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 0.5μA 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
(V
IN
=2.4V, V
OUT
=3.3V)
: 81%(TYP.) @ V
OUT
=5.0V,
78%(TYP.) @ V
OUT
=3.3V
: I
STB
= 0.5μA (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
V
IN
=2V
40
4V
20
6V
0
0.1
1
10
100
1000
Output Current:I
UT
（mA）
O
1/13
XC9301/XC9302
Series
■PIN
CONFIGURATION
■PIN
ASSIGNMENT
PIN NUMBER PIN NAME
1
2
3
4
5
GND
V
DD
EXT/
V
OUT
CE
FUNCTION
Ground
Power Supply
External Tr. Drive
Output Voltage Monitor
Chip Enable
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9301
①②③④⑤⑥:
PWM control
XC9302
①②③④⑤⑥:
PWM/PFM switching control
DESIGNATOR
①
② ③
DESCRIPTION
Standard
Output Voltage
SYMBOL
A
20~60
2
: Fixed
DESCRIPTION
: e.g. V
OUT
=3.0V→②=3,
③=0,
V
OUT
=5.3V→②=5,
③=3
: 180kHz
: 300kHz
: SOT-25
: Embossed tape, standard feed
: Embossed tape, reverse feed
④
Oscillation Frequency
3
⑤
⑥
Package
Device Orientation
M
R
L
2/13
XC9301/XC9302
Series
■BLOCK
DIAGRAM
■ABSOLUTE
MAXIMUM RATINGS
Ta = 25℃
PARAMETER
V
DD
Pin Voltage
V
OUT
Pin Voltage
CE Pin Voltage
EXT/ Pin Voltage
EXT/ Pin Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
DD
V
OUT
V
CE
V
EXT/
I
EXT/
Pd
Topr
Tstg
RATINGS
-0.3½12.0
-0.3½12.0
-0.3½12.0
-0.3½V
DD
+0.3
±100
150
-40½+85
-40½+125
UNITS
V
V
V
V
mA
mW
℃
℃
3/13
XC9301/XC9302
Series
■ELECTRICAL
CHARACTERISTICS
XC9301x332MR, XC9302x332MR
PARAMETER
SYMBOL
Output Voltage
V
OUT
Supply Voltage
V
DD
Supply Current 1
I
DD1
Supply Current 2
I
DD2
Stand-By Current
Oscillation Frequency
Maximum Duty Ratio
PFM Duty Ratio
Efficiency
(*2)
(*1)
I
STB
FOSC
MAXDTY
PFMDTY
EFFI
T
SS
V
CEH
V
CEL
R
EXTBH
R
EXTBL
Soft-Start Time
CE 'H' Voltage
CE 'L' Voltage
EXT/ 'H' ON Resistance
EXT/ 'L' ON Resistance
(V
OUT
=3.3V, FOSC=180kHz)
CONDITIONS
MIN.
TYP.
3.218
3.300
2.0
-
V
OUT
=CE: Setting output voltage × 0.95 applied
-
80
V
OUT
=CE: Setting output voltage + 0.5 applied
-
15
V
OUT
: Setting output voltage × 0.95 applied,
-
-
CE=0V
V
DD
=V
OUT
=CE:
153
180
Setting output voltage × 0.95 applied
V
DD
=V
OUT
=CE:
78
85
Setting output voltage × 0.95 applied
No Load
15
25
V
DD
=V
IN
=CE:
-
78
Setting output voltage × 0.95 applied
5.0
10.0
V
OUT
: Setting output voltage × 0.95 applied
0.65
-
V
OUT
: Setting output voltage × 0.95 applied
-
-
Same as I
DD1
, V
EXT/
= V
OUT
- 0.4V
-
29
Same as I
DD1
, V
EXT/
= 0.4V
-
19
Ta=25℃
MAX. UNITS
3.383
V
10.0
V
140
μA
26
μA
0.5
207
92
35
-
20.0
-
0.20
43
27
μA
kHz
%
%
%
ms
V
V
Ω
Ω
Test Conditions: Unless otherwise stated, V
DD
= 3.3V, I
OUT
= 130mA
NOTE: *1: XC9302 series only
*2: EFFI={[(output voltage) × (output current)] / [(input voltage) × (input current)]} × 100
XC9301x333MR, XC9302x333MR
PARAMETER
SYMBOL
Output Voltage
V
OUT
Supply Voltage
V
DD
Supply Current 1
I
DD1
Supply Current 2
I
DD2
Stand-By Current
Oscillation Frequency
Max. Duty Ratio
PFM Duty Ratio
(*2)
Efficiency
(*1)
I
STB
FOSC
MAXDTY
PFMDTY
EFFI
T
SS
V
CEH
V
CEL
R
EXTBH
R
EXTBL
Soft-Start Time
CE 'H' Voltage
CE 'L' Voltage
EXT/ 'H' ON Resistance
EXT/ 'L' ON Resistance
(V
OUT
=3.3V, FOSC=300kHz)
CONDITIONS
MIN.
3.218
2.0
V
OUT
=CE: Setting output voltage × 0.95 applied
-
V
OUT
=CE: Setting output voltage + 0.5 applied
-
V
OUT
: Setting output voltage × 0.95 applied,
-
CE=0V
V
DD
=V
OUT
=CE:
255
Setting output voltage × 0.95 applied
V
DD
=V
OUT
=CE:
78
Setting output voltage × 0.95 applied
No Load
15
V
DD
=V
IN
=CE:
-
Setting output voltage × 0.95 applied
5.0
V
OUT
: Setting output voltage × 0.95 applied
0.65
V
OUT
: Setting output voltage × 0.95 applied
-
Same as I
DD1
, V
EXT/
= V
OUT
- 0.4V
-
Same as I
DD1
, V
EXT/
= 0.4V
-
TYP.
3.300
-
130
20
-
300
85
25
78
10.0
-
-
29
19
Ta=25℃
MAX. UNITS
3.383
V
10.0
V
200
μA
35
μA
0.5
345
92
35
-
20.0
-
0.20
43
27
μA
kHz
%
%
%
ms
V
V
Ω
Ω
Test Conditions: Unless otherwise stated, V
DD
= 3.3V, I
OUT
= 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
L
: 16V, 47μF×2 (Tantalum, MCE series, NICHICON )
C
IN
: 16V, 22μF (Tantalum, MCE series, NICHICON )
220μF (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.
<ON TIME>
P-ch MOSFET (PSW) = ON, N-ch MOSFET (NSW) = ON: Current flows from V
IN
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
OUT
: V
OUT
rises
due to the charge stored at L.
By comparing V
OUT
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.
5/13
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