MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch ... · MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series 2ch Synchronous Step-down DC/DC

• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.

MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series

2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOODMonolithic IC MM3558 Series

Outline

This IC is a compound power supply IC which built in Synchronous Step-down DC/DC converter 2ch, LDO1ch, and P-GOOD2ch.The ripple of the input current is decreased so that the DC/DC converter of 2ch may work by the opposite phase, and a low noise is achieved. Because the output voltage can be set by external resistance, it is possible to use it according to various output conditions.

Features

1. Input Operating Voltage Range 3.0V~5.5V2. Shutdown Supply Current 0.1µA (Typ.)3. Temperature Range −30~+85°C4. DC/DC converters Output Voltage 1.0V~PVIN Accuracy ±2% Maximum Output Current 1.5A / 1ch Oscillator Frequency 2MHz (Typ.) Output Voltage is changeable in external parts. Built-in start/stop sequence circuit. Output OverVoltage Protection function 0.72V (Typ.) Built-in SoftStart circuit 1.5ms (Typ.) Built-in OverCurrent detection timer 1.5ms (Typ.)5. LDO Output Voltage 3.3V Accuracy ±1% Dropout voltage 0.10V (Typ.) Current limit 40mA (Typ.) 6. P-GOOD Input/Output Over Voltage/Low Voltage, Over Current, and Thermal detection.

Package

SQFN-16A

Applications

1. Printer2. Composit device



Block Diagram

Discharge Tr

PVOUT3 P_GOOD2

P_GOOD1

PGND2

SW2

PVIN2

FB2

PGND1

SW1

PVIN1

FB1

EN23

EN1

AGND

AVIN

AVIN

AVIN

Vref

CurrentLimit

SoftStart

SoftStart

ControlLogic

ControlLogic

CurrentLimit COMP

CurrentLimit COMP

CurrentSense AMP

CurrentSense AMP

1.5msTimer

2MHzRamp

Generator

TSD

OVP_OUT(FB1/FB2)

OVP_IN

UVLO

VREF

SW1Current Limit

OSC1

ErrorAMP

ErrorAMP

PWMCOMP

PWMCOMP

OSC2

OSC2

OSC1

SW2Current Limit

AVINP_GOOD

Detect

FB1P_GOOD

Detect

FB2P_GOOD

Detect

P_GOOD2Controler

P_GOOD1Controler

Discharge Tr



Pin Assignment

1 2 3 4

5

6

7

8

16

15

14

13

9101112

SQFN-16A(TOP VIEW)

1 P_GOOD2 9 PGND22 EN1 10 SW23 SW1 11 EN234 PGND1 12 P_GOOD15 FB1 13 PVIN26 TP 14 AVIN7 PVOUT3 15 AGND8 FB2 16 PVIN1



Pin Description

Pin No. Pin name Pin description Internal equivalent circuit diagram

1

12

P_GOOD2P_GOOD1

Power Good output pin

PGND

2

11

EN1EN23

Enable pin for ON/OFF

AVIN

AGND

3

10

SW1SW2

Power switched pin

Discharge TrSW2 Only

PVIN

PGND

4

9

15

PGND1PGND2AGND

Ground pin

AGND

PGND

5

8

FB1FB2

DC/DC output voltage

feedback pin

AGND

AVIN

Err Amp

6 TPTest pin

(Please connect with GND.)

AGND

AVIN



Pin No. Pin name Pin description Internal equivalent circuit diagram

7 PVOUT3 Regulator output pin

AGNDPGND

AVIN

13

16

PVIN2PVIN1

Power supply input pin

PGND

PVIN

IntenalCircuit

SW

14 AVIN Power supply input pin

AGND

AVIN

IntenalCircuit



Absolute Maximum Ratings (Except where noted otherwise Ta=25°C)

Note1 : The values indicate reference values.

Item Symbol Ratings UnitsAVIN Voltage VAVIN −0.3~+6.0 V

PVIN1 Voltage VPVIN1 −0.3~+6.0 VPVIN2 Voltage VPVIN2 −0.3~+6.0 VSW1 Voltage VSW1 −0.6~VPVIN1+0.3 VSW2 Voltage VSW2 −0.6~VPVIN2+0.3 VFB1 Voltage VFB1 −0.3~+6.0 VFB2 Voltage VFB2 −0.3~+6.0 V

P_GOOD1 Voltage VPG1 −0.3~+6.0 VP_GOOD2 Voltage VPG2 −0.3~+6.0 V

EN1 Voltage VEN1 −0.3~+6.0 VEN23 Voltage VEN23 −0.3~+6.0 V

PVOUT3 Voltage VPVO3 −0.3~VAVIN+0.3 VSW1 Maximum Current ISW1 1.8 ASW2 Maximum Current ISW2 1.8 A

P_GOOD1 Maximum Current IPG1 200 mAP_GOOD2 Maximum Current IPG2 200 mAPVOUT3 Maximum Current IPVO3 50 mA

Storage Temperature TSTG −55~+150 °CPower Dissipation (Alone) PD 220 (Note1) mW

Recommended Operating Conditions (Except where noted otherwise Ta=25°C)

Item Symbol Ratings UnitsAVIN Voltage VAVIN 3.0~5.5 V

PVIN1 Voltage VPVIN1 3.0~5.5 VPVIN2 Voltage VPVIN2 3.0~5.5 VSW1 Current ISW1 0~1.5 ASW2 Current ISW2 0~1.5 A

DC/DC Converter Output Voltage (Note2) VDCO 1.0~PVIN VPVOUT3 Current IPVO3 0~10 mA

Operating Temperature TOPR -30~+85 °CJunction Temperature (Note3) TJ 150 °C

Note2 : There is a case to take operation from 1 to 2 when applying to the following condition in addition to the thing without the voltage difference between the input and the output. · Duty 90% or more · Hiside Tr ON resistance × load current > voltage difference between the input and the output 1) If Duty becomes 100%, the output voltage decreases depending on "Input voltage- Hiside Tr ON resistance × load current". 2) There is a case that becomes operation that the switching operates at a cycle different from the oscillatory frequency that looks like the abnormally oscillation.Note3 : Please calculate TJ from ambient temperature TA and power consumption Preferring to the next expression. TJ = TA + P × 62.2 °C/W Thermal resistance 62.2 °C/W is a value when the substrate size mounts on two glass epoxy layer substrate of 90×90×1.6mm3 (copper interconnect rate 90%).



Electrical Characteristics (Except where noted otherwise AVIN=PVIN1=PVIN2=5.0V, EN1=EN23=5.0V, Ta=25°C)

Item Symbol Measurement conditions Min. Typ. Max. UnitsMeasuringCircuit No.

Supply Current1 (DCDC1) IDD1EN1=5V, EN23=0V

FB1=0.65V350 525 µA 2

Supply Current2(DCDC2, PVOUT3)

IDD2EN1=0V, EN23=5V

FB2=0.65V400 600 µA 2

Supply Current(No switching)

IDD3FB1=FB2=0.55V

PVOUT3=No Load600 900 µA 2

Shutdown Current IOFF EN1=EN23=0V 0.1 1.0 µA 2

VIN UVLO Detection Voltage VUVLOD AVIN=4.5V 0V 2.45 2.55 2.65 V 2

VIN UVLO Release Voltage VUVLOR AVIN=0V 4.5VVUVLOD

+100VUVLOD

+150VUVLOD

+200 mV 2

OVP_IN Detection Voltage VOVPID AVIN=5.0V 6.0V 5.6 5.8 6.0 V 2

OVP_IN Release Voltage VOVPIR AVIN=6.0V 5.0VVOVPID

-150 mV 2

OVP_OUT Detection Voltage VOVPOD FB1(FB2)=0.6 0.8V 0.66 0.72 0.76 V 2

OVP_OUT Release Voltage VOVPOR FB1(FB2)=0.8 0.6VVOVPOD

-25 mV 2

EN1, EN23 pin "High"Input Voltage

VENH AVIN/2 V 2

EN1, EN23 pin "Low"Input Voltage

VENL 0.5 V 2

EN1, EN23 Pin Input Current IEN EN=6V 2 µA 2

Thermal Shutdown Detection VTHD No switching 150 °C

Thermal Shutdown Release VTHR No switching 120 °C

DC/DC converter

FB1, 2 Voltage VFBPWMVOUT=1.8V

L=2.7µH, COUT=22µF0.588 0.600 0.612 V 1

FB1, 2 Pin Current IFB FB1=FB2=6V -1.0 +1.0 µA 2

Oscillator Frequency fOSC 1.8 2.0 2.2 MHz 1

Hiside Tr Current Limit (Note4) ILIMSW 1.7 3.0 A 1

Hiside Tr ON Resistance RSWH SW1(SW2)=100mA sink 0.3 0.6 2

Lowside Tr ON Resistance RSWL SW1(SW2)=100mA source 0.25 0.5 2

Soft Start Time tSS Time till it reaches to FB×0.9 0.5 1.5 2.5 ms 1

SW2 Pin Discharge TrON Resistance

RDSW2EN23=0VSW2=5.0V

100 2

Note4 : The parameter is guaranteed by design.




Regulator

PVOUT3 Output Voltage 1 VVO31 PVOUT3=No load 3.267 3.300 3.333 V 1

PVOUT3 Output Voltage 2 VVO32 PVOUT3=10mA 3.252 3.300 3.333 V 1

Line Regulation VLINEPVOUT3=1mA

AVIN=3.4 to 5.5V0.05 0.25 %/V 1

Load Regulation VLOAD 1mA PVOUT3 10mA 5 15 mV 1

Dropout Voltage VIOPVOUT3=10mA

AVIN=3.1V0.10 0.18 V 1

Ripple Rejection 1 (Note5) RR1PVOUT3=1mA

f=1kHz60 dB

Ripple Rejection 2 (Note5) RR2PVOUT3=1mA

f=10kHz40 dB

Output Short-circuit Current (Note5) ILIM VPVO3=0V 40 mA

PVOUT3 Discharge TrON Resistance PVOUT3

RDVO3EN23=0V

PVOUT3=3.3V1 k 2

Power Good

P_GOOD1, 2 Detection Voltage

VPGADMonitor AVIN Voltage

AVIN=2.8 0VVUVLOD

+50 mV 2

P_GOOD1Detection Voltage

VPGFB1DMonitor FB1 Voltage

FB1=0.6 0V0.46 0.50 0.54 V 2

P_GOOD2Detection Voltage

VPGFB2DMonitor FB2 Voltage

FB2=0.6 0V0.46 0.50 0.54 V 2

P_GOOD1, P_GOOD2 Release Voltage

VPGARMonitor AVIN Voltage

AVIN=0 2.8VVPGAD

+100VPGAD

+150VPGAD

+200 mV 2

P_GOOD1Release Voltage

VPGFB1RMonitor FB1 Voltage

FB1=0 0.8VVPGFB1D

+10VPGFB1D

+25VPGFB1D

+40 mV 2

P_GOOD2Release Voltage

VPGFB2RMonitor FB2 Voltage

FB2=0 0.8VVPGFB2D

+10VPGFB2D

+25VPGFB2D

+40 mV 2

P_GOOD1, 2 "L"Output Voltage

VPGOLFB1=FB2=0V

P_GOOD1, 2=10mA0.12 0.30 V 2

P_GOOD1, 2 Pin Sink Current (Note5, 6)

IPGSINKFB1=FB2=0V

P_GOOD1, 2=5V100 150 mA 2

P_GOOD1, 2 Pin Leakage Current

IPGLKFB1=FB2=0.65VP_GOOD1, 2=6V

-1.0 +1.0 µA 2


Note6 : Please use it under Power dissipation. It shows in 13.TYPICAL APPLICATION CIRCUIT about calculation method of Loss.




Delay time

Start / Stop Delay Time (Note7)

tSTDLY

EN1, 23=0V 3VEN1 : Ch1 enable

EN23 : Ch2, LDO enable10 us 2

P_GOOD Detection Blanking Time During SoftStart (Note7)

tDTDLY_SS5.5×tSS

8.3×tSS

ms 1

P_GOOD Detection Blanking Time (Note7)

tDTDLYAVIN=4.5V VPGAD,

FB1(FB2)=0.6 VPGFB10 us 2

SW1, 2 Current Limit TimerLatch Time (Note7)

tLIMSWDLY 1.5 ms 1




Measuring Circuit

A

A

A

A

V

V

V

A

FB1

oscilloscope

2.7µH

2.7µH

10µF

10µF

1µF

VOUT11.8V

VOUT21.8V

VIN

22µF

22µF

39pF

39pF

1k

1k

240k

240k

120k

120k

oscilloscope

oscilloscopeoscilloscope

oscilloscope

oscilloscopeFB2

TP

PVOUT3

PVIN1

AGND15

14

13

16

1 2 3 4

5

6

7

8

9101112

AVIN

PVIN2

EN

1

SW

1

PG

ND

1

P_G

OO

D2

P_G

OO

D1

EN

23

SW

2

PG

ND

2

MM3558

(1)

V

A

A A V

V

A

A

VAA

FB1

oscilloscope

10µF

10µF

1µFVIN

1koscilloscope

oscilloscopeoscilloscope

FB2

TP

PVOUT3

PVIN1

AGND15

14

13

16

1 2 3 4

5

6

7

8

9101112

AVIN

PVIN2

EN

1

SW

1

PG

ND

1

P_G

OO

D2

P_G

OO

D1

EN

23

SW

2

PG

ND

2

MM3558

1k

(2)



Timing Chart(1) Each output start, stop timing

EN1

EN2

VOUT1

VOUT2

FB1

FB2

PVOUT3

P_GOOD1

P_GOOD2

5.5×tSS

3.3V

0.54V 0.50V 0.525V

0.54V 0.50V 0.525V

0.6V 0.6VSoftStart

0.6V 0.6VSoftStart

Output up

Output down

Output up

Output down

Discharge(100 )

Discharge(1k )

tDTDLY=10us

5.5×tSS tDTDLY=10us

tSTDLY=10us

tSTDLY=10us

tSTDLY=10us

tSTDLY=10us

AVIN=PVIN1=PVIN2=5.0V

The delay time (10us typ.) has been set for the input of enable terminal EN1 and EN23.Therefore, IC-output doesn't response when a short signal of the cycle is input to an enable terminal at delay time.



P_GOOD2P_GOOD1

P_GOOD2P_GOOD1

PVOUT3

PVOUT3

(VOUT2)FB2

(VOUT2)FB2

(VOUT1)FB1

(VOUT1)FB1

PVINAVIN

PVINAVIN

2.55V

2.60V

0.54V

0.54V

0.54V

0.54V

0.6V 0.6V

0.6V

3.3V

2.7V

5.0V

5.0V

0.6V

0.6V

3.3V

5.0V5.8V5.65V

0.6V

3.3V

SoftStart

SoftStart SoftStart

Discharge(100 )

Discharge(1k )

tDTDLY=10us

t<tDTDLY(=10us)

5.5×tSS 5.5×tSS

AVIN=PVIN1=PVIN2=EN1=EN23

Discharge(100 )

Discharge(1k )

FB pin voltage decreases to discharge electricityby low side Tr when starting.

• UVLO detection, OVP_IN detection

(2) Protected operation

When AVIN rises and the input overvoltage is detected, VOUT1, 2, and PVOUT3 are turned off.Operation can be returned by decreasing AVIN.

The P_GOOD changes to "L" in the condition of the AVIN P_GOOD detecting voltage (Monitor AVIN voltage) after delay time. However, it doesn't respond for a signal of the cycle short following delay time.



P_GOOD2P_GOOD1

PVOUT3

VOUT2

FB2

(VOUT1)FB1

EN23

EN1

0.6V

3.3V

0.6V

0.6V

0.72V0.6V

0.72V

0.54V

0.54V

0.54V

0.54V

SoftStart

SoftStart

SoftStart

SoftStart

tSTDLY=10us tSTDLY=10us

5.5×tSS 5.5×tSS

FB2 pin voltageabnormal rise

FB1 pin voltageabnormal rise

AVIN=PVIN1=PVIN2=5.0V

Discharge(100 )

Discharge(1k )

Discharge(100 )

Discharge(1k )

FB pin voltage decreases to discharge electricityby low side Tr when starting.

It doesn't returnbecause both EN1and EN23 not "L".

• OVP_OUT detection

The output overvoltage protection circuit works when the DC/DC converter voltage of the FB pinexceeds 0.72V(TYP.), the switching of SW1 and SW2 stops, the PVOUT3 output is turned off,and the state is maintained.

It is necessary to decrease AVIN below VIN UVLO detection voltage so that the FB pin may release(FB1, FB2< 0.72V) when released and the state of the latch from the state of the output overvoltage or to make both EN1 and EN23 "L".



VOUT

SWCurrent

SWVoltage

Normal operation Normal operationCurrent limit operation

Current limit operation

SwitchingStop

0V

0A

1.7A

t<1.5ms t=1.5ms

• Over current protection for DC/DC converter

• Over current protection for PVOUT3

(3) Over current protection

When a current limit is continuously detected between 1.5ms, the DC/DC converter maintainsOFF state with the short-circuit protection circuit. And, both SW1 and SW2 switching are stopped, and the PVOUT3 output is turned off, too.

The output of the DC/DC converter and PVOUT3 returns by turning on both the re-turning on or EN1and EN23 power supplies again.

Even if over-current protection of PVOUT3 is effective, it does not have the infl uence on DC/DC converter operation. The output of PVOUT3 will also return, if over-current protection of PVOUT3 is canceled.



Flow Chart

Power ON

OUT1, 2, 3 OFFVREF OFF

Protection Disable

OUT1, 2, 3 OFF(Automatic recovery

Disable)

OUT1, 2, 3 OFF(Automatic recovery

Enable)(=OVP_IN or UVLO or TSD Detected)

P_GOOD1=Hi-Z(P_GOOD2)

P_GOOD1=L(P_GOOD2)

P_GOOD1 and 2=L

OVP_OUTor Over Current

Detected

Any ofprotection signal

Detected

Any ofprotection signal

Detected

AVIN andFB1(FB2) P_GOOD

Detected

FB1(FB2) P_GOODDetected

AVIN P_GOODDetected

EN1=Hor

EN23=H

EN1=Land

EN23=L

VREF ONProtection Enable

EN1=H(EN23)

EN1=L(EN23)

EN1=L(EN23)

EN1=H(EN23)

OUT1 ON(OUT2, 3)

OUT1 OFF(OUT2, 3)

Automatic recoveryEnable

OUT1 ON (Recovery)(OUT2, 3)

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

EN1=Land

EN23=L

UVLODetected

OVP_IN orUVLO or TSDUndetected

No

Yes

No

Yes

No

Yes

No

Yes

No

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

Yes



Application Circuit

AGND

AVIN

MM3558

1µF

3.3V

"H" / "L"

"H" / "L"

22µF 22µF

R11

C11 C21

VIN

1k 1k

R12

R21

R22

2.7µH 2.7µH

10µF 10µF

1µF

VOUT1 VOUT2

VIN3.0V to 5.5V

P_GOOD1

FB2

SW2

PGND2

PVIN2

P_GOOD2PVOUT3

EN23

EN1

FB1

SW1

PGND1

PVIN1

P_GOOD1

P_GOOD2

Application notes

(1) Setting of output voltage · The output voltage can be calculated by the following expressions. VOUT1=0.6×(1+R12/R11) · Please set not to exceed R11+R12=1M from the reason for stability. · Please adjust for Zero points fz of the feedback loop to become 20kHz the value of C11 for the phase compensation. Zero points fz are calculated by the following expression. fz=1/(2× ×C11×R12) · It becomes the best by adjusting fz according to the value of the usage, inductance, and the output capacity. · Please set VOUT2 as well as VOUT1.

(2) When PVOUT3 is not used · The capacitor of 1uF is recommended to be connected with the terminal even when PVOUT3 is not used. · There is a possibility of connecting it with the problem of an increase of the supply current etc. when the terminal is opened or it is used while it is short-circuited in the power supply.



(3) About the calculation of IC loss · The substrate size mounts on two glass epoxy layer substrate (90% of rate of copper interconnect) to which it is referring in Note3 of the RECOMMENDED OPERATING CONDITIONS is computed for an example. · The power dissipation at 25°C to 150°C is computable with about 2.01 W from thermal resistance 62.2°C/W. For example, when carrying out the pull-up of the P_GOOD terminal to an external power supply, if it connects with 5V power supply directly, 150 mA (typ.) sink current will flow. As a loss of a P_GOOD terminal, PP_GOOD = 5V x 150mA = 0.75W occur. When P_GOOD1 and 2 both sides are set as the same conditions, since 1.5W (typ.) loss occurs, it is the calculation which generates heat about 93.3°C. By element variation, temperature variation, other losses in a circuit, and thermal resistance by substrate conditions, since a loss/calorific value is changed, please set up the conditions of a P_GOOD terminal after fully examining a loss and calorific value by the set of use. (4) About the output operation of 1.0V or less · If an input-and-output voltage difference is large and ON Duty falls, it becomes impossible to take operation in the PWM mode stable like following figure A. The stability of input voltage of operation over 1.0V or less is shown in fi gure B.

VOUT50mV/div(offset : 0.8V)

SW2V/div

VIN (V)

VO

UT

(V)

1.0

0.9

0.8

Stable area

Unstable area

3.0 3.5 4.0 4.5 5.0 5.5 6.0

Representation data

Figure.A Unstable operation waveform

Figure.B 1V or less output vs VIN operation stability



Characteristics (Except where noted otherwise Ta=25°C)

AVIN (V)

IDD

2 (µ

A)

600

500

400

300

200

100

00 1 2 3 4 5 6

Supply Current 2 (EN1=0V, AVIN=PVIN1,2=0 6.0V)

Supply Current 1 (EN23=0V, AVIN=PVIN1,2=0 6.0V)

AVIN (V)

IDD

1 (µ

A)

500

400

300

200

100

00 1 2 3 4 5 6

Supply Current (EN1=EN23=5V, AVIN=PVIN1,2=0 6.0V)

AVIN (V)

IDD

3 (µ

A)

900

800

700

600

500

400

300

200

100

00 1 2 3 4 5 6

Shutdown Current (EN1=EN23=0V, AVIN=PVIN1,2=0 6.0V)

AVIN (V)

IOF

F (µ

A)

5

4

3

2

1

00 1 2 3 4 5 6

Line regulation VOUT1(1.8V) (AVIN=PVIN1=0 6.0V)

AVIN (V)

VO

UT

1 (V

)

1.90

1.85

1.80

1.75

1.702 3 4 5 6



IOUT2 (mA)

VO

UT

2 (V

)

1.30

1.25

1.20

1.15

1.100.1 1 10 100 1000 10000

Load regulation VOUT2(1.2V) (AVIN=PVIN2=5.0V, IOUT=0 2000mA)

Load regulation VOUT1(1.8V) (AVIN=PVIN1=5.0V, IOUT=0 2000mA)

IOUT1 (mA)

VO

UT

1 (V

)

2.00

1.90

1.80

1.70

1.60

1.500.1 1 10 100 1000 10000

Efficiency VOUT1(1.8V) (AVIN=PVIN1=5.0V,EN23=0,IOUT=0 2000mA)

IOUT1 (mA)

Eff

icie

ncy

(%)

100

80

60

40

20

00.1 1 10 100 1000 10000

Efficiency VOUT2(1.2V) (AVIN=PVIN2=5.0V,EN1=0,IOUT=0 2000mA)

IOUT2 (mA)

Eff

icie

ncy

(%)

100

80

60

40

20

00.1 1 10 100 1000 10000

Line regulation PVOUT3 (AVIN=0 6.0V, IOUT=1mA)

AVIN (V)

PV

OU

T3

(V)

3.4

3.3

3.2

3.1

3.0

2.9

2.82 3 4 5 6

Load regulation PVOUT3 (AVIN=5.0V, IOUT=0 100mA)

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.00.1 1 10 100

IOUT (mA)

PV

OU

T3

(V)



IDD

2 (µ

A)

600

500

400

300

200

100

0

Temperature (ºC)

−40 −20 0 20 40 60 80 100

Supply current 2 - Temperature Supply current 1 - TemperatureID

D1

(µA

)

500

400

300

200

100

0

Temperature (ºC)

−40 −20 0 20 40 60 80 100

Supply current - Temperature

IDD

3 (µ

A)

900

800

700

600

500

400

300

200

100

0

Temperature (ºC)

−40 −20 0 20 40 60 80 100

Shutdown current - Temperature

IOF

F (µ

A)

2.5

2.0

1.5

1.0

0.5

0.0

Temperature (ºC)

−40 −20 0 20 40 60 80 100

FB1 Voltage - Temperature (AVIN=PVIN1=5.0V, IOUT=300mA)

VF

B1

(V)

0.64

0.62

0.60

0.58

0.56

Temperature (ºC)

−40 −20 0 20 40 60 80 100

FB2 Voltage - Temperature (AVIN=PVIN1=5.0V, IOUT=300mA)

VF

B2

(V)

0.64

0.62

0.60

0.58

0.56

Temperature (ºC)

−40 −20 0 20 40 60 80 100



fOS

C (M

Hz)

2.2

2.1

2.0

1.9

1.8

Temperature (ºC)

−40 −20 0 20 40 60 80 100

Oscillator Frequency - Temperature PVOUT3 - Temperature (AVIN=5.0V, IOUT=No Load)

PV

OU

T3

(V)

3.50

3.40

3.30

3.20

3.10

Temperature (ºC)

−40 −20 0 20 40 60 80 100

EN1 Start-Up (AVIN=PVIN1=5.0V, EN1=0 5V)

(1ms/div)

EN1(1V/div)

VOUT1(0.5V/div)

P_GOOD1(1V/div)

EN23 Start-Up (AVIN=PVIN2=5.0V, EN23=0 5V)

(1ms/div)

EN23(1V/div)

VOUT2(0.5V/div)

PVOUT3(0.5V/div)

P_GOOD2(1V/div)

Switching Operation (AVIN=PVIN1=5.0V)

(200ns/div)

VOUT1(20mV/div)

SW1(1V/div)



(10µs/div)

SW1(1V/div)

VOUT1(20mV/div)

IOUT1(0.1A/div)

(AVIN=PVIN1=5.0V, VOUT1=1.8V, IOUT1=500mA 50mA) Load Transient Response

(AVIN=PVIN1=5.0V, VOUT1=1.8V, IOUT1=50mA 500mA)

(10µs/div)

SW1(1V/div)

VOUT1(20mV/div)

IOUT1(0.1A/div)


(10µs/div)

SW2(1V/div)

VOUT2(20mV/div)

IOUT2(0.1A/div)


(10µs/div)

SW2(1V/div)

VOUT2(20mV/div)

IOUT2(0.1A/div)

MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch ... · MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series 2ch Synchronous Step-down DC/DC

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