MIC5306-2.8YD5 [MICREL]
150mA Micropower Cap Baseband LDO; 150毫安微章基带LDO
| 型号： | MIC5306-2.8YD5 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 150mA Micropower Cap Baseband LDO |
| 文件： | 总8页 (文件大小：253K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5306
150mA Micropower µCap Baseband LDO
General Description
Features
The MIC5306 is a micropower, µCap low dropout
regulator designed for optimal performance in a small
space. It is capable of sourcing 150mA of output current
and only draws 16µA of operating current. This high
performance LDO offers fast transient response and
good PSRR while consuming a minimum of current.
• Input voltage range: 2.25V to 5.5V
• Ultra-low IQ: Only 16µA operating current
• Stable with ceramic output capacitor
• Low dropout voltage of 45mV @ 100mA
• High output accuracy
-
-
±1.0% initial accuracy
Ideal for battery operated applications; the MIC5306
offers 1% accuracy, extremely low dropout voltage
(45mV @ 100mA). Equipped with a TTL logic
compatible enable pin, the MIC5306 can be put into a
zero-off-mode current state, drawing no current when
disabled.
±2.0% over temperature
• Thermal Shutdown Protection
• Current Limit Protection
Applications
• Digital Logic Power Supply
• Stand-by power supply
• Cellular phones
The MIC5306 is a µCap design, operating with very
small ceramic output capacitors for stability, reducing
required board space and component cost.
• PDAs
• Portable electronics
• Notebook PCs
The MIC5306 is available in fixed output voltages in
Thin SOT23-5 packaging.
_________________________________________________________________________________________________________
Typical Application
Ground Pin Current
vs. Temperature
20
150mA
18
MIC5306
16
100µA
VIN
EN
14
12
10
8
VOUT
Applications
Co-processor
1µF
1µF
GND
6
V
V
= 2.8V
OUT
= 1µF
4
OUT
IN
OUT
= V
+ 1V
2
C
0
TEMPERATURE (°C)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-080805
(408) 955-1690
August 2005
Micrel, Inc.
MIC5306
Block Diagram
VIN
EN
OUT
1.25V
Reference
GND
Ordering Information
Part Number
Marking Code
Output
Junction Temperature Range
Package
Voltage
MIC5306-1.5YD5
MIC5306-2.8YD5
Note:
N915
N928
1.5V
2.8V
-40°C to 125°C
-40°C to 125°C
TSOT23-5
TSOT23-5
Other Voltage available. Contact Micrel for detail.
2
M9999-080805
(408) 955-1690
August 2005
Micrel, Inc.
MIC5306
Pin Configuration
GND
2
EN
3
VIN
1
4
5
N/C
OUT
MIC5306-x.xBD5
Pin Description
TSOT23
Pin
Pin Function
Pin No.
Description
1
2
3
IN
GND
EN
Supply Input
Ground
Enable Input. Active High. High = on, low = off.
Do not leave floating.
4
5
NC
No Connect
OUT
Output Voltage
3
M9999-080805
(408) 955-1690
August 2005
Micrel, Inc.
MIC5306
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN)..............................0V to 6V
Enable Input Voltage (VEN).............................0V to 6V
Power Dissipation (PD)...................Internally Limited(3)
Junction Temperature ....................... -40°C to +125°C
Lead Temperature (soldering, 5sec.).................260°C
Storage Temperature (Ts) ................. -65°C to +150°C
Supply Input Voltage (VIN)........................2.25V to 5.5V
Enable Input Voltage (EN1/EN2/LOWQ).................. 0V to VIN
Junction Temperature (TJ) ..................-40°C to +125°C
TSOT23-5(θJA) ............................................... 235°C
Electrical Characteristics
VIN = VOUT + 1.0V; COUT = 1.0µF, IOUT = 100µA; TI = 25°C, bold values indicate -40°C to +125, unless noted.
Parameter
Conditions
Min
-1
-2
Typ
Max
+1
+2
0.3
0.5
1
Units
%
%
Variation from nominal VOUT
Variation from nominal VOUT; -40°C to +125°C
VIN = VOUT +1V to 5.5V
Output Voltage Accuracy
Line Regulation
Load Regulation
0.01
0.5
%/V
%
I
OUT = 100µA to 150mA
1.5
IOUT = 50mA
25
45
65
Dropout Voltage(4)
mV
I
I
OUT = 100mA
OUT = 150mA
200
25
Ground Pin Current
Ground Pin Current in
Shutdown
16
µA
µA
IOUT = 0mA to 150mA; VIN = 5.5V
EN < 0.2V; VIN = 5.5V
f = 10Hz to 1kHz; COUT = 1
f = 20kHz; COUT = 1 F; IOUT = 150mA
V
0.01
1
µ
F; IOUT = 150mA
62
35
Ripple Rejection
dB
µ
Current Limit
175
285
150
15
500
mA
°C
°C
V
OUT = 0V
Thermal Shutdown
Thermal Shutdown Hysteresis
Output Voltage Noise
Enable Input
91
µVrms
C
OUT = 1µF; 10Hz to 100kHz
Logic Low
Logic High
VIL < 0.2V
0.2
V
Enable Input Voltage
1.0
V
0.01
0.01
250
1
1
500
µA
µA
µs
Enable Input Current
V
IH > 1.0V
Turn-on Time(5)
Notes:
COUT = 1µF
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 T (ambient temperature) is P
A
= T
– T / θ . Exceeding the maximum
J(max) A JA
D(max)
allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
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. For outputs below 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V.
5. Turn-on time is measured from Ven=1V of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator.
4
M9999-080805
(408) 955-1690
August 2005
Micrel, Inc.
MIC5306
Typical Characteristics
Ground Pin Current
vs. Output Current
Ground Pin Current
vs. Temperature
Ripple Rejection
20
18
16
14
12
10
8
20
18
16
14
12
10
8
-80
150mA
150mA
-70
-60
100µA
-50
-40
-30
-20
-10
0
100µA
6
6
V
V
C
= 2.8V
OUT
= 1µF
V
V
= 2.8V
OUT
= 1µF
4
OUT
IN
OUT
OUT
4
V
V
C
= 2.8V
OUT
= 1µF
OUT
IN
OUT
= V
+ 1V
= V
+ 1V
IN
= V
+ 1V
2
2
C
OUT
0
0
0.01 0.1
1
10
100 1000
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
FREQUENCY (kHz)
Dropout Voltage
vs. Output Current
Ground Pin Current
vs. Supply Voltage
Dropout Voltage
vs. Temperature
18
16
14
12
10
8
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
150mA
150mA
100µA
100mA
50mA
25mA
6
4
V
V
= 2.8V
OUT
= 1µF
OUT
IN
OUT
V
C
= 2.8V
= 1µF
OUT
OUT
= V
+ 1V
2
C
0
2
2.5
3
3.5
4
4.5
5
5.5
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Temperature
Output Voltage
vs. Supply Voltage
Output Noise
Spectral Density
1E+02
1E+01
1E-00
3
2.5
2
3.4
3.2
3
150mA
100µA
2.8
2.6
2.4
2.2
2
1.5
1
V = 2.8V
1E-01 OUT
V
V
= 2.8V
OUT
IN
V
= 3.8V
= V
+ 1V
IN
OUT
0.5
C
R
= 1µF
V
C
= 2.8V
= 1µF
C
OUT
I
= 1µF
OUT
OUT
OUT
OUT
= 100µA
OUT
1E-02
0
0
1
2
3
4
5
0.01 0.1
1
10 100 1000 10000
SUPPLY VOLTAGE (V)
FREQUENCY (kHz)
TEMPERATURE (°C)
Enable Threshold
vs. Temperature
Current Limit
vs. Supply Voltage
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
350
300
250
200
150
100
50
V
= 2.8V
= 1µF
OUT
OUT
C
0
3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
5
M9999-080805
(408) 955-1690
August 2005
Micrel, Inc.
MIC5306
Functional Characteristics
Enable Turn-On Transient
Line Transient Response
5V
4V
V
OUT = 2.8V
VOUT = 2.8V
IN = VOUT + 1V
COUT = 1µF
VIN = VOUT + 1V
COUT = 1µF
V
Time (400µs/div)
Time (100µs/div)
Load Transient Response
VOUT = 2.8V
VIN = VOUT + 1V
COUT = 1µF
Time (10µs/div)
6
M9999-080805
(408) 955-1690
August 2005
Micrel, Inc.
MIC5306
Because this device is CMOS and the ground current
is typically < 50µA over the load range, the power
Applications Information
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
Input Capacitance
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.
PD = (3.8V – 2.8V)
PD = 0.15W
⋅ 150mA
Output Capacitance
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:
An output capacitor is required between OUT and
GND to prevent oscillation. Larger values improve the
regulator’s transient response. The output capacitor
value may be increased without limit.
TJ(max) – TA
PD(max) =
The output capacitor should have below ESR 300mΩ
and a resonant frequency above 1MHz. Ultra-low-ESR
capacitors can cause a low amplitude oscillation on
the output and/or underdamped transient response.
Most tantalum or aluminum electrolytic capacitors are
adequate; film types will work, but are more
JA
TJ(max) = 125
°
C, the maximum junction temperature
C/W
of the die JA thermal resistance = 235
θ
°
Table 1 shows junction-to-ambient thermal resistance
for the MIC5306 in the TSOT23-5 package.
expensive. Since many aluminum electrolytics have
electrolytes that freeze at about –30
tantalums are recommended for operation below
–25 C.
°C, solid
θ
JA Recommended
Minimum Footprint
Package
θJC
°
At lower values of output current, less output
capacitance is required for output stability. The
TSOT23-5
235°C/W
2°C/W
Table 1. TSOT23-5 Thermal Resistance
capacitor can be reduced to 0.47
µF for current below
10mA or 0.33
µF for currents below 1mA.
Substituting PD for PD(max) and solving for the
ambient operating temperature will give the maximum
operating conditions for the regulator circuit. 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.
Enable
Forcing EN (enable/shutdown) high (>1V) 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).
Current Limit
For example, when operating the MIC5306-2.8 at an
input voltage of 3.8V and 150mA load with a minimum
footprint layout, the maximum ambient operating
temperature TA can be determined as follows:
There is overcurrent protection circuitry built into the
MIC5306. Even with the output grounded, current will
be limited to approximately 285mA. Further protection
is provided by thermal shutdown.
0.15W = (125°C - T) / 235C°/W
T = 89.75°C
Thermal Considerations
The MIC5306 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 3.8V,
the output voltage is 2.8V and the output current
equals 150mA.
Therefore, a 2.8V application at 150mA of output
current can accept an ambient operating temperature
of 89.8°C in a TSOT23-5 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. This information can
be found on Micrel's website at:
The actual power dissipation of the regulator circuit
can be determined using the equation:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
PD = (VIN – VOUT) IOUT + VIN IGND
7
M9999-080805
(408) 955-1690
August 2005
Micrel, Inc.
MIC5306
Package Information
5-Pin TSOT-23
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.
© 2005 Micrel, Inc.
8
M9999-080805
(408) 955-1690
August 2005
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