■
■
A
■
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0
f
（%）
XC9301/XC9302 Series
ETR0601_001c
PWM,PWM/PFM Switching Step-Up & Down DC/DC Converter Controller ICs
GENERAL DESCRIPTIO N
The XC9301/XC9302 series are step-up/down DC/DC conv erter controller ICs with fast, low ON resistance drivers built-in. A
versatile, large output current, step-up/down DC/DC converter can be realized using only 4 type of basic external components
two transistors, one inductor, two diodes and capacitors.
Output voltage is selectable in 0.1V increments within a 2.4V ~ 6.0V (±2.5% accuracy) range and switching frequency is set
at 180kHz or 300kHz.
The XC9302 series switches from PWM to PFM control during light loads and the series offers high efficiencies from light
loads through to large output currents.
Soft-start time is internally set to 10ms which offers protection against inrush currents when the power is turned on and also
against voltage overshoot.
During shutdown (CE pin = L), consumption current can be reduced to as little as 0.5μA or less.
PPLICATIONS
●Mobile phones
●PDAs
●Palmtop computers
●Portable audio equipment
●Various power supplies
TYPICAL APPLICATION CIRCUIT
FEATURES
Input Voltage Range : 2.0V ~ 10V
Output Voltage Range : 2.4V ~ 6.0V (±2.5% accuracy)
Oscillation Frequency : 180kHz, 300kHz
Output Current : 250mA(V
Efficiency : 81%(TYP.) @ V
Stand-By : I
Maximum Duty Cycle : 85%(TYP.)
Package : SOT-25
Environmentally Friendly: EU RoHS Compliant, Pb Free
■TYPICAL PERFORMANCE
CHARACTERISTICS
XC9302A502 (180kHz, V
●Efficiency vs. Output Current
PSW=XP162A12A6PR,CL=47μF ((MCE series, Tantalum))×2,
NSW=XP161A1265PR,CIN=220μF (Electrolytic, PJ type),SD=U2FWJ44N,RDD=10Ω,
L=22μH (CR54),CDD=47μF (MCE series, Tantalum)
100
80
60
40
ficiency:EFFI
E
20
☆Green Operation Compatible
(selectable in 0.1V increments)
(±15% accuracy)
IN=2.4V, VOUT=3.3V)
OUT=5.0V,
78%(TYP.) @ V
STB = 0.5μA (MAX.)
5.0V)
OUT
VIN=2V
OUT=3.3V
4V
6V
0
0.1 1 10 100 100
Output Current:I
OUT
（mA）
1/13
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■
■
■
XC9301/XC9302 Series
PIN CONFIGURATION
PRODUCT CLASSIFICATION
●Ordering Information
XC9301①②③④⑤⑥-⑦
XC9302①②③④⑤⑥-⑦
(*1)
: PWM control
(*1)
: PWM/PFM switching control
DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION
PIN ASSIGNMENT
PIN NUMBER PIN NAME FUNCTION
1 GND Ground
2 VDD Power Supply
3 EXT/ External Tr. Drive
4 VOUT Output Voltage Monitor
5 CE Chip Enable
①
②③
Standard A Fixed
Output Voltage 20~60
e.g. VOUT=3.0V→②=3, ③=0, VOUT=5.3V→②=5, ③=3
2 180kHz
④
Oscillation Frequency
3 300kHz
⑤⑥-⑦
(*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 or
representative. (Standard orientation: ⑤R-⑦, Reverse orientation: ⑤L-⑦)
BLOCK DIAGRAM
Packages
Taping Type
(*2)
MR-G SOT-25
2/13
■
A
XC9301/XC9302
Series
BSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL RATINGS UNITS
VDD Pin Voltage VDD -0.3〜12.0 V
VOUT Pin Voltage VOUT -0.3〜12.0 V
CE Pin Voltage VCE -0.3〜12.0 V
EXT/ Pin Voltage VEXT/ -0.3〜VDD+0.3 V
EXT/ Pin Current IEXT/ ±100 mA
Power Dissipation Pd 150 mW
Operating Temperature Range Topr -40〜+85 ℃
Storage Temperature Range Tstg -40〜+125 ℃
Ta = 25℃
3/13
■
■
XC9301/XC9302 Series
ELECTRICAL CHARACTERISTICS
XC9301x332MR, XC9302x332MR
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Output Voltage VOUT 3.218 3.300 3.383 V
Supply Voltage VDD 2.0 - 10.0 V
Supply Current 1 IDD1 VOUT=CE: Setting output voltage × 0.95 applied - 80 140 μA
Supply Current 2 IDD2 VOUT=CE: Setting output voltage + 0.5 applied - 15 26 μA
OUT: Setting output voltage × 0.95 applied,
Stand-By Current ISTB
Oscillation Frequency FOSC
Maximum Duty Ratio MAXDTY
PFM Duty Ratio
Efficiency
(*1)
PFMDTY No Load 15 25 35 %
(*2)
EFFI
V
CE=0V
DD=VOUT=CE:
V
Setting output voltage × 0.95 applied
DD=VOUT=CE:
V
Setting output voltage × 0.95 applied
DD=VIN=CE:
V
Setting output voltage × 0.95 applied
Soft-Start Time TSS 5.0 10.0 20.0 ms
CE 'H' Voltage VCEH VOUT: Setting output voltage × 0.95 applied 0.65 - - V
CE 'L' Voltage VCEL VOUT: Setting output voltage × 0.95 applied - - 0.20 V
EXT/ 'H' ON Resistance REXTBH Same as IDD1, VEXT/ = VOUT - 0.4V - 29 43 Ω
EXT/ 'L' ON Resistance REXTBL Same as IDD1, VEXT/ = 0.4V - 19 27 Ω
Test Conditions: Unless otherwise stated, VDD = 3.3V, IOUT = 130mA
NOTE: *1: XC9302 series only
*2: EFFI={[(output voltage) × (output current)] / [(input voltage) × (input current)]} × 100
XC9301x333MR, XC9302x333MR
(VOUT=3.3V, FOSC=300kHz) Ta=25℃
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Output Voltage VOUT 3.218 3.300 3.383 V
Supply Voltage VDD 2.0 - 10.0 V
Supply Current 1 IDD1 VOUT=CE: Setting output voltage × 0.95 applied - 130 200 μA
Supply Current 2 IDD2 VOUT=CE: Setting output voltage + 0.5 applied - 20 35 μA
OUT: Setting output voltage × 0.95 applied,
Stand-By Current ISTB
Oscillation Frequency FOSC
Max. Duty Ratio MAXDTY
PFM Duty Ratio
Efficiency
(*1)
PFMDTY No Load 15 25 35 %
(*2)
EFFI VDD=VIN=CE:
V
CE=0V
DD=VOUT=CE:
V
Setting output voltage × 0.95 applied
DD=VOUT=CE:
V
Setting output voltage × 0.95 applied
Setting output voltage × 0.95 applied
Soft-Start Time TSS 5.0 10.0 20.0 ms
CE 'H' Voltage VCEH VOUT: Setting output voltage × 0.95 applied 0.65 - - V
CE 'L' Voltage VCEL VOUT: Setting output voltage × 0.95 applied - - 0.20 V
EXT/ 'H' ON Resistance REXTBH Same as IDD1, VEXT/ = VOUT - 0.4V - 29 43 Ω
EXT/ 'L' ON Resistance REXTBL Same as IDD1, VEXT/ = 0.4V - 19 27 Ω
Test Conditions: Unless otherwise stated, VDD = 3.3V, IOUT = 130mA
NOTE: *1: XC9302 series only
*2: EFFI={[(output voltage) × (output current)] / [(input voltage) × (input current)]} × 100
TYPICAL APPLICATION CIRCUIT
External Components
PSW: XP162A12 (SOT-89, TOREX)
NSW: XP161A12 (SOT-89, TOREX)
L : 22μH (CR54, SUMIDA)
SD : U2FWJ44N ( Schottky, TOSHIBA )
C
C
220μF (Electrolytic, NICHICON, PJ type)
(VOUT=3.3V, FOSC=180kHz)
- - 0.5 μA
153 180 207 kHz
78 85 92 %
- 78 - %
- - 0.5 μA
255 300 345 kHz
78 85 92 %
- 78 - %
L : 16V, 47μF×2 (Tantalum, MCE series, NICHICON )
IN : 16V, 22μF (Tantalum, MCE series, NICHICON )
Ta=25℃
4/13
■
XC9301/XC9302
Series
OPERATIONAL EXPLANATION
The XC9301/9302 series are PWM (PWM/PFM switching) step-up/down DC/DC converter controller ICs. The XC9302 series
switches to PFM operations during light loads and is very efficient over a wide range in relation to load. Further, the efficiency
can be maintained over a wide input voltage range as both step-u p & step-down operations are PWM controlled. Output
voltage settings are laser trimmed.
<ON TIME>
P-ch MOSFET (PSW) = ON, N-ch MOSFET (NSW) = ON: Current flows from VIN via PSW, L, NSW, to GND: L is charged.
<OFF TIME>
P-ch MOSFET (PSW) = OFF, N-ch MOSFET (NSW) = OFF: Current flows from GND via SD1, L, SD2, to V
due to the charge stored at L.
By comparing VOUT with the internal reference voltage, the ON TIME vs. OFF TIME ratio can be regulated & output stability
can be protected.
<Error Amp.>
The error amplifier is used as an output voltage monitor. It compares the reference voltage with the feedback from the voltage
divided by the internal resistor. Should a voltage higher than the reference voltage be fedback, the output of the error amp will
increase.
<PWM Comparator>
The PWM comparator compares the output of the error amp with the ramp wave. When the voltage at the output of the error
amp is low, the EXT/ pin will be low level (Switching ON time).
<Ramp Wave Generator>
The ramp wave generator generates the switching frequency's ramp wave.
<PWM / PFM Controller>
With the XC9302 series, control is automatically switched between PWM and PFM according to the size of the load.
<Vref with Soft Start, CE>
The start up of the Vref voltage at the error amp's input is gradual due to the internal capacitor and low current circuit.
Because of this soft-start function, the operations of the error amp's 2 inputs are balanced and the EXT/ pin's ON TIME can
be manipulated to produce longer ON times. Further, with the U.V.L.O. function, the signal will be such so as not to turn the
MOSFET switch ON until any instability in the internal circuit stabilizes during soft-start time. Even in cases where input
voltage is so low as to produce instability in the IC, the U.V.L.O. function will operate and the MOSFET switch will be turned
OFF.
OUT: VOUT rises
5/13
y
A
■
)
XC9301/XC9302 Series
OPERATIONAL EXPLANATION (Continued
●Product Selection (Notes)
XC9301/02 series is a group of PFM controlled (XC9302 series switches from PWM to PFM control during light loads)
step-up and down DC/DC converters. The series is highly efficient with a wide range of input voltage since its stepping-up
and down operation is controlled by PWM movements. In general, there are several methods available for obtaining a
stable output voltage at such times when input voltage is changing from being higher than the established output voltage to
being lower than the established output voltage. Each method has its merits and demerits but is essential that a method,
which provides the best results in terms of input and output under actual operating conditions. Below, two methods are
highlighted and their respective performances in terms of efficiency are compared. This is an efficiency comparison of two
ways, step-up DC/DC converter + VR and step-up & down DC/DC converter.
[Step-Up DC/DC Converter + VR] (XC6361/62)
◆Step-up mode (Input voltage < setting output voltage + 0.4V)
After input voltage has been stepped-up to setting output voltage + 0.4V by the step-up DC/DC converter, the output
voltage will be regulated to the set value by the VR. (0.4V loss via the VR)
◆Step-down mode (Input voltage >
After input voltage has been stepped-up to setting output voltage + 0.4V by the step-up DC/DC converter, the output
voltage will be regulated to the set value by the VR. (Dropout voltage loss via the VR)
[Step-Up & Down DC/DC Converter] (XC9301/02)
◆Setting output voltage obtained as a result of the automatic switching operations of the IC regardless of the difference
between input voltage and set output voltage.
The above graph shows that over a wide input voltage range, the efficiency of the XC9301/02 is more or less constant. On the
other hand, the efficiency of the XC6361/62 is clearly shown to decrease as input voltage increases. In step-down mode i n
particular, the efficiency of the XC9301/02 is much better than the XC6361/62. In applications that use either a standard dry 3
cell battery or a 2 cell lithium Ion battery to obtain an output of 3.3V, for example, the efficiency of the XC9301/02 series is
again much better. Because the XC9301/02 series does not have a series regulator output, we recommend a test with
samples for use in applications where ripple voltage is a problem.
●External Components Selection (Notes)
●The performance of the DC/DC converter IC circuit is heavily reliant upon the performance of the surrounding circuitry and
components. In particular, since the V
smaller the diode, the better the efficiency obtainable. (Refer to the graph below)
●It is also recommended that a switching MOSFET with a small ON resistance be used. With the XC9301/02, an ON
resistance of 500mΩ or less is recommended.
setting output voltage + 0.4V)
Input Voltage vs. Efficienc
XC6361(STEP-UP DCDC+VR)
90
I
OUT
85
80
75
70
65
60
55
Efficiency［%］
50
45
40
=10mA 100mA 200mA
Step-Up Mode
23 45 678
Input Voltage ［V］
F voltage of the Schottky Diode used will have a direct effect upon efficiency, the
V
OUT
=3.3V, I
XC9301(STEP-UP/DOWN DCDC
I
OUT
=10mA 100mA 200mA
Set Output Voltage+0.4V
Step-Down Mode
OUT
=100m
85
Efficiency［%］
80
75
70
VIN=2.4V
IN
=3.0V
V
IN
=4.5V
V
65
0.2 0.4
VF Voltage［V］
6/13
■
OPERATIONAL EXPLANATION (Continued)
●Demo Board Version 1.1
<Jumper Settings>
JP3: Must be connected
JP2: To be connected if using SW (CE pin fixed to V
* Use tinned copper wire for the V
* Connect test pins for the TP1, TP2, TP3, and CE.
Note:
Oscillation may occur as a result of input voltage
instability when the output current is large. At such
times, we recommend that in place of the 220μF, PJ
type capacitor, you connect R1 & C1 as shown in the
diagram on the right hand side. (In case of demo
boards version 1.1, cut the pattern wire of R1
connecting point, then connect R1.)
External Components Demo Board Connection Layout
PSW ： XP162A12 (SOT-89)
NSW ： XP161A12 (SOT-89) →suitable for SOT-23, SOT-89, CPH-6
L ： 22μH (CR54, SUMIDA) →suitable for CR43〜CR105
SD ： U2FWJ44N (Schottky, TOSHIBA) →suitable for MA720, MA735, U2FWJ44N
C
L ： 16V, 47μF×2 (Tantalum, MCE series, NICHICON) →suitable for 1005 type〜D2 Package
CIN ： 16V, 22μF (Tantalum, MCE series, NICHICON)
16V, 220μF (Electrolytic, NICHICON, PJ type)
IN)
IN pin, VOUT pin, GND pin, JP2, and JP3.
XC9301/XC9302
Series
7/13
■
XC9301/XC9302 Series
TYPICAL PERFORMANCE CHARACTERISTICS
XC9302A332 (PWM/PFM switching control, 180kHz, VOUT=3.3V)
(1) Output Voltage vs. Output Current (Topr=25℃)
(2) Efficiency vs. Output Current (Topr=25℃)
(3) Ripple Voltage vs. Output Current (Topr=25℃)
External Components
PSW : XP162A12A6PR CL : 47μF (MCE series, Tantalum) × 2
NSW : XP161A1265PR C
SD : U2FWJ44N R
L : 22μH (CR54) C
V
Output Current=lout (mA)
IN : 220μF (Electrolytic, PJ type)
DD : 10Ω
DD : 47μF (MCE series, Tantalum)
CE=VIN
8/13
■
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
XC9302A332 (PWM/PFM switching control, 180kHz, VOUT=3.3V) (Continued)
(4) Load Transient Response (Topr=25℃)
External Components
PSW : XP162A12A6PR C
NSW : XP161A1265PR C
SD : U2FWJ44N R
L : 22μH (CR54) C
V
L : 47μF (MCE series, Tantalum) × 2
IN : 220μF (Electrolytic, PJ type)
DD : 10Ω
DD : 47μF (MCE series, Tantalum)
CE=VIN
IN=3.0V
V
IN=3.0V
V
XC9301/XC9302
Series
9/13
■
XC9301/XC9302 Series
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
XC9302A502 (PWM/PFM switching control, 180kHz, VOUT=5.0V)
(1) Output Voltage vs. Output Current (Topr=25℃)
(2) Efficiency vs. Output Current (Topr=25℃)
(3) Ripple Voltage vs. Output Current (Topr=25℃)
External Components
PSW : XP162A12A6PR C
NSW : XP161A1265PR C
SD : U2FWJ44N R
L : 22μH (CR54) C
V
L : 47μF (MCE series, Tantalum) × 2
IN : 220μF (Electrolytic, PJ type)
DD : 10Ω
DD : 47μF (MCE series, Tantalum)
CE=VIN
10/13
■
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
XC9302A502 (PWM/PFM switching control, 180kHz, V
(4) Load Transient Response (Topr=25℃)
External Components
PSW : XP162A12A6PR C
NSW : XP161A1265PR C
SD : U2FWJ44N R
L : 22μH (CR54) C
V
OUT=5.0V) (Continued)
L : 47μF (MCE series Tantalum) ×2
IN : 220μF (Electrolytic, PJ type)
DD : 10Ω
DD : 47μF (MCE series Tantalum)
CE=VIN
IN=4.0V
V
VIN=4.0V
XC9301/XC9302
Series
11/13
■
●SOT
■
XC9301/XC9302 Series
PACKAGING INFORMATION
●SOT-25
12/13
-25
MARKING RULE
54
① ② ③ ④
123
①represents the product series
②represents the integer of the output voltage and oscillation frequency
VOLTAGE (V)
③represents decimal number of output voltage and oscillation frequency
VOLTAGE (V)
④represents production lot number
0 to 9, A to Z reverse character 0 to 9, A to Z repeated
(G, I, J, O, Q, W excluded)
MARK PRODUCT SERIES
A XC9301AxxxMx
K XC9302AxxxMx
OUTPUT
FREQUENCY=180kHz
（XC9301/XC9302Axx2Mx）
MARK
FREQUENCY=300kHz
(XC9301/XC9302Axx3Mx)
2.x 2 2
3.x 3 3
4.x 4 4
5.x 5 5
6.x 6 6
OUTPUT
FREQUENCY=180kHz
(XC9301/XC9302Axx2Mx)
MARK
FREQUENCY=300kHz
(XC9301/XC9302Axx3Mx)
0.x 0 A
1.x 1 B
2.x 2 C
3.x 3 D
4.x 4 E
5.x 5 F
6.x 6 H
7.x 7 K
8.x 8 L
9.x 9 M
XC9301/XC9302
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 datasheet 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 datasheet.
3. Please ensure suitable shipping controls (including fail-safe designs and aging
protection) are in force for equipment employing products listed in this datasheet.
4. The products in this datasheet 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 datasheet 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 datasheet may be copied or reproduced without the
prior permission of TOREX SEMICONDUCTOR LTD.
13/13
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