Micrel MIC5207-4.0YM5 180ma low-noise ldo regulator Datasheet

MIC5207
180mA Low-Noise LDO Regulator
General Description
Features
The MIC5207 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 (720µA at 100mA output). The MIC5207
offers better than 3% initial accuracy.
Designed especially for hand-held, battery-powered
devices, the MIC5207 includes a CMOS or TTL compatible
enable/shutdown control input. When in shutdown, power
consumption drops nearly to zero.
Key MIC5207 features include a reference bypass pin to
improve its already low-noise performance, reversedbattery protection, current limiting, and overtemperature
shutdown.
The MIC5207 is available in fixed and adjustable output
voltage versions in a small SOT-23-5 package. Contact
Micrel for details.
For low-dropout regulators that are stable with ceramic
output capacitors, see the µCap MIC5245/6/7 family.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
•
•
•
•
•
•
•
•
•
•
•
Ultra-low-noise output
High output voltage accuracy
Guaranteed 180mA output
Low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Reversed-battery protection
“Zero” off-mode current
Logic-controlled electronic enable
Applications
•
•
•
•
•
•
•
Cellular telephones
Laptop, notebook, and palmtop computers
Battery-powered equipment
PCMCIA VCC and VPP regulation/switching
Consumer/personal electronics
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
Typical Application
Battery-Powered Regulator Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
December 2007
M9999-123107
Micrel, Inc.
MIC5207
Ordering Information
Marking
Voltage*
Junction Temp. Range
Package
Lead Finish
MIC5207-1.8BD5
Part Number
NE18
1.8V
–40° to +125°C
5-Pin Thin SOT-23
Standard
MIC5207BM5
LEAA
Adj.
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-1.8BM5
LE18
1.8V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-2.5BM5
LE25
2.5V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-2.8BM5
LE28
2.8V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-3.0BM5
LE30
3.0V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-3.2BM5
LE32
3.2V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-3.3BM5
LE33
3.3V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-3.6BM5
LE36
3.6V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-3.8BM5
LE38
3.8V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-4.0BM5
LE40
4.0V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-5.0BM5
LE50
5.0V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5207-3.3BZ***
--
3.3V
–40° to +125°C
3-Pin TO-92
Standard
MIC5207-1.8YD5
NE18**
1.8V
–40° to +125°C
5-Pin Thin SOT-23
Pb-Free
MIC5207YM5
LEAA**
Adj.
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-1.8YM5
LE18**
1.8V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-2.5YM5
LE25**
2.5V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-2.8YM5
LE28**
2.8V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-2.9YM5
LE29**
2.9V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-3.0YM5
LE30**
3.0V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-3.1YM5
LE31**
3.1V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-3.2YM5
LE32**
3.2V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-3.3YM5
LE33**
3.3V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-3.6YM5
LE36**
3.6V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-3.8YM5
LE38**
3.8V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-4.0YM5
LE40**
4.0V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-5.0YM5
LE50**
5.0V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5207-3.3YZ***
--
3.3V
–40° to +125°C
3-Pin TO-92
Pb-Free
*
Other voltages available. Contact Micrel for details.
** Under bar ( __ ) symbol may not be to scale.
*** TO-92 Package discontinuance notification issued September 2007. End-of-life-buy offered thru December 31, 2007. Contact factory for
additional information.
December 2007
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M9999-123107
Micrel, Inc.
MIC5207
Pin Configuration
1
IN
2
3
GND OUT
(Bottom View)
MIC5207BM5/YM5 (M5)
(Adjustable Voltage)
MIC5207-x.xBM5/YM5 (M5)
MIC5207-x.xBD5/YD5 (D5)
(Fixed Voltage)
MIC5207-x.xBZ/YZ (Z)
(Fixed Voltage)
Pin Description
Pin Number
SOT-23-5
Pin Number
TO-92
Pin Name
Pin Function
1
1
IN
Supply Input
2
2
GND
Ground
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable,
logic low or open = shutdown. Do not leave floating.
3
EN
4 (fixed)
BYP
Reference Bypass: Connect external 470pF capacitor to GND to reduce output
noise. May be left open. For 1.8V or 2.5V operation, see “Applications
Information.”
4 (adj.)
ADJ
Adjust (Input): Adjustable regulator feedback input. Connect to resistor voltage
divider.
OUT
Regulator Output
5
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Micrel, Inc.
MIC5207
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN).............................. –20V to +20V
Enable Input Voltage (VEN)............................. –20V to +20V
Power Dissipation (PD) .......................... Internally Limited (3)
Lead Temperature (soldering, 5 sec)......................... 260°C
Junction Temperature (TJ)
All except 1.8V....................................–40°C to +125°C
1.8V ONLY.............................................. 0°C to +125°C
Storage Temperature (TS).........................–65°C to +150°C
Supply Input Voltage (VIN)............................. +2.5V to +16V
Enable Input Voltage (VEN)..................................... 0V to VIN
Junction Temperature (TJ)
All except 1.8V.................................... –40°C to +125°C
1.8V ONLY.............................................. 0°C to +125°C
Thermal Resistance (θJA).......................................... Note 3
MSOP-8 (θJA) (3)
Electrical Characteristics
VIN = VOUT + 1V; IL = 100µA; CL = 1.0µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C < TJ < +125°C except
0°C < TJ < +125°C for 1.8V, unless noted.
Symbol
Parameter
Condition
VO
Output Voltage Accuracy
Variation from nominal VOUT
Min
Typ
∆VO/∆T
Output Voltage
Temperature Coefficient
Note 4
∆VO/VO
Line Regulation
VIN = VOUT + 1V to 16V
0.005
0.05
0.10
%/V
%/V
∆VO/VO
Load Regulation
IL = 0.1mA to 150mA, Note 5
0.05
0.5
0.7
%
%
VIN – VO
Dropout Voltage, Note 6
IL = 100µA
17
IL = 50mA
115
IL = 100mA
140
IL = 150mA
165
60
80
175
250
280
325
300
400
mV
mV
mV
mV
mV
mV
mV
mV
–3
–4
Max
Units
3
4
%
%
ppm/°C
40
IGND
Quiescent Current
VEN ≤ 0.4V (shutdown)
VEN ≤ 0.18V (shutdown)
0.01
1
5
µA
µA
IGND
Ground Pin Current, Note 7
VEN ≥ 2.0V, IL = 100µA
80
IL = 50mA
350
IL = 100mA
720
IL = 150mA
1800
130
170
650
900
1100
2000
2500
3000
µA
µA
µA
µA
µA
µA
µA
µA
PSRR
Ripple Rejection
ILIMIT
Current Limit
VOUT = 0V
320
∆VO/∆PD
Thermal Regulation
Note 8
0.05
%/W
eno
Output Noise
IL = 50mA, CL = 2.2µF,
470pF from BYP to GND
260
nV√Hz
December 2007
75
4
dB
500
mA
M9999-123107
Micrel, Inc.
Symbol
MIC5207
Parameter
Condition
Min
Typ
Max
Units
0.4
0.18
V
V
Enable Input
VIL
Enable Input Logic-Low Voltage
Regulator shutdown
VIH
Enable Input Logic-High
Voltage
Regulator enable
IIL
Enable Input Current
VIL ≤ 0.4V
VIL ≤ 0.18V
VIH ≥ 2.0V
VIH ≥ 2.0V
IIH
V
2.0
0.01
5
–1
–2
20
25
µA
µA
µA
µA
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation at any TA (ambient temperature) is PD(max) = (TJ(max) –TA) / θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. The θJA of the SOT-23-5 (M5) is 235°C/W, and the
TO-92 (Z) is 180°C/W (0.4” leads) or 160°C/W (0.25” leads) soldered on a PC board (see “Thermal Considerations” 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 180mA. 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 1Vdifferential.
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 180mA load pulse at VIN = 16V for t = 10ms.
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MIC5207
Typical Characteristics
0
Power Supply
Rejection Ratio
VIN = 6V
VOUT = 5V
PSRR (dB)
-20
-40
-60
-80
IOUT = 100µA
COUT = 1µF
-100
1E+11E+21E+3
10k 1E+51E+61E+7
10 100 1k 1E+4
100k 1M 10M
FREQUENCY (Hz)
0
Power Supply
Rejection Ratio
PSRR (dB)
-20
VIN = 6V
VOUT = 5V
-40
-60
-80
IOUT = 1mA
COUT = 1µF
-100
10k 1E+51E+61E+7
1E+11E+21E+3
10 100 1k 1E+4
100k 1M 10M
FREQUENCY (Hz)
PSRR (dB)
-20
Power Supply
Rejection Ratio
10000
VIN = 6V
VOUT = 5V
TIME (µs)
0
-40
-60
1000
IOUT = 10mA
COUT = 2.2µF
CBYP = 0.01µF
-80
-100
1E+11E+2
1k 1E+41E+51E+6
10k 100k 1M 1E+7
10 100 1E+3
10M
FREQUENCY (Hz)
PSRR (dB)
-20
Power Supply
Rejection Ratio
VIN = 6V
VOUT = 5V
-40
-60
-80
IOUT = 100mA
COUT = 2.2µF
CBYP = 0.01µF
-100
1E+1
10 1E+21E+31E+41E+51E+61E+7
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
December 2007
6
100
10
10
320
DROPOUT VOLTAGE (mV)
0
Turn-On Time
vs. Bypass Capacitance
100
1000
10000
CAPACITANCE (pF)
Dropout Voltage
vs. Output Current
280
240
200
+125°C
+25°C
160
120
80
–40°C
40
0
0
40
80
120
160
OUTPUT CURRENT (mA)
M9999-123107
Micrel, Inc.
MIC5207
Typical Characteristics (continued)
10
Noise Performance
10mA, COUT = 1µF
NOISE (µV/ Hz)
1
0.1
0.01
1mA
COUT = 1µF
CBYP = 10nF
0.001
VOUT = 5V
0.0001
1E+11E+21E+3
10 100 1k 1E+4
10k 1E+51E+6
100k 1M 1E+7
10M
FREQUENCY (Hz)
10
Noise Performance
NOISE (µV/ Hz)
1
100mA
0.1
0.01
1mA
VOUT = 5V
COUT = 10µF
0.001 electrolytic
10mA
CBYP = 100pF
0.0001
1E+11E+21E+3
10 100 1k 1E+4
10k 1E+5
100k 1E+61E+7
1M 10M
FREQUENCY (Hz)
December 2007
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Micrel, Inc.
MIC5207
Block Diagrams
Low-Noise Fixed Regulator (TO-92 version only)
Ultra-Low-Noise Fixed Regulator
Ultra-Low-Noise Adjustable Regulator
December 2007
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M9999-123107
Micrel, Inc.
MIC5207
No-Load Stability
The MIC5207 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
CMOSRAM keep-alive applications.
Application 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 (pin 3) to IN (supply input, pin 1). See Figure 1.
Thermal Considerations
The MIC5207 is designed to provide 180mA of
continuous current in a very small package. Maximum
power dissipation can be calculated based on the output
current and the voltage drop across the part. To
determine the maximum power dissipation of the
package, use the junction-to-ambient thermal resistance
of the device and the following basic equation:
Input Capacitor
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
BYP (reference bypass) is connected to the internal
voltage reference. A 470pF capacitor (CBYP) connected
from BYP 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 MIC5207 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 BYP open.
PD(MAX) =
θ JA
TJ(max) is the maximum junction temperature of the die,
125°C, and TA is the ambient operating temperature. θJA
is layout dependent; Table 1 shows examples of
junction-to-ambient thermal resistance for the MIC5207.
Package
θJA Recommemded
Minimum Footprint
θJA 1” Square
Copper Clad
θJ/C
SOT-23-5
(M5)
235°C/W
170°C/W
130°C/W
Table 1. SOT-23-5 Thermal Resistance
The actual power dissipation of the regulator circuit can
be determined using the equation:
PD = (VIN − VOUT ) IOUT + VIN IGND
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. Ultra-low-ESR capacitors can
cause a low amplitude oscillation on the output and/or
under-damped transient response. Most tantalum or
aluminum electrolytic capacitors are adequate; film types
will work, but are more expensive. Since many aluminum
electrolytics have electrolytes that freeze at about
–30°C, solid tantalums 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.
December 2007
(TJ(MAX) − TA )
Substituting PD(max) for PD and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5207-3.3BM5 at
room temperature with a minimum footprint layout, the
maximum input voltage for a set output current can be
determined as follows:
PD(MAX) =
125°C − 25°C
235
PD(MAX) = 425mW
The junction-to-ambient thermal resistance for the
minimum footprint is 220°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using the output voltage of 3.3V and
an output current of 150mA, the maximum input voltage
can be determined. From the Electrical Characteristics
table, the maximum ground current for 150mA output
current is 3000µA or 3mA.
455mW = (VIN − 3.3 ) 150mA + VIN ⋅ 3mA
455mW = VIN ⋅ 150mA - 495mW + VIN ⋅ 3mA
920mW = VIN ⋅ 153mA
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Micrel, Inc.
MIC5207
VIN(MAX) = 6.01V
Therefore, a 3.3V application at 150mA of output current
can accept a maximum input voltage of 6V in a SOT-235 package. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the
Regulator Thermals section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook
Figure 2. Low-Noise Fixed Voltage Application
Low-Voltage Operation
The MIC5207-1.8 and MIC5207-2.5 require special
consideration when used in voltage-sensitive systems.
They may momentarily overshoot their nominal output
voltages unless appropriate output and bypass capacitor
values are chosen.
During regulator power up, the pass transistor is fully
saturated for a short time, while the error amplifier and
voltage reference are being powered up more slowly
from the output (see “Block Diagram”). Selecting larger
output and bypass capacitors allows additional time for
the error amplifier and reference to turn on and prevent
overshoot.
To ensure that no overshoot is present when starting up
into a light load (100µA), use a 4.7µF output capacitance
and 470pF bypass capacitance. This slows the turn-on
enough to allow the regulator to react and keep the
output voltage from exceeding its nominal value. At
heavier loads, use a 10µF output capacitance and
470pF bypass capacitance. Lower values of output and
bypass capacitance can be used, depending on the
sensitivity of the system.
Applications that can withstand some overshoot on the
output of the regulator can reduce the output capacitor
and/or reduce or eliminate the bypass capacitor.
Applications that are not sensitive to overshoot due to
power-on reset delays can use normal output and
bypass capacitor configurations.
Please note the junction temperature range of the
regulator at 1.8V output (fixed and adjustable) is 0˚C to
+125˚C.
Figure 2 is an example of a
configuration. COUT = 1µF minimum.
basic
low-noise
Adjustable Regulator Applications
The MIC5207BM5 can be adjusted to a specific output
voltage by using two external resistors (Figure 3). The
resistors set the output voltage based on the following
equation:
R2 ⎞
⎛
VOUT = VREF ⎜1 +
⎟, VREF = 1.242V
R1 ⎠
⎝
This equation is correct due to the configuration of the
bandgap reference. The bandgap voltage is relative to
the output, as seen in the block diagram. Traditional
regulators normally have the reference voltage relative
to ground; therefore, their equations are different from
the equation for the MIC5207BM5.
Resistor values are not critical because ADJ (adjust) has
a high input impedance, but for best results use resistors
of 470kΩ or less. A capacitor from ADJ to ground
provides greatly improved noise performance.
Figure 3. Ultra-Low-Noise Adjustable Voltage Application
Figure 3 includes the optional 470pF noise bypass
capacitor from ADJ to GND to reduce output noise.
Fixed Regulator Applications
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.
USB Application
Figure 4 shows the MIC5207-3.3BZ (3-terminal, TO-92)
in a USB application. Since the VBUS supply may be
greater than 10 inches from the regulator, a 1µF input
capacitor is included.
Figure 1. Ultra-Low-Noise Fixed Voltage Application
Figure 1 includes a 470pF capacitor for ultra-low-noise
operation and shows EN (pin 3) connected to IN (pin 1)
for an application where enable/shutdown is not
required. COUT = 2.2µF minimum.
December 2007
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M9999-123107
Micrel, Inc.
MIC5207
Figure 4. Single-Port Self-Powered Hub
December 2007
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M9999-123107
Micrel, Inc.
MIC5207
Package Information
5-Pin SOT-23 (M5)
5-Pin Thin SOT-23 (D5)
December 2007
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M9999-123107
Micrel, Inc.
MIC5207
0.090 (2.286) Radius, t yp.
2
3
1
0.145 (3.683)
0.135 (3.429)
0.055 (1.397)
0.045 (1.143)
10° typ.
BOTTOM VIEW
0.085 (2.159) Diam.
0.185 (4.699)
0.175 (4.445)
5° typ.
0.185 (4.699)
0.175 (4.445)
0.090 (2.286) typ.
5° t yp.
Seat ing Plane
0.025 (0.635) Max
Uncont rolled
Lead Diamet er
0.500 (12.70) Min.
0.016 (0.406)
0.014 (0.356)
0.0155 (0.3937)
0.0145 (0.3683)
0.055 (1.397)
0.045 (1.143)
0.105 (2.667)
0.095 (2.413)
3-Pin TO-92 (Z)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2001 Micrel, Incorporated.
December 2007
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