MIC3490
High Input Voltage, Low I
Q
µCap LDO Regulator
Features
•
•
•
•
•
•
•
•
•
•
•
•
Wide Input Voltage Range: 2.3V to 36V
Ultra-Low Ground Current: 18 µA
Low Dropout Voltage of 270 mV at 100 mA
High Output Accuracy of ±2.0% Overtemperature
µCap: Stable with Ceramic or Tantalum
Capacitors
Excellent Line and Load Regulation Specifications
Near Zero Shutdown Current: Typical 0.1 µA
Reverse Battery Protection
Reverse Leakage Protection
Thermal Shutdown and Current-Limit Protection
SOT23-5 Package
The MIC3490 is Pin-to-Pin Compatible with
LM3940
General Description
The MIC3490 is a 100 mA, highly accurate,
low-dropout regulator with high input voltage and
ultra-low ground current. This combination of high
voltage and low ground current makes the MIC3490
ideal for multi-cell Li-Ion battery systems.
As a µCap LDO design, the MIC3490 is stable with
either ceramic or tantalum output capacitors. It only
requires a 2.2 µF output capacitor for stability.
Features of the MIC3490 include enable input, thermal
shutdown, current limit, reverse battery protection and
reverse leakage protection.
Available in five output voltage options (1.8V, 2.5V,
3.0V, 3.3V and 5.0V), the MIC3490 is offered in a 5-pin
SOT23 package with a junction temperature range of
-40°C to + 125°C.
Applications
• Keep-Alive Supply in Notebook and Portable
Computers
• USB Power Supply
• Logic Supply for High-Voltage Batteries
• Automotive Electronics
• Battery-Powered Systems
• 3 to 4-Cell Li-Ion Battery Input Range
Typical Application Circuit
Ultra-Low Current Adjustable Regulator
Application
MIC3490YM5
V
IN
NC
1
2
OFF ON
C
IN
= 1.0 µF
3
EN
4
C
OUT
= 2.2 µF
CERAMIC
I
GND
= 18 µA
5
V
OUT
2019 Microchip Technology Inc.
DS20006137A-page 1
MIC3490
Package Types
MIC3490
5-Pin SOT23
(Top View)
EN
3
GND
2
L3XX
4
IN
5
OUT
NC
1
Functional Block Diagrams
IN
EN
ENABLE
R1
V
REF
OUT
R2
GND
DS20006137A-page 2
2019 Microchip Technology Inc.
MIC3490
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Input Supply Voltage (V
IN
) ........................................................................................................................... -20V to +38V
Enable Input Voltage (V
EN
) ......................................................................................................................... -0.3V to +38V
Power Dissipation (P
DIS
)........................................................................................................................ Internally Limited
ESD Rating
(Note
1)
.................................................................................................................................. ESD Sensitive
Operating Ratings ‡
Input Supply Voltage (V
IN
) ......................................................................................................................... +2.3V to +36V
Enable Input Voltage (V
EN
) ............................................................................................................................. 0V to +36V
† Notice:
Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability. Specifications are for packaged product only.
‡ Notice:
The device is not ensured to function outside its operating ratings.
Note 1:
Devices are ESD sensitive. Handling precautions are recommended.
TABLE 1-1:
ELECTRICAL CHARACTERISTICS
Electrical Characteristics:
T
J
= +25°C with V
IN
= V
OUT
+ 1V; I
OUT
= 100 µA;
Bold
values indicate -40°C
≤
T
J
≤
+125°C; unless otherwise specified. Specifications for packaged product only.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Symbol
V
OUT
ΔV
OUT
/ΔV
IN
ΔV
OUT
/V
OUT
Min.
-1.0
-2.0
—
—
—
—
Dropout Voltage
V
DO
—
—
—
Ground Current
I
GND
—
—
—
—
Ground Current in Shutdown
Short-Circuit Current
Output Leakage, Reverse
Polarity Input
(Note
2)
Enable Input
Input Low Voltage
Input High Voltage
Enable Input Current
Start-up Time
V
EN
—
2.0
-1.0
I
EN
t
START
—
—
—
—
—
0.01
0.1
0.5
1.7
0.6
—
1.0
1.0
2.5
7
ms
µA
V
Regulator off
Regulator on
V
EN
= 0.6V; Regulator off
V
EN
= 2.0V; Regulator on
V
EN
= 36V; Regulator on
V
IN
applied before EN signal
I
SHDN
I
SC
V
OUT
—
—
—
Typ.
—
—
0.04
0.25
50
230
—
270
—
18
—
0.25
1
0.1
190
-0.1
Max.
1.0
2.0
0.5
1
—
300
400
400
450
30
35
0.70
2
1
350
—
µA
mA
µA
mA
V
I
OUT
= 100 µA
I
OUT
= 50 mA
I
OUT
= 100 mA
V
EN
≤
0.6V; V
IN
= 36V
V
OUT
= 0V
Load = 500Ω; V
IN
= -15V
mV
I
OUT
= 100 mA
Units
%
%
%
Conditions
Variation from nominal V
OUT
V
IN
= V
OUT
+ 1V to 36V
I
OUT
= 100 µA to 100 mA
I
OUT
= 100 µA
I
OUT
= 50 mA
2019 Microchip Technology Inc.
DS20006137A-page 3
MIC3490
TEMPERATURE SPECIFICATIONS
(1)
Parameters
Temperature Ranges
Junction Operating Temperature Range
Storage Temperature Range
Package Thermal Resistances
Thermal Resistance 5-Pin SOT23
Note 1:
JA
—
235
—
°C/W
—
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., T
A
, T
J
,
JA
). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.
Design guidance only, not production tested.
T
J
T
S
-40
-65
—
—
+125
+150
°C
°C
—
—
Sym.
Min.
Typ.
Max.
Units
Conditions
2:
DS20006137A-page 4
2019 Microchip Technology Inc.
MIC3490
2.0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
FIGURE 2-1:
Ratio.
Power Supply Rejection
FIGURE 2-4:
Dropout Characteristics.
FIGURE 2-2:
Current.
Dropout Voltage vs. Output
FIGURE 2-5:
Output Current.
Ground Pin Current vs.
FIGURE 2-3:
Temperature.
Dropout Voltage vs.
FIGURE 2-6:
Output Current.
Ground Pin Current vs.
2019 Microchip Technology Inc.
DS20006137A-page 5
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