MICREL MIC5210

MIC5210
Micrel
MIC5210
Dual 150mA LDO Regulator
Preliminary Information
General Description
Features
The MIC5210 is a dual linear voltage regulator with very low
dropout voltage (typically 10mV at light loads and 140mV at
100mA), very low ground current (225µA at 10mA output), and
better than 1% initial accuracy. It also features individual logiccompatible enable/shutdown control inputs.
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Both regulator outputs can supply up to 150mA at the same
time as long as each regulator’s maximum junction temperature is not exceeded.
Designed especially for hand-held battery powered devices,
the MIC5210 can be switched by a CMOS or TTL compatible
logic signal, or the enable pin can be connected to the supply
input for 3-terminal operation. When disabled, power consumption drops nearly to zero. Dropout ground current is
minimized to prolong battery life.
Key features include current limiting, overtemperature shutdown, and protection against reversed battery.
Micrel Mini 8™ MSOP package
Up to 150mA per regulator output
Low quiescent current
Low dropout voltage
Wide selection of output voltages
Tight load and line regulation
Low temperature coefficient
Current and thermal limiting
Reversed input polarity protection
Zero off-mode current
Logic-controlled electronic enable
Applications
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The MIC5210 is available in 2.7V, 2.8V, 3.0V, 3.3V, 3.6V, 4.0V
and 5.0V fixed voltage configurations. Other voltages are
available; contact Micrel for details.
Cellular telephones
Laptop, notebook, and palmtop computers
Battery powered equipment
Bar code scanners
SMPS post regulator/dc-to-dc modules
High-efficiency linear power supplies
Ordering Information
Part Number
Voltage
Accuracy
Junction Temp. Range*
Package
MIC5210-2.7BMM
2.7
1.0%
–40°C to +125°C
8-lead MSOP
MIC5210-2.8BMM
2.8
1.0%
–40°C to +125°C
8-lead MSOP
MIC5210-3.0BMM
3.0
1.0%
–40°C to +125°C
8-lead MSOP
MIC5210-3.3BMM
3.3
1.0%
–40°C to +125°C
8-lead MSOP
MIC5210-3.6BMM
3.6
1.0%
–40°C to +125°C
8-lead MSOP
MIC5210-4.0BMM
4.0
1.0%
–40°C to +125°C
8-lead MSOP
MIC5210-5.0BMM
5.0
1.0%
–40°C to +125°C
8-lead MSOP
Other voltages available. Contact Micrel for details.
Typical Application
MIC5210
Output A
1µF
tantalum
Output B
2.2µF
tantalum
1
8
2
7
3
6
4
5
CBYP
470pF
Enable A
Enable B
1µF
Enable may be connected to VIN
Low-Noise + Ultralow-Noise (Dual) Regulator
MM8 and Micrel Mini 8 are trademarks 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
February 2000
1
MIC5210
MIC5210
Micrel
Pin Configuration
OUTA
1
8
INA
GND
2
7
ENA
OUTB
3
6
INB
BYPB
4
5
ENB
MIC5210BMM
Pin Description
Pin Number
Pin Name
Pin Function
1
OUTA
Regulator Output A
2
GND
Ground.
3
OUTB
Regulator Output B
4
BYPB
Reference Bypass B: Connect external 470pF capacitor to GND to reduce
output noise in regulator “B”. May be left open.
5
ENB
Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
6
INB
Supply Input B
7
ENA
Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
8
INA
Supply Input A
Absolute Maximum Ratings
Recommended Operating Conditions
Supply Input Voltage (VIN) ............................ –20V to +20V
Enable Input Voltage (VEN) ........................... –20V to +20V
Power Dissipation (PD) ............................ Internally Limited
Storage Temperature Range ................... –60°C to +150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Supply Input Voltage (VIN) ............................... 2.5V to 16V
Enable Input Voltage (VEN) ................................. 0V to 16V
Junction Temperature (TJ) ....................... –40°C to +125°C
Thermal Resistance (θJA)......................................... Note 1
MIC5210
2
February 2000
MIC5210
Micrel
Electrical Characteristics
VIN = VOUT + 1V; IL = 100µA; CL = 1.0µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
Symbol
Parameter
Conditions
Min
Typical
VO
Output Voltage Accuracy
variation from specified VOUT
∆VO/∆T
Output Voltage
Temperature Coefficient
Note 2
∆VO/VO
Line Regulation
VIN = VOUT + 1V to 16V
0.004
0.012
0.05
%/V
%/V
∆VO/VO
Load Regulation
IL = 0.1mA to 150mA (Note 3)
0.02
0.2
0.5
%
%
VIN – VO
Dropout Voltage, Note 4
IL = 100µA
10
IL = 50mA
110
IL = 100mA
140
IL = 150mA
165
50
70
150
230
250
300
275
350
mV
mV
mV
mV
mV
mV
mV
mV
–1
–2
Max
Units
1
2
%
%
40
ppm/°C
IGND
Quiescent Current
VEN ≤ 0.4V (shutdown)
VEN ≤ 0.18V (shutdown)
0.01
1
5
µA
µA
IGND
Ground Pin Current, Note 5
(per regulator)
VEN ≥ 2.0V, IL = 100µA
80
IL = 50mA
350
IL = 100mA
600
IL = 150mA
1300
125
150
600
800
1000
1500
1900
2500
µA
µA
µA
µA
µA
µA
µA
µA
PSRR
Ripple Rejection
frequency = 100Hz, IL = 100µA
75
dB
ILIMIT
Current Limit
VOUT = 0V
320
∆VO/∆PD
Thermal Regulation
Note 6
0.05
%/W
eno
Output Noise (Regulator B only)
IL = 50mA, CL = 2.2µF,
470pF from BYPB to GND
260
nV/ Hz
500
mA
ENABLE Input
VIL
Enable Input Logic-Low Voltage
regulator shutdown
VIH
Enable Input Logic-High Voltage
regulator enabled
IIL
Enable Input Current
VIL ≤ 0.4V
VIL ≤ 0.18V
VIH ≥ 2.0V
VIH ≥ 2.0V
IIH
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
0.4
0.18
2.0
V
V
V
0.01
5
–1
–2
20
25
µA
µA
µA
µA
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, TJ(max), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power
dissipation at any ambient temperature is calculated using: PD(max) = (TJ(max) – TA) ÷ θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θJA of the 8-lead MSOP (MM) is 200°C/W
mounted on a PC board (see “Thermal Considerations” section for further 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 0.1mA to 150mA. 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.
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 VIN = 16V for t = 10ms.
February 2000
3
MIC5210
MIC5210
Micrel
Typical Characteristics
Power Supply
Rejection Ratio
-40
-60
-80
-40
-60
-80
IOUT = 100µA
COUT = 1µF
-100
1k 1E+4
1E+1
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
IOUT = 100mA
COUT = 1µF
-80
Power Supply
Rejection Ratio
0
-60
IOUT = 100µA
COUT = 2.2µF
CBYP = 0.01µF
-40
-60
-100
1k 1E+4
1E+1
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
Turn-On Time
vs. Bypass Capacitance
Power Supply Ripple Rejection
vs. Voltage Drop
10000
60
TIME (µs)
1000
IOUT = 10mA
COUT = 2.2µF
CBYP = 0.01µF
-80
-100
1k 1E+4
1E+1
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
10
10
-20
PSRR (dB)
IOUT = 100mA
50
40
10mA
30
20
COUT = 2.2µF
CBYP = 0.01µF
0
0.1
0.2
0.3
VOLTAGE DROP (V)
30
10mA
IOUT = 100mA
20
COUT = 1µF
10
0
0.1
0.2
0.3
VOLTAGE DROP (V)
0.4
Noise Performance
10
VIN = 6V
VOUT = 5V
10mA, COUT = 1µF
1
-40
-60
IOUT = 100mA
COUT = 2.2µF
CBYP = 0.01µF
-80
0.4
1mA
40
0
10000
0
1mA
70
60
100
1000
CAPACITANCE (pF)
50
Power Supply
Rejection Ratio
Power Supply Ripple Rejection
vs. Voltage Drop
100
90
80
100
-100
1k 1E+4
1E+1
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
4
NOISE (µV/√Hz)
-60
RIPPLE REJECTION (dB)
VIN = 6V
VOUT = 5V
-40
IOUT = 1mA
COUT = 2.2µF
CBYP = 0.01µF
-80
-100
1k 1E+4
1E+1
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
0
VIN = 6V
VOUT = 5V
-20
-40
Power Supply
Rejection Ratio
-20
IOUT = 10mA
COUT = 1µF
-100
1k 1E+4
1E+1
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
VIN = 6V
VOUT = 5V
-80
-100
1k 1E+4
1E+1
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
PSRR (dB)
-80
IOUT = 1mA
COUT = 1µF
PSRR (dB)
PSRR (dB)
PSRR (dB)
-20
-60
RIPPLE REJECTION (dB)
-60
0
VIN = 6V
VOUT = 5V
-40
MIC5210
-40
Power Supply
Rejection Ratio
0
-20
VIN = 6V
VOUT = 5V
-20
-100
1k 1E+4
1E+1
10k 1E+5
1M 1E+7
10M
10 1E+2
100k 1E+6
100 1E+3
FREQUENCY (Hz)
Power Supply
Rejection Ratio
10
0
0
VIN = 6V
VOUT = 5V
-20
PSRR (dB)
-20
PSRR (dB)
0
VIN = 6V
VOUT = 5V
Power Supply
Rejection Ratio
PSRR (dB)
0
Power Supply
Rejection Ratio
0.1
0.01
1mA
COUT = 1µF
CBYP = 10nF
(Reg. B only)
0.001
VOUT = 5V
0.0001
10 1E+2
1E+1
1k 1E+4
100 1E+3
10k 1E+5
100k 1E+6
1M 1E+7
10M
FREQUENCY (Hz)
February 2000
MIC5210
Micrel
Noise Performance
(Regulator B)
Noise Performance
10
0.01
VOUT = 5V
COUT = 10µF
electrolytic
1mA
0.0001
1k 1E+4
10 1E+2
1M 1E+7
10k 1E+5
100k 1E+6
10M
1E+1
100 1E+3
FREQUENCY (Hz)
0.1
VOUT = 5V
COUT = 22µF
1mA
0.001
tantalum
CBYP = 10nF
0.0001
1k 1E+4
10 1E+2
1M 1E+7
10k 1E+5
100k 1E+6
10M
1E+1
100 1E+3
FREQUENCY (Hz)
0.01
1mA
VOUT = 5V
COUT = 10µF
0.001 electrolytic
10mA
CBYP = 100pF
0.0001
1k 1E+4
10 1E+2
1M 1E+7
10k 1E+5
100k 1E+6
10M
1E+1
100 1E+3
FREQUENCY (Hz)
Dropout Voltage
vs. Output Current
0.1
VOUT = 5V
COUT = 10µF
electrolytic
CBYP = 1nF
1mA
0.0001
1k 1E+4
10 1E+2
1M 1E+7
10k 1E+5
100k 1E+6
10M
1E+1
100 1E+3
FREQUENCY (Hz)
February 2000
100mA
0.1
0.01
0.001
1mA
VOUT = 5V
COUT = 10µF
electrolytic
CBYP = 10nF
10mA
0.0001
10 1E+2
10M
100 1E+3
1k 1E+4
10k 1E+5
1E+1
100k 1E+6
1M 1E+7
FREQUENCY (Hz)
5
DROPOUT VOLTAGE (mV)
100mA
320
1
10mA
NOISE (µV/√Hz)
NOISE (µV/√Hz)
0.1
10
1
100mA
Noise Performance
(Regulator B)
10
0.001
100mA
0.01
Noise Performance
(Regulator B)
0.01
1
10mA
NOISE (µV/√Hz)
10mA
0.1
10
1
100mA
NOISE (µV/√Hz)
NOISE (µV/√Hz)
1
0.001
Noise Performance
(Regulator B)
10
280
+125°C
240
200
+25°C
160
120
–40°C
80
40
0
0
40
80
120
160
OUTPUT CURRENT (mA)
MIC5210
MIC5210
Micrel
Block Diagram
INA
OUTA
Bandgap
Ref.
V
REF
ENA
Current Limit
Thermal Shutdown
INB
OUTB
BYPB
CBYP
Bandgap
Ref.
V
REF
ENB
Current Limit
Thermal Shutdown
GND
MIC5210
6
February 2000
MIC5210
Micrel
Dual-Supply Operation
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.
Applications Information
Enable/Shutdown
Forcing EN (enable/shutdown) high (> 2V) enables the regulator. EN is compatible with CMOS logic gates.
If the enable/shutdown feature is not required, connect EN to
IN (supply input).
Input Capacitor
Thermal Considerations
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
The MIC5210-xxBMM (8-lead MSOP) has a thermal resistance of 200°C/W when mounted on a FR4 board with
minimum trace widths and no ground plane.
A 1µF capacitor should be placed from IN to GND 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.
Reference Bypass Capacitor
BYPB (reference bypass) is connected to the internal voltage
reference of regulator B. A 470pF capacitor (CBYP) connected
from BYPB to GND quiets this reference, providing a significant reduction in output noise. CBYP reduces the regulator
phase margin; when using CBYP, output capacitors of 2.2µF or
greater are generally required to maintain stability.
The start-up speed of the MIC5210 is inversely proportional to
the size of the reference bypass capacitor. Applications requiring a slow ramp-up of output voltage should consider
larger values of CBYP. Likewise, if rapid turn-on is necessary,
consider omitting CBYP.
If output noise is not a major concern, omit CBYP and leave
BYPB open.
θJA
FR4
200°C/W
MSOP Thermal Characteristics
For additional heat sink characteristics, please refer to Micrel
Application Hint 17, “Calculating P.C. Board Heat Sink Area
For Surface Mount Packages”.
Thermal Evaluation Examples
For example, at 50°C ambient temperature, the maximum
package power dissipation is:
PD(max) = (125°C – 50°C) ÷ 200°C/W
PD(max) = 375mW
If the intent is to operate the 5V version from a 6V supply at the
full 150mA load for both outputs in a 50°C maximum ambient
temperature, make the following calculation:
PD(each regulator) = (VIN – VOUT) × IOUT + (VIN × IGND)
PD(each regulator) = (6V – 5V) × 150mA + (6V × 2.5mA)
PD(each regulator) = 165mW
PD(both regulators) = 2 regulators × 165mW
PD(both regulators) = 330mW
The actual total power dissipation of 330mW is below the
375mW package maximum, therefore, the regulator can be
used.
Note that both regulators cannot always be used at their
maximum current rating. For example, in a 5V input to 3.3V
output application at 50°C, if one regulator supplies 150mA,
the other regulator is limited to a much lower current. The first
regulator dissipates:
PD = (5V – 3.3V) 150 + 2.5mA (5V)
PD = 267.5mW
Then, the load that the remaining regulator can dissipate must
not exceed:
375mW – 267.5mW = 107.5mW
This means, using the same 5V input and 3.3V output voltage,
the second regulator is limited to about 60mA.
Taking advantage of the extremely low-dropout voltage characteristics of the MIC5210, power dissipation can be reduced
by using the lowest possible input voltage to minimized the
input-to-output voltage drop.
Output Capacitor
An output capacitor is required between OUT and GND to
prevent oscillation. The minimum size of the output capacitor
is dependent upon whether a reference bypass capacitor is
used. 1.0µF minimum is recommended when CBYP is not
used (see Figure 2). 2.2µF minimum is recommended when
CBYP is 470pF (see Figure 1). Larger values improve the
regulator’s transient response. The output capacitor value
may be increased without limit.
The output capacitor should have an ESR (effective series
resistance) of about 5Ω or less and a resonant frequency
above 1MHz. Ultralow-ESR capacitors may cause a lowamplitude oscillation and/or underdamped transient response.
Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but are more expensive. Since
many aluminum electrolytic capacitors have electrolytes that
freeze at about –30°C, solid tantalum capacitors are recommended for operation below –25°C.
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.
No-Load Stability
The MIC5210 will remain stable and in regulation with no load
(other than the internal voltage divider) unlike many other
voltage regulators. This is especially important in CMOS RAM
keep-alive applications.
February 2000
PC Board
Dielectric
7
MIC5210
MIC5210
Micrel
Package Information
0.199 (5.05)
0.187 (4.74)
0.122 (3.10)
0.112 (2.84)
DIMENSIONS:
INCH (MM)
0.120 (3.05)
0.116 (2.95)
0.036 (0.90)
0.032 (0.81)
0.043 (1.09)
0.038 (0.97)
0.012 (0.30) R
0.012 (0.03)
0.0256 (0.65) TYP
0.008 (0.20)
0.004 (0.10)
5° MAX
0° MIN
0.007 (0.18)
0.005 (0.13)
0.012 (0.03) R
0.039 (0.99)
0.035 (0.89)
0.021 (0.53)
8-Pin MSOP (MM)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
USA
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.
© 2000 Micrel Incorporated
MIC5210
8
February 2000