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MIC5325-1.5YMT-TR [MICROCHIP]

1.5V FIXED POSITIVE LDO REGULATOR, 0.25V DROPOUT, PDSO6;
MIC5325-1.5YMT-TR
型号： MIC5325-1.5YMT-TR
厂家： MICROCHIP    MICROCHIP
描述：

1.5V FIXED POSITIVE LDO REGULATOR, 0.25V DROPOUT, PDSO6

光电二极管 输出元件 调节器
文件： 总11页 (文件大小：371K)
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MIC5325  
Low VIN/VOUT 400mA ULDO™  
with Ultra-Low IQ  
General Description  
Features  
The MIC5325 is a high-performance, µCap, low-dropout  
regulator, offering ultra-low operating current while  
maintaining very fast transient response. The MIC5325  
can source up to 400mA of output current and allows a low  
input supply voltage source to increase system efficiency.  
• Wide-input voltage range: 1.7V to 5.5V  
• Stable with 1µF ceramic output capacitor  
• Ultra-low-dropout voltage ULDO™ 110mV @ 400mA  
• ±2% voltage accuracy over temperature  
• Bias supply voltage range: 2.5V to 5.5V  
• Ultra-low ground current 35µA typical  
• 400mA maximum output current per LDO  
• Very fast transient response  
Ideal for battery operated applications; the MIC5325 offers  
high accuracy, extremely low dropout voltage, and low  
ground current at all load conditions. The MIC5325 can  
also be put into a zero-off-mode current state, drawing  
virtually no current when disabled.  
• Thermal-shutdown and current-limit protection  
• Tiny 6-pin 2mm x 2mm Thin MLF® package  
The MIC5325 is available in fixed-output voltages in the  
6-pin 2mm x 2mm Thin MLF® leadless package.  
Data sheets and support documentation can be found on  
Micrel’s web site at www.micrel.com.  
Applications  
• Low-power handheld devices  
• Portable electronics  
• GPS receivers  
• Post regulator  
___________________________________________________________________________________________________________  
Typical Application  
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  
M9999-030811-C  
March 2011  
Micrel, Inc.  
MIC5325  
Ordering Information  
Output  
Voltage  
Part Number  
Marking Code  
Temperature Range  
Package  
Lead Finish  
MIC5325-1.2YMT  
MIC5325-1.5YMT  
MIC5325-1.8YMT  
MIC5325-3.6YMT  
QG4  
QGF  
QGG  
QGV  
1.2V  
1.5V  
1.8V  
3.6V  
–40°C to +125°C  
–40°C to +125°C  
–40°C to +125°C  
–40°C to +125°C  
6-Pin 2mm x 2mm Thin MLF®  
6-Pin 2mm x 2mm Thin MLF®  
6-Pin 2mm x 2mm Thin MLF®  
6-Pin 2mm x 2mm Thin MLF®  
Pb-Free  
Pb-Free  
Pb-Free  
Pb-Free  
Notes:  
1. Other voltages available. Contact Micrel for details.  
2. ▲ = Pin 1 identifier.  
Pin Configuration  
6-Pin 2mm x 2mm Thin MLF® (MT)  
Pin Description  
Pin  
Number  
Pin Name  
Pin Function  
1
2
3
4
5
6
VBIAS  
GND  
IN  
Bias Input Voltage.  
Ground  
Power Input for LDO.  
OUT  
BYP  
EN  
Output of regulator.  
Bypass: Connect a capacitor to ground to reduce noise and reduce ripple rejection.  
Enable Input: Active High Input. Logic High = On; Logic Low = Off. Do not leave floating.  
M9999-030811-C  
March 2011  
2
Micrel, Inc.  
MIC5325  
Absolute Maximum Ratings(1)  
Operating Ratings(2)  
Supply Voltage (VIN)............................................0V to VBIAS  
Bias Voltage (VBIAS)................................................ 0V to 6V  
Enable Voltage (VEN)...........................................0V to VBIAS  
Power Dissipation (PD)...........................Internally Limited(3)  
Lead Temperature (soldering, 10 µsec.).................... 260°C  
Junction Temperature (TJ) ........................–40°C to +125°C  
Storage Temperature (Ts) .........................–65°C to +150°C  
ESD Rating(4)..................................................................2kV  
Supply Voltage (VIN)......................................... 1.7V to VBIAS  
Bias Voltage (VBIAS).......................................... 2.5V to 5.5V  
Enable Voltage (VEN)........................................... 0V to VBIAS  
Junction Temperature (TJ) ........................–40°C to +125°C  
Junction Thermal Resistance  
2x2 Thin MLF-6 (θJA) .........................................90°C/W  
Electrical Characteristics(5)  
VBIAS = 3.6V or VIN (whichever is greater); VIN = VOUT + 1V; COUT = 1µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C,  
unless noted.  
Parameter  
Condition  
Min.  
–2.0  
Typ.  
Max.  
+2.0  
0.6  
0.6  
2
Units  
%
Output Voltage Accuracy  
VBIAS Line Regulation  
VIN Line Regulation  
Load Regulation  
Variation from nominal VOUT  
VBIAS = VIN to 5.5V; VIN = VOUT + 1V  
VBIAS = 5.5V; VIN = VOUT + 1V to 5.5V  
IOUT = 100µA to 400mA  
0.03  
0.02  
0.3  
110  
35  
%
%
%
VIN Dropout Voltage  
Ground Pin Current  
Ground Pin Current in Shutdown  
IOUT = 400mA  
250  
55  
mV  
µA  
IOUT = 100µA to 400mA; VIN = VEN; VBIAS = 5.5V  
VEN ≤ 0.2V  
0.01  
60  
1
µA  
f = up to 1kHz; COUT = 1µF; no CBYP  
f = up to 1kHz; COUT = 1µF; CBYP = 10nF  
f = 1kHz – 20kHz; COUT = 1µ F; CBYP = 10nF  
VOUT = 0V  
dB  
Ripple Rejection  
65  
dB  
40  
dB  
Current Limit  
450  
680  
30  
mA  
µVRMS  
Output Voltage Noise  
Enable Inputs (EN)  
COUT = 1µF; CBYP = 10nF; 10Hz to 100kHz  
Logic Low  
0.2  
V
V
Enable Input Voltage  
Enable Input Current  
Logic High  
1.2  
VIL ≤ 0.2V  
0.01  
0.02  
150  
µA  
µA  
µs  
VIH ≥ 1V  
Turn-On Time  
COUT = 1µF; CBYP = 10nF  
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. Specification for packaged product only.  
M9999-030811-C  
March 2011  
3
Micrel, Inc.  
MIC5325  
Typical Characteristics  
Power Supply  
Power Supply  
Ground Current (V  
)
IN  
Rejection Ratio (V  
)
Rejection Ratio (V  
)
vs. V  
IN  
BIAS  
IN  
-120  
-100  
-80  
-60  
-40  
-20  
0
-120  
-100  
-80  
-60  
-40  
-20  
0
10  
9
8
7
6
5
4
3
2
1
0
100mA  
50mA  
100µA  
100µA (NO BYP)  
100µA  
100µA (NO BYP)  
400mA  
V
V
C
C
= V  
+1V  
V
BIAS  
V
OUT  
C
OUT  
C
BYP  
= 5.5V  
= 1.8V  
= 1µF  
V
V
C
C
= V  
+1V  
IN  
OUT  
IN  
OUT  
300mA  
= 1.2V  
= 1µF  
= 1.2V  
= 1µF  
OUT  
OUT  
BYP  
OUT  
OUT  
BYP  
400mA  
100  
= 0.01µF  
= 0.01µF  
= 0.01µF  
1.5  
2
2.5  
3
3.5  
4 4.5 5 5.5  
0.1  
1
10  
100  
1,000  
0.1  
1
10  
1,000  
VIN (V)  
FREQUENCY (kHz)  
FREQUENCY (kHz)  
Ground Current (V  
vs. Output Current  
)
Ground Current (V  
vs. Output Current  
)
BIAS  
Ground Current (Total)  
vs. Output Current  
IN  
30  
28  
26  
24  
22  
20  
18  
16  
14  
12  
10  
10  
9
8
7
6
5
4
3
2
1
0
18  
16  
14  
12  
10  
8
6
V
V
V
C
C
= 3.6V  
BIAS  
V
V
C
C
= 2.8V  
= 2.8V  
IN  
IN  
4
= 1.8V  
= 1.8V  
= 1µF  
OUT  
OUT  
BYP  
OUT  
OUT  
BYP  
= 1µF  
2
= 0.01µF  
= 0.01µF  
0
0
50 100 150 200 250 300 350 400  
OUTPUT CURRENT (mA)  
0
50 100 150 200 250300 350 400  
OUTPUT CURRENT (mA)  
0
50 100 150 200 250300 350 400  
OUTPUT CURRENT (mA)  
Output Voltage  
Dropout Voltage  
vs. Output Current  
Dropout Voltage  
vs. Temperature  
vs. V  
IN  
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
140  
120  
100  
80  
140  
120  
100  
80  
100µA  
400mA  
400mA  
60  
60  
V
V
C
C
C
C
= 3.6V  
= 2.8V  
= 1µF  
= 0.01µF  
= 1µF  
BIAS  
200mA  
100mA  
IN  
40  
40  
OUT  
BYP  
BAIS  
V
V
C
= 5.5V  
= 1.8V  
= 1µF  
BIAS  
OUT  
OUT  
20  
20  
= 1µF  
IN  
0
0
-40 -20  
0
20 40 60 80 100 120  
TEMPERATURE (°C)  
1
1.5  
2
2.5  
3
3.5  
4
4.5  
5
5.5  
0
50 100 150 200 250300 350 400  
OUTPUT CURRENT (mA)  
VIN (V)  
Ground Current (V  
vs. Temperature  
)
Current Limit  
Output Voltage  
vs. Output Current  
IN  
vs. V  
IN  
20  
18  
16  
14  
12  
10  
8
900  
875  
850  
825  
800  
775  
750  
725  
700  
675  
650  
625  
600  
1.8  
1.75  
1.7  
100µA  
V
V
C
C
C
= 3.6V  
= 2.8V  
= 1µF  
= 0.01µF  
BIAS  
6
V
V
C
C
= 5.5V  
= 1.8V  
= 1µF  
BIAS  
OUT  
OUT  
IN  
400mA  
1.65  
1.6  
4
V
= 3.6V  
= 1.8V  
OUT  
BYP  
BIAS  
V
V
= 2.8V  
IN  
2
= 1µF  
= 1µF  
IN  
IN  
OUT  
0
0
50 100 150 200 250300 350 400  
OUTPUT CURRENT (mA)  
-40 -20  
0
20 40 60 80 100 120  
1.5 2 2.5 3 3.5 4 4.5 5 5.5  
TEMPERATURE (°C)  
VIN (V)  
M9999-030811-C  
March 2011  
4
Micrel, Inc.  
MIC5325  
Typical Characteristics (Continued)  
Bias Current  
vs. Enable Voltage  
Output Noise  
Spectral Density  
Output Voltage  
vs. Temperature  
1.30  
1.25  
1.20  
1.15  
1.10  
20  
10  
1
V
V
= 4.5V  
IN  
400mA  
18  
16  
14  
12  
10  
8
= 1.8V  
OUT  
C
C
= 1µF  
= 0.01µF  
OUT  
BYP  
100µA  
V
V
V
C
C
C
= 3.6V  
= 1.8V  
BIAS  
0.1  
V
V
V
C
I
= 2.2V  
= 2.8V  
IN  
IN  
6
= 3.6V  
= 1.2V  
= 1µF  
BIAS  
OUT  
OUT  
OUT  
4
= 1µF  
IN  
= 1µF  
= 0.01µF  
OUT  
BYP  
2
= 100µA  
Noise (10Hz to 1MHz) = 59µV  
RMS  
OUT  
0
0.01  
10  
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5  
ENABLE VOLTAGE (V)  
100  
1K  
10K 100K 1M  
-40 -20  
0 20 40 60 80 100 120  
FREQUENCY (Hz)  
TEMPERATURE (°C)  
M9999-030811-C  
March 2011  
5
Micrel, Inc.  
MIC5325  
Functional Characteristics  
M9999-030811-C  
March 2011  
6
Micrel, Inc.  
MIC5325  
Functional Diagram  
CURRENT  
LIMIT  
VBIAS  
VOUT  
BYP  
VIN  
EN  
LDO  
QUICK START  
REFERENCE  
THERMAL  
LIMIT  
GND  
M9999-030811-C  
March 2011  
7
Micrel, Inc.  
MIC5325  
Bypass Capacitor  
Application 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 MIC5325 to drive a  
large capacitor on the bypass pin without significantly  
slowing turn-on time.  
The MIC5325 is a high performance, low-dropout linear  
regulator designed for low current applications requiring  
fast transient response. The MIC5325 utilizes two input  
supplies, significantly reducing dropout voltage, perfect for  
low-voltage, DC-to-DC conversion. The MIC5325 requires  
a minimum of external components.  
The MIC5325 regulator is fully protected from damage  
due to fault conditions, offering linear current limiting and  
thermal shutdown.  
Bias Supply Voltage  
Minimum Load Current  
VBIAS, requiring relatively light current, provides power to  
the control portion of the MIC5325. 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.  
The MIC5325, unlike most other regulators, does not  
require a minimum load to maintain output voltage  
regulation.  
Enable/Shutdown  
The MIC5325 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.  
Input Supply Voltage  
VIN provides the supply to power the LDO. The minimum  
input voltage is 1.7V, allowing conversion from low  
voltage supplies.  
Output Capacitor  
The MIC5325 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.  
Thermal Considerations  
The MIC5325 is designed to provide 400mA 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 1.8V, the output voltage is 1.2V  
and the output current = 400mA. The actual power  
dissipation of the regulator circuit can be determined  
using the equation:  
X7R/X5R dielectric-type ceramic capacitors are recom-  
mended 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.  
PD = (VIN – VOUT1) I OUT + VIN IGND  
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 = (1.8V – 1.2V) × 400mA  
PD = 0.18W  
Input Capacitor  
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:  
The MIC5325 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 performance 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.  
T
− TA  
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
J(max)  
PD(max)  
=
θJA  
TJ(max) = 125°C, the maximum junction temperature of the  
die θJA thermal resistance = 90°C/W.  
M9999-030811-C  
March 2011  
8
Micrel, Inc.  
MIC5325  
Bill of Materials  
Item  
C1, C2, C4  
C3  
Part Number  
Manufacturer Description  
Qty.  
VJ0603G105KXYCW1BC  
VJ0603Y103KXQCW1BC  
CRCW060310K0FKEA  
MIC5325-xxYMT  
Vishay(1)  
Murata(2)  
Capacitor, 1µF, 6.3V, Size 0603  
3
1
1
1
Capacitor, 0.01µF, 10V, Size 0603  
Resistor, 10k, 1%, 1/16W, Size 0603  
400mA ULDO™ with Ultra-Low IQ  
R3  
Vishay Dale(1)  
Micrel, Inc.(3)  
U1  
Notes:  
1. Vishay: www.vishay.com.  
2. Murata: www.murata.com.  
3. Micrel, Inc.: www.micrel.com.  
M9999-030811-C  
March 2011  
9
Micrel, Inc.  
MIC5325  
PCB Layout Recommendations  
Top Layer  
Bottom Layer  
M9999-030811-C  
March 2011  
10  
Micrel, Inc.  
MIC5325  
Package Information  
6-Pin 2mm x 2mm Thin MLF® (MT)  
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  
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This  
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,  
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual  
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability  
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties  
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.  
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.  
M9999-030811-C  
March 2011  
11  

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