TOREX XC9254R User Manual

XC9254R Series

ETR0529-002

600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converter

☆GreenOperation Compatible

■GENERAL DESCRIPTIO N

The XC9254R series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42ΩP-channel MOS driver transistor and 0.52ΩN-channel MOS switching transistor, designed to allow the use of ceramic capacitors. Operating voltage range is from 2.0V to 6.0V. The XC9254R001 type has a fixed output voltage of 1.2V (accuracy: ±2.0%). The device provides a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected externally. With the built-in oscillator, 1.2MHz is fixed internally. As for operation mode, the XC9254 R series is automatic PWM/PFM switching control allowing fast response, low ripple and high efficiency over the full range of loads (from light load to heavy load). The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF when input voltage becomes 1.4V or lower. Two types of package SOT-25 and USP-6C are available.

■APPLICATIONS

●Mobile phones, Smart phones

●Bluetooth headsets

●Mobile WiMAX PDAs, MIDs, UMPCs

●Portable game consoles

●Digital cameras, Camcorders

●MP3 Players, Portable Media Players

●Notebook computers

■TYPICAL APPLICA TION CIRCUIT

■FEATURES

Driver Transistor Built-In

Input Voltage : 2.0V ~ 6.0V Output Voltage : 1.2V High Efficiency : 92% (TYP.) Output Current : 600mA Oscillation Frequency : 1.2MHz (+15%) Maximum Duty Cycle : 100% Control Methods : PWM/PFM Auto Function : Current Limiter Circuit Built-In

C Capacitor

Operating Ambient Temperature Packages : SOT-25, USP-6C

Environmentally Friendly : EU RoHS Compliant, Pb Free

* Performance depends on external components and wiring on the PCB.

: 0.42Ω P-ch driver transisto r

0.52Ω N-ch switch transistor

(Constant Current & Latching)

Discharge

: Low ESR Ceramic Capacitor : -40℃ ～ +85℃

1/17

XC9254R Series

■PIN CONFIGURATION

Lx VOUT

5 4

132

VSS CE/MODEVIN

CE/MODE 4

VIN 6

VSS 5

1 Lx

2 VSS

3 VOUT (FB)

SOT-25

(Top View)

■PIN ASSIGNMENT

PIN NUMBER

SOT-25 USP-6C

1 6 VIN Power Input 2 2, 5 VSS Ground 3 4 CE High Active Enable 4 3 VOUT Fixed Output Voltage Pin 5 1 Lx Switching Output

USP-6C

(BOTTOM VIEW)

* Please short the VSS pin (No. 2 and 5). * The dissipation pad for the USP-6C 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 V

(No. 5) pin.

PIN NAME FUNCTION

2/17

■PRODUCT CLASSIFICATION

●Ordering Information

PWM / PFM automatic switching control

(*1)

The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.

PRODUCT NAME PACKAGE (ORDER UNIT)

XC9254R001MR-G

XC9254R001ER-G

(*1)

SOT-25 (3,000/Reel)

(*1)

USP-6C (3,000/Reel)

XC9254R

Series

3/17

XC9254R Series

■BLOCK DIAGRAM

VOUT

VIN

VSS

CFB

Error Amp.

VSHORT

Vref with Soft Start, CE

UVLO

Phase Compensation

PWM/PFM Selector

UVLO Cmp

PWM Comparator

Current Feedback Current Limit

Logic

CE Control Logic

Synch Buffer Drive

Ramp Wave Generator OSC

CE/

NOTE:

■

The signal from CE Control Logic to PWM/PFM Selector is being fixed to "H" level inside, and XC9254R series chooses only PWM/PFM automatic switching control. Diodes inside the circuit are ESD protection diodes and parasitic diodes.

BSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL RATINGS UNIT

VIN Pin Voltage VIN - 0.3 ~ 6.5 V

Lx Pin Voltage VLx - 0.3 ~ VIN + 0.3 ≦ 6.5V V

Pin Voltage V

OUT

CE Pin Voltage VCE - 0.3 ~ 6.5 V

Lx Pin Current ILx ±1500 mA

SOT-25 250 Power Dissipation

(*Ta=25℃)

USP-6C

Operating Ambient Temperature Topr - 40 ~ + 85

Storage Temperature Tstg - 55 ~ + 125

- 0.3 ~ 6.5 V

OUT

100

Ta=25℃

4/17

XC9254R

■ELECTRICAL CHARACTERISTICS (Continued)

XC9254R Series, V

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

Output Voltage V

Operating Voltage Range VIN 2.0 - 6.0 V ①

Maximum Output Current I

UVLO Voltage V

Supply Current IDD V

Stand-by Current I

Oscillation Frequency f

PFM Switching Current I

PFM Duty Limit

Maximum Duty Cycle

Minimum Duty Cycle

Efficiency

Lx SW "H" ON Resistance 1 R Lx SW "H" ON Resistance 2 R

Lx SW "L" ON Resistance 1 R Lx SW "L" ON Resistance 2 R

Lx SW "H" Leak Current

Current Limit

Output Voltage

Temperature Characteristics

CE "H" Voltage V

CE "L" Voltage V

CE "H" Current I

CE "L" Current I Soft Start Time tSS

Latch Time t

Short Protection Threshold

Test conditions: Unless otherwise stated, VIN=5.0V, V NOTE:

Voltage

CL Discharge R

*1: Including hysteresis operating voltage range. *2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100 *3: ON resistance (Ω)= (V *4: R&D value *5: When temperature is high, a current of approximately 10μA (maximum) may leak.

*6: Time until it short-circuits V *7: When V *8: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.

*9: Current limit denotes the level of detection at peak of coil current.

*10: “H”=V

*11: V

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

IN~VIN

is applied when V

=1.2V, f

OUT

(*2)

EFFI

(*5)

(*9)

is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.

-1.2V, “L”=+0.1V~-0.1V

OUT (E)

=1.2MHz, Ta=25℃

OSC

When connected to external components,

DTY

OUT

OUTMAX

UVLO

STB

OSC

PFM

LIMIT_PFM

DTY

=5.0V, I

IN=VCE

IN=VOUT(E)

When connected to external components

=VIN, V

Voltage which Lx pin holding “L” level

=5.0V, V

IN=VCE

VIN=5.0V, VCE=0V, V

When connected to external components, V

IN=VOUT(E)

When connected to external components, V

IN=VOUT(E)

=2.0V, I

CE=VIN

MAX

MIN

IN=VCE

=5.0V, V =5.0V, V

=30mA

OUT

+2.0V, VCE=1.0V,

OUT=VOUT(E)

×0.5V

OUT=VOUT(E)

+2.0V, VCE =1.0V, I

+2.0V, VCE =VIN, I

=1mA 200 % ①

OUT

OUT=VOUT(E) OUT=VOUT(E)

(*8)

(*11)

(*1, *10)

×1.1V - 15 33 μA ③

×1.1V - 0 1.0 μA ③

=100mA

OUT

=1mA

OUT

×0.9V 100 - - % ② ×1.1V - - 0 % ②

When connected to external components,

CE=VIN=VOUT(E)

VIN=VCE=5.0V, V

LxH

VIN=VCE=3.6V, V

LxH

VIN=VCE=5.0V

LxL

VIN=VCE=3.6V

LxL

VIN=V

LeakH

LIM

△V

OUT

・△Topr)

OUT

CEH

CEL

VIN=VCE=5.0V,

CEH

VIN=5.0V, VCE=0V,

CEL

IN=VCE

OUT

Voltage changes Lx to “H” level V

OUT

Voltage changes Lx to “L” level

OUT

=30mA, -40℃≦Topr≦85℃ - ±100 -

+1.2V, I

OUT (E)

(*4)

- 0.45 0.66 Ω ④

(*4)

=100mA

OUT

×0.9V , ILx=100mA ×0.9V , ILx=100mA

(*3)

=5.0V, VCE=0V, Lx=0V - 0.01 1.0 μA ⑤

=5.0V, V

OUT(E)

OUT=VOUT(E)

×0.9V, Applied voltage to VCE,

×0.9V, Applied voltage to VCE ,

OUT

OUT(E)

OUT

OUT(E)

(*7)

×0.9V

900 1050 1350 mA ⑥

(*10)

×0.9V - 0.1 - 0.1 μA ⑤

When connected to external components, V

=0V → VIN, I

=5.0V, V

LAT

IN=VCE

Short Lx at 1Ω resistance Sweeping V

SHORT

DCHG

- Lx pin measurement voltage) / 100mA

with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.

OUT

x 0.5V becomes more than VIN.

resistance, V

level within 1ms

VIN=5.0V, LX=5.0V, VCE=0V, V

=Nominal Voltage, applied voltage sequence is V

OUT(E)

=1mA

OUT

=0.8×V

OUT

, VIN=VCE=5.0V, Short Lx at

OUT

voltage which Lx becomes “L”

OUT

OUT(E)

(*6)

=open 200 300 450 Ω ⑧

OUT

1.176 1.200 1.224 V ①

600 - - mA ①

1.00 1.40 1.78 V ②

1020 1200 1380 kHz ①

140 180 240 mA ①

- 92 - % ①

- 0.35 0.55 Ω ④

- 0.42 0.67 Ω ④

- 0.52 0.77 Ω -

0.65 - 6.0 V ③

0.5 1.0 2.5 ms ①

1.0 - 20.0 ms ⑦

0.675 0.900 1.150 V ⑦

OUT→VIN→VCE

ppm/

- 0.25 V ③

℃

Series

CIRCUIT

①

5/17

XC9254R Series

■TYPICAL APPLICATION CIRCUIT

OUT

600mA

(ceramic)

VSS

VOUT

VSS

CE/

MODE

(ceramic)

CE/ MO DE

●f

=1.2MHz

OSC

CL:

4.7μH

4.7μF 10μF

CIN:

(NR4018, TAIYO YUDEN) (Ceramic) (Ceramic)

6/17

XC9254R

Series

■OPERATIONAL DESCRIPTION

The XC9254R series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOS driver transistor, N-channel MOS switching transistor for the synchronous switch, current limiter circuit, UVLO circuit and others. (See the block diagram above.) The series ICs compare, using the error amplifier, the voltage of the internal voltage reference source with the feedback voltage from the V 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 ensu ring stable output voltage.

<Reference Voltage Source> The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.

<Ramp Wave Circuit> The ramp wave circuit determines switching frequency. The frequency is fixed internally as 1.2MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal circuits.

<Error Amplifier> 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, R1 and R2. When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier increases. The gain and frequency characteristics o f the error amplifier output are fixed internally to deliver an optimized signal to the mixer.

<Current Limit> The current limiter circuit of the XC9254R series monitors the current flowing through the P-channel MOS driver transistor connected to the Lx pin, and features a combination of the current limit mode and the operation suspension mode.

① When the driver current is greater than a specific level, the current limit function operates to turn off the pulses from the Lx 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 ④ When the over current state is eliminated, the IC resumes its normal operation.

OUT pin through split resistors, R1 and R2. Phase compensation is performed on the resulting error amplifier output,

pin at any given timing.

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

few ms 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/MODE pin, or by restoring power to the V not mean a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. T he current limit of the XC9254R series can be set at 1050mA at typical. Besides, care must be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode. Depending on the state of the PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect of noise, the board should be laid out so that input capacitors are placed as close to the IC as possible.

pin. The suspension mode does

7/17

XC9254R Series

■OPERATIONAL DESCRIPTION (Continued)

<Short-Circuit Protection> The short-circuit protection circuit monitors the internal R1 and R2 divider voltage from the V the block diagram shown in the previous page). In case where output is accidentally shorted to the Ground and when the FB point voltage decreases less than half of the reference voltage (Vref) and a current more than the I the Pch MOS driver transistor, the short-circuit protection quickly operates to turn off and to latch the driver transistor. In latch mode, the operation can be resumed by either turning the IC off and on via the CE pin, or by restoring power supply to the V When sharp load transient happens, a voltage drop at the V short circuit protection may operate in the voltage higher than 1/2 V

<UVLO Circuit> When the V prevent false pulse output caused by unstable operation of the interna l circuitry. When the V or higher, switching operation takes place. By releasing the UVLO function, the IC performs the soft start function to initiate output startup operation. The soft start function operates even when the VIN pin volta ge falls momentarily below the UVLO operating voltage. 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.

<PFM Switch Current> In PFM control operation, until coil current reaches to a specified level (I on. In this case, time that the Pch MOS driver transistor is kept on (t

= L×IPFM / (VIN－VOUT) →IPFM①

< PFM Duty Limit > In PFM control operation, the PFM duty limit ( duty increases (e.g. the condition that the step-down ratio is small), it’s possible for Pch MOS driver transistor to be turned off even when coil current doesn’t reach to IPFM. →IPFM②

pin.

IN pin voltage becomes 1.4V or lower, the Pch MOS driver transistor output driver transistor is forced OFF to

DTY

LIMIT_PFM

Ton

is propagated to the FB point through CFB, as a result,

OUT

voltage.

OUT

PFM), the IC keeps the Pch MOS driver transistor

) can be given by the following formula.

) is set to 200% (TYP.). Therefore, under the cond ition that the

PFM Duty Limit

PFMデューティ制限

pin (refer to FB point in

OUT

flows to

LIM

pin voltage becomes 1.8V

I Lx

図 IPFM ①

PFM

0mA

I Lx

FOSC

OSC

図 IPFM ②

IPFM

0mA

8/17

XC9254R

■OPERATIONAL DESCRIPTION (Continued)

＜CL High Speed Discharge＞

The XC9254R series can quickly discharge the electric charge at the outpu t capacitor (C which enables a whole IC circuit put into OFF state, is inputted via the Nch MOS switch transistor located between the L pin and the VSS pin. When the IC is disabled, electric charge at the output capacitor (CL) is quickly discharged so that it may avoid application malfunction. Discharge time of the output capacitor (C and the output capacitor (C value (CL) as τ(τ=C x R), discharge time of the output voltage after discharge via the N channel transistor is calculated by the following formulas.

V = V

OUT(E)

V : Output voltage after discharge V

OUT(E)

t: Discharge time, τ: C x R

–t/

x e

or t=τln (V

: Output voltage

C= Capacitance of Output capacitor (CL) R= C

auto-discharge resistance

). By setting time constant of a CL auto-discharge resistance value (R) and an output capacitor

/ V)

OUT(E)

) is set by the CL auto-discharge resistance (R)

) when a low signal to the CE pin

Series

Output Voltage Dischage Characteristics

Rdischg

100

0 102030405060708090100

= 300Ω TYP

（）

CL=10uF

CL=20uF

CL=50uF

Discharge Time t (ms)

9/17

XC9254R Series

■OPERATIONAL DESCRIPTION (Continued)

<CE Pin Function> The operation of the XC9254R series will enter into the shut do wn mode when a low level signal is input to the CE pin. Durin g the shutdown mode, the current consumption of the IC becomes 0μA (TYP.), with a state of high impedance at the Lx pin and V

OUT 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.).

●Examples of how to use CE pin

(A)

SW＿CE

ON Stand-by

OFF Operation

(B)

SW＿CE

ON Operation

OFF Stand-by

<Soft Start> The XC9254R series provide 1.0ms (TYP).

Soft start time is defined as the time interval to reach 90% of the output voltage from the time when the CE pin is turned on.

■FUNCTION CHART

CE VOLTAGE LEVEL OPERATIONAL STATES

10/17

STATUS

tSS

Synchronous

H Level

L Level Stand-by

PWM/PFM

Automatic Switching

(A)

90% of setting voltage

(B)

XC9254R

Series

■NOTE ON USE

1. The XC9254R series is designed for use with ceramic output capacitors. If, however, the potential difference is too large between the input voltage and the output voltage, 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. Depending on the input-output voltage differential, or load current, some pulses may be skipped, and the ripple voltage may increase.

4. When the difference between V possibility that some cycles may be skipped completely.

5. When the difference between V there is the possibility that some cycles may be skipped completely.

6. With 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 operation, 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:

Ipk = (V L: Coil Inductance Value f

7. When the peak current which exceeds limit current flows within the specified time, the built-in Pch MOS driver transistor turns off. 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 external components such as a coil.

8. When V

9. Care must be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode. Depending on the state of the PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect of noise, the board should be laid out so that input capacitors are placed as close to the IC as possible.

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

11. This IC should be used within the stated absolute maximum ratings in order to prevent damage to the device.

12. When the IC is used in high temperature, output voltage may increase up to input voltage level at no load because of the

leak current of the driver transistor.

13. The current limit is set to 1350mA (MAX.)

①Current flows into Pch MOS driver transistor to reach the current limit (I

②The current of ILIM or more flows since the delay time of the circuit occurs during from t he detection of the current lim it to ③Because of no potential difference at both ends of the coil, the time rate of coil current becomes quite small.

④Lx oscillates very narrow pulses by the current limit for several ms.

⑤The circuit is latched, stopping its operation.

IN - VOUT) x OnDuty / (2 x L x f

: Oscillation Frequency

OSC

IN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.

current limit functions while the VOUT pin is shorted to the GND pin, when Pch MOS driver transistor is ON, the potential difference for input voltage will occur at both ends of a coil. For this, the time rate of coil current becomes large. By contrast, when Nch MOS driver transistor is ON, there is almost no potential difference at both ends of the coil since the

OUT pin is shorted to the GND pin. Consequently, the time rate of coil current becomes quite small. According to the

V repetition of this operation, and the delay time of the circuit, coil current will be converged on a certain current value, exceeding the amount of current, which is supposed to be limited originally. Even in this case, however, after the over current state continues for several ms, the circuit will be latched. A coil should be used within the stated absolute maximum rating in order to prevent damage to the device.

OFF of Pch MOS driver transistor.

ILIM

ILX

IN and VOUT is large in PWM control, very narrow pulses will be outputted, and there is the IN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and

) + IOUT

OSC

at typical. However, the current of 1350mA or more may flow. In case that the

LIM).

④

Limit > # mS

⑤

①

②

③

Delay

11/17

XC9254R Series

■NOTE ON USE (Continued)

14. In order to stabilize VIN’s voltage level and oscillation frequency, we recommend that a by-pass capacitor (CIN) be connected as close as possible to the V

15. High step-down ratio and very light load may lead an intermittent oscillation.

16. During PWM / PFM automatic switching mode, operating may become unstable at transition to continuous mode. Please verify with actual parts.

17. Please note the inductance value of the coil. The IC may enter unstable operation if the combination of ambient temperature, setting voltage, oscillation frequency, and L value are not adequate. In the operation range close to the maximum duty cycle, The IC may happen to enter unstable output voltage operation even if using the L values listed below.

●The Range of L Value

OSC

1.2MHz V

*When a coil less value of 4.7μH is used at f current limit I

. In this case, it may happen that the IC can not provide 600mA output current.

LMI

OUT

=1.2V

18. It may happen to enter unstable operation when the IC operation mode goes into continuous op eration mode under the condition of small input-output voltage difference. Care must be taken with the actual design unit.

IN & VSS pins.

L Value

3.3μH～6.8μH

=1.2MHz, peak coil current more easily reach the

OSC

12/17

XC9254R

■NOTE ON USE (Continued)

●Instructions of pattern layouts

1. In order to stabilize VIN voltage level, we recommend that a by-pass capacitor (CIN) be connected as close as possible to the VIN & VSS pins.

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 IC.

5. This series’ internal driver transistors bring on heat because of the output current and ON resistance of driver transistors.

XC9235/36/37A,B,C（出力電圧固定品）

(PKG:SOT-25)

XC9235/36/37A,B,C,E,G（出力電圧固定品）

(PKG: USP-6C)

(PKG:USP-6C/USP-6EL)

Series

VIN

CIN

VSS

For the VIN, V

VOUT

VSS

, VSS/CE, please put the wire.

OUT

。VIN,VOUT,VSS,CEには使用しやすいように電線等を付けてご使用下さい

Ceramic_Cap

インダクタ

Inductor

VOUT

VSS

For the VIN, V

CIN

VIN

VSS

, VSS/CE, please put the wire.

OUT

。VIN,VOUT,VSS,CEには使用しやすいように電線等を付けてご使用下さい

Ceramic_Cap

Inductor

インダクタ

13/17

XC9254R Series

■TEST CIRCUITS

< Circuit No.1 > ・A/B/C/E/G series ・D/F series

CIN

VIN Lx

CE/MODE VOUT

VSS

※ Exte rnal Components

L : 1.5uH(NR3015) 3.0MHz

4.7uH(NR4018) 1.2MHz

CIN : 4.7μF(ceramic) CL :10μF(ceramic)

< Circuit No.2 >

1uF

VIN Lx

VSS

VOUT

(FB)

CE/MODE

< Circuit No.4 >

1uF

VIN Lx

VSS

VOUT

(FB)

CE/MODE

< Circuit No.6 >

1uF

VIN Lx

VSS

VOUT

(FB)

CE/MODE

< Circuit No.8 >

1uF

VIN Lx

VSS

VOUT

(FB)

CE/MODE

Wave Form Measure Point

ON resistance = (VIN-VLx)/100mA

Wave Form Measure Point

ILx

< Circuit No.3 >

< Circuit No.5 >

100mA

< Circuit No.7 >

ILIM

< Circuit No.9 >

※ Exte rnal Components

L : 1.5μH(NR4018) 3.0MHz V : 4.7μH (NR3015) 1.2MH z CIN : 4.7μF CL : 10μF R1 : 150kΩ R2 : 300kΩ Cfb : 120pF

1uF

VIN Lx

CIN

CE/MODE

1uF

ICEH

ICEL

1uF

CIN

VIN Lx

CE/MODE

VIN Lx

CE/MODE

VIN Lx

CE/MODE

VIN Lx

CE/MODE

VSS

OUT=VFB×(R1+R2)/R2

VSS

VOUT

(FB)

VOUT

(FB)

Wave Form Measure Point

Cfb

Wave Form Measure Point

Rpulldown 200Ω

Wave Form Measure Point

Ilat

Rpulldown 1Ω

IOUT

14/17

■PACKAGING INFORMATION

●SOT-25

●USP-6C Reference Pattern Layout

0.05

2.4

0.45

0.05

1.0

0.45

●USP-6C

●USP-6C Reference Metal Mask Design

XC9254R

Series

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XC9254R Series

■MARKING RULE

●SOT-25, USP-6C

SOT-25

(TOP VIEW)

④ ⑤

② ③①

USP-6C/USP-6EL

USP-6C

(Top View)

(TOP VIEW)

① represent product series

PRODUCT SERIES MARK

XC9254R L

② represents integer numb er of output voltage and oscillation frequency

MARK OUTPUT

VOLTAGE (V)

=1.2MHz

OSC

1.X B

③ represents decimal point of output voltage

(V) MARK

OUT

X.20 2

④⑤ represents production lot number Order of 01, …09, 10, 11, …99, 0A, …0Z, 1A, …9Z, A0, …Z9, AA, …ZZ. (G, I, J, O, Q, W excluded) *No character inversion used.

16/17

XC9254R

Series

1. The products and product specifications contained he rein 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 dat asheet 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.

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TOREX XC9254R User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual