RH1185AMK Datasheet, PDF (1/6 Pages) Linear Technology – Negative Regulator with Adjustable Current Limit

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
4.02k
3
1
REF
GND
FB ²
2k
V_OUT ⁴
2k
RH1185AMK BI
CASE
–15V
PACKAGE INFORMATION
GND
1
2
4
3
V_OUT
K PACKAGE
4-LEAD TO-3 METAL CAN
FB
CASE
IS V_IN
REF
rh1185amkfa
1