XC9224B082AR [TOREX]

1A Driver Transistor Built-In Step-Down DC/DC Converters; 1A驱动三极管内置降压型DC / DC转换器


型号：	XC9224B082AR
厂家：	Torex Semiconductor
描述：	1A Driver Transistor Built-In Step-Down DC/DC Converters 1A驱动三极管内置降压型DC / DC转换器转换器驱动
文件：	总7页 (文件大小：208K)
中文：	中文翻译
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XC9223/9224 Series

1A Driver Transistor Built-In Step-Down DC/DC Converters

Preliminary

October 7, 2004 V2

Green Operation Compatible

ꢀAPPLICATIONS

HDD

ꢀ

Step-Down DC/DC Converters

ꢁ

Notebook computers

CD-R / RW, DVD

ꢁ

Built-in P-channel MOSFET

Built-in Synchronous N-channel MOSFET

(No Schottky Barrier Diode Required)

: 0.23Ω

: 0.25Ω

PDAs, Portable communication modems

Digital cameras, Video recorders

ꢀ

High Efficiency

Oscillation Frequency:

: 94% (VIN=5.0V, VOUT=3.3V)

: 1.0MHz, 2.0MHz

Various general-purpose power supplies

ꢁ

(Small Inductor for High Frequency Selectable)

ꢀ

Synchronized with an External Clock Signal

Ceramic Capacitor Compatible

MSOP-10 / USP-10 Packages

ꢀGENERAL DESCRIPTION

ꢀFEATURES

The XC9223/9224 series are synchronous step-down DC/DC converters

with a 0.23Ω (TYP.) P-channel driver transistor and a synchronous

0.25Ω (TYP.) N-channel switching transistor built-in. A highly efficient

and stable current can be supplied up to 1.0A by reducing ON resistance

of the built-in transistor.

Input Voltage Range

Output Voltage Range

: 2.2V ~ 6.0V

: 0.8V ~ VIN

Can be set freely with 0.8V (+2%) of

reference voltage by the external resistors.

: 1MHz, 2MHz ( ± 15% accuracy)

: 1.0A

: 0.5A (MIN.) when LIM pin=’L’

: 1.5A (MIN.) when LIM pin=’H’

: PWM/PFM externally switching

: Synchronized with an external clock signal

With a high switching frequency of 1.0MHz or 2.0MHz, a small inductor is

selectable; therefore, the XC9223/9224 series are ideally suited to

applications with height limitation such as HDD or space-saving

applications.

Oscillation Frequency

Output Current

Maximum Current Limit

Current limit value can be chosen either 1.5A (MIN.) when the LIM pin is

high level, or 0.5A (MIN.) when the LIM pin is low level for using the power

supply which current limit value differs such as USB or AC adapter. With

the MODE/SYNC pin, the XC9223/9224 series provide mode selection of

the fixed PWM control or automatically switching current limit PFM/PWM

control. As for preventing unwanted switching noise, the XC9223/9224

series can be synchronized with an external clock signal within the range

of ± 25% toward an internal clock signal via the MODE/SYNC pin. For

protection against heat damage of the ICs, the XC9223/9224 series build

in three protection functions: integral latch protection, thermal shutdown,

and short-circuit protection.

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

1.8V or lower.

The series’ detector function monitors the discretional voltage by external

resistors.

Controls

Protection Circuits

: Thermal shutdown

: Integral latch method (over current limit)

: Short-circuit protection

: 3mS (TYP.) internally set

Soft-Start Time

Voltage Detector

: 0.712V detect, N-ch open drain output

ꢀTYPICAL APPLICATION CIRCUIT

ꢀTYPICAL PERFOMANCE CHARACTERICSTICS

ꢁ

Efficiency vs. Output Current

VIN=5.0V, FOSC=2.0MHz

L=2.0µH(CDRH4D28C), CIN=10µF(ceramic), CL=10µF(ceramic)

CIN

100

VIN

PGND

VIN

VOUT

VDIN

AGND

CFB

MODE/SYNC

LIM

VDOUT

MODE/

VDOUT

(ceramic)

VOUT=3.3V

VOUT=1.5V

RFB1

SYNC

LIM

RFB2

Output Current: IOUT (mA)

100

1000

10000

Data Sheet

DC000019

XC9223/9224 Series

1A Driver Transistor Built-In Step-Down DC/DC Converters

Preliminary

ꢀPIN CONFIGURATION

1 VIN

PGND 10

VIN 1

VDIN 2

AGND 3

VDOUT 4

FB 5

10 PGND

9 LX

2 VDIN

3 AGND

4 VDOUT

5 FB

LX 9

CE 8

8 CE

7 MODE/SYNC

MODE/SYNC 7

6 LIM

LIM 6

MSOP-10

USP-10

(TOP VIEW)

(BOTTOM VIEW)

* Please short the AGND pin and the PGND pin

(pin no. 3 and 10) before use.

* For mounting intensity and heat dissipation, please

refer to recommended mounting pattern and

recommended metal mask when soldering the pad

of USP-10.

ꢀPIN ASSIGNMENT

PIN NUMBER

PIN NAME

VIN

FUNCTIONS

Input

VDIN

Voltage Detector Input

AGND

VDOUT

Analog Ground

VD Output

Output Voltage Monitor

Over Current Limit Setting

Mode Switch / External Clock Input

Chip Enable

LIM

MODE/SYNC

Switch

PGND

Power Ground

ꢀPRODUCT CLASSIFICATION

ꢁOrdering Information

XC9223B 12345

XC9224B 12345

DESIGNATOR

DESCRIPTION

SYMBOL

DESCRIPTION

1 2

Reference Voltage

: Fixed voltage

: 1.0 MHz

DC/DC Oscillation Frequency

Package

: 2.0 MHz

: MSOP-10

: USP-10

: Embossed tape, Standard feed

: Embossed tape, Reverse feed

Device Orientation

Data Sheet

DC000019

XC9223/9224 Series

1A Driver Transistor Built-In Step-Down DC/DC Converters

Preliminary

ꢀPACKAGING INFORMATION

ꢁMSOP-10

ꢁUSP-10

0.15+0.01

2.7+0.05

0.30

0.15

3.00+0.10

2.30

Soldering fillet surface is not formed

because the sides of the pins are not plated.

(0.5)

0.2+0.05

(0.2)

(0.5)

ꢀBLOCK DIAGRAM

VIN

LIM

Current Limit

PFM

Error Amp.

Comparator

PWM

Buffer

Driver

Logic

Current

Feedback

Vref with

Soft-Start,

PGND

AGND

Ramp Wave

Generator,

OCS

Thermal

Shutdown

MODE/

SYNC

PMW/PFM

VDOUT

VDIN

Data Sheet

DC000019

XC9223/9224 Series

1A Driver Transistor Built-In Step-Down DC/DC Converters

Preliminary

ꢀABSOLUTE MAXIMUM RATINGS

Ta=25 C

PARAMETER

VIN Pin Voltage

VDIN Pin Voltage

VDOUT Pin Voltage

VDOUT Pin Current

FB Pin Voltage

SYMBOL

VIN

VDIN

VDOUT

IDOUT

VFB

VLIM

VMODE/SYNC

VCE

RATINGS

- 0.3 ~ 6.5

- 0.3 ~ VDD + 0.3

2000

UNITS

LIM Pin Voltage

MODE/SYNC Pin Voltage

CE Pin Voltage

LX Pin Voltage

LX Pin Current

VLX

ILX

MSOP-10

USP-10

Operating Temperature Range

Storage Temperature Range

350*

Power Dissipation

150

Topr

Tstg

- 40 ~ + 85

- 55 ~ + 125

* When implemented on a PCB.

Data Sheet

DC000019

XC9223/9224 Series

1A Driver Transistor Built-In Step-Down DC/DC Converters

Preliminary

ꢀELECTRICIAL CHARACTERISTICS

XC9223B081xx

Topr=25 C

PARAMETER

Input Voltage

FB Voltage

Output Voltage Range

Maximum Output Current (*1)

SYMBOL

VIN

VFB

VOUTSET

IOUTMAX

CONDITIONS

MIN.

2.2

0.784

0.8

TYP.

0.800

MAX.

6.0

0.816

VIN

UNIT CIRCUIT

1.0

FB=VFB x 0.9, Voltage which Lx pin voltage

holding “L” level

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

VUVLO

1.8

Supply Current 1

Supply Current 2

Stand-by Current

IDD1

IDD2

ISTB

FB=VFB x 0.9

FB=VFB x 1.1 (Oscillation stops)

CE=0V

380

µA

1.0

Connected to external components,

IOUT=10mA

Oscillation Frequency

FOSC

0.85

1.00

1.15

MHz

Connected external components,

IOUT=10mA, apply an external clock signal to

the MODE/SYNC

External Clock Signal

Synchronized Frequency

SYNCOSC

0.75

1.25

MHz

External Clock Signal Duty

Maximum Duty Ratio

Minimum Duty Ratio

SYNCDTY

MAXDTY

MINDTY

100

FB=VFB x 0.9

FB=VFB x 1.1

Connected to external components,

MODE/SYNC=0V, IOUT=0.1mA

Connected to external components,

CE=VIN=5.0V, VOUT=3.3V, IOUT=200mA

FB=VFB x 0.9, ILx=100mA

PFM Switch Current

Efficiency (*3)

IPFM

EFFI

150

Lx SW “H” On Resistance (*4)

Lx SW “L” On Resistance (*4)

RLxH

RLxL

0.23

0.25

Ω

LIM=0V, FB=VFB x 0.9

Current which Lx starts oscillation

LIM=VIN, FB=VFB x 0.9

Current which Lx starts oscillation

FB=VFB x 0.9, Short Lx by 1Ω resistance

FB Voltage which Lx becomes “L”

Connected to external components,

CE=0VDVIN, IOUT=1mA

Current Limit 1

Current Limit 2

ILIM1

ILIM2

0.5

1.5

Integral Latch Time (*5, *6)

Short Detect Voltage

TLAT

VSHORT

TSS

0.4

Soft-Start Time

Thermal Shutdown Temperature

Hysteresis Temperature

TTSD

THYS

150

FB=VFB x 0.9, Voltage which Lx becomes “H”

when voltage applied to CE

FB=VFB x 0.9, Voltage which Lx becomes “L”

when voltage applied to CE

CE “H” Voltage

CE “L” Voltage

VCEH

VCEL

1.2

0.4

MODE/SYNC “H” Voltage

MODE/SYNC “L” Voltage

LIM “H” Voltage

VMODE/SYNCH

VMODE/SYNCL

VLIMH

1.2

0.4

0.1

1.2

LIM “L” Voltage

CE “H” Current

CE “L” Current

VLIML

ICEH

ICEL

VIN=CE=6.0V

VIN=6.0V, CE=0V

µA

-0.1

MODE/SYNC “H” Current

MODE/SYNC “L” Current

LIM “H” Current

LIM “L” Current

FB “H” Current

FB “L” Current

Lx SW “H” Leak Current

Lx SW “L” Leak Current (*7)

IMODE/SYNCH

IMODE/SYNCL

ILIMH

VIN=CE=MODE/SYNC=6.0V

VIN=CE=6.0V, MODE/SYNC=0V

VIN=CE=LIM=6.0V

VIN=CE=6.0V, LIM=0V

VIN=CE=FB=6.0V

VIN=CE=6.0V, FB=0V

VIN=LX=6.0V, VCE=0V

VIN=6.0V, LX=CE=0V

ILIML

IFBH

IFBL

ILxH

0.1

1.0

ILxL

-1.0

Data Sheet

DC000019

XC9223/9224 Series

1A Driver Transistor Built-In Step-Down DC/DC Converters

Preliminary

ꢀELECTRICIAL CHARACTERISTICS (Continued)

XC9223B081xx (Continued)

Topr=25 C

PARAMETER

SYMBOL

VDF

VDR

VHYS

IDOUT

TDLY

IVDINH

IVDINL

IVDOUTH

IVDOUTL

CONDITIONS

Voltage which VDOUT becomes ”H”D”L”

Voltage which VDOUT becomes ”L”D”H”

VHYS=(VDR-VDF)/VDF x 100

VDIN=VDF x 0.9, apply 0.5V to VDOUT

Time until VDOUT becomes “L” D “H”

VIN=CE=VDIN=6.0V

VIN=CE=6.0V, VDIN=0V

VIN=VDIN=VDOUT=6.0V

VIN=VDIN=6.0V, VDOUT=0V

MIN.

-0.1

-1.0

TYP.

0.700

0.745

2.5

MAX.

0.1

1.0

UNIT

CIRCUIT

Detect Voltage

Release Voltage

Hysteresis Voltage

Output Current

Delay Time

VDIN “H” Current

VDIN “L” Current

VDOUT “H” Current

VDOUT “L” Current

µA

Test Condition: Unless otherwise stated, VIN=3.6V.

NOTE:

*1: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.

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

*2: Including hysteresis operating voltage range.

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

*4: On resistance (Ω)= Lx pin measurement voltage / 100mA

*5: Time until it short-circuits Lx with GND through 1Ω of resistance from a state of operation and is set to Lx=Low from current limit pulse generating.

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

*7: When temperature is high, a current of approximately 50µA (maximum) may leak.

ꢀOPERATIONAL EXPLANATION

Each unit of the XC9223/9224 series consists of a reference voltage source, a ramp wave circuit, error amplifier, PWM comparator, phase compensation

circuit, output voltage adjustment resistors, P-channel MOS driver transistor, N-channel MOS synchronous rectification switching transistor, current limiter

circuit, U.V.L.O. circuit and others. The series compares, using the error amplifier, the internal reference voltage to the CE pin with the voltage fedback from

the VOUT pin via resistors RFB1 and RFB2. 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 1.0MHz and 2.0MHz. 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

resistors (RFB1 and RFB2). 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.

Data Sheet

DC000019

XC9223/9224 Series

1A Driver Transistor Built-In Step-Down DC/DC Converters

Preliminary

ꢀOPERATIONAL EXPLANATION (Continued)

The current limiter circuit of the XC9223/9224 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. For the current limit values, please select the

values either from 1.5A (MIN.) when the LIM pin is high level or 0.5A (MIN.) when the LIM pin is low level.

1When 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 time.

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

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

4When 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 1through 3. If an over current state continues for several msec 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.

After being put into suspension mode, the IC can resume operation by turning itself off once and then starting it up using the CE pin, or by restoring power to

the VIN pin. Integral latch time may be released from a current limit detection state because of the noise. Depending on the state of a substrate, it may

result in the case where the latch time may become longer or the operation may not be latched. Please locate an input capacitor as close as possible.

Limit < # mS

Limit > # mS

Current Limit LEVEL

0mA

IDOUT

DCOUT

VSS

Restart

VIN

For protection against heat damage of the ICs, thermal shutdown function monitors chip temperature. The XC9223/9224 series build in three protection

functions: integral latch protection, thermal shutdown, and short-circuit protection. The thermal shutdown circuit starts operating and the driver transistor

will be turned off when the chip’s temperature reaches 150^OC. When the temperature drops to 130^OC or less after shutting of the current flow, the IC

performs the soft start function to initiate output startup operation.

<Short-Circuit Protection>

The short-circuit protection circuit monitors FB voltage. In case where output is accidentally shorted to the Ground and when the FB voltage decreases less

than half of the FB voltage, the short-circuit protection operates to turn off the driver transistor. In suspension mode, the operation can be resumed by

either turning the IC off and on via the CE/MODE pin, or by restoring power supply to the VIN pin.

The detector block of the XC9223/9224 series detects a signal inputted from the VDIN pin by the VDOUT pin.

<U.V.L.O. Circuit>

When the VIN pin voltage becomes 1.4V 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 1.8V 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.

A MODE/SYNC pin has two functions, a MODE switch and an input of external clock signal. The MODE/SYNC pin operates as the PWM mode when

applying high level of direct current and the PFM/PWM automatic switching mode by applying low level of direct current, which is the same function as the

normal MODE pin. By applying the external clock signal (±25% of the internal clock signal, ON Duty 25% to 75%), the MODE/SYNC pin switches to the

internal clock signal. Also the circuit will synchronize with the falling edge of external clock signal. While synchronizing with the external clock signal, the

MODE/SYNC pin becomes the PWM mode automatically. If the MODE/SYNC pin holds high or low level of the external clock signal for several µS, the

MODE/SYNC pin stops synchronizing with the external clock and switches to the internal clock operation.

Data Sheet

DC000019

XC9224B082AR [TOREX]

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