XC9120/XC9121/XC9122
Series
Step-Up DC/DC Controller IC, MAXDUTY: 93%
ETR0409 002
☆GO-Compatible
■GENERAL
DESCRIPTION
XC9120/9121/9122 Series are PWM, PWM/PFM auto/external switching controlled step-up DC/DC converter controller ICs.
Since maximum duty ratio is as large as 93%, the series is the best for the applications used as high step-up ratios, such as
the LCD panels and OLED. In this series, even if it is a high step-up ratio, the output voltage stabilized at high efficiency can
be obtained. With 0.9V (±2.0%) of reference voltage supply internal, and using external resistors, RFB1 and 2, output
voltage can be set up freely within a range of 1.5V to 30V. For a current sense, with the use of RSENSE, ceramic capacitors
can be used as load capacitors and allows for lower output ripple and reduced PCB area requirements.
Control automatically switches from PWM to PFM during light loads with the XC9121 series and the XC9122 series can
switch the control from PWM to PFM using external signals depending on the circuit conditions..
During stand-by (when the CE pin is low), all circuits are shutdown to reduce current consumption to as low as 1.0μA or less.
The overcurrent limit circuit of this IC is designed to monitor the ripple voltage of the FB pin and operates the IC to stop when
the ripple voltage runs over 250mV. The IC resumes its operation with a toggle of the CE pin or by turning the power supply
back on.
■APPLICATIONS
●Power
Supply for the LCDs.
●High
Step-Up Ratio Equipment (OLED, etc.)
Input Voltage Range
: 0.9V~6.0V
Operating Voltage Range
: 1.8V~6.0V
Output Voltage Range
: 1.5V~30V (externally set)
Reference voltage 0.9V (±2.0%)
Oscillation Frequency
: 100kHz (±15%)
Output Current
:
≥80mA
(V
IN
=3.6V, V
OUT
=15V)*
Control
: XC9120 (PWM)
: XC9121 (PWM/PFM Automatic)
: XC9122 (PWM/PFM Externally)
High Efficiency
: 85% (TYP.)
: (V
IN
=3.6V, V
OUT
=15V,
I
OUT
=10mA)*
Stand-by Function
: ISTB=1.0μA (MAX.)
Load Capacitors
: Low ESR capacitor compatible
Current Limiter
: Operates when ripple is 250mV
Maximum Duty Ratio
: 93% (TYP.) for High Step-up Ratio
Package
: SOT-25, USP-6C
* When using external components showing in the circuit below.
■FEATURES
■TYPICAL
APPLICATION CIRCUIT
RSENSE: 50mΩ
for Ceramic CL
SD:
XB01SB04A2
■TYPICAL
PERFORMANCE
CHARACTERISTICS
XC9122D091 (100kHz, 15.0V)
100
L=47uH(CDRH5D28),SD:XB01SB04A2
CL=40uF(Ceramic),Tr:161A11A1
4.2V
L: 47uH
VOUT=15V
Efficiency: EFFI(%)
CFB: 33pF
RFB1:
470kΩ RFB2: 30kΩ
1
5
Nch Power
MOS FET
XP161A1355
80
60
40
20
0
0.1
PWM/PFM
VIN=2.7V
3.2V
PWM
3.6V
CIN
Ceramic CL:
10uF x 4
CE
2
3
4
VIN=
2.7V~4.2V
1
10
100
Output Current: IOUT(mA)
1/17
XC9120/XC9121/XC9122
Series
■PIN
CONFIGURATION
EXT
GND
4
4
* 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
DD
pin
(Pin #2).
5
1
FB
2
2
V
DD
3
3
CE
USP-6C (BOTTOM VIEW)
SOT-25 (TOP VIEW)
■PIN
ASSIGNMENT
PIN NUMBER
SOT-25
1
2
3
4
5
-
USP-6C
6
2
4
3
1
5
PIN NAME
FB
V
DD
CE
CE (/PWM)
GND
EXT
NC
FUNCTION
Output Voltage Setting Resistor Connection
Supply Voltage
Chip Enable (Operates when "H" Level)
PWM/PFM Switch*
Ground
External Transistor Drive Connection
No Connection
* The XC9122 series combines the CE pin and PWM/PFM switch pin.
■FUNCTION
XC9120/9121 Series
CE PIN
H
L
XC9122 Series
CE/PWM PIN
H
More than V
DD
- 0.2 (V)
M
0.65 ~ V
DD
– 1.0 (V)
L
0 ~ 0.2 (V)
IC OPERATIONAL STATE
Operation
Shut-Down
IC OPERATIONAL STATE
Operation (PWM control)
Operation (PWM/PFM automatic switching control
Shut-Down
■
PRODUCT CLASSIFICATION
●Ordering
Information
XC9120①②③④⑤⑥: PWM Control
XC9121①②③④⑤⑥: PWM/PFM Automatic Switching Control
XC9122①②③④⑤⑥: PWM/PFM Externally Switching Control
DESIGNATOR
①
② ③
④
⑤
⑥
DESCRIPTION
Type of DC/DC Controller
Output Voltage
Oscillation Frequency
Package
Device Orientation
SYMBOL
B
D
09
1
M
E
R
L
DESCRIPTION
: With current limiter
: No current limiter
: FB Voltage (ex. FB Voltage=0.9V→②=0,
③=9)
: 100kHz
: SOT-25 (SOT-23-5)
: USP-6C
: Embossed tape, standard feed
: Embossed tape, reverse feed
2/17
XC9120/XC9121/XC9122
Series
■
BLOCK DIAGRAM
■
ABSOLUTE MAXIMUM RATINGS
Ta=25℃
PARAMETER
V
DD
Pin Voltage
FB Pin Voltage
CE Pin Voltage
EXT Pin Voltage
EXT Pin Current
Power Dissipation
SOT-25
USP-6C
SYMBOL
V
DD
V
FB
V
CE
V
EXT
I
EXT
Pd
Topr
Tstg
RATINGS
-0.3 ~ 12.0
-0.3 ~ 12.0
-0.3 ~ 12.0
-0.3 ~ V
DD
+ 0.3
±100
150
100
-40 ~ +85
-55 ~ +125
UNIT
V
V
V
V
mA
mW
℃
℃
Operating Temperature Range
Storage Temperature Range
* Voltage is all ground standardized.
3/17
XC9120/XC9121/XC9122
Series
■ELECTRICAL
CHARACTERISTICS
XC9120B091, XC9121B091, XC9122B091
XC9120D091, XC9121D091, XC9122D091
PARAMETER
FB Voltage
Supply Voltage Range
(*1)
Output Voltage Setting
Range
Operation Start Voltage
Oscillation Start Voltage
(*1)
Operation Hold Voltage
Supply Voltage 1
Supply Voltage 2
Stand-by Current
Oscillation Frequency
Maximum Duty Ratio
PFM Duty Ratio
Over Current Sense
Voltage (*2)
Efficiency (*3)
Soft-Start Time
CE "H" Voltage
CE "L" Voltage
EXT "H" ON Resistance
EXT "L" ON Resistance
PWM ‘H’ Voltage (*4)
PWM ‘L’ Voltage (*4)
CE "H" Current
CE "L" Current
FB "H" Current
FB "L" Current
SYMBOL
V
FB
V
DD
V
OUTSET
V
ST1
V
ST2
V
HLD
I
DD1
I
DD2
I
STB
F
OSC
MAXDTY
PFMDTY
V
LMT
EFFI
T
SS
V
CEH
V
CEL
R
EXTH
R
EXTL
V
PWMH
V
PWML
I
CEH
I
CEL
I
FBH
I
FBL
Same as I
DD1
Same as I
DD1
Same as I
DD1
, V
EXT
=V
OUT
-0.4V
Same as I
DD1
, V
EXT
=0.4V
I
OUT
=1mA
I
OUT
=1mA
(XC9122B/D type)
(XC9122B/D type)
Recommended circuit using 2SD1628,
V
IN
=V
OUTSET
×0.6,
V
DD
=3.0V,
I
OUT
=1.0mA
Recommended circuit using 2SD1628
V
OUT
=3.3V, I
OUT
=1.0mA
No external components,
CE connected to V
DD
, Voltage applied,
FB=0V
Recommended circuit using 2SD1628
V
OUT
=3.3V, I
OUT
=1.0mA
Same as V
ST2
, V
DD
=3.0V
Same as I
DD1
, FB=1.2V
Same as I
DD1
, CE=0V
Same as I
DD1
Same as I
DD1
No Load (XC9121B/D, XC9122B/D types)
Step input to FB
(Pulse width: 2.0μs or more)
EXT= Low level voltage
(XC9120/9122/9122B type)
I
OUT
=10mA
CONDITIONS
MIN.
0.882
1.8
1.5
-
-
-
-
-
-
85
89
24
150
-
5.0
0.65
-
-
-
V
DD
-0.2
-
-
-
-
-
(FOSC=100kHz)
TYP.
0.900
-
-
-
-
-
25
13
-
100
93
32
250
85
10.0
-
-
24
16
-
-
-
-
-
-
MAX.
0.918
6.0
30.0
0.9
0.8
0.7
50
30
1.0
115
96
40
400
-
20.0
-
0.20
36
24
-
V
DD
-1.0
0.1
-0.1
0.1
-0.1
UNIT
V
V
V
V
V
V
μA
μA
μA
kHz
%
%
mV
%
ms
V
V
Ω
Ω
V
V
μA
μA
μA
μA
Ta=25℃
CIRCUIT
④
①
②
③
④
③
④
④
⑤
④
④
⑥
⑥
①
①
⑤
⑤
④
④
①
①
⑤
⑤
⑤
⑤
Same as I
DD2
, CE=V
DD
Same as I
DD2
, CE=0V
Same as I
DD2
, FB=V
DD
Same as I
DD2
, FB=0V
Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOSFET should be connected.
When V
OUT is set at
15V, V
IN
=V
DD
=3.6V.
NOTE:
*1: Although the IC starts step-up operations from a V
DD
=0.8V, the output voltage and oscillation frequency are stabilized at V
DD
>1.8V.
Therefore, a V
DD
of more than 1.8V is recommended when V
DD
is supplied from V
IN
or other power sources.
*2: The overcurrent limit circuit of this IC is designed to monitor the ripple voltage so please select your external components carefully to
prevent V
LMT
being reached under low temperature conditions as well as normal operating conditions. Following current limiter circuit
operation, which in turn causes the IC’s operations to stop, the IC resumes its operation with a toggle of the CE pin or by turning the power
supply back on.
*3: EFFI:
{(output voltage) x (output current)} / {(input voltage) x (input current)} x 100
*4: The XC9122 series’ CE pin combines PWM/PFM external switch pin. In the operation state, PWM control becomes effective when the CE
pin is more than V
DD
-0.2V. When the CE pin is less than V
DD
-1.0V and more than VCEH, PWM/PFM automatic switching control becomes
effective with 32% duty.
4/17
XC9120/XC9121/XC9122
Series
■
TYPICAL APPLICATION CIRCUIT
RSENSE
CFB
VOUT
RFB1
1
CL
2
3
CE
NPM Tr
4
CB
RFB2
5
Nch Power
MOS FET
CIN
VIN
RB
SD
When obtaining V
DD
from a source other than V
IN
(V
OUT
),
please insert a by-pass capacitor C
DD
between the V
DD
pin and the GND pin in order to provide stable operations.
Please place CL and C
IN
as close as to the V
OUT
and V
DD
pins respectively and also close to the GND pin.
Strengthen the wiring sufficiently.
R
SENSE
should be removed and shorted when the C
L
capacitor except for ceramic or low ESR capacitor is
used.
Insert R
B
and C
B
when using a bipolar
NPN transistor.
5/17
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