MIC5247 DATA SHEET (11/05/2015) DOWNLOAD

MIC5247
Micrel, Inc.
MIC5247
150mA Low-Voltage µCap Linear Regulator
General Description
Features
The MIC5247 is an efficient and precise, low-voltage CMOS
voltage regulator optimized for ultra-low noise applications.
The MIC5247 offers better than 1% initial accuracy and
85µA constant ground current over load (typically 85µA).
The MIC5247 provides a very low-noise output, ideal for
RF applications where quiet voltage sources are required.
A noise bypass pin is also available for further reduction of
output noise.
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Designed specifically for handheld and battery-powered devices, the MIC5247 provides a logic compatible enable pin.
When disabled, power consumption drops nearly to zero.
Ultra-low noise
Low-voltage outputs
Load independent, ultra-low ground current: 85µA
150mA output current
Current limiting
Thermal shutdown
Tight load and line regulation
“Zero” off-mode current
Stability with low-ESR capacitors
Fast transient response
Logic-controlled enable input
Applications
The MIC5247 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in handheld wireless devices.
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Key features include current limit, thermal shutdown, a pushpull output for faster transient response, and an active clamp
to speed up device turnoff. Available in the 6-pin 2mm × 2mm
MLF™ package and the IttyBitty® SOT-23-5 package, the
MIC5247 also offers a range of fixed output voltages.
All support documentation can be found on Micrel’s web site
at www.micrel.com.
Cellular phones and pagers
Cellular accessories
Battery-powered equipment
Laptop, notebook, and palmtop computers
PCMCIA VCC and VPP regulation/switching
Consumer/personal electronics
SMPS post-regulator/DC-to-DC modules
High-efficiency linear power supplies
Typical Application
VIN MIC5247-x.xBM5
1
5
2
Enable
Shutdown
3
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
4
VIN
VOUT
COUT
ENABLE
SHUTDOWN
EN
CBYP
(optional)
VOUT
MIC5247-x.xBML
1
6
2
5
3
4
CBYP
COUT
(optional)
Ultra-Low-Noise 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
February 2006
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M9999-022406
MIC5247
Micrel, Inc.
Ordering Information
Part Number
Standard
Marking
Pb-Free
Marking**
Voltage*
Junction
Temp. Range
Package
MIC5247-1.5BM5
LU15
MIC5247-1.5YM5
LU15
1.5V
–40ºC to +125ºC
SOT-23-5
MIC5247-1.6BM5
LU16
MIC5247-1.6YM5
LU16
1.6V
–40ºC to +125ºC
SOT-23-5
MIC5247-1.8BM5
LU18
MIC5247-1.8YM5
LU18
1.8V
–40ºC to +125ºC
SOT-23-5
MIC5247-1.85BM5
LU1J
MIC5247-1.85YM5
LU1J
1.85V
–40ºC to +125ºC
SOT-23-5
MIC5247-2.0BM5
LU20
MIC5247-2.0YM5
LU20
2.0V
–40ºC to +125ºC
SOT-23-5
MIC5247-2.1BM5
LU21
MIC5247-2.1YM5
LU21
2.1V
–40ºC to +125ºC
SOT-23-5
MIC5247-2.2BM5
LU22
MIC5247-2.2YM5
LU22
2.2V
–40ºC to +125ºC
SOT-23-5
MIC5247-2.4BM5
LU24
MIC5247-2.4YM5
LU24
2.4V
–40ºC to +125ºC
SOT-23-5
MIC5247-1.8BD5
NU18
MIC5247-1.8YD5
NU18
1.8V
–40ºC to +125ºC
Thin SOT-23-5
MIC5247-2.0BD5
NU20
MIC5247-2.0YD5
NU20
2.0V
–40ºC to +125ºC
Thin SOT-23-5
MIC5247-1.5BML
U15
MIC5247-1.5YML
U15
1.5V
–40ºC to +125ºC
6-Pin 2mm x 2mm MLF™
MIC5247-1.6BML
U16
MIC5247-1.6YML
U16
1.6V
–40ºC to +125ºC
6-Pin 2mm x 2mm MLF™
MIC5247-1.8BML
U18
MIC5247-1.8YML
U18
1.8V
–40ºC to +125ºC
6-Pin 2mm x 2mm MLF™
MIC5247-1.85BML
U1J
MIC5247-1.85YML
U1J
1.85V
–40ºC to +125ºC
6-Pin 2mm x 2mm MLF™
* Other voltage options available, please contact Micrel Marketing for details.
** Over and under bar ( ) (__) symbols may not be to scale.
Pin Configuration
EN GND IN
2
3
EN 1
1
LUxx/
NUxx
GND 2
4
5
BYP
OUT
IN 3
6 BYP
5 NC
4 OUT
MIC5247-x.xBML / YML
6-Pin 2mm × 2mm MLF™ (ML)
(Top View)
MIC5247-x.xBM5 / YM5
MIC5247-x.xBD5 / YM5
(Top View)
Pin Description
Pin Number
SOT-23-5
Pin Number
MLF™-6
Pin Name
1
3
IN
2
2
GND
3
1
EN
Enable/Shutdown (Input): CMOS-compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
4
6
BYP
Reference bypass: Connect external 0.01pF capacitor to GND to reduce
output noise. May be left open.
5
4
OUT
Regulator output.
—
5
NC
—
EP
GND
M9999-022406
Pin Function
Supply input.
Ground.
No internal connection.
Ground. Internally connected to the exposed pad. Connect to ground pin.
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February 2006
MIC5247
Micrel, Inc.
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN) ....................................0V to +7V
Enable Input Voltage (VEN) ...................................0V to VIN
Junction Temperature (TJ) ....................................... +150°C
Storage Temperature (TS) ........................ –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ........................ 260°C
ESD Rating(3)
Input Voltage (VIN) .......................................... +2.7V to +6V
Enable Input Voltage (VEN) ...................................0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Package Thermal Resistance
SOT-23-5 (θJA) .................................................. 235°C/W
2mm × 2mm MLF™ (θJA) .................................... 90°C/W
Electrical Characteristics(4)
VIN = VOUT + 1.0V; VIN = VEN; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
Symbol
Parameter
Conditions
Min
VO
Output Voltage Accuracy
IOUT = 0mA
–1
–2
ΔVLNR
Line Regulation
VIN = 2.7V to 6V
ΔVLDR
VIN – VOUT
IQ
Load Regulation
Load Regulation for 1.5V and 1.6V
Dropout Voltage
Quiescent Current
IGND
Ground Pin Current(7)
PSRR
Power Supply Rejection
ILIM
–0.3
IOUT = 0.1mA to 150mA(5)
IOUT = 0.1mA to 150mA, VOUT = 1.5V or 1.6V
Max
Units
1
2
%
%
+0.3
%/V
2
3
%
3
4
%
IOUT = 150mA(6)
150
0.2
1
µA
IOUT = 0mA
85
150
µA
85
150
f ≤ 1kHz
50
VEN ≤ 0.4V (shutdown)
IOUT = 150mA
VOUT = 0V
160
mV
µA
dB
300
mA
Output Voltage Noise
COUT = 10µF, CBYP = 0.01µF,
f = 10Hz to 100kHz
30
µVrms
VIL
Enable Input Logic-Low Voltage
VIN = 2.7V to 5.5V, regulator shutdown
0.8
IEN
Enable Input Current
en
Current Limit
Typ
Enable Input
VIH
Enable Input Logic-High Voltage
1.6
V
1
V
0.01
µA
0.01
µA
500
Ω
Thermal Shutdown Temperature
150
°C
Thermal Shutdown Hysteresis
10
°C
Shutdown Resistance Discharge
VIN = 2.7V to 5.5V, regulator enabled
0.4
VIL ≤ 0.4V
VIH ≥ 1.6V
Thermal Protection
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating ratings.
3. Devices are ESD sensitive. Handling precautions recommended.
4. Specification for packaged product only.
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 a1V differential.
For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating voltage is 2.7V.
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.
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MIC5247
Micrel, Inc.
Typical Characteristics
40
20
ILOAD = 100µA
0
-40 -10 20 50 80 110 140
TEMPERATURE °C)
(
40
PSRR (dB)
ILOAD = 150mA
1
2
3
INPUT VOLTAGE (V)
4
100
80
60
40
20
ILOAD = 150mA
Dropout Characteristics
ILOAD = 100µA
1x106
1x105
1x104
1x103
1x102
1x103
1x10
2
OUTPUT CURRENT (mA)
Ground Pin Current
80
60
40
20
0
-40 -10 20 50 80 110 140
TEMPERATURE °C)
(
0
0
VIN = VOUT + 1
70
Ground Pin Current
0
0
500
ILOAD = 100µA
2
3
1
INPUT VOLTAGE (V)
4
Short Circuit Current
vs. Temperature
400
ILOAD =
150mA
300
200
1
20
1x10
71
ILOAD = 50mA
1k 10k 100k 1M
100
FREQUENCY (Hz)
2
60
1
1x101
10
3
80
M9999-022406
1x10
72
CBYP = 0.01 F
VIN = 2.8V
VOUT = 1.8V
COUT = 4.7 F
VOLTAGE OUT (V)
GROUND CURRENT (µA)
Ground Pin Current
74
73
100
60
0
0
-8
Ground Pin Current
80
100
CBYP = 0
GROUND CURRENT (µA)
GROUND CURRENT (µA)
100
75
1x10-6
1x10-7
Ground Current
vs. Output Current
1x101
FREQUENCY (Hz)
1x10
FREQUENCY (Hz)
1x100
20 IL = 150mA
VIN = 3.4V
10 VOUT = 2.4V
COUT = 10 F Ceramic
0
10 100 1k
10k 100k 1M
Noise Performance
-5
1x10
CBYP = 0
FREQUENCY (Hz)
CBYP = 0
20 IL = 100mA
VIN = 3.4V
10 V
OUT = 2.4V
COUT = 10µF Ceramic
0
GROUND CURRENT (µA)
30
30
-1
1 F
CBYP = 0
IL = 50mA
20
VIN = 3.4V
10 VOUT = 2.4V
COUT =10µF Ceramic
0
30
GROUND CURRENT (µA)
0.01 F
OUTPUT SPECTRAL NOISE DENSITY ( V/rt Hz)
PSRR (dB)
40
FREQUENCY (Hz)
Power Supply Rejection
Ratio
60
50
1x102
1x101
0
1x106
10
1x105
20
1x104
IL = 100µA
VIN = 3.4V
VOUT = 2.4V
COUT = 10µF Ceramic
30
0.01µF
1µF
40
40
SHORT CIRCUIT CURRENT (mA)
40
50 0.01µF
1x106
50
=0
50
1x105
BYP
PSRR (dB)
60 C
1x103
PSRR (dB)
70
Power Supply Rejection
Ratio
60
1µF
60
1x104
CBYP = 0.01µF
1x103
80 CBYP = 1µF
Power Supply Rejection
Ratio
70
1x102
Power Supply Rejection
Ratio
90
100
1
2
3
INPUT VOLTAGE (V)
4
4
VOUT = 0
0
-40 -10 20 50 80 110 140
TEMPERATURE °C)
(
February 2006
MIC5247
Micrel, Inc.
Typical Characteristics, cont.
COUT = 10µF
ILOAD = 100mA
0
1x10-5
2.3
-40 -10 20 50 80 110 140
TEMPERATURE °C)
(
Prop Delay
5
1x101
ILOAD = 100µA
1x100
50
Rise Time
1x10-3
100
1x10-4
TIME (µs)
150
2.4
February 2006
Turn-On Time
vs. Bypass Capacitance
1x10-1
200
1x10-2
Output Voltage
vs. Temperature
OUTPUT VOLTAGE (V)
2.5
BYPASS CAPACITOR(µF)
M9999-022406
MIC5247
Micrel, Inc.
Functional Characteristics
Load Transient Response
Line Transient Response
4.4V
COUT = 10µF
CBYP = 0
VIN = 3.4V
VOUT = 2.4V
3.4V
COUT = 10µF
VOUT = 2.4V
ILOAD = 100µA
100mA
100µA
TIME (100µs/div.)
M9999-022406
TIME (500µs/div.)
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MIC5247
Micrel, Inc.
Block Diagram
IN
Reference
Voltage
Startup/
Shutdown
Control
Quickstart/
Noise
Cancellation
EN
BYP
Thermal
Sensor
Undervoltage
Lockout
PU L L
UP
FAUL T
Error
Amplifier
Current
Amplifier
OUT
PU L L
DOWN
AC TIVE SH U TD OWN
GND
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Micrel, Inc.
Applications Information
resistance of the device and the following basic equation:
 T (max) − T A 
PD (max) =  J

θJA


Enable/Shutdown
The MIC5247 comes with an active-high enable pin that can
disable the regulator. Forcing the enable pin low disables the
regulator and sends it into a “zero” off-mode-current state.
In this state, current consumed by the regulator goes nearly
to zero. Forcing the enable pin high enables the output voltage. This part is CMOS and the enable pin cannot be left
floating; a floating enable pin may cause an indeterminate
state on the output.
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-toambient thermal resistance for the MIC5247.
Package
Input Capacitor
θJA 1” Square
Copper Clad
θJC
235°C/W
185°C/W
145°C/W
SOT-23-5 (M5)
An input capacitor is not required for stability. A 1µF input
capacitor is recommended when the bulk AC supply capacitance is more than 10 inches away from the device, or when
the supply is a battery.
Table 1. SOT-23-5 Thermal Resistance
The actual power dissipation of the regulator circuit can be
determined using the equation:
(
Output Capacitor
)
PD = VIN − VOUT × IOUT + VIN × IGND
The MIC5247 requires an output capacitor for stability. The
design requires 1µF or greater on the output to maintain stability. The capacitor can be a low-ESR ceramic chip capacitor.
The MIC5247 has been designed to work specifically with
low-cost, small chip capacitors. Tantalum capacitors can also
be used for improved capacitance over temperature. The
value of the capacitor can be increased without bound.
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 MIC5247-2.4BM5 at room
temperature with a minimum footprint layout, the maximum
input voltage for a set output current can be determined as
follows:
Bypass Capacitor
 125°C − 25 °C
PD (max) = 

 235°C /W 
PD (max) = 425mW
A capacitor can be placed from the noise bypass pin to ground
to reduce output voltage noise. The capacitor bypasses the
internal reference. A 0.01µF capacitor is recommended for
applications that require low-noise outputs.
The junction-to-ambient thermal resistance for the minimum
footprint is 235°C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using
the output voltage of 2.4V and an output current of 150mA,
the maximum input voltage can be determined. Because this
device is CMOS and the ground current is typically 100µA over
the load range, the power dissipation contributed by the ground
current is < 1% and can be ignored for this calculation.
The bypass capacitor can be increased without bound, further
reducing noise and improving PSRR. Turn-on time remains
constant with respect to bypass capacitance. Refer to the
“Typical Characteristics” section for a graph of turn-on time
vs. bypass capacitor.
Transient Response
The MIC5247 implements a unique output stage to dramatically improve transient response recovery time. The output is
a totem-pole configuration with a P-Channel MOSFET pass
device and an N-Channel MOSFET clamp. The N-Channel
clamp is a significantly smaller device that prevents the output
voltage from overshooting when a heavy load is removed.
This feature helps to speed up the transient response by
significantly decreasing transient response recovery time
during the transition from heavy load (100mA) to light load
(85µA).
425mW = (VIN – 2.4V) 150mA
425mW = VIN ×150mA – 360mW
785mW = VIN×150mA
VIN(max) = 5.2V
Therefore, a 2.4V application at 150mA of output current
can accept a maximum input voltage of 5.2V in a SOT-23-5
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.
Active Shutdown
The MIC5247 also features an active shutdown clamp, which
is an N-Channel MOSFET that turns on when the device is
disabled. This allows the output capacitor and load to discharge, de-energizing the load.
Fixed Regulator Applications
VIN MIC5247-x.xBM5
1
5
2
Thermal Considerations
3
The MIC5247 is designed to provide 150mA 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
M9999-022406
θJA Recommended
Minimum Footprint
VOU T
1µF
4
0.01µF
Figure 1. Ultra-Low-Noise Fixed Voltage Application
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February 2006
MIC5247
Micrel, Inc.
Figure 1 includes a 0.01µF capacitor for low-noise operation and shows EN (pin 3) connected to IN (pin 1) for an
application where enable/shutdown is not required. COUT =
1µF minimum.
VIN MIC5247-x.xBM5 VOU T
1
5
2
Enable
Shutdown
3
4
1.0µF
EN
Figure 2. Low-Noise Fixed Voltage Application
Figure 2 is an example of a low-noise configuration where
CBYP is not required. COUT = 1µF minimum.
February 2006
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M9999-022406
MIC5247
Micrel, Inc.
Package Information
SOT-23-5 (M)
TSOT-23-5 (D5)
M9999-022406
10
February 2006
MIC5247
Micrel, Inc.
6-Pin MLF™ (ML)
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
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 at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.
February 2006
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