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RH1185AMK Datasheet

Negative Regulator

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RH1185AMK
Negative Regulator with
Adjustable Current Limit
DESCRIPTION
The RH1185AMK is a 3A low dropout regulator with ad-
justable current limit and remote sense capability. It can
be used as a positive regulator with floating input or as
a standard negative regulator with grounded input. The
output voltage range is 2.5V to 25V, with ±1% accuracy
on the internal reference voltage.
The RH1185AMK uses a saturation-limited NPN transistor
as the pass element. This structure gives the linear dropout
characteristics of a FET pass element with significantly less
die area. High efficiency is maintained by using special
anti-saturation circuitry that adjusts base drive to track
load current.
The on-resistance is typically 0.25Ω. Accurate current
limit is programmed with a single 1/8W external resistor,
with a range of zero to three amperes. A second, fixed
internal limit circuit prevents destructive currents if the
programming current is accidentally overranged.
The RH1185AMK has all the protection features of previ-
ous LTC regulators, including power limiting and thermal
shutdown.
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage..............................................................35V
Input-Output Differential............................................30V
FB Voltage....................................................................7V
REF Voltage..................................................................7V
Output Voltage...........................................................30V
Output Reverse Voltage...............................................2V
Operating Ambient Temperature Range... –55°C to 125°C
Operating Junction Temperature Range
Control Section................................... –55°C to 150°C
Power Transistor Section.................... –55°C to 175°C
Storage Temperature Range.................... –65°C to 150°C
Thermal Resistance Junction to Case
TO-3 Control Area..............................................1°C/W
Power Transistor................................................3°C/W
Lead Temperature (Soldering, 10 sec)................... 300°C
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
BURN-IN CIRCUIT
15V
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4.02k
3
1
REF
GND
FB 2
VOUT 4
CASE
2k
2k
RH1185AMK BI
–15V
PACKAGE INFORMATION
GND
12
43
VOUT
K PACKAGE
4-LEAD TO-3 METAL CAN
FB
CASE
IS VIN
REF
rh1185amkfa
1


Linear Technology Electronic Components Datasheet

RH1185AMK Datasheet

Negative Regulator

No Preview Available !

RH1185AMK
TABLE 1: ELECTRICAL CHARACTERISTICS
(Preirradiation) VIN = 7.4V, VOUT = 5V, IOUT = 1mA, RLIM = 4.02k, unless otherwise noted.
PARAMETER AND CONDITIONS
TA = 25°C
MIN TYP
MAX
SUB-
GROUP
–55°C ≤ TA ≤ 125°C
MIN TYP MAX
Reference Voltage (At FB Pin)
2.37
2.37
Reference Voltage Tolerence (At FB Pin) (Note 2)
VIN – VOUT = 5V, VOUT = VREF
–1.0 0.3
1.0
1
Reference Voltage Tolerance
VIN – VOUT = 1.2V to VIN = 30V,
1mA
PTMD IN
2≤≤5TIWOJUT(NT≤oM3tAeAX6, ()N, VotOeU9T)=
5V,
–2.5
Feedback Pin Bias Current, VOUT = VREF
0.7 2
1
Dropout Voltage (Note 3)
IOUT = 0.5A, VOUT = 5V
IOUT = 3A, VOUT = 5V
0.2 0.37
0.67 1
1
1
Load Regulation (Note 7) IOUT = 5mA to 3A,
VIN – VOUT = 1.5V to 10V, VOUT = 5V
0.05 0.3
1
Line Regulation (Note 7)
VIN – VOUT = 1V to 20V, VOUT = 5V
0.002 0.01
1
Minimum Input Votlage (Note 4)
IOUT = 1A, VOUT = VREF
IOUT = 3A, VOUT = VREF
3.9 1
4.4 1
Internal Current Limit (See Graph for Guaranteed
Curve) (Note 12)
1V.I5NV–≤VOVUINT
=
V1O5UVT
10V
VIN – VOUT = 20V
VIN – VOUT = 30V
3.3 3.6 4.2 1 3.1
2 3 4.2 1 2
1 1.7 2.6 1
1
0.2 0.4
1
1 0.2
External Current Limit (Note 11)
RLIM = 5k, VOUT = 1V
RLIM = 15k, VOUT = 1V
2.7 3 3.3 1 2.5
0.9 1 1.1 1 0.8
Quiescent Supply Current (Note 5)
IOUT = 5mA, VOUT = VREF , 4V ≤ VIN ≤ 25V
2.5 3.5
1
Supply Current Change With Load
VVIINN
VVOOUUTT
=
V2VSAT
(Note
10)
25 1
15 1
Thermal Regulation
VIN – VOUT = 10V, IOUT = 5mA to 2A
Reference Voltage Temperature Coefficient (Note 8)
2.5
2
0.55
1.4
0.8
0.03
4.4
4.3
3
1.1
3.5
1.2
3.5
40
25
0.014
0.01
SUB-
GROUP
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
UNITS
V
%
%
µA
V
V
%
%/V
V
V
A
A
A
A
A
A
mA
mA
mA
%/W
%/°C
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2
rh1185amkfa


Part Number RH1185AMK
Description Negative Regulator
Maker Linear Technology
Total Page 6 Pages
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