UNISONIC TECHNOLOGIES CO., LTD
LXXLD70
Preliminary
CMOS IC
0.8V REFERENCE ULTRA
LOW DROPOUT LINEAR
REGULATOR
DESCRIPTION
The UTC
LXXLD70
is a typical LDO with the features of very
low dropout voltage as low as 0.15V at output current 7.0A.
For normal operation, two supply voltages are necessary.
One called control voltage from other equipment can shutdown
the output voltage and it should pull and hold the voltage of EN
pin less than 0.3V. Another one is the main supply voltage whose
purpose is for main power conversion, to keep the power
dissipation low, and to make the dropout voltage lower.
Internally, in the UTC
LXXLD70,
there’re many functions
which can be seen in the block figure to prevent the IC from being
damaged. Internal Power-On-Reset (POR) circuit can control the
two supply voltages to prevent fault operations of the circuit; the
thermal shutdown circuit is able to protect the device from over
thermal operation, and a current limit function will keep the device
work safely under current over-loads.
The UTC
LXXLD70
can be used as an ideal to provide well
supply voltage in the applications, such as front-side-bus
termination on motherboard, NB applications, front side bus V
TT
(1.2V/7.0A) and note book PC applications.
HSOP-8
FEATURES
* Low Dropout V
D
= 0.15V (typ.)
@
I
OUT
=7.0A
* Low ESR Output Capacitor
* V
REF
=0.8V
* ±1.5% over Line, Load and Temperature Output Accuracy
* Fast Transient Response
* Output Voltage Adjustable through External Resistors
* POR (Power-On-Reset) controlling V
CNTL
and V
IN
* With internal Soft-Start
* Internal Current Limit Protection
* Internal Under Voltage Protection
* Hysteretic Thermal Shutdown
* With Power-OK Output (with a Delay Time)
* For Standby or Suspend Mode: Shutdown
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LXXLD70L-SH2-R
LXXLD70G-SH2-R
LXXLD70L-SH2-T
LXXLD70G-SH2-T
Note: XX: Output Voltage, refer to Marking Information.
Package
HSOP-8
HSOP-8
Packing
Tape Reel
Tube
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LXXLD70
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
Preliminary
CMOS IC
MARKING
Date Code
HSOP-8
AD : ADJ
UTC
LXXLD70
G: Halogen Free
L: Lead Free
Lot Code
Voltage Code
PIN CONFIGURATION
GND
FB
V
OUT
V
OUT
8
7
6
5
EN
P
OK
V
CNTL
V
IN
1
2
3
4
PIN DESCRIPTION
PIN NO.
1
PIN NAME
GND
DESCRIPTION
Ground pin.
There’s an external resistor divider connected to this pin which is necessary to give the
feedback voltage to the regulator. The external circuit is combined as the follow:
between V
OUT
and FB is R1(connected with a bypass capacitor which can improve the
load transient response),and between FB and ground is R2.The value of R2 and R1 are
recommended between 100Ω~10kΩ.So the output voltage is equals:
R1
V
OUT
=0.8·(1+
)(V)
R2
The output voltage pin of the regulator. There should be set an output capacitor to
compensate for closed-loop and also to improve transient responses. It’s necessary to
connect Pin 3 and Pin 4 together by wide tracks.
This pin is the main supply input.
It’s necessary to connect the Exposed Pad and V
IN
together for lower dropout voltage.
Monitoring this pin’s voltage can reset Power-On.
Power input pin of the control circuitry. Connecting this pin to a +5V (recommended)
supply voltage provides the bias for the control circuitry. The voltage at this pin is
monitored for Power-On Reset purpose.
Output pin for Power-OK signal output.
Being an open drain output, through senescing FB voltage, this pin can show the users
the output voltage’s states. That’s this pin will be low under any of these two situations:
the rising FB voltage is not above the V
POK
threshold; the falling FB voltage is below the
V
PNOK
threshold. That indicates the output voltage is not ready for users.
Input Enable control pin. The output voltage can be shut down when this pin is below
0.3V. This pin’s voltage can be set higher than V
CNTL
voltage by an internal 10μA
current source, and then the regulator will begin working normally.
2
FB
3
4
5
V
OUT
V
OUT
V
IN
6
V
CNTL
7
P
OK
8
EN
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LXXLD70
BLOCK DIAGRAM
EN
Preliminary
CMOS IC
V
CNTL
FB
FB
Power On
Reset
-
UV
+
0.4V
Soft-Start and
Control Logic
V
IN
-
EAMP
+
V
REF
0.8V
+
-
90%
V
REF
POK
Thermal
Limit
V
OUT
Current Limit
Dealy
P
OK
GND
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LXXLD70
ABSOLUTE MAXIMUM RATING
Preliminary
CMOS IC
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage (V
CNTL
to GND)
V
CNTL
-0.3 ~ +7
V
Supply Voltage (V
IN
to GND)
V
IN
-0.3 ~ +3.9
V
EN and FB to GND
V
I/O
-0.3 ~ V
CNTL
+0.3
V
POK to GND Voltage
V
POK
-0.3 ~ +7
V
Power Dissipation
P
D
3
W
Lead Soldering Temperature, 10 Seconds
T
SDR
260
°С
Junction Temperature
T
J
150
°С
Storage Temperature
T
STG
-65 ~ +150
°С
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
UNIT
Junction to Ambient in Free Air (Note 1)
θ
JA
38
°C/W
Junction to Case (Note 2)
θ
JC
14
°C/W
Notes: 1.
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air.
The exposed pad of HSOP-8 is soldered directly on the PCB.
2. The Thermal Pad Temperature is measured on the PCB copper area connected to the thermal pad of
package.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
VCNTL Supply Voltage
VIN Supply Voltage
Output Voltage , V
CNTL
=5.0±5%
Output Current
Junction Temperature
SYMBOL
V
CNTL
V
IN
V
OUT
I
OUT
T
J
RATINGS
4.5 ~ 6
1.0 ~ 3.5
0.8 ~ V
IN
-0.2
0~7
+125
UNIT
V
V
V
A
°С
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LXXLD70
Preliminary
CMOS IC
ELECTRICAL CHARACTERISTICS
(Refer to the typical application circuit. These specifications apply over, V
CNTL
=5V, V
IN
=1.25V, V
OUT
=1.05V and
T
A
=-40 ~ 85°C, unless otherwise specified. Typical values are at T
A
=25°C).
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX
SUPPLY CURRENT
V
CNTL
Supply Current
I
VCNTL
EN=V
CNTL
, V
FB
is well regulated
0.4 1.0 2.0
V
CNTL
Shutdown Current
I
SD
EN=GND
280 380
POWER-ON-RESET (POR)
Rising V
CNTL
POR Threshold
V
CNTL
Rising
2.7 2.9 3.1
V
CNTL
POR Hysteresis
0.4
Rising V
IN
POR Threshold
V
IN
Rising
0.8 0.9 1.0
V
IN
POR Hysteresis
0.5
OUTPUT VOLTAGE
Reference Voltage
V
REF
FB=V
OUT
0.8
Output Voltage Accuracy
I
OUT
=0~7A, T
J
=-40 ~ 125°С
-1.5
+1.5
Line Regulation
V
CNTL
=4.5 ~ 6V
-1.5
+1.5
Load Regulation
I
OUT
=0 ~ 7A
0.06 0.15
DROPOUT VOLTAGES
0.11 0.14
I
OUT
=7A, V
CNTL
=5V, T
J
=25°С
V
IN
-to-V
OUT
Dropout Voltage
V
DROP
I
OUT
=7A, V
CNTL
=5V, T
J
=-40~125°С
0.2
PROTECTIONS
8
10
12
V
CNTL
=5V, T
J
=25°С
Current-Limit Level
I
LIM
V
CNTL
=5V, T
J
=-40~125°С
7.2
Thermal Shutdown Temperature
T
SD
T
J
Rising
150
Thermal Shutdown Hysteresis
50
Under-Voltage Threshold
V
FB
Falling
0.4
ENABLE AND SOFT-START
EN Logic High Threshold Voltage
V
EN
Rising
0.3 0.4 0.5
EN Hysteresis
30
EN Pull-High Current
EN=GND
10
Soft-Start Interval
T
SS
2
POWER-OK AND DELAY
P
OK
Threshold Voltage for Power OK
V
POK
V
FB
Rising
90% 92% 94%
P
OK
Threshold Voltage for Power Not OK
V
PNOK
V
FB
Falling
79% 81% 83%
P
OK
Pull-Low Voltage
P
OK
Sinks 5mA
0.25 0.4
P
OK
Delay Time
T
DELAY
1
3
10
UNIT
mA
µA
V
V
V
V
%
mV/V
%
V
V
A
A
°С
°С
V
V
mV
μA
ms
V
REF
V
REF
V
ms
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