MICREL MIC5315

MIC5315
Low Voltage Dual 300mA LDO
with Voltage Select
General Description
Features
The MIC5315 is a high performance, dual low input
voltage, low dropout regulator with voltage select. Major
features include two 300mA LDOs, input voltage down to
1.7V, ultra low drop out of 85mV at full load, and voltage
select. 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. Voltage select is incorporated into the second output,
which reduces the output voltage to a lower level to further
save power while in stand-by mode.
Ideal for battery operated applications; the MIC5315 offers
1% accuracy and low ground current to increase light load
efficiency. The MIC5315 can also be put into a zero-offmode current state, drawing virtually no current when
disabled.
The MIC5315 is available in fixed output voltages in the
10-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.
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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
Voltage select function
Stable with 1µF ceramic output capacitors
Very fast transient response
Thermal shutdown and current limit protection
Tiny 10-pin 2mm x 2mm Thin MLF® package
Applications
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Mobile Phones
GPS and Navigation Devices
Portable Media Players
Digital still and video cameras
PDAs
Portable electronics
___________________________________________________________________________________________________________
Typical Application
VI/O
MIC5315-xxyYMT
MIC23031-1.8YMT
DC-to-DC
Converter
VBAT
VIN1
VOUT1
VCORE1
VOUT2
VCORE2
VIN2
VBIAS
CIN
1µF
CBIAS
1µF
/VSC2
EN1
CBYP
1µF
1µF
EN2
GND
10nF
µProcessor
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
July 2008
M9999-070208-A
Micrel, Inc.
MIC5315
Ordering Information
Part Number
Manufacturing
Part Number
Marking(1)
VOUT1(2)
VOUT2(2)
Junction
Temp. Range
Package(3)
MIC5315-1.5/1.2/1.0YMT
MIC5315-F4CYMT
F4C
1.5V
1.2V/1.0V
–40°C to +125°C
10-Pin 2mm x 2mm
Thin MLF®
MIC5315-1.5/1.3/1.0YMT
MIC5315-F5CYMT
F5C
1.5V
1.3V/1.0V
–40°C to +125°C
10-Pin 2mm x 2mm
Thin MLF®
MIC5315-1.8/1.6/1.1YMT
MIC5315-GW3YMT
GW3
1.8V
1.6V/1.1V
–40°C to +125°C
10-Pin 2mm x 2mm
Thin MLF®
MIC5315-1.8/1.8/1.0YMT
MIC5315-GGCYMT
GGC
1.8V
1.8V/1.0V
–40°C to +125°C
10-Pin 2mm x 2mm
Thin MLF®
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
1
10 VOUT1
VIN2
2
9
VOUT2
VBIAS
3
8
/VSC2
EN1
4
7
CBYP
EN2
5
6
GND
®
10-Pin 2mm × 2mm Thin MLF (MT)
Pin Description
Pin Number
Pin Name
1
VIN1
Voltage Input for LDO1.
2
VIN2
Voltage Input for LDO2.
3
VBIAS
4
EN1
Enable Input for LDO1. Active High Input. Logic High = On; Logic Low = Off; Do
not leave floating.
5
EN2
Enable Input for LDO2. Active High Input. Logic High = On; Logic Low = Off; Do
not leave floating.
6
GND
Ground.
7
CBYP
Bypass: Connect a capacitor to ground to improve output noise and PSRR.
8
/VSC2
Voltage Select Input for LDO2. Active Low Input. Logic High = Full Output
Voltage; Logic Low = Low Output Voltage. Do not leave floating.
9
VOUT2
Output of regulator 2.
10
VOUT1
Output of regulator 1.
July 2008
Pin Function
Bias Input Voltage.
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M9999-070208-A
Micrel, Inc.
MIC5315
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
Voltage Select Input Voltage (V/VSC2) ...............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
Voltage Select Input Voltage (V/VSC2)............... 0V to VBIAS
Junction Temperature (TJ) .....................–40°C to +125°C
Junction Thermal Resistance
2mm x 2mm Thin MLF-10 (θJA).............................80°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 = 25ºC, bold values indicate –40ºC to + 125ºC; unless noted.
Parameter
Condition
Min
Output Voltage Accuracy
Variation from nominal VOUT1 & VOUT2
Select Mode Output Voltage
Accuracy
Typ
Max
Units
–1.0
+1.0
%
Variation from nominal VOUT1 & VOUT2
–2.0
+2.0
%
VOUT2, V/VSC2 = Logic Low
-3.0
+3.0
%
VOUT2, V/VSC2 = Logic Low
-4.0
+4.0
%
VIN Line Regulation
VIN = VOUT +1V to 5.5V, VBIAS = 5.5V
0.02
0.3
%/V
VBIAS Line Regulation
VBIAS = 3.6V to 5.5V, VIN = VOUT +1V
0.02
0.3
%/V
Load Regulation
IOUT = 100µA to 300mA
0.4
1.0
%
Dropout Voltage
IOUT = 150mA
40
100
mV
IOUT = 300mA
85
200
mV
VEN1 = High; VEN2 = Low; IOUT1 = 100µA to 300mA
7
12
µA
VEN1 = Low; VEN2 = High; IOUT2 = 100µA to 300mA
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
65
dB
f = 20kHz; COUT = 1.0µF; CBYP = 0.01µF
40
dB
550
mA
30
µVRMS
Ground Pin Current VIN1,VIN2
Current Limit
VOUT = 0V
350
Output Voltage Noise
COUT=1µF, CBYP=0.01µF, 10Hz to 100kHz
Enable
Enable Input Voltage
Logic Low
0.2
Logic High
Enable Input Current
Turn-on Time
July 2008
V
V
1.2
VIL ≤ 0.2V
0.02
1
µA
VIH ≥ 1.2V
0.2
1
µA
COUT = 1µF; CBYP = 0.01µF
150
300
µs
3
M9999-070208-A
Micrel, Inc.
MIC5315
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.
July 2008
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M9999-070208-A
Micrel, Inc.
MIC5315
Typical Characteristics
Power Supply
Rejection Ratio (V IN)
Power Supply
Rejection Ratio (V BIAS)
150mA
16
150mA
Ground Current (V IN)
vs. Temperature
15
14
300mA
13 VIN = VOUT +1V
300mA
VIN = VOUT +1V
VOUT = 1.8V
COUT = 1µF
CBYP = 10nF
VIN = VOUT +1V
VOUT = 1.8V
COUT = 1µF
CBYP = 10nF
0
10
16.0
100
1k
10k 100k
FREQUENCY (Hz)
1M
Ground Current (V IN)
vs. Output Current
VIN = VOUT +1V
VBIAS = 3.6V
VOUT1 = 1.5V
VOUT2 = 1.2V
COUT = 1µF
CBYP = 10nF
15.5
15.0
14.5
14.0
13.5
0
10
30
120
100
Dropout Voltage
vs. Temperature
80
40
VOUT = 1.5V
COUT = 1µF
150mA
27
24
0
0.10
0.09
10mA
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Output Voltage
vs. Output Current
1.65
0
0
2.0
1.8
1.0
0.8
July 2008
50 100 150 200 250 300
OUTPUT CURRENT (mA)
Ground Current (V IN)
vs. Input Voltage
300mA
10mA
VBIAS = 3.6V
VOUT1 = 1.5V
VOUT2 = 1.2V
COUT = 1µF
CBYP = 10nF
12
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
1.70
Output Voltage
vs. Temperature
1.65
1.60
1.50
VBIAS = 3.6V
VOUT = 1.8V
COUT = 1µF
0.02
0.01
1.2
1.30
0
Dropout Voltage
vs. Load Current
13
1.45
1.50
1.35
50 100 150 200 250 300
OUTPUT CURRENT (mA)
14
0.05
0.04
1.55
VIN = VOUT +1V
VBIAS = 3.6V
VOUT = 1.5V
COUT = 1µF
16
1.55
1.6
1.4
1.40
10
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0.07
0.06
1.60
1.45
VIN = VOUT +1V
VBIAS = 3.6V
VOUT1 = 1.5V
VOUT2 = 1.2V
COUT = 1µF
CBYP = 10nF
0.03
20
1.70
Ground Current (V BIAS)
vs. Output Current
0.08
300mA
60
1M
15
25
50 100 150 200 250 300
OUTPUT CURRENT (mA)
IOUT1 = IOUT2 = 300mA
100
1k
10k 100k
FREQUENCY (Hz)
28
26
12.5
VOUT2 = 1.2V
COUT = 1µF
11 C
BYP = 10nF
29
13.0
12.0
0
VBIAS = 3.6V
12 VOUT1 = 1.5V
50 100 150 200 250 300
LOAD CURRENT (mA)
Output Voltage
vs. Input Voltage
1.8V
1.1V
1.40
1.35
VIN = VOUT +1V
VBIAS = 3.6V
EN = VIN
VOUT = 1.5V
COUT = 1µF
1.30
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
650
630
Current Limit
vs. Input Voltage
610
590
570
550
530
VBIAS = 5.5V
IOUT = 10mA
COUT1 = 1µF
COUT2 = 1µF
0.6
0.4
0.2
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
5
510
490
VBIAS = 5.5V
VOUT = 1.5V
COUT = 1µF
470
450
1.5 2 2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
M9999-070208-A
Micrel, Inc.
MIC5315
Typical Characteristics (continued)
1
Output Noise
Spectral Density
0.1
0.01
COUT = 1µF
CBYP = 10nF
0.001
10
July 2008
100
1k
10k 100k
FREQUENCY (Hz)
1M
6
M9999-070208-A
Micrel, Inc.
MIC5315
Functional Characteristics
July 2008
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M9999-070208-A
Micrel, Inc.
MIC5315
Functional Diagram
THERMAL
LIMIT
REFERENCE
QUICK START
CBYP
EN1
VIN1
VBIAS
EN2
VIN2
LDO1
VOUT1
CURRENT
LIMIT
VOUT2
/VSC2
LDO2
GND
MIC5315 Block Diagram
July 2008
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M9999-070208-A
Micrel, Inc.
MIC5315
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 MIC5315 is a high performance, dual low input
voltage, ultra-low dropout regulator designed for low
applications requiring very fast transient response. The
MIC5315 utilizes two input supplies (VIN and VBIAS),
significantly reducing the dropout voltage.
The MIC5315 regulator is fully protected from damage
due to fault conditions, offering linear current limiting and
thermal shutdown.
Bypass Capacitor
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
MIC5315 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 MIC5315. 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
Unlike many other voltage regulators, the MIC5315 will
remain stable and in regulation with no load. This is
especially important in CMOS RAM keep-alive
applications.
Input Supply Voltage
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 MIC5315 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
floating; a floating enable pin may cause an
indeterminate state on the output.
Input Capacitor
The MIC5315 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 highfrequency 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.
Voltage Select
The MIC5315 incorporates voltage select technology to
set LDO2’s voltage output to a preset lower level. The
/VSC2 pin is an active low input. A logic high signal sets
VOUT2 to the full output voltage; while a logic low signal
sets VOUT2 to the lower output voltage.
Output Capacitor
The MIC5315 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.
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
July 2008
Thermal Considerations
The MIC5315 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
be determined using the equation:
PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) I OUT2 + VBIAS IGND
Because this device is CMOS and the ground current is
9
M9999-070208-A
Micrel, Inc.
MIC5315
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 – 1.5V) × 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:
⎛ TJ(MAX) − TA
PD(MAX) = ⎜
⎜
θ JA
⎝
The maximum power dissipation must not be exceeded
for proper operation.
For example, when operating the MIC5315-F5CYMT 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:
0.33W = (125°C – TA)/(80°C/W)
TA = 98.6°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:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
⎞
⎟
⎟
⎠
TJ(max) = 125°C, the maximum junction temperature of
the die. The junction-to-ambient thermal resistance for
the minimum footprint, is θJA = 80°C/W.
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum operating
conditions for the regulator circuit.
July 2008
10
M9999-070208-A
Micrel, Inc.
MIC5315
MIC5315 Typical Application Circuit
U1
MIC5315-xxyYMT
VIN
J1
VIN
J3
VBIAS
J4
EN1
J5
EN2
C1
1µF
C2
1µF
1
VIN1
2
VIN2
3
VBIAS
4
EN1
5
EN2
7
CBYP
C3
10nF
GND
6
J2
GND
VOUT1
10
J7
VO1
VOUT2
9
J8
VO2
/VSC2
8
J10
VSC
C5
1µF
C4
1µF
J9
GND
Bill of Materials
Item
Part Number
Manufacturer
Description
(1)
TDK
Qty
C1, C2, C4, C5
C1608X5R1A105K
Capacitor, 1µF Ceramic, 10V, X5R, Size 0603
4
C3
VJ0603Y103KXACW1BC
Vishay(2)
Capacitor, 0.01µF, 50V, X7R, Size 0603
1
U1
MIC5315-xxyYMT
Micrel(3)
Low Voltage Dual 300mA LDO with VSCALE
1
Notes:
1.
TDK: www.tdk.com
2.
Vishay: www.vishay.com
3.
Micrel, Inc.: www.micrel.com
July 2008
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M9999-070208-A
Micrel, Inc.
MIC5315
PCB Layout Recommendations
Top Layer
Bottom Layer
July 2008
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M9999-070208-A
Micrel, Inc.
MIC5315
Package Information
®
10-Pin 2mm × 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.
© 2008 Micrel, Incorporated.
July 2008
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M9999-070208-A