MIC5325-1.8YMT [MICREL]
Low VIN/VOUT 400mA ULDO⑩ with Ultra-Low IQ; 低VIN / VOUT 400毫安ULDO ？以超低IQ
| 型号： | MIC5325-1.8YMT |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Low VIN/VOUT 400mA ULDO⑩ with Ultra-Low IQ |
| 文件： | 总11页 (文件大小：289K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
• Adjustable output voltage range: 0.8V to 2.0V
• 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.
The MIC5325 is available in fixed output voltages in the
6-pin 2mm x 2mm Thin MLF® leadless package.
• Thermal shutdown and current limit protection
• Tiny 6-pin 2mm x 2mm Thin MLF® 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
MIC5325-xxYMT
VBIAS
MIC23050
VIN
EN
VOUT
High Efficiency
DC-to-DC
Buck
Li-ion
2.7...4.2V
CBIAS
1µF
CIN
1µF
GND
BYP
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
M9999-040308-A
April 2008
Micrel, Inc.
MIC5325
Ordering Information
Part Number
MIC5325-1.2YMT
MIC5325-1.5YMT
MIC5325-1.8YMT
Note:
Marking
Voltage
1.2V
Temperature Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
Lead Finish
QG4
QGF
QGG
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
1.5V
1.8V
1. Other voltages available. Contact Micrel for details.
2. Contact Marketing for ADJ version availability.
3. ▲ = Pin 1 identifier.
Pin Configuration
VBIAS
GND
IN
1
2
3
6
5
4
EN
BYP/ADJ
OUT
6-Pin 2mm x 2mm Thin MLF® (MT)
Pin Description
Pin Number
Pin Name
VBIAS
GND
Pin Function
1
2
3
4
5
Bias Input Voltage.
Ground
IN
Power Input for LDO.
Output of regulator.
OUT
Bypass: Connect a capacitor to ground to reduce noise and reduce ripple
rejection.
BYP/ADJ
Adjust: Feedback input from external resistor divider.
6
EN
Enable Input: Active High Input. Logic High = On; Logic Low = Off; Do not leave
floating.
M9999-040308-A
April 2008
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
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; 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
Units
%
Output Voltage Accuracy
Reference Voltage
VBIAS Line Regulation
VIN Line Regulation
Load Regulation
Variation from nominal VOUT
ADJ pin voltage
0.7595
0.775 0.7905
V
VBIAS = 3.6V to 5.5V, VIN = VOUT +1V
VBIAS = 3.6V to 5.5V, VIN = VOUT +1V to 5.5V
IOUT = 100µA to 400mA
0.03
0.02
0.3
110
35
0.6
0.6
2
%/V
%/V
%
VIN Dropout Voltage
Ground Pin Current
Ground Pin Current in Shutdown
Ripple Rejection
IOUT = 400mA
250
55
1
mV
µA
IOUT = 100µA to 400mA, VIN = VEN, VBIAS = 5.5V
VEN ≤ 0.2V
0.01
60
µA
f = up to 1kHz; COUT = 1.0µF; no CBYP
f = up to 1kHz; COUT = 1.0µF; CBYP = 10nF
f = 1kHz – 20kHz; COUT = 1.0uF; CBYP = 10nF
VOUT = 0V
dB
50
65
dB
40
dB
Current Limit
450
680
30
mA
µVRMS
Output Voltage Noise
Enable Inputs (EN)
Enable Input Voltage
COUT = 1µF, CBYP = 10nF, 10Hz to 100kHz
Logic Low
0.2
V
V
Logic High
1.2
Enable Input Current
VIL ≤ 0.2V
0.01
0.02
150
µA
µA
µs
VIH ≥ 1.0V
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, 1.5k in series with 100pF.
5. Specification for packaged product only.
M9999-040308-A
April 2008
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
VBIAS = 5.5V
VOUT = 1.8V
COUT = 1µF
CBYP = 0.01µF
V
V
C
C
= V
+1V
IN
OUT
IN
OUT
300mA
= 1.2V
= 1µF
= 1.2V
= 1µF
OUT
OUT
BYP
OUT
OUT
BYP
400mA
= 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
100
1,000
VIN (V)
FREQUENCY (kHz)
FREQUENCY (kHz)
Ground Current (V
vs. Output Current
)
Ground Current (V
vs. Output Current
)
Ground Current (Total)
vs. Output Current
IN
BIAS
10
9
8
7
6
5
4
3
2
1
0
18
16
14
12
10
8
30
28
26
24
22
20
18
16
14
12
10
6
V
V
V
C
C
= 3.6V
= 2.8V
= 1.8V
= 1µF
= 0.01µF
BIAS
V
V
C
C
= 2.8V
IN
IN
4
= 1.8V
= 1µF
OUT
OUT
BYP
OUT
OUT
BYP
2
= 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
VBIAS = 3.6V
VIN = 2.8V
200mA
100mA
40
40
C
C
OUT = 1µF
BYP = 0.01µF
VBIAS = 5.5V
OUT = 1.8V
COUT = 1µF
20
20
V
CBAIS = 1µF
CIN = 1µF
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
VIN (V)
0
50 100 150 200 250300 350 400
OUTPUT CURRENT (mA)
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
VBIAS = 3.6V
6
VBIAS = 5.5V
V
IN = 2.8V
COUT = 1µF
BYP = 0.01µF
400mA
1.65
1.6
VOUT = 1.8V
COUT = 1µF
CIN = 1µF
4
VBIAS = 3.6V
C
V
V
IN = 2.8V
OUT = 1.8V
2
CIN = 1µF
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)
M9999-040308-A
April 2008
4
Micrel, Inc.
MIC5325
Typical Characteristics (continued)
Bias Current
vs. Enable Voltage
Output Voltage
vs. Temperature
Reference Voltage
vs. Temperature
1.30
1.25
1.20
1.15
1.10
0.900
20
18
16
14
12
10
8
VIN = 2.2V
400mA
V
V
BIAS = 3.6V
OUT = 1.2V
0.875
0.850
0.825
0.800
0.775
0.750
0.725
0.700
COUT = 1µF
IOUT = 100µA
100µA
VBIAS = 3.6V
VIN = 2.2V
VBIAS = 3.6V
VOUT = 1.2V
V
V
IN = 2.8V
OUT = 1.8V
6
4
CIN = 1µF
OUT = 1µF
CBYP = 0.01µF
C
OUT = 1µF
C
2
IOUT = 100µA
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
ENABLE VOLTAGE (V)
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
Output Noise
Spectral Density
10
1
V
V
C
C
= 4.5V
IN
= 1.8V
= 1µF
OUT
OUT
BYP
= 0.01µF
0.1
Noise (10Hz to 1MHz) = 59µVRMS
0.01
10
100
1K
10K 100K 1M
FREQUENCY (Hz)
M9999-040308-A
April 2008
5
Micrel, Inc.
MIC5325
Functional Characteristics
M9999-040308-A
April 2008
6
Micrel, Inc.
MIC5325
Functional Diagram
CURRENT
LIMIT
VBIAS
VOUT
BYP
VIN
EN
LDO
QUICK START
REFERENCE
THERMAL
LIMIT
GND
M9999-040308-A
April 2008
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.
M9999-040308-A
April 2008
8
Micrel, Inc.
MIC5325
R3
10k
U1
MIC5325-YMT
VBIAS
J6
EN
J1
VBIAS
VBIAS
EN
C1
1µF/6.3V
C3
J2
GND
GND
VIN
BYP/ADJ
VOUT
0.01µF/6.3V
C2
1µF/6.3V
VIN
VOUT
J4
J3
VIN
VO
C4
1µF/6.3V
J5
GND
Bill of Materials
Item
C1, C2, C4
C3
Part Number
Manufacturer
Description
Qty.
VJ0603G105KXYCW1BC
VJ0603Y103KXQCW1BC
CRCW060310K0FKEA
MIC5325-xxYMT
Vishay(1)
Murata(2)
Vishay Dale(1)
Micrel, Inc.(3)
Capacitor, 1µF, 6.3V, Size 0603
Capacitor, 0.01µF, 10V, Size 0603
Resistor, 10k, 1%, 1/16W, Size 0603
400mA ULDO™ with Ultra Low IQ
3
1
1
1
R3
U1
Notes:
1. Vishay: www.vishay.com
2. Murata: www.murata.com
3. Micrel, Inc.: www.micrel.com
M9999-040308-A
April 2008
9
Micrel, Inc.
MIC5325
PCB Layout Recommendations
Top Layer
Bottom Layer
M9999-040308-A
April 2008
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
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.
M9999-040308-A
April 2008
11
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