LINER RH1185AMK

RH1185AMK
Negative Regulator with
Adjustable Current Limit
DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
The RH1185AMK is a 3A low dropout regulator with adjustable 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.
(Note 1)
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 previous LTC regulators, including power limiting and thermal
shutdown.
BURN-IN CIRCUIT
GND
4.02k
3
GND
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.
PACKAGE INFORMATION
15V
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
REF
FB
VOUT
CASE
2
4
1
2k
4
2k
RH1185AMK BI
FB
2
CASE
IS VIN
3
VOUT
REF
K PACKAGE
4-LEAD TO-3 METAL CAN
–15V
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RH1185AMK
TABLE 1: ELECTRICAL CHARACTERISTICS
(Preirradiation) VIN = 7.4V, VOUT = 5V, IOUT = 1mA, RLIM = 4.02k, unless otherwise noted.
PARAMETER AND CONDITIONS
MIN
Reference Voltage (At FB Pin)
Reference Voltage Tolerence (At FB Pin) (Note 2)
VIN – VOUT = 5V, VOUT = VREF
TA = 25°C
TYP
MAX
SUBGROUP
–55°C ≤ TA ≤ 125°C
MIN
TYP
MAX
2.37
–1.0
0.3
SUBGROUP
2.37
1.0
V
1
Reference Voltage Tolerance
VIN – VOUT = 1.2V to VIN = 30V,
1mA ≤ IOUT ≤ 3A,
PD ≤ 25W (Note 6), VOUT = 5V,
TMIN ≤ TJ ≤ TMAX (Note 9)
UNITS
%
–2.5
2.5
2, 3
%
Feedback Pin Bias Current, VOUT = VREF
0.7
2
1
2
2, 3
µA
Dropout Voltage (Note 3)
IOUT = 0.5A, VOUT = 5V
IOUT = 3A, VOUT = 5V
0.2
0.67
0.37
1
1
1
0.55
1.4
2, 3
2, 3
V
V
Load Regulation (Note 7) IOUT = 5mA to 3A,
VIN – VOUT = 1.5V to 10V, VOUT = 5V
0.05
0.3
1
0.8
2, 3
%
Line Regulation (Note 7)
VIN – VOUT = 1V to 20V, VOUT = 5V
0.002
0.01
1
0.03
2, 3
%/V
3.9
4.4
1
1
Minimum Input Votlage (Note 4)
IOUT = 1A, VOUT = VREF
IOUT = 3A, VOUT = VREF
V
V
Internal Current Limit (See Graph for Guaranteed
Curve) (Note 12)
1.5V ≤ VIN – VOUT ≤ 10V
VIN – VOUT = 15V
VIN – VOUT = 20V
VIN – VOUT = 30V
3.3
2
1
0.2
3.6
3
1.7
0.4
4.2
4.2
2.6
1
1
1
1
1
3.1
2
1
0.2
4.4
4.3
3
1.1
2, 3
2, 3
2, 3
2, 3
A
A
A
A
External Current Limit (Note 11)
RLIM = 5k, VOUT = 1V
RLIM = 15k, VOUT = 1V
2.7
0.9
3
1
3.3
1.1
1
1
2.5
0.8
3.5
1.2
2, 3
2, 3
A
A
2.5
3.5
1
3.5
2, 3
mA
25
15
1
1
40
25
2, 3
2, 3
mA
mA
Quiescent Supply Current (Note 5)
IOUT = 5mA, VOUT = VREF , 4V ≤ VIN ≤ 25V
Supply Current Change With Load
VIN – VOUT = VSAT (Note 10)
VIN – VOUT ≥ 2V
Thermal Regulation
VIN – VOUT = 10V, IOUT = 5mA to 2A
0.014
%/W
Reference Voltage Temperature Coefficient (Note 8)
0.01
%/°C
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RH1185AMK
TABLE 1A: ELECTRICAL CHARACTERISTICS
(Postirradiation)
PARAMETER AND CONDITONS
Reference Voltage Tolerance
VIN – VOUT = 5V, VOUT = VREF
Reference Voltage Tolerance
VIN – VOUT = 1.2V to VIN = 30V,
1mA ≤ IOUT ≤ 3A,
PD ≤ 25W (Note 6), VOUT = 5V,
TMIN ≤ TJ ≤ TMAX (Note 9)
Feedback PIn Bias Current, VOUT = VREF
Dropout Voltage (Note 3)
IOUT = 0.5A, VOUT = 5V
IOUT = 3A, VOUT = 5V
Load Regulation (Note 7) IOUT = 5mA to 3A
VIN – VOUT = 1.5V to 10V, VOUT = 5V
Line Regulation, Absolute Value (Note 7)
VIN – VOUT = 1V to 20V, VOUT = 5V
Minimum Input Voltage (Note 4)
IOUT = 1A, VOUT = VREF
IOUT = 3A, VOUT = VREF
Internal Current Limit (Note 12)
1.5V ≤ VIN – VOUT ≤ 10V
VIN – VOUT = 15V
VIN – VOUT = 20V
VIN – VOUT = 30V
External Current Limit (Note 11)
RLIM = 5k
RLIM = 15k
Quiescent Supply Current
IOUT = 5mA, VOUT = VREF , 4V ≤ VIN ≤ 25V
Supply Current Change With Load
VIN – VOUT = VSAT
VIN – VOUT ≥ 2V
10KRAD(Si)
MIN
MAX
20KRAD(Si)
MIN
MAX
50KRAD(Si)
MIN
MAX
100KRAD(Si)
MIN
MAX
200KRAD(Si)
MIN
MAX
–1.2
1.2
–1.2
1.2
–1.5
1.5
–1.5
1.5
–2
2
%
–3
3
–3
3
–3.2
3.2
–3.5
3.5
–4
4
%
UNITS
2
2
2.5
3
3
µA
0.4
1
0.4
1
0.4
1
0.425
1.05
0.45
1.1
V
V
0.3
0.4
0.5
0.8
1
%
0.01
0.01
0.01
0.02
0.05
%/V
3.9
4.4
3.9
4.4
3.9
4.4
4
4.5
4
4.5
V
V
3.3
2
1
0.2
4.3
4.3
2.7
1
3.3
2
1
0.2
4.3
4.3
2.75
1.15
3.3
2
1
0.2
4.4
4.35
2.85
1.3
3.3
2
1
0.2
4.55
4.5
3.1
1.6
3.3
2
1
0.2
4.75
4.7
3.3
2
A
A
A
A
2.7
0.9
3.3
1.1
2.7
0.9
3.4
1.25
2.7
0.9
3.5
1.4
2.7
0.9
3.7
1.6
2.7
0.9
3.9
1.9
A
A
3.5
3.5
3.5
3.5
3.5
mA
25
15
27
16
30
18
35
21
45
27
mA/A
mA/A
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Reference voltage is guaranteed both at nominal conditions
(no load, 25°C) and at worst-case conditions of load, line, power and
temperature.
Note 3: Dropout voltage is tested by reducing input voltage until the
output drops 1% below its nominal value. Tests are done at 0.5A and 3A.
The power transistor looks basically like a pure resistance in this range
so that minimum differential at any intermediate current can be calculated
by interpolation; VDROPOUT = 0.25V + 0.25Ω • IOUT . For load current other
than 0.5A and 3.0A, see graph in LT1185 data sheet.
Note 4: “Minimum input voltage” is limited by base emitter voltage drive
of the power transistor section, not saturation as measured in Note 3. For
output voltages below 4V, “minimum input voltage” specification may limit
dropout voltage before transistor saturation limitation.
Note 5: Supply current is measured on the ground pin, and does not
include load current, RLIM, or output divider current.
Note 6: The 25W power level is guaranteed for an input-output voltage of
8.3V to 17V. At lower voltages the 3A limit applies, and at higher voltages
the internal power limiting may restrict regulator power below 25W. See
graph of Internal Current Limit in LT1185 data sheet.
Note 7: Line and load regulation are measured on a pulse basis with a
pulse width of ≈2ms, to minimize heating. DC regulation will be affected
by thermal regulation and temperature coefficient of the reference. See the
Applications Information section of LT1185 data sheet for details.
Note 8: Guaranteed by design and correlation to other tests, but not tested.
Note 9: TJMIN = –55°C for the RH1185AMK. Power transistor area and
control circuit area have different maximum junction temperatures. Control
area limit is TJMAX = 150°C for the RH1185AMK. Power area limit is 175°C
for RH1185AMK.
Note 10: VSAT is the maximum specified dropout voltage;
0.25V + 0.25Ω • IOUT .
Note 11: Current limit is programmed with a resistor from REF pin to GND
pin. The value is 15k • A/I-limit.
Note 12: For VIN – VOUT = 1.5V, VIN = 5V and VOUT = 3.5V. For all other
current limit tests, VOUT = 1.0V
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RH1185AMK
TABLE 2: POST BURN-IN ENDPOINTS AND DELTA LIMITS
REQUIREMENTS TA = 25°C
PARAMETER AND
CONDITIONS
Reference Voltage, VREF
VIN = 7.4V, VOUT = VREF
ENDPOINT LIMITS
MIN
MAX
2.346
2.394
DELTA LIMITS
MIN
MAX
–0.040
UNITS
0.040
V
TABLE 3: ELECTRICAL TEST REQUIREMENTS
MIL-STD-883 TEST REQUIREMENTS
PDA Test Notes
The PDA is specified as 5% based on failures from Group A, Subgroup 1,
tests after cooldown as the final electrical test in accordance with method
5004 of MIL-STD-883. The verified failures of Group A, Subgroup 1, after
burn-in divided by the total number of devices submitted for burn-in in that
lot shall be used to determine the percent for the lot.
Linear Technology Corporation reserves the right to test to tighter limits
than those given.
SUBGROUP
Final Electrical Test Requirements (Method 5004)
1*, 2, 3
Group A Test Requirements (Method 5005)
1, 2, 3
Group B and D for Class S,
End Point Electrical Parameters (Method 5005)
1, 2, 3
*PDA applies to subgroup 1. See PDA Test Notes.
TOTAL DOSE BIAS CIRCUIT
15V
5k
3
1
GND
REF
FB
VOUT
2
4
4k
4k
OUT
RH1185AMK DOSE
CASE
IN
–15V
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RH1185AMK
REVISION HISTORY
REV
DATE
DESCRIPTION
PAGE NUMBER
A
02/11
Changed title from RH1185MK to RH1185AMK.
Revised Description.
Removed REF Pin Shutoff Current from Tables 1 and Table 1A Electrical Characteristics.
Removed REF Pin Shutoff Current Plot from the Typical Performance Characteristics section.
1-6
1
2, 3
6
rh1185amkfa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
5
RH1185AMK
TYPICAL PERFORMANCE CHARACTERISTICS
VREF
VIN – VOUT = 5V
VOUT = VREF
–2.350
FB Pin Bias Current
Quiescent Supply Current
3.5
–2.355
VREF (V)
–2.365
–2.370
–2.375
–2.380
IOUT = 5mA
VIN = 25V
VOUT = VREF
3.0
SUPPLY CURRENT (mA)
–2.360
2.0
FB BIAS CURRENT (µA)
–2.345
2.5
2.0
–2.385
1.5
1.0
0.5
–2.390
–2.395
0
1.5
200
100
50
150
TOTAL DOSE (kRads)
0
50
100
150
TOTAL DOSE (kRads)
Line Regulation
50
100
150
TOTAL DOSE (kRads)
200
RH1185AMK G03
Load Regulation
0
VIN – VOUT = 1V TO 20V
VOUT = 5V
IOUT = 5mA TO 3A
VOUT = 5V
–0.05
0.005
LOAD REGULATION (%)
LINE REGULATION (%/V)
0
RH1185AMK G02
RH1185AMK G01
0.010
0
200
–0.10
0
–0.15
–0.20
–0.005
–0.25
–0.010
0
50
100
150
TOTAL DOSE (kRads)
200
–0.30
0
50
100
150
TOTAL DOSE (kRads)
RH1185AMK G04
RH1185AMK G05
External Current Limit
Internal Current Limit
5.0
3.5
4.5
RLIM = 5k
INTERNAL CURRENT LIMIT (A)
EXTERNAL CURRENT LIMIT (A)
4.0
3.0
2.5
2.0
1.5
RLIM = 15k
1.0
0.5
0
200
4.0
VIN – VOUT = 5V
3.5
VIN – VOUT = 10V
3.0
VIN – VOUT = 15V
2.5
VIN – VOUT = 20V
2.0
1.5
1.0
VIN – VOUT = 30V
0.5
0
100
50
150
TOTAL DOSE (kRads)
200
RH1185AMK G06
0
0
100
50
150
TOTAL DOSE (kRads)
200
RH1185AMK G07
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Linear Technology Corporation
ID No. 66-11-1185MK • LT 0211 REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
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 LINEAR TECHNOLOGY CORPORATION 2009