STMicroelectronics LHC4913 3a positive low drop voltage regulator with inhibit function Datasheet

LHC4913
SERIES
3A POSITIVE LOW DROP VOLTAGE REGULATOR
WITH INHIBIT FUNCTION
ADVANCE DATA
■
■
■
■
■
■
■
■
LOW OUTPUT CAPACITANCE: 1µF
LOW DROP VOLTAGE:
0.5V @ IO=1A
1.5V @ IO=3A
OVERTEMPERATURE PROTECTION
OVERCURRENT PROTECTION
OUTPUT SHORT CIRCUIT MONITORING,
SIGNALLED BY TTL OUTPUT
ON/OFF EXTERNAL CONTROL BY MEANS
OF TTL COMPATIBLE INPUT
ADJUSTABLE CURRENT LIMITATION
PROTECTS OUTPUTS FROM DAMAGING
SHORTCIRCUITS
REMOTE SENSING OPERATION
DESCRIPTION
The LHC4913 is a positive Voltage Regulator
family including both fixed and adjustable
versions. Housed into SO-20 slug-up package
with stand off zero, it is specifically intended for
PowerSO-20 slug-up
applications in rugged environments, such as
Nuclear Physics, in which it has to withstand large
amounts of radiation doses during operating life.
The fixed output voltages available are 2.5, 3.0,
3.3, 5.0 and 8.0V. Input voltage ranges from 3 to
12V.
SCHEMATIC DIAGRAM
August 2002
This is preliminary information on a new product now in development. Details are subject to change without notice.
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LHC4913 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol
VI
VINH
Parameter
DC Input Voltage
INHIBIT Input Voltage
Value
Unit
14
V
VI + 0.5
V
Output Current
Internally limited
Ptot
Power Dissipation
Internally limited
Tstg
Storage Temperature Range
-40 to +150
°C
Top
Operating Junction Temperature Range
-40 to +125
°C
IO
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol
Rthj-case
Parameter
Thermal Resistance Junction-case
CONNECTION DIAGRAM (top view)
PowerSO-20 slug-up
Unit
2
°C/W
PIN DESCRIPTION FOR ADJUSTABLE
VERSION
Pin N°
Symbol
1
2
3
4
GND
NC
NC
VI
Ground Pin
Not Connected
Not Connected
Positive Supply Voltage
5
VO1
Output Pin
6
VO1
Output Pin
7
8
9
10
11
12
13
14
15
SH-CNTRL
OCM
NC
GND
GND
INH
ADJ
NC
VO2
16
VO2
17
VI
18
19
20
NC
NC
GND
Name and Function
Short Circuit Valve Controlling
Over Current Monitoring
Not Connected
Ground Pin
Ground Pin
Inhibit
Adjustable pin
Not Connected
Output Pin
Output Pin
Positive Supply Voltage
Not Connected
Not Connected
Ground Pin
ORDERING CODES
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TYPE
Power-SO20 slug-up
OUTPUT VOLTAGES
LHC4913
LHC4913PDU
Adjustable
LHC4913 SERIES
APPLICATION DIAGRAM FOR REMOTE SENSINS OPERATION FOR ADJUSTABLE VERSION
FUNCTIONAL DESCRIPTION
ADJUSTABLE VERSION
The ADJUST pin shall be set at 1.225V with the
adequated fraction of VO generated by a resistive
divider inserted between VO and GND. The
ADJ-GROUND resistor value must not be greater
than 2.5 KΩ. For a given VO the following holds:
VO=VADJ(1+R 2/R1).
OVERTEMPERATURE PROTECTION OPTION
The LHC4913 is protected by a junctiontemperature detection circuit, turning the device
“OFF” when the temperature attains 175°C. The
recovery of the ON mode occurs with a hysteresys
of 40 °C.
OVERCURRENT PROTECTION
The device is equipped with a circuit having the
purpose of limiting the maximum load current, in
order to protect the output stage against possible
overcurrent-related damages. Its threshold can be
modified externally by means of a resistor put
between the pins SH-CNTRL and VI.
For this characteristic, when the load current gets
close to the above threshold, the regulation is
inhibited. Thus, an excellent operation is granted
only up to 66% of preset maximum current.
SHORT CIRCUIT MONITORING / SIGNALLING
In the event of an overcurrent at the output, a
voltage level of 0.4V is present at the OCM pin. In
others conditions, this voltage equals VI.
REMOTE SENSING FOR ADJ VERSION
As pointed out in the pin configuration plot, VO and
SENSE are not linked to each other in order to get
a regulation with a load located far away from the
chip. Under ordinary applications, the SENSE
shall be connected to both VO1 & VO2. To obtain
the best performances it is recommended to be
compliant with the configuration shown in the
figure at top page.
What can degrade the regulation performances of
this configuration is the variable voltage drop
between the chip ground and the load termination
Lv.
This is brought mostly by the current Ib coming
from the output power base and going to ground
through the driver stage. The degradation amount
to (1+R2/R1) x RW1 x IBmax + RW2 x IBmax
APPLICATION INFORMATION
Recommended VI=12V Max, VO= 1.225V Min.
The device is designed to operate with any VI-VO
value according to above mentioned and thermal
dissipation limits.
An input filtering capacitor of 100nF is always
mandatory.
The two VI pins shall always be connected in
parallel, this applies also for the four VO pins.
Device stability is granted in any circumstance
with a 1µF output capacitor.
The device operation is guaranteed with any
Vin-Vout dropout under the above thermal
constraints.
Although two embedded protections first
mentioned (the overtemperature and the
overcurrent) ensure the L4913 integrity against
any fault load condition, it is recommended to
comply with the specified absolute maximum
ratings also in applications involving fast switching
of output currents.
To achieve this, a polyester capacitor of at least
470nF, put close to the regulator between input
and ground, improves the L4913 reliability by
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LHC4913 SERIES
recommended to put one reverse-biased Schottky
diodes between output and ground.
filtering the overvoltages spikes coming out during
this particular operation.
To avoid undervoltages spikes leading both input
and output well below ground, it is in addition
ELECTRICAL CHARACTERISTICS (TJ = 25°C, VI=VO+2.5V, VO=3V, CI = 0.1µF, CO = 1µF (tantalium),
unless otherwise specified)
Symbol
Parameter
Test Conditions
Max.
Unit
TJ= -55 to 125°C
3
12
V
IO = 5mA
TJ= -55 to 125°C
2
2
%
IO = 3A
TJ= -55 to 125°C
1.23
VI
Input Voltage
IO = 3A
VO
Output Voltage
Output Current Limit
Adjustable
ISHORT
∆VO/∆VI Line Regulation
VI = VO+2.5V to 12V,
∆VO/∆VI Load Regulation
IO = 5mA to 3A
Vd
Dropout Voltage
SVR
Quiescent Current
Supply Voltage Rejection
VINH(OFF) Turn Off Voltage
VINH(ON) Turn On Voltage
%
0.4
%
V
IO = 1A
TJ= -55 to 125°C
0.5
1
V
IO = 2A
TJ= -55 to 125°C
0.75
1.5
V
TJ= -55 to 125°C
1
2
V
VI = VO+2.5V to 12V,
VO = 1.23V IO = 5mA
On Mode
1.6
4
mA
VI = VO+2.5V to 12V,
VO = 1.23V IO = 30mA
On Mode
2.7
8
mA
On Mode
VI = VO+2.5V to 12V,
VO = 1.23V IO = 300mA
11
24
mA
VI = VO+2.5V to 12V,
VO = 1.23V IO = 1A
On Mode
32
64
mA
VI = VO+2.5V to 12V,
VO = 1.23V IO = 2A
On Mode
64
130
mA
VI = VO+2.5V to 12V,
VO = 1.23V IO = 3A
On Mode
94
200
mA
VI = 12V
Off Mode
0.3
mA
70
50
dB
VINH = 3V
VI = VO+2.5V ± 0.5V,
IO = 5mA
f = 120Hz
f = 33KHz
TJ= 0 to 125°C
2
V
TJ= -55 to 0°C
2.4
V
0.8
TJ= -55 to 125°C
VI = 12V
Output Capacitance
IO = 5mA to 3A
ESR
Electrical Series
Resistance
Overcurrent Monitor
Voltage Low
Overcurrent Monitor
Voltage High
IO = 5mA to 3A
IOCM = -10µA
(sourced current)
Output Noise Voltage
B= 10Hz to 100KHz
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0.1
0.7
Shutdown Input Current
eN
V
A
0.35
CO
VOCMH
9
3.8
TJ= -55 to 125°C
IINH
VOCML
IO = 5mA
Typ.
IO = 400mA
IO = 3A
Id
Min.
VINH = 5V
120
µA
1
µF
2
IOCM = 10mA (sinked current)VI = 12V
VI = VO+2.5V
VI = 12V
IO = 1A
V
6
Ω
0.4
V
VO+2.5
V
12
66
µVrms/V
LHC4913 SERIES
PowerSO-20 Slug-up MECHANICAL DATA
DIM.
mm.
TYP
MIN.
3.25
3
A
a1
A2
A4
A5
b
c
D
D1
D2
E
e
e3
E1
E2
E3
G
h
H
L
N
R
S
V
3.15
0.8
0.15
0.4
0.23
15.8
9.4
0.2
MAX.
3.5
3.3
0.1
1
0.25
0.53
0.32
16
9.8
MIN.
0.128
0.118
14.5
1.42
0.547
0.044
11.1
2.9
6.2
0.1
1.1
15.9
1.1
10°
0.429
inch
TYP.
0.124
0.031
0.006
0.016
0.09
0.622
0.370
0.008
1
13.9
1.12
0.039
1.27
11.43
10.9
5.8
0
15.5
0.8
0.437
0.114
.0244
0.004
0.043
0.626
0.043
10°
0.228
0.000
0.610
0.031
0.024
8°
7°
0°
5°
H
N
8°
7°
E3
A2
b
0.571
0.056
0.050
0.450
0.6
0°
5°
N
MAX.
0.138
0.130
0.039
0.039
0.010
0.021
0.013
0.630
0.386
R
A4
A5
A
c
V
e
D2 (x2) DETAIL A
e3
E2
E
M
h x 45˚
1
10
DETAIL A
E2
E1
0.35
Gage Plane
a1
S
L
-CSEATING PLANE
G
20
D1
C
(COPLANARITY)
11
PSO20DME
D
0088259-B
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LHC4913 SERIES
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consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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© 2002 STMicroelectronics - Printed in Italy - All Rights Reserved
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