R5212D013A-TR-F--Datasheet/数据表在线中文翻译

R5212D SERIES

Step-down DC/DC Converter with VR and Reset

NO.EA-128-0510

OUTLINE

The R5212D is CMOS-based PWM step-down DC/DC converter combined with a voltage regulator (VR) and

a voltage detector (VD), with low supply current.

Each of these ICs consists of an oscillator, a PWM control circuit, a voltage reference unit, an error amplifier, a

soft-start circuit, a current limit circuit, a phase compensation circuit, a resistor net for voltage detect circuit, an

output driver transistor, and so on. A low ripple, high efficiency step-down DC/DC converter can be easily

composed of this IC with some external components, or an inductor, a diode, and capacitors.

The oscillator frequency is 1.2MHz, therefore small inductor and capacitor can be used with this IC. Further,

this IC equips the under voltage lockout function (UVLO). If the input voltage becomes equal or less than 2.35V

(Typ.), the output of DC/DC converter turns off. However, in the A/B version, embedded voltage regulator and

detector continue to operate. In the C/D version, LDO output also turns off and only the voltage detector is

working.

The voltage regulator consists of a voltage reference unit, a resistor net for voltage detect circuit, an error

amplifier, an output driver transistor, and so on.

The input source voltage of the built-in voltage regulator is V^INpin (A/B version) or VOUT1 pin, the output of

DC/DC converter (C/D version).

The built-in voltage detector supervises the input voltage and the output is N-channel open drain.

Power-on reset delay time is also included and internally set typically at 12ms (A/C version) or 50ms(B/D

version).

FEATURES

• Range of Input Voltage ............................. 3.0V~5.5V

• Built-in Soft-start Function (Typ. 1ms) and built-in power-on reset delay (Typ. 12ms or 50ms)

• Maximum Output Current...........................500mA (DC/DC), 200mA (VR)

• Accuracy Output Voltage .......................... ±2.0% (DC/DC and Voltage Regulator Output)

• Accuracy of voltage detector .................... ±2.5%

• Output Voltage (VR)(A/B Version) ............ Stepwise Setting with a step of 0.1V in the range of 2.0V to 3.6V

(C/D Version)............ Stepwise Setting with a step of 0.1V in the range of 1.2V to 3.0V

• Output Voltage (DC/DC) (A/B Version)..... Stepwise Setting with a step of 0.1V in the range of 1.2V to 3.6V

(C/D Version)..... Stepwise Setting with a step of 0.1V in the range of 2.5V to 3.6V

• Output Voltage (VD).................................. Stepwise Setting with a step of 0.1V in the range of 3.0V to 4.5V

• Package.................................................... HSON-6 (t=0.9mm)

APPLICATIONS

• Power source for hand-held communication equipment, CD or DVD drives.

• Power source for battery-powered equipment.

1

R5212D

BLOCK DIAGRAMS

R5212xxxA/B

V^IN

L^X

6

1

Current Limit

OSC

V^OUT1

4

Output Control Logic

Vref

Soft Start

Current Limit

Vref

U.V.L.O.

Delay Circuit

5

Vref

V^DOUT

3

V^OUT2

2

GND

R5212DxxxC/D

V^IN

6

1

Current Limit

& Feedback

OSC

V^OUT1

4

L^X

Output Control Logic

Vref

Soft Start

Current Limit

U.V.L.O.

Vref

Delay Circuit

5

V^OUT2

3

V^DOUT

2

GND

2

R5212D

SELECTION GUIDE

In the R5212D Series, the output voltage combination for the ICs can be selected at the user’s re-quest.

The selection can be made with designating the part number as shown below;

R5212Dxxxx-TR ←Part Number

↑ ↑

↑

a b

c

Code

Contents

a

Output Voltage Combination Code Number

Designation of Optional Function

A: VR input pin=V^INpin, VD delay=12ms

B: VR input pin=V^INpin, VD delay=50ms

C: VR input pin=DC/DC Output, VD delay=Typ. 12ms

D: VR input pin=DC/DC Output, VD delay=Typ. 50ms

b

c

Designation of Taping Type: Refer to Taping specification.

3

R5212D

PIN CONFIGURATION

HSON-6

Top View

Bottom View

6

5

4

5

6

1

2

3

2

1

PIN DESCRIPTIONS

Pin No

Symbol

LX

Pin Description

Switching Pin (P-channel open-drain output type)

Ground Pin

Output Pin of Voltage Detector (N-channel open-drain out-put type)

DC/DC converter Step-down Output monitoring Pin

Output Pin of Voltage Regulator

1

2

3

4

5

6

GND

VDOUT

VOUT1

VOUT2

VIN

Voltage Supply Pin

∗ Tab in the

parts have GND level. (They are connected to the reverse side of this IC.)

Do not connect to other wires or land patterns.

ABSOLUTE MAXIMUM RATINGS

(GND=0V)

Symbol

VIN

Item

Rating

6.5

Unit

V

VIN Pin Voltage

Lx Pin Voltage

VOUT1 Pin Voltage

VOUT2 Pin Voltage

VDOUT Pin Voltage

VLX

−0.3 ~ V^IN+0.3

−0.3 ~ 6.5

800

VOUT1

VOUT2

VDOUT

ILX

V

Lx Pin Output Current

VOUT2 Pin Output Current

Power Dissipation (On Board)

Operating Temperature Range

Storage Temperature Range

mA

mW

°C

IOUT2

PD

400

900

1

∗

Topt

Tstg

−40 ~ +85

−55 ~ +125

∗1 ) For Power Dissipation please refer to PACKAGE INFORMATION to be described.

4

R5212D

ELECTRICAL CHARACTERISTICS

• R5212DxxxA

Topt=25°C

Symbol

VIN

IDD

VUVLO2

Item

Operating Input Voltage

Supply Current

Conditions

Min.

3.0

Typ.

Max.

5.5

800

2.65

Unit

V

µA

V

400

2.50

V^IN=5.0V, VOUT1=0V

UVLO Release Voltage

2.35

0.05

UVLO Detector Threshold

VUVLOHYS

0.15

0.25

V

Voltage Hysteresis

• DC/DC Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

V^OUT1

V^IN=5.0V, at no load

VOUT1

DC/DC Output Voltage

V

OPEN LOOP

×0.98

×1.02

ppm

∆VOUT1/

DC/DC Output Voltage

Temperature Coefficient

40°C Topt 85°C

±100

=

/°C

∆Topt

fosc

RLX

ILXleak

ILXLIM

Oscillator Frequency

Lx on Resistance

Lx Leakage Current

Lx Current Limit

960

1200

0.4

0.01

800

1440

0.8

5.00

kHz

Ω

V^IN=5.0V

V^IN=5.0V, ILX=100mA

V^IN=VOUT1=5.5V, VLX=0V

V^IN=5.0V

µA

mA

%

600

100

0.35

Maxduty Maximum duty cycle

Soft-start Time

tstart

1.00

3.00

ms

V^IN=5.0V

• VR Part

Topt=25°C

Symbol

Item

Conditions

V^IN=5.0V, IOUT2=10mA

V^IN=5.0V

Min.

Typ.

Max.

Unit

V^OUT2

VOUT2

VR Output Voltage

V

×0.98

×1.02

IOUT2

Maximum Output Current of VR

VR Load Regulation

200

mA

mV

1^Vm^IN−A^VOUI^TO²⁼UT⁰2^V80mA

VREG2

20

60

=

VDIF2

ILIM2

Dropout Voltage

Short Current Limit

0.2

50

0.3

V

mA

I^OUT2=100mA

V^OUT2=0V

ppm

∆VOUT2/

VR Output Voltage

40°C Topt 85°C

±100

=

Temperature Coefficient

/°C

∆Topt

• VD Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

−V^DET

VD Detector Threshold

V

−VDET

×0.975

×1.025

ppm

∆−VDET/

VD Detector Threshold

Temperature Coefficient

40°C Topt 85°C

±100

=

/°C

∆Topt

−V^DET

×0.05

12

VHYS

Hysteresis Range

V

VD Output Delay Time for Release

VDOUT “L” Output Current

tPLH

IDOUTL

3

2

30

20

ms

mA

VIN=VDOUT=−VDET×0.9 to 5.0

V^IN=2.0V, IOUT=0.1V

7

5

R5212D

• R5212DxxxB

Topt=25°C

Symbol

Item

Conditions

Min.

3.0

Typ.

Max.

5.5

Unit

V

VIN

Operating Input Voltage

IDD

VUVLO2

Supply Current

UVLO Release Voltage

400

2.50

800

2.65

V^IN=5.0V, VOUT1=0V

µA

V

2.35

0.05

UVLO Detector Threshold

VUVLOHYS

0.15

0.25

V

Voltage Hysteresis

• DC/DC Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

V^OUT1

V^IN=5.0V, at no load

VOUT1

DC/DC Output Voltage

V

OPEN LOOP

×0.98

×1.02

ppm

∆VOUT1/

DC/DC Output Voltage

Temperature Coefficient

40°C Topt 85°C

±100

=

/°C

∆Topt

fosc

RLX

ILXleak

ILXLIM

Oscillator Frequency

Lx on Resistance

Lx Leakage Current

Lx Current Limit

960

1200

0.4

0.01

850

1440

0.8

5.00

kHz

Ω

V^IN=5.0V

V^IN=5.0V, ILX=100mA

V^IN=VOUT1=5.5V, VLX=0V

V^IN=5.0V

µA

mA

%

600

100

0.35

Maxduty Maximum duty cycle

Soft-start Time

tstart

1.00

3.00

ms

V^IN=5.0V

• VR Part

Topt=25°C

Symbol

Item

Conditions

V^IN=5.0V, IOUT2=10mA

V^IN=5.0V

Min.

Typ.

Max.

Unit

V^OUT2

VOUT2

VR Output Voltage

V

×0.98

×1.02

IOUT2

Maximum Output Current of VR

VR Load Regulation

200

mA

mV

1^Vm^IN−A^VOUI^TO²⁼UT⁰2^V80mA

VREG2

20

60

=

VDIF2

ILIM2

Dropout Voltage

Short Current Limit

0.2

50

0.3

V

mA

I^OUT2=100mA

V^OUT2=0V

ppm

∆VOUT2/

VR Output Voltage

40°C Topt 85°C

±100

=

Temperature Coefficient

/°C

∆Topt

• VD Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

−V^DET

VD Detector Threshold

V

−VDET

×0.975

×1.025

ppm

∆−VDET/

VD Detector Threshold

Temperature Coefficient

40°C Topt 85°C

±100

=

/°C

∆Topt

−V^DET

×0.05

VHYS

Hysteresis Range

V

VD Output Delay Time for

Release

VDOUT “L” Output Current

tPLH

3

2

12

7

30

20

ms

V^IN=VDOUT=−VDET×0.9 to 5.0

V^IN=2.0V, VDOUT=0.1V

IDOUTL

mA

6

R5212D

• R5212DxxxC

Topt=25°C

Symbol

Item

Conditions

Min.

3.0

Typ.

Max.

5.5

Unit

V

VIN

Operating Input Voltage

IDD

VUVLO2

Supply Current

UVLO Release Voltage

400

2.50

800

2.65

V^IN=5.0V, VOUT1=0V

µA

V

2.35

0.05

UVLO Detector Threshold

VUVLOHYS

0.15

0.25

V

Voltage Hysteresis

• DC/DC Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

V^OUT1

V^IN=5.0V, at no load

VOUT1

DC/DC Output Voltage

V

OPEN LOOP

×0.98

×1.02

ppm

∆VOUT1/

DC/DC Output Voltage

Temperature Coefficient

40°C Topt 85°C

±100

=

/°C

∆Topt

fosc

RLX

ILXleak

ILXLIM

Oscillator Frequency

Lx on Resistance

Lx Leakage Current

Lx Current Limit

960

1200

0.4

0.01

850

1440

0.8

5.00

kHz

Ω

V^IN=5.0V

V^IN=5.0V, ILX=100mA

V^IN=VOUT1=5.5V, VLX=0V

V^IN=5.0V

µA

mA

%

600

100

0.35

Maxduty Maximum duty cycle

Soft-start Time

tstart

1.00

3.00

ms

V^IN=5.0V

• VR Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

V^OUT2

V^OUT1=3.3V

VOUT2

VR Output Voltage

V

×0.98

×1.02

I^OUT2=10mA

IOUT2

Maximum Output Current of VR

VR Load Regulation

200

mA

mV

V^IN=5.0V

1^Vm^IN−A^VOUI^TO²⁼UT⁰2^V80mA

VREG2

20

60

=

VDIF2

ILIM2

Dropout Voltage

Short Current Limit

0.2

50

0.3

V

mA

IOUT2=100mA

V^OUT2=0V

ppm

∆VOUT2/

VR Output Voltage

40°C Topt 85°C

±100

=

Temperature Coefficient

/°C

∆Topt

• VD Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

−V^DET

VD Detector Threshold

V

−VDET

×0.975

×1.025

ppm

∆−VDET/

VD Detector Threshold

Temperature Coefficient

40°C Topt 85°C

±100

=

/°C

∆Topt

−V^DET

×0.05

VHYS

Hysteresis Range

V

VD Output Delay Time

for Release

VDOUT “L” Output Current

tPLH

3

2

12

7

30

20

ms

V^IN=VDOUT=−VDET×0.9 to 5.0

V^IN=2.0V, VDOUT=0.1V

IDOUTL

mA

7

R5212D

• R5212DxxxD

Topt=25°C

Symbol

Item

Conditions

Min.

3.0

Typ.

Max.

5.5

Unit

V

VIN

Operating Input Voltage

IDD

VUVLO2

Supply Current

UVLO Release Voltage

400

2.50

800

2.65

V^IN=5.0V, VOUT1=0V

µA

V

2.35

0.05

UVLO Detector Threshold

VUVLOHYS

0.15

0.25

V

Voltage Hysteresis

• DC/DC Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

V^OUT1

V^IN=5.0V, at no load

VOUT1

DC/DC Output Voltage

V

OPEN LOOP

×0.98

×1.02

ppm

∆VOUT1/

DC/DC Output Voltage

Temperature Coefficient

40°C Topt 85°C

±100

=

/°C

∆Topt

fosc

RLX

ILXleak

ILXLIM

Oscillator Frequency

Lx on Resistance

Lx Leakage Current

Lx Current Limit

960

1200

0.4

0.01

850

1440

0.8

5.00

kHz

Ω

V^IN=5.0V

V^IN=5.0V, ILX=100mA

V^IN=VOUT1=5.5V, VLX=0V

V^IN=5.0V

µA

mA

%

600

100

0.35

Maxduty Maximum duty cycle

Soft-start Time

tstart

1.00

3.00

ms

V^IN=5.0V

• VR Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

V^OUT2

V^OUT1=3.3V

VOUT2

VR Output Voltage

V

×0.98

×1.02

I^OUT2=10mA

IOUT2

Maximum Output Current of VR

VR Load Regulation

200

mA

mV

V^IN=5.0V, VOUT1=3.3V

1^Vm^IN−A^VOUI^TO²⁼UT⁰2^V80mA

VREG2

20

60

=

VDIF2

ILIM2

Dropout Voltage

Short Current Limit

0.2

50

0.3

V

mA

IOUT2=100mA

V^OUT2=0V

ppm

∆VOUT2/

VR Output Voltage

40°C Topt 85°C

±100

=

Temperature Coefficient

/°C

∆Topt

• VD Part

Topt=25°C

Symbol

Item

Conditions

Min.

Typ.

Max.

Unit

−V^DET

VD Detector Threshold

V

−VDET

×0.975

×1.025

ppm

∆−VDET/

VD Detector Threshold

Temperature Coefficient

40°C Topt 85°C

±100

=

/°C

∆Topt

−V^DET

×0.05

VHYS

Hysteresis Range

V

VD Output Delay Time for

Release

VDOUT “L” Output Current

tPLH

10

2

50

7

120

20

ms

V^IN=VDOUT=−VDET×0.9 to 5.0

V^IN=2.0V, VDOUT=0.1V

IDOUTL

mA

8

R5212D

TYPICAL APPLICATION AND APPLICATION HINTS

R5212Dxxxx

3

C

1

R

OUT2

V

OUT2

V

DOUT

V

OUT1

V

IN

V

1

C

DOUT

V

GND

X

L

2

C

1

L

OUT1

V

1

D

Examples of Components

Symbol

Item

<

(VOUT1

1.6V)

LQH43C Series

VLP5610 Series

LQH43C Series

VLP5610 Series

Murata

TDK

Murata

TDK

4.7µH

=

4.7µH

6.8µH

L1

(VOUT1 > 1.6V)

D1

R1

C1

C2

C3

RB491D(ROHM) or EP05Q03 (Nihon Inter)

50kΩ

10µF Ceramic Capacitor

2.2µF Ceramic Capacitor

9

R5212D

When you use these ICs, consider the following issues;

Set external components as close as possible to the IC and minimize the connection between the components

and the IC. In particular, a capacitor should be connected to between V^INand GND with the minimum connection.

Make sufficient grounding, and reinforce supplying. A large switching current may flow through the connection of

power supply, an inductor and the connection of V^OUT1. If the impedance of the connection of power supply or

ground is high, the voltage level of power supply of the IC fluctuates with the switching current. This may cause

unstable operation of the IC.

Use a capacitor with a capacity of 10µF or more for V^INand GND, and with low ESR ceramic type. In terms of

V^OUT1, use a ceramic capacitor with a capacity of 10µF or more. For VOUT2 pin, use a ceramic capacitor with a

capacitance of 2.2µF or around.

Choose an inductor that has a small D.C. resistance and large allowable current and which is hard to reach

magnetic saturation. If the value of inductance of an inductor is extremely small, the IL^X, which flows through Lx

transistor and an inductor, may exceed the absolute maximum rating at the maximum loading.

Use an inductor with appropriate inductance.

Use a diode of a Schottky type with high switching speed, and also pay attention to its current capacity.

If the spike noise of Lx pin is too large, make snub circuit (such as serial connection of CR) between Lx and

GND, then the noise will be reduced. The time constant of the CR depends on the actual PCB, so evaluate it on

the actual PCB.

If the load current of the voltage regulator is small, because of the switching noise of DC/DC converter, the

output voltage of V^OUT2may be large. To avoid this, use the voltage regulator with a load current at least 0.5mA.

In terms of LDO, the difference between the set output voltage and input voltage should be 0.5V or more,

The performance of power source circuits using these ICs extremely depends upon the peripheral circuits.

Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that

the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed their

respected rated values.

10

R5212D

OPERATION of step-down DC/DC converter and Output Current

The step-down DC/DC converter charges energy in the inductor when Lx transistor is ON, and discharges the

energy from the inductor when Lx transistor is OFF and controls with less energy loss, so that a lower output

voltage than the input voltage is obtained. The operation will be explained with reference to the following

diagrams:

IL

ILmax

i1

I

OUT

ILxmin

topen

L

Lx Tr

SD

VIN

VOUT

i2

CL

ton

toff

t=1/fosc

Step 1 : Lx Tr. turns on and current IL (=i1) flows, and energy is charged into CL. At this moment,

IL increases from ILmin (=0) to reach ILmax in proportion to the on-time period (ton) of L^XTr.

Step 2 : When Lx Tr. turns off, Schottky diode (SD) turns on in order that L maintains IL at ILmax,

and current IL (=i2) flows.

Step 3 : IL decreases gradually and reaches ILmin after a time period of topen, and SD turns off,

provided that in the continuous mode, next cycle starts before IL becomes to 0 because toff time is not

enough. In this case, IL value is from this ILmin (>0).

In the case of PWM control system, the output voltage is maintained by controlling the on-time period (ton),

with the oscillator frequency (fosc) being maintained constant.

11

R5212D

• Discontinuous Conduction Mode and Continuous Conduction Mode

The maximum value (ILmax) and the minimum value (ILmin) current which flow through the inductor is the

same as those when Lx Tr. turns on and when it turns off.

The difference between ILmax and ILmin, which is represented by ∆I;

∆I=ILmax−ILmin=VOUT×topen/L=(VIN−VOUT)×ton/L ........................................................Equation 1

Where, t=1/fosc=ton+toff

duty (%)=ton/t×100=ton×fosc×100

<

topen toff

=

In Equation A, VOUT×topen/L and (VIN−VOUT) ×ton/L are respectively shown the change of the current at ON,

and the change of the current at OFF.

When the output current (I^OUT) is relatively small, topen < toff as illustrated in the above diagram. In this case,

the energy is charged in the inductor during the time period of ton and is discharged in its entirely during the time

period of toff, therefore ILmin becomes to zero (ILmin=0). When I^OUTis gradually increased, eventually, topen

becomes to toff (topen=toff), and when I^OUTis further increased, ILmin becomes larger than zero (ILmin>0). The

former mode is referred to as the discontinuous mode and the latter mode is referred to as continuous mode.

In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc

tonc=t×VOUT/VIN .............................................................................................................Equation 2

When ton<tonc, the mode is the discontinuous mode, and when ton=tonc, the mode is the continuous mode.

OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS

When Lx Tr. is “ON”:

(Wherein, Ripple Current P-P value is described as I^RP, ON resistance of LX Tr. is described as RP the direct

current of the inductor is described as R^L. The threshold level of Shottky diode is described as VF.)

VIN=VOUT+(RP+RL)×IOUT+L×IRP/ton..................................................................................Equation 3

When Lx Tr. is “OFF”:

L×IRP/toff=VF+VOUT+RL×IOUT ...........................................................................................Equation 4

Put Equation 4 to Equation 3 and solve for ON duty, ton/(toff+ton)=DON,

DON=(VOUT+VF+RL×IOUT)/(VIN+VF−RP×IOUT)......................................................................Equation 5

Ripple Current is as follows;

IRP=(VIN−VOUT−RP×IOUT−RL×IOUT)×DON/f/L .......................................................................Equation 6

Wherein, peak current that flows through L, Lx Tr., and SD is as follows;

ILmax=IOUT+IRP/2...........................................................................................................Equation 7

Consider ILmax, condition of input and output and select external components.

ÌThe above explanation is directed to the calculation in an ideal case in continuous mode.

12

R5212D

Timing Chart

• R5212DxxxA/B

(-VDET+VHYS

)

-VDET

V

UVLO2

UVLO1

V

IN Voltage

Soft-start

Time

OUT1 Voltage

LX

Voltage

VD Delay

for Release

VD Delay

for Release

VDOUT Voltage

V

OUT2 Voltage

13

R5212D

• R5212DxxxC/D

DET

HYS

(-V +V

)

DET

-V

UVLO2

V

UVLO1

Soft-start

Time

IN

V Voltage

OUT1

V

Voltage

x

L Voltage

VD Delay

For Release

DOUT

V

Voltage

OUT2

V

Voltage

The timing chart which is shown in the previous page describes the relation of supply voltage changes with

time and each output of DC/DC converter, voltage detector, and voltage regulator.

(1) DC/DC converter

When the power turns on and in the case of rising the VIN voltage, while the VIN voltage is at UVLO release

level (V^UVLO2) or less, the operation of the DC/DC converter stops and does not make switching, therefore VOUT1

voltage does not rise.

When the V^INvoltage becomes UVLO release level or more, the DC/DC converter starts soft-start operation,

and start switching, then V^OUT1will rise. After the soft-start time, if VIN voltage becomes set VOUT1 level or more,

V^OUT1will be settled at VOUT1 set output voltage. If VIN voltage becomes UVLO detector threshold level (VUVLO1) or

less, the DC/DC converter stops switching then Lx transistor in the IC turns off.

(2) Voltage Detector

If the VIN voltage is at VD detector threshold level or less, the N-channel transistor of VDOUT pin turns on and

outputs “L” to V^DOUTpin. Then, when the VIN voltage becomes VD detector threshold level + its hysteresis range

(−V^DET+VHYS ) or more, after VD delay for release (tPLH) passing, the N-channel transistor inside the IC turns off,

V^DOUTpin voltage reaches to the pull-up voltage. Besides, the release circuit for VD starts from when VIN voltage

reaches (−V^DET+VHYS ).

14

R5212D

(3)Voltage Regulator

• R5212DxxxA/B

The voltage regulator always operates even if UVLO function would work. Therefore, VOUT2 voltage is nearly

equal to V^INvoltage. Actual value depends on the load current. When the VIN voltage becomes set VOUT2 voltage

or more, V^OUT2voltage will be the set output voltage. The short current limit can operate after soft-start time.

• R5212DxxxC/D

VOUT1 voltage is the input voltage for the built-in LDO, when the VOUT1 voltage is equal or less than VOUT2 set

voltage, V^OUT2voltage is depending on the load current for VOUT2, however almost same as VOUT1 Voltage. When

the V^OUT1voltage is equal or more than set VOUT2 voltage, VOUT2 voltage becomes the set output voltage. Short

Current Limit works after soft-start operation.

TEST CIRCUITS

OSCILLOSCOPE

VIN

LX

A

VOUT1

GND

Supply Current

UVLO Detector Threshold/ Released Voltage

VIN

L

X

VIN

LX

A

VOUT1

V

GND

Lx Leakage Current

Lx On Resistance

OSCILLOSCOPE

V

IN

LX

VIN

LX

V

OUT1

OUT2

VOUT1

GND

Lx Current Limit

V^OUT1Output Voltage

15

R5212D

OSCILLOSCOPE

V

OUT1

VIN

LX

VOUT1

GND

Oscillator Frequency, Soft-start Time

V

IN

LX

VIN

LX

VOUT1

V

OUT1

VOUT2

GND

VDOUT

GND

V

I

OUT2

OSCILLOSCOPE

V^OUT2Output Voltage, Load Regulation, Dropout

Voltage, Current Limit, Short Current Limit

VDOUT Detector Threshold, Hysteresis Range,

VD Output Delay Time for Release

VIN

V

OUT1

GND VDOUT

A

V^DOUT“L” Output Current

16

R5212D

TYPICAL CHARACTERISTICS

1) DC/DC Output Voltage vs. Output Current (Topt=25°C)

R5212D011A

R5212D014C

1.63

1.62

1.61

1.60

1.59

1.58

3.36

3.34

3.32

3.30

3.28

3.26

3.24

VIN=4.0V

VIN=5.0V

VIN=5.5V

V

IN=4.0V

IN=5.0V

IN=5.5V

0

100

200

300

400

500

0

100

200

300

400

500

Output Current I^OUT1(mA)

2) Efficiency vs. Output Current (Topt=25°C)

R5211D011A

R5211D014C

V

OUT1=1.6V

V

OUT1=3.3V

90

80

70

60

50

40

30

20

10

0

100

90

80

70

60

50

40

30

20

10

0

V

IN=4.0V

IN=5.0V

IN=5.5V

V

IN=4.0V

IN=5.0V

IN=5.5V

0.1

1

10

100

1000

0.1

1

10

100

1000

Output Current I^OUT1(mA)

3) VR Output Voltage vs. Output Current (Topt=25°C)

R5212D011A

VIN=5V

2.65

2.63

2.61

2.59

2.57

2.55

3.0

2.5

2.0

1.5

1.0

0.5

0

50

100

150

200

0

100

200

300

400

500

Output Current I^OUT2(mA)

17

R5212D

R5212D011A

VIN=5V

3.0

2.5

2.0

1.5

1.0

0.5

0

-40°C

25°C

85°C

0

100

200

300

400

500

Output Current I^OUT2(mA)

4) DC/DC Output Voltage vs. Temperature

R5212D011A

5) VR Output Voltage vs. Temperature

R5212D011A

VIN=5V OpenLooP

VIN=5V IOUT2=10mA

1.70

1.65

1.60

1.55

1.50

2.70

2.65

2.60

2.55

2.50

-50

0

50

100

-50

0

50

100

Temperature Topt(°C)

6) VD Detector Threshold vs. Temperature

R5212D011A

7) VD Released Delay Time vs. Temperature

R5212D

VIN=5V

50

45

40

35

30

4.40

4.35

4.30

4.25

4.20

4.15

4.10

4.05

4.00

B/D version

25

20

15

10

5

A/C version

50

0

-50

0

50

100

-50

0

100

Temperature Topt(°C)

18

R5212D

8) Soft-start time vs. Temperature

R5212D011A

9)Frequency vs. Temperature

R5212D011A

VIN=5V

2.0

1.5

1.0

0.5

0.0

1350

1300

1250

1200

1150

1100

1050

-50

0

50

100

-50

0

50

100

Temperature Topt(°C)

10) Supply Current vs. Temperature

R5212D011A

11) ON Resistance vs. Temperature

R5212D011A

VIN=5V

400

380

360

340

320

300

1.0

0.8

0.6

0.4

0.2

0.0

-50

0

50

100

-50

0

50

100

Temperature Topt(°C)

12) UVLO Released Voltage vs. Temperature 13) Lx Current Limit vs. Temperature

R5212D011A

VIN=5V

2.70

2.60

2.50

2.40

2.30

1000

900

800

700

600

500

-50

0

50

100

-50

0

50

100

Temperature Topt(°C)

19

R5212D

14) Soft-start Output Waveform (Topt=25°C)

R5212D011A

V

IN=5V

10

8

6

4

2

0

V

IN

6

V

OUT2

OUT1

4

2

0

-0.5

0

0.5

1

1.5

2

Time (ms)

15) VD Released Delay Waveform (Topt=25°C)

R5212D011A

15

10

5

10

5

V

IN

0

V

DOUT

0

-10

-5

0

5

10

Time (ms)

15

20

25

30

16) DC/DC Load Transient Response 1 (Topt=25°C)

R5212D011A

L=4.7µH, C1=C2=10µF, VIN=5V

1.7

1000

800

600

400

200

0

V

OUT1

1.6

1.5

1.4

1.3

1.2

I

OUT1:10mA→200mA

-20

0

20

40

60

80

100

Time (µs)

20

R5212D

R5212D014C

L=10µH, C1=C2=10µF, VIN=5V

3.4

3.3

3.2

3.1

3.0

2.9

1000

800

600

400

200

0

V

OUT1

IOUT1:10mA→200mA

-20

0

20

40

60

80

100

Time (µs)

R5212D011A

L=4.7µH, C1=C2=10µF, VIN=5V

1.8

1.7

1.6

1.5

1.4

1.3

1000

800

600

400

200

0

V

OUT1

I

OUT1:200mA→10mA

-100

0

100

200

300

400

Time (µs)

R5212D014C

L=10µH, C1=C2=10µF VIN=5V

3.5

3.4

3.3

3.2

3.1

3.0

1000

800

600

400

200

0

V

OUT1

IOUT1:200mA→10mA

-100

0

100

200

300

400

600

700

800

Time (µs)

21

R5212D

17) VR Load Transient Response (Topt=25°C)

R5212D011A

C1=C2=10µF, C3=2.2µF VIN=5V

2.63

2.62

2.61

2.60

2.59

2.58

2.57

2.56

2.55

2.54

900

800

700

600

500

400

300

200

100

0

I

OUT2:10mA→150mA

-4

-2

0

2

4

6

8

10

Time (µs)

18) DC/DC, VR Ripple Waveform (C=10µF, VIN=5V, IOUT1=280mA, IOUT2=150mA, Topt=25°C)

R5212D011A

L=4.7µH, VOUT1=1.6V, VOUT2=2.6V

30

20

10

100

90

80

70

60

50

40

30

20

10

0

DC/DC

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

VR

-10

-20

-30

-0.5

0

0.5

1

1.5

2

Time (µs)

R5212D014C

L=10µH, VOUT1=3.3V, VOUT2=2.5V

50

40

30

20

10

100

90

80

70

60

50

40

30

20

10

0

-10

-20

-30

-40

-50

DC/DC

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

VR

-0.5

0

0.5

1

1.5

2

Time (µs)

22

R5212D

19) DC/DC Output Voltage vs. Input Voltage (Topt=25°C)

R5212D011A

R5212D014C

IOUT1=10mA

1.62

1.61

1.60

1.59

1.58

3.31

3.30

3.29

3.28

3.27

3

3.5

4

4.5

5

5.5

3.5

4

4.5

5

5.5

Input Voltage V^IN(V)

20) VR Output Voltage vs. Input Voltage (Topt=25°C)

R5212D011A

IOUT2=10mA

2.65

2.63

2.61

2.59

2.57

2.55

3

3.5

4

4.5

5

5.5

Input Voltage V^IN(V)

23

PE-HSON-6-0510

PACKAGE INFORMATION

• HSON-6

Unit: mm

PACKAGE DIMENSIONS

2.9 0.2

(1.5)

0.5TYP

4

6

3

1

Bottom View

Attention: Tabs or Tab suspension leads in the

parts have V^DDor GND level.(They are

connected to the reverse side of this IC.)

Refer to PIN DESCRIPTIONS.

0.1

0.95

Do not connect to other wires or land patterns.

0.3 0.1

M

TAPING SPECIFICATION

4.0 0.1

+0.1

0

∅1.5

2.0 0.05

0.2 0.1

3.3

4.0 0.1

2.0MAX.

∅1.1 0.1

TR

User Direction of Feed

TAPING REEL DIMENSIONS

(1reel=3000pcs)

11.4 1.0

9.0 0.3

2 0.5

21 0.8

PE-HSON-6-0510

PACKAGE INFORMATION

POWER DISSIPATION (HSON-6)

This specification is at mounted on board. Power Dissipation (PD) depends on conditions of mounting on board.

This specification is based on the measurement at the condition below:

Measurement Conditions

Standard Land Pattern

Environment

Board Material

Board Dimensions

Copper Ratio

Mounting on Board (Wind velocity=0m/s)

Glass cloth epoxy plactic (Double sided)

40mm × 40mm × 1.6mm

Top side : Approx. 50% , Back side : Approx. 50%

Through-hole

φ0.5mm × 44pcs

Measurement Result

(Topt=25°C,Tjmax=125°C)

Standard Land Pattern

900mW

Free Air

400mW

Power Dissipation

Thermal Resistance

θja=(125−25°C)/0.9W=111°C/W

250°C/W

1200

1100

1000

900

800

700

600

500

400

300

200

100

0

On Board

40

Free Air

0

25

50

75 85 100

125

150

Ambient Temperature (°C)

Power Dissipation

Measurement Board Pattern

IC Mount Area Unit : mm

RECOMMENDED LAND PATTERN

0.35

0.95

1.6

(Unit: mm)

ME-R5212D-0510

MARK INFORMATION

R5212D SERIES MARK SPECIFICATION

• HSON-6

1

5

4

to : Product Code (refer to Part Number vs. Product Code)

6

,

: Lot Number

1

4

2

5

3

6

• Part Number vs. Product Code

Product Code

Part Number

1

2

3

4

R5212D011A

R5212D014C

R5212D017A

R5212D016B

D

1

4

7

6

A

C

A

B