MIC5314-1.5/1.2YMT [MICREL]
Low Voltage Dual 300mA LDO with Power on Reset; 低电压双路，300mA LDO，具有上电复位
| 型号： | MIC5314-1.5/1.2YMT |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | Low Voltage Dual 300mA LDO with Power on Reset |
| 文件： | 总14页 (文件大小：358K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5314
Low Voltage Dual 300mA LDO
with Power on Reset
General Description
Features
The MIC5314 is a high performance, dual low input
voltage, low dropout regulator with Power On Reset
(POR). Major features include two 300mA LDOs, input
voltage down to 1.7V, ultra low drop out of 85mV at full
load, and Power On Reset. Each LDO has its own low
voltage input for system flexibility. The low input voltages
and low drop out operation provides high efficiency by
reducing the input to output voltage step which minimizes
the regulator power loss. An adjustable delay time POR
output is provided for the second regulator for design
flexibility.
• 300mA output current for each LDO
• Dual low voltage regulator inputs: 1.7V to 5.5V
• Low output voltage range: 0.8V to 2.0V
• Ultra-low dropout voltage of 85mV @ 300mA
• Power On Reset output with adjustable delay
• Stable with 1µF ceramic output capacitors
• Very fast transient response
• Thermal shutdown and current limit protection
• Tiny 12-pin 2.5mm x 2.5mm Thin MLF® package
Ideal for battery operated applications; the MIC5314 offers
1% accuracy and low ground current to increase light load
efficiency. The MIC5314 can also be put into a zero-off-
mode current state, drawing virtually no current when
disabled.
Applications
• Mobile Phones
• GPS and Navigation Devices
• Portable Media Players
• Digital still and video cameras
• PDAs
The MIC5314 is available in fixed output voltages in the
12-pin 2.5mm x 2.5mm Thin MLF® leadless package.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Portable electronics
___________________________________________________________________________________________________________
Typical Application
VI/O
MIC5314-xxYMT
MIC23031-1.8YMT
VBAT
VCORE1
DC-to-DC
Converter
VIN1
VOUT1
VIN2
VCORE2
/RST
VBIAS
VOUT2
POR2
CIN
1µF
CBIAS
1µF
EN1
EN2
CBYP
1µF
1µF
CSET2
µProcessor
10nF
GND
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
M9999-070208-A
July 2008
Micrel, Inc.
MIC5314
Ordering Information
Part Number
Manufacturing
Marking(1)
Voltage(2)
Junction Temp.
Range
Package(3)
Part Number
MIC5314-1.5/1.0YMT
MIC5314-1.5/1.1YMT
MIC5314-1.5/1.2YMT
MIC5314-1.5/1.3YMT
MIC5314-1.5/1.4YMT
MIC5314-1.5/1.5YMT
MIC5314-1.8/1.2YMT
MIC5314-FCYMT
MIC5314-F3YMT
MIC5314-F4YMT
MIC5314-F5YMT
MIC5314-F6YMT
MIC5314-FFYMT
MIC5314-G4YMT
QFRC
QFR3
QFR4
QFR5
QFR6
QFRF
QGR4
QGRG
1.5V/1.0V
1.5V/1.1V
1.5V/1.2V
1.5V/1.3V
1.5V/1.4V
1.5V/1.5V
1.8V/1.2V
1.8V/1.8V
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
12-Pin 2.5mm x 2.5mm Thin MLF®
12-Pin 2.5mm x 2.5mm Thin MLF®
12-Pin 2.5mm x 2.5mm Thin MLF®
12-Pin 2.5mm x 2.5mm Thin MLF®
12-Pin 2.5mm x 2.5mm Thin MLF®
12-Pin 2.5mm x 2.5mm Thin MLF®
12-Pin 2.5mm x 2.5mm Thin MLF®
12-Pin 2.5mm x 2.5mm Thin MLF®
MIC5314-1.8/1.8YMT MIC5314-GGYMT
Notes:
1. Pin 1 identifier = ▲.
2. For other voltage option, contact Micrel Marketing for details
3. MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
VIN1
VIN2
1
2
3
4
5
6
12 VOUT1
11 VOUT2
10 NC
VBIAS
EN1
9
8
7
CBYP
GND
EN2
CSET2
POR2
12-Pin 2.5mm × 2.5mm Thin MLF® (MT)
Pin Description
Pin Number
Pin Name
VIN1
Pin Function
1
2
3
4
Voltage Input for LDO1.
Voltage Input for LDO2.
Bias Input Voltage.
VIN2
VBIAS
EN1
Enable Input for LDO1. Active High Input. Logic High = On; Logic Low = Off; Do
not leave floating.
5
6
EN2
Enable Input for LDO2. Active High Input. Logic High = On; Logic Low = Off; Do
not leave floating.
CSET2
Delay Set Input for POR2. Connect an external capacitor to GND to set the
delay for POR2. When left open, there is no delay. Do not ground this pin.
7
8
POR2
GND
Power-on Reset for LDO2.
Ground.
9
CBYP
NC
Bypass: Connect a capacitor to ground to improve output noise and PSRR.
No Connect. Not internally connected.
Output of regulator 2.
10
11
12
VOUT2
VOUT1
Output of regulator 1.
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Micrel, Inc.
MIC5314
Absolute Maximum Ratings(1)
Operating Ratings(2)
Main Input Voltage (VIN1, VIN2)..........................0V to VBIAS
Bias Supply Voltage (VBIAS)...............................0V to +6V
Enable Input Voltage (VEN1, VEN2) ....................0V to VBIAS
POR Voltage (VPOR2)........................................0V to VBIAS
Power Dissipation ...............................Internally Limited(3)
Lead Temperature (soldering, 3sec.)......................260°C
Storage Temperature (Ts) ..................... –65°C to +150°C
ESD Rating(4)...............................................................2kV
Supply voltage (VIN1, VIN2)...........................+1.7V to VBIAS
Bias Supply Voltage (VBIAS) ........................ 2.5V to +5.5V
Enable Input Voltage (VEN1, VEN2) ...................0V to VBIAS
POR Voltage (VPOR2)........................................0V to VBIAS
Junction Temperature (TJ).....................–40°C to +125°C
Junction Thermal Resistance
2.5mm x 2.5mm Thin MLF-12 (θJA).......................70°C/W
Electrical Characteristics(4)
VBIAS = 3.6V; VIN1= VIN2 = VOUT (Highest of two regulators) + 1V; CBIAS=COUT= 1.0µF, CBYP=0.01µF, IOUT = 100µA;
TJ = 25°C, bold values indicate –40°C to + 125°C; unless noted.
Parameter
Condition
Min
–1.0
–2.0
Typ
Max
+1.0
+2.0
0.3
0.3
1.0
100
200
12
Units
%
Output Voltage Accuracy
Variation from nominal VOUT1 & VOUT2
Variation from nominal VOUT1 & VOUT2
VIN = VOUT +1V to 5.5V, VBIAS = 5.5V
VBIAS = 3.6V to 5.5V, VIN = VOUT +1V
IOUT = 100µA to 300mA
%
VIN Line Regulation
VBIAS Line Regulation
Load Regulation
0.02
0.02
0.4
40
%/V
%/V
%
Dropout Voltage
IOUT = 150mA
mV
mV
µA
IOUT = 300mA
85
Ground Pin Current VIN1,VIN2 VEN1 = High; VEN2 = Low; IOUT1 = 100µA to 300mA
VEN1 = Low; VEN2 = High; IOUT2 = 100µA to 300mA
7
7
12
µA
Ground Pin Current VBIAS
IOUT1 = IOUT2 = 100µA to 300mA
30
46
µA
Ground Pin Current in
Shutdown
VEN ≤ 0.2V
0.01
1.0
µA
VIN Ripple Rejection
f = 1kHz; COUT = 1.0µF; CBYP = 0.01µF
f = 20kHz; COUT = 1.0µF; CBYP = 0.01µF
VOUT = 0V
65
40
dB
dB
Current Limit
350
550
30
mA
Output Voltage Noise
Enable
COUT = 1µF, CBYP = 0.01µF, 10Hz to 100kHz
µVRMS
Enable Input Voltage
Logic Low
Logic High
VIL ≤ 0.2V
0.2
V
V
1.2
Enable Input Current
0.02
0.2
1
1
µA
µA
µs
VIH ≥ 1.2V
Turn-on Time
POR2 Output
VTH
COUT = 1µF; CBYP = 0.01µF
150
300
Low Threshold, % of VOUT2 (Flag ON)
High Threshold, % of VOUT2 (Flag OFF)
POR2 Output Logic Low Voltage; IL = 250µA
Flag Leakage Current, Flag OFF
88
–1
%
%
V
98
0.1
+1
VOL
0.02
0.01
IPOR2
µA
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Micrel, Inc.
MIC5314
Parameter
Condition
Min
Typ
Max
Units
CSET2 INPUT
CSET2 Pin Current Source
VCSET2 = 0V
0.8
1.4
2
µA
V
CSET2 Pin Threshold
Voltage
POR2 = High
1.212
1.25
1.288
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.
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July 2008
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Micrel, Inc.
MIC5314
Typical Characteristics
Power Supply
Power Supply
Ground Current (V )
IN
Rejection Ratio (V
)
Rejection Ratio (V
)
vs. Temperature
IN
BIAS
16
15
14
13
12
11
10
150mA
150mA
300mA
V
V
V
V
C
C
I
= V
+1V
OUT
IN
300mA
= 3.6V
= 1.5V
= 1.2V
= 1µF
BIAS
OUT1
OUT2
OUT
BYP
V
V
C
C
= V
+1V
V
V
C
C
= V
+1V
IN
OUT
IN
OUT
= 1.8V
= 1µF
= 1.8V
= 1µF
OUT
OUT
OUT
OUT
= 10nF
= 10nF
= 10nF
= I
OUT2
= 300mA
BYP
BYP
OUT1
0
0
10
100
1k
10k 100k 1M
10
100
1k
10k 100k 1M
-40 -20
0
20 40 60 80 100 120
FREQUENCY (Hz)
FREQUENCY (Hz)
TEMPERATURE (°C)
Ground Current (V
)
Ground Current (V
)
Ground Current (V )
IN
IN
BIAS
vs. Output Current
vs. Output Current
vs. Input Voltage
16.0
30
16
15
14
13
12
V
V
V
V
C
C
= V
+1V
IN
OUT
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
= 3.6V
= 1.5V
= 1.2V
= 1µF
BIAS
OUT1
OUT2
29
28
27
26
25
24
OUT
BYP
10mA
300mA
= 10nF
V
V
V
V
C
C
= V
+1V
IN
OUT
= 3.6V
= 1.5V
= 1.2V
= 1µF
V
V
V
C
C
= 3.6V
= 1.5V
= 1.2V
= 1µF
BIAS
OUT1
OUT2
BIAS
OUT1
OUT2
OUT
BYP
OUT
BYP
= 10nF
= 10nF
0
50 100 150 200 250 300
OUTPUT CURRENT (mA)
0
50 100 150 200 250 300
OUTPUT CURRENT (mA)
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Dropout Voltage
vs. Temperature
Dropout Voltage
vs. Load Current
Output Voltage
vs. Temperature
120
100
80
60
40
20
0
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
300mA
V
C
= 1.5V
= 1µF
OUT
OUT
150mA
10mA
V
V
= V
+1V
IN
OUT
= 3.6V
BIAS
V
V
C
= 3.6V
= 1.8V
= 1µF
EN = V
BIAS
IN
V
C
= 1.5V
= 1µF
OUT
OUT
OUT
OUT
-40 -20
0
20 40 60 80 100 120
0
50 100 150 200 250 300
LOAD CURRENT (mA)
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
Output Voltage
Output Voltage
Current Limit
vs. Output Current
vs. Input Voltage
vs. Input Voltage
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
650
630
610
590
570
550
530
510
490
470
450
1.8V
1.1V
V
= 5.5V
BIAS
V
V
V
= V
+1V
IN
OUT
I
= 10mA
OUT
V
V
C
= 5.5V
= 1.5V
= 1µF
= 3.6V
= 1.5V
= 1µF
BIAS
OUT
BIAS
OUT
C
C
= 1µF
= 1µF
OUT1
OUT2
C
OUT
OUT
0
50 100 150 200 250 300
OUTPUT CURRENT (mA)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
1.5
2
2.5
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
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Micrel, Inc.
MIC5314
Typical Characteristics (continued)
Output Noise
Spectral Density
1
0.1
0.01
C
C
= 1µF
= 10nF
OUT
BYP
0.001
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
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Micrel, Inc.
MIC5314
Functional Characteristics
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Micrel, Inc.
MIC5314
Functional Characteristics (continued)
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Micrel, Inc.
MIC5314
Functional Diagram
THERMAL
LIMIT
REFERENCE
CBYP
QUICK START
EN1
LDO1
VIN1
VOUT1
CSET2
CURRENT
LIMIT
VBIAS
DELAY
POR2
POR2
LDO2
EN2
VOUT2
VIN2
GND
MIC5314 Block Diagram
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Micrel, Inc.
MIC5314
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.
Application Information
The MIC5314 is a high performance, dual low input
voltage, ultra-low dropout regulator designed for
applications requiring very fast transient response. The
MIC5314 utilizes two input supplies (VIN and VBIAS),
significantly reducing the dropout voltage.
Bypass Capacitor
The MIC5314 regulator is fully protected from damage
due to fault conditions, offering linear current limiting and
thermal shutdown.
A capacitor can be placed from the bypass pin-to-ground
to reduce the 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 the bypass
capacitance. A unique, quick-start circuit allows the
MIC5314 to drive a large capacitor on the bypass pin
without significantly slowing turn-on time.
Bias Supply Voltage
VBIAS, requiring relatively light current, provides power to
the control portion of the MIC5314. Bypassing on the
bias pin is recommended to improve performance of the
regulator during line and load transients. A 1µF ceramic
capacitor from VBIAS-to-ground is recommended to help
reduce the high frequency noise from being injected into
the control circuitry.
No-Load Stability
Input Supply Voltage
Unlike many other voltage regulators, the MIC5314 will
remain stable and in regulation with no load. This is
especially important in CMOS RAM keep-alive
applications.
VIN1 and VIN2, provide the supply to power the LDOs
independently. The minimum input voltage is 1.7V
allowing conversion from low voltage supplies. The low
input voltage provides high efficiency by reducing the
input to output voltage step which minimizes the
regulator power loss.
Enable/Shutdown
The MIC5314 is provided with dual active-high enable
pins that allow each regulator to be disabled
independently. 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
Input Capacitor
The MIC5314 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.
X5R or X7R dielectrics are recommended for the input
capacitor. Y5V dielectrics lose most of their capacitance
over temperature and are therefore, not recommended.
floating;
a
floating enable pin may cause an
indeterminate state on the output.
Power On Reset
The second regulator (LDO2) provides a Power On
Reset (POR2) status pin. This pin is an open drain
output. When LDO2 is enabled an active low POR2
indicates an under voltage condition on VOUT2
.
Output Capacitor
The POR2 status signal can be programmed for a delay
(1sec/µF) by adding a capacitor from the CSET2 pin to
ground. Zero delay is added by leaving the CSET2 pin
open circuit.
The MIC5314 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 MIC5314 is designed to provide 300mA of
continuous current for both outputs in a very small
package. Maximum ambient operating temperature can
be calculated based upon the output current and the
voltage drop across the part. Given that the input voltage
is 1.8V, the output voltage is 1.5V for VOUT1, 1.0V for
VOUT2 and the output current = 300mA for each output.
The actual power dissipation of the regulator circuit can
X7R/X5R dielectric-type ceramic capacitors are
recommended
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
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Micrel, Inc.
MIC5314
be determined using the equation:
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit.
PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) I OUT2 + VBIAS 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.
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5314-FCYMT at
an input voltage of 1.8V and 300mA, loads at each
output with a minimum footprint layout, the maximum
ambient operating temperature TA can be determined as
follows:
PD = (1.8V – 1.5V) × 300mA + (1.8V – 1.0V) × 300mA
PD = 0.33W
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:
0.33W = (125°C – TA)/(70°C/W)
TA = 101.9°C
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:
⎛
⎞
TJ(MAX) − TA
⎜
⎟
PD(MAX)
=
⎜
⎝
⎟
⎠
θJA
TJ(max) = 125°C, the maximum junction temperature of
the die. The junction-to-ambient thermal resistance for
the minimum footprint, is θJA = 70°C/W.
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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Micrel, Inc.
MIC5314
MIC5314 Typical Application Circuit
U1
MIC5314-xxYMT
VIN
J7
VO1
J1
VIN
1
2
12
VIN1
VOUT1
R1
100k
VIN2
J3
3
4
VBIAS
EN1
J8
VO2
11
VBIAS
VOUT2
J4
EN1
J5
EN2
5
7
EN2
POR2
CBYP
6
CSET2
9
C3
0.01µF
C6
1µF
C5
1µF
C1
1µF
C2
1µF
C4
10nF
GND
8
J9
J2
GND
GND
Bill of Materials
Item
Part Number
C1608X5R1A105K
Manufacturer
TDK(1)
Description
Qty
4
C1, C2, C5, C6
Capacitor, 1µF Ceramic, 10V, X5R, Size 0603
Capacitor, 0.1µF, 50V, X7R, Size 0603
Capacitor, 0.01µF, 50V, X7R, Size 0603
Resistor, 100kΩ, 1%, 1/16W, Size 0603
Low Voltage Dual 300mA LDO with POR
C3
C4
R1
U1
VJ0603Y104KXACW1BC
VJ0603Y103KXACW1BC
CRCW0603100KFKEA
MIC5314-xxYMT
Vishay(2)
Vishay(2)
Vishay(2)
Micrel(3)
1
1
1
1
Notes:
1. TDK: www.tdk.com
2. Vishay: www.vishay.com
3. Micrel, Inc.: www.micrel.com
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Micrel, Inc.
MIC5314
PCB Layout Recommendations
Top Layer
Bottom Layer
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Micrel, Inc.
MIC5314
Package Information
12-Pin 2.5mm × 2.5mm 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.
© 2008 Micrel, Incorporated.
M9999-070208-A
July 2008
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