Datasheet XC9101 Datasheet (TOREX)

XC9101 Series

ETR0403_004a

PWM Controlled Step-Up DC/DC Controller

■GENERAL DESCRIPTION

The XC9101 series are step-up multiple current and voltage feedback DC/DC controller ICs. Current sense, clock
frequencies and amp feedback gain can all be externally regulated.
A stable power supply is possible with output currents of up to 1.5A.
With output voltage fixed internally, V
For output voltages outside this range, we recommend the FB version, which has a 0.9V internal reference voltage. Using this
version, the required output voltage can be set using 2 external resistors.
Switching frequency can also be set externally within a range of 100 ~ 600 kHz and therefore a frequency suited to your
particular application can be selected.
With the current sense function, peak currents (which flow through the driver transistor and the coil) can be controlled.
Soft-start time can be adjusted using external resistor and capacitor.
During shutdown (CE pin=L), consumption current can be reduced to as little as 0.5μA (TYP.) or less.

■APPLICATIONS

●Mobile, Cordless phones

●Palm top computers, PDAs

●Portable games

●Cameras, Digital cameras

●Note book PCs11

■TYPICAL APPLICATION CIRCUIT

OUT is selectable in 0.1V increments within a 2.5V ~ 16.0V range (±2.5%).

■FEATURES

Stable Operations via Current & Voltage
Multiple Feedback
Unlimited Options for Peripheral Selection
Current Protection Circuit
Ceramic Capacitor Compatible
Input Voltage Range : 2.5V ~ 20V
Output Voltage Range : 2.5V ~ 16V

(Fixed Voltage Type)

: 30V + (Adjustable Type)

Oscillation Frequency Range

: 100 kHz ~ 600kHz

Output Current : Up to 1.5A
Operating Ambient Temperature
Packages : MSOP-8A, SOP-8

:-40℃～＋85℃

■TYPICAL PERFORMANCE

CHARACTERISTICS

VOUT=5.0V, f

=180 kHz

OSC

1/22

XC9101 Series

■PIN CONFIGURATION

■PIN ASSIGNMENT

PIN NUMBER

MSOP-8A SOP-8

1 1 EXT Driver
2 2 Isen Current Sense
3 3 VIN Power Input
4 4 CE/SS CE/Soft Start
5 5 CLK Clock Input
6 6 CC/GAIN Phase Compensation
7 7 VOUT/FB Voltage Sense
8 8 VSS Ground

■PRODUCT CLASSIFICATION

●Ordering Information

XC9101①②③④⑤⑥-⑦

MSOP-8A

(TOP VIEW)

(*1)

PIN NAME FUNCTION

SOP-8

(TOP VIEW)

DESIGNATOR ITEM SYMBOL DESCRIPTION

①

Type of DC/DC Controllers

C VOUT (Fixed voltage type), Soft-start externally set-up

D FB (Voltage adjustable), Soft-start externally set-up

e.g. VOUT=2.5V→②=2, ③=5
FB products→②=0, ③=9 fixed

25 ~ H0

Voltages above 10V

→10=A, 11=B, 12=C, 13=D, 14=E, 15=F, 16=H

② ③

④

Output Voltage

09

e.g. V

OUT=13.5V → ②=D, ③=5

FB products→②=0, ③=9 fixed

Oscillation Frequency A Frequency adjustable

KR MSOP-8A (1,000/Reel)

⑤⑥-⑦

Packages (Order Unit)

KR-G MSOP-8A (1,000/Reel)

SR SOP-8 (1,000/Reel)

(*1)

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

The standard output voltages of the XC9101C series are 2.5V, 3.3V, and 5.0V.

Voltages other than those listed are semi-custom.

2/22

■BLOCK DIAGRAM

■ABSOLUTE MAXIMUM RATINGS

PAR AMETER SYMBOL RATINGS UNITS
EXT Pin Voltage VEXT
Isen Pin Voltage VIsen

VIN Pin Voltage VIN

CE/SS Pin Voltage VCE

CLK Pin Voltage VCLK

CC/GAIN Pin Voltage VCC

VOUT/FB Pin Voltage VOUT/FB

EXT Pin Current IEXT

Power Dissipation

MSOP-8A 150

SOP-8

Pd

Operating Ambient Temperature Topr

Storage Temperature Tstg

-0.3～V

IN＋0.3

-0.3～＋22

-0.3～＋22

-0.3～＋22

-0.3～V

-0.3～V

IN＋0.3
IN＋0.3

-0.3～＋22
±100

300

-40～＋85 ℃

-55～＋125 ℃

Ta = 2 5 ℃

V
V
V
V
V
V
V

mA

mW

XC9101

Series

3/22

XC9101 Series

■ELECTRICAL CHARACTERISTICS

XC9101C33AKR

PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUITS

Output Voltage VOUT IOUT=300mA 3.218 3.300 3.382 V

Maximum

Operating Voltage

Minimum

Operating Voltage

Supply Current 1 IDD1

Supply Current 2 IDD2

Stand-by Current I

CLK

Oscillation Frequency

Frequency

Line Regulation

Frequency

Temperature Fluctuation

Maximum Duty Cycle D

Minimum Duty Cycle D

Current Limit Voltage ILIM

ISEN Current IISEN VIN=2.5V, ISEN=2.5V 4.5 7 13

VINmax 20

VINmin

VIN=2.5V, VOUT=CE=
Setting Output Voltage×0.95V

VIN=2.5V, CE=VIN

OUT=Setting Output Voltage×1.05V

V

VIN=2.5V, CE=VOUT=VSS 0.5 2.0

STB

f

RT=10.0kΩ, CT=220pF 280 330 380 kHz

OSC

Δf

ΔVIN･f

Δf

ΔTopr･f

OSC

OSC

MAX

MIN

VIN=2.5V ~ 20V

OSC

VIN=2.5V
Topr=-40 ~ +85℃

OSC

VOUT=Set Voltage×0.95V 79 85 89 %

VOUT=Set Voltage×1.05V

IN pin voltage－ISEN pin voltage

V

－ －

－

－

－ ±5 －

－ ±5 －

－ －

90 150 220 mV

－ －

2.5 V

150 255

90 176

0 %

V

μA ②

μA ②

μA ②

%

%

μA ⑥

Ta =2 5℃

①

①

①

③

③

③

④

④

⑥

CE "High" Current ICEH CE=VIN=2.5V, VOUT=0V -0.1 0 0.1

CE "Low" Current ICEL CE=0V, VIN=2.5V, VOUT=0V -0.1 0 0.1

CE "High" Voltage VCEH

CE "Low" Voltage VCEL

EXT "High" ON

Resistance

EXT "Low" ON

Resistance
Efficiency

(*1)

EFFI

R

R

EXTH

EXTL

Soft-Start Time tSS

CC/GAIN Pin

Output Impedance

Unless otherwise stated, VIN = 2.5V

NOTE:
*1: EFFI = {[(output voltage) × (output current)] ÷ [(input voltage) × (input current)]} × 100

*2: The capacity range of the capacitor used to set the external CLK frequency is 150 ~ 220pF

RCCGAIN

CLK Oscillation Starts,
V

OUT=0V, CE: Voltage applied

CLK Oscillation Stops,
V

OUT=0V, CE: Voltage applied

IN－0.4V, CE=VIN=2.5V

EXT=V

OUT=Setting voltage×0.95V

V
EXT=0.4V, CE=V
V

OUT=Setting voltage×1.05

IN=2.5V

Connect CSS and RSS,
CE : 0V→2.5V

0.6

－ －

－

－

－

－ －

0.2 V

31 58

27 45

88

－

5 10 20 ms

－

400

－ kΩ ⑦

μA ⑤

μA ⑤

V

Ω ④

Ω ④

%

⑤

⑤

①

①

4/22

XC9101

Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9101C50AKR

PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUITS

Output Voltage VOUT IOUT=300mA 4.875 5.000 5.125 V

Maximum

Operating Voltage

Minimum

Operating Voltage

Supply Current 1 IDD1

Supply Current 2 IDD2

Stand-by Current I

CLK

Oscillation Frequency

Frequency

Line Regulation

Frequency

Temperature Fluctuation

Maximum Duty Cycle D

Minimum Duty Cycle D
Current Limit Voltage ILIM

ISEN Current IISEN VIN=3.0V, ISEN=3.0V 4.5 7 13
CE "High" Current ICEH CE=VIN=3.0V, VOUT=0V -0.1 0 0.1
CE "Low" Current ICEL CE=0V, VIN=3.0V, VOUT=0V -0.1 0 0.1

CE "High" Voltage VCEH

CE "Low" Voltage VCEL

EXT "High"

ON Resistance

EXT "Low"

ON Resistance

Efficiency

(*1)

EFFI

Soft-Start Time tSS

CC/GAIN Pin

Output Impedance

NOTE: Unless otherwise stated, VIN = 3.0V.

*1: EFFI = {[(output voltage) × (output current)] ÷ [(input voltage) × (input current)]} × 100

*2: The capacity range of the capacitor used to set the external CLK frequency is 150 ~ 220pF

VINMAX 20

VINMIN

VIN=3.0V, VOUT=CE=
Setting Output Voltage×0.95V

IN=3.0V, CE=VIN

V
V

OUT=Setting Output Voltage×1.05V

VIN=3.0V, CE=VOUT=VSS

STB

f

RT=10.0kΩ, CT=220pF 280 330 380 kHz

OSC

Δf

ΔVIN･f

Δf

ΔTopr･f

OSC

OSC

OSC

OSC

VOUT=Setting Voltage×0.95V 79 85 89 %

MAX

VOUT=Setting Voltage×1.05V

MIN

IN=2.5V～20V － ±5 －

V

VIN=2.5V
Topr=-40～+85℃

IN pin voltage－ISEN pin voltage

V

CLK Oscillation Starts,
V

OUT=0V, CE: Voltage applied

CLK Oscillation Stops,
V

OUT=0V, CE: Voltage applied

IN－0.4V, CE=VIN=3.0V

REXTH

REXTL

EXT=V
V

OUT=Setting voltage×0.95V

EXT=0.4V, CE=VIN=3.0V
V

OUT=Setting voltage×1.05V

－ －

－

－

－

－ ±5 －

－ －

90 150 220 mV

0.6

－ －

－

－

－

CCGAIN

R

Connect C
CE: 0V→3.0V

SS and RSS,

－

－

－ －

160 270

90 176

0.5 2.0

－ －

27 51

25 37

87

5

400

V

2.5 V

μA ②

μA ②

μA ②

%

%

0 %

μA ⑥
μA ⑤
μA ⑤

V

0.2 V

Ω ④

Ω ④

－

－

%

ms

－ kΩ ⑦

Ta =2 5℃

①

①

①

③

③

③

④
④
⑥

⑤

⑤

①

①

5/22

XC9101 Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9101D09AKR

PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUITS

Output Voltage VOUT IOUT=300mA 0.8775 0.9 0.9225 V

Maximum

Operating Voltage

Minimum

Operating Voltage

Supply Current 1 IDD1 VIN=2.5V, VIN=CE, FB=0.9×0.95V

Supply Current 2 IDD2

Stand-by Current I

CLK

Oscillation Frequency

Frequency

Line Regulation

Frequency

Temperature Fluctuation

Maximum Duty Cycle D

Minimum Duty Cycle D

Current Limiter Voltage ILIM

ISEN Current IISEN VIN=2.5V, ISEN=2.5V 4.5 7 13

CE "High" Current ICEH CE=VIN=2.5V, FB=0V -0.1 0 0.1

CE "Low" Current ICEL CE=0V, VIN=2.5V, FB=0V -0.1 0 0.1

CE "High" Voltage VCEH

CE "Low" Voltage VCEL

EXT "High"

ON Resistance

EXT "Low"

ON Resistance

Efficiency

(*1)

EFFI

Soft-Start Time tSS

CC/GAIN Pin

Output Impedance

NOTE: Unless otherwise stated, VIN = 2.5V

External Components: R

*1: EFFI = {[(output voltage) × (output current)] ÷ [(input voltage) × (input current)]} × 100

*2: The capacity range of the capacitor used to set the external CLK frequency is 150 ~ 220pF.

VINMAX 20

VINMIN

－ －

－

VIN=2.5V, CE=VIN,
V

OUT=0.9×1.05V

VIN=2.5V, CE=FB=VSS

STB

RT=10.0kΩ, CT=220pF 280 330 380 kHz

f

OSC

Δf

ΔV

Δf

ΔTopr･f

OSC

IN･f

OSC

MAX

MIN

V

IN=2.5V～20V － ±5 －

OSC

VIN=2.5V
Topr=-40～+85℃

OSC

VOUT=0.9×0.95V 79 85 89 %

VOUT=0.9×1.05V 0 %

IN pin voltage－ISEN pin voltage

V

－

－

－ ±5 －

90 150 220 mV

－ －

2.5 V

150 255

90 176

0.5 2.0

μA ②

μA ②

μA ②

μA ⑥
μA ⑤
μA ⑤

CLK Oscillation Start,
FB=0V, CE: Voltage applied
CLK Oscillation Stop,
FB=0V, CE: Voltage applied

IN－0.4V, CE=VIN

REXTH

R

EXTL

EXT=V

OUT=Setting voltage×0.95V

V
EXT=0.4V, CE=V
V

OUT=Setting voltage×1.05V

Connect C

IN

SS and RSS,

CE : 0V→2.5V

CCGAIN

R

FB1=200kΩ, RFB2=100kΩ, CFB=82pF

0.6

－ －

－

－

－

－ －

0.2 V

31 58

27 45

88

－

5 10 20 ms

－

400

－ kΩ ⑦

Ta =2 5℃

①

V

①

①

③

%

%

③

③

④
④
⑥

V

⑤

⑤

Ω ④

Ω ④

%

①

①

6/22

XC9101

■TYPICAL APPLICATION CIRCUITS

XC9101C33AKR

NMOS : XP161A1355PR
Coil : 22μH (CR105 SUMIDA)
Resistor : 20mΩ for I
Capacitors : 180pF (ceramic) for CLK, 470pF (ceramic) for CC/GAIN, 0.1μF (ceramic) for SS,1μF (ceramic) for Bypass

SD : U3FWJ44N (TOSHIBA)

XC9101C50AKR

NMOS : XP161A1355PR
Coil : 22μH (CR105 SUMIDA)
Resistor : 20mΩ for ISEN (NPR1 KOA), 33kΩ(trimmer) for CLK, 100kΩ for SS
Capacitors : 180pF (ceramic) for CLK, 470pF (ceramic) for CC/GAIN, 0.1μF (ceramic) for SS,1μF (ceramic) for Bypass

SD : U3FWJ44N (TOSHIBA)

47μF (OS)+220μF (any) for CL, 220μF (any) for C

47μF (OS)+220μF (any) for CL, 220μF(any) for C

SEN (NPR1 KOA), 33kΩ(trimmer) for CLK, 100kΩ for SS

IN

IN

Series

7/22

XC9101 Series

■TYPICAL APPLICATION CIRCUITS (Continued)

XC9101D09AKR

NMOS : XP161A11A1PR
Coil : 22μH (CDRH127 SUMIDA)
Resistor : 10mΩ for I
Capacitors : 180pF (ceramic) for CLK, 470pF (ceramic) for CC/GAIN, 0.1μF (ceramic) for SS, 1μF (ceramic) for Bypass

SD : U5FWJ44N (TOSHIBA)
V

OUT : 16V

RFB1 : 560kΩ
R

FB2 : 33kΩ
FB : 27pF

C

V

OUT : 20V

RFB1 : 470kΩ
R

FB2 : 22kΩ
FB : 33pF

C

47μF (OS)+220μF (any) for CL, 220μF (any) for C

SEN (NPR1 KOA), 33kΩ(trimmer) for CLK, 150kΩ for SS

IN

8/22

XC9101

■OPERATIONAL EXPLANATION

Step-up DC/DC converter controllers of the XC9101 series carry out pulse width modulation (PWM) according to the
multiple feedback signals of the output voltage and coil current. The internal circuits consist of different blocks that
operate at VIN or the stabilized power (2.0 V) of the internal regulator. The fixed output voltage of the C type and the FB
pin voltage (Vref = 0.9 V) of type D controller have been adjusted and set by laser-trimming.

<Clock>
With regard to clock pulses, a capacitor and resistor connected to the CLK pin generate ramp waveforms whose top and
bottom are 0.7V and 0.15V, respectively. The frequency can be set within a range of 100kHz to 600kHz externally (refer to
the "Functional Settings" section for further information). The clock pulses are processed to generate a signal used for
synchronizing internal sequence circuits.

<Verr amplifier>
The Verr amplifier is designed to monitor the output voltage. A fraction of the voltage applied to internal resistors R1, R2 in
the case of a type C controller, and the voltage at the FB pin in the case of a type D controller, are fed back and compared
with the reference voltage. In response to feedback of a voltage lower than the reference voltage, the output voltage of
the Verr amplifier increases. The output of the Verr amplifier enters the mixer via resistor (R
pulse width control signal during PWM operations. By connecting an external capacitor and resistor through the CE/GAIN
pin, it is possible to set the gain and frequency characteristics of Verr amplifier signals (refer to the "Functional Settings"
section for further information).

<Ierr amplifier>
The Ierr amplifier monitors the coil current. The potential difference between the V
switching operation. Then the potential difference is amplified or held, as necessary, and input to the mixer. The Ierr
amplifier outputs a signal ensuring that the greater the potential difference between the VIN and ISEN pins, the smaller the
switching current. The gain and frequency characteristics of this amplifier are fixed internally.

<Mixer and PWM>
The mixer modulates the signal sent from Verr by the signal from Ierr. The modulated signal enters the PWM comparator
for comparison with the sawtooth pulses generated at the CLK pin. If the signal is greater than the sawtooth waveforms, a
signal is sent to the output circuit to turn on the external switch.

<Current Limiter>
The current flowing through the coil is monitored by the limiter comparator via the V
comparator outputs a signal when the potential difference between the V
This signal is converted to a logic signal and handled as a DFF reset signal for the internal limiter circuit. When a reset
signal is input, a signal is output immediately at the EXT pin to turn off the MOS switch. When the limiter comparator
sends a signal to enable data acceptance, a signal to turn on the MOS switch is output at the next clock pulse. If at this
time the potential difference between the V
DFF operates in synchronization with the clock signal of the CLK pin.

<Soft Start>
The soft start function is made available by attaching a capacitor and resistor to the CE/SS pin. The Vref voltage applied to
the Verr amplifier is restricted by the start-up voltage of the CE/SS pin. This ensures that the Verr amplifier operates with its
two inputs in balance, thereby preventing the ON-TIME signal from becoming stronger than necessary. Consequently, soft
start time needs to be set sufficiently longer than the time set to CLK. The start-up time of the CE/SS pin equals the time set
for soft start (refer to the "Functional Settings" section for further information). The soft start function operates when the
voltage at the CE/SS pin is between 0V to 1.55V. If the voltage at the CE/SS pin doesn't start from 0V but from a mid level
voltage when the power is switched on, the soft start function become ineffective and large in-rush currents and ripple voltages
may happen to create.

PWM/PFM switching signal

CLK synchronous signal

IN and ISEN pins is large, operation is repeated to turn off the MOS switch again.

Limiter signal

/RESET

D

CLK

Q

IN and ISEN pins reaches about 150 mV or more.

Output signal to EXT pin

PWM/PFM switching signal

Verr). This signal works as a

IN and Isen pins is sampled at each

IN and ISEN pins. The limiter

Series

9/22

)

XC9101 Series

■OPERATIONAL EXPLANATION (Continued

●Functional Settings

1. Soft Start
CE and soft start (SS) functions are commonly assigned to the CE/SS pin. The soft start function is effective until the
voltage at the CE pin reaches approximately 1.55 V rising from 0 V. Soft start time is approximated by the equation below
according to values of Vcont, RSS, and CSS

Example: When C

T = -0.1 x 10

Set the soft start time to a value sufficiently longer than the period of a clock pulse.

> Circuit example 1: N-ch open drain

> Circuit example 2: CMOS logic (low supply current)

T = - CSS × RSS × ln ((Vcont - 1.55) / Vcont)

-6

× 470 x 103 × ln ((5 - 1.55) / 5) = 17.44 ms.

.

SS = 0.1 μF, R SS = 470 kΩ, and Vcont = 5 V,

CE/SS pin

Rss

Vcont Css

ON/OFF signal

Vcont

ON/OFF signal

Css

Rss

CE,
UVLO

Vcont

Rss

Css

Vref

circuit

CE/SS pin

CE/SS pin

To Verr amplifier

> Circuit example 3: CMOS logic (low supply current), quick off

Vcont

Rss

ON/OFF signal

10/22

CE/SS pin

Css

XC9101

■OPERATIONAL EXPLANATION (Continued)

●Functional Settings (Continued)

2. Oscillation Frequency
The oscillation frequency of the internal clock generator is approximated by the following equation according to the values
of the capacitor and resistor attached to the CLK pin. To stabilize the IC's operation, set the oscillation frequency within a
range of 100kHz to 600kHz. Select a value for Cclk within a range of 150pF to 220pF and fix the frequency based on the
value for Rclk.

×

Example: When Cclk = 220 pF and Rclk = 10 kΩ, f = 1 / (-220 x 10

3. Gain and Frequency Characteristics of the Verr Amplifier
The gain at output and frequency characteristics of the Verr amplifier are adjusted by the values of the capacitor and
resistor attached to the CC/GAIN pin. It is generally recommended to attach a CC of 220 to 1,000pF without R
greater the CC value, the more stable the phase and the slower the transient response. When using the IC with RGAIN
connected, it should be noted that if the RGAIN resistance value is too high, abnormal oscillation may occur during transient
response time. The size of R

4. Current Limit
The current limit value is approximated by the following equation according to resistor R

SEN pins. Double function, current FB input and current limiting, is assigned to the ISEN pin. The current limiting value is

I
approximated by the following equation according to the value for R

Example: When RSEN = 100 mΩ, I

The inside error amplifier sends feedback signal when the voltage occurs at R
current in order to phase compensate. The more the R
bigger, and it could lead to an intermittent oscillation. Please be careful if there is a problem with the application. Under
the regular operation, a voltage created by a peak coil current at the R
voltage 90 mV (MIN). For more details, please refer the notes on the external components.

f = 1/(-Cclk

I

Lpeak_limit

Rclk × ln0.26)

Rclk

GAIN should be carefully evaluated before connection.

CC

= 0.15/R

SEN

Rsen

CLK pin

CC/GAIN pin

RGAIN

Lpeak_limit

Isen pin

Cclk

RVerr

= 0.15/0.1 = 1.5 A

IN

pin

V

Comparator with
150ｍV offset

-12

×

CLK Generator

Verr

SEN value becomes larger, the more the error signal becomes

V

Vref

SEN.

SEN

3

10 x 10

OUT

×

ln(0.26)) = 337.43 kHz.

/FB

SEN inserted between the VIN and

Limiter signal

SEN resistor because of the flow of coil

GAIN. The

resistor should be set lower than the current limit

Series

11/22

XC9101 Series

■OPERATIONAL EXPLANATION (Continued)

●Functional Settings (Continued)

5. FB Voltage and C
With regard to the XC9101D series, the output voltage is set by attaching externally divided resistors. The output voltage
is determined by the equation shown below according to the values of R

FB2 should be 1 MΩ or less.

R

The value of C

FB1 and fzfb. The value of fzfb should be 10 kHz, as a general rule.

R

Example: When R

■NOTES ON USE

●Application Notes

1. The XC9101 series are designed for use with an output ceramic capacitor. If, however, the potential difference
between input and output is too large, a ceramic capacitor may fail to absorb the resulting high switching energy and
oscillation could occur on the output side. If the input-output potential difference is large, connect an electrolytic
capacitor in parallel to compensate for insufficient capacitance.

2. The EXT pin of the XC9101 series is designed to minimize the through current that occurs in the internal circuitry.
However, the gate drive of external NMOS has a low impedance for the sake of speed. Therefore, if the input voltage is
high and the bypass capacitor is attached away from the IC, the charge/discharge current to the external NMOS may
lead to unstable operations due to switching operation of the EXT pin.

As a solution to this problem, place the bypass capacitor as close to the IC as possible, so that voltage variations at the
V
of ohms between the EXT pin and NMOS gate. Remember that the insertion of a resistor slows down the switching
speed and may result in reduced efficiency.

3. A NPN transistor can be used in place of NMOS. If using a NPN transistor, insert a resistor (R
between the EXT pin and the base of the NPN transistor in order to limit the base current without slowing the switching
speed. Adjust R
capacitor for C

4. Although the C_CLK connection capacitance range is from 150 ~ 220pF, the most suitable value for maximum stability is
around 180pF.

OUT = 0.9

V

C

FB = 1/(2

FB = 1/(2

: C

IN and VSS pins caused by switching are minimized. If this is not effective, insert a resistor of several to several tens

FB

FB1 and RFB2. In general, the sum of RFB1 and

×

(RFB1 + RFB2)/ RFB2

FB (phase compensation capacitor) is approximated by the following equation according to the values of

× π ×

FB1 = 455 kΩ and RFB2 = 100 kΩ : VOUT = 0.9

× π ×

Output voltage

B in a range of 500Ω to 1 kΩ according to the load and h

B, complying with CB < 1/(2

RFB1 × fzfb)

455 k × 10 k) = 34.98 pF

Cfb

Rfb1

Rfb2

×π×

EXT pin

Rb

Cb

FB pin

RB ×F

×

0.9V

×

0.7), as a rule.

OSC

V

IN

(455 k ＋ 100 k)/100 k = 4.995 V

Verr

Verr amplifier

B) and capacitor (CB)

of the transistor. Use a ceramic

FE

12/22

)

XC9101

■NOTES ON USE (Continued

●Instruction on Pattern Layout

① In order to stabilize VDD voltage level, we recommend that a by-pass capacitor (CDD) be connected as close as

possible to the VIN & VSS pins.

② In order to stabilize the GND voltage level which can fluctuate as a result of switching, we suggest that C_CLK, R_CLK

and C_GAIN GND is separated from Power GND and connected as close as possible to the V
capacitor, C

< XC9101D Series Pattern Layout Examples>

2 Layer Better Evaluation Board

RSEN

VIN

DD). Please use a multi layer board and check the wiring carefully.

CIN

L

N-MOS

1

2

3

R_SS

4 5

C_SS

SD

CDD

8

7

6

R_CLK

C_CLK

RFB1

C_GAIN

CFB

RFB2

Through Hole

1

2

3

4

8

7

6

5

R_CLK,C_CLK,C_GAIN,RFB2

GND

Through Hole

CL

VDD line

IC GND

Power GND

SS pin (by-pass

Series

13/22

)

XC9101 Series

■NOTES ON USE (Continued

●Instruction on Pattern Layout (Continued)

1 Layer Good Evaluation Board

●Notes

1. Ensure that the absolute maximum ratings of the external components and the XC9101 DC/DC IC itself are not exceeded.

2. We recommend that sufficient counter measures are put in place to eliminate the heat that may be generated by the external

3. Try to use a N-channel MOSFET with a small gate capacitance in order to avoid overly large output spike voltages that may

4. The performance of the XC9101 DC/DC converter is greatly influenced by not only its own characteristics, but also by those of

5. Wire external components as close to the IC as possible and use thick, short connecting wires to reduce wiring impedance.

6. Make sure that the GND wiring is as strong as possible as variations in ground potential caused by ground current at the time

RSEN

VIN

N-channel MOSFET as a result of switching losses.

occur (such spikes occur in proportion to gate capacitance).

the external components it is used with. We recommend that you refer to the specifications of each component to be used and

take sufficient care when selecting components.

In particular, minimize the distance between the by-pass capacitor and the IC.

of switching may result in unstable operation of the IC. Specifically, strengthen the ground wiring in the proximity of the V

pin.

CIN

L

N-MOS

1

2

3

R_SS

4

C_SS

SD

CDD

8

7

6

5

R_CLK

C_CLK

C_GAIN

RFB1

RFB2

CFB

CL

VDD line

IC GND

Power GND

SS

14/22

■TEST CIRCUITS

・Circuit ① (V

22μH

100mΩ

220μF

NMOS

R_SS

0.1μF

OUT Type)

1 EXT

2 Isen

3 V

4 CE/SS

1μF

SD

Vss 8

OUT

7

V

GAIN 6

IN

CLK 5

10KΩ

XC9101C33A R_SS：104kΩ C-SS：0.1μF
XC9101C50A R_SS：138kΩ C-SS：0.1μF

・Circuit ②

Vss 8

A

0.1μF

1 EXT

2 Isen

IN

3 V

4 CE/SS

OUT

V

/FB 7

GAIN 6

CLK 5

10KΩ

・Circuit ④

1 EXT

OSC

0.1μF

2 Isen

3 V

IN

4 CE/SS

V

OUT

GAIN 6

CLK 5

Vss 8

/FB 7

・Circuit ⑥

A

V

0.1μF

1 EXT

2 Isen

IN

3 V

4 CE/SS

V

OUT

GAIN 6

220pF

10KΩ

Vss 8

/FB 7

CLK 5

220pF

10KΩ

470pF

220pF

20μF

220pF

XC9101

Series

・Circuit ① (FB Type)

SD22μH

NMOS

1 EXT

Vss 8

2 Isen

100mΩ

220μF

R_SS

0.1μF

1μF

RL

V

IN

3 V

4 CE/SS

FB 7

GAIN 6

CLK 5

10KΩ

・Circuit ③

Vss 8

1 EXT

V

OUT

/FB 7

2 Isen

GAIN 6

IN

3 V

CLK 5

4 CE/SS

0.1μF

10KΩ

・Circuit ⑤

1 EXT

V

0.1μF

2 Isen

3 V

IN

4 CE/SS

A

・Circuit ⑦

1 EXT

Vss 8

V

OUT

/FB 7

2 Isen

GAIN 6

3 V

IN

CLK 5

4 CE/SS

0.1μF

V

OUT

GAIN 6

CLK 5

Vss 8

/FB 7

CFB

220pF

220pF

10KΩ

RFB2

470pF

1MΩ

RFB1

OSC

220pF

RL

V

20μF

V

V

15/22

XC9101 Series

■TYPICAL PERFORMANCE CHARACTERISTICS

XC9101D09AKR

(1) Output Voltage vs. Output Current

16/22

■TYPICAL PERFORMANCE CHARACTERISTICS(Continued)

XC9101D09AKR

(2) Efficiency vs. Output Current

V

V

XC9101

Series

17/22

XC9101 Series

■TYPICAL PERFORMANCE CHARACTERISTICS(Continued)

XC9101D09AKR

(3) Ripple Voltage vs. Output Current

Note : If the difference between the input and output voltage is large or small, switching ON/OFF time will be

18/22

shortened. As such, the external components used and their values (inductance value of the coil, resistor
connected to CLK, capacitor etc.) may have a critical influence on the actual operation of the IC.

■PACKAGING INFORMATION

●MSOP-8A

XC9101

Series

●SOP-8

19/22

XC9101 Series

■ MARKING RULE

● MSOP-8A

MSOP-8A
(TOP VIEW)

①Represents product series

MARK PRODUCT SERIES

4 XC9101xxxAKx

②Represents type of DC/DC controller

MARK TYPE PRODUCT SERIES

C VOUT, CE PIN XC9101CxxAKx
D FB, CE PIN XC9101D09AKx

③Represents integral number of output voltage, or FB type

MARK VOLTAGE (V) PRODUCT SERIES

2 2.x XC9101C2xAKx
3 3.x XC9101C3xAKx
4 4.x XC9101C4xAKx
5 5.x XC9101C5xAKx
6 6.x XC9101C6xAKx
7 7.x XC9101C7xAKx
8 8.x XC9101C8xAKx
9 9.x XC9101C9xAKx
0 FB products XC9101D09AKx
A 10.x XC9101CAxAKx

B 11.x XC9101CBxAKx
C 12.x XC9101CCxAKx
D 13.x XC9101CDxAKx
E 14.x XC9101CExAKx
F 15.x XC9101CFxAKx
H 16.x XC9101CHxAKx

④Represents decimal number of output voltage, FB products (ex.)

MARK VOLTAGE (V) PRODUCT SERIES

0 x.0 XC9101Cx0AKx
3 x.3 XC9101C3xAKx
9 FB products XC9101D09AKx

⑤Represents control type of oscillation frequency

MARK TYPE PRODUCT SERIES

A Adjustable Frequency XC9101xxxAKx

⑥Represents production lot number
0 to 9, A to Z repeated (G, I, J, O, Q, W excepted).
Note: No character inversion used.

20/22

■ MARKING RULE (Continued)

●SOP-8

①②Represents product series

① ②

0 1 XC9101xxxASx

③Represents type of DC/DC controller

MARK TYPE PRODUCT SERIES

C VOUT, CE pin XC9101CxxAKx
D FB, CE pin XC9101D09AKx

SOP-8

(TOP VIEW)

④Represents integral number of output voltage, or FB type

MARK

VOLTAGE

2 2.x XC9101C2xAKx A 10.x XC9101CAxAKx
3 3.x XC9101C3xAKx B 11.x XC9101CBxAKx
4 4.x XC9101C4xAKx C 12.x XC9101CCxAKx
5 5.x XC9101C5xAKx D 13.x XC9101CDxAKx
6 6.x XC9101C6xAKx E 14.x XC9101CExAKx
7 7.x XC9101C7xAKx F 15.x XC9101CFxAKx
8 8.x XC9101C8xAKx H 16.x XC9101CHxAKx
9 9.x XC9101C9xAKx
0 FB products XC9101C09AKx

⑤Represents decimal number of output voltage, FB type (ex.)

MARK VOLTAGE (V) PRODUCT SERIES

0 x.0 XC9101Cx0AKx
3 x.3 XC9101C3xAKx
9 FB products XC9101D09AKx

⑥Represents control type of oscillation frequency

MARK TYPE PRODUCT SERIES

A Variable by external C and R XC9101xxxAKx

⑦Represents the last digit of production year

⑧⑨Represents production lot number (ex.)

0 to 9, A to Z repeated (G, I, J, O, Q, W excluded).
Note: No character inversion used.

⑧ ⑨

0 3 03

0 A 1A

XC9101

Series

MARK PRODUCT SERIES

(V)

PRODUCT

SERIES

MARK

MARK YEAR

0 2000
6 2006

MARK

VOLTAGE

(V)

PRODUCTION LOT NUMBER

PRODUCT

SERIES

21/22

XC9101 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 catalog 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 catalog.

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

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

4. The products in this catalog 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 catalog 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.

7. All rights reserved. No part of this catalog may be copied or reproduced without the

prior permission of Torex Semiconductor Ltd.

22/22