Replacement of
LT1117-XX
MIK1117-XX
800 mA Low Dropout Positive
Voltage Regulator
February 2000
Description
The MIK1117 series of positive adjustable and fixed regulators are designed to provide 800mA with higher efficiency than currently
available devices. All internal circuitry is designed to operate down to 700 mV input to output differential and the dropout voltage is fully
specified as a function of load current. Dropout voltage of the device is 100 mV at light loads and rising to 700 mV at maximum output
current. A second low current input is required to achieve this dropout. The MIK1117 can also be used as a single supply device (3 pin
version). On-chip trimming adjusts the reference voltage to 1%.
Features
Adjustable or Fixed Output
Output Current of 800mA
Low Dropout, 700 mV at 800mA Output Current
0.015% Line Regulation
0.01% Load Regulation
100% Thermal Limit Burn-In
Fast Transient Response
Remote Sense
Applications
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Adjustable Power Supply
Typical application data 2.5V,
800mA regulator
V
POWER
V
CONTROL
V
OUT
V
SENSE
Load
MIK1117
1 F
10V
5V
3.3V
10 F
5V
0.1 F
5V
150 F
5V
2.5V@800mA
R1
124
1%
R2
124
1%
V
OUT
=
I
R2
ADJ
V
(1+R2/R1) +
REF
Adjust
Package information
Absolute Maximum Ratings
Symbol Parameter
Maximum
Units
P
D
Power Dissipation
Internally Limited
W
V
IN
Input Voltage
Vpower
Vcontrol
7
13
V
T
J
Operating Junction Temperature Range
Control Section
Power Transistor
0 to 125
0 to150
o
C
T
STG
Storage Temperature
-65 to 150
o
C
T
LEAD
Lead Temperature (Soldering, 10 sec)
300
o
C
Device Selection Guide
(Note1)
Device Output
Voltage
MIK1117 Adj
MIK1117-1.5 1.5V
MIK1117-2.5 2.5V
MIK1117-2.85 2.85V
MIK1117-3.0 3.0V
MIK1117-3.3 3.3V
MIK1117-3.5 3.5V
MIK1117-5.0 5.0V
Note 1: Other fixed versions are available Vout = 1.5V to 5.0V
Page 1 of 5
Replacement of
LT1117-XX
MIK1117-XX
800 mA Low Dropout Positive
Voltage Regulator
February 2000
Electrical Characteristics
(Note 1)
Electrical Characteristics at I
LOAD
= 0 mA and T
J
= +25
C unless otherwise specified.
Parameter Device
Test
Conditions
Min
Typ
Max
Units
Reference Voltage
MIK1117
V
CONTROL
= 2.75V, V
POWER
= 2V, I
LOAD
= 10mA
V
CONTROL
= 2.7V to 12V,
V
POWER
= 3.3V to 5.5V, I
LOAD
= 10mA to 800mA
*
1.238
1.230
1.250
1.250
1.262
1.270
V
MIK1117-1.5 V
CONTROL
= 4V, V
POWER
= 2V
V
CONTROL
= 3V, V
POWER
= 2.3V, I
LOAD
= 0mA to 800mA
*
1.485
1.475
1.500
1.500
1.515
1.525
V
MIK1117-2.5 V
CONTROL
= 5V, V
POWER
= 3.3V
V
CONTROL
= 4V, V
POWER
= 3.3V, I
LOAD
= 0mA to 800mA
*
2.475
2.460
2.500
2.500
2.525
2.540
V
MIK1117-2.85 V
CONTROL
= 5.35V, V
POWER
= 3.35V
V
CONTROL
= 4.4V, V
POWER
= 3.7V, I
LOAD
= 0mA to 800mA
*
2.821
2.805
2.850
2.850
2.879
2.895
V
MIK1117-3.0 V
CONTROL
= 5.5V, V
POWER
= 3.5V
V
CONTROL
= 4.5V, V
POWER
= 3.8V, I
LOAD
= 0mA to 800mA
*
2.970
2.950
3.000
3.000
3.030
3.050
V
MIK1117-3.3 V
CONTROL
= 5.8V, V
POWER
= 3.8V
V
CONTROL
= 4.8V, V
POWER
= 4.1V, I
LOAD
= 0mA to 800mA
*
3.267
3.247
3.300
3.300
3.333
3.353
V
MIK1117-3.5 V
CONTROL
= 6V, V
POWER
= 4V
V
CONTROL
= 5V, V
POWER
= 4.3V, I
LOAD
= 0mA to 800mA
*
3.465
3.445
3.500
3.500
3.535
3.555
V
Output Voltage
MIK1117-5.0 V
CONTROL
= 7.5V, V
POWER
= 5.5V
V
CONTROL
= 6.5V, V
POWER
= 5.8V, I
LOAD
= 0mA to 800mA
*
4.950
4.920
5.000
5.000
5.050
5.080
V
Line Regulation
All
I
LOAD
= 10mA, (1.5V+ V
OUT
)
V
CONTROL
12V,
0.8V
(V
POWER
- V
OUT
)
5.5V
*
0.04
0.20
%
Load Regulation
All
V
CONTROL
= V
OUT
+2.5V, V
POWER
= V
OUT
+ 0.8V,
I
LOAD
= 10mA to 800mA
* 0.08
0.40 %
Minimum Load
Current (Note 2)
MIK1117 V
CONTROL
= 5V, V
POWER
= 3.3V, V
ADJ
= 0V
*
1.7
5
mA
Control Pin Current
(Note3)
All V
CONTROL
= V
OUT
+2.5V, V
POWER
= V
OUT
+ 0.8V,
I
LOAD
= 10mA to 800mA
*
10
20
mA
Ground Pin Current
MIK1117-1.5/
-2.5/-2.85/
-3.0/-3.3/-3.5/-
5.0
V
CONTROL
= V
OUT
+2.5V, V
POWER
= V
OUT
+ 0.8V,
I
LOAD
= 10mA to 800mA
* 6 10 mA
Adjust Pin Current
MIK1117
V
CONTROL
= 2.75V, V
POWER
= 2.05V,
I
LOAD
= 10mA
* 50 120 A
Current Limit
All
(V
IN
- V
OUT
) = 3V
*
800
1100
mA
Ripple Rejection
All
V
CONTROL
= V
POWER
= V
OUT
+ 2.5V, V
RIPPLE
= 1V
P-P
,
I
LOAD
= 400mA
60 75 dB
Thermal Regulation
MIK1117
T
A
= 25
C, 30 ms pulse
0.003 %/W
Dropout Voltage Note 4
Control Input
(V
CONTROL
- V
OUT
)
All V
POWER
= V
OUT
+0.8V, I
LOAD
= 10mA
V
POWER
= V
OUT
+ 0.8V, I
LOAD
= 800mA
*
*
1.00
1.15
1.15
1.30
V
Power Input
(V
POWER
- V
OUT
)
All V
CONTROL
= V
OUT
+ 2.5V, I
LOAD
= 800mA
*
0.55
0.70
V
The * denotes the specifications which apply over the full temperature range.
Note 1: Unless otherwise specified Vout = Vsense. For MIK1117 (adj) Vadj = 0V
Note 2: For the adjustable device the minimum load current is the minimum current required to maintain regulation. Normally the current
in the resistor divider used to set the output voltage is selected to meet the minimum load current requirement.
Note 3: The control pin current is the drive current required for the output transistor. This current will track output current with a ratio of
about 1:100.
Note 4: The dropout voltage for the MIK1117 is caused by either minimum control voltage or minimum power voltage.
The specifications represent the minimum input/output voltage required to maintain 1% regulation.
Page 2 of 5
Replacement of
LT1117-XX
MIK1117-XX
800 mA Low Dropout Positive
Voltage Regulator
February 2000
Pin Functions (5-Lead)
Sense (Pin 1): This pin is the positive side of the reference
voltage. With this pin it is possible to Kelvin sense the output
voltage at the load.
Adjust (Pin 2): This pin is the negative side of the reference
voltage. Adding a small bypass capacitor from the Adjust pin to
ground improves the transient response. For fixed voltage
devices the Adjust pin is also brought out to allow the user to
add a bypass capacitor.
GND (Pin 2): For fixed voltage devices this is the bottom of the
resistor divider that sets the output voltage.
V
POWER
(Pin 5): This pin is the collector of the power transistor.
The output load current is supplied through this pin. The
voltage at this pin must be 0.7V greater than the output voltage
for the device to regulate.
V
CONTROL
(Pin 4): This pin is the supply pin for the control
circuitry. The current flow into this pin will be about 1% of the
output current. The voltage at this pin must be 1.3V greater
than the output voltage for the device to regulate.
Output (Pin 3): This is the power output of the device.
Block Diagram
Page 3 of 5
Replacement of
LT1117-XX
MIK1117-XX
800 mA Low Dropout Positive
Voltage Regulator
February 2000
Application Information
The MIK1117 is designed to make use of multiple
power supplies, to reduce the dropout voltage. One of the
advantages of the two supply approach is maximizing the
efficiency.
The second supply is at least 1V greater than output
voltage and is providing the power for the control circuitry and
supplies the drive current to the NPN output transistor. This
allows the NPN output transistor to be driven into saturation.
For the control voltage the current requirement is small equal
to about 1% of the output current. This drive current becomes
part of the output current. The maximum voltage on the Control
pin is 12V. The maximum voltage at the Power pin is 7V. By
tying the control and power inputs together the MIK1117 can
also be operated as a single supply device. In single supply
operation the dropout will be determined by the minimum
control voltage.
Both the fixed and adjustable versions have remote
sense pins, permitting very accurate regulation of output
voltage. As a result, over an output current range of 100mA to
800mA, the typical load regulation is less than 1mV. For the
fixed voltages the adjust pin is brought out allowing the user to
improve transient response by bypassing the internal resistor
divider. Optimum transient response is provided using a
capacitor in the range of 0.1
F to 1F for bypassing the Adjust
pin.
In addition to the enhancements mentioned, the
reference accuracy has been improved a factor of two with a
quaranteed initial tolerance of
1% at 25
0
C and 1.6% accuracy
over the full temperature and load current range.
Typical applications for the MIK1117 include 3.3V to 2.5V
conversion with a 5V control supply, 5V to 4.2V conversion
with a 12V control supply or 5V to 3.6V conversion with a 12V
control supply. The device is fully protected against
overcurrent and overtemperature conditions.
Grounding and Output Sensing
The MIK1117 allows true Kelvin sensing for both the
high and low side of the load. As a result the voltage regulation
at the load can be easily optimized. Voltage drops due to
parasitic resistances between the regulator and the load can
be placed inside the regulation loop. The advantages of
remote sensing are illustrated in figures 1 through 3.
Figure 1 shows the device connected as a
conventional 3 terminal regulator with the Sense lead
connected directly to the output of the device. R
P
is the
parasitic resistance of the connections between the device and
the load. Trace A of figure 3 illustrates the effect of Rp.
Figure 2 shows the device connected to take
advantage of the remote sense feature. The Sense pin and the
top of the resistor divider are connected to the top of the load;
the bottom of the resistor divider is connected to the bottom of
the load. The effect on output regulation can be seen in trace
B of figure 3.
It is important to note that the voltage drops due to
R
P
are not eliminated; they will add to the dropout voltage of
the regulator regardless. The MIK1117 can control the voltage
at the load as long as the input-output voltage is greater than
the total of the dropout voltage of the device plus the voltage
drop across R
P
.
POWER
SENSE
OUTPUT
ADJ
R
P
R
P
CONTROL
MIK1117
3.3V
5.0V
LOAD
R2
R1
Figure 1. Conventional Load Sensing
POWER
SENSE
OUTPUT
ADJ
R
P
R1
R2
R
P
CONTROL
MIK1117
3.3V
5.0V
LOAD
Figure 2. Remote Load Sensing
V
OUT
V
OUT
FIGURE 1
A
B
FIGURE 2
TIME
I
OUT
(I
)(R )
OUT
P
Figure 3. Remote Sensing Improves Load Regulation
Stability
The circuit design used in the MIK1117 series requires the use
of an output capacitor as part of the device frequency
compensation. The addition of 150
F aluminum electrolytic or
a 22
F solid tantalum on the output will ensure stability for all
operating conditions.
Page 4 of 5
Replacement of
LT1117-XX
MIK1117-XX
800 mA Low Dropout Positive
Voltage Regulator
February 2000
Output Voltage
The MIK1117 (adjustable version) develops a 1.25V
reference voltage between the Sense pin and the Adjust pin
(Figure 4). Placing a resistor between these two terminals
causes a constant current to flow though R1 and down though
R2 to set the output voltage. In general R1 is chosen so that
this current is the specified minimum load current of 10 mA.
The current out of the Adjust pin is small, typically 50
A and it
adds to the current from R1. For best regulation the top of the
resistor divider should be connected directly to the Sense pin.
POWER
SENSE
OUTPUT
ADJ
R1
R2
V
OUT
I
ADJ
50 A
V
REF
V
OUT
=
I
R2
ADJ
V
(1+R2/R1) +
REF
V
POWER
V
CONTROL
CONTROL
MIK1117
+
+
+
Figure 4. Setting Output Voltage
Protection Diodes
In normal operation MIK1117 family does not need
any protection diodes between the adjustment pin and the
output and from the output to the input to prevent die
overstress. Internal resistors are limiting the internal current
paths on the ADJ pin. Therefore even with bypass capacitors
on the adjust pin no protection diode is needed to ensure
device safety under short-circuit conditions. The Adjust pin can
be driver on a transient basis
7V with respect to the output
without any device degradation.
A protection diode between the Output pin and
V
POWER
pin is not usually needed. Microsecond surge currents
of 50A to 100A can be handled by the internal diode between
the Output pin and V
POWER
pin of the device. In normal
operations it is difficult to get those values of surge currents
even with the use of large output capacitances. Only with high
value output capacitors, such as 1000
F to 5000F and the
V
POWER
pin is instantaneously shorted to ground, damage can
occur. A diode from output to input is recommended (Figure 5).
POWER
SENSE
OUTPUT
ADJ
D1
D2
R1
R2
V
OUT
V
POWER
V
CONTROL
CONTROL
MIK1117
+
+
+
Figure 5. Optional Clamp Diodes Protect Against Input
Crowbar Circuits
If MIK1117 is connected as a single supply device
with the control and power input pins shorted together the
internal diode between the output and the power input pin will
protect the control input pin.
Thermal Considerations
The MIK1117 series have internal power and
thermal limiting circuitry designed to protect the device under
overload conditions. However maximum junction temperature
ratings should not be exceeded under continuous normal load
conditions. Careful consideration must be given to all sources
of thermal resistance from junction to ambient, including
junction-to-case, case-to-heat sink interface and heat sink
resistance itself.
Junction temperature of the Control section can run
up to 125
0
C. Junction temperature of the Power section can
run up to 150
0
C.
Pad Location MIK1117-XX
Chip size 2.0 mm x 1.78 mm
Pad Location Coordinates
Coordinates
(
m)
N
Pad Name
Pad size
(
m m)
X Y
1 Output
140
140
100 1540
2 Output
140
140
1760 1540
3 V
POWER
(Note1)
140
140
930 1325
4 V
CONTROL
(Note1)
140
140
930 1095
5
Sense (Note 1)
140
140
100 605
6 Adjust (adjustable
output)
GND (fixed output)
140
140
100 100
Note 1: For 3-lead version connect 3, 4 pad to V
IN
and 5 pad to
Output.
Page 5 of 5
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