“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
☆Green Operation compatible
GENERAL DESCRIPTION
The MYRLP-F-RD/RE series is a synchronous step-down mini DC/DC converter
which integrates an inductor and a control IC in one tiny package.
It uses an ultra-low current consumption circuit and PFM control.
The control IC and coil are integrated to achieve miniaturization,
and a space-saving power supply can be configured simply by adding
two external capacitors. In addition, the ultra-low current consumption circuit
and PFM control method realize high efficiency with a light load.
A operating voltage range of 1.8V to 6.0V enables support for applications that require an internally fixed output voltage
from 0.5V to 3.60V. It has a built-in UVLO (Under Voltage Lock Out) function, the internal P-channel
MOS driver transistor and N-channel MOS driver transistor are turned OFF when input voltage is below the UVLO
detection voltage. The MYRLP-F-RD integrates CL discharge function which enables the electric charge at the
output capacitor CL to be discharged via the internal discharge switch located between the VOUT and GND.
When the devices enter stand-by mode, output voltage quickly returns to the VSS level as a result of this function.
■FEATURES
■APPLICATIONS
●
Smart meter
●
Low Power RF
●
Sensor Module
●
Wearable Devices
●
Energy Harvest devices
●
Back-up power supply circuit
Input Voltage Range
Output Voltage Setting
:
1.8V ~ 6.0V
:
0.5V ~ 3.60V
Output Voltage Accuracy
:
±20mV (VOUT≦1.0V)
±2.0% (VOUT＞1.0V)
Output Current
:
150mA
Supply Current
:
200nA @ VOUT=1.8V
Control Method
:
:
PFM control
CL Discharge
Function
● Smart card
(MYRLP-F-RD)
UVLO function
● Devices with 1 Lithium cell
Protection Functions
:
Short Protection
Input / Output Capacitor
:
Ceramic Capacitor Compatible
Operation Ambient Temperature
:
-40 ~ 85℃
Environmentally Friendly
: EU RoHS compliant, Pb Free
Halogen Free
■ TYPICAL PERFORMANCE
CHARACTERISTICS
■TYPICAL APPLICATION CIRCUIT
MYRLP-F-RD
VOUT =1.8V, CIN =10μF, CL =20μF, Ta=25℃
V IN
CIN
VCE
L1
100
90
Lｘ
80
GND
GND
70
VOUT
CE
L2
VOUT
EFFI[%]
VIN
CL
60
50
40
Vin=2.7V
30
Vin=3.6V
20
Vin=4.2V
10
< MYRLP-F-RD/RE Series >
0
0.001
0.01
1
0.1
10
100
IOUT[mA]
Export Control Code : X0863, Document No : D90DH - 00119
MYRLP-F-RD/RE series A01 Page 1 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
Series
■ BLOCK DIAGRAM
MYRLP-F-RD/RE Series
* Diodes inside the circuits are ESD protection diodes and parasitic diodes.
MYRLP-F-RE does not have CL Discharge function.
MYRLP-F-RD/RE series A01 Page 2 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ PIN CONFIGURATION
L1
7
V IN
6
1
Lx
NC
5
2
GND
CE
4
3
V O UT
8
L2
< BOTTOM VIEW >
* The dissipation pad should be solder-plated in recommended mount pattern and metal masking to enhance mounting strength and heat
release. If the pad needs to be connected to other pins, it should be connected to the GND (No.2) pin.
■ PIN ASSIGNMENT
PIN NUMBER
PIN NAME
FUNCTION
1
Lx
Switching
2
GND
Ground
3
VOUT
Output Voltage
4
CE
Chip Enable
5
GND
Ground
6
VIN
Input Voltage
7
L1
Inductor Electrodes
8
L2
Inductor Electrodes
* The NC (No.5) pin is not connected to the chip.
■FUNCTION
PIN NAME
SIGNAL
STATUS
CE
H
L
Active
Stand-by
* Please do not leave the CE pin open.
■PRODUCTION SUFFIX
MYRLP-F-RD/RE series A01 Page 3 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNITS
VIN Pin Voltage
VIN
-0.3 ~ 7.0
V
Lx Pin Voltage
VLX
-0.3 ~ VIN + 0.3 or 7.0 (*1)
V
VOUT Pin Voltage
VOUT
-0.3 ~ VIN + 0.3 or 7.0 (*1)
V
CE Pin Voltage
VCE
-0.3 ~ 7.0
V
Pd
TBD (JESD51-7board) (*2)
mW
Operating Ambient Temperature
Topr
-40 ~ 85
Storage Temperature
Tstg
-55 ~ 125
Power Dissipation
(Ta=25℃)
℃
℃
* All voltages are described based on the GND pin.
(*1) The maximum value should be either VIN+0.3V or 7.0V in the lowest.
(*2) The power dissipation figure shown is PCB mounted and is for reference only.
The mounting condition is please refer to PACKAGING INFORMATION.
MYRLP-F-RD/RE series A01 Page 4 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ ELECTRICAL CHARACTERISTICS
Ta=25℃
MYRLP-F-RD/RE Series
PARAMETER
SYMBOL
Output Voltage(*1)
VOUT
Output Voltage1-2
VOUT1-2
Operating Voltage Range
VIN
Maximum Output Current
IOUTMAX
UVLO Release Voltage
VUVLOR
UVLO Detect Voltage
VUVLOD
Quiescent Current
Iq
Stand-by Current
ISTB
PFM Switching Current
IPFM
Efficiency
EFFI
CONDITIONS
MIN.
TYP.
MAX.
UNITS
CIRCUIT
-
-
V
①
V
②
-
6.0
V
①
150
-
-
mA
①
-
1.50
1.78
V
②
1.00
1.40
-
V
②
VIN = VCE =, VOUT = VOUT×1.05
-
nA
VIN = VOUT = 6.0V
-
0.0
0.1
μA
-
400
600
mA
①
IOUT = 30mA
-
-
%
①
When connected to external components,
IOUT = 30mA
Voltage which LX pin changes “H” to “L” level while VOUT is
increase. (*5)
When connected to external components (*2)
Ta=25℃
VOUT = 0.0V , VCE = 1.8V
Voltage which Lx pin holding "H" level(*5)
Ta=25℃
VOUT = 0.0V , VCE = 1.8V
Voltage which Lx pin holding "L"
Ta=-40~85℃ (*3)
level(*5)
Ta=-40~85℃ (*3)
When connected to external components,
VIN = VOUT(T) + 2.0V, IOUT = 10mA
③
③
Lx SW ”H” ON Resistance
RLXH
VOUT = 0.0V, VIN = VCE = 5.0V, ILx = 50mA
-
0.35
0.45
Ω
④
Lx SW ”L” ON Resistance(*3)
RLXL
VIN = 5.0V
-
0.32
0.42
Ω
-
Lx SW ”H” Leakage Current
ILeakH
VIN = 6.0V , VOUT = VCE = 0.0V , VLx = 6.0V
-
0.0
0.1
μA
④
Lx SW ”L” Leakage Current
ILeakL
VIN = 6.0V , VOUT = VCE = 0.0V , VLx = 0.0V
-
0.0
0.1
μA
④
-
±100
-
1.2
-
6.0
V
②
GND
-
0.3
V
②
Output Voltage
Temperature
Characteristics
CE "H" Voltage
IOUT = 30mA
⊿VOUT/
(⊿VOUT ・ ⊿Topr )
-40℃ ≦ Topr ≦ 85℃
VCEH
VOUT = 0.0V,
Voltage which Lx pin holding “H” level(*5)
VOUT = 0.0V,
Ta=25℃
ppm/℃
①
Ta=-40~85℃ (*3)
Ta=25℃
CE "L" Voltage
VCEL
CE “H” Current
ICEH
VIN = 6.0V, VOUT = 0.0V , VCE = 6.0V
-0.1
0.0
0.1
μA
⑤
CE “L” Current
ICEL
VIN = 6.0V, VOUT = 0.0V , VCE = 0.0V
-0.1
0.0
0.1
μA
⑤
0.10
0.54
0.80
V
②
29
45
60
Ω
②
Test Frequency=1MHz
-
2.2
-
μH
ΔT=+40℃
Current value that raises the temperature by 40℃
With DC current
-
850
-
mA
Short Protection
Threshold Voltage (*4)
VSHORT
Voltage which Lx pin holding “L” level(*5)
Voltage which Lx pin holding “L” level(*5)
Ta=-40~85℃ (*3)
Ta=25℃
Ta=-40~85℃ (*3)
CL Discharge (MYRLP-F-RD)
RDCHG
Inductance Value
L
Inductor Rated Current
IDC_L
VIN = 5.0V, VCE = 0.0V, VOUT =0.1V
Unless otherwise stated, VIN=5V, VCE=5V, VOUT(T)=Nominal Value
(*1) VOUT are the average values of the output voltage considering the ripple voltage and they are set so that they can be a setting output voltage with
this evaluation condition.
(*2) The maximum output current performance varies based on a voltage difference between an input voltage and an output voltage, and external components and
so on. Regarding detail of this variation, please refer to OPERATIONAL EXPLANATION and NOTE ON USE section.
(*3) Design value
(*4) SHORT PROTECTION with LATCH is not available if VOUT1 is 1.2V or less.
(*5) "H" = VIN ~ VIN -1.2V, "L" = 0.1V ~ -0.1V
MYRLP-F-RD/RE series A01 Page 5 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ ELECTRICAL CHARACTERISTICS
SPEC Table
NOMINAL
OUTPUT
Part Number
VOLTAGE
VOUT(T)
VOUT(V)
VOUT1-2(V)
VIN(V)
Iq(nA)
TYP.
MIN.
TYP.
MAX.
VIN
TYP.
MAX.
MYRLP060015F21RD
0.60
0.600
0.560
0.580
0.600
1.80
200
600
MYRLP080015F21RD
0.80
0.800
0.760
0.780
0.800
1.80
200
600
MYRLP090015F21RD
0.90
0.900
0.860
0.880
0.900
1.80
200
600
MYRLP100015F21RD
1.00
1.000
0.960
0.980
1.000
1.80
200
600
MYRLP120015F21RD
1.20
1.200
1.156
1.180
1.204
1.80
200
600
MYRLP180015F21RD
1.80
1.800
1.744
1.780
1.816
2.30
200
600
MYRLP200015F21RD
2.00
2.000
1.940
1.980
2.020
2.50
210
630
MYRLP250015F21RD
2.50
2.500
2.430
2.480
2.530
3.00
220
660
MYRLP300015F21RD
3.00
3.000
2.920
2.980
3.040
3.50
230
690
MYRLP330015F21RD
3.30
3.300
3.214
3.280
3.346
3.80
240
720
MYRLP060015F21RE
0.60
0.600
0.560
0.580
0.600
1.80
200
600
MYRLP080015F21RE
0.80
0.800
0.760
0.780
0.800
1.80
200
600
MYRLP090015F21RE
0.90
0.900
0.860
0.880
0.900
1.80
200
600
MYRLP100015F21RE
1.00
1.000
0.960
0.980
1.000
1.80
200
600
MYRLP120015F21RE
1.20
1.200
1.156
1.180
1.204
1.80
200
600
MYRLP180015F21RE
1.80
1.800
1.744
1.780
1.816
2.30
200
600
MYRLP200015F21RE
2.00
2.000
1.940
1.980
2.020
2.50
210
630
MYRLP250015F21RE
2.50
2.500
2.430
2.480
2.530
3.00
220
660
MYRLP300015F21RE
3.00
3.000
2.920
2.980
3.040
3.50
230
690
MYRLP330015F21RE
3.30
3.300
3.214
3.280
3.346
3.80
240
720
With regard to other voltage, please contact our sales representative.
MYRLP-F-RD/RE series A01 Page 6 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ TEST CIRCUITS
< Test Circuit No.② >
< Test Circuit No.① >
Wave Form Measure Point
L
Wave Form Measure Point
L1
L1
Lx
NC
V IN
V OUT
Lx
NC
V IN
V OUT
CE
GND
I OUT
Rpulldown
V
A
CE
V
V
A
L2
CIN
※
CL
GND
※
V
External Components
CIN : 10μF
Rpulldown : 100Ω
L : 2.2μH(For test process)
CIN : 10μF
CL : 10μF
< Test Circuit No.③ >
< Test Circuit No.④ >
L1
L1
A
V
V
A
IS
CIN
※ Ext ernal Components
CIN : 10μF
V
L2
CIN
External Components
A
Lx
NC
V IN
V OUT
CE
GND
A
A
L2
CIN
※
A
Lx
NC
V IN
V OUT
CE
GND
L2
External Components
CIN : 0.1μF
MYRLP-F-RD/RE series A01 Page 7 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■
TYPICAL APPLICATION CIRCUIT
V IN
V IN
C IN
L1
Lｘ
NC
GND
CE
V OUT
V OUT
V CE
L2
CL
(NOTES):
The coil is exclusively for this product.
Please do not use it for any purpose other than this product.
【Typical Examples】
Manufacture
Product Number
CIN
Murata
GRM188R61A106ME69
CL
Murata
Size
Value
1.6 x 0.8 x 1.0mm
10μF/10V
GRM188R61A106ME69
10μF/10V
GRM188R61A226ME15
22μF/10V
1.6 x 0.8 x 1.0mm
Please select the components taking into consideration the rated voltage, rated current, and ceramic capacitor DC bias characteristics, etc.
Use a ceramic capacitor with an execution capacitance value equal to or higher than the recommended component.
If a capacitor with a low effective capacitance value is used, the output voltage may become unstable.
Please increase a capacitance value for CL in order to reduce output ripple voltages.
CL such as tantalum capacitors which have a larger ESR value can increase output ripple voltages.
If large-capacity capacitors such as electrolytic capacitors are connected in parallel, the inrush current may increase
at startup and the output voltage may become unstable.
MYRLP-F-RD/RE series A01 Page 8 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ OPERATIONAL EXPLANATION
The MYRLP-F-RD/RE series consists of a reference voltage supply, PFM comparator, Pch driver FET, Nch driver FET,
current sensing circuit, PFM control circuit, CE control circuit, and others.
< BLOCK DIAGRAM >
The efficiency performance at a light load current is significantly improved compared to existing Murata products by
implementing a current limit PFM as a control method and reducing a consumption current by IC itself.
MYRLP-F-RD/RE series A01 Page 9 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■OPERATIONAL EXPLANATION (Continued)
.
This IC controls the output voltage by adjusting the following ①~③ operation intervals in response to the output current.
The VOUT output voltage average values during actual operation depend on VOUT and the ripple voltage during actual operation
and are calculated as follows. For this reason, if the ripple voltage changes due to the influence of the input voltage, output voltage,
or peripheral components, etc., the output voltage average value will change.
VOUT = VOUT1-2 + Ripple Voltage x 1/2
①The feedback voltage (FB voltage) is the voltage that results from dividing the output voltage with the VOUT Controller logic
circuit. The PFM comparator compares this FB voltage to VREF. When the FB voltage is lower than VREF,
the PFM comparator sends a signal to the PFM control circuit to turn on the Pch driver FET.
The On Time to Pch driver FET can be obtained by the following equation.
tON = L × IPFM / (VIN - VOUT)
②When the Pch driver FET turns on, the coil current increases until the coil current reaches PFM Switching Current (IPFM).
When the coil current reaches IPFM, the Pch driver FET turns off and then the Nch driver FET turns on.
③ After the Nch driver FET turns on, the coil current will decrease and when the coil current goes down to approx. 0mA,
the Nch driver FET will turn off.
The Pch driver FET and Nch driver FET remain off until the FB voltage becomes lower than the reference voltage VREF.
The above ①~③ switching operations increase the FB voltage accompanying the output voltage increase, but if the PFM
comparator determines the FB voltage is lower than the reference voltage VREF before the coil current reaches 0mA, the Nch
driver FET turns off and the status moves to ①.
V O UT
Ripple Voltage x 1/2
V O UT1-2
Ripple
Voltage
0V
t ON
t ON
Lx
0V
I PFM
Coil
Curren t
I OUT
0mA
MYRLP-F-RD/RE series A01 Page 10 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ OPERATIONAL EXPLANATION (Continued)
< Maximum on-time function, 100% Duty operation>
When the input / output potential difference decreases, the on-time required for the coil current to reach IPFM increases,
and the output ripple voltage tends to increase. Therefore, under conditions where the input / output potential difference is small,
excessive ripple voltage is suppressed by limiting the maximum on-time that the Pch driver FET can turn on after the FB voltage
becomes higher than the reference voltage VREF to 3.0μs (TYP.).
If the input / output potential difference is further reduced, the FB voltage is always lower than the reference voltage VREF, so the
100% duty operation is performed and the Pch driver FET is always on.
At 100% duty, the current consumption of the IC increases compared to normal operation.
V OUT
Ripple Voltage x 1/2
V OUT1-2
Ripple
Voltage
0V
t ON_MAX
t ON_MAX
Lx
0V
I PFM
Coil
C urren t
I OUT
0m A
MYRLP-F-RD/RE series A01 Page 11 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■OPERATIONAL EXPLANATION (Continued)
When "H" voltage (VCEH) is fed to the CE pin, normal operation starts after raising the output voltage with Start-up Mode.
When the "L" voltage (VCEL) is fed to the CE pin, it enters the stand-by state and the current consumption is suppressed to
0.0μA (TYP.). Additionally, Pch MOS driver FET and Nch MOS driver FET are turned off.
After “H” voltage (VCEH) is fed to CE pin and UVLO function is released, by the time when FB voltage goes up to 0.9 x VREF, the
startup mode operates.
Unlike the normal operation, the start-up mode stops the operation of the short-circuit protection function and prevents the IC
from being inadvertently stopped.
In order to suppress the inrush current, the peak current of the coil is limited to 0.7 x IPFM, and the Nch driver FET does not turn
on and the coil current flows through the parasitic diode of the Nch driver FET.
The rise time of the output voltage depends on the output capacitance and output current.
Start-up Mode
(Start-up time Depend on CL,Iout)
Normal operation
St and-by
0.9 x V OUT(T)
VOUT
MYRLP-F-RE
(Fall time depends on Iout)
MYRLP-F-RD
0V
0.9 x V REF
FB
Voltage
MYRLP-F-RE
MYRLP-F-RD
0V
Coil
Current
IPF M
0.7 x IPFM
0mA
VCE
VC EH
VC EL
0V
When the VIN voltage becomes UVLO Detect Voltage (VUVLOD) or less, the UVLO function operates to forcibly turn off the Pch
MOS driver FET to prevent erroneous pulse output due to operation instability of the internal circuit.
During the UVLO function, the Pch driver FET and Nch driver FET turn off, and the Nch FET M1 between the VOUT pin and GND
pin turns on to discharge the output capacitance and make the output voltage be lower.
When the VIN voltage becomes UVLO Release Voltage (VUVLOR) or more, the UVLO function is canceled. After the UVLO function
is canceled, the output voltage rises with the startup mode, and then the normal operation is performed.
Moreover, during the UVLO operation, the current consumption increases because the internal circuit is operating and the
switching operation is stopped, not the stand-by state.
MYRLP-F-RD/RE series A01 Page 12 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ OPERATIONAL EXPLANATION (Continued)
・Case (a) : VOUT ≧1.2V
The short-circuit protection function monitors the VOUT pin voltage, and if the VOUT pin voltage drops below the Short Protection
Threshold Voltage (VSHORT) due to a short circuit or overcurrent, the short circuit protection function operates.
When the short-circuit protection function is activated, the Pch driver FET and Nch driver FET are held off. If the VOUT pin voltage
exceeds the Short Protection Threshold Voltage (VSHORT) after the short-circuit protection function is activated, normal operation
resumes.
To cancel the short-circuit protection function, it is necessary to start the IC after putting the IC in the standby state with the CE
function, or to raise the input voltage after setting the input voltage below the UVLO detection voltage (VUVLOD).
Normal operation
Short or Overcurrent
Condition
Start-up &
Normal operation
Short or Overcurrent
Condition
Start-up &
Normal operation
V OUT
VOUT (T)
VSHOR T
0V
IPF M
0.7 x I PF M
Coil
Current
0mA
RLoad
0
VCEH
VCEL
VCE
Ω
0V
Restart
VUVLOH
VUVLOD
V IN
Restart
0V
・
Case (b) : VOUT ＜1.2V
The short-circuit protection function is not implemented in the part numbers where VOUT is less than 1.2V. If a short circuit or
overcurrent occurs, the output voltage will drop and switching operation will continue.
When the short-circuit state or excessive output current is released, the output voltage rises quickly to the set output voltage.
Normal operation
VOUT
Short or Overcurrent Condition
Normal operation
VOUT (T)
VSHOR T
0V
IPF M
Coil
Curren t
0mA
RLoad
0
Ω
MYRLP-F-RD/RE series A01 Page 13 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■OPERATIONAL EXPLANATION (Continued)
< CL Discharge function (MYRLP-F-RD)>
On the MYRLP-F-RD/RE series, a CL discharge function is available as an option.
CL discharge function turns on the Nch FET M1 between the VOUT pin and GND pin when the stand-by condition in order to
discharge the output capacitance quickly and make the output voltage be lower.
This prevents malfunctioning of the application in the event that a charge remains on CL when the IC is stand-by state.
The discharge time is determined by CL and the CL discharge resistance RDCHG, including the Nch FET M1.
the discharge time of the output voltage is calculated by means of the equation below.
V = VOUT(T) × e - t / τ
t =τIn(VOUT(T) / V)
V
VOUT(T)
t
CL
RDCHG
τ
: Output voltage during discharge
: Output voltage
: Discharge time
: Effective capacitance of Output capacitor
: CL auto-discharge resistance
: CL × RDCHG
MYRLP-F-RD/RE series A01 Page 14 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ NOTE ON USE
1. Be careful not to exceed the absolute maximum ratings for externally connected components and this IC.
2. The DC/DC converter characteristics greatly depend not only on the characteristics of this IC but also on those of externally
connected components, so refer to EXTERNAL COMPONENTS SELECTION and the specifications of each component and
be careful when selecting the components. Be especially careful of the characteristics of the capacitor used for the load
capacity CL and use a capacitor with B characteristics (JIS Standard) or an X7R/X5R (EIA Standard) ceramic capacitor.
3. The CE pin and VSET pin does not have an internal pull-up or pull-down, etc. Apply the prescribed voltage to the CE pin and
VSET pin.
If an intermediate voltage is fed to the CE and VSET pins, a through current will flow through the input stage of the CE and
VSET pins, increasing current consumption.
4. At light loads or when IC operation is stopped, leakage current from the Pch driver FET may cause the output voltage to rise.
5. Switching operation may be performed continuously due to internal delay or input offset of the PFM comparator circuit.
If the switching operation continues, the output ripple voltage increases and the output voltage rises as the ripple voltage
increases.
6. When the input / output potential difference is small, the ripple voltage increases and the output voltage may increase.
7. Since the short-circuit protection function is not implemented in the part number where both of or either VOUT is less than 1.2V,
the coil current may be superposed under the condition of high input voltage and excessive output current.
8. During start-up mode, the peak current of the coil is set lower than in normal operation, so the output voltage may not rise under
conditions where the output current is large during start-up.
9. To suppress current consumption, UVLO detection is performed only for a certain period after the Pch driver FET is turned on.
For this reason, the UVLO function may not operate if the VIN pin voltage instantaneously drops below the UVLO detection
voltage (VUVLOD).
10. For temporary, transitional voltage drop or voltage rising phenomenon, the IC is liable to malfunction should the ratings be
exceeded.
11. Murata places an importance on improving our products and their reliability. We request that users incorporate fail-safe
designs and post-aging protection treatment when using Murata products in their systems.
MYRLP-F-RD/RE series A01 Page 15 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■NOTE ON USE (Continued)
12. Instructions of pattern layouts
(1)In order to stabilize VIN voltage level, we recommend that a by-pass capacitor (CIN) be connected as close as possible to
the VIN & GND pins.
(2) Please mount each external component as close to the IC as possible.
(3) Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit
impedance.
(4) Make sure that the PCB GND traces are as thick as possible, as variations in ground potential caused by high ground
currents at the time of switching may result in instability of the IC.
(5) This series’ internal driver FET bring on heat because of the output current and ON resistance of Pch driver FET.
< Reference pattern layout >
Layer 1
Layer 2
Layer 3
Layer 4
MYRLP-F-RD/RE series A01 Page 16 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ Notes on handling of product
(1) The coil mounted on this product complies with the general surface mount type chip inductor specifications, and may have
scratches, flux stains, etc.
(2) Do not use this product in the following environments. Places exposed to water or salt water, places where condensation
occurs, places where toxic gases (hydrogen sulfide, zinc acid, chlorine, ammonia, etc.) are present.
(3) Please do not wash this product with solvent.
■ Notes on mounting
(1) Please set the mounting position accuracy within 0.05 mm.
MYRLP-F-RD/RE series A01 Page 17 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ TYPICAL PERFORMANCE CHARACTERISTICS
(1) Efficiency vs. Output Current
MYRLP-F-RD/RE (VOUT=3.0V)
100
100
90
90
80
80
70
60
VIN = 4.2V
50
VIN = 3.6V
40
VIN = 2.7V
30
20
Efficiency: EFFI (%)
Efficiency: EFFI (%)
MYRLP-F-RD/RE (VOUT=1.8V)
60
VIN = 5.0V
50
VIN = 4.2V
40
30
20
10
10
0
0.001
70
0.01
0.1
1
10
0
0.001
100
0.01
0.1
1
10
100
Output Current: IOUT (mA)
Output Current: IOUT (mA)
MYRLP-F-RD/RE (VOUT=3.0V)
Efficiency: EFFI (%)
Efficiency: EFFI (%)
MYRLP-F-RD/RE (VOUT=1.8V)
MYRLP-F-RD/RE (VOUT=1.8V)
MYRLP-F-RD/RE (VOUT=3.0V)
Efficiency: EFFI (%)
Output Current: IOUT (mA)
Efficiency: EFFI (%)
Output Current: IOUT (mA)
Output Current: IOUT (mA)
Output Current: IOUT (mA)
MYRLP-F-RD/RE series A01 Page 18 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(2) Output Voltage vs. Output Current
MYRLP-F-RD/RE (VOUT=1.8V)
MYRLP-F-RD/RE (VOUT=3.0V)
2.00
VIN = 4.2V
VIN = 3.6V
1.90
Output Voltage: VOUT (V)
Output Voltage: VOUT (V)
1.95
VIN = 2.7V
1.85
1.80
1.75
1.70
1.65
1.60
0.001
0.01
0.1
1
10
3.30
3.25
3.20
3.15
3.10
VIN = 4.2V
3.05
3.00
2.95
2.90
2.85
2.80
2.75
2.70
0.001
100
VIN = 5.0V
0.01
Output Current: IOUT (mA)
0.1
1
10
100
Output Current: IOUT (mA)
(3) Ripple Voltage vs. Output Current
MYRLP-F-RD/RE (VOUT=1.8V)
MYRLP-F-RD/RE (VOUT=3.0V)
100
90
VIN = 4.2V
90
VIN = 5.0V
80
VIN = 3.6V
80
VIN = 4.2V
70
VIN = 2.7V
Ripple Voltage: Vr (mV)
Ripple Voltage: Vr (mV)
100
60
50
40
30
20
10
0
70
60
50
40
30
20
10
1
0.1
10
0
100
1
0.1
Output Current: IOUT (mA)
(5) UVLO Voltage vs. Ambient Temperature
MYRLP-F-RD/RE (VOUT=1.8V)
MYRLP-F-RD/RE
IOUT = 30mA
1.8
UVLO Voltage (V)
Output Voltage: VOUT (V)
100
Output Current: IOUT (mA)
(4) Output Voltage vs. Ambient Temperature
1.90
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
1.72
1.70
10
1.7
UVLO Release Voltage
1.6
UVLO Detect Voltage
1.5
1.4
1.3
1.2
1.1
1.0
-50
-25
0
25
50
Ambient Temperature: Ta (℃)
75
100
-50
-25
0
25
50
75
100
Ambient Temperature: Ta (℃)
MYRLP-F-RD/RE series A01 Page 19 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(6) Quiescent Current vs. Ambient Temperature
(7) Stand-by Current vs. Ambient Temperature
MYRLP-F-RD/RE
1.0
500
450
400
VIN=4.2V
0.8
VIN=3.6V
350
300
250
Standby Current: ISTB
(μA )
Quiescent Current: Iq (nA)
MYRLP-F-RD/RE (VOUT=0.6V)
VIN=1.8V
200
150
100
50
0
-50
-25
0
25
50
75
0.6
0.4
0.2
0.0
100
VIN = 6.0V
-50
-25
Ambient Temperature: Ta (℃)
0
(8) PFM Switching Current vs. Ambient Temperature
300
200
100
-50
-25
0
25
50
75
VIN = 3.6V
0.8
VIN = 1.8V
0.6
0.4
0.2
0.0
100
VIN = 5.0V
1.0
-50
-25
(10) CE ”L” Voltage vs. Ambient Temperature
VIN = 3.6V
VIN = 1.8V
0.6
0.4
0.2
-25
0
25
50
Ambient Temperature: Ta (℃)
75
100
Short Protection Threshold Voltage : VSHORT (V)
CE ”L” Voltage : VCEL (V)
VIN = 5.0V
-50
50
75
100
MYRLP-F-RD/RE (VOUT=0.6V)
1.2
0.0
25
(11) Short Protection Threshold vs. Ambient Temperature
MYRLP-F-RD/RE
0.8
0
Ambient Temperature: Ta (℃)
Ambient Temperature: Ta (℃)
1.0
100
1.2
CE ”H” Voltage : VCEH (V)
PFM Switching Current: IPFM (mA)
V IN = 5.0V
400
0
75
MYRLP-F-RD/RE
IOUT = 30mA
500
50
(9) CE ”H” Voltage vs. Ambient Temperature
MYRLP-F-RD/RE (VOUT=0.6V)
600
25
Ambient Temperature: Ta (℃)
1.4
VIN = 5.0V
1.2
VIN = 3.6V
1.0
VIN = 1.8V
0.8
0.6
0.4
0.2
0.0
-50
-25
0
25
50
75
100
Ambient Temperature: Ta (℃)
MYRLP-F-RD/RE series A01 Page 20 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
MYRLP-F-RD/RE
MYRLP-F-RD
MYRLP-F-RD
MYRLP-F-RD
MYRLP-F-RD
MYRLP-F-RD/RE series A01 Page 21 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
MYRLP-F-RD
MYRLP-F-RD
MYRLP-F-RD/RE series A01 Page 22 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ PACKAGING INFORMATION
●Packaging (2.0mm×2.5mm, h=1.0mm)
(unit: mm)
■外部リード処理
Terminal material : Copper foil
Terminal plating : 1～6 Gold plating
7～8 Lead(Pb) free Solder plating
●Reference Pattern Layout (unit:mm)
●Reference Metal Mask Design (unit:mm)
2.9
0.4
1.3
2.85
0.5
0.4
0.5
1.2
0.3
2.2
2.05
0.8
2.25
0.4 0.4 0.4
0.3
0.375
0.9
2.1
0.3
0.375
0.35
0.55 0.55
0.55 0.55
0.4
2.1
0.4
0.325
2.2
0.325
*Please use the above mount pad dimensions and metal mask design as reference data.
MYRLP-F-RD/RE series A01 Page 23 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ PACKAGING INFORMATION
Power Dissipation
Power dissipation data for the package is shown in this page.
The value of power dissipation varies with the mount board conditions.
Please use this data as one of reference data taken in the described condition.
1. Measurement Condition (Reference data)
Condition: Mount on a board
Ambient: Natural convection
Soldering: Lead (Pb) free
Board Dimensions:
40 x 40 mm (1600mm2 in one side)
Copper (Cu) traces occupy 50% of the board area
In top and back faces Package heat-sink is tied to
the copper traces
Material:
Glass Epoxy (FR-4)
Thickness:
1.6 mm
Through-hole:
4 x 0.8 Diameter
Copper foil thickness: Front 35um, Back 35um
Evaluation Board (Unit:mm)
2.
Power Dissipation vs. Ambient Temperature
Board Mount ( Tjmax=125℃)
Power Dissipation Pd (mW)
Ambient Temperature
(℃)
Ta max=85℃
Ta max=105℃
25
800
800
85
320
320
105
0
160
125
0
0
Thermal Resistance (℃/W）
125.00
MYRLP-F-RD/RE series A01 Page 24 of 26
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
■ MARKING RULE
Mark①represents product series.
1
①
②
③
3
PRODUCT SERIES
A
MYRLP***015F21RD / MYRLP***015F21RE
6
④ ⑤
2
MARK
5
4
Mark②,③ represents the registered setting, output voltage.
MARK
OUTPUT
PRODUCT
VOLTAGE(V)
SERIES
E
0.50～3.60V
MYRLP***015F21RE
D
0.50～3.60V
MYRLP***015F21RD
Type
15
Mark ④ ⑤ ,represents production lot number
01～09、0A～0Z、11～9Z、A1～A9、AA～ZZ、B1～ZZ in order.
(G, I, J, O, Q, W excluded) * No character inversion used.
MYRLP-F-RD/RE series A01 Page 25 of 25
“PicoBK™” MYRLP-F-RD/RE series
Ultra-Low Quiescent Current, Inductor Built-in Step-Down DC/DC Converter
1.
The product and product specifications contained herein are subject to change without notice to
improve performance characteristics. Consult us, or our representatives before use, to confirm
that the information in this datasheet is up to date.
2.
The information in this datasheet is intended to illustrate the operation and characteristics of our
products. We neither make warranties or representations with respect to the accuracy or
completeness of the information contained in this datasheet nor grant any license to any
intellectual property rights of ours or any third party concerning with the information in this
datasheet.
3.
Applicable export control laws and regulations should be complied and the procedures required
by such laws and regulations should also be followed, when the product or any information
contained in this datasheet is exported.
4.
The product is neither intended nor warranted for use in equipment of systems which require
extremely high levels of quality and/or reliability and/or a malfunction or failure which may cause
loss of human life, bodily injury, serious property damage including but not limited to devices or
equipment used in 1) nuclear facilities, 2) aerospace industry, 3) medical facilities, 4) automobile
industry and other transportation industry and 5) safety devices and safety equipment to control
combustions and explosions. Do not use the product for the above use unless agreed by us in
writing in advance.
5.
Although we make continuous efforts to improve the quality and reliability of our products;
nevertheless Semiconductors are likely to fail with a certain probability. So in order to prevent
personal injury and/or property damage resulting from such failure, customers are required to
incorporate adequate safety measures in their designs, such as system fail safes, redundancy
and fire prevention features.
6.
Our products are not designed to be Radiation-resistant.
7.
Please use the product listed in this datasheet within the specified ranges.
8.
We assume no responsibility for damage or loss due to abnormal use.
9.
All rights reserved. No part of this datasheet may be copied or reproduced unless agreed by
Murata Manufacturing Co., Ltd in writing in advance.
Murata Manufacturing Co., Ltd
MYRLP-F-RD/RE series A01 Page 26 of 26
