XC9509L256AL_技术文档

XC9509Series

ETR1006_001

Synchronous Step-Down DC/DC Converter

with Built-In LDO Regulator in Parallel Plus Voltage Detector

■GENERAL DESCRIPTION

The XC9509 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in parallel with the

DC/DC converter's output. A voltage detector is also built-in. Since the input for the LDO voltage regulator block comes

from the input power supply, it is suited for use with various applications.

The DC/DC converter block incorporates a P-channel driver transistor and a synchronous N-channel switching transistor.

With an external coil, diode and two capacitors, the XC9509 can deliver output currents up to 600mA at efficiencies over 90%.

The XC9509 is designed for use with small ceramic capacitors.

A choice of three switching frequencies are available, 300kHz, 600kHz, and 1.2MHz. Output voltage settings for the DC/DC

and VR are set-up internally in 100mV steps within the range of 0.9V to 4.0V (± 2.0%). For the VD, the range is of 0.9V to

5.0V (± 2.0%). The soft start time of the series is internally set to 5ms. With the built-in U.V.L.O. (Under Voltage Lock Out)

function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.4 V or lower. The functions of

the MODE pin can be selected via the external control pin to switch the DC/DC control mode and the disable pin to shut down

either the DC/DC block or the regulator block.

■APPLICATIONS

●CD-R / RW, DVD

■FEATURES

Input Voltage Range : 2.4V ~ 6.0V

Low ESR Capacitor

VD Function

: Ceramic capacitor compatible

●HDD

: Sense internally either VDD, DCOUT,

or VROUT. N-ch open drain output

: MSOP-10, USP-10

●PDAs, portable communication modem

●Cellular phones

Small Package

●Palmtop computers

●Cameras, video recorders

Output Voltage Range : 0.9V ~ 4.0V (Accuracy±2%)

Output Current

: 600mA (for MSOP-10 package)

400mA (for USP-10 package)

: PWM or PWM/PFM Selectable

Control Method

Oscillation Frequency : 300kHz, 600kHz, 1.2MHz

Reglator Output

: Parallel Input to DC/DC Converter

Output Voltage Range : 0.9V ~ 4.0V (Accuracy±2%)

Current Limit

: 300mA

Dropout Voltage

: 80mV @ IOUT=100mA (VOUT=2.8V)

High Ripple Rejection : 60dB @1kHz (VOUT=2.8V)

■TYPICAL PERFORMANCE

■TYPICAL APPLICATION CIRCUIT

CHARACTERISTICS

XC9509Hxxxx

VIN=3.6V, Topr=25℃, L=4.7μH (CDRH4D28C),

CIN:4.7μF (ceramic), CL1:10μF (ceramic), CL2: 4.7μF (ceramic)

MSOP-10 (TOP VIEW)

* Please refer to the typical application circuit when

external components are selected.

1/41

XC9509 Series

■PIN CONFIGURATION

■PIN ASSIGNMENT

PIN NUMBER PIN NAME

FUNCTION

Power Ground

Chip Enable

1

2

PGND

CE

3

PVDD

AVDD

VDOUT

AGND

MODE

VROUT

Power Supply 1

Power Supply 2

VD Input

4

5

MSOP-10 (TOP VIEW)

6

Analog Ground

Mode Switch

VR Output

7

8

9

DCOUT

DC/DC Output Sense

Switch

10

LX

USP-10 (BOTTOM VIEW)

*The dissipation pad for the USP-10 package

should be solder-plated in recommended

mount pattern and metal masking so as to

enhance mounting strength and heat release.

If the pad needs to be connected to other pins,

it should be connected to the AGND pin.

■PRODUCT CLASSIFICATION

●Ordering Information

XC9509①②③④⑤⑥

: The input for the voltage regulator block comes from VDD.

DESIGNATOR

DESCRIPTION

SYMBOL

DESCRIPTION

Control Methods, the

MODE Pin, & the VD

Sense Pin

①

As chart below : -

Setting Voltage &

Specifications

Internal

standard

: Setting voltage and specifications of each DC/DC, VR,

and VD (Based on the internal standard)

②③

3

6

: 300kHz

DC/DC Oscillation

Frequency

④

: 600kHz

C

A

D

R

L

: 1.2MHz

Package &

: MSOP-10, Current limiter: 1.1A (TYP.)

: USP-10, Current limiter: 0.7A (TYP.)

: Embossed Tape, standard feed

: Embossed Tape, reverse feed

⑤

⑥

DC/DC Current Limit

Device Orientation

●Control Methods, MODE Pins, VD SENSE Pins

MODE PINS

(H LEVEL)

MODE PINS

(L LEVEL)

SERIES

①

DC/DC CONTROL METHODS

VD SENSE

A

B

C

D

E

F

VDD

DCOUT

VROUT

VDD

VR: OFF

VR: ON

PWM Control

XC9509

DC/DC: OFF

DC/DC: ON

DCOUT

VROUT

VDD

H

PWM, PFM/PWM Manual

Switch

PFM/PWM Auto

Switch

PWM Control

K

L

DCOUT

VROUT

* The XC9509A to F series' MODE pin switches either the regulator block or DC/DC block to stand-by mode.

When the CE mode is off, every function except for the VD function enters into the stand-by mode.

(The MODE pin does not operate independently.)

2/41

XC9509

Series

■BLOCK DIAGRAM

PVDD

Phase

Compensation

DCOUT

-

+

-

Buffer,

Driver

logic

+

Current

Limit & Feedback

LX

Vrefw ith

softstart

PWM/PFM

Controller

Ramp Wave

Generator,

OSC

ON/OFF

Control

each circuit

CE

PGND

MODE

Control

each circuit

AVDD

VROUT

-

Current

Limit

U.V.L.O

+

-

VDOUT

+

-

Vref

SENSE

(VDD or DCOUT or VROUT)

AGND

* Diodes shown in the above circuit are protective diodes.

■ABSOLUTE MAXIMUM RATINGS

Ta = 25℃

PARAMETER

AVDD Pin Voltage

PVDD Pin Voltage

DCOUT Pin Voltage

VROUT Pin Voltage

VROUT Pin Current

VDOUT Pin Voltage

VDOUT Pin Current

Lx Pin Voltage

SYMBOL

AVDD

PVDD

DCOUT

VROUT

IROUT

VDOUT

IVD

RATINGS

- 0.3 ~ 6.5

UNIT

V

AVDD - 0.3 ~ AVDD + 0.3

- 0.3 ~ AVDD + 0.3

800

V

mA

V

- 0.3 ~ AVDD + 0.3

50

mA

V

Lx

- 0.3 ~ AVDD + 0.3

1300

MSOP-10

USP-10

CE Pin Voltage

MODE Pin Voltage

MSOP-10

USP-10

Lx Pin Current

ILx

mA

900

CE

- 0.3 ~ AVDD + 0.3

350 (*)

V

MODE

Power Dissipation

Pd

mW

150

Operating Temperature Range

Storage Temperature Range

Topr

Tstg

- 40 ~ + 85

℃

- 55 ~ + 125

(*) When PC board mounted.

3/41

XC9509 Series

■ELECTRICAL CHARACTERISTICS

XC9509xxxCAx

●Common Characteristics

Topr=25℃

CIRCUIT

PARAMETER

SYMBOL

CONDITIONS

VIN=CE=DCOUT=5.0V

VIN=CE=5.0V, DCOUT=0V

VIN=6.5V, CE=0V

MIN.

-

TYP.

MAX.

310

360

7.0

UNITS

μA

V

Supply Current 1

IDD1

IDD2

ISTB

VIN

250

1

-

Supply Current 2

-

300

Stand-by Current (*1)

Input Voltage Range

CE ‘H’ Level Voltage

CE ‘L’ Level Voltage

CE ‘H’ Level Current

CE ‘L’ Level Current

-

3.0

2.4

0.6

VSS

- 0.1

-

6.0

VCEH

VCEL

ICEH

ICEL

VDD

0.25

0.1

V

3

1

V

μA

0.1

MODE 'H' Level Voltage

*XC9509A/B/C

MODE 'H' Level Voltage

*XC9509D/E/F/H/K/L

MODE 'L' Level Voltage

*XC9509A/B/C

VMH

VML

0.6

-

VDD

0.25

V

2

3

2

3

VSS

MODE 'L' Level Voltage

*XC9509D/E/F/H/K/L

MODE 'H' Level Current

MODE 'L' Level Current

IMH

IML

- 0.1

-

0.1

μA

1

●DC/DC Converter (1.5V product)

Topr=25℃

CIRCUIT

PARAMETER

SYMBOL

CONDITIONS

VIN=CE=DCOUT=5.0V

MIN.

-

TYP.

200

250

MAX.

280

UNITS

μA

Supply Current 1 *XC9509A/B/C

Supply Current 2 *XC9509A/B/C

IDD_DC1

IDD_DC2

1

VIN=CE=5.0V, DCOUT=0V

330

μA

PFM Supply Current 1 *

XC9509H/K/L

PFM Supply Current 2

* XC9509H/K/L

IDD_PFM1

IDD_PFM2

VIN=CE=DCOUT=5.0V

250

300

310

360

μA

1

VIN=CE=5.0V, DCOUT=0V

Connected to the external components,

Output Voltage

DCOUT(E)

1.470

1.02

1.500

1.20

1.530

1.38

V

3

I

DOUT=30mA

Connected to the external components,

DOUT=10mA

Oscillation Frequency

FOSC

MHz

I

Maximum Duty Ratio

Minimum Duty Ratio

PFM Duty Ratio

MAXDUTY

MINDUTY

DCOUT=0V

100

-

%

4

DCOUT=VIN

0

Connected to the external components,

No load

PFMDUTY

21

30

38

%

3

*XC9509H/K/L

U.V.L.O. Voltage (*2)

LX SW ‘High’ ON Resistance (*3)

VUVLO

RLXH

Connected to the external components

DCOUT=0V, LX=VIN-0.05V

Connected to the external components,

1.00

-

1.40

0.5

1.78

1.0

V

3

5

Ω

LX SW ‘Low’ ON Resistance

RLXL

-

0.5

0.9

Ω

3

V

IN=5.0V

LX SW ‘High’ Leak Current (*12)

LX SW ‘Low’ Leak Current (*12)

Maximum Output Current

Current Limit (*9)

IleakH

IleakL

Imax1

Ilim1

VIN=LX=6.0V, CE=0V

-

0.05

-

1.00

μA

mA

A

11

3

VIN=6.0V, LX=CE=0V

-

1.00

Connected to the external components

600

1.0

-

1.1

6

Connected to the external components,

Efficiency (*4)

EFFI

-

90

+100

5

-

%

3

IDOUT=100mA

Output Voltage

U DCOUT

IDOUT=30mA

ppm/

-

Temperature Characteristics

(U

Topr

・

D

COUT

)

-40℃<Topr<85℃

℃

Connected to the external components,

Soft-Start Time

TSS

Tlat

2

-

10

25

ms

3

CE=0V

Connected to the external components,

resistor

VIN, IDOUT=1mA

Latch Time (*5, 10)

8

10

VIN=CE=5.0V, Short DCOUT by 1Ω

4/41

XC9509

Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9509xxxCAx (Continued)

●Regulator (3.3V product)

Topr=25℃

PARAMETER

Supply Current * XC9509H/K/L

Output Voltage

SYMBOL

CONDITIONS

MIN.

TYP.

40

MAX.

80

UNITS

μA

V

CIRCUIT

IDD_VR

VROUT(E)

Imax2

-

1

2

IROUT=30mA

3.234

3.300

-

3.366

-

Maximum Output Current

Load Regulation

200

mA

mV

U VROUT

Vdif 1

1mA<IROUT<100mA

IROUT=30mA

-

15

50

Dropout Voltage 1 (*6)

Dropout Voltage 2

20

50

Vdif 2

IROUT=100mA

IROUT=30mA

60

110

U VROUT

Line Regulation

-

0.05

0.25

%/V

2

(UVIN・VROUT) 4.3V<VIN<6.0V

Current Limit

Ilim2

VROUT=VROUT(E) x 0.9

240

-

300

30

-

mA

7

Short-Circuit Current

Ishort

VROUT=VSS

VIN=4.3VDC+0.5Vp-pAC,

IROUT=30mA, f=1kHz

IROUT=30mA

Ripple Rejection Rate

Output Voltage

PSRR

-

60

-

dB

12

2

U VROUT

ppm/

±100

Temperature Characteristics (UTopr・VROUT) -40^OC<Topr<85℃

℃

●Detector (2.7V product)

PARAMETER

SYMBOL

CONDITIONS

MIN.

2.646

2

TYP.

2.700

5

MAX.

2.754

8

UNITS

CIRCUIT

Detect Voltage

Hysteresis Range

Output Current

VDF(E)

VHYS

CE=0V

V

8

V

HYS=[VDR(E) ^(*11)- VDF(E)] / VDF(E) x 100

%

IVD

VIN=2.4V, VDOUT=0.5V, CE=0V

-40^OC<Topr<85℃

0.5

1.0

-

mA

9

8

* XC9509A/D/H

Output Current

* XC9509B/C/E/F/K/L

Output Voltage

U VDF

ppm/

±100

Temperature Characteristics

(UTopr・VDF)

℃

Test conditions: Unless otherwise stated:

DC/DC : VIN=3.6V [@ DCOUT:1.5V]

VR: VIN = 4.3V (VIN=VROUT(T) + 1.0V)

VD: VIN=5.0V

Common conditions for all test items: CE=VIN, MODE=0V

●VROUT(T) : Setting Output Voltage

NOTE:

*1 : Including VD supply current (VD operates when in stand-by mode.)

*2 : Including hysteresis operating voltage range.

*3 : ON resistance (Ω)= 0.05 (V) / ILX (A)

*4 : EFFI = { ( output voltage x output current ) / ( input voltage x input current) } x 100

*5 : Time until it short-circuits DCOUT with GND through 1Ωof resistance from a state of operation and is set to DCOUT=0V from

current limit pulse generating.

*6 : Vdif = (VIN1 ^(*7)- VROUT1 ^(*8)

)

*7 : VIN 1 = The input voltage when VROUT1 appears as input voltage is gradually decreased.

*8 : VROUT1 = A voltage equal to 98% of the output voltage whenever an amply stabilized IOUT {VROUT(T) + 1.0V} is input.

*9 : Current limit = When VIN is low, limit current may not be reached because of voltage falls caused by ON resistance or

serial resistance of coils.

*10: Integral latch circuit=latch time may become longer and latch operation may not work when VIN is 3.0V or more.

*11: VDR(E) = VD release voltage

*12: When temperature is high, a current of approximately 5.0μA (maximum) may leak.

*13: When using the IC with a regulator output at almost no load, a capacitor should be placed as close as possible between

AVDD and AGND (CIN2), connected with low impedance. Please also see the recommended pattern layout for your

reference. Should it not be possible to place the input capacitor nearby, the regulated output level may increase up to

the VDD level while the load of the DC/DC converter increases and the regulator output is at almost no load.

5/41

XC9509 Series

■TEST CIRCUITS

Circuit 1 Supply Current, Stand-by Current, CE Current,

MODE Current

Circuit 2 Output Voltage (VR), Load Regulation, Dropout Voltage,

Maximum Output Current, (MODE Voltage)

Circuit 3 Output Voltage (DC/DC), Oscillation Frequency, U.V.L.O.

Voltage, Soft-start Time, CE Voltage, Maximum Output

Current, Efficiency, (PFM Duty Cycle), (MODE Voltage)

Circuit 4 Minimum Duty Cycle, Maximum Duty Cycle

Circuit 6 Current Limit 1 (DC/DC)

Circuit 5 Lx ON Resistance

6/41

XC9509

Series

■TEST CIRCUITS (Continued)

Circuit 7

Current Limit 2 (VR), Short Circuit Current (VR)

Circuit 8

Detect Voltage, Release Voltage (Hysteresis Range)

* For the measurement of the VDD_Sense products,

the input voltage was controlled.

Circuit 9

VD Output Current

Circuit 10 Latch Time

* For the measurement of the VDD_Sense products,

the input voltage was controlled.

Circuit 11 Off-Leak

Circuit 12 Ripple Rejection Rate

7/41

XC9509 Series

■TYPICAL APPLICATION CIRCUIT

FOSC

L

4.7μH

(CDRH4D28C, SUMIDA)

10μH

1.2MHz

600kHz

300kHz

(CDRH5D28, SUMIDA)

22μH

(CDRH6D28, SUMIDA)

MSOP-10 (TOP VIEW)

CIN

CL1

CL2 (*2)

4.7μF (ceramic, TAIYO YUDEN)

VROUT<2.0V

VROUT>2.0V

4.7μF

10μF

Vdif>1.0V

Vdif<1.0V

1.0μF (ceramic, TAIYO YUDEN)

4.7μF (ceramic, TAIYO YUDEN)

(ceramic, TAIYO YUDEN) (ceramic, TAIYO YUDEN)

SD *1 : XB0ASB03A1BR (TOREX)

*1 The DC/DC converter of the XC9508 series automatically switches between synchronous / non-synchronous. The Schottky diode is

not normally needed. However, in cases where high efficiency is required when using the DC/DC converter during in the light load

while in non-synchronous operation, please connect a Schottky diode externally.

*2 Please be noted that the recommend value above of the CL2 may be changed depending on the input voltage value and setting voltage

value.

■OPERATIONAL EXPLANATION

The XC9509 series consists of a synchronous step-down DC/DC converter, a high speed LDO voltage regulator, and a

voltage detector.

●DC/DC Converter

The series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase

compensation circuit, output voltage adjustment resistors, driver transistor, synchronous switch, current limiter circuit,

U.V.L.O. circuit and others. The series ICs compare, using the error amplifier, the voltage of the internal voltage

reference source with the feedback voltage from the VOUT pin through split resistors. Phase compensation is

performed on the resulting error amplifier output, to input a signal to the PWM comparator to determine the turn-on time

during PWM operation. The PWM comparator compares, in terms of voltage level, the signal from the error amplifier

with the ramp wave from the ramp wave circuit, and delivers the resulting output to the buffer driver circuit to cause the

Lx pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage. The

current feedback circuit monitors the P-channel MOS driver transistor current for each switching operation, and

modulates the error amplifier output signal to provide multiple feedback signals. This enables a stable feedback loop

even when a low ESR capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage.

The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.

The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from

300kHz, 600 kHz and 1.2 MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for

PWM operation, and to synchronize all the internal circuits.

The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the

feedback voltage divided by the internal split resistors. When a voltage lower than the reference voltage is fed back,

the output voltage of the error amplifier increases. The gain and frequency characteristics of the error amplifier output

are fixed internally to deliver an optimized signal to the mixer.

8/41

XC9509

Series

■OPERATIONAL EXPLANATION (Continued)

●DC/DC Converter (Continued)

The PWM control of the XC9509A to F series are controlled on a specified frequency from light loads through the heavy

loads. Since the frequency is specified, the composition of a noise filter etc. becomes easy. However, the efficiency at

the time of the light load may become low. The XC9509H to L series can switch in any timing between PWM control

and PWM/PFM automatic switching control. The series cannot control only PFM mode. If needed, the operation can

be set on a specified frequency; therefore, the control of the noise etc. is possible and the high efficiency at the time of

the light load during PFM control mode is possible. With the automatic PWM/PFM switching control function, the series

ICs are automatically switched from PWM control to PFM control mode under light load conditions. If during light load

conditions the coil current becomes discontinuous and on-time rate falls lower than 30%, the PFM circuit operates to

output a pulse with 30% of a fixed on-time rate from the Lx pin. During PFM operation with this fixed on-time rate,

pulses are generated at different frequencies according to conditions of the moment. This causes a reduction in the

number of switching operations per unit of time, resulting in efficiency improvement under light load conditions.

However, since pulse output frequency is not constant, consideration should be given if a noise filter or the like is

needed. Necessary conditions for switching to PFM operation depend on input voltage, load current, coil value and

other factors.

The XC9509 series automatically switches between synchronous / non-synchronous according to the state of the DC/DC

converter. Highly efficient operations are achievable using the synchronous mode while the coil current is in a

continuous state. The series enters non-synchronous operation when the built-in N-ch switching transistor for

synchronous operation is shutdown, which happens when the load current becomes low and the operation changes to a

discontinuous state. The IC can operate without an external schottky diode because the parasitic diode in the N-ch

switching transistor provides the circuit's step-down operation. However, since Vf of the parasitic diode is a high 0.6V,

the efficiency level during non-synchronous operation shows a slight decrease. Please use an external schottky diode

if high efficiency is required during light load current.

●Continuous Mode: Synchronous

●Discontinuous Mode: Non-Synchronous

9/41

XC9509 Series

■OPERATIONAL EXPLANATION (Continued)

●DC/DC Converter (Continued)

The current limiter circuit of the XC9509 series monitors the current flowing through the P-channel MOS driver transistor

connected to the Lx pin, and features a combination of the constant-current type current limit mode and the operation

suspension mode..

① When the driver current is greater than a specific level, the constant-current type current limit function operates to

turn off the pulses from the Lx pin at any given timing.

② When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.

③ At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of

an over current state.

④ When the over current state is eliminated, the IC resumes its normal operation.

The IC waits for the over current state to end by repeating the steps ① through ③. If an over current state continues

for 8msec* and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state

of the driver transistor, and goes into operation suspension mode. Once the IC is in suspension mode, operations can

be resumed by either turning the IC off via the CE pin, or by restoring power to the VIN pin. The suspension mode does

not mean a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains

in operation. The constant-current type current limit of the XC9509 series can be set at 1.1A for MSOP-10 package

and 0.7A for USP-10 package.

*

<U.V.L.O. Circuit>

When the VIN pin voltage becomes 1.4 V or lower, the P-channel 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 1.8 V or higher,

switching operation takes place. By releasing the U.V.L.O. function, the IC performs the soft start function to initiate

output startup operation. The soft start function operates even when the VIN pin voltage falls momentarily below the

U.V.L.O. operating voltage. The U.V.L.O. circuit does not cause a complete shutdown of the IC, but causes pulse

output to be suspended; therefore, the internal circuitry remains in operation.

●High Speed LDO Voltage Regulator

The voltage regulator block of the XC9509 series consists of a reference voltage source, error amplifier, and current

limiter circuit. The voltage divided by split resistors is compared with the internal reference voltage by the error

amplifier. The P-channel MOSFET, which is connected to the VROUT pin, is then driven by the subsequent output

signal. The output voltage at the VROUT pin is controlled and stabilized by a system of negative feedback. A stable

output voltage is achievable even if used with low ESR capacitors as a phase compensation circuit is built-in.

The reference voltage source provides the reference voltage to ensure stable output voltage of the regulator.

The error amplifier compares the reference voltage with the signal from VROUT, and the amplifier controls the output of

the Pch driver transistor.

The voltage regulator block includes a combination of a constant current limiter circuit and a foldback circuit. The

voltage regulator senses output current of the built-in P channel output driver transistor inside. When the load current

reaches the current limit level, the current limiter circuit operates and the output voltage of the voltage regulator block

drops. As a result of this drop in output voltage, the foldback circuit operates, output voltage drops further and the load

current decreases. When the VROUT and GND pin are shorted, the load current of about 30mA flows.

10/41

XC9509

Series

■OPERATIONAL EXPLANATION (Continued)

●Voltage Detector

The detector block of the XC9509 series detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or

VROUT internally.

(N-channel Open Drain Type)

The operation of the XC9509 series' DC/DC converter block and voltage regulator block will enter into the shut down

mode when a low level signal is input to the CE pin. During the shut down mode, the current consumption occurs only

in the detector and is 3.0μA (TYP.), with a state of high impedance at the Lx pin and the DCOUT pin. The IC starts its

operation by inputting a high level signal to the CE pin. The input to the CE pin is a CMOS input and the sink current is

0μA (TYP.).

The operation of the XC9509A to C series' voltage detector block will enter into stand-by mode when a high level signal is

input to the MODE pin. When a low level signal is input, the voltage regulator block will enter into stand-by mode.

However, if the IC enters into stand-by mode via the CE pin, the voltage regulator block also shuts down. Likewise, if

the XC9509D to F series enters into stand-by mode via the CE pin, the DC/DC converter block can also shut down.

With the XC9509H to L series control can be PWM control when the MODE pin is 'H' level and PWM/PFM automatic

switching control when the MODE pin is 'L' level.

■NOTES ON USE

●Application Information

1. The XC9509 series is designed for use with a ceramic output capacitor. If, however, the potential difference

between dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the resulting high

switching energy and oscillation could occur on the output. If the input-output potential difference is large, connect

an electrolytic capacitor in parallel to compensate for insufficient capacitance.

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. When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there

is the possibility that some cycles may be skipped completely.

4. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted

and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all.

●DC/DC Waveform (3.3V, 1.2MHz)

<E<xEtextrenranlaCl oCmompopnoennetns>ts>

L

:4.7μH(CDRH4D28C,SUMIDA)

L L :4:.47.μ7μH(HC(DCRDHR4HD42D82C8,CS,USMUMIDIAD)A)

CICNIN :4:.47.μ7μF(Fc(ecrearmamic)ic)

CIN :4.7μF(ceramic)

CL

:10μF(ceramic)

CLCL :1:01μ0μF(Fc(ecrearmamic)ic)

11/41

XC9509 Series

■NOTES ON USE (Continued)

●DC/DC Waveform (3.3V, 1.2MHz)(Continued)

5. The IC's DC/DC converter operates in synchronous mode when the coil current is in a continuous state and

non-synchronous mode when the coil current is in a discontinuous state. In order to maintain the load current

value when synchronous switches to non-synchronous and vise versa, a ripple voltage may increase because of

the repetition of switching between synchronous and non-synchronous. When this state continues, the increase in

the ripple voltage stops. To reduce the ripple voltage, please increase the load capacitance value or use a schottky

diode externally. When the current used becomes close to the value of the load current when synchronous

switches to non- synchronous and vise versa, the switching current value can be changed by changing the coil

inductance value. In case changes to coil inductance are to values other than the recommended coil inductance

values, verification with actual components should be done.

Ics = (VIN - DCOUT) x OnDuty / (L x Fosc)

Ics: Switching current from synchronous rectification to non-synchronous rectification

OnDuty: OnDuty ratio of P-ch driver transistor (^.=.step down ratio : DCOUT / VIN)

L: Coil inductance value

Fosc: Oscillation frequency

IDOUT: The DC/DC load current

6. When the XC9509H to L series operate in PWM/PFM automatic switching control mode, the reverse current may

become quite high around the load current value when synchronous switches to non-synchronous and vise versa

(also refer to no. 5 above). Under this condition, switching synchronous rectification and non-synchronous

rectification may be repeated because of the reverse current, and the ripple voltage may be increased to 100mV or

more. The reverse current is the current that flows in the PGND direction through the N-ch driver transistor from

the coil. The conditions, which cause this operation are as follows.

PFM Duty < Step down ratio = DCOUT / VIN x 100 (%)

PFM Duty: 30% (TYP.)

Please switch to PWM control via the MODE function in cases where the load current value of the DC/DC converter

is close to synchronous.

●DC/DC Waveform (1.8V, 600kHz) @ VIN=6.0V

L

10μH(CDRH5D28C,SUMIDA)

CIN :4.7μF(ceramic)

CL :10μF(ceramic)

Step Down ratio: 1.8V / 6.0V = 30%<PFM Duty 31%>

12/41

XC9509

Series

■NOTES ON USE (Continued)

●DC/DC Waveform (3.3V, 1.2MHz) (Continued)

7. With the DC/DC converter of the IC, the peak current of the coil is controlled by the current limit circuit. Since the

peak current increases when dropout voltage or load current is high, current limit starts operating, and this can lead

to instability. When peak current becomes high, please adjust the coil inductance value and fully check the circuit

operation. In addition, please calculate the peak current according to the following formula:

Peak current: Ipk = (VIN - DCOUT) x OnDuty / (2 x L x Fosc) + IDOUT

8. When the peak current, which exceeds limit current flows within the specified time, the built-in driver transistor is

turned off (the integral latch circuit). During the time until it detects limit current and before the built-in transistor can

be turned off, the current for limit current flows; therefore, care must be taken when selecting the rating for the coil or

the Schottky diode.

9. When VIN is low, limit current may not be reached because of voltage falls caused by ON resistance or serial

resistance of the coil.

10. In the integral latch circuit, latch time may become longer and latch operation may not work when VIN is 3.0V or

more.

11. Use of the IC at voltages below the recommended voltage range may lead to instability.

12. This IC and the external components should be used within the stated absolute maximum ratings in order to prevent

damage to the device.

13. When using IC with a regulator output at almost no load, a capacitor should be placed as close as possible between

AVDD and AGND (CIN2), connected with low impedance. Please also see the recommended pattern layout on page

14 for your reference. Should it not be possible to place the input capacitor nearby, the regulated output level may

increase up to the VDD level while the load of the DC/DC converter increases and the regulator output is at almost

no load.

14. Should the bi-directional load current of the synchronous DC/DC converter and the regulator become large, please

be careful of the power dissipation when in use. Please calculate power dissipation by using the following formula.

Pd=PdDC/DC + PdVR

DC/DC power dissipation (when in synchronous operation) : PdDC/DC = IDOUT²x RON

VR power dissipation: PdVR=(DCOUT – VROUT) x IROUT

RON: ON resistance of the built-in driver transistor to the DC/DC (= 0.5

Ω <TYP.>)

RON=Rpon x P-chOnDuty / 100

+ Rnon x (1 – P-chOnDuty / 100)

15. The voltage detector circuit built-in the XC9509 series internally monitor the VDD pin voltage, the DC/DC output pin

voltage and VR output pin voltage. For the XC9509B/C/E/F/K/L series, which voltage detector circuit monitors the

DC/DC output pin voltage and the VR output pin voltage, please determine the detect voltage value (VDF) by the

following equation.

VDF ≦ (Setting voltage on both the DCOUT voltage and the VROUT voltage)×85%*

* An assumed value of tolerance among the DCOUT voltage, the VROUT voltage, and the VD release voltage

(The VD detect voltage and hysteresis range).

13/41

XC9509 Series

■NOTES ON USE (Continued)

●Instructions on Pattern Layout

1. In order to stabilize VIN's voltage level, we recommend that a by-pass capacitor (CIN) be connected as close as

possible to the AVDD & AGND pins. Should it not be possible to place the input capacitors nearby, the regulated

output level may increase because of the switching noise of the DC/DC converter.

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 DC/DC converter and have adverse influence on the

regulator output.

5. If using a Schottky diode, please connect the anode side to the AGND pin through CIN. Characteristic degradation

caused by the noise may occur depending on the arrangement of the Schottky diode.

6. Please use the AVDD and PVDD pins with the same electric potential.

<MSOP-10 Reference pattern layout>

14/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS

(A) DC/DC CONVERTER

(1) Efficiency vs. Output Current

15/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(2) Output Voltage VS. Output Current

16/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(3) Output Voltage vs. Ripple Voltage

17/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(4) Output Voltage vs. Ambient Temperature

DC/DC:2.5V,1.2MHz

DC/DC:0.9V,1.2MHz

VIN=2.4V,MODE=0V

CIN=4.7uF,CL=10.0uF,L=4.7uH(CDRH4D28C)

VIN=3.6V,MODE=0V

CIN=4.7uF,CL=10.0uF,L=4.7uH(CDRH4D28C)

2.7

2.6

2.5

2.4

2.3

1.1

1.0

0.9

0.8

0.7

IDOUT=0.1mA

10mA

100mA

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temperature : Ta (

)

℃

Ambient Temperature : Ta (

)

℃

DC/DC:4.0V,1.2MHz

VIN=5.0V,MODE=0V

CIN=4.7uF,CL=10.0uF,L=4.7uH(CDRH4D28C)

4.2

IDOUT=0.1mA

10mA

100mA

4.1

4.0

3.9

3.8

-50

-25

0

25

50

75

100

Ambient Temperature : Ta (

)

℃

(5) Soft Start Time vs. Ambient Temperature

DC/DC:1.2MHz

DC/DC:600kHz

VIN=6.0V,CE=0V to 6.0V,MODE=0V,IDOUT=0.1mA

CIN=4.7uF,CL=10.0uF,L=10.0uH(CDRH5D28)

VIN=6.0V,CE=0V to 6.0V,MODE=0V,IDOUT=0.1mA

CIN=4.7uF,CL=10.0uF,L=4.7uH(CDRH4D28C)

15

12

9

15

12

9

DCOUT=0.9V

DCOUT=2.5V

DCOUT=4.0V

6

DCOUT=0.9V

3

DCOUT=4.0V

0

-50

-25

0

25

50

75

)

100

-50

-25

0

25

50

75

)

100

Ambient Temperature : Ta (

℃

18/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(6) DC/DC Supply Current vs. Ambient Temperature (VR: Shutdown)*

DC/DC:1.2MHz

DC/DC:600kHz

CE=VIN,DCOUT=VIN,MODE=0V(VR:SHUTDOWN)

500

400

300

200

100

0

500

400

300

200

100

0

DCOUT=0.9V

2.5V

DCOUT=0.9V

2.5V

4.0V

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temperature : Ta (

)

℃

Ambient Temperature : Ta (

)

℃

DC/DC:300kHz

CE=VIN,DCOUT=VIN,MODE=0V(VR:SHUTDOWN)

500

DCOUT=0.9V

2.5V

4.0V

400

300

200

100

0

-50

-25

0

25

50

75

100

Ambient Temperature : Ta (

)

℃

*XC9509A/B/C series only

19/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(7) LX Pch/Nch ON Resistance vs. Input Voltage

DC/DC:LX Pch

DC/DC:LX Nch

CE=VIN,LX=VIN-0.05V, DCOUT=0V

LX=0.05V, DCOUT=VIN

1.0

0.8

0.6

0.4

0.2

0.0

1.0

0.8

0.6

0.4

0.2

0.0

Ta= 85

℃

Ta= 25

℃

Ta= 85

℃

Ta= 25

℃

Ta= -40

℃

Ta= -40

℃

2.0

3.0

4.0

5.0

6.0

2.0

3.0

4.0

5.0

6.0

Input Voltage : VIN (V)

(9) U.V.L.O. Voltage vs. Ambient Temperature

(8) Oscillation Frequency vs. Ambient Temperature

DC/DC:2.5V,1.2MHz

MODE=0V

CIN=4.7uF,CL=10.0uF,L=4.7uH(CDRH4D28C)

CIN=4.7uF,CL=10.0uF,MODE=0V,IDOUT=10mA

2.2

1.6

VIN=3.6V

4.2V

5.0V

1.8

1.4

6.0V

UVLO2(release)

1.4

1.2

1.0

0.8

UVLO1(detect)

1.0

0.6

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temperature : Ta (

)

℃

Ambient Temperature : Ta (

)

℃

20/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(10-1) DC/DC Load Transient Response (DCOUT: 1.8V, FOSC: 1.2MHz)

(a) PWM Control

(b) PWM/PFM Automatic Switching Control* (*XC9509H/K/L Series Only)

21/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(10-2) DC/DC Load Transient Response (*DCOUT: 3.3V, FOSC: 1.2MHz)

(a) PWM Control

(b) PMM/PFM Automatic Switching Control* (*XC9509H/K/L Series Only)

22/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(10-3) DC/DC Load Transient Response (*DCOUT: 1.8V, FOSC: 600kHz)

(a) PWM Control

(b) PMM/PFM Automatic Switching Control* (*XC9509H/K/L Series Only)

23/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(10-4) DC/DC Load Transient Response (DCOUT: 3.3V, FOSC: 600kHz)

(a) PWM Control

(b) PMM/PFM Automatic Switching Control* (*XC9509H/K/L Series Only)

24/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(10-5) DC/DC Load Transient Response (DCOUT: 1.8V, FOSC: 600kHz)

(a) PWM Control

(b) PMM/PFM Automatic Switching Control* (*XC9509H/K/L Series Only)

25/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(A) DC/DC CONVERTER (Continued)

(10-6) DC/DC Load Transient Response (DCOUT: 3.3V, FOSC: 600kHz)

(a) PWM Control

(b) PMM/PFM Automatic Switching Control* (*XC9509H/K/L Series Only)

26/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(B) VOLTAGE REGULATOR

(1) Output Voltage vs. Input Voltage

VR:0.9V

Ta=25 ,CIN=4.7uF,CL=4.7uF

℃

1.3

1.1

0.9

0.7

0.5

0.3

1.00

0.95

0.90

0.85

0.80

0.75

IROUT=0mA

1mA

IROUT=0mA

1mA

30mA

100mA

1.2

1.4

1.6

1.8

2.0

2.2

2.0

3.0

4.0

5.0

6.0

Input Voltage : VIN (V)

VR:2.5V

Ta=25 ,CIN=4.7uF,CL=4.7uF

℃

Ta=25 ,CIN=4.7uF,CL=4.7uF

℃

2.60

2.55

2.50

2.45

2.40

2.35

2.9

2.7

2.5

2.3

2.1

1.9

IROUT=0mA

1mA

IROUT=0mA

1mA

30mA

100mA

3.0

4.0

5.0

6.0

2.0

2.2

2.4

2.6

2.8

3.0

Input Voltage : VIN (V)

VR:4.0V

Ta=25 ,CIN=4.7uF,CL=4.7uF

℃

Ta=25 ,CIN=4.7uF,CL=4.7uF

℃

4.10

4.05

4.00

3.95

3.90

3.85

4.4

4.2

4.0

3.8

3.6

3.4

IROUT=0mA

1mA

IROUT=0mA

1mA

30mA

100mA

5.0

5.2

5.4

5.6

5.8

6.0

3.5

3.7

3.9

4.1

4.3

4.5

Input Voltage : VIN (V)

27/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(B) VOLTAGE REGULATOR (Continued)

(2) Output Voltage vs. Output Current (Current Limit)

Output Current : IROUT (mA)

28/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(B) VOLTAGE REGULATOR (Continued)

(3) Dropout Voltage vs. Output Current

VR:2.5V

VR:0.9V

CIN=4.7uF,CL=4.7uF

0.5

0.4

0.3

0.2

0.1

0.0

1.0

0.8

0.6

0.4

0.2

0.0

Ta= 85

25

℃

Ta= 25

℃

Ta= -40

℃

Ta= 85

Ta= -40

℃

0

50

100

150

200

0

50

100

150

200

Output Current : IROUT (mA)

VR:4.0V

CIN=4.7uF,CL=4.7uF

0.5

0.4

0.3

0.2

0.1

0.0

Ta= -40

℃

Ta= 25

℃

Ta= 85

℃

0

50

100

150

200

Output Current : IROUT (mA)

29/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(B) VOLTAGE REGULATOR (Continued)

(4) Output Voltage vs. Output Current

VR:0.9V

VR:2.5V

VIN=2.4V,CIN=4.7uF,CL=4.7uF

ꢀ

VIN=3.5V,CIN=4.7uF,CL=4.7uF

2.7

2.6

2.5

2.4

2.3

2.2

1.1

1.0

0.9

0.8

0.7

0.6

Ta= -40

25

℃

Ta= 25

℃

Ta= -40

℃

Ta= 85

℃

Ta= 85

℃

0

50

100

150

200

0

50

100

150

200

Output Current : IROUT (mA)

VR:4.0V

VIN=5.0V,CIN=4.7uF,CL=4.7uF

Ta= 25

4.2

℃

Ta= -40

℃

4.1

4.0

3.9

3.8

3.7

Ta= 85

℃

0

50

100

150

200

Output Current : IROUT (mA)

30/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(B) VOLTAGE REGULATOR (Continued)

(5) VR Supply Current vs. Ambient Temperature (DC/DC Shutdown)*

Ambient Temperature : Ta (℃)

31/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(B) VOLTAGE REGULATOR (Continued)

(6) Output Voltage vs. Ambient Temperature

32/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(B) VOLTAGE REGULATOR (Continued)

(7) Ripple Rejection Ratio vs. Ripple Frequency

33/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(B) VOLTAGE REGULATOR (Continued)

(8) VR Load Transient Response

34/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(C) VOLTAGE DETECTOR

(1) Output Current vs. Input Voltage

(2) Detect Voltage vs. Input Voltage

35/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(C) VOLTAGE DETECTOR (Continued)

(3)DETECT VOLTAGE , RELEASE VOLTAGE vs. AMBIENT TEMPERATURE

(3) Detect Voltage, Release Voltage vs. Ambient Temperature

VD:0.9V

VD:2.5V

3.1

2.9

2.7

2.5

2.3

2.1

1.5

1.3

1.1

0.9

0.7

0.5

VDR

VDF

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temp. : Ta (deg.)

Ambient Temperature : Ta (℃)

Ambient Temp. : Ta (deg.)

Ambient Temperature : Ta (℃)

VD:5.0V

5.6

5.4

5.2

5.0

4.8

4.6

VDR

VDF

-50

-25

0

25

50

75

100

Ambient Temp. : Ta (deg.)

Ambient Temperature : Ta (℃)

36/41

XC9509

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(D) COMMON

(1) Supply Current vs. Ambient Temperature (DC/DC & VR & VD)

Ambient Temperature : Ta (℃)

(2) Shutdown Current vs. Input Voltage

(3) Shutdown Current vs. Ambient Temperature

37/41

XC9509 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(D) COMMON (Continued)

(4) CE Pin Threshold Voltage vs. Ambient Temperature

(5) MODE Pin Threshold Voltage vs. Ambient Temperature

38/41

XC9509

Series

■PACKAGING INFORMATION

●MSOP-10

●USP-10

* Soldering fillet surface is not

formed because the sides of

the pins are not plated

●USP-10 Recommended Pattern Layout

●USP-10 Recommended Metal Mask Design

2.3

39/41

XC9509 Series

■MARKING RULE

①Represents product series

●MSOP-10, USP-10

MARK

8

PRODUCT SERIES

XC9509xxxxxx

②Represents DC/DC control methods and MODE pin

MODE PIN

(H level)

MODE PIN

(L level)

MARK DC/DC CONTROL

PRODUCT SERIES

A

B

XC9509Axxxxx

XC9509Bxxxxx

XC9509Cxxxxx

XC9509Dxxxxx

XC9509Exxxxx

XC9509Fxxxxx

XC9509Hxxxxx

XC9509Kxxxxx

XC9509Lxxxxx

VR: OFF

VR:ON

USP-10

C

(TOP VIEW)

PWM Control

D

DC/DC: OFF

DC/DC: ON

E

F

H

PWM, PFM/PWM

PFM/PWM

PWM Control

K

Manual Switch

L

Auto Switching

③④Represents detect voltage DC/DC,VR and VD (ex.)

MARK

DC/DC

1.8V

VR

VD

PRODUCT SERIES

XC9509x03xxx

③

④

0

3

3.3V

3.0V

⑤Represents oscillation frequency

MSOP-10

(TOP VIEW)

MARK

OSCILLATION FREQUENCY

PRODUCT SERIES

XC9509xxx3xx

XC9509xxx6xx

XC9509xxxCxx

3

6

300kHz

600kHz

1.2MHz

C

⑥Represents production lot number

0 to 9,A to Z reverse character 0 to 9, A to Z repeated (G, I, J, O, Q, W excepted)

Note: No character inversion used.

40/41

XC9509

Series

1. The products 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. We assume no responsibility for any infringement of patents, patent rights, or other

rights arising from the use of any information and circuitry in this datasheet.

3. Please ensure suitable shipping controls (including fail-safe designs and aging

protection) are in force for equipment employing products listed in this datasheet.

4. The products in this datasheet are not developed, designed, or approved for use with

such equipment whose failure of malfunction can be reasonably expected to directly

endanger the life of, or cause significant injury to, the user.

(e.g. Atomic energy; aerospace; transport; combustion and associated safety

equipment thereof.)

5. Please use the products listed in this datasheet within the specified ranges.

Should you wish to use the products under conditions exceeding the specifications,

please consult us or our representatives.

6. We assume no responsibility for damage or loss due to abnormal use.

prior permission of TOREX SEMICONDUCTOR LTD.

41/41


型号：	XC9509L256AL
厂家：	Torex Semiconductor
描述：	Switching Regulator/Controller
文件：	总41页 (文件大小：2005K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

XC9509L256AL [TOREX]

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