TOREX XC9119D10A User Manual

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XC9119D10A Series

ETR0408_007a

1MHz, PWM Controlled,
Step-Up DC/DC Converter, Ceramic Capacitor Compatible

GENERAL DESCRIPTIO N

The XC9119D10A series is 1MHz, PWM controlled step-up DC/DC converter, designed to allow the use of ceramic
capacitors. With a built-in 2.0Ω switching transistor, the XC91 19D10A series can easily provide a step-up operation by using
only a coil, a diode, a capacitor, and a resistor, connected externally.
Since output voltage up to 19.5V (Maximum Lx operating voltage: 20V) ca n be derived with reference voltage supp ly of 1.0V
(±2.0%) and external components, the series can easily supply high voltage for various general-purpose pow er supplies, LCD
panels and organic EL displays.
With a high switching frequency of 1.0MHz, a low profile and small boar d area solution can be achieved using a chip coil and
an ultra small ceramic output capacitor.
With the current limit function (400mA (TYP.): V
limited. Soft-start time can be adjusted by external resistors and capacitors. The stand-by function enables the output to
be turned off (CE ’L’), that is, the supply current will be less than 1.0μA.

■APPLICATIONS

●Organic electroluminescence display (OELD)

●Power supplies for LCD panels

●Various general-purpose power supplies

TYPICAL APPLICATION CIRCUIT

DD=3.6V), a peak current, which flows through built-in driver transistors can be

FEATURES

Operating Voltage Range : 2.5V ~ 6.0V
Output Voltage Range : Up to 19.5V externally set-up

: Reference voltage 1.0V +

Oscillation Frequency : 1.0MHz±20%
ON Resistance : 2.0Ω (V
Efficiency : 86%

Control : PWM control
Stand-by function : I
Load Capacitor : Low ESR ceramic capacitor
Ultra Small Packages : SOT-25, USP-6C
Lx Limit Current : 400mA (V

(V

DD=3.6V, VDS=0.4V)

OUT

=15V, VDD=3.6V, I

=1.0μA (MAX.)

STB

=3.6V)

DD

OUT

=10mA)

TYPICAL PERFORMANCE

CHARACTERISTICS

○Efficiency vs. Output Current

XC9119D10A

100

90
80
70
60
50
40
30
20

Efficiency: EFFI(%)

10

0

0.1 1 10 100 1000

VIN=2.5V

2.7V

6V

5V

4.2V

3.6V

3V

Ta=25oC

2.0%

Output Current: I

OUT

(mA)

1/18

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r

XC9119D10A Series

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PIN CONFIGURATION

PIN ASSIGNMENT

SOT-25 USP-6C

CE PIN FUNCTION

CE/SS PIN OPERATIONAL STATE

PRODUCT CLASSIFICATION

●Ordering Information

XC9119D①②③④⑤‑⑥

DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION

SOT-25

(TOP VIEW)

PIN NUMBER

1 2 Lx Switch
2 3 VSS Ground
3 1 FB Voltage Feedback
4 6 CE/SS Chip Enable/ Soft Start
5 4 VDD Power Input

- 5 NC No Connection

H Operation

L Shut-down

(*1)

PIN NAME FUNCTION

USP-6C

(BOTTOM VIEW)

*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 resistance. If the pad
needs to be connected to other pins, it
should be connected to the V

SS pin.

①② Reference Voltage 10 FB voltage

③ Oscillation Freque ncy A 1MHz

MR SOT-25

④⑤‑⑥

(*1)

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

(*2)

The device orientation is fixed in its embossed tape pocket. For reverse orientation, please contact your local Torex sales office o

representative. (Standard orientation: ④R-⑥, Reverse orientation: ④L-⑥)

Packages

Taping Type

(*2)

MR-G SOT-25 (Halogen & Antimony free)

ER USP-6C

ER-G USP-6C (Halogen & Antimony free)

2/18

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A

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BLOCK DIAGRAM

V

DD

Error Amp.

FB

CE/SS

Vref with

Soft-start,

+

-

CE

BSOLUTE MAXIMUM RATINGS

Phase

Compensation

+

-

Ramp Wave

Generator, OSC

PARAMETER SYMBOL RATINGS UNITS

VDD Pin Voltage VDD VSS – 0.3 ~ 7.0 V

Lx Pin Voltage VLx VSS – 0.3 ~ 22.0 V
FB Pin Voltage VFB VSS – 0.3 ~ 7.0 V
CE Pin Voltage VCE VSS – 0.3 ~ 7.0 V

Lx Pin Current ILx 1000 mA

Power Dissipation

SOT-25 250

USP-6C

Pd

Operating Temperature Range Topr - 40 ~ + 85

Storage Temperature Range Tstg - 55 ~ +125

PWM Comparat or

120

Current

Limit & Feedback

logic

Buffer
Driver

Ta = 25OC

mW

O

C

O

C

XC9119D10A

Series

X

L

V

SS

3/18

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XC9119D10A Series

ELECTRICAL CHARACTERISTICS

XC9119D10AMR

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNIT

FB Voltage VFB - 0.980 1.000 1.020 V ①

Line Regulation

△VFB/

△VIN・VFB

2.5<VDD<6.0V - 0.05 0.20 %/V ①

Supply Voltage VDD - 2.5 - 6.0 V ①

Operation Start-up

Voltage
Supply Current 1 IDD1
Supply Current 2 IDD2

VST1 IOUT=0mA - - 2.5 V ②

FB=2.0V

- 450 700 μA ②

- 55 110 μA ②

Stand-by Current ISTB VCE=0V - - 1.0 μA ③

Oscillation Frequency f

Maximum Duty Ratio MAXDTY Same as IDD1

Efficiency (*1) EFFI

Same as IDD1 0.8 1.0 1.2 MHz ②

OSC

VIN=VDD=3.6V, VOUT=15V,

OUT=10mA

I

86 92 98 % ②

- 86 - % ①

Current Limit ILIM VDD=3.6V 310 400 750 mA ④

Lx Operating Voltage

Range

VLx VOUT=18V - - 20.0 V ①

Lx Switch On Resistance RSWON VDD=3.6V, VLx=0.4V, Rpull=10Ω - 2.0 4.0 Ω ②

Lx Leak Current ILxL Same as ISTB

CE “High” Voltage VCEH

CE “Low” Voltage VCEL

Soft-Start

Threshold Voltage

VSST

Applied voltage to CE when Lx pin

voltage holding “H””L” level

Applied voltage to CE when Lx pin

voltage holding “H” level

FB=0.95V, Appli ed volt age to CE

when Lx voltage holding “H””L” level

- - 1 μA ③

0.65 - - V ②

- - 0.20 V ②

1.3 1.6 1.9 V ②

CE “High” Current ICEH Same as IDD2 -0.1 - 0.1 μA ③

CE “Low” Current ICEL Same as ISTB -0.1 - 0.1 μA ③

FB “High” Current IFBH Same as IDD2 -0.1 - 0.1 μA ③

FB “Low” Current IFBL Same as ISTB -0.1 - 0.1 μA ③

Test Condition: Unless otherwise stated, VIN=3.0V, VCE=3.0V, Vpull=5.0V, Rpull=100Ω.
NOTE:

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

TYPICAL APPLICATION CIRCUIT

V

IN

2.5V~6.0V

(above 2.5V)

Vcont

R

SS

L

V

DD

Lx

SD

RFB1

VOUT

(up to 19.5V)

C

FB

Ta = 25OC

CIRCUI

T

4/18

C

IN

CE/SS FB

V

C

SS

SS

R

FB2

C

L

XC9119D10A

■OPERATIONAL EXPLANATION

The XC9119D10A series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase
compensation circuit, driver transistor, current limiter circuit and others. The series ICs compare, using the error amplifier, the
voltage of the internal reference voltage source with the feedback voltage from the FB pin. 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 switching.
The PWM comparator compares, in terms of volt age level, the signal from the error amplifier with the ramp wave from the ramp
wave circuit, and delivers the resulting output to the buffer drive circuit to cause the Lx pin to output a switching duty cycle.
This process is continuously performed to ensure stable output v oltage. The curr ent feedback circuit detects the N-channel
MOS driver transistor's 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.

<Reference Voltage Source>

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

<Ramp Wave Circuit>

The ramp wave circuit determines switching frequency. The 1MHz (TYP.) of frequency is fixed internally. Clock pulses
generated in this circuit are used to produce ramp waveforms needed for PWM operation.

<Error Amplifier>

The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the FB pin
voltage. Whe n a voltage lower th an the r eference v oltage is fed back, the output voltage of the error amplifier increases.
Gain and frequency characteristics of the error a mpli fier output are fixed in terna lly as an optimize signal .

<Current Limit >

The current limit circuit of the XC9119D10A series monitors the current flowing through the N-channel MOS driver
transistor connected to the Lx pin, and features a combination of the constant-current type current limit mode and the
duty cycle limit of the next pulse.
①When the driver current is greater than a specific level, the constant-current ty pe current limit function operates to turn

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

②The IC controls the next pulse to be smaller than the first pulse.

Series

Current Limit

IL

Lx

1

The current will be off when the coil current
reaches the value of the c onstant current limit.

Current Limit

2

Limit some duty pulses after the limit.

<CE Pin Function>

The operation of the XC9119D10A series will enter into the shut down mode when a low level signal is input to the CE
pin. During the shut down mode, the su pp ly current is 0μA (TYP.), with high impedance at the Lx pin. The IC starts its
operation with 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 hysteresis between the chip enable and the chip disab le is 50mV (TYP.).

<Soft-Start T ime>

Soft-start function operates when capacitors and resistors are connected to the CE/SS pin. With the Vref voltage limited
by the CE/SS pin start-up voltage and applying the input to the error amps, the operation maintains a balance between
the two inputs of the error amps. and controls the Lx pin’s ON time so that it doesn’t increase more than is necessary.
Depending of current limit function, load current, step-up ratio, and external components, the IC takes about 500uS to 5mS
to attain the setting voltage after applying the CE ‘H’ voltage even though the R
connected. (F or a numer ical co nstant, pl ease refe r to Note on Use.) For longer soft-start time, please connect R

SS is 0Ω and a soft start capacitor CSS is not

SS and CSS.

Soft-start function operates while the CE pin voltage is between 0V to around 1.9V. Please be noted that if th e C E/SS pin volt age
does not start from 0V but is in intermediate potential when the power is turned on etc., soft start function may lose an effect and
that will cause a high inrush current and ripple voltage.

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XC9119D10A Series

OPERATIONAL EXPLANATION (Continued)

<CE/SS (Pin No. 4): Chip Enable / Soft-Start Pin>

Pin No. 4 can be used as in either chip enable (CE) pin or sof t-start (SS) pin. The IC takes about 5ms at most to attain the setting
voltage after starting operation (CE ‘H’) even though the R
Soft-start function is good for setting a longer time than the start-up time when the R
Soft-start operates while the CE pin voltage increases from 0V to around 1.9V. The following equation is used with the values of
Vcont voltage, the R

SS x RSS x In {(Vcont – 1.6) / Vcont}

T = - C

●Start-up waveform
when the R

Ex.) When CSS=0.1uF, RSS=220kΩ, Vcont=5V,

T= - 0.1e – 6 x 220e3 x In{(5-1.6)/5} = 8.48ms

Ex.) Reference Circuit 1: N-ch Open Drain

SS and the CSS.

SS is 0Ω and the CSS is not connected

SS is 0Ω and the CSS is not connected.

SS is 0Ω and the CSS is not connected.

RSS=0Ω, No CSS, VIN=3.6V, V

0V (1ch) ⇒

0V (2ch) ⇒

Time:500uS/div.

1ch:5V/div., 2ch:2V/div.

C

CE/SS Pin

CE Vref

SS

Vcont

R

Vcont

SS

OUT

1ch: V

2ch: CE

=15V, I

OUT

OUT

=3mA

Error Amp.

ON/OFF

Signal

Ex.) Reference Circuit 2: CMOS Logic (Low Supply Current)

ON/OFF

Signal

Ex.) Reference Circuit 3: CMOS Logic (Low Supply Current), Quick-Off

ON/OFF

Signal

Vcont

R

SS

C

R

SS

C

SS

Vcont

R

SS

C

SS

CE/SS Pin

SS

CE/SS Pin

CE/SS Pin

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