MIC5219
Micrel
MIC5219
500mA-Peak Output LDO Regulator
General Description
The MIC5219 is an efficient linear voltage regulator with high
peak output current capability, very low dropout voltage, and
better than 1% output voltage accuracy. Dropout is typically
10mV at light loads and less than 500mV at full load.
The MIC5219 is designed to provide a peak output current for
startup conditions where higher inrush current is demanded.
It features a 500mA peak output rating. Continuous output
current is limited only by package and layout.
The MIC5219 can be enabled or shut down by a CMOS or
TTL compatible signal. When disabled, power consumption
drops nearly to zero. Dropout ground current is minimized to
help prolong battery life. Other key features include reversed-
battery protection, current limiting, overtemperature shut-
down, and low noise performance with an ultra-low-noise
option.
The MIC5219 is available in adjustable or fixed output volt-
ages in space-saving SOT-23-5 and MM8™ 8-lead power
MSOP packages. For higher power requirements see the
MIC5209 or MIC5237.
Features
• Guaranteed 500mA-peak output over the full operating
temperature range
• Low 500mV maximum dropout voltage at full load
• Extremely tight load and line regulation
• Tiny SOT-23-5 and MM8™ power MSOP-8 package
• Ultra-low-noise output
• Low temperature coefficient
• Current and thermal limiting
• Reversed-battery protection
• CMOS/TTL-compatible enable/shutdown control
• Near-zero shutdown current
Applications
•
•
•
•
•
•
Laptop, notebook, and palmtop computers
Cellular telephones and battery-powered equipment
Consumer and personal electronics
PC Card V
CC
and V
PP
regulation and switching
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
Typical Applications
MIC5219-5.0BMM
ENABLE
SHUTDOWN
1
2
3
4
8
7
6
5
MIC5219-3.3BM5
V
IN
4V
ENABLE
SHUTDOWN
1
2
3
4
5
V
IN
6V
V
OUT
5V
2.2µF
tantalum
V
OUT
3.3V
2.2µF
tantalum
470pF
470pF
5V Ultra-Low-Noise Regulator
3.3V Ultra-Low-Noise Regulator
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
July 2000
1
MIC5219
MIC5219
Micrel
Ordering Information
Part Number
MIC5219-3.0BMM
MIC5219-3.3BMM
MIC5219-3.6BMM
MIC5219-5.0BMM
MIC5219BMM
MIC5219-2.6BM5
MIC5219-2.7BM5
MIC5219-2.8BM5
MIC5219-2.9BM5
MIC5219-3.0BM5
MIC5219-3.3BM5
MIC5219-3.6BM5
MIC5219-5.0BM5
MIC5219BM5
Marking
—
—
—
—
—
LG26
LG27
LG28
LG29
LG30
LG33
LG36
LG50
LGAA
Volts
3.0V
3.3V
3.6V
5.0V
Adj.
2.6V
2.7V
2.8V
2.9V
3.0V
3.3V
3.6V
5.0V
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
–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
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Other voltages available. Consult Micrel for details.
Pin Configuration
EN 1
IN 2
OUT 3
BYP 4
8
7
6
5
GND
GND
GND
GND
4
EN GND IN
3
2
1
LGxx
5
BYP
OUT
MIC5219-x.xBMM
MM8™ MSOP-8
Fixed Voltages
MIC5219-x.xBM5
SOT-23-5
Fixed Voltages
EN 1
IN 2
OUT 3
ADJ 4
8
7
6
5
GND
GND
GND
GND
EN GND IN
3
2
1
LGAA
4
5
Part
Identification
ADJ
OUT
MIC5219BMM
MM8™ MSOP-8
Adjustable Voltage
MIC5219BM5
SOT-23-5
Adjustable Voltage
Pin Description
Pin No.
MSOP-8
2
5–8
3
1
4 (fixed)
4 (adj.)
Pin No.
SOT-23-5
1
2
5
3
4 (fixed)
4 (adj.)
Pin Name
IN
GND
OUT
EN
BYP
ADJ
Pin Function
Supply Input
Ground: MSOP-8 pins 5 through 8 are internally connected.
Regulator Output
Enable (Input): CMOS compatible control input. Logic high = enable; logic
low or open = shutdown.
Reference Bypass: Connect external 470pF capacitor to GND to reduce
output noise. May be left open.
Adjust (Input): Feedback input. Connect to resistive voltage-divider network.
MIC5219
2
July 2000
MIC5219
Micrel
Absolute Maximum Ratings
Supply Input Voltage (V
IN
) ............................ –20V to +20V
Power Dissipation (P
D
) ............................ Internally Limited
Junction Temperature (T
J
) ....................... –40°C to +125°C
Lead Temperature (Soldering, 5 sec.) ...................... 260°C
Operating Ratings
Supply Input Voltage (V
IN
) ........................... +2.5V to +12V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) ....................... –40°C to +125°C
Package Thermal Resistance ......................... see Table 1
Electrical Characteristics
V
IN
= V
OUT
+ 1.0V; C
OUT
= 4.7µF, I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted.
Symbol
V
OUT
∆V
OUT
/∆T
∆V
OUT
/V
OUT
∆V
OUT
/V
OUT
V
IN
– V
OUT
Parameter
Output Voltage Accuracy
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation
Dropout Voltage,
Note 4
Conditions
variation from nominal V
OUT
Note 2
V
IN
= V
OUT
+ 1V to 12V
I
OUT
= 100µA to 500mA
Note 3
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 150mA
I
OUT
= 500mA
I
GND
Ground Pin Current,
Notes 5, 6
V
EN
≥
3.0V, I
OUT
= 100µA
V
EN
≥
3.0V, I
OUT
= 50mA
V
EN
≥
3.0V, I
OUT
= 150mA
V
EN
≥
3.0V, I
OUT
= 500mA
Ground Pin Quiescent Current,
Note 6
PSRR
I
LIMIT
∆V
OUT
/∆P
D
e
no
Ripple Rejection
Current Limit
Thermal Regulation
Output Noise
V
EN
≤
0.4V
V
EN
≤
0.18V
f = 120Hz
V
OUT
= 0V
Note 7
I
OUT
= 50mA, C
OUT
= 2.2µF, C
BYP
= 0
I
OUT
= 50mA, C
OUT
= 2.2µF, C
BYP
= 470pF
ENABLE Input
V
ENL
Enable Input Logic-Low Voltage
V
EN
= logic low (regulator shutdown)
V
EN
= logic high (regulator enabled)
I
ENL
I
ENH
Enable Input Current
V
ENL
≤
0.4V
V
ENL
≤
0.18V
V
ENH
≥
2.0V
2
2.0
0.01
0.01
5
–1
–2
20
25
0.4
0.18
V
V
µA
µA
µA
Min
–1
–2
40
0.009
0.05
10
115
175
350
80
350
1.8
12
0.05
0.10
75
700
0.05
500
300
1000
0.05
0.1
0.5
0.7
60
80
175
250
300
400
500
600
130
170
650
900
2.5
3.0
20
25
3
8
Typical
Max
1
2
Units
%
%
ppm/°C
%/V
%
mV
mV
mV
mV
µA
µA
mA
mA
µA
µA
dB
mA
%/W
nV/ Hz
nV/ Hz
July 2000
3
MIC5219
MIC5219
Note 1:
Micrel
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when
operating the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction
temperature, T
J(max)
, the junction-to-ambient thermal resistance,
θ
JA
, and the ambient temperature, T
A
. The maximum allowable power
dissipation at any ambient temperature is calculated using: P
D(max)
= (T
J(max)
– T
A
)
÷ θ
JA
. Exceeding the maximum allowable power dissipa-
tion will result in excessive die temperature, and the regulator will go into thermal shutdown. See Table 1 and the “Thermal Considerations”
section for details.
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
range from 100µA to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
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.
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.
V
EN
is the voltage externally applied to devices with the EN (enable) input pin.
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 500mA load pulse at V
IN
= 12V for t = 10ms.
C
BYP
is an optional, external bypass capacitor connected to devices with a BYP (bypass) or ADJ (adjust) pin.
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
MIC5219
4
July 2000
MIC5219
Micrel
Typical Characteristics
Power Supply
Rejection Ratio
0
-20
PSRR (dB)
-40
-60
-80
I
OUT
= 100µA
C
OUT
= 1µF
V
IN
= 6V
V
OUT
= 5V
PSRR (dB)
0
-20
-40
-60
-80
I
OUT
= 1mA
C
OUT
= 1µF
Power Supply
Rejection Ratio
V
IN
= 6V
V
OUT
= 5V
PSRR (dB)
0
-20
-40
-60
-80
Power Supply
Rejection Ratio
V
IN
= 6V
V
OUT
= 5V
I
OUT
= 100mA
C
OUT
= 1µF
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
Power Supply
Rejection Ratio
0
-20
PSRR (dB)
-40
-60
-80
I
OUT
= 100µA
C
OUT
= 2.2µF
C
BYP
= 0.01µF
V
IN
= 6V
V
OUT
= 5V
PSRR (dB)
0
-20
-40
-60
-80
Power Supply
Rejection Ratio
0
V
IN
= 6V
V
OUT
= 5V
PSRR (dB)
-20
-40
-60
-80
Power Supply
Rejection Ratio
V
IN
= 6V
V
OUT
= 5V
I
OUT
= 1mA
C
OUT
= 2.2µF
C
BYP
= 0.01µF
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
-100
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
I
OUT
= 100mA
C
OUT
= 2.2µF
C
BYP
= 0.01µF
60
RIPPLE REJECTION (dB)
50
40
30
20
10
0
Power Supply Ripple Rejection
vs. Voltage Drop
RIPPLE REJECTION (dB)
Power Supply Ripple Rejection
vs. Voltage Drop
100
90
80
70
60
50
40
30
20
10
0
I
OUT
= 100mA
10mA
C
OUT
= 2.2µF
C
BYP
= 0.01µF
0
0.1
0.2
0.3
VOLTAGE DROP (V)
0.4
1mA
NOISE (µV/√Hz)
10
Noise Performance
10mA, C
OUT
= 1µF
1
0.1
0.01
0.001
V
OUT
= 5V
0.0001
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
1mA
10mA
I
OUT
= 100mA
C
OUT
= 1µF
0
0.1
0.2
0.3
VOLTAGE DROP (V)
0.4
Noise Performance
10
1
NOISE (µV/√Hz)
0.1
0.01
0.001
V
OUT
= 5V
C
OUT
= 10µF
electrolytic
1mA
100mA
NOISE (µV/√Hz)
10mA
10
1
0.1
Noise Performance
DROPOUT VOLTAGE (mV)
Dropout Voltage
vs. Output Current
400
100mA
300
200
0.0001
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
1mA
V
OUT
= 5V
C
OUT
= 10µF
0.001
electrolytic
10mA
C
BYP
= 100pF
0.0001
1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
0.01
100
0
0
100 200 300 400 500
OUTPUT CURRENT (mA)
July 2000
5
MIC5219
PCB设计
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