Eutech EUP7962-25LAIR1 2a ultra low-dropout linear regulator Datasheet

EUP7962
2A Ultra Low-Dropout Linear Regulator
DESCRIPTION
FEATURES
The EUP7962 is a 2A 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 EUP7962 operates from an input of 2.5V to 5.5V.
This regulator uses small, 2.2µF ceramic input
capacitors and 10µF ceramic output capacitors to
deliver 2A 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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z
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Typical Application Circuit
Figure1.
DS7962 Ver 1.4 Oct. 2007
2A Guaranteed Output Current
600mV Dropout Voltage at 2A 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,To-220 and SOP-8 (FD) 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
EUP7962
Block Diagram
Figure2.
DS7962 Ver 1.4 Oct. 2007
2
EUP7962
Pin Configurations
Package Type
Pin Configurations
TO220-3
TO220-5
TO263-3
TO263-5
SOP-8 (FD)
*Thermal Pad
Pin Description
VEN
TO220-5
TO263-5
1
TO220-3
TO263-3
-
VIN
2
GND
VOUT
PIN
SOP-8 (FD)
DESCRIPTION
-
Enable Input. Logic high=enable, Logic low=shutdown
1
3
Input Voltage of the LDO
3
2
8
Ground: TAB is connected to ground
4
3
6
Output voltage of the LDO
-
ERROR
5
-
ADJ
7
SD
-
-
2
NC
-
-
1,4,5
DS7962 Ver 1.4 Oct. 2007
ERROR Flag Output. Active-low indicated an output fault
condition
Adjustable Regulator Feedback Input. Connect to resistor
voltage divider
Shutdown terminal
No internal connection
3
EUP7962
Ordering Information
Order Number
Package Type
EUP7962-15KAIR1
TO220-3
EUP7962-18KAIR1
TO220-3
EUP7962-25KAIR1
TO220-3
EUP7962-33KAIR1
TO220-3
EUP7962-15KBIR1
TO220-5
EUP7962-18KBIR1
TO220-5
EUP7962-25KBIR1
TO220-5
EUP7962-33KBIR1
TO220-5
EUP7962KBIR1
TO220-5
EUP7962-15LAIR1
TO263-3
EUP7962-18LAIR1
TO263-3
EUP7962-25LAIR1
TO263-3
EUP7962-33LAIR1
TO263-3
EUP7962-15LBIR1
TO263-5
EUP7962-18LBIR1
TO263-5
EUP7962-25LBIR1
TO263-5
EUP7962-33LBIR1
TO263-5
EUP7962LBIR1
TO263-5
EUP7962DIR1
SOP-8
Marking
xxxxx
P7962C
xxxxx
P7962D
xxxxx
P7962B
xxxxx
P7962H
xxxxx
P7962C
xxxxx
P7962D
xxxxx
P7962B
xxxxx
P7962H
xxxxx
P7962A
xxxxx
EUP7962C
xxxxx
EUP7962D
xxxxx
EUP7962B
xxxxx
EUP7962H
xxxxx
EUP7962C
xxxxx
EUP7962D
xxxxx
EUP7962B
xxxxx
EUP7962H
xxxxx
EUP7962A
xxxxx
EUP7962
A
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
-40 °C to 125°C
EUP7962-□ □ □ □ □ □ □
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
D: SOP
Output Voltage
15: 1.5V, 18: 1.8V,25: 2.5V, 33: 3.3V ,Black: Adjustable
DS7962 Ver 1.4 Oct. 2007
4
EUP7962
Absolute Maximum Ratings
Supply Voltage VIN ---------------------------------------------------------------------- 5.5V
Package Thermal Resistance
TO-263, θJA ------------------------------------------------------------------------- 45°C /W
TO-220, θJA ------------------------------------------------------------------------- 55°C /W
SOP-8 (FD), θJA -------------------------------------------------------------------- 42.3°C/W
Power Dissipation, PD@TA=25°C
TO-263 ------------------------------------------------------------------------------ 2.2W
TO-220 ------------------------------------------------------------------------------ 1.8W
SOP-8 (FD) ------------------------------------------------------------------------- 0.8W
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 ≤ 2A
Line Regulation
VOUT+1V ≤ VIN ≤ 5.5V
Load Regulation
10mA ≤ IL ≤ 2A
VIN -VOUT Dropout Voltage
IGND
IO(PK)
Conditions
Ground Pin Current in
Normal Operation Mode
%
0.09
0.2
%/ ∆ V
0.04
0.2
%/ ∆ A
IL = 150mA
41
50
IL = 2A
600
700
IL = 0A
1
1.5
IL = 2A
1.3
1.9
VEN ≤0.3V
Peak Output Current
VO ≥ VO(NOM) -4%
-1.8
Unit
1.8
Ground Pin Current in
Shutdown Mode
0.01
Short Circuit Protection
ISC
Short Circuit Current
DS7962 Ver 1.4 Oct. 2007
EUP7962
Min
Typ
Max.
5
10
mV
mA
µA
3
A
3.5
A
EUP7962
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
EUP7962
Min
Typ
Max.
1.4
Output = Low
0.3
Unit
V
TdOFF
Turn-off delay
IL = 2A
15
TdON
Turn-on delay
IL = 2A
20
VEN Pin Input Current
VEN=VIN
0.1
1
µA
8
10
12
%
3
5
7
%
0.02
0.1
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
150
µV(rms)
150
°C
15
°C
Over Temperature Protection
TSH(t)
TSH(h)
Shutdown Threshold
Thermal Shutdown
Hysteresis
DS7962 Ver 1.4 Oct. 2007
6
EUP7962
Typical Operating Characteristics
DS7962 Ver 1.4 Oct. 2007
7
EUP7962
DS7962 Ver 1.4 Oct. 2007
8
EUP7962
Application Note
External Capacitors
Like any low-dropout regulator, the EUP7962 requires
external capacitors for regulator stability. These
capacitors must be correctly selected for good
performance.
Input Capacitor
An input capacitance of 2.2µF is required between the
EUP7962 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 2.2µF over the entire operating
temperature range.
Output Capacitor
The EUP7962 is designed specifically to work with very
small ceramic output capacitors. A ceramic capacitor
(temperature characteristics X7R, X5R, Z5U, or Y5V) in
4.7 to 22µF range with 5mΩ to 200mΩ ESR range is
suitable in the EUP7962 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 EUP7962 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 EUP7962 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.
DS7962 Ver 1.4 Oct. 2007
9
ERROR Flag Operation
The EUP7962 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 EUP7962 has an output
voltage range of 0.8V to 4.5V. The output voltage of the
EUP7962 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.
EUP7962
Power Dissipation
EUP7962 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
DS7962 Ver 1.4 Oct. 2007
10
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.
EUP7962
Packaging Information
TO263-3
SYMBOLS
MILLIMETERS
INCHES
MIN.
MAX.
MIN.
MAX.
A
4.06
4.83
0.160
0.190
C2
1.14
1.65
0.045
0.065
b
0.51
1.00
0.020
0.039
b1
1.14
1.40
0.045
0.055
D
8.38
9.65
0.330
0.380
E
9.65
10.67
0.380
0.420
e
2.54
0.100
H
14.60
15.88
0.575
0.625
L2
-
1.78
-
0.070
L
1.78
2.80
0.070
0.110
L1
-
1.68
-
0.066
D1
6.86
-
0.270
-
E1
6.22
-
0.245
-
DS7962 Ver 1.4 Oct. 2007
11
EUP7962
TO263-5
SYMBOLS
MILLIMETERS
INCHES
MIN.
MAX.
MIN.
MAX.
A
4.06
4.83
0.160
0.190
C2
1.14
1.65
0.045
0.065
b
0.51
1.00
0.020
0.039
D
8.38
9.65
0.330
0.380
E
9.65
10.67
0.380
0.420
e
1.70
0.067
H
14.60
15.88
0.575
0.625
L
1.78
2.80
0.070
0.110
L1
-
1.68
-
0.066
D1
6.86
-
0.270
-
E1
6.22
-
0.245
-
DS7962 Ver 1.4 Oct. 2007
12
EUP7962
TO220-3
SYMBOLS
A
A2
b
b1
C
D
D1
Q
E
E1
P
e
A1
L
L1
DS7962 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
13
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
EUP7962
TO220-5
SYMBOLS
MILLIMETERS
INCHES
MIN.
MAX.
MIN.
MAX.
A
4.06
4.83
0.160
0.190
A2
2.03
2.92
0.080
0.115
b
0.64
1.02
0.025
0.040
C
0.30
0.56
0.012
0.022
D
13.72
15.75
6.540
0.620
D1
7.62
9.40
0.300
0.370
Q
2.62
2.87
0.103
0.113
E
9.65
10.67
0.380
0.420
E1
4.88
5.33
0.190
0.210
P
3.71
4.00
0.146
0.156
e
1.70
0.067
A1
1.14
1.40
0.045
0.055
L
12.70
14.73
0.500
0.580
DS7962 Ver 1.4 Oct. 2007
14
EUP7962
SOP-8
SYMBOLS
MILLIMETERS
INCHES
MIN.
MAX.
MIN.
MAX.
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.004
0.010
D
4.90
0.193
E1
3.90
0.153
D1
2.00
0.081
E2
2.00
0.081
E
5.80
6.20
0.228
0.244
L
0.40
1.27
0.016
0.050
b
0.31
0.51
0.012
0.020
e
DS7962 Ver 1.4 Oct. 2007
1.27
0.050
15
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