EUTECH EUP7963

EUP7963
3A Ultra Low-Dropout Linear Regulator
DESCRIPTION
FEATURES
The EUP7963 is a 3A low-dropout linear regulator that
provides a low voltage, high current output with a
minimum of external components. It offers high
precision, ultra-low dropout, and low ground current.
The EUP7963 operates from an input of 2.5V to 5.5V.
This regulator uses small, 4.7µF ceramic input
capacitors and 10µF ceramic output capacitors to
deliver 3A output current. High bandwidth provides
excellent transient response. It is designed to drive
digital circuits requiring low voltage at high currents
(i.e., PLDs, DSPs, microcontrollers, etc.).
Other features include thermal and current limit
protection, a logic-control shutdown mode and an error
flag output that goes low when the output voltage
drops 10% below nominal value.
It is available in fixed output voltages of 1.5V, 1.8V,
2.5V, 3.3V and as an adjustable device with a 0.8V
reference voltage. The adjustable output voltage can be
set from 0.8V to 4.5V.
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APPLICATIONS
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Typical Application Circuit
Figure1.
DS7963 Ver 1.4 Oct. 2007
3A Guaranteed Output Current
750mV Dropout Voltage at 3A Output
Stable with Ceramic Capacitors
±1.8% Output Voltage Accuracy
1mA Low-Ground Pin Current
0.1µA Quiescent Current in Shutdown Mode
Excellent Line and Load Regulation
Thermal Shutdown and Current Limit Protection
Error Flag Indication
Available in To-263, and To-220 Packages
RoHS Compliant and 100% Lead (Pb)-Free
1
LDO Linear Regulator for Low-Voltage Digital IC
PC Add-In Cards
High Efficiency Linear Power Supplies
Post Regulator
EUP7963
Block Diagram
Figure2.
Pin Configurations
Package Type
Pin Configurations
TO220-3
TO220-5
TO263-3
TO263-5
Pin Description
TO220-3
TO263-3
VEN
TO220-5
TO263-5
1
VIN
2
1
Input Voltage of the LDO
GND
3
2
Ground: TAB is connected to ground
VOUT
4
3
Output voltage of the LDO
PIN
ERROR
ADJ
5
DS7963 Ver 1.4 Oct. 2007
DESCRIPTION
Enable Input. Logic high=enable, Logic low=shutdown
ERROR
Flag Output. Active-low indicated an output fault condition
Adjustable Regulator Feedback Input. Connect to resistor voltage divider
2
EUP7963
Ordering Information
Order Number
Package Type
EUP7963-15KAIR1
TO220-3
EUP7963-18KAIR1
TO220-3
EUP7963-25KAIR1
TO220-3
EUP7963-33KAIR1
TO220-3
EUP7963-15KBIR1
TO220-5
EUP7963-18KBIR1
TO220-5
EUP7963-25KBIR1
TO220-5
EUP7963-33KBIR1
TO220-5
EUP7963KBIR1
TO220-5
EUP7963-15LAIR1
TO263-3
EUP7963-18LAIR1
TO263-3
EUP7963-25LAIR1
TO263-3
EUP7963-33LAIR1
TO263-3
EUP7963-15LBIR1
TO263-5
EUP7963-18LBIR1
TO263-5
EUP7963-25LBIR1
TO263-5
EUP7963-33LBIR1
TO263-5
EUP7963LBIR1
TO263-5
Marking
xxxxx
P7963C
xxxxx
P7963D
xxxxx
P7963B
xxxxx
P7963H
xxxxx
P7963C
xxxxx
P7963D
xxxxx
P7963B
xxxxx
P7963H
xxxxx
P7963A
xxxxx
EUP7963C
xxxxx
EUP7963D
xxxxx
EUP7963B
xxxxx
EUP7963H
xxxxx
EUP7963C
xxxxx
EUP7963D
xxxxx
EUP7963B
xxxxx
EUP7963H
xxxxx
EUP7963A
EUP7963-□ □ □ □ □ □ □
Lead Free Code
1: Lead Free 0: Lead
Packing
R: Tape & Reel
Operating temperature range
I: Industry Standard
Package Type:
KA: TO220-3 KB: TO220-5
LA: TO263-3 LB: TO263-5
Output Voltage
15: 1.5V
18: 1.8V
25: 2.5V
33: 3.3V
Blank: Adjustable
DS7963 Ver 1.4 Oct. 2007
3
Operating Temperature range
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
EUP7963
Absolute Maximum Ratings
Supply Voltage VIN ---------------------------------------------------------------------- 5.5V
Package Thermal Resistance
TO-263, θJA ------------------------------------------------------------------------- 45%/W
TO-220, θJA ------------------------------------------------------------------------- 55%/W
Power Dissipation, PD@TA=25°C
TO-263 ------------------------------------------------------------------------------ 2.2W
TO-220 ------------------------------------------------------------------------------ 1.8W
Junction Temperature ------------------------------------------------------------------- 150°C
Storage Temperature ------------------------------------------------------ -65°C to +150°C
Lead Temp -----------------------------------------------------------------------------260°C
ESD Rating
Human Body Model ---------------------------------------------------------------------- 2kV
„
„
„
„
„
„
„
Operating Ratings
„
„
„
Supply Voltage VIN ---------------------------------------------------------------- 2.5 to 5.5V
Enable Input Voltage -------------------------------------------------------------- 0V to 5.5V
Junction Temperature ------------------------------------------------------ -40°C to +125°C
Electrical Characteristics
Limits in standard typeface are for TJ =25°C. Unless otherwise specified: VIN= VOUT(nom) +1V, IL=10mA, COUT=10µF
Symbol
ΔVOUT
Parameter
Output Voltage Tolerance
VOUT+1V ≤ VIN ≤ 5.5V
10mA ≤ IL ≤ 3A
Line Regulation
VOUT+1V ≤ VIN ≤ 5.5V
Load Regulation
10mA ≤ IL ≤ 3A
VIN -VOUT Dropout Voltage
IGND
IO(PK)
Conditions
Ground Pin Current in
Normal Operation Mode
EUP7963
Typ
Max.
-1.8
IL = 300mA
%
0.1
0.3
%/ ∆ V
0.15
0.3
%/ ∆ A
mV
IL = 3A
750
IL = 0A
1.0
1.5
IL = 3A
1.4
2.1
VEN ≤0.3V
Peak Output Current
VO ≥ VO(NOM) -4%
0.01
Short Circuit Protection
ISC
Short Circuit Current
4
Unit
1.8
50
Ground Pin Current in
Shutdown Mode
DS7963 Ver 1.4 Oct. 2007
Min
10
mA
µA
4.3
A
4.6
A
EUP7963
Electrical Characteristics
Limits in standard typeface are for TJ =25°C. Unless otherwise specified: VIN= VOUT(nom) +1V, IL=10mA,COUT=10µF
Symbol
VIH
Parameter
Enable Threshold
VIL
Conditions
Output = High
EUP7963
Min
Typ
Max.
1.4
Output = Low
0.3
Unit
V
TdOFF
Turn-off delay
IL = 3A
15
TdON
Turn-on delay
IL = 3A
20
VEN Pin Input Current
VEN=VIN
0.1
1
µA
7
10
14
%
3
5
8
%
0.02
0.2
V
IEN
ERROR
VT
Flag
Threshold
VTH
VEF(Sat)
Td
IIK
Imax
Threshold Hysteresis
Flag Saturation
Flag Reset Delay
ERROR
ERROR
Flag Pin Leakage
Current
ERROR
Flag Pin Sink
Current
AC Parameters
PSRR
en
ISINK=100µA
Ripple Rejection
Output Noise Voltage
VError=0.5V
VIN=VOUT+1V
COUT=10uF
VOUT=3.3V, f=120Hz
BW=10Hz -100kHz
VOUT=2.5V
µs
1
µs
1
nA
3
mA
56
dB
200
µV(rms)
150
°C
15
°C
Over Temperature Protection
TSH(t)
TSH(h)
Shutdown Threshold
Thermal Shutdown
Hysteresis
DS7963 Ver 1.4 Oct. 2007
5
EUP7963
Typical Operating Characteristics
DS7963 Ver 1.4 Oct. 2007
6
EUP7963
DS7963 Ver 1.4 Oct. 2007
7
EUP7963
Application Note
External Capacitors
Like any low-dropout regulator, the EUP7963 requires
external capacitors for regulator stability. These
capacitors must be correctly selected for good
performance.
Input Capacitor
An input capacitance of 4.7µF is required between the
EUP7963 input pin and ground (the amount of the
capacitance may be increased without limit).
This capacitor must be located a distance of not more
than 1cm from the input pin and returned to a clean
analog ground. Any good quality ceramic, tantalum, or
film capacitor may be used at the input.
If a tantalum capacitor is used at the input, it must be
guaranteed by the manufacturer to have a surge current
rating sufficient for the application.
There are no requirements for the ESR on the input
capacitor, but tolerance and temperature coefficient must
be considered when selecting the capacitor to ensure the
capacitance will be 4.7µF over the entire operating
temperature range.
Output Capacitor
The EUP7963 is designed specifically to work with very
small ceramic output capacitors. A ceramic capacitor
(temperature characteristics X7R, X5R, Z5U, or Y5V) in
10 to 22µF range with 5mΩ to 200mΩ ESR range is
suitable in the EUP7963 application circuit.
The output capacitor must meet the requirement for
minimum amount of capacitance and also have an ESR
(Equivalent Series Resistance) value which is within a
stable range (5mΩ to 200mΩ)
No-Load Stability
The EUP7963 will remain stable and in regulation with
no external load. This is specially important in CMOS
RAM keep-alive applications.
On/Off Input Operation
The EUP7963 is turned off by pulling the VEN pin low,
and turned on by pulling it high. If this feature is not used,
the VEN pin should be tied to VIN to keep the regulator
output on at all time. To assure proper operation, the
signal source used to drive the VEN input must be able to
swing above and below the specified turn-on/off voltage
thresholds listed in the Electrical Characteristics section
under VIL and VIH.
DS7963 Ver 1.4 Oct. 2007
8
ERROR Flag Operation
The EUP7963 produces a logic low signal at the
ERROR Flag pin when the output drops out of
regulation due to low input voltage, current limiting, or
thermal limiting. This flag has a built in hysteresis.
The internal ERROR flag comparator has an open drain
output stage. Hence, the ERROR pin should be pulled
high through a pull up resistor. The ERROR pin must be
connected to ground if this function is not used. It should
also be noted that when the shutdown pin is pulled low,
the ERROR pin is forced to be invalid for reasons of
saving power in shutdown mode.
Adjustable Operation
The adjustable version of the EUP7963 has an output
voltage range of 0.8V to 4.5V. The output voltage of the
EUP7963 adjustable regulator is programmed using an
external resistor divider as shown in Figure3. The output
voltage is calculated using:
V =V
O
ref
× (1 +
R1
R
)
2
Where:
Vref= 0.8V typ. (the internal reference voltage)
Utilize the following equation for adjusting the output to
a particular voltage:
 V

PI = R  O − 1
2 0.8V


Choose R2=50k to optimize accuracy, power supply
rejection, noise and power consumption.
EUP7963
Power Dissipation
EUP7963 can deliver a continuous current of 2A over the
full operating temperature range. A heatsink may be
required depending on the maximum power dissipation
and maximum ambient temperature of the application.
Under all possible conditions, the junction temperature
must be within the range specified under operating
conditions. The total power dissipation of the device is
given by:
(
)
( )
P = V −V
I
+ V
I
D
IN
IN GND
OUT OUT
Where IGND is the operating ground current of the device
(specified under 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
DS7963 Ver 1.4 Oct. 2007
9
PCB Layout
Good PC layout practices must be used or instability can
be induced because of ground loops and voltages drops.
The input and output capacitors must be directly
connected to the input, output, and ground pins of the
regulator using traces which do not have other currents
flowing in them.
The best way to do this is to lay out CIN and COUT near
the device with short traces to the VIN, VOUT, and ground
pins. The regulator ground pin should be connected to
the external circuit ground so that the regulator and its
capacitors have a “single point ground”.
It should be noted that stability problems have been seen
in applications where “vias” to an internal ground plane
were used at the ground points of the IC and the input
and output capacitors. This was caused by varying
ground potentials at these nodes resulting from current
flowing through the ground plane. Using a single point
ground technique for the regulator and it’s capacitors
fixed the problem.
Since high current flows through the traces going into
VIN and coming from VOUT, Kelvin connect the capacitor
leads to these pins so there is no voltage drop in series
with the input and output capacitors.
EUP7963
Packaging Information
TO263-3
SYMBOLS
A
C2
b
b1
D
E
e
H
L2
L
L1
D1
E1
DS7963 Ver 1.4 Oct. 2007
MILLIMETERS
MIN.
MAX.
4.06
4.83
1.14
1.65
0.51
1.00
1.14
1.40
8.38
9.65
9.65
10.67
2.54
14.60
15.88
1.78
1.78
2.80
1.68
6.86
6.22
-
10
INCHES
MIN.
0.160
0.045
0.020
0.045
0.330
0.380
MAX.
0.190
0.065
0.039
0.055
0.380
0.420
0.100
0.575
0.070
0.270
0.245
0.625
0.070
0.110
0.066
-
EUP7963
TO263-5
A
C2
b
D
E
e
MILLIMETERS
MIN.
MAX.
4.06
4.83
1.14
1.65
0.51
1.00
8.38
9.65
9.65
10.67
1.70
INCHES
MIN.
0.160
0.045
0.020
0.330
0.380
0.067
MAX.
0.190
0.065
0.039
0.380
0.420
H
L
L1
D1
E1
14.60
1.78
6.86
6.22
0.575
0.070
0.270
0.245
0.625
0.110
0.066
-
SYMBOLS
DS7963 Ver 1.4 Oct. 2007
15.88
2.80
1.68
-
11
EUP7963
TO220-3
SYMBOLS
A
A2
b
b1
C
D
D1
Q
E
E1
P
e
A1
L
L1
DS7963 Ver 1.4 Oct. 2007
MILLIMETERS
MIN.
MAX.
4.06
4.83
2.03
2.92
0.64
1.02
1.14
1.52
0.30
0.56
13.72
15.75
7.62
9.40
2.62
2.87
9.65
10.67
4.88
5.33
3.71
4.00
2.54
1.14
1.40
12.70
14.73
6.35
12
INCHES
MIN.
0.160
0.080
0.025
0.045
0.012
0.540
0.300
0.103
0.380
0.190
0.146
MAX.
0.190
0.115
0.040
0.060
0.022
0.620
0.370
0.113
0.420
0.210
0.156
0.100
0.045
0.500
-
0.055
0.580
0.250
EUP7963
TO220-5
SYMBOLS
A
A2
b
C
D
D1
Q
E
E1
P
e
A1
L
DS7963 Ver 1.4 Oct. 2007
MILLIMETERS
MIN.
MAX.
4.06
4.83
2.03
2.92
0.64
1.02
0.30
0.56
13.72
15.75
7.62
9.40
2.62
2.87
9.65
10.67
4.88
5.33
3.71
4.00
1.70
1.14
1.40
12.70
14.73
13
INCHES
MIN.
0.160
0.080
0.025
0.012
6.540
0.300
0.103
0.380
0.190
0.146
MAX.
0.190
0.115
0.040
0.022
0.620
0.370
0.113
0.420
0.210
0.156
0.067
0.045
0.500
0.055
0.580