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XC9301/XC9302 Series
ETR0601_001
PWM,PWM/PFM Switching Step-Up & Down DC/DC Converter Controller ICs
GO-Compatible
GENERAL DESCRIPTION
The XC9301/02 series are step-up/down DC/DC converter 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 basic external components transistors, coils, diodes and capacitors. Output voltage is selectable in 100mV 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 10msec which offers protection against rush currents when the power is switched on and also against voltage overshoot. During shutdown (CE pin = L), consumption current can be reduced to as little as 0.5A or less.
APPLICATIONS
Mobile phones PDAs Palmtop computers Portable audio equipment Various power supplies
FEATURES
Input Voltage Range : 2.0V ~ 10V (selectable in 100mV increments) Oscillation Frequency : 180KHz, 300KHz (15% accuracy) Output Current Efficiency Stand-By Maximum Duty Ratio Package : more than 250mA (VIN=2.4V, VOUT=3.3V) : 81%(TYP.) @ VOUT=5.0V, 78%(TYP.) @ VOUT=3.3V : ISTB = 0.5A (MAX.) : 85%(TYP.) : SOT-25 Output Voltage Range : 2.4V ~ 6.0V (2.5% accuracy)
PWM/PFM Switching Step-Up & Down Control (XC9302) Output Voltage Internal Set-Up
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
100
Efficiency:EFFI%
80
60 VIN=2V 40 4V 20 6V
0 0.1 1 10 100 1000
Output Current:I UTmA O
1/13
XC9301/XC9302 Series
PIN CONFIGURATION PIN ASSIGNMENT
PIN NUMBER PIN NAME 1 2 3 4 5 GND VDD EXT/ VOUT CE FUNCTION Ground Power Supply External Tr. Drive Output Voltage Monitor Chip Enable
PRODUCT CLASSIFICATION
Ordering Information
XC9301 : PWM control XC9302 : PWM/PFM switching control
DESIGNATOR
DESCRIPTION Standard Output Voltage
SYMBOL A 20~60 2 : Fixed
DESCRIPTION
: e.g. VOUT=3.0V=3, =0, VOUT=5.3V=5, =3 : 180kHz : 300kHz : SOT-25 : Embossed tape, standard feed : Embossed tape, reverse feed
Oscillation Frequency 3

Package Device Orientation
M R L
2/13
XC9301/XC9302
Series
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Ta = 25
PARAMETER VDD Pin Voltage VOUT Pin Voltage CE Pin Voltage EXT/ Pin Voltage EXT/ Pin Current Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL VDD VOUT VCE VEXT/ IEXT/ Pd Topr Tstg RATINGS -0.312.0 -0.312.0 -0.312.0 -0.3VDD+0.3 100 150 -40+85 -40+125 UNITS V V V V mA mW
3/13
XC9301/XC9302 Series
ELECTRICAL CHARACTERISTICS
XC9301x332MR, XC9302x332MR PARAMETER SYMBOL Output Voltage VOUT Supply Voltage VDD Supply Current 1 IDD1 Supply Current 2 IDD2 Stand-By Current Oscillation Frequency Maximum Duty Ratio PFM Duty Ratio Efficiency
(*2) (*1)
ISTB FOSC MAXDTY PFMDTY EFFI TSS VCEH VCEL REXTBH REXTBL
Soft-Start Time CE 'H' Voltage CE 'L' Voltage EXT/ 'H' ON Resistance EXT/ 'L' ON Resistance
(VOUT=3.3V, FOSC=180kHz) CONDITIONS MIN. TYP. 3.218 3.300 2.0 VOUT=CE: Setting output voltage x 0.95 applied 80 VOUT=CE: Setting output voltage + 0.5 applied 15 VOUT: Setting output voltage x 0.95 applied, CE=0V VDD=VOUT=CE: 153 180 Setting output voltage x 0.95 applied VDD=VOUT=CE: 78 85 Setting output voltage x 0.95 applied No Load 15 25 VDD=VIN=CE: 78 Setting output voltage x 0.95 applied 5.0 10.0 VOUT: Setting output voltage x 0.95 applied 0.65 VOUT: Setting output voltage x 0.95 applied Same as IDD1, VEXT/ = VOUT - 0.4V 29 Same as IDD1, VEXT/ = 0.4V 19
Ta=25 MAX. UNITS 3.383 V 10.0 V 140 A 26 A 0.5 207 92 35 20.0 0.20 43 27 A kHz % % % ms V V
Test Conditions: Unless otherwise stated, VDD = 3.3V, IOUT = 130mA NOTE: *1: XC9302 series only *2: EFFI={[(output voltage) x (output current)] / [(input voltage) x (input current)]} x 100
XC9301x333MR, XC9302x333MR PARAMETER SYMBOL Output Voltage VOUT Supply Voltage VDD Supply Current 1 IDD1 Supply Current 2 IDD2 Stand-By Current Oscillation Frequency Max. Duty Ratio PFM Duty Ratio (*2) Efficiency
(*1)
ISTB FOSC MAXDTY PFMDTY EFFI TSS VCEH VCEL REXTBH REXTBL
Soft-Start Time CE 'H' Voltage CE 'L' Voltage EXT/ 'H' ON Resistance EXT/ 'L' ON Resistance
(VOUT=3.3V, FOSC=300kHz) CONDITIONS MIN. 3.218 2.0 VOUT=CE: Setting output voltage x 0.95 applied VOUT=CE: Setting output voltage + 0.5 applied VOUT: Setting output voltage x 0.95 applied, CE=0V VDD=VOUT=CE: 255 Setting output voltage x 0.95 applied VDD=VOUT=CE: 78 Setting output voltage x 0.95 applied No Load 15 VDD=VIN=CE: Setting output voltage x 0.95 applied 5.0 VOUT: Setting output voltage x 0.95 applied 0.65 VOUT: Setting output voltage x 0.95 applied Same as IDD1, VEXT/ = VOUT - 0.4V Same as IDD1, VEXT/ = 0.4V -
TYP. 3.300 130 20 300 85 25 78 10.0 29 19
MAX. 3.383 10.0 200 35 0.5 345 92 35 20.0 0.20 43 27
Ta=25 UNITS V V A A A kHz % % % ms V V
Test Conditions: Unless otherwise stated, VDD = 3.3V, IOUT = 130mA NOTE: *1: XC9302 series only *2: EFFI={[(output voltage) x (output current)] / [(input voltage) x (input current)]} x 100
TYPICAL APPLICATION CIRCUIT
External Components PSW: XP162A12 (SOT-89, TOREX) NSW: XP161A12 (SOT-89, TOREX) L : 22H (CR54, SUMIDA) SD : U2FWJ44N ( Schottky, TOSHIBA ) CL : 16V, 47Fx2 (Tantalum, MCE series, NICHICON ) CIN : 16V, 22F (Tantalum, MCE series, NICHICON ) 220F (Electrolytic, NICHICON, PJ type)
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-up & step-down operations are PWM controlled. Output voltage settings are laser trimmed. P-ch MOSFET (PSW) = ON, N-ch MOSFET (NSW) = ON: Current flows from VIN via PSW, L, NSW, to GND: L is charged. P-ch MOSFET (PSW) = OFF, N-ch MOSFET (NSW) = OFF: Current flows from GND via SD1, L, SD2, to VOUT: VOUT rises 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. 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. 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). The ramp wave generator generates the switching frequency's ramp wave. With the XC9302 series, control is automatically switched between PWM and PFM according to the size of the load. 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.
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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 > 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. (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.
Input Voltage vs. Efficiency 90 85 80 75 70 65 60 55 50 45 40 2
XC6361(STEP-UP DCDC+VR) IOUT=10mA 100mA 200mA XC9301(STEP-UP/DOWN DCDC
Efficiency%
IOUT=10mA 100mA 200mA Set Output Voltage+0.4V Step-Up Mode Step-Down Mode
3
4
5
6
7
8
Input Voltage V
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 in 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)
performance of the DC/DC converter IC circuit is heavily reliant upon the performance of the surrounding circuitry and components. In particular, since the VF voltage of the Schottky Diode used will have a direct effect upon efficiency, the 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 500m or less is recommended.
The
VOUT=3.3V, IOUT=100mA 85
Efficiency%
80 75 70 65 0.2 0.4 VF VoltageV
VIN=2.4V VIN=3.0V VIN=4.5V
6/13
XC9301/XC9302
Series
OPERATIONAL EXPLANATION (Continued)
Demo Board Version 1.1
External Components Demo Board Connection Layout PSW XP162A12 (SOT-89) NSW XP161A12 (SOT-89) suitable for SOT-23, SOT-89, CPH-6 L 22H (CR54, SUMIDA) suitable for CR43CR105 SD U2FWJ44N (Schottky, TOSHIBA) suitable for MA720, MA735, U2FWJ44N CL 16V, 47Fx2 (Tantalum, MCE series, NICHICON) suitable for 1005 typeD2 Package CIN 16V, 22F (Tantalum, MCE series, NICHICON) 16V, 220F (Electrolytic, NICHICON, PJ type)
JP3: Must be connected JP2: To be connected if using SW (CE pin fixed to VIN) * Use tinned copper wire for the VIN pin, VOUT pin, GND pin, JP2, and JP3. * 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 220F, 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.)
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)
Output Current=lout (mA)
External Components PSW : XP162A12A6PR NSW : XP161A1265PR SD : U2FWJ44N L : 22H (CR54)
CL : 47F (MCE series, Tantalum) x 2 CIN : 220F (Electrolytic, PJ type) RDD : 10 CDD : 47F (MCE series, Tantalum) VCE=VIN
8/13
XC9301/XC9302
Series
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
XC9302A332 (PWM/PFM switching control, 180kHz, VOUT=3.3V) (Continued) (4) Load Transient Response (Topr=25)
VIN=3.0V
VIN=3.0V
External Components PSW : XP162A12A6PR NSW : XP161A1265PR SD : U2FWJ44N L : 22H (CR54)
CL : 47F (MCE series, Tantalum) x 2 CIN : 220F (Electrolytic, PJ type) RDD : 10 CDD : 47F (MCE series, Tantalum) VCE=VIN
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 NSW : XP161A1265PR SD : U2FWJ44N L : 22H (CR54)
CL : 47F (MCE series, Tantalum) x 2 CIN : 220F (Electrolytic, PJ type) RDD : 10 CDD : 47F (MCE series, Tantalum) VCE=VIN
10/13
XC9301/XC9302
Series
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
XC9302A502 (PWM/PFM switching control, 180kHz, VOUT=5.0V) (Continued) (4) Load Transient Response (Topr=25)
VIN=4.0V
VIN=4.0V
External Components PSW : XP162A12A6PR NSW : XP161A1265PR SD : U2FWJ44N L : 22H (CR54)
CL : 47F (MCE series Tantalum) x2 CIN : 220F (Electrolytic, PJ type) RDD : 10 CDD : 47F (MCE series Tantalum) VCE=VIN
11/13
XC9301/XC9302 Series
PACKAGING INFORMATION
SOT-25
MARKING RULE
Represents the product series
SOT-25
MARK A K
PRODUCT SERIES XC9301AxxxMx XC9302AxxxMx
5
4
Represents the integer of the output voltage and oscillation frequency OUTPUT VOLTAGE (V) 2.x 3.x 4.x 5.x 6.x MARK FREQUENCY=180kHz FREQUENCY=300kHz XC9301/XC9302Axx2Mx (XC9301/XC9302Axx3Mx) 2 3 4 5 6 2 3 4 5 6
1
2
3
Represents decimal number of output voltage and oscillation frequency OUTPUT VOLTAGE (V) 0.x 1.x 2.x 3.x 4.x 5.x 6.x 7.x 8.x 9.x MARK FREQUENCY=180kHz FREQUENCY=300kHz (XC9301/XC9302Axx2Mx) (XC9301/XC9302Axx3Mx) 0 1 2 3 4 5 6 7 8 9 A B C D E F H K L M
Represents production lot number 0 to 9, A to Z reverse character 0 to 9, A to Z repeated (G, I, J, O, Q, W excepted)
12/13
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 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.
13/13

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