MIC37100/01/02
1A Low-Voltage µCap LDO Regulator
Features
• Fixed and Adjustable Output Voltages to 1.24V
• µCap Regulator, 10 µF Ceramic Output Capacitor
Stable
• 280 mV Typical Dropout at 1A
- Ideal for 3.0V to 2.5V Conversion
- Ideal for 2.5V to 1.8V, 1.65V or 1.5V
Conversion
• 1A Minimum Guaranteed Output Current
• 1% Initial Accuracy
• Low Ground Current
• Current Limiting and Thermal Shutdown
• Reversed Leakage Protection
• Fast Transient Response
• Low Profile SOT-223 Package
• Power SO-8 Package
• S-PAK Package (MIC37102 Only)
General Description
The MIC37100, MIC37101, and MIC37102 are 1A low
dropout, linear voltage regulators that provide low
voltage, high current output from an extremely small
package. Utilizing Microchip’s proprietary Super βeta
PNP pass element, the MIC37100/01/02 offers
extremely low dropout (typically 280 mV at 1A) and low
ground current (typically 11 mA at 1A).
The MIC37100 is a fixed output regulator offered in the
SOT-223 package. The MIC37101 and MIC37102 are
fixed and adjustable regulators, respectively, in a
thermally enhanced power 8-pin SOIC (small outline
package). The MIC37102 is also available in the S-PAK
power package, for applications that require higher
power dissipation or higher operating ambient
temperatures.
The MIC37100/01/02 is ideal for PC add in cards that
need to convert from standard 5V to 3.3V, 3.3V to 2.5V
or 2.5V to 1.8V or lower. A guaranteed maximum
dropout voltage of 500 mV over all operating conditions
allows the MIC37100/01/02 to provide 2.5V from a
supply as low as 3V and 1.8V from a supply as low as
2.3V.
The MIC37100/01/02 is fully protected with overcurrent
limiting and thermal shutdown. Fixed output voltages of
1.5V, 1.65V, 1.8V, 2.5V and 3.3V are available on
MIC37100/01 with adjustable output voltages to 1.24V
on MIC37102.
Applications
•
•
•
•
•
•
•
LDO Linear Regulator for PC Add In Cards
PowerPC Power Supplies
High Efficiency Linear Power Supplies
SMPS Post Regulator
Multimedia and PC Processor Supplies
Battery Chargers
Low Voltage Microcontrollers and Digital Logic
Typical Application
2.5V/1A Regulator
Dropout vs. Output Current
350
DROPOUT (mV)
V
IN
3.3V
MIC37100
OUT
IN
GND
2.5V
10µF
ceramic
300
250
200
150
100
50
0
0
2.5V
OUT
3.3V
OUT
0.25
0.5
0.75
OUTPUT CURRENT (A)
1
2018 Microchip Technology Inc.
DS20006104A-page 1
MIC37100/01/02
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (V
IN
)....................................................................................................................................... 0V to +6.5V
Enable Voltage (V
EN
) ...............................................................................................................................................+6.5V
Power Dissipation (P
DIS
) ........................................................................................................................Internally Limited
ESD Rating (Note
1)...................................................................................................................................
ESD Sensitive
Operating Ratings ‡
Supply Voltage (V
IN
)................................................................................................................................... +2.25V to +6V
Enable Voltage (V
EN
) ........................................................................................................................................ 0V to +6V
Maximum Power Dissipation (P
D(max)
)................................................................................................................. (Note
2)
† 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 guaranteed to function outside its operating ratings.
Note 1:
Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF.
2:
P
D(max)
= (T
J(max)
– T
A
) ÷ θ
JA
, where θ
JA
depends upon the printed circuit layout. See “Section
4.0 “Appli-
cation Information”
section.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics:
V
IN
= V
OUT
+ 1V; V
EN
= 2.25V; T
J
= 25°C,
Bold
values indicate –40°C ≤ T
J
≤ +125°C;
unless otherwise specified.
Parameter
Output Voltage
Line Regulation
Load Regulation
Output Voltage Temperature
Coefficient (Note
1)
ΔV
OUT
/ΔT
V
OUT
Symbol
Min.
–1
–2
—
—
—
—
Dropout Voltage (Note
2)
V
DO
—
—
—
—
Ground Current (Note
3)
I
GND
—
—
—
Current Limit
I
OUT(lim)
—
—
0.06
0.2
40
125
210
250
280
650
3.5
6.7
11
1.6
Typ.
Max.
1
2
0.5
1
—
200
350
400
500
—
—
—
25
2.5
Units
%
%
%
%
pm/°C
mV
mV
mV
mV
µA
mA
mA
mA
A
I
OUT
= 100 mA, ΔV
OUT
= –2%
I
OUT
= 500 mA, ΔV
OUT
= –2%
I
OUT
= 750 mA, ΔV
OUT
= –2%
I
OUT
= 1A, ΔV
OUT
= –1%
I
OUT
= 100 mA, V
IN
= V
OUT
+ 1V
I
OUT
= 500 mA, V
IN
= V
OUT
+ 1V
I
OUT
= 750 mA, V
IN
= V
OUT
+ 1V
I
OUT
= 1A, V
IN
= V
OUT
+ 1V
V
OUT
= 0V, V
IN
= V
OUT
+ 1V
Conditions
10 mA
10 mA ≤ I
OUT
≤ 1A, V
OUT
+ 1V ≤
V
IN
≤ 6V
I
OUT
= 10 mA, V
OUT
+ 1V ≤ VIN ≤
6V
V
IN
= V
OUT
+ 1V, 10 mA ≤ I
OUT
≤
1A
DS20006104A-page 4
2018 Microchip Technology Inc.
MIC37100/01/02
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics:
V
IN
= V
OUT
+ 1V; V
EN
= 2.25V; T
J
= 25°C,
Bold
values indicate –40°C ≤ T
J
≤ +125°C;
unless otherwise specified.
Parameter
Enable Input
Enable Input Voltage
V
EN
—
2.25
1
Enable Input Current
Flag Output
Output Leakage Current
Output Low Voltage
Low Threshold
High Threshold
Hysteresis
MIC37102 Only
Reference Voltage
Adjust Pin Bias Current
1:
2:
—
—
—
—
1.228
1.215
—
—
1.240
—
40
—
1.252
1.265
80
120
V
V
nA
nA
—
—
V
FLG
I
FLG(leak)
V
FLG(do)
—
—
—
93
—
—
0.01
—
210
—
—
1
1
2
500
—
99.2
—
µA
mV
%
%
%
V
OH
= 6V
V
IN
= 2.25V, I
OL
, = 250 µA
% of V
OUT
% of V
OUT
—
I
EN
—
—
—
—
10
—
—
0.8
—
30
2
4
V
V
µA
µA
µA
Logic low (OFF)
Logic high (ON)
V
EN
= 2.25V
V
EN
= 0.8V
Symbol
Min.
Typ.
Max.
Units
Conditions
3:
Output voltage temperature coefficient is ΔV
OUT
(worst case) ÷ (T
J(max)
– T
J(min)
) where T
J(max)
is +125°C
and T
J(min)
is –40°C.
V
DO
= V
IN
– V
OUT
when V
OUT
decreases to 98% of its nominal output voltage with V
IN
= V
OUT
+ 1V. For
output voltages below 2.25V, dropout voltage is the input-to-output voltage differential with the minimum
input voltage being 2.25V. Minimum input operating voltage is 2.25V.
I
GND
is the quiescent current. I
IN
= I
GND
+ I
OUT
.
2018 Microchip Technology Inc.
DS20006104A-page 5
Embedded System
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