MIC5308-1.8YMT [MICREL]
Low VIN/VOUT 150mA High PSRR ULDO with Ultra-Low IQ; 低VIN / VOUT 150毫安高PSRR ULDO与超低IQ
| 型号： | MIC5308-1.8YMT |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Low VIN/VOUT 150mA High PSRR ULDO with Ultra-Low IQ |
| 文件： | 总11页 (文件大小：377K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5308
Low VIN/VOUT 150mA High PSRR
ULDO™ with Ultra-Low IQ
General Description
Features
The MIC5308 is a high performance, µCap low dropout
regulator, offering ultra-low operating current while
maintaining very fast transient response. The MIC5308
can source up to 150mA of output current and can
regulate down from a low input supply voltage to increase
system efficiency.
• Input voltage range: 1.6V to 5.5V
• Guaranteed 150mA over temperature
• Ultra Low dropout voltage of 45mV at 150mA
• High PSRR, up to 90dB @ 1kHz
• Output Voltage range: 0.8V to 2.0V
• Very low ground current – 23µA under full load
• Bias supply voltage range: 2.5V to 5.5V
• Stable with 1µF ceramic output capacitor
• 150mA maximum output current at 1.6V input voltage
• Very fast transient response – ideal for digital loads
• Thermal shutdown and current limit protection
• Tiny 6-pin 1.6mm x 1.6mm Thin MLF® package
• Cost effective 6-pin TSOT-23 package
Ideal for battery operated applications; the MIC5308 offers
extremely low dropout voltage 45mV typically @ 150mA,
and low ground current at all load conditions (typically
23µA). The MIC5308 can also be put into a zero-off-mode
current state, drawing virtually no current when disabled.
The MIC5308 is available in fixed output voltages in the
tiny 6-pin 1.6mm x 1.6mm thin MLF® leadless package as
well as the 6-pin TSOT-23 for cost sensitive applications.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Applications
• Mobile Phones
• PDAs
• GPS Receivers
• Portable Electronics
___________________________________________________________________________________________________________
Typical Application
MIC5308
BIAS
1.2V / 150mA
VOUT
BYP
VIN
MIC23050
DC-to-DC
Converter
Li-Ion
2.7V to 4.2V
EN
CBIAS
1µF
CIN
1µF
GND
CBYP
10nF
COUT
1µF
ULDO is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-110807-B
November 2007
Micrel, Inc.
MIC5308
Ordering Information
Part Number
Voltage
Marking Codes
Temperature Range
Package
MIC5308-1.2YMT
MIC5308-1.5YMT
MIC5308-1.8YMT
MIC5308YMT
1.2V
1.5V
1.8V
Adj.
▲1R2
▲1R5
▲1R8
▲ARA
QR12
QR15
QR18
QRAA
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
6-Pin 1.6mm x 1.6mm Thin MLF®
6-Pin 1.6mm x 1.6mm Thin MLF®
6-Pin 1.6mm x 1.6mm Thin MLF®
6-Pin 1.6mm x 1.6mm Thin MLF®
6-Pin TSOT-23
MIC5308-1.2YD6
MIC5308-1.5YD6
MIC5308-1.8YD6
MIC5308YD6
1.2V
1.5V
1.8V
Adj.
6-Pin TSOT-23
6-Pin TSOT-23
6-Pin TSOT-23
Notes
For other voltage options. Contact Micrel Marketing for details.
Pin 1 identifier = ▲
.
Pin Configuration
GND
2
BIAS
3
VIN
1
BIAS
GND
VIN
1
2
3
6
5
4
BYP/ADJ
EN
VOUT
4
5
6
EN
BYP/ADJ
VOUT
6-Pin 1.6mm x 1.6mm Thin MLF® (MT)
6-Pin TSOT-23 (D6)
Pin Description
Pin Number
Thin MLF-6
Pin Number
Pin Name
Pin Function
TSOT-23-6
3
2
1
1
2
3
VIN
GND
BIAS
BYP
Power Input for LDO.
Ground
Bias Input Voltage.
Bypass: Connect a capacitor to ground to reduce noise and
reduce ripple rejection.
6
4
ADJ
EN
Adjustable: Feedback input from external resistor divider.
5
4
5
6
Enable Input: Active High Input. Logic High = On;
Logic Low = Off; Do not leave floating.
VOUT
Output of regulator.
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November 2007
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Micrel, Inc.
MIC5308
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN)............................................0V to VBIAS
Bias Supply Voltage (VBIAS).................................. 0V to +6V
Enable Voltage (VEN)...........................................0V to VBIAS
Power Dissipation, ................................Internally Limited(3)
Lead Temperature (soldering, 10µsec.)..................... 260°C
Storage Temperature (Ts) .........................–65°C to +150°C
ESD Rating(4)..................................................................3kV
Supply Voltage (VIN)........................................+1.6V to VBIAS
Bias Supply Voltage (VBIAS).......................... +2.5V to +5.5V
Enable Input Voltage (VEN)...................................0V to VBIAS
Junction Temperature (TJ) ........................–40°C to +125°C
Junction Thermal Resistance
1.6x1.6 MLF-6 (θJA) ...........................................90°C/W
TSOT-23-6 (θJA)...............................................235°C/W
Electrical Characteristics
VBIAS = 3.6V; VIN = VOUT + 1V; VIN ≤ VBIAS; COUT = 1.0µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C,
unless noted.
Parameter
Condition
Min
2.0
Typ
Max
+2.0
Units
%
Output Voltage Accuracy Variation from nominal VOUT
–
Reference Voltage
VBIAS Line Regulation
VIN Line Regulation
Load Regulation
ADJ pin voltage
BIAS = 3.6 to 5.5V, VIN = VOUT + 1V
0.7595
0.775 0.7905
V
0.01
0.02
0.2
0.3
0.2
1
%/V
%/V
%
V
VIN = VOUT + 1V, VBIAS = 5.5V
IOUT = 100µA to 150mA
IOUT = 150mA
Dropout Voltage
Ground Pin Current(5)
45
150
35
mV
µA
IOUT = 100µA to 150mA
VEN ≤ 0.2V
23
Ground Pin Current in
Shutdown
0.01
2.0
µA
VIN Ripple Rejection
f = up to 1kHz; COUT = 1.0µF; no CBYP
f = up to 1kHz;COUT = 1.0µF; CBYP = 10nF
f = 20kHz; COUT = 1.0µF; CBYP = 10nF
70
90
80
dB
dB
dB
50
Current Limit
f = up to 1kHz;COUT = 1.0µF; CBYP = 10nF
f = 20kHz; COUT = 1.0µF; CBYP = 10nF
180
325
28
mA
Output Voltage Noise
Enable Inputs (EN)
Enable Input Voltage
µVRMS
Logic Low
0.2
V
V
Logic High
1.2
Enable Input Current
VIL ≤ 0.2V
0.17
1.5
1
1
µA
µA
µs
VIH ≥ 1.2V
Turn-on Time
COUT = 1.0µF; CBYP = 10nF
150
500
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 of any TA (ambient temperature) is 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.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF.
5. IGND = IIN + IBIAS – IOUT
.
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November 2007
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Micrel, Inc.
MIC5308
Typical Characteristics
Power Supply
Rejection Ratio (V
Power Supply
Ground Current (V
vs. Temperature
)
IN
)
Rejection Ratio (V
)
IN
BIAS
-120
-100
-80
-60
-40
-20
0
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
9
8
7
6
5
4
3
2
1
0
100µA
100mA
100µA
100µA (no byp)
150mA
100µA
150mA
150mA
= V + 1V
OUT
50mA
50mA
V
V
V
= 2.2V
V
V
C
C
IN
IN
= 3.6V
= 1.2V
= 1µF
= 1.2V
= 1µF
= 0.01µF
BIAS
OUT
V
V
C
= 2.8V
OUT
IN
OUT
= 1.8V
= 1µF
OUT
BYP
C
OUT
OUT
20 40 60 80
10
100
1K
10K 100K 1M
10
100
1K
10K 100K 1M
FREQUENCY (Hz)
FREQUENCY (Hz)
TEMPERATURE (°C)
Ground Current (V
vs. Output Current
)
Ground Current (V
)
BIAS
Ground Current (Total)
vs. Output Current
IN
vs. Output Current
10
9
8
7
6
5
4
3
2
1
0
16
14
12
10
8
30
28
26
24
22
20
18
16
14
12
10
6
V
V
V
= 2.2V
V
V
C
C
= 2.2V
V
V
= 2.2V
IN
IN
IN
4
= 3.6V
= 1.2V
= 1µF
= 3.6V
= 1µF
= 1µF
= 3.6V
= 1µF
= 1µF
BIAS
OUT
BIAS
BIAS
C
OUT
C
BYP
OUT
BYP
2
C
OUT
0
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
Ground Current (V
)
Dropout Voltage
vs. Temperature
Bias Current
vs. Enable Voltage
IN
vs. V
IN
10
9
8
7
6
5
4
3
2
1
0
80
70
60
50
40
30
20
10
0
40
35
30
25
20
15
10
5
150mA
100µA
100µA
150mA
150mA
V
V
C
= 5.5V
= 1.8V
= 1µF
V
V
C
= 5.5V
= 1.8V
= 1µF
BIAS
OUT
BIAS
OUT
C
OUT
= 1µF
OUT
OUT
0
0
1
2
3
4
5
1.5
2
2.5
3
3.5
4 4.5 5 5.5
20 40 60 80
ENABLE VOLTAGE (V)
VIN (V)
TEMPERATURE (°C)
Dropout Voltage
vs. Output Current
Output Voltage
vs. Temperature
Output Voltage
vs. Output Current
50
45
40
35
30
25
20
15
10
5
1.30
1.25
1.20
1.15
1.10
1.30
1.25
1.20
1.15
1.10
V
V
V
= 2.2V
IN
V
V
V
= 2.2V
= 3.6V
= 1.2V
= 1µF
IN
BIAS
= 3.6V
= 1.2V
= 1µF
BIAS
OUT
C
I
OUT
OUT
C
C
OUT
= 1µF
= 100µA
OUT
OUT
0
25 50 75 100 125
OUTPUT CURRENT (mA)
0
25 50 75 100 125 150
OUTPUT CURRENT (mA)
20 40 60 80
TEMPERATURE (°C)
M9999-110807-B
November 2007
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Micrel, Inc.
MIC5308
Typical Characteristics (continued)
Output Voltage
Reference Voltage
vs. Temperature
Current Limit
vs. V
vs. V
IN
IN
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.900
400
350
300
250
200
150
100
V
V
V
= 2.2V
IN
0.875
0.850
0.825
0.800
0.775
0.750
0.725
0.700
= 3.6V
= 1.2V
= 1µF
BIAS
OUT
C
OUT
100µA
I
= 100µA
OUT
150mA
V
V
C
= 5.5V
= 1.2V
= 1µF
BIAS
OUT
V
V
= 1.8V
= 3.6V
OUT
BIAS
OUT
1.5
2
2.5
3
3.5
4 4.5 5 5.5
0
1
2
3
4
5
20 40 60 80
VIN (V)
VIN (V)
TEMPERATURE (°C)
Output Noise
Spectral Density
10
1
0.1
0.01
C
C
= 1µF
= 0.01µF
OUT
BYP
I
LOAD
0.001
10
100
1K
10K 100K 1M
FREQUENCY (Hz)
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November 2007
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Micrel, Inc.
MIC5308
Functional Characteristics
M9999-110807-B
November 2007
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Micrel, Inc.
MIC5308
Functional Diagram
MIC5308 Block Diagram
M9999-110807-B
November 2007
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Micrel, Inc.
MIC5308
Bypass Capacitor
Applications Information
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 bypass capacitor can be increased, further
reducing noise and improving PSRR. Turn-on time
increases slightly with respect to bypass capacitance. A
unique, quick-start circuit allows the MIC5308 to drive a
large capacitor on the bypass pin without significantly
slowing turn-on time.
The MIC5308 is a high performance, low-dropout linear
regulator designed for low current applications requiring
fast transient response. The MIC5308 utilizes two input
supplies, significantly reducing dropout voltage, perfect
for low-voltage, DC-to-DC conversion. The MIC5308
requires a minimum of external components.
The MIC5308 regulator is fully protected from damage
due to fault conditions, offering linear current limiting and
thermal shutdown.
Bias Supply Voltage
Minimum Load Current
V
BIAS, requiring relatively light current, provides power to
The MIC5308, unlike most other regulators, does not
require a minimum load to maintain output voltage
regulation.
the control portion of the MIC5308. Bypassing on the
bias pin is recommended to improve performance of the
regulator during line and load transients. 1µF ceramic
capacitor from VBIAS to ground helps reduce high
frequency noise from being injected into the control
circuitry from the bias rail and is good design practice.
Adjustable Regulator Design
The MIC5308 adjustable version allows programming
the output voltage anywhere between 0.8Vand 2V. Two
resistors are used. The resistor values are calculated by:
Input Supply Voltage
V
⎛
⎞
OUT
VIN provides the supply to power the LDO. The minimum
input voltage is 1.6V, allowing conversion from low
voltage supplies.
R1 = R2× ⎜
− 1⎟
⎜
⎟
0.775
⎝
⎠
Where VOUT is the desired output voltage.
Output Capacitor
Enable/Shutdown
The MIC5308 requires an output capacitor of 1µF or
greater to maintain stability. The design is optimized for
use with low-ESR ceramic chip capacitors. High ESR
capacitors may cause high frequency oscillation. The
output capacitor can be increased, but performance has
been optimized for a 1µF ceramic output capacitor and
does not improve significantly with larger capacitance.
The MIC5308 comes with a single active-high enable pin
that allows the regulator to be disabled. 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. The
active-high enable pin uses CMOS technology and the
enable pin cannot be left floating; a floating enable pin
may cause an indeterminate state on the output.
X7R/X5R dielectric-type ceramic capacitors are recomm-
ended because of their temperature performance. X7R-
type capacitors change capacitance by 15% over their
operating temperature range and are the most stable
type of ceramic capacitors. Z5U and Y5V dielectric
capacitors change value by as much as 50% and 60%,
respectively, over their operating temperature ranges. To
use a ceramic chip capacitor with Y5V dielectric, the
value must be much higher than an X7R ceramic
capacitor to ensure the same minimum capacitance over
the equivalent operating temperature range.
Thermal Considerations
The MIC5308 is designed to provide 150mA of
continuous current in a very small package. Maximum
ambient operating temperature can be calculated based
on the output current and the voltage drop across the
part. Given that the input voltage is 3.3V, the output
voltage is 1.2V and the output current = 150mA. The
actual power dissipation of the regulator circuit can be
determined using the equation:
Input Capacitor
PD = (VIN – VOUT1) I OUT + VIN IGND
The MIC5308 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1µF capacitor is
required from the input to ground to provide stability.
Low-ESR ceramic capacitors provide optimal perform-
ance at a minimum of space. Additional high-frequency
capacitors, such as small-valued NPO dielectric-type
capacitors, help filter out high-frequency noise and are
good practice in any RF-based circuit.
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.
PD = (3.3V – 1.2V) × 150mA
PD = 0.315W
M9999-110807-B
November 2007
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Micrel, Inc.
MIC5308
To determine the maximum ambient operating
temperature of the package, use the junction-to-ambient
thermal resistance of the device and the following basic
equation:
T
− TA
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
J(max)
PD(max)
=
θJA
TJ(max) = 125°C, the maximum junction temperature of
the die θJA thermal resistance = 90°C/W.
M9999-110807-B
November 2007
9
Micrel, Inc.
MIC5308
Package Information
6-Pin 1.6mm x 1.6mm Thin MLF® (MT)
6-Pin TSOT-23 (D6)
M9999-110807-B
November 2007
10
Micrel, Inc.
MIC5308
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.
© 2007 Micrel, Incorporated.
M9999-110807-B
November 2007
11
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