MYRGM345150B31RA_技术文档

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

☆GreenOperationCompatible

■GENERAL DESCRIPTION

The MYRGM-W/MYRGM-B series is a synchronous step-down mini DC/DC converter

which integrates an inductor and a control IC in one tiny package (2.5mm×3.2mm, h=1.0mm).

An internal coil simplifies the circuit and enables minimization of noise and other operational

trouble due to the circuit wiring. A wide operating voltage range of 2.7V to 5.5V enables

Support for applications that require an internally fixed output voltage (0.8V to 3.6V).

The MYRGM-W/MYRGM-B series use synchronous rectification at an operating frequency

of 3.0MHz. The MYRGM-W/MYRGM-B series use High Speed Transient Response-COT.

PWM control (MYRGM-W) or automatic PWM/PFM switching control (MYRGM-B) can be selected.

The series have a high speed soft-start as fast as 0.3ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock

Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.0V or lower. When

CE=Low, the integrated C_Ldischarge function which enables the electric charge at the output capacitor C_Lto be discharged via

the internal discharge switch located between the L_Xand V_SSpins. The power consumption will be less than 1.0μA.

■FEATURES

■APPLICATIONS

Input Voltage

:2.7V～5.5V

:0.8V～3.6V

:3.0MHz

:1.5A

●Note BookPC

●TabletPC

●SSD

OutputVoltage

Oscillation Frequency

Output Current

Efficiency

●Mobilephone

●Projector

●Printer

: 92% (V_IN=5.0V, V_OUT=3.3V/500mA)

High Speed Transient Response-COT

:

ControlMethods

100% DutyCycle

PWM (MYRGM-W)

PWM/PFM(MYRGM-B)

: Thermal Shut Down Current

Limit Circuit(Drop)

CircuitProtection

Functions

Short Circuit Protection (Latch)

: Soft-start Circuit Built-in

UVLO

C_LDischarge

Output Capacitor

: Low ESR CeramicCapacitor

Operating Ambient Temperature

EnvironmentallyFriendly

: -40℃～+105℃

: EU RoHS Compliant, Pb Free

Halogen Free

■TYPICAL PERFORMANCE

■TYPICAL APPLICATIONCIRCUIT

CHARACTERISTICS

MYRGM-W/MYRGM-B

(V_OUT=3.3V)

100

MYRGM-B

80

60

40

MYRGM-W

20

V_IN=5.0V

1000 10000

0

0.1

1

10

100

Output Current : I_OUT(mA)

MYRGM-W/B series A01 Page 1 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■BLOCK DIAGRAM

* The MYRGM-W offers a fixed PWM control, a Control Logic of PWM/PFM Selector is fixed at “PWM” internally.

The MYRGM-B control scheme is a fixed PWM/PFM automatic switching, a Control Logic of PWM/PFM Selector is fixed at “PWM/PFM automatic

switching” internally.

Diodes inside the circuit are an ESD protection diode and a parasitic diode.

MYRGM-W/B series A01 Page 2 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■PIN CONFIGURATION

CE 6

AGND 5

VOUT 4

1 VIN

2 NC

3 Lx

7

PGND

9

8

L2

L1

BOTTOMVIEW

■PINASSIGNMENT

PINNUMBER

PINNAME

V_IN

FUNCTIONS

PowerInput

1

2

3

4

5

6

7

8

9

NC

NoConnection

SwitchingOutput

Lx

V_OUT

AGND

CE

Fixed Output Voltage PIN

AnalogGround

ChipEnable

PGND

L1

PowerGround

InductorElectrodes

L2

* This 2-pin NC terminal is not connected to an IC chip.

■FUNCTION TABLE

CE PIN Function

PINNAME

SIGNAL

Low

STATUS

Stand-by

Active

1

2

High

* Please do not leave the CE pin open.

■ABSOLUTE MAXIMUM RATINGS

Ta=25℃

UNITS

PARAMETER

V_INPin Voltage

SYMBOL

V_IN

RATINGS

-0.3 ~ + 6.2

V

L_XPin Voltage

V_Lx

- 0.3 ~ V_IN+ 0.3 or + 6.2 ^(*1)

- 0.3 ~ V_IN+ 0.3 or + 4.0^(*2)

- 0.3 ~ +6.2

V_OUTPin Voltage

V_out

V

CE Pin Voltage

V_CE

V

Power Dissipation

Operating AmbientTemperature

Storage Temperature

Pd

1200

mW

℃

Topr

T_stg

- 40 ~ +105

- 55 ~ +125

All voltages are described based on the GND (AGND and PGND) pin.

^(*1)The maximum value should be either V_IN+0.3 or +6.2 in the lowest voltage

^(*2)The maximum value should be either V_IN+0.3 or +4.0 in the lowest voltage

MYRGM-W/B series A01 Page 3 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■ELECTRICAL CHARACTERISTICS

●MYRGMxxxxxxW31RA/MYRGMxxxxxxB31RA

Ta=25℃

PARAMETER

Output Voltage

SYMBOL

V_OUT

CONDITIONS

MIN.

TYP.

MAX.

UNITS

V

CIRCUIT

When connected to external conponets,

I_OUT=30mA

<E-1>

<E-2>

<E-3>

①

V_IN

Operating Voltage Range

2.7

-

5.5

V

①

When connected to external components,

V_IN=<C-1>

I_OUTMAX

V_UVLO

Maximum Output Current

UVLO Voltage ^(*2)

1500

1.35

-

mA

V

①

③

②

V_out=0.6V,

2

2.68

40

Voltage which Lx pin holding ”L” level (*6)

Quiescent Current

(MYRGM-B)

V_OUT=V_OUT(E)×1.1V

I_q

25

μA

Quiescent Current

(MYRGM-W)

V_OUT=V_OUT(E)×1.1V

I_q

-

400

0

825

1

μA

ns

②

①

I_STB

Stand-by Current

V_CE=0V

When connected to external components,

V_IN=V_CE=<C-1>, I_OUT=1mA

t_ONmin

T_TSD

Minimum ON time ^(*2)

<E-5>

<E-6>

<E-7>

Thermal Shutdown

-

150

30

-

℃

①

Thermal shutdown

Hysteresis

T_HYS

LxSW ”H” ON

Resistance

R_LXH

R_LXL

(*3)

V_OUT=0.6V, I_LX=100mA

-

0.14

0.1

0.28

0.2

Ω

④

LxSW ”L” ON

Resistance (*4)

(*3)

V_OUT=V_OUT(T)× 1.1V, I_LX=100mA

I_LeakH

I_LeakL

I_LIMH

LxSW ”H” Leakage Current

LxSW ”L” Leakage Current

Current Limit ^(*5)

V_IN=5.5V, V_CE=0V, V_OUT=0V, V_LX=5.5V

V_IN=5.5V, V_CE=0V, V_OUT=0V, V_LX=0V

V_OUT=0.6V, I_Lxuntil Lx pin oscillates

-

0

3

30

1

μA

A

⑤

⑥

2.5

4.5

OutputVoltage

Temperature

Characteristics

ΔV_OUT

/

I_OUT=30mA

-

±100

-

ppm/℃

①

(VOUT・Δtopr) -40℃≦Topr≦105℃

V_OUT=0.6V, Applied voltage to V_CE,

V_CEH

V_CEL

I_CEH

I_CEL

V_IN

CE”H” Voltage

CE”L” Voltage

1.4

-

V

③

Voltage changes Lx to “H” level ^(*6)

V_OUT=0.6V, Applied voltage to V_CE,

AGND

0.3

Voltage changes Lx to “L” level ^(*6)

CE”H” Current

CE”L” Current

V_IN=5.5V, V_CE=5.5V, V_OUT=0V

V_IN=5.5V, V_CE=0V, V_OUT=0V

-0.1

-

0.1

μA

⑤

V_CE=0V→5.0V, V_OUT=V_OUT(T)V × 0.9

After "H" is fed to CE, the time by when

clocks are generated at Lx pin.

t_SS

Soft-start Time

0.1

0.3

0.5

ms

V

③

Short Protection

Threshold Voltage

Sweeping V_OUT, V_OUTvoltage which Lx

becomes “L” level (*6)

V_SHORT

R_DCHG

0.17

0.27

0.37

C_LDischarge

Inductance

V_CE=0V, V_OUT=4.0V

Test Freq.=1MHz

∆T=+40deg

50

-

210

0.5

1.8

300

Ω

μH

A

⑦

-

L

-

I_DC

Inductor Rated Current

-

Unless otherwise stated, VIN=5.0V, VCE=5.0V, VOUT(T)=Nominal Voltage

NOTE:

^(*1)When the difference between the input and the output is small, 100% duty might come up and internal control circuits keep P-ch driver turning

on even though the output current is not so large.

If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.

^(*2)Including UVLO detect voltage, hysteresis operating voltage range for UVLO release voltage.

^(*3)RLXH=(VIN - Lx pin measurement voltage) / 100mA, RLXL=Lx pin measurement voltage / 100mA

^(*4)Design value for the MYRGM-B series

^(*5)Current limit denotes the level of detection at peak of coil current.

^(*6)"H"=VIN～VIN - 1.2V, "L"=- 0.1V～+ 0.1V

MYRGM-W/B series A01 Page 4 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■ELECTRICAL CHARACTERISTICS

●MYRGMxxxxxxW31RA/MYRGMxxxxxxB31RA

Ta=25℃

PARAMETER

Output Voltage

SYMBOL

V_OUT

CONDITIONS

MIN.

TYP.

MAX.

UNITS

V

CIRCUIT

When connected to external conponets,

I_OUT=30mA

<E-1>

<E-2>

<E-3>

①

V_IN

Operating Voltage Range

2.7

-

5.5

V

①

When connected to external components,

V_IN=<C-1>

I_OUTMAX

V_UVLO

Maximum Output Current

UVLO Voltage ^(*2)

1500

1.35

-

2

-

mA

V

①

③

②

V_out=0.6V,

2.68

40

Voltage which Lx pin holding ”L” level (*6)

Quiescent Current

(MYRGM-B)

V_OUT=V_OUT(E)×1.1V

I_q

25

μA

Quiescent Current

(MYRGM-W)

V_OUT=V_OUT(E)×1.1V

I_q

-

400

0

825

1

μA

ns

②

①

I_STB

Stand-by Current

V_CE=0V

When connected to external components,

V_IN=V_CE=<C-1>, I_OUT=1mA

t_ONmin

T_TSD

Minimum ON time ^(*2)

<E-5>

<E-6>

<E-7>

Thermal Shutdown

-

150

30

-

℃

①

Thermal shutdown

Hysteresis

T_HYS

LxSW ”H” ON

Resistance

R_LXH

R_LXL

I_LeakH

(*3)

V_OUT=0.6V, I_LX=100mA

-

0.14

0.1

0

0.28

0.2

30

Ω

④

⑤

LxSW ”L” ON

Resistance (*4)

(*3)

V_OUT=V_OUT(T)× 1.1V, I_LX=100mA

LxSW ”H” Leakage

V_IN=5.5V, V_CE=0V, V_OUT=0V, V_LX=5.5V

μA

Current

LxSW ”L” Leakage

I_LeakL

I_LIMH

ΔV_OUT

V_IN=5.5V, V_CE=0V, V_OUT=0V, V_LX=0V

V_OUT=0.6V, I_Lxuntil Lx pin oscillates

I_OUT=30mA

-

0

3

1

μA

⑤

⑥

Current

Current Limit ^(*5)

2.5

4.5

A

Output Voltage

Temperature

Characteristics

/

-

±100

-

ppm/℃

①

(VOUT・Δtopr) -40℃≦Topr≦105℃

V_OUT=0.6V, Applied voltage to V_CE,

V_CEH

V_CEL

I_CEH

I_CEL

V_IN

CE”H” Voltage

CE”L” Voltage

1.4

-

V

③

Voltage changes Lx to “H” level ^(*6)

V_OUT=0.6V, Applied voltage to V_CE,

AGND

0.3

Voltage changes Lx to “L” level ^(*6)

CE”H” Current

CE”L” Current

V_IN=5.5V, V_CE=5.5V, V_OUT=0V

V_IN=5.5V, V_CE=0V, V_OUT=0V

-0.1

-

0.1

μA

⑤

V_CE=0V→5.0V, V_OUT=V_OUT(T)V × 0.9

After "H" is fed to CE, the time by

when clocks are generated at Lx pi.

t_SS

Soft-start Time

0.2

0.4

0.9

ms

V

③

Short Protection

Threshold Voltage

Sweeping V_OUT, V_OUTvoltage which Lx

becomes “L” level (*6)

V_SHORT

R_DCHG

0.17

0.27

0.37

C_LDischarge

Inductance

V_CE=0V, V_OUT=4.0V

Test Freq.=1MHz

∆T=+40deg

50

-

210

0.5

1.8

300

Ω

μH

A

⑦

-

L

-

I_DC

Inductor Rated Current

-

Unless otherwise stated, VIN=5.0V, VCE=5.0V, VOUT(T)=Nominal Voltage

NOTE:

^(*1)When the difference between the input and the output is small, 100% duty might come up and internal control circuits keep P-ch driver turning

on even though the output current is not so large.

If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.

^(*2)Including UVLO detect voltage, hysteresis operating voltage range for UVLO release voltage.

^(*3)RLXH=(VIN - Lx pin measurement voltage) / 100mA, RLXL=Lx pin measurement voltage / 100mA

^(*4)Design value for the MYRGM-B series

^(*5)Current limit denotes the level of detection at peak of coil current.

^(*6)"H"=VIN～VIN - 1.2V, "L"=- 0.1V～+ 0.1V

MYRGM-W/B series A01 Page 5 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■ELECTRICAL CHARACTERISTICS

●SPEC Table (V_OUT, t_ONmin

)

t_ONmin

NOMINAL

OUTPUT

VOLTAGE

NOMINAL

OUTPUT

VOLTAGE

V_OUT

<E-2>

V_OUT

f_OSC=3.0MHz

<E-1>

<E-3>

<C-1>

<E-5>

<E-6>

<E-7>

<E-1> <E-2>

<E-3>

<C-1>

<E-5>

<E-6>

<E-7>

MIN.

0.784

0.833

0.882

0.931

0.980

1.029

1.078

1.127

1.176

1.225

1.274

1.323

1.372

1.421

1.470

1.519

1.568

1.617

1.666

1.715

1.764

1.813

1.862

1.911

1.960

2.009

2.058

2.107

2.156

TYP.

0.800

0.850

0.900

0.950

1.000

1.050

1.100

1.150

1.200

1.250

1.300

1.350

1.400

1.450

1.500

1.550

1.600

1.650

1.700

1.750

1.800

1.850

1.900

1.950

2.000

2.050

2.100

2.150

2.200

MAX.

0.816

0.867

0.918

0.969

1.020

1.071

1.122

1.173

1.224

1.275

1.326

1.377

1.428

1.479

1.530

1.581

1.632

1.683

1.734

1.785

1.836

1.887

1.938

1.989

2.040

2.091

2.142

2.193

2.244

MIN.

71

TYP.

119

121

122

123

130

136

142

148

154

160

167

173

179

185

191

198

200

MAX.

166

169

171

172

160

169

177

185

193

201

209

217

225

233

241

249

257

260

MIN.

2.205

2.254

2.303

2.352

2.401

2.450

2.499

2.548

2.597

2.646

2.695

2.744

2.793

2.842

2.891

2.940

2.989

3.038

3.087

3.136

3.185

3.234

3.283

3.332

3.381

3.430

3.479

3.528

TYP.

2.250

2.300

2.350

2.400

2.450

2.500

2.550

2.600

2.650

2.700

2.750

2.800

2.850

2.900

2.950

3.000

3.050

3.100

3.150

3.200

3.250

3.300

3.350

3.400

3.450

3.500

3.550

3.600

MAX.

2.295

2.346

2.397

2.448

2.499

2.550

2.601

2.652

2.703

2.754

2.805

2.856

2.907

2.958

3.009

3.060

3.111

3.162

3.213

3.264

3.315

3.366

3.417

3.468

3.519

3.570

3.621

3.672

MIN.

140

142

144

146

148

151

153

TYP.

200

203

206

209

212

215

218

MAX.

260

264

268

272

276

280

284

V_OUT(T)

0.80

0.85

0.90

0.95

1.00

1.05

1.10

1.15

1.20

1.25

1.30

1.35

1.40

1.45

1.50

1.55

1.60

1.65

1.70

1.75

1.80

1.85

1.90

1.95

2.00

2.05

2.10

2.15

2.20

V_IN

V_OUT(T)

2.25

2.30

2.35

2.40

2.45

2.50

2.55

2.60

2.65

2.70

2.75

2.80

2.85

2.90

2.95

3.00

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

3.55

3.60

V_IN

2.70

2.75

2.83

2.92

3.00

3.08

3.17

3.25

3.33

3.42

3.50

3.58

3.67

3.75

3.83

3.92

4.00

4.08

4.17

4.25

4.33

4.42

4.50

4.58

4.67

4.75

4.83

4.92

5.00

5.08

5.17

5.25

5.33

5.42

5.50

72

73

74

86

91

95

99

104

108

112

117

121

125

130

134

138

140

■TYPICAL CIRCUIT

VALUE

10V/10μF

C_INC_L

NOTE:

*1: Max. Temp. for the cap. is +85℃ .

*2: Max. Temp. for the cap. is +125℃.

The integrated Inductor can be used only for this DC/DC

converter. Please do not use this inductor for other

reasons.

When under the condition of the voltage difference between input

voltage and output voltage is low, please use 125℃ product, which

has small capacity drop.

MYRGM-W/B series A01 Page 6 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■TEST CIRCUITS

< Circuit No.① >

< Circuit No.② >

Wave Form Measure Point

L

L2

L1

L2

L1

Lx

VOUT

Lx

VOUT

VIN

A

VIN

AGND

A

CL

V

RL

1μF

CIN

PGND

CE

※External Components L：

1.0μH(Selected goods)

CIN,CL:10μF(Ceramic)

< Circuit No.③ >

< Circuit No.④ >

Wave Form Measure Point

L2

L1

L2

L1

VOUT

Lx

VOUT

Lx

VIN

AGND

VIN

AGND

V

1μF

RPulldown

ILX

1μF

200Ω

PGND

CE

PGND

CE

RLXH=(VIN-VL)/ILX

RLXL=VLX/ILX

< Circuit No.⑤ >

< Circuit No.⑥ >

Wave Form Measure Point

L2

L1

L2

L1

ILeakH

A

VOUT

Lx

VOUT

Lx

ILeakL

1μF

VIN

AGND

ICEH

AGND

VIN

ILIMH

1μF

V

A

PGND

CE

PGND

ICEL

< Circuit No.⑦ >

L2

L1

A

VOUT

Lx

VIN

AGND

1μF

CE

PGND

MYRGM-W/B series A01 Page 7 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■OPERATIONAL EXPLANATION

The MYRGM-W/MYRGM-B series consists of a reference voltage source, error amplifier, comparator, phase compensation,

minimum on time generation circuit, output voltage adjustment resistors, P-channel MOS driver transistor, N-channel MOS

switching transistor for the synchronous switch, current limiter circuit, UVLO circuit, thermal shutdown circuit, short protection

circuit, PWM/PFM selection circuit and others. (See the BLOCK DIAGRAM below.)

The method is High Speed circuit Architecture for Transient with Constant On Time control, which features on time control

method and a fast transient response that also achieves low output voltage ripple.

The on time (ton) is determined by the input voltage and output voltage, and turns on the Pch MOS driver Tr. for a fixed time.

During the off time (toff), the voltage that is fed back through R1 and R2 is compared to the reference voltage by the error amp,

and the error amp output is phase compensated and sent to the comparator. The comparator compares this signal to the

reference voltage, and if the signal is lower than the reference voltage, sets the SR latch. On time then resumes. By doing this,

PWM operation takes place with the off time controlled to the optimum duty ratio and the output voltage is stabilized. The phase

compensation circuit optimizes the frequency characteristics of the error amp, and generates a ramp wave similar to the ripple

voltage that occurs in the output to modulate the output signal of the error amp. This enables a stable feedback system to be

obtained even when a low ESR capacitor such as a ceramic capacitor is used, and a fast transient response and stabilization of

the output voltage are achieved.

Generates an on time that dependson the input voltageand outputvoltage(ton). Theon time is set as givenby the equations below.

ton (ns) =VOUT/VIN×333

The switching frequency can be obtained from the on time (ton), which is determined by the input voltage and output voltage,

as given by the equationbelow.

fOSC (MHz) = VOUT(V) / (VIN(V)×ton(ns))

<100% duty cycle mode>

When the load current is heavy and the voltage difference between input voltage and output voltage is small, 100% duty cycle

mode is activated and it keeps the Pch MOS driver Tr. turning on. 100% duty cycle mode attains a high output voltage stability

and a high-speed response under all load conditions, from light to heavy, even in conditions where the dropout voltage is low.

The error amp monitors the output voltage. The voltage divided by the internal R1 and R2 resistors is a feedback voltage for

Error Amp. and compared to the reference voltage. The output voltage of the error amp becomes higher when the feedback

voltage is higher than the reference voltage. The frequency characteristics of the error amp are optimized internally.

MYRGM-W/B series A01 Page 8 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■OPERATIONAL EXPLANATION (Continued)

The current limiter circuit of the MYRGM-W/MYRGM-B series monitors the current flowing through the P-channel MOS driver

transistor connected to the Lx pin. When the driver current is greater than a specific level, the current limit function operates to

turn off the pulses from the Lx pin at any given timing. When the over current state is eliminated, the IC resumes its normal

operation.

The reference voltage forms a reference that is used to stabilize the output voltage of the IC. After chip enable of the IC, the

reference voltage connected to the error amp increases linearly during the soft-start interval.

This allows the voltage divided by the internal R1 and R2 resistors and the reference voltage to be controlled in a balanced

manner, and the output voltage rises in proportion to the rise in the reference voltage. This operation prevents rush input current

and enables the output voltage to rise smoothly.

If the output voltage does not reach the set output voltage within the soft start time, such as when the load is heavy or a large

capacity output capacitor is connected, the balancing of the voltage divided by the internal resistors R1 and R2 and the reference

voltage is lost, however, the current restriction function activates to prevent an excessive increase of input current, enabling a

smooth rise of the output voltage.

PWM control is a continuous conduction mode, and operates at a stable switching frequency by means of an on time (ton) that is

determined by the input voltage and output voltage regardless of the load.

PWM/PFM auto switching control is a discontinuous conduction mode at light loads, and lowers the switching frequency to

reduce switching loss and improve efficiency.

The MYRGM-W series is internally fixed to PWM control.

The MYRGM-B series is internally fixed to PWM/PFM auto switching control.

Operation starts when “H” voltage is input into the CE pin. The IC can be put in the shutdown state by inputting “L” voltage into

the CE pin. In the shutdown state, the supply current of the IC is 0μA (TYP.), and the Pch MOS driver Tr. and Nch MOS switch Tr.

for synchronous rectification turn off. The CE pin is a CMOS input and the sink current is 0μA.

<UVLO>

When the VIN voltage becomes 2.00V (TYP.) or lower, the P-ch MOS driver transistor output driver transistor is forced OFF to

prevent false pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 2.10V (TYP.)

or higher, switching operation takes place. By releasing the UVLO function, the IC performs the soft start function to initiate output

startup operation. The UVLO circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended;

therefore, the internal circuitry remains in operation.

For protection against heat damage of the ICs, thermal shutdown function monitors chip temperature. The thermal shutdown

circuit starts operating and the P-ch MOS driver and N-ch MOS driver transistor will be turned off when the chip’s temperature

reaches 150℃. When the temperature drops to 120℃ (TYP.) or less after shutting of the current flow, the IC performs the soft-

start function to initiate output startup operation.

<Short-circuit protectionfunction>

The short-circuit protection circuit protects the device that is connected to this product and to the input/output in

situations such as when the output is accidentally shorted to GND. The short-circuit protection circuit monitors the output voltage,

and when the output voltage falls below the short-circuit protection threshold voltage, it turns off the Pch MOS driver Tr and

latches it. Once in the latched state, operation is resumed by turning off the IC from the CE pin and then restarting, or by re-input

into the VINpin.

MYRGM-W/B series A01 Page 9 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■OPERATIONAL EXPLANATION (Continued)

The product can quickly discharge the electric charge at the output capacitor (CL) when a low signal to the CE pin which enables

a whole IC circuit put into OFF state, is inputted via the N-ch MOS switch transistor located between the VOUT pin and the GND

pin. When the IC is disabled, electric charge at the output capacitor (CL) is quickly discharged so that it may avoid application

malfunction.

Output Voltage Dischage characteristics

R_DCHG=210Ω (TYP.)C_L=10μF

/ τ

V=V_OUT(T)× e ^{- t}

5.0

t =τLn (V_OUT(T)/ V)

4.5

Vout=1.2V

4.0

Vout=1.8V

V : Output voltage after discharge

3.5

Vout=3.3V

V_OUT(T): Outputvoltage

3.0

2.5

t : Dischargetime

2.0

τ:C_L×R_DCHG

C_L: Capacitance of Output capacitor

1.5

1.0

R_DCHG: C_Lauto-discharge resistance,

0.5

but it depends on supply voltage.

0.0

0

2

4

6

8

10 12 14 16 18 20

Discharge Time: t(ms)

■NOTE ON USE

1. For the phenomenon of temporal and transitional voltage decrease or voltage increase, the IC may be damaged or

deteriorated if IC is used beyond the absolute MAX. specifications.

2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by

external component selection, such as the coil inductance, capacitance values, and board layout of external components.

Once the design has been completed, verification with actual components should be done.

3. The DC/DC converter characteristics depend greatly on the externally connected components as well as on the characteristics

of this IC, so refer to the specifications and standard circuit examples of each component when carefully considering which

components to select. Be especially careful of the capacitor characteristics and use B characteristics (JIS standard) or X7R,

X5R (EIA standard) ceramic capacitors.

4. Sufficiently reinforce the ground wiring. In particular, reinforce near the PGND and AGND pin as fluctuations of the ground

phase due to the ground current during switching may cause the operation of the IC to become unstable.

5. Mount external components as close as possible to the IC. Keep the wiring short and thick to lower the wiring impedance.

6.A feature of High Speed Transient Response -COT control is that it controls the off time in order to control the duty, which

power loss between the input (V_INpin) and output (V_OUTpin) due to the load, and thus the switching

varies due to the effects of

frequency fluctuates. In

addition, changes in the on time due to 100% duty cycle mode are allowed. For this reason, caution

must be exercised as the characteristics of the switching frequency will vary depending on the external component

characteristics, board layout, input voltage, output voltage, load current and other parameters.

7. Due to propagation delay inside the product, the on time generated by the minimum on time generation circuit may not be the

same as the on time that is the ratio of the input voltage to the output voltage.

8. With regard to the current limiting value, the actual coil current may at times exceed the electrical characteristics due to

propagation delay inside the product.

9.The CE pin is a CMOS input pin. Do not use with the pin open. If connecting to the input or ground, use a resistor up to 1MΩ.

To prevent malfunctioning of the device connected to this product or the input/output due to short circuiting between pins, it is

recommended that a resistor be connected.

10. If the outputvoltagedropsbelowtheshortcircuit protection threshold voltageat theend of the softstartinterval, operationwill stop.

11. PWM/PFM auto switching control is a discontinuous conduction mode when the load is light, and in cases where the voltage

difference between input and output is low or the coil inductance is higher than the value indicated in the standard circuit

example, the coil current may reverse when the load is light, and thus pulse skipping will not be possible and light load

efficiency will worsen.

MYRGM-W/B series A01 Page 10 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■NOTE ON USE (Continued)

12. When the voltage difference between input voltage and output voltage is low, the load stability feature may deteriorate.

13. 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.

14. Instructions of pattern layouts

The operation may become unstable due to noise and/or phase lag from the output current when the wire impedance is high,

please place the input capacitor(C_IN) and the output capacitor (C_L) as close to the IC as possible.

(1) In order to stabilize V_INvoltage level, we recommend that a by-pass capacitor (C_IN) is connected as close as possible to the

V_INpin, PGND pin and AGND pin.

(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 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 transistors bring on heat because of the output current and ON resistance of P-channel and

N-channel MOS driver transistors. Please consider the countermeasures against heat if necessary.

(6) In the following reference pattern layout drawing, the 2-pin NC terminal is open, but it is not connected to the

IC chip.Therefore, there is no problem with connecting it to a 1-pin (Vin) or 2-pin (Lx).

C_IN2:Optional

MYRGM-W/B series A01 Page 11 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■TYPICAL PERFORMANCE CHARACTERISTICS

(1) Output Voltage vs. Output Current

MYRGM-W/MYRGM-B, V_OUT=1.8V

MYRGM-W/MYRGM-B, V_OUT=3.3V

V_IN=5.0V

2.0

1.9

1.8

1.7

1.6

3.5

3.4

3.3

3.2

3.1

MYRGM-W

V_IN=3.3V,5.0V

MYRGM-W

MYRGM-B

V_IN=3.3V,5.0V

0.1

1

10

100

1000

10000

0.1

1

10

100

1000

10000

Output Current : I_OUT(mA)

(2) Efficiency vs. Output Current

MYRGM-W/MYRGM-B, V_OUT=1.8V

MYRGM-W/MYRGM-B, V_OUT=3.3V

MYRGM-B

100

80

60

40

20

0

100

80

60

40

20

0

MYRGM-B

5.0V

V_IN=3.3V

MYRGM-W

V_IN=5.0V

1000 10000

0.1

1

10

100

1000

1

10

100

Output Current : I_OUT(mA)

(3) Ripple Voltage vs. Output Current

MYRGM-W/MYRGM-B, V_OUT=1.8V

MYRGM-W/MYRGM-B, V_OUT=3.3V

V_IN=5.0V

100

80

60

40

20

0

100

80

60

40

20

0

MYRGM-B

V_IN=3.3V,5.0V

MYRGM-W

MYRGM-B

V_IN=3.3V,5.0V

0.1

1

10

100

1000

1

10

100

1000

10000

Output Current : I_OUT(mA)

MYRGM-W/B series A01 Page 12 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(4) Output Voltage vs. AmbientTemperature

MYRGM-W/MYRGM-B,V_OUT=1.8V

2.0

MYRGM-W/MYRGM-B,V_OUT=3.3V

3.5

3.4

3.3

3.2

3.1

Vin=5.0V,Iout=1.0A

Vin=5.0V,Iout=1.5A

Vin=4.2V,Iout=1.0A

Vin=4.2V,Iout=1.5A

Vin=5.0V,Iout=1.5A

Vin=3.3V,Iout=1.0A

Vin=3.3V,Iout=1.5A

1.9

1.8

1.7

1.6

-50

-25

0

25

50

75

100 125

-50

-25

0

25

50

75

100 125

Ambient Temperature : Ta(℃)

(5) Switching Frequency vs. AmbientTemperature

MYRGM180150W31RA(V_OUT=1.8V)

3.3

MYRGM330150W31RA(V_OUT=3.3V）

Vin=5.0V

Vin=3.3V

3.2

3.1

3.0

2.9

2.8

I_OUT=300mA

2.7

-50 -25

0

25

50

75

100 125

Ambient Temperature: Ta (℃)

(6) Switching Frequency vs. Input Voltage

MYRGM180150W31RA(V_OUT=1.8V)

MYRGM330150W31RA(V_OUT=3.3V）

4.0

3.5

3.0

2.5

2.0

4.0

Ta=-40℃

Ta=25℃

Ta=-40℃

Ta=25℃

Ta=85℃

Ta=105℃

3.5

3.0

2.5

2.0

I_OUT=300mA

5.0 5.5

I_OUT=300mA

2.5

3.0

3.5

4.0

4.5

2.5

3.0

3.5

4.0

4.5

5.0

5.5

Input Voltage: V_IN(V)

MYRGM-W/B series A01 Page 13 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(7) Load Transient Response

MYRGM180150B31RA (V_IN=5V, I_OUT=1mA⇔1000mA)

MYRGM180150B31RA (V_IN=5V, I_OUT=100mA⇔1000mA)

V_OUT=1.8V

1

V_OUT=1.8V

1

I

=1mA⇔1000mA

I_OUT=100mA⇔1000mA

I_O_O_U_U_T=_T1mA⇔1000mA

2

1ch：50mV/div 2ch：500mA/div H:100us/div

1ch：50mV/div 2ch：500mA/div H：100us/div

MYRGM330150B31RA (V_IN=5V, I_OUT=100mA⇔1000mA)

MYRGM330150B31RA (V_IN=5V, I_OUT=1mA⇔1000mA)

V_OUT=3.3V

1

I_OUT=1mA⇔1000mA

I_OUT=100mA⇔1000mA

2

1ch：50mV/div 2ch：500mA/div H:100us/div

MYRGM-W/B series A01 Page 14 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■PACKAGING INFORMATION

2.5±0.1

1PININDENT

R0.05

(0.1) 0.75±0.05 (0.8)

(0.2)

L1

L2

(0.5)

4

5

6

3

2

1

7

0.25±0.05

(1.0)

0.2±0.05

1.6±0.05

●Reference Pattern Layout (unit:mm)

●Reference Metal Mask Design (unit:mm)

MYRGM-W/B series A01 Page 15 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

■MARKING RULE

① represents products series

7

MARK

PRODUCTSERIES

MYRGM-W******

MYRGM-B******

1

2

6

5

4

A

B

3

② represents integer of the referencevoltage

L1

L2

OUTPUT

MARK

PRODUCTSERIES

VOLTAGE (V)

0.X

1.X

2.X

3.X

A

B

C

D

MYRGM0******31RA

MYRGM1******31RA

MYRGM2******31RA

MYRGM3******31RA

③ represents decimal number of the referencevoltage

OUTPUT

VOLTAGE MARK

(V)

OUTPUT

VOLTAGE MARK

(V)

PRODUCT

SERIES

PRODUCT

SERIES

X.0

X.1

X.2

X.3

X.4

X.5

X.6

X.7

X.8

X.9

0

1

2

3

4

5

6

7

8

9

MYRGM*0*****31RA

MYRGM*1*****31RA

MYRGM*2*****31RA

MYRGM*3*****31RA

MYRGM*4*****31RA

MYRGM*5*****31RA

MYRGM*6*****31RA

MYRGM*7*****31RA

MYRGM*8*****31RA

MYRGM*9*****31RA

X.05

X.15

X.25

X.35

X.45

X.55

X.65

X.75

X.85

X.95

05

15

25

35

45

55

65

75

85

95

MYRGM*05150*31RA

MYRGM*15150*31RA

MYRGM*25150*31RA

MYRGM*35150*31RA

MYRGM*45150*31RA

MYRGM*55150*31RA

MYRGM*65150*31RA

MYRGM*75150*31RA

MYRGM*85150*31RA

MYRGM*95150*31RA

④⑤ represents production lot number

01～09,0A～0Z,11～9Z,A1～A9,AA～AZ, B1～ZZ in order.

(G, I, J, O, Q, W excluded)

* No character inversion used.

MYRGM-W/B series A01 Page 16 of 17

“PicoBK™” MYRGM-W／MYRGM-B series

1.5A Inductor Built-in Step-Down DC/DC Converters

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.

Manufacturing Co., Ltd. in writing in advance.

Murata Manufacturing Co., Ltd.

MYRGM-W/B series A01 Page 17 of 17


型号：	MYRGM345150B31RA
厂家：	muRata
描述：	Power Supply Module,
文件：	总17页 (文件大小：1172K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MYRGM345150B31RA [MURATA]

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