RH1185AMK Datasheet, PDF (3/6 Pages) Linear Technology – Negative Regulator with Adjustable Current Limit

RH1185AMK
TABLE 1A: ELECTRICAL CHARACTERISTICS
(Postirradiation)
PARAMETER AND CONDITONS
Reference Voltage Tolerance
V_IN – V_OUT = 5V, V_OUT = V_REF
Reference Voltage Tolerance
V_IN – V_OUT = 1.2V to V_IN = 30V,
1mA ≤ I_OUT ≤ 3A,
P_D ≤ 25W (Note 6), V_OUT = 5V,
T_MIN ≤ T_J ≤ T_MAX (Note 9)
Feedback PIn Bias Current, V_OUT = V_REF
Dropout Voltage (Note 3)
I_OUT = 0.5A, V_OUT = 5V
I_OUT = 3A, V_OUT = 5V
Load Regulation (Note 7) I_OUT = 5mA to 3A
V_IN – V_OUT = 1.5V to 10V, V_OUT = 5V
Line Regulation, Absolute Value (Note 7)
V_IN – V_OUT = 1V to 20V, V_OUT = 5V
Minimum Input Voltage (Note 4)
I_OUT = 1A, V_OUT = V_REF
I_OUT = 3A, V_OUT = V_REF
Internal Current Limit (Note 12)
1.5V ≤ V_IN – V_OUT ≤ 10V
V_IN – V_OUT = 15V
V_IN – V_OUT = 20V
V_IN – V_OUT = 30V
External Current Limit (Note 11)
R_LIM = 5k
R_LIM = 15k
Quiescent Supply Current
I_OUT = 5mA, V_OUT = V_REF , 4V ≤ V_IN ≤ 25V
Supply Current Change With Load
V_IN – V_OUT = V_SAT
V_IN – V_OUT ≥ 2V
10KRAD(Si)
MIN MAX
–1.2 1.2
–3
3
20KRAD(Si)
MIN MAX
–1.2 1.2
–3
3
50KRAD(Si)
MIN MAX
–1.5 1.5
–3.2 3.2
2
2
2.5
0.4
0.4
0.4
1
1
1
0.3
0.4
0.5
0.01
0.01
0.01
3.9
3.9
3.9
4.4
4.4
4.4
3.3 4.3
3.3
4.3
3.3
4.4
2 4.3
2
4.3
2
4.35
1 2.7
1
2.75
1
2.85
0.2 1
0.2
1.15 0.2
1.3
2.7 3.3
2.7
3.4
2.7
3.5
0.9 1.1
0.9
1.25 0.9
1.4
3.5
3.5
3.5
25
27
30
15
16
18
100KRAD(Si)
MIN MAX
–1.5 1.5
–3.5 3.5
3
0.425
1.05
0.8
0.02
4
4.5
3.3 4.55
2
4.5
1
3.1
0.2
1.6
2.7
3.7
0.9
1.6
3.5
35
21
200KRAD(Si)
MIN MAX UNITS
–2
2
%
–4
4
%
3
µA
0.45
V
1.1
V
1
%
0.05
%/V
4
V
4.5
V
3.3 4.75
A
2
4.7
A
1
3.3
A
0.2
2
A
2.7
3.9
A
0.9
1.9
A
3.5
mA
45 mA/A
27 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; V_DROPOUT = 0.25V + 0.25Ω • I_OUT . 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, R_LIM, 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: T_JMIN = –55°C for the RH1185AMK. Power transistor area and
control circuit area have different maximum junction temperatures. Control
area limit is T_JMAX = 150°C for the RH1185AMK. Power area limit is 175°C
for RH1185AMK.
Note 10: V_SAT is the maximum specified dropout voltage;
0.25V + 0.25Ω • I_OUT .
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 V_IN – V_OUT = 1.5V, V_IN = 5V and V_OUT = 3.5V. For all other
current limit tests, V_OUT = 1.0V
rh1185amkfa
3