MIC3775
Micrel
MIC3775
750mA
µ
Cap Low-Voltage Low-Dropout Regulator
Final
General Description
The MIC3775 is a 750mA low-dropout linear voltage regula-
tors that provides low-voltage, high-current output from an
extremely small package. Utilizing Micrel’s proprietary
Superβeta PNP™ pass element, the MIC3775 offers ex-
tremely low-dropout (typically 280mV at 750mA) and low
ground current (typically 7.5mA at 750mA).
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 500mV
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.
Features
• Fixed and adjustable output voltages to 1.24V
• 280mV typical dropout at 750mA
Ideal for 3.0V to 2.5V conversion
Ideal for 2.5V to 1.8V or 1.65V conversion
• Stable with ceramic capacitor
• 750mA 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
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
For other voltages, contact Micrel.
Ordering Information
Part Number
MIC3775-1.5BMM
MIC3775-1.65BMM
MIC3775-1.8BMM
MIC3775-2.5BMM
MIC3775-3.0BMM
MIC3775-3.3BMM
MIC3775BMM
Voltage
1.5V
1.65V
1.8V
2.5V
3.0V
3.3V
Adj.
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
MSOP-8
MSOP-8
MSOP-8
MSOP-8
MSOP-8
MSOP-8
MSOP-8
Typical Applications
300
Dropout
vs. Output Current
250
1.25V
R1
10µF
ceramic
DROPOUT (mV)
V
IN
2.5V
ENABLE
SHUTDOWN
MIC3775BMM
IN
OUT
EN
ADJ
GND
1.8V
OUT
200
150
100
50
0
0
0.25
0.5
0.75
OUTPUT CURRENT (A)
2.5V
OUT
3.3V
OUT
R2
1.25V/750mA Adjustable Regulator
Superβeta PNP is a trademark of Micrel, Inc.
PowerPC is a trademark of Motorola
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
March 2003
1
MIC3775
MIC3775
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
IN
) .................................................... 6.5V
Enable Voltage (V
EN
) ................................................. +6.5V
Storage Temperature (T
S
) ....................... –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD .........................................................................
Note 3
Operating Ratings
(Note 2)
Supply Voltage (V
IN
) .................................... +2.25V to +6V
Enable Voltage (V
EN
) ......................................... 0V to +6V
Maximum Power Dissipation (P
D(max)
).....................
Note 4
Junction Temperature (T
J
) ....................... –40°C to +125°C
Package Thermal Resistance
MSOP-8
(θ
JA
) ...................................................... 80°C/W
Electrical Characteristics
(Note 5)
V
IN
= V
OUT
+ 1V; V
EN
= 2.25V; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted
Symbol
V
OUT
Parameter
Output Voltage
Line Regulation
Load Regulation
∆V
OUT
/∆T
V
DO
Output Voltage Temp. Coefficient,
Note 6
Dropout Voltage,
Note 7
I
OUT
= 100mA,
∆V
OUT
= –1%
I
OUT
= 500mA,
∆V
OUT
= –1%
I
OUT
= 750mA,
∆V
OUT
= –1%
I
GND
Ground Current,
Note 8
I
OUT
= 100mA, V
IN
= V
OUT
+ 1V
I
OUT
= 500mA, V
IN
= V
OUT
+ 1V
I
OUT
= 750mA, V
IN
= V
OUT
+ 1V
I
OUT(lim)
Enable Input
V
EN
I
EN
Enable Input Voltage
logic low (off)
logic high (on)
Enable Input Current
V
EN
= 2.25V
V
EN
= 0.8V
Flag Output
I
FLG(leak)
V
FLG(do)
V
FLG
Output Leakage Current
Output Low Voltage
Low Threshold
High Threshold
Hysteresis
Adjustable Output Only
Reference Voltage
Adjust Pin Bias Current
Note 1.
Note 2.
Note 3.
Note 4.
Exceeding the absolute maximum ratings may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
P
D(max)
= (T
J(max)
– T
A
)
÷ θ
JA
, where
θ
JA
depends upon the printed circuit layout. See “Applications Information.”
Condition
10mA
10mA
≤
I
OUT
≤
750mA, V
OUT
+ 1V
≤
V
IN
≤
6V
I
OUT
= 10mA, V
OUT
+ 1V
≤
V
IN
≤
6V
V
IN
= V
OUT
+ 1V, 10mA
≤
I
OUT
≤
750mA,
Min
–1
–2
Typ
Max
1
2
Units
%
%
%
%
ppm/°C
0.06
0.2
40
125
210
280
700
3.7
7.5
1.6
0.5
1
200
250
mV
mV
mV
500
mV
µA
mA
15
2.5
mA
A
Current Limit
V
OUT
= 0V, V
IN
= V
OUT
+ 1V
0.8
2.25
1
10
30
2
4
V
V
µA
µA
µA
µA
µA
mV
%
V
OH
= 6V
V
IN
= 2.250V, I
OL
, = 250µA
% of V
OUT
% of V
OUT
93
0.01
250
1
2
500
99.2
1
%
%
1.227
1.215
1.240
40
1.252
1.265
80
120
V
V
nA
nA
March 2003
3
MIC3775
MIC3775
Note 5.
Note 6.
Note 7.
Note 8.
Specification for packaged product only.
Output voltage temperature coefficient is
∆V
OUT(worst case)
÷
(T
J(max)
– T
J(min)
) where T
J(max)
is +125°C and T
J(min)
is –40°C.
Micrel
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
.
MIC3775
4
March 2003
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