MIC3775
750 mA µCap Low Voltage, Low Dropout Regulator
Features
• Fixed and Adjustable Output Voltages to 1.24V
• 280 mV Typical Dropout at 750 mA
- Ideal for 3.0V to 2.5V Conversion
- Ideal for 2.5V to 1.8V or 1.65V Conversion
• Stable with Ceramic Capacitor
• 750 mA Minimum Guaranteed Output Current
• 1% Initial Accuracy
• Low Ground Current
• Current Limiting and Thermal Shutdown
• Reversed-Leakage Protection
• Fast Transient Response
• Low Profile Power MSOP-8 Package
General Description
The MIC3775 is a 750 mA low dropout linear voltage
regulators that provides low voltage, high current
output from an extremely small package. Utilizing
Microchip’s proprietary Superβeta PNP pass element,
the MIC3775 offers extremely low dropout (typically
280 mV at 750 mA) and low ground current (typically
7.5 mA at 750 mA).
The MIC3775 is ideal for PC add-in cards that need to
convert from standard 5V to 3.3V or 3.0V, 3.3V to 2.5V,
or 2.5V to 1.8V or 1.65V. A guaranteed maximum
dropout voltage of 500 mV over all operating conditions
allows the MIC3775 to provide 2.5V from a supply as
low as 3.0V and 1.8V or 1.5V from a supply as low as
2.25V.
The MIC3775 is fully protected with overcurrent
limiting, thermal shutdown, and reversed-leakage
protection. Fixed and adjustable output voltage options
are available with an operating temperature range of
–40°C to +125°C.
Applications
•
•
•
•
•
•
•
•
Fiber Optic Modules
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
Package Types
MIC3775 (F
IXED
)
MSOP-8 (MM)
(Top View)
MIC3775 (A
DJ
)
MSOP-8 (MM)
(Top View)
EN 1
IN 2
FLG 3
OUT 4
8 GND
7 GND
6 GND
5 GND
EN 1
IN 2
ADJ 3
OUT 4
8 GND
7 GND
6 GND
5 GND
2018 Microchip Technology Inc.
DS20006045A-page 1
MIC3775
Typical Application Circuit
1.25V/750
M
A A
DJUSTABLE
R
EGULATOR
MIC3775
V
IN
2.5V
ENABLE
SHUTDOWN
IN
EN
OUT
R1
ADJ
GND
R2
1.25V
10μF
ceramic
Functional Block Diagrams
MIC3775 F
IXED
R
EGULATOR WITH
F
LAG AND
E
NABLE
IN
OUT
1.180V
FLAG
Ref.
1.240V
EN
Thermal
Shut-
down
GND
MIC3775 A
DJUSTABLE
R
EGULATOR
OUT
IN
Ref.
1.240V
ADJ
EN
Thermal
Shut-
down
GND
DS20006045A-page 2
2018 Microchip Technology Inc.
MIC3775
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (V
IN
) ................................................................................................................................................+6.5V
Enable Voltage (V
EN
) ...............................................................................................................................................+6.5V
Lead Temperature (Soldering, 5 sec.)................................................................................................................... +260°C
Storage Temperature (T
S
)...................................................................................................................... –65°C to +150°C
ESD Rating .............................................................................................................................................................Note
1
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
Junction Temperature (T
J
)...................................................................................................................... –40°C to +125°C
Package Thermal Resistance (MSOP-8,
θ
JA
).......................................................................................................80°C/W
† 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.
†† 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 “Applications Infor-
mation.”
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 noted.
Note 1
Parameter
Output Voltage
Sym.
V
OUT
∆V
OUT
/
V
OUT
∆V
OUT
/
V
OUT
∆V
OUT
/
∆T
Min.
–1
–2
—
—
—
—
Dropout Voltage (Note
3)
V
DO
—
—
—
Note 1:
2:
3:
Typ.
—
—
0.06
0.2
40
125
—
210
280
Max.
1
2
0.5
1
—
200
250
—
500
mV
%
Units
10 mA
10 mA
≤
I
OUT
≤
750 mA,
V
OUT
+ 1V
≤
V
IN
≤
6V
I
OUT
= 10 mA, V
OUT
+ 1V
≤
V
IN
≤
6V
V
IN
= V
OUT
+ 1V,
10 mA
≤
I
OUT
≤
750 mA
Conditions
Line Regulation
Load Regulation
Output Voltage Temp.
Coefficient
%
%
ppm/°C
Note 2
I
OUT
= 100 mA
I
OUT
= 500 mA
I
OUT
= 750 mA
4:
Specification for packaged product only.
Output voltage temperature coefficient is
∆V
OUT(WORSTCASE)
÷ (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 1.75V, 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.
DS20006045A-page 3
MIC3775
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 noted.
Note 1
Parameter
Sym.
Min.
—
Ground Current (Note
4)
Current Limit
Enable Input
Enable Input Voltage
V
EN
—
2.25
1
Enable Input Current
I
EN
—
—
Flag Output
Output Leakage Current
Output Low Voltage
Low Threshold
High Threshold
Hysteresis
Adjustable Output Only
Reference Voltage
Adjust Pin Bias Current
Note 1:
2:
3:
V
REF
—
1.227
1.215
—
—
1.240
—
40
—
1.252
1.265
80
120
V
nA
—
—
V
FLG
I
FLG(LEAK)
Typ.
700
3.7
7.5
1.6
—
—
10
—
—
0.01
—
250
—
—
1
Max.
—
—
15
2.5
Units
µA
mA
A
Conditions
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
V
OUT
= 0V, V
IN
= V
OUT
+ 1V
Logic low (off)
Logic high (on)
V
EN
= 2.25V
I
GND
I
OUT(LIM)
—
—
—
0.8
—
30
2
4
1
2
500
—
99.2
—
V
µA
V
EN
= 0.8V
—
—
—
93
—
—
µA
mV
%
V
OH
= 6V
V
IN
= 2.250V, I
OL
= 250 µA
% of V
OUT
% of V
OUT
—
V
FLG(DO)
4:
Specification for packaged product only.
Output voltage temperature coefficient is
∆V
OUT(WORSTCASE)
÷ (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 1.75V, 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
.
DS20006045A-page 4
2018 Microchip Technology Inc.
MIC3775
TEMPERATURE SPECIFICATIONS
Parameters
Temperature Ranges
Maximum Junction Temperature Range
Storage Temperature Range
Lead Temperature
Package Thermal Resistances
Thermal Resistance, MSOP 8-Ld
Note 1:
JA
—
80
—
°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.
T
J
T
S
—
–40
–65
—
—
—
—
+125
+150
+260
°C
°C
°C
—
—
Soldering, 5 sec.
Sym.
Min.
Typ.
Max.
Units
Conditions
2018 Microchip Technology Inc.
DS20006045A-page 5
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