TOREX XC9220, XC9221 User Manual

100

XC9220/XC9221 Series

ETR0511-011

16V Input Voltage, Step-Down DC/DC Controller ICs.

■GENERAL DESCRIPTION

The XC9220/XC9221 series is a group of multi-purpose step-down DC/DC controller ICs. The ICs enable a high efficiency, stable power supply with an output current up to 3A to be configured using only a transistor, a coil, a diode, and two capacitors connected externally. Low ESR capacitors such as a ceramic capacitor can be used as an output capacitor. The XC9220/XC9221 series has a 0.9V (±1.5%) reference voltage, and using externally connected resistors, the output voltage can be set freely. With an internal switching frequency of 300kHz and 500kHz 1.0MHz, small external components can also be used. The XC9220 series is PWM control, and the XC9221 series is PWM/PFM mode, which automatically switches from PWM to PFM during light loads and high efficiencies can be achieved over a wide range of load conditions. As for the soft-start time, the XC9220/XC9221A and C series is internally set to 4msec and the XC9220/XC9221B and D series can be externally set-up. With the built-in UVLO (Under Voltage Lock Out) function, the external P-channel driver transistor is forced OFF when input voltage becomes 2.3V or lower.

■APPLICATIONS

●Set top boxes

●Digital TVs

●DVD/HDD recorders

●Portable information terminals

●Notebook computers

■TYPICAL APPLICATION CIRCUIT

* RSENSE : Tantalum and electrolytic capac itors can be used, in w hich cas e, RSENSE becomes unneces sary.

CE GND FB

1 2 3

EXT

5 4

SBD

Pc h

MOS FET

RSENSE

( for ceramic CL )

■FEATURES

Operating Voltage Range : 2.8V ~ 16.0V Output Voltage Externally Set Range (V

: 1.2V or more

=0.9V+1.5%)

Output Current : Less than 3.0A Oscillation Frequency : 300kHz, 500kHz, and 1.0MHz Control Methods : PWM control (XC9220)

PWM/PFM automatic switching (XC9221)

Soft-Start Function : 4ms, internally set

Protection Circuits

Low ESR Capacitor Compatible

(XC9220/XC9221A, 500kHz)

Externally set

(XC9220/XC9221B)

: Integral protection (1.0 ms)

(XC9220/XC9221 Aand B series) Short-circuit protection

: Ceramic capacitor

Operating Ambient Temperature : - 40℃~ + 85℃ Packages

: SOT-25

USP-6C

Environmentally Friendly :

EU RoHS Compliant, Pb Free

■TYPICAL PERFORMANCE

CHARACTERISTICS

●Efficiency vs. Output Current

XC9221A095MR (VOUT=3.3V, FOSC=500kHz)

PchMOSFET: CPH3308 (SANYO), CDD=1.0μF (ceramic), RIN=10Ω

OUT

FB1

FB2

EFFI (%)

Efficienc y

0.1 1 10 100 1000 10000

CIN=47μF (OS-Con), CL=47μF (OS-Con),

L=10μH (CDRH8D43, SUMIDA)

VIN=5.0V

VIN=12 .0V

Output Current　IO UT ( m A)

VIN=16 .0V

1/22

XC9220/XC9221 Series

■PIN CONFIGURATION

■PIN ASSIGNMENT

■PRODUCT CLASSIFICATION

●Ordering Information

XC9220①②③④⑤⑥-⑦ XC9221①②③④⑤⑥-⑦

DESIGNATOR ITEM SYMBOL DESCRIPTION

5 4

1 2 3

CE/CSSV

SOT-25

(TOP VIEW)

PIN NUMBER

SOT-25 USP-6C

EXT/V

* The dissipation pad for the USP-6C package

(preliminary) 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

USP-6C

(BOTTOM VIEW)

PIN NAME FUNCTION

1 6 CE/CSS Chip Enable / Soft-Start 2 5 VSS Ground 3 4 FB Output Voltage Sense 4 3 EXT/ External Transistor Drive

- 2 NC No Connection

5 1 VIN Power Supply

(*1)

: PWM control

(*1)

: PWM/PFM automatic switching control

A Soft-start internally set with integral protection function

①

Type of DC/DC Controller

ICs

B Soft-start externally set with integral protection function

C Soft-start internally set without integral protection function

D Soft-start externally set without integral protection function

SS (No.5) pin.

②③ Output Voltage 09 FB Voltage (Fixed)

3 300kHz

④ Oscillation Frequency

5 500kHz

A 1.0MHz

MR SOT-25 (3,000/Reel)

⑤⑥-⑦

(*1)

Packages (Order Unit)

MR-G SOT-25 (3,000/Reel)

ER USP-6C (3,000/Reel)

ER-G USP-6C (3,000/Reel)

(*1)

The “-G” suffix denotes Halogen and Antimony free as well as being fully RoHS compliant.

2/22

■BLOCK DIAGRAMS

●XC9220/21A and C series ● XC9220/21B and D series

XC9220/XC9221

Series

VIN

CE/CSS

* Diodes inside the circuits are ESD protection diodes and parasitic diodes.

■ FUNCTIONS

CHIP ENABLE

IC OPERATION

H Operation ON

L Operation OFF

PRODUCT TYPE

A B C D

Soft-start externally set No Yes No Yes

Integral protection function Yes Yes No No

■ ABSOLUTE MAXIMUM RATINGS

PAR AMETER SYMBOL RATINGS UNITS

VIN Pin Voltage VIN

FB Pin Voltage VFB

CE/CSS Pin Voltage CE

-0.3 ～ +18.0

EXT/ Pin Voltage VEXT - 0.3 ~ VIN + 0.3 V

EXT/ Pin Current IEXT + 100 mA

Power Dissipation

SOT-25 250

USP-6C

120

Operating Ambient Temperature Topr - 40 ~ + 85

Storage Temperature Tstg - 55 ~ +125

Under Voltag e

Lock Out

Short Circuit

Protection

VREF

0.9V

Chip Enable

Soft Start (internal)

Err Amp

Each circuit

U.V.L.O

MaxDutyLimit

Protection

PWM

Comparator

Ramｐ

RS Latch

LOGIC

Wave

Each circuit

Buffer

PWM/PFM Control LOGIC OSC Enable

OSC

Frequency :

1 MHz, 500 kHz , 300 kHz

PWM Wave

(XC9221series)

EXT

VSS

Ta = 25OC

3/22

XC9220/XC9221 Series

■ELECTRICAL CHARACTERISTICS

XC9220/XC9221 A and C series

PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT.

FB Voltage VFB 0.8865 0.9000 0.9135 V 2

Input Voltage Range VIN 2.8 - 16.0 V -

UVLO Voltage

(Minimum Operating Voltage)

Supply Current 2 IDD2 VIN=5.0V, FB=1.0V ** μA 1 Stand-by Current ISTB - 0.1 1.0 μA 1

Oscillation Frequency fOSC

Maximum Duty Ratio MAXDTY 100 - - % 2

PFM Duty Ratio PFMDTY No load (XC9221 series only) 15 25 35 % 3

EXT/ High On Resistance REXTBH 6 10 16 Ω 4

EXT/ Low On Resistance REXTBL 6 12 20 Ω 4

Integral Protection Time

(*2)

Short-Circuit Protection VSHORT - - 0.7 V 2

Soft-Start Time tSS ** ms 2

Efficiency (*1) EFFI - 92 - % 3

Temperature Characteristics

CE “High” Level Voltage VCEH 1.2 - - V 2

CE “Low” Level Voltage VCEL - - 0.3 V 3

CE “High” Level Current ICEH VIN=CE=16V - 0.1 - 0.1 μA 1 CE “Low” Level Current ICEL VIN=16V, CE=0V - 0.1 - 0.1 μA 1 FB “High” Level Current IFBH VIN=FB=16V - 0.1 - 0.1 μA 4

FB “Low” Level Current IFBL VIN=16V, FB=0V - 0.1 - 0.1 μA 4

Unless otherwise stated, V

NOTE:

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

*2: No Integral protection function is available with the XC9220/9221 C series.

** Refer to the CHARACTERISTICS CHART BY OSCILLATION FREQUENCY.

IN=5.0V

VUVLO 1.9 2.3 2.7 V 3

Connected to external

components

tPRO (XC9220/9221 A series) ** ms 2

UVFB FB Voltage

UToprVFB

- +100 -

** kHz 3

ppm

/OC

Ta = 2 5OC

CIRCUIT

4/22

■ELECTRICAL CHARACTERISTICS (Continued)

XC9220/XC9221 B and D series

XC9220/XC9221

Series

Ta = 2 5OC

PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT.

CIRCUIT

FB Voltage VFB 0.8865 0.9000 0.9135 V 2

Input Voltage Range VIN 2.8 - 16.0 V -

UVLO Voltage

(Minimum Operating Voltage)

VUVLO 1.9 2.3 2.7 V 3

Supply Current 2 IDD2 VIN=5.0V, FB=1.0V ** μA 1 Stand-by Current ISTB - 0.1 1.0 μA 1

Oscillation Frequency fOSC

Connected to external

components

** kHz 3

Maximum Duty Ratio MAXDTY 100 - - % 2

PFM Duty Ratio PFMDTY No load (XC9221 series only) 15 25 35 % 3

EXT/ High On Resistance REXTBH 6 10 16 Ω 4

EXT/ Low On Resistance REXTBL 6 12 20 Ω 4

Integral Protection Time

(*4)

tPRO (XC9220/9221 B series) ** ms 2

Short-Circuit Protection VSHORT - - 0.7 V 2

Soft-Start Time tSS Connected to RSS and CSS 5.0 10.0 20.0 ms 5

Internal Soft-Start Time (*1) tSS_IN CE=VIN ** ms 2

Efficiency (*2) EFFI - 92 - % 3

Temperature Characteristics

CE “High” Level Voltage

(*3)

UVFB FB Voltage

UToprVFB

- +100 -

VCEH 2.6 - - V 2

ppm

/OC

CE “Low” Level Voltage VCEL - - 0.3 V 2

CE “High” Level Current ICEH VIN=CE=16V - 0.1 - 0.1 μA 1 CE “Low” Level Current ICEL VIN=16V, CE=0V - 0.1 - 0.1 μA 1 FB “High” Level Current IFBH VIN=FB=16V - 0.1 - 0.1 μA 4

FB “Low” Level Current IFBL VIN=16V, FB=0V - 0.1 - 0.1 μA 4

Unless otherwise stated, V

External components: C NOTE:

*1: Internal soft-start time: In case where the U.V.L.O. function operates temporarily due to the power cutoff etc. when an external C

charged (V

internal soft-start time. *2: EFFI={ (output voltage) x (output current) } / { (input voltage) x (input current) } x 100 *3: The integral latch and short-circuit protection do not function when the CE/C

*4: No Integral protection function is available with the XC9220/XC9221 D series.

** Refer to the CHARACTERISTICS CHART BY OSCILLATION FREQUENCY.

■CHARACTERISTICS CHART BY OSCILLATION FREQUECY

CE>2.6V), the IC restarts operation by the internal soft-start time. Minimum value of soft-start time set externally is equal to the

PAR AMETER SYMBOL

IN=5.0V

SS=0.1μF, R SS=200kΩ

SS is

SS pin voltage become lower than 2.6V while the soft-start time.

300kHz 500kHz 1.0MHz

MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX.

Supply Current 2 IDD2 - 25 50 - 25 50 - 40 80

Oscillation Frequency fosc 255 300 345 425 500 575 850 1000 1150

Integral Protection Time t

0.5 1.0 2.0 0.5 1.0 2.0 0.25 0.50 1.00

PRO

Soft-Start Time tSS 2 4 8 2 4 8 1 2 4

5/22

XC9220/XC9221 Series

■TYPICAL APPLICATION CIRCUITS

■OPERATIONAL EXPLANATION

The XC9220/XC9221 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase compensation circuit, protection circuits, UVLO 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 V 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 EXT pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage.

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

The oscillator determines switching frequency. The frequency is fixed internally and can be selected from 300kHz, 500kHz and 1.0MHz. 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 (FB pin 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 PWM comparator.

<Control Methods> The XC9220 series is PWM control, and the XC9221 series is PWM/PFM automatic switching mode. In the XC9220 series, it is controlled at a constant frequency from light load to heavy load. When a noise etc. is concerned, it is easy to set up a filter etc. since the frequency is fixed. On the other hand, the efficiency at the time of light load may fall. In the XC9221 series, the high efficiency can be drawn from PFM control at the time of light load. In PWM/PFM automatic switching mode, a control method is automatically changed from PWM control to PFM control at the time of light load. If coil current becomes discontinuous at the time of light load, ON time duty intends to reduce less than 25%. Therefore, the PFM circuit operates to output the pulse, which ON time duty fixed to 25% from the EXT/pin. The ON time duty is fixed when PFM operation. The pulse is outputted with the cycle suitable for the conditions at that time. In order that the number of times of switching per unit time may decrease, the efficiency, which it is at the light load time is improved. However, output cycle of the pulse cannot be fixed. For this, the circuit should be designed with this point in mind when using a noise filter etc. The conditions shifting to the PFM operation is depend on values of input voltage, load current, coil and so on.

6/22

● External Components Pch MOSFET: 2SJ646 (SANYO) SBD: DE5PC3 (SHINDENGEN) L: CDRH8D28-4R7 (4.7μH, SUMIDA / fosc=1.0MHz)

CDRH8D43-100 (10μH, SUMIDA / fosc=500kHz) CDRH127-220 (22μH, SUMIDA / fosc=300kHz)

CIN: 47μF (OS-CON, SANYO) CL: 47μF (OS-CON, SANYO)

OUT pin through split

)

XC9220/XC9221

■OPERATIONAL EXPLANATION (Continued

<UVLO (Under Voltage Lock Out) > When the input voltage becomes 2.3V (TYP.) or lower, the external P-channel driver transistor is forced OFF. Once

the UVLO operates, the XC9220/XC9221A and C series (soft-start internally set type) resets the internal circuit. For this, by releasing the UVLO function, the IC performs the soft-start function to initiate output startup operation. When the input voltage falls because of a power cutoff etc. and the IC stops operation due to the UVLO function, the IC resumes its operation by internal soft-start circuit of the XC9220/XC9221B and D series. If the soft-start time is needed to set externally, the CE/C

●UVLO Operation

U.V.L.O. (Internal Signal)

(XC9220/21A and C series)

(XC9220/21B and D series)

VIN

VOUT

<Soft-Start Time> The XC9220/XC9221B and D series can adjust the soft-start time externally via the CE pin. The soft-start function

operates until the CE pin voltage becomes 2.6V. Please refer to the following equation for calculating the soft-start time. Minimum soft-start time is equal to the time set internally.

SS= - CSS x RSS x In { (VCE – 2.2) / VCE }

Rss

CE/CSS PIN

VCE

Css

Rss

VCE

> Circuit Examle2 : CMOS logic (low current dissipation)

ON/OFF

Signal

CE/CSS

Css

SS pin voltage should be reset to 0V. (Please see the soft-start circuit example.)

U.V.L.O. operation

U.V .L. O.

release delay

Soft-s tart time: Tss1

XC9220/21A series

XC9220/21B series

VCE

ON/OFF

Signal

Rss

Soft-s tart time (Externally s et-up) :Tss 2

Internal

sotf-start time:Tss1

(XC9220/21A series)

Externally set

soft-star t time: Tss 2

(XC9220/21A series)

Minimum soft-start time

when externally set:

Tss2_min = Tss1

> Cicuit Examle3 : CMOS logic (low current dissipation, quick off)> Circuit Example1 : N-ch Open Drain

ON/OFF

Signal

CE/CSS

Css

release delay

VCE

U.V .L. O.

Soft-s tart time:Tss1

Rss

CE/CSS

Css

Series

7/22

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TOREX XC9220, XC9221 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual