2A
(Cff=10nF, R2=51KΩ, R1=24KΩ)
(Cff=10nF, R2=51KΩ, R1=24KΩ)
VOUT : 1.0V/div,
Time : 50ms/div
VIN : 1.0V/div,
VOUT : 1.0V/div,
Time : 50ms/div
Start Up @ Iout=0A
Start Up @ Iout=2A
(Cff=10nF, R2=120KΩ, R1=56KΩ)
(Cff=10nF, R2=120KΩ, R1=56KΩ)
Jun. 2011 – R1.0.6
10/14
HTC
2A Ultra Low Dropout Linear Regulator
VIN : 1.0V/div,
VIN : 1.0V/div,
IOUT : 1.0A/div,
VOUT : 1.0V/div,
Time : 50ms/div
TJ4220
VIN : 1.0V/div,
VOUT : 1.0V/div,
Time : 50ms/div
Start Up @ Iout=0A
Start Up @ Iout=2A
(Cff=1uF, R2=51KΩ, R1=24KΩ)
(Cff=1uF, R2=51KΩ, R1=24KΩ)
VOUT : 1.0V/div,
Time : 50ms/div
VIN : 2.0V/div,
VEN : 2.0V/div,
VOUT : 2.0V/div,
Time : 5ms/div
Start Up @ Iout=1A
Start Up with Cdelay @ Iout=10mA
(Cff is varied, R2=51KΩ, R1=24KΩ)
(Cdelay is varied, Cff=10nF, R2=51KΩ, R1=24KΩ)
VOUT : 20mV/div,
Time : 500ms/div
IOUT : 1.0A/div,
VOUT : 20mV/div,
Time : 500ms/div
Load Transient Response
Load Transient Response
(Cff=10nF, R2=51KΩ, R1=24KΩ)
(Cff=10nF, R2=51KΩ, R1=24KΩ)
Jun. 2011 – R1.0.6
11/14
HTC
2A Ultra Low Dropout Linear Regulator
VIN : 1.0V/div,
VEN : 2.0V,
VOUT : 2.0V/div,
Time : 500us/div
TJ4220
VIN : 1.0V/div,
VEN : 2.0V,
VOUT : 2.0V/div,
Time : 500us/div
Start Up by external VEN @ Iout=0A
Start Up by external VEN @ Iout=2A
(Cff=10nF, R2=51KΩ, R1=24KΩ)
(Cff=10nF, R2=51KΩ, R1=24KΩ)
Case 2 ( VIN = 2.5V, VOUT = 1.8V )
VIN : 1.0V/div,
VIN : 1.0V/div,
VOUT : 1.0V/div,
Time : 20ms/div
VIN : 1.0V/div,
VOUT : 1.0V/div,
Time : 20ms/div
Start Up @ Iout=0A
Start Up @ Iout=2A
(Cff=10nF, R2=30KΩ, R1=24KΩ)
(Cff=10nF, R2=30KΩ, R1=24KΩ)
VOUT : 1.0V/div,
Time : 20ms/div
VIN : 1.0V/div,
VOUT : 1.0V/div,
Time : 20ms/div
Start Up @ Iout=0A
Start Up @ Iout=2A
(Cff=10nF, R2=70KΩ, R1=56KΩ)
(Cff=10nF, R2=70KΩ, R1=56KΩ)
Jun. 2011 – R1.0.6
12/14
HTC
2A Ultra Low Dropout Linear Regulator
VIN : 1.0V/div,
VIN : 1.0V/div,
IOUT : 1.0A/div,
VOUT : 1.0V/div,
Time : 20ms/div
TJ4220
VIN : 1.0V/div,
VOUT : 1.0V/div,
Time : 20ms/div
Start Up @ Iout=0A
Start Up @ Iout=2A
(Cff=1uF, R2=30KΩ, R1=24KΩ)
(Cff=1uF, R2=30KΩ, R1=24KΩ)
VOUT : 1.0V/div,
Time : 20ms/div
VIN : 1.0V/div,
VEN : 1.0V/div,
VOUT : 1.0V/div,
Time : 5ms/div
Start Up @ Iout=1A
Start Up with Cdelay @ Iout=10mA
(Cff is varied, R2=30KΩ, R1=24KΩ)
(Cdelay is varied, Cff=10nF, R2=30KΩ, R1=24KΩ)
VOUT : 20mV/div,
Time : 500ms/div
IOUT : 1.0A/div,
VOUT : 20mV/div,
Time : 500ms/div
Load Transient Response
Load Transient Response
(Cff=10nF, R2=30KΩ, R1=24KΩ)
(Cff=10nF, R2=30KΩ, R1=24KΩ)
Jun. 2011 – R1.0.6
13/14
HTC
2A Ultra Low Dropout Linear Regulator
VIN : 1.0V/div,
VEN : 1.0V,
VOUT : 1.0V/div,
Time : 500us/div
TJ4220
VIN : 1.0V/div,
VEN : 1.0V,
VOUT : 1.0V/div,
Time : 500us/div
Start Up by external VEN @ Iout=0A
Start Up by external VEN @ Iout=2A
(Cff=10nF, R2=30KΩ, R1=24KΩ)
(Cff=10nF, R2=30KΩ, R1=24KΩ)
Dropout Voltage @ Vout=2.5V
Jun. 2011 – R1.0.6
14/14
HTC