MIC5205
150mA Low-Noise LDO Regulator
General Description
The MIC5205 is an efficient linear voltage regulator with
ultra low-noise output, very low dropout voltage (typically
17mV at light loads and 165mV at 150mA), and very low
ground current (600⎧A at 100mA output). The MIC5205
offers better than 1% initial accuracy.
Designed especially for hand-held, battery-powered
devices, the MIC5205 includes a CMOS or TTL compatible
enable/shutdown control input. When shut down, power
consumption drops nearly to zero. Regulator ground
current increases only slightly in dropout, further
prolonging battery life.
Key MIC5205 features include a reference bypass pin to
improve its already excellent low-noise performance,
reversed-battery protection, current limiting, and
overtemperature shutdown.
The MIC5205 is available in fixed and adjustable output
voltage versions in a small SOT-23-5 package.
For low-dropout regulators that are stable with ceramic
output capacitors, see the
µ
Cap MIC5245/6/7 family.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
Ultra-low-noise output
High output voltage accuracy
Guaranteed 150mA output
Low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Reverse-battery protection
“Zero” off-mode current
Logic-controlled electronic enable
Applications
•
•
•
•
•
•
•
Cellular telephones
Laptop, notebook, and palmtop computers
Battery-powered equipment
PCMCIA V
CC
and V
PP
regulation/switching
Consumer/personal electronics
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
___________________________________________________________________________________________________________
Typical Application
Ultra-Low-Noise Regulator Application
Xxxxx is a trademark of Micrel, Inc
Xxxxx is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2006
M9999-020806
(408) 955-1690
Micrel
MIC5205
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
).............................. –20V to +20V
Enable Input Voltage (V
EN
)............................. –20V to +20V
Power Dissipation (P
D
) .................Internally Limited,
Note 3
Lead Temperature (soldering, 5 sec.)........................ 260°C
Junction Temperature (T
J
) ........................–40°C to +125°C
Storage Temperature (T
S
).........................–65°C to +150°C
Operating Ratings
(2)
Input Voltage (V
IN
)......................................... +2.5V to +16V
Enable Input Voltage (V
EN
).....................................0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Thermal Resistance, SOT-23-5 (θ
JA
) ........................
Note 3
Electrical Characteristics
(4)
V
IN
= V
OUT
+ 1V; I
L
= 100µA; C
L
= 1.0µF; V
EN
≥
2.0V; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted.
Symbol
V
O
∆V
O
/∆T
∆V
O
/V
O
∆V
O
/V
O
V
IN
– V
O
Parameter
Output Voltage Accuracy
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Dropout Voltage, Note 6
Condition
variations from specified V
OUT
Note 4
V
IN
= V
OUT
+ 1V to 16V
I
L
= 0.1mA to 150mA, Note 5
I
L
= 100µA
I
L
= 50mA
I
L
= 100mA
I
L
= 150mA
I
GND
I
GND
Quiescent Current
Ground Pin Current, Note 7
V
EN
≤
0.4V (shutdown)
V
EN
≤
0.18V (shutdown)
V
EN
≥
2.0V, I
L
= 100µA
I
L
= 50mA
I
L
= 100mA
I
L
= 150mA
PSRR
I
LIMIT
∆V
O
/∆P
D
e
NO
Ripple Rejection
Current Limit
Thermal Regulation
Output Noise
Frequency = 100Hz, I
L
= 100µA
V
OUT
= 0V
Note 8
I
L
= 50mA, C
L
= 2.2µF, 470pF from BYP to
GND
Min
–1
–2
40
0.004
0.02
10
110
140
165
0.01
80
350
600
1300
75
320
0.05
260
500
0.012
0.05
0.2
0.5
50
70
150
230
250
300
275
350
1
5
125
150
600
800
1000
1500
1900
2500
Typ
Max
1
2
Units
%
%
ppm/°C
%/V
%/V
%
%
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
dB
mA
%/W
nV/ Hz
ENABLE Input
V
IL
V
IH
I
IL
I
IH
Enable Input Logic-Low Voltage
Enable Input Logic-High
Voltage
Enable Input Current
regulator shutdown
regulator enabled
V
IL
≤
0.4V
V
IL
≤
0.18V
V
IL
= 2.0V
V
IL
= 2.0V
2.0
0.01
2
5
–1
–2
20
25
0.4
0.18
V
V
V
µA
µA
µA
µA
February 2006
3
M9999-020806
(408) 955-1690
Micrel
Notes:
1.
Exceeding the absolute maximum rating may damage the device.
2.
The device is not guaranteed to function outside its operating rating.
MIC5205
3.
The maximum allowable power dissipation at any T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
)
⎟ ⎝
JA
. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The
⎝
JA
of the MIC5205-xxBM5 (all
versions) is 220°C/W mounted on a PC board (see “Thermal Considerations” section for further details).
4.
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
5.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range
from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
6.
Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential.
7.
Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load
current plus the ground pin current.
8,
Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 150mA load pulse at V
IN
= 16V for t = 10ms.
February 2006
4
M9999-020806
(408) 955-1690
嵌入式系统
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