DICE/DWF SPECIFICATION
1
RH1185MK
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
PAD FUNCTION
1.
2.
3.
4.
5.
REF
VIN
VOUT
GND
FB
110mils × 116mils
Backside metal: Alloyed Gold Layer
Backside Potential: VIN Pads 2
DIE CROSS REFERENCE
LTC Finished
Part Number
Order
Part Number
RH1185MK
RH1185MK
RH1185MK DICE
RH1185MK DWF*
Please refer to LTC standard product data sheet for
other applicable product information.
*DWF = DICE in wafer form.
Negative Regulator with
Adjustable Current Limit
DICE/DWF ELECTRICAL TEST LIMITS
V
IN = 7.4V, VOUT = 5V, IOUT = 1mA, RLIM = 4.02k,
unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage (at FB Pin, Note 2) VIN – VOUT = 5V, VOUT = VREF –2.344 –2.37 –2.396 V
Feedback Pin Bias Current VOUT = VREF 2μA
Dropout Voltage (Note 3) IOUT = 0.5A, VOUT = 5V
IOUT = 3A, VOUT = 5V
0.4
1.05
V
V
Line Regulation (Note 6) VIN – VOUT = 1V to 20V, VOUT = 5V 0.01 %/V
Minimum Input Voltage (Note 4) IOUT = 1A, VOUT = VREF 4.5 V
Internal Current Limit (Note 8) VIN – VOUT = 1.5V
VIN – VOUT = 20V
VIN – VOUT = 30V
3.3
1
0.2
4.2
2.6
1
A
A
A
External Current Limit (Note 7) RLIM = 5k, VOUT = 1V
RLIM = 15k, VOUT = 1V
2.7
0.9
3.3
1.1
A
A
Quiescent Supply Current (Note 5) IOUT = 5mA, VOUT = VREF
, 4V ≤ VIN ≤ 25V 3.5 mA
REF Pin Shutoff Current 11 19 μA
1
232
4
4
5
Note 1: Dice are probe tested at 25°C to the limits shown except for high
current tests. Dice are tested under low current conditions which assure
full load current specifi cations when assembled in packaging systems
approved by Linear Technology. For absolute maximum ratings, typical
specifi cations, performance curves and fi nished product specifi cations,
please refer to the standard product RH data sheet.
Note 2: Testing is done using a pulsed low duty cycle technique. See
thermal regulation specifi cations in the LT1185 data sheet for output
changes due to heating effects.
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.
DICE/DWF SPECIFICATION
2
RH1185MK
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2009
LT 1109 REV B • PRINTED IN USA
Wafer level testing is performed per the indicated specifi cations for dice. Considerable differences in performance can often be observed for dice versus
packaged units due to the infl uences of packaging and assembly on certain devices and/or parameters. Please consult factory for more information
on dice performance and lot qualifi cations via lot sampling test procedures.
Dice data sheet subject to change. Please consult factory for current revision in production.
I.D.No. 66-13-1185MK
DICE/DWF ELECTRICAL TEST LIMITS
V
IN = 7.4V, VOUT = 5V, IOUT = 1mA, RLIM = 4.02k,
unless otherwise noted.
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 the graph in the 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 specifi cation may limit
dropout voltage before transistor saturation limit.
Note 5: Supply current is measured on the ground pin, and does not
include load current, RLIM, or output divider current.
Note 6: Line regulation is measured on a pulse basis with a pulse
width of ≈2ms to minimize heating. DC regulation will be affected by
thermal regulation and temperature coeffi cient of the reference. See the
Applications Information section of the LT1185 data sheet for details.
Note 7: External current limit is programmed with a resistor from REF pin
to GND pin. The value is 15K • A/ILIMIT
.
Note 8: For VIN – VOUT = 1.5V, VIN = 5V and VOUT = 3.5V. For all other
current limit tests VOUT = 1V.
