)
)
XC9131 Series
1A Driver Transistor Built-In, Multi Functional Step-Up DC/DC Converters
■GENERAL DESCRIPTION
XC9131 series are synchronous step-up DC/DC converters with a 0.2Ω(TYP.) N-channel driver transistor and a 0.2Ω(TYP.)
synchronous P-channel switching transistor built-in. A highly efficient and stable current can be supplied up to 1.0A by
reducing ON resistance of the built-in transistors.
The series are able to start operation under the condition which has 0.9V input voltage to generate 3.3V output voltage with a
33Ωload resistor, suitable for mobile equipment using only one Alkaline battery or one Nickel metal hydride battery.
During the operation of a shutdown, the load disconnection function enables to cut the current conduction path from the input to
the output.
The series has 0.5V (±0.01V) reference voltage integrated and being able to set an output voltage with external components.
■APPLICATIONS
●Digital audios
●Digital cameras, Video equipments
●Wireless mice
●Various standard power supplies using batteries
such as alkaline (1 to 3 cells), nickel metal hydride,
or lithium ion (1 cell)
■TYPICAL APPLICATION CIRCUIT
●XC9131 Series (FB)
■ FEATURES
Input Voltage Range : 0.65V~5.5V
Output Voltage Range : 1.8V~5.0V
(V
Oscillation Frequency : 1.2MHz (±15%)
Input Current : 1.0A
Output Current : 500mA @ V
Control Mode Selection : PWM or Auto PWM/PFM
Load Transient Response :100mV @ V
Protection Circuits : Thermal shutdown
Functions : Soft-start
Load Disconnection Function
C
Flag-out Function
UVLO
Output Capacitor
Operating Ambient Temperature
Package : USP-10B
Environmentally Friendly : EU RoHS Compliant, Pb Free
■TYPICAL PERFORMANCE
CHARACTERISTICS
XC9131x05C (V
L=4.7μH(LTF5022-LC), CL=20μF(LMK212BJ106KG*2
CIN=10μF(LMK212BJ106KG), CDD=0.47μF(EMK107BJ474KA
100
90
80
70
60
50
40
Efficiency: EFFI (%)
30
20
10
0
0.1 1 10 100 1000
Output Current: I
☆GreenOperation Compatible
=0.50V±0.01V Set up with external
FB
components)
OUT
OUT
OUT
=3.3V)
VIN=1.8V
2.4V
PWM/P FM
PWM
(mA)
R
FB1
V
=1.8V, I
IN
Over-current limit
Integral latch method
Auto Discharge Function
L
: Ceramic Capacitor
: -40℃~+85℃
OUT
=560kΩ, R
=100kΩ, CFB=10pF, FO=OPEN
FB2
OUT
ETR0412-008
=3.3V, VIN=1.8V(TYP.)
=3.3V,
=1mA→200mA
1/28
XC9131 Series
■ PIN CONFIGURATION
FO
CDD
3
65
74
8
EN
FBMODE
AGND
FO
CDD
3
BAT
2
Lx
1
USP-10B
(BOTTOMVIEW)
XC9135 series
connected to the AGND (No.8) or PGND (No.9) pin.
9
10
PGND
VOUT
2
Lx
BAT
1
USP-10B
(BOTTOMVIEW)
■ PIN ASSIGNMENT
PIN NUMBER PIN NAME FUNCTIONS
1
2
3
4
5
6
7
8
9
10
* The dissipation pad for the USP-10B 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
*Please short the GND pins (pins 8 and 9).
■ FUNCTION CHART
1. EN Pin Function
EN PIN FUNCTIONS
H Operation
L Stop
* Do not leave the EN pin open.
2. MODE Pin Function
MODE PIN FUNCTIONS
H PWM
L PWM/PFM automatic control
* Do not leave the MODE pin open.
BAT Power Input
Lx Switching
CDD Bypass Capacitor Connection
MODE Mode Switching
FO Flag Output
EN Enable
FB Output Voltage Monitoring
AGND Analog Ground
PGND Power Ground
VOUT Output Voltage
65
74
8
9
10
EN
CDFMODE
AGND
PGND
VOUT
CDD
3
2
Lx
BAT
1
USP-10B
(BOTTOMVIEW)
XC9136 series
65FO
74
8
9
10
EN
NCMODE
AGND
PGND
VOUT
2/28
■ PRODUCT CLASSIFICATION
●Ordering Information
XC9131①②③④⑤⑥-⑦
(*1)
XC9131
Series
DESIGNA
TOR
ITEM SYMBOL DESCRIPTION
Ａｕｔｏ Ｄｉｓｃｈａｒｇｅ
L
pin can not be connected to the different output pin such as another supply
OUT
F
With C
V
(AC adaptor).
① TYPE
Ａｕｔｏ Ｄｉｓｃｈａｒｇｅ
L
pin can be connected to the different output pin such as another supply
H
②③ Reference Voltage (FB) 05
Without C
V
OUT
(AC adaptor).
Reference Voltage
e.g. FB product, ②③=05 (Fixed)
④ Oscillation Frequency C 1.2MHz
(*1)
⑤⑥-⑦
Package (Order Unit)
DR-G USP-10B (3,000/Reel)
(*1)
The ”-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
3/28
XC9131 Series
■ BLOCK DIAGRAMS
●XC9131F Series
* Diodes inside the circuit are an ESD protection diode and a parasitic diode.
●XC9131H Series
The XC9131H series does not have C
discharge function.
L
4/28
■ ABSOLUTE MAXIMUM RATINGS
PAR AMETE R SYMBOL RATINGS UNITS
V
Pin Voltage V
OUT
CDD Pin Voltage V
-0.3～7.0 V
OUT
-0.3～7.0 V
CDD
FO Pin Voltage VFO -0.3～7.0 V
FO Pin Current IFO 10 mA
FB Pin Voltage VFB -0.3～7.0 V
BAT Pin Voltage V
MODE Pin Voltage V
-0.3～7.0 V
BAT
-0.3～7.0 V
MODE
EN Pin Voltage VEN -0.3～7.0 V
Lx Pin Voltage VLx -0.3～V
Lx Pin Current ILx ±2000 mA
Power Dissipation USP-10B Pd 150 mW
Operating Ambient Temperature
Storage Temperature
* AGND and PGND are standard voltage for all of the voltage.
Topr -40 ～ +85
Tstg -55 ～ +125
+0.3 V
OUT
Ta=25℃
o
C
o
C
XC9131
Series
5/28
XC9131 Series
■ELECTRICAL CHARACTERISTICS
●XC9131F05C / XC9131H05C
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Input Voltage VIN
FB Voltage VFB
Output Voltage Setting Range V
OUTSET
Operation Start Voltage V
Operation Hold Voltage V
Supply Current Iq
Input Pin Current I
Stand-by Current (XC9131F) - 0.10 2.0
Stand-by Current (XC9131H)
Lx Leakage Current I
Oscillation Frequency f
Maximum Duty Cycle D
Minimum Duty Cycle D
PFM Switching Current I
Efficiency
LX SW "Pch" ON Resistance R
LX SW "Nch" ON Resistance R
(*2)
EFFI
I
BAT
STB
OSC
PFM
Maximum Current Limit I
Soft-Start Time tSS
Thermal Shut Temperature T
Hysteresis Width T
CL Discharge Resistance
(XC9131F)
FO ON Resistance RFO V
FO Leakage Current I
R
DCHG
FO_LEAK
EN "H" Voltage V
EN "L" Voltage V
= 3.3V, V
V
OUT
Voltage to start oscillation while V
RL=1kΩ, V
ST1
HLD
LxL
MAX
MIN
LxP
LxN
LIM
I
=100mA, L=4.7μH(LTF5022-LC), CFB=10pF
OUT
V
Lx
R
=33Ω, V
L
=1kΩ, V
R
L
=0.5V×1.1 (oscillation stops)
V
FB
V
=1.8V, VEN=3.3V, VFB=0.5V×1.1
IN
V
IN=VLx
V
IN=VLx
V
=0.5V×0.9
FB
V
=0.5V×0.9
FB
V
=0.5V×1.1
FB
V
=0V, RL=330Ω
MODE
=3.3V, VFB=0.5V×1.1, I
V
=0.5V×0.9
FB
>2.5V
V
OUT
= 3.3V, VFB=0.5V×0.95
V
IN
Time to start oscillation while V
TSD
HYS
V
ENH
ENL
Voltage to start oscillation while VEN=0.2V→0.75V
Voltage to stop oscillation while VEN=0.75V →0.2V
V
IN=VOUT
=3.3V, VFO=0.5V
EN
FO
=3.3V, VFB=0.5V×0.9
V
IN
=3.3V, VFB=0.5V×0.9
V
IN
=0V
MODE
MODE
MODE
MODE
=0V
=0V
=0V
=0.511V→0.49V
FB
0.490 0.500 0.510 V
1.8 - 5.0 V
=3.3V
=3.3V
1.02 1.20 1.38 MHz
88 93 97 %
=0V→VIN
EN
(*3)
1.2 1.5 2.0 A
2.8 5.0 8.0 ms
OUT
(*7)
=200mA
(*4)
=2.0V
(*5)
(*6)
100 150 200
100 200 400
=5.5V - 0 1
0.75 - 5.5 V
AGND - 0.2 V
- - 5.5 V
- - 0.85 V
- -
0.9
- 0.65 - V
- 36 50
- 0.65 2.0
- 0.90 5.0
- 0.1 2.0
- - 0 %
- 250 350 mA
- 93 - %
- 0.20 0.35
(*1)
- 0.20
0.35
- 150 - oC
- 20 - oC
(*1)
(*1)
Ω
(*1)
Ω
Ta=25 oC
CIRCUIT
⑤
①
①
V
①
①
μA ②
μA ⑥
μA ③
μA ④
⑤
⑤
⑤
①
①
⑧
⑨
①
⑤
Ω ⑥
Ω ⑦
μA ⑦
⑤
⑤
6/28
)
XC9131
Series
■ELECTRICAL CHARACTERISTICS (Continued
●XC9131F05C / XC9131H05C (Continued)
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
MODE "H" Voltage V
MODE "L" Voltage V
EN "H" Current
EN "L" Current
MODE "H" Current
MODE "L" Current
FB "H" Current
FB "L" Current
External Components: CIN=10μF(ceramic), L=2.2μH(VLCF4020 TDK), CDD=0.47μF(ceramic), R
=22μF(ceramic), CFB=0pF
C
IN
Test Conditions:
For the Circuit No.1, unless otherwise stated, V
For the Circuit No.2, unless otherwise stated, V
For the Circuit No.3, unless otherwise stated, V
For the Circuit No.4, unless otherwise stated, V
For the Circuit No.5, unless otherwise stated, V
For the Circuit No.6, unless otherwise stated, V
For the Circuit No.7, unless otherwise stated, V
For the Circuit No.8, unless otherwise stated, V
For the Circuit No.9, unless otherwise stated, V
NOTE:
*
1 : Designed value
*
2 : Efficiency ={(output voltage) X (output current)} ÷ {(input voltage) X (input current)} X 100
*
3 : LX SW "P-ch" ON resistance=（VLx-V
*
4 : Testing method of LX SW "N-ch" ON resistance is stated at test circuits.
*
5 : CL Discharge resistance
*
6 : FO ON resistance = V
*
7 : When the output voltage is lower than 2.5V, the maximum current limit may become low.
= V
÷ V
OUT
÷ FO pin measure current
FO
MODEH
MODEL
I
ENH
I
ENL
I
MODEH
I
MODEL
I
FBH
I
FBL
pin test voltage）÷200mA
OUT
pin measure current
OUT
R
L
R
=330Ω, Voltage operates at PWM control
=330Ω, Voltage operates at PFM control
L
V
IN=VOUT=VFB=VEN
V
IN=VOUT=VFB
V
IN=VOUT=VFB=VEN=VMODE
V
IN=VOUT=VFB=VEN
V
IN=VOUT=VEN=VFB
V
IN=VOUT=VEN
=1.8V, VEN=V
IN
IN=VOUT=VEN
OUT=VEN=VMODE=VFB
OUT=VEN=VMODE=VFB
=0.9V, V
IN
OUT
IN=VOUT=VFB
IN=VEN=VMODE
IN=VOUT=VEN
OUT=VEN=VMODE=Vpull
=3.3V, VEN=V
=5.5V - - 0.1
=5.5V, VEN=0V -0.1 - -
=5.5V - - 0.1
=5.5V, V
=0V -0.1 - -
MODE
=5.5V - - 0.1
=5.5V, VFB=0V -0.1 - -
=3.3V
MODE
=3.3V, V
=3.3V, VEN=V
=3.3V
=3.3V,VFB=V
=0V (GND connected)
MODE
=0V (GND connected)
=0V (GND connected)
=3.3V
=0V (GND connected)
MODE=VFB
=0V (GND connected)
MODE
=0V (GND connected)
MODE
=560kΩ, R
FB1
0.75 - 5.5 V
AGND - 0.2 V
=100kΩ
FB2
μA ②
μA ②
μA ②
μA ②
μA ②
μA ②
CIRCUIT
①
①
7/28
XC9131 Series
■TYPICAL APPLICATION CIRCUIT
●XC9131 Series
<XC9131 Series Output Voltage Setting>
Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation,
based on the values of R
The value of C
than 20 kHz. Also, when the input voltage, VIN is lower than 1.5V, CFB is 0pF. Adjustments are depending on
application, inductance (L), load capacitance (C
[Example of calculation]
When C
[Typical example]
V
=0.5×(R
OUT
, speed-up capacitor for phase compensation, should be 0pF or fzfb = 1/(2π×C
FB
When R
V
OUT
=560kΩ,R
FB1
=10pF, fzfb=1/（2π×10p×560k）=28.42kHz
FB
(V) R
FB1
1.8 390 150 0
3.3 560 100 10
5.0 270 30 15
[External Components]
f
=1.2MHz
OSC
L: 2.2μH～4.7μH
VLCF4020 series, LTF5022-LC series
: Should be selected in 20μF or higher
C
L
Capacitor JMK212BJ106KG×2、LMK212BJ106KG×2、LMK316BJ226ML is recommended.
Ceramic capacitor: B (JIS standard) or X7R, X5R (EIA standard)
CIN: 10μF
Capacitor JMK212BJ106KG or LMK212BJ106KG is recommended.
Ceramic capacitor: B (JIS standard) or X7R, X5R (EIA standard)
CDD: 0.47μF (Ceramic capacitor)
voltage is constantly applied to the CDD capacitor. While selecting a part, please concern about capacitance reduction and voltage
* V
DD
durability.
* For the coil L, please use 2.2μH to 4.7μH. However, when the input voltage V
* Capacitance C
When you select the external components, please consider capacitance loss and voltage durability.
* If using tantalum or low ESR electrolytic capacitors please be aware that ripple voltage will be higher due to the larger ESR (Equivalent
Series Resistance) values of those types of capacitors. Please also note that the IC’s operation may become unstable with such
capacitors so that we recommend to test on the board before usage.
* If using electrolytic capacitor for the C
is recommended 20μF or higher. (Ceramic capacitor compatible)
L
FB1 and RFB2. The sum of RFB1 and RFB2 should normally be 1000kΩ or less.
)/R
FB1+RFB2
=100kΩ, V
FB2
(kΩ) R
FB2
L) and dropout voltage.
=0.5×(560k+100k)/100k=3.3V
OUT
(kΩ) C
FB2
, please connect a ceramic capacitor in parallel.
L
FB
(pF)
is lower than 1.5V, please use 2.2μH.
IN
×
R
FB
) which is higher
FB1
8/28
XC9131
Series
■OPERATIONAL EXPLANATION
The XC9131 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase
compensation circuit, N-channel driver transistor, P-channel synchronous rectification switching transistor and current limiter
circuit.
The XC9131 series has FB pin for external components
voltage with the FB pin feed back voltage via resistors RFB1 and RFB2. Phase compensation is performed on the resulting error
amplifier output, to input a signal to the PWM comparator to determine the turn-on time of the N-channel driver transistor
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 N-channel driver transistor’s turn-on 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 source provides the reference voltage to ensure stable output of the DC/DC converter.
<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The frequency is fixed internally at 1.2MHz. The Clock generated is
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 resistors (R
the error amplifier increases. The gain and frequency characteristics of the error amplifier are optimized internally.
< Maximum Current Limit>
The current limiter circuit monitors the maximum current flowing through the N-channel driver transistor connected to the Lx
pin.
① When the driver current is greater than a specific level (equivalent to peak coil current), the maximum current limit function
starts to operate and the pulses from the Lx pin turn off the N-channel driver transistor at any given time.
② When the driver transistor is turned off, the limiter circuit is then released from the maximum 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 current state.
④ When the over current state is eliminated, the IC resumes its normal operation.
The XC9131 series does not have this latch function, so operation steps ① through ③ repeat until the over current state ends.
Please note that the current flow into the N-channel driver transistor is different from output current I
FB1 and RFB2). When the FB pin is lower than the reference voltage, output voltage of
R
FB１
and R
. The error amplifier compares the internal reference
FB2
.
OUT
9/28
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