3
SCD8651 Rev D 2/27/09 Aeroflex Plainview
RH1185 Negative LDO section only 1/, 9/
Reference Voltage
(At pin 6) 9/VREF 1mA < IOUT < 3A, VIN - VOUT = 1.2V to 28V, VOUT = -5V -2.29 -2.45 V
Dropout Voltage 6/VDROP
IOUT = 0.5A, VOUT = -5V -0.425V
IOUT = 3A, VOUT = -5V -1.05V
Line Regulation 10/1.0V < VIN - VOUT < 20V, VOUT = -5V - 0.02 %/V
Load Regulation 10/5mA < IOUT < 3A, VIN - VOUT = 1.5V to 10V, VOUT = -5V - 0.8 %
Minimum Input Voltage 7/VIN MIN IOUT = 3A , VOUT = VREF - -4.50 V
Internal Current Limit (See
Graph for Guaranteed Curve -
See Figure 6)
ICL
1.5V < VIN - VOUT < 10V 3.3 4.55 A
VIN - VOUT = 15V 2.0 4.5 A
VIN - VOUT = 20V 1.0 3.1 A
VIN - VOUT = 30V 5/0.21.6A
External Current Limit ILIM
RLIM = 5KΩ 12/ 2.7 3.7 A
RLIM = 15KΩ 12/ 0.9 1.6 A
Quiescent Supply Current 8/IQIOUT = 5mA, VOUT = VREF, -4V < VIN < -25V - 3.5 mA
Supply Current
Change with Load IQΔ
VIN – VOUT = VSAT 11/ - 35 mA/A
VIN – VOUT ≥ 2V -21mA/A
Ripple Rejection - IOUT = 1.0A, VIN - VOUT = 3V, f = 120Hz, 60 - dB
Thermal Regulation (See
application information
LT1185) 5/
-VIN –VOUT = 10V, IOUT = 5mA to 2A, TC = +25°C - 0.014 %/W
Notes
1. Meets ESD testing per MIL-STD-883, method 3015, Class 2.
2. Unless otherwise specified, these specifications apply for post radiation and -55°C < Tc < +125°C.
3. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the input/output
differential voltage and the output current. Guaranteed maximum power dissipation will not be available over the full input/output voltage
range.
4. Dropout voltage is specified over the full output current range of the device.
5. Not tested. Shall be guaranteed by design, characterization, or correlation to other tested parameters.
6. 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 x IOUT). For load current less than 0.5A, see Figure 4.
7. “Minimum input voltage” is limited by base emitter voltage drive of the power transistor section, not saturation as measured in Note 6. For
output voltages below 4V, “minimum input voltage” specification may limit dropout voltage before transistor saturation limitation.
8. Supply current is measured on the ground pin, and does not include load current, RLIM, or output divider current.
9. 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.
10. 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.
11. VSAT is the maximum specified dropout voltage; 0.25V +(0.25Ω x IOUT).
12. Current limit is programmed with a resistor from REF pin to GND pin. RLIM = 15KΩ/ILIM.
13. For compliance with MIL-STD- 883 revision C current density specification, the RH1086MK is derated to 1 Amp but is capable of
1.5 Amps
ELECTRICAL PERFORMANCE CHARACTERISTICS 2/ (con’t)
PARAMETER SYM CONDITIONS (P ≤PMAX)M I N M A X U N I T S