MIC5201-5.0BS [MICREL]
200mA Low-Dropout Voltage Regulator; 200毫安低压差稳压器型号: | MIC5201-5.0BS |
厂家: | MICREL SEMICONDUCTOR |
描述: | 200mA Low-Dropout Voltage Regulator |
文件: | 总12页 (文件大小:134K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MIC5201
200mA Low-Dropout Voltage Regulator
General Description
Features
The MIC5201 is an efficient linear voltage regulator with very
low dropout voltage (typically 17mV at light loads and 200mV
at 100mA), and very low ground current (1mA at 100mA
output), offering better than 1% initial accuracy with a logic
compatible on-off switching input.
• High output voltage accuracy
• Variety of output voltages
• Guaranteed 200mA output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Reversed-battery protection
• Load-dump protection (fixed voltage versions)
• Zero off-mode current
Designed especially for hand-held battery powered devices,
the MIC5201 can be switched by a CMOS or TTL compatible
enable signal. This enable control may be connected directly
to V if unneeded. When disabled, power consumption
IN
drops nearly to zero. The ground current of the MIC5201
increases only slightly in dropout, further prolonging battery
life. Key MIC5201 features include current limiting,
overtemperature shutdown, and protection against reversed
battery.
• Logic-controlled electronic enable
• Available in SO-8 and SOT-223 packages
Applications
The MIC5201 is available in several fixed voltages and
accuracy configurations. It features the same pinout as the
LT1121withbetterperformance. Otheroptionsareavailable;
contact Micrel for details.
• Cellular telephones
• Laptop, notebook, and palmtop computers
• Battery powered equipment
• PCMCIA V and V regulation/switching
CC
PP
• Bar code scanners
• SMPS post-regulator/ dc-to-dc modules
• High-efficiency linear power supplies
Ordering Information
Part Number
Voltage Junction Temp. Range*
Package
SO-8
MIC5201BM
Adj
3.0
3.3
5.0
3.0
3.3
4.85
5.0
–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
MIC5201-3.0BM
MIC5201-3.3BM
MIC5201-5.0BM
MIC5201-3.0BS
MIC5201-3.3BS
MIC5201-4.8BS
MIC5201-5.0BS
SO-8
SO-8
SO-8
SOT-223
SOT-223
SOT-223
SOT-223
Other voltages available. Contact Micrel for details.
* Junction Temperature.
Typical Application
ENABLE
SHUTDOWN
MIC5201-3.3
VOUT
3.3V
IN
OUT
EN
GND
1µF
MM8 is a trademark of Micrel, Inc.
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 1998
1
MIC5201
MIC5201
Micrel
Pin Configuration
GND
TAB
1
2
3
IN
GND OUT
1
2
3
4
8
7
6
5
OUT
NC
IN
1
2
3
4
8
7
6
5
OUT
ADJ
GND
NC
IN
MIC5201-x.xBS
SOT-223
NC
NC
EN
NC
NC
EN
Fixed
GND
NC
MIC5201-x.xBM
8-Lead SOIC
Fixed
MIC5201BM
8-Lead SOIC
Adjustable
Pin Description
Pin No.
Pin No.
Pin No.
Pin Name
Pin Function
SOT-223 SO-8 Adj. SO-8 Fixed
3
1
2
1
OUT
ADJ
NC
Regulated Output
Feedback Input: (Adjustable version only)
4, 6, 7
2, 4, 6, 7
not internally connected: Connect to ground plane for lowest thermal
resistance.
2
1
3
5
3
5
GND
EN
Ground
Enable (Input): TTL compatible input. High = enable.
Low or open = off/disable.
8
8
VIN
Unregulated Supply Input
Absolute Maximum Ratings
Operating Ratings
Supply Input Voltage (V ) Fixed .................. –20V to +60V
Supply Input Voltage (V ) Fixed ................... 2.5V to +26V
IN
IN
Supply Input Voltage (V ) Adjustable .......... –20V to +20V
Supply Input Voltage (V ) Adjustable ........... 2.5V to +16V
IN
IN
Enable Input Voltage (V ) Fixed ................. –20V to +60V
Enable Input Voltage (V ) .................................. 0V to V
EN
EN
IN
Enable Input Voltage (V ) Adjustable ......... –20V to +20V
Junction Temperature (T ) ....................... –40°C to +125°C
EN
J
Power Dissipation (P ) ............................ Internally Limited
D
Junction Temperature (T ) ....................... –40°C to +125°C
J
Lead Temperature (soldering, 5 sec.) ....................... 260°C
MIC5201
2
July 1998
MIC5201
Micrel
Electrical Characteristics
VIN = VOUT + 1V; IL = 100µA; CL = 3.3µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
Condition
Min
Typ
Max
Units
VO
Output Voltage Accuracy
Variation from specified VOUT
–1
–2
1
2
%
%
∆VO/∆T
∆VO/VO
Output Voltage Temperature Coef.
Line Regulation, Fixed
Note 2
40
150 ppm/°C
VIN = VOUT + 1V to 26V
0.004
0.20
%
%
0.40
∆VO/VO
∆VO/VO
VIN – VO
Line Regulation, Adjustable
Load Regulation
VIN = VOUT + 1V to 16V
0.004
0.04
0.20
0.40
%
%
IL = 0.1mA to 200mA, Note 3
0.16
0.30
%
%
Dropout Voltage, Note 4
IL = 100µA
IL = 20mA
IL = 50mA
IL = 100mA
IL = 200mA
17
mV
mV
mV
mV
mV
130
180
225
270
400
IGND
IGND
Quiescent Current
Ground Pin Current
V
ENABLE ≤ 0.7V (shutdown)
0.01
µA
IL = 100µA
IL = 20mA
IL = 50mA
IL = 100mA
IL = 200mA
130
270
500
1000
3000
µA
µA
µA
µA
µA
400
2000
PSRR
Ripple Rejection
75
dB
IGNDDO
Ground Pin Current at Dropout
VIN = 0.5V less than specified VOUT
IL = 100µA, Note 5
,
270
330
µA
ILIMIT
Current Limit
VOUT = 0V
280
0.05
100
500
mA
%/W
µV
∆VO/∆PD
Thermal Regulation
Output Noise
Note 6
en
Enable Input
VIL
VIH
IIL
Input Voltage Level
Input Voltage Level
Enable Input Current
Enable Input Current
logic low (off)
logic high (on)
0.7
V
V
2.0
V
IL ≤ 0.7V
IH ≤ 2.0V
0.01
15
1
µA
µA
IIH
V
50
Reference (MIC5201 Adjustable Version Only)
VREF
Reference Voltage
1.223 1.242 1.255
1.217 1.267
V
V
IIL
Reference Voltage Temp. Coef.
20
ppm/°C
General Note: Devices are ESD sensitive. Handling precautions recommended.
Note 1: 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 rated operating conditions. The maximum allowable power dissipation is a function of the maximum junction
temperature, T
, the junction-to-ambient thermal resistance, θ , and the ambient temperature, T . The maximum allowable power
J(max)
JA
A
dissipation at any ambient temperature is calculated using: P
= (T
– T ) ÷ θ . Exceeding the maximum allowable power dissipation
(max)
J(max)
A
JA
will result in excessive die temperature, and the regulator will go into thermal shutdown. The θ of the MIC5201-x.xBS is 15°C/W and θ for
JC
JA
the MIC5201BM is 160°C/W mounted on a PC board (see “Thermal Considerations” section for further details).
Note 2: Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
Note 3: 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 200mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 4: 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.
Note 5: 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.
Note 6: 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 200mA load pulse at V = 26V for fixed and V = 16V for adjustable at t = 10ms.
IN
IN
July 1998
3
MIC5201
MIC5201
Micrel
Block Diagrams
OUT
IN
VOUT
COUT
VIN
Bandgap
Ref.
Current Limit
Thermal Shutdown
MIC5201-x.xBS
GND
Fixed Regulator (SOT-223 version only)
OUT
IN
VOUT
COUT
VIN
Bandgap
Ref.
EN
Current Limit
Thermal Shutdown
MIC5201-x.xBM
GND
Fixed Regulator
OUT
ADJ
IN
VOUT
COUT
VIN
R1
R2
Bandgap
Ref.
EN
Current Limit
Thermal Shutdown
MIC5201BM [adj.]
GND
Adjustable Regulator
MIC5201
4
July 1998
MIC5201
Micrel
Typical Characteristics
Dropout Voltage
vs. Output Current
Dropout Voltage
vs. Temperature
Dropout
Characteristics
250
0.4
0.3
0.2
0.1
0.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
200
150
100
50
IL = 100mA
IL = 100mA
IL = 100µA, 1mA
IL = 1mA
0
0.01 0.1
1
10
100 1000
-60 -30
0
30 60 90 120 150
0
2
4
6
8
10
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Ground Current
vs. Output Current
Output Voltage
vs. Output Current
Ground Current
vs. Supply Voltage
10
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
CIN = 2.2µF
COUT = 4.7µF
IL = 100mA
1
IL = 1mA
0.1
0.01
0.1
1
10
100
0
2
4
6
8
10
0.0
0.1
0.2
0.3
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
OUTPUT CURRENT (A)
Ground Current
vs. Temperature
Ground Current
vs. Temperature
Thermal Regulation
(3.3V Version)
0.30
0.25
0.20
0.15
1.5
1.4
1.3
1.2
1.1
1.0
100
ILOAD = 100µA
CIN = 2.2µF
COUT = 4.7µF
ILOAD = 100mA
CIN = 2.2µF
COUT = 4.7µF
50
0
CL = 4.7 µF
2-050
100
0
-100
-60 -30
0
30 60 90 120 150
-50
0
50
100
150
-5
0
5
10 15 20 25 30 35
TIME (ms)
TEMPERATURE (°C)
TEMPERATURE (°C)
Output Current
vs. Temperature
Minimum Input Voltage
vs. Temperature
Output Voltage vs. Temp.
(3.3V Version)
3.6
3.5
3.4
3.3
3.2
3.1
3.0
300
3.30
3.29
3.28
3.27
3.26
3.25
3.24
3.23
3.22
3.21
3.20
280
260
240
220
200
180
160
140
120
100
CIN = 2.2µF
COUT = 4.7µF
CIN = 2.2µF
COUT = 4.7µF
ILOAD = 1mA
VOUT = 3.3V
3 DEVICES:
HI / AVG / LO
VOUT = 0V
(SHORT CIRCUIT)
CURVES APPLICABLE
AT 100µA AND 100mA
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
July 1998
5
MIC5201
MIC5201
Micrel
Short Circuit Current
vs. Input Voltage
Load Transient
Load Transient
300
20
10
20
10
250
200
150
100
50
0
0
-10
-20
3-030
-10
-20
3-030
CL = 4.7µF
CL = 47µF
CIN = 2.2µF
COUT = 4.7µF
VOUT = 3.3V
200
100
0
200
100
0
0
1
2
3
4
5
6
7
-2
0
2
4
6
8
10
INPUT VOLTAGE (V)
-10
0
10
20
30
40
TIME (ms)
TIME (ms)
Supply Current vs. Supply
Voltage (3.3V Version)
Line Transient
Line Transient
120
100
80
60
40
20
0
10
5
15
10
5
CL = 1 µF
IL = 1mA
CL = 10 µF
IL = 1mA
0
-5
0
-108
-85
6
4
2
6
4
2
RL = 33Ω
0
1
2
3
4
5
6
7
8
9
10
-0.2
0
0.2
0.4
0.6
0.8
-0.1
0
0.1 0.2 0.3 0.4 0.5 0.6
TIME (ms)
SUPPLY VOLTAGE (V)
TIME (ms)
Supply Current vs. Supply
Voltage (3.3V Version)
Enable Transient
(3.3V Version)
Enable Transient
(3.3V Version)
60
50
40
30
20
10
0
5
4
3
2
1
5
4
3
2
1
CL = 4.7 µF
IL = 1mA
CL = 4.7 µF
IL = 100mA
0
-41
0
-41
RL = 66Ω
2
0
2
0
-2
-50
-2
-50
0
1
2
3
4
5
6
7
0
50 100 150 200 250 300
0
50 100 150 200 250 300
SUPPLY VOLTAGE (V)
TIME (µs)
TIME (µs)
Enable Current Threshold
vs. Temperature
Enable Voltage Threshold
vs. Temperature
Output Impedance
1000
100
10
35
30
25
20
15
10
5
1.6
1.4
1.2
1
CIN = 2.2µF
COUT = 4.7µF
CIN = 2.2µF
COUT = 4.7µF
IL = 100µA
IL = 1mA
1
ON
VEN = 5V
0.1
0.8
0.6
0.4
OFF
0.01
0.001
VEN = 2V
IL = 100mA
0
-5
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (Hz)
MIC5201
6
July 1998
MIC5201
Micrel
Ripple
vs. Frequency
Ripple
vs. Frequency
Ripple
vs. Frequency
100
100
80
60
40
20
0
100
80
60
40
20
0
80
60
40
20
0
IL = 100µA
IL = 1mA
IL = 100mA
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
July 1998
7
MIC5201
MIC5201
Micrel
MIC5201BM
Applications Information
Figure 1 shows a basic fixed-voltage application with the
unused enable input connected to V .
VIN
VOUT
IN
OUT
ADJ
GND
R1
R2
EN
3.3µF
IN
MIC5201-x.xBM
MIC5201-x.xBS
CADJ
VIN
VOUT
1µF
IN
OUT
EN
Figure 3. Decreasing Ouput Noise
Minimum Load
GND
TheMIC5201willremainstableandinregulationwithno load
unlike many other voltage regulators. This is especially
important in CMOS RAM keep-alive applications.
Figure 1. Fixed Application
Adjustable regulators require two resistors to set the output
voltage. See Figure 2.
Dual-Supply Systems
MIC5201BM
When used in dual supply systems where the regulator load
is returned to a negative supply, the output voltage must be
diode clamped to ground.Thermal Considerations
VIN
VOUT
IN
OUT
ADJ
GND
R1
R2
EN
3.3µF
Layout
R2
R1
V
= 1.242V 1+
OUT
The MIC5201-x.xBM (8-pin surface mount package) has the
following thermal characteristics when mounted on a single
layer copper-clad printed circuit board.
Figure 2. Adjustable Application
Resistors values are not critical because ADJ (adjust) has a
high impedance, but for best results use resistors of 470kΩ
or less.
PC Board
Dielectric
θ
JA
FR4
160° C/W
120° C/W
Ceramic
Output Capacitors
Multilayerboardshavingagroundplane,widetracesnearthe
pads, and large supply bus lines provide better thermal
conductivity.
A 1µF capacitor is recommended between the MIC5201
output and ground to prevent oscillations due to instability.
Larger values serve to improve the regulator’s transient
response. Most types of tantalum or aluminum electrolytics
will be adequate; film types will work, but are costly and
therefore not recommended. Many aluminum electrolytics
have electrolytes that freeze at about –30°C, so solid tanta-
lums are recommended for operation below –25°C. The
important parameters of the capacitor are an effective series
resistance of about 5Ω or less and a resonant frequency
above 500kHz. The value of this capacitor may be increased
without limit.
The “worst case” value of 160°C/W assumes no ground
plane, minimum trace widths, and a FR4 material board.
Nominal Power Dissipation and Die Temperature
The MIC5201-x.xBM at a 25°C ambient temperature will
operate reliably at up to 625mW power dissipation when
mounted in the “worst case” manner described above. At an
ambient temperature of 55°C, the device may safely dissi-
pate 440mW. These power levels are equivalent to a die
temperature of 125°C, the recommended maximum tem-
perature for non-military grade silicon integrated circuits.
At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to
0.47µF for current below 10mA or 0.33µF for currents below
1mA.
ForMIC5201-x.xBS(SOT-223package)heatsinkcharacter-
istics, please refer to Micrel Application Hint 17, P.C. Board
Heat Sinking.
Input Capacitors
A 1µF capacitor should be placed from the MIC5201 input to
ground if there is more than 10 inches of wire between the
input and the ac filter capacitor or if a battery is used as the
input.
50 mil
Noise Reduction Capacitors
245 mil
150 mil
On adjustable devices, a capacitor from ADJ to GND will
decrease high-frequency noise on the output. See Figure 3.
30 mil
50 mil
Figure 4. Min. Recommended SO-8 PCB Pads Size
MIC5201
8
July 1998
MIC5201
Micrel
Package Information
0.026 (0.65)
MAX)
PIN 1
0.157 (3.99)
0.150 (3.81)
DIMENSIONS:
INCHES (MM)
0.020 (0.51)
0.013 (0.33)
0.050 (1.27)
TYP
45°
0.0098 (0.249)
0.0040 (0.102)
0.010 (0.25)
0.007 (0.18)
0°–8°
0.197 (5.0)
0.189 (4.8)
0.050 (1.27)
0.016 (0.40)
SEATING
PLANE
0.064 (1.63)
0.045 (1.14)
0.244 (6.20)
0.228 (5.79)
8-Pin SOIC (M)
3.15 (0.124)
2.90 (0.114)
C
L
7.49 (0.295)
6.71 (0.264)
3.71 (0.146)
3.30 (0.130)
C
L
2.41 (0.095)
2.21 (0.087)
1.04 (0.041)
0.85 (0.033)
4.7 (0.185)
4.5 (0.177)
DIMENSIONS:
MM (INCH)
1.70 (0.067)
1.52 (0.060)
16°
10°
6.70 (0.264)
6.30 (0.248)
0.10 (0.004)
0.038 (0.015)
10°
MAX
0.02 (0.0008)
0.25 (0.010)
0.84 (0.033)
0.64 (0.025)
0.91 (0.036) MIN
SOT-223 (S)
July 1998
9
MIC5201
MIC5201
Micrel
MIC5201
10
July 1998
MIC5201
Micrel
July 1998
11
MIC5201
MIC5201
Micrel
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 1998 Micrel Incorporated
MIC5201
12
July 1998
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