XC6371/XC6372/XC6373
Series
PWM Controlled Step - Up DC/DC Contorollers/Convereters
ETR0402_002
☆GO-Compatible
■GENERAL
DESCRIPTION
The XC6371/6372/6373 series are a group of PWM controlled and PWM/PFM controlled step-up DC/DC converters. The
built-in 1.4Ω switching transistor type enables a step-up circuit to be configured using only three components, a coil, a diode,
and a capacitor.
Output voltage can be selectable in the range from 2.0V to 7.0V in increments of 100mV (accuracy:±2.5%). Oscillation
frequency is also selectable from 50kHz, 100kHz, and 180kHz (accuracy:±15%) for the XC6371 and the XC6372 series.
Soft-start time is internally set and offers protection against in-rush currents when the power is switched on and prevents
voltage overshoot. 5 pin packages, which are provided with either a CE (chip enable) function that reduces power
consumption during shut-down mode, or a V
DD
pin (separated power and voltage detect pins) are available.
The XC6371 series is the standard PWM controlled products. The control of the XC6372 series switches from PWM to PFM
control during light loads when automatically switching is selected and the series is highly efficient from light loads to large
output currents. Since the XC6373 series is a low noise, it is suitable for a wireless circuit. Also the series is particularly
suited for use with pager applications because oscillation frequency is set at 30kHz (±20%) so as to attain the lowest
consumption current possible.
■APPLICATIONS
●Cellular
phones, Pagers
●Palmtops
●Cameras,
Video recorders
●Portable
products
■FEATURES
: 0.9V~10V
: 2.0V~7.0V in 100mV increments
: Setting voltage accuracy±2.5%
: 50kHz, 100kHz, 180kHz (±15%)
selectable (XC6371/72)
30kHz (XC6373)
Maximum Output Currents (Tr. built-in)
: 100mA(TYP.) @ V
IN
=3.0V, V
OUT
=5.0V *
Highly Efficient (Tr. built-in)
: 85%(TYP.) @ V
IN
=3.0V, V
OUT
=5.0V *
Built-in switching transistor type.
Five-lead packaged units offer either chip enable or
independent V
OUT
pin option.
Phase compensation and soft start-up circuits built-in.
CMOS Low Power Consumption
Small Packages
: SOT-89, SOT-89-5,USP-6B
*: Performance depends on external components and
PCB layout.
Operation Start Voltage Range
Output Voltage Range
Highly Accurate
Oscillation Frequency
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
1/19
XC6371/XC6372/XC6373
Series
■PIN
CONFIGURATION
■PIN
ASSIGNMENT
XC6371/72/73A
PIN NUMBER
SOT-89
1
2
3
－
USP-6B
6
1
4
2, 3, 5
PIN NAME
V
SS
V
OUT
Lx
NC
*The dissipation pad for the USP-6B
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 pin No.1.
FUNCTION
Ground
Output Voltage Monitor/IC Internal Power Supply
Switch
No Connection
XC6371/72/73C
PIN NUMBER
SOT-89-5
5
2
4
3
1
USP-6B
6
1
4
3
2, 5
PIN NAME
V
SS
V
OUT
Lx
CE
NC
FUNCTION
Ground
Output Voltage Monitor/IC Internal Power Supply
Switch
Chip Enable
No Connection
XC6371/72/73E
PIN NUMBER
SOT-89-5
5
2
4
3
1
USP-6B
6
1
4
3
2, 5
PIN NAME
V
SS
V
DD
Lx
V
OUT
NC
FUNCTION
Ground
IC Internal Power Supply
Switch
Output Voltage Monitor
No Connection
2/19
XC6371/XC6372/XC6373
Series
■PRODUCT
CLASSIFICATION
●Selection
Guide
START
PWM
Low Frequency PWM
XC6371
XC6373
XC6371/73A
XC6371/73C
XC6371/73E
Standard
Chip Enable
Separated
V
DD
/V
OUT
PWM/PFM
Standard
Chip Enable
Separated
V
DD
/V
OUT
XC6372A
XC6372C
XC6372E
●Ordering
Information
XC6371①②③④⑤⑥ : PWM controlled
XC6372①②③④⑤⑥ : PWM/PFM switching control
DESIGNATOR
①
DESCRIPTION
Type of
DC/DC Converter
Output Voltage
SYMBOL
A
C
E
Integer
0
1
2
P
D
R
L
DESCRIPTION
: 3-pin DC/DC converter with built-in switching transistor
: Stand-by capability with built-in switching transistor
: Separated V
DD
and V
OUT
with built-in switching transistor
: e.g. V
OUT
=3.5V→②=3,
: 50kHz
: 100kHz
: 180kHz
: SOT-89 (XC6371/72 A type)
: SOT-89-5 (XC6371/72 C/D type)
: USP-6B
: Embossed tape, standard feed
: Embossed tape, reverse feed
③=5
XC6371 Series
② ③
④
Oscillation Frequency
⑤
Package
⑥
Device Orientation
XC6373①②③④⑤⑥ : PWM controlled
DESIGNATOR
①
②
③
④
⑤
DESCRIPTION
Type of
DC/DC Converter
Output Voltage
Oscillation Frequency
Package
SYMBOL
A
C
E
Integer
0
P
D
R
L
DESCRIPTION
: 3-pin DC/DC converter with built-in switching transistor
: Stand-by capability with built-in switching transistor
: Separated V
DD
and V
OUT
with built-in switching transistor
: e.g. V
OUT
=3.5V→②=3,
: 30kHz
: SOT-89 (XC6373 A type)
: SOT-89-5 (XC6373 C/D type)
: USP-6B
: Embossed tape, standard feed
: Embossed tape, reverse feed
③=5
⑥
Device Orientation
3/19
XC6371/XC6372/XC6373
Series
■BLOCK
DIAGRAMS
XC6371/72/73A, C
(The V
OUT
pin serves also as V
DD
)
(
p
)
Soft Start
Vref
Phase comp
Lx
VLx l imi ter
Buffer
PWM Control
OSC 50/100/180KHz
V
DD
V
OUT
V
SS
EXT
+
－
Chip Enable
CE
Note: The CE pin is only used with the XC6371C.
XC6371/72/73E
V
DD
Lx
VLx l imi ter
Buffer
PWM Control
OSC 50/100/180KHz
Soft Start
Vref
Phase comp
V
DD
V
SS
V
OUT
EXT
+
－
Note: Built-in transistor type units use the Lx pin.
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
PARAMETER
V
OUT
Input Voltage
L
X
pin Voltage
L
X
pin Current
CE Input Voltage
SOT-89, 89-5
Power Dissipation
USP-6B
V
DD
Input Voltage
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
OUT
V
LX
I
LX
V
CE
P
d
V
DD
Topr
Tstg
RATINGS
12
12
400
12
500
100
12
-30~＋80
-40~＋125
UNITS
V
V
mA
V
mW
V
℃
℃
4/19
XC6371/XC6372/XC6373
Series
■ELECTRICAL
CHARACTERISTICS
V
OUT
=5.0V, FOSC=100kHZ
XC6371/72A501PR
PARAMETER
SYMBOL
CONDITIONS
Output Voltage
V
OUT
Maximum Input Voltage
V
IN
Operation Start Voltage
V
ST1
External Components Connected, I
OUT
=1mA
No external components. Apply voltage to V
OUT
Oscillation Start Voltage
V
ST2
Lx : 10kΩ pull-up to 5V
No Load Input Current
I
IN
V
IN
=V
OUT
×0.8,
I
OUT
=0mA (*1)
Same as V
ST2
,
Supply Current 1
I
DD1
Apply output voltage×0.95 to V
OUT
Same as V
ST2
,
Supply Current 2
I
DD2
Apply output voltage×1.1 to V
OUT
Lx Switch-On
R
SWON
Same as I
DD1
, V
LX
=0.4V
Resistance
Lx Leak Current
I
LXL
No external components. V
OUT
=V
LX
=10V
Oscillation Frequency
FOSC
Same as I
DD1
. Measuring of Lx waveform
Maximum Duty Ratio
MAXDTY
Same as I
DD1
. Measuring of Lx waveform
PFM Duty Ratio (*4)
PFMDTY
Same as I
DD1
. Measuring of Lx waveform
Same as I
DD1
. Apply output voltage to Lx,
Lx Limit Voltage
V
LXLMT
Voltage required to produce FOSC×2
Efficiency
EFFI
Slow-Start Time
T
SS
MIN.
4.875
10
-
-
-
-
-
-
-
85
80
10
0.7
-
4.0
TYP.
5.000
-
-
-
12.8
80.2
8.2
1.4
-
100
87
17
-
85
10.0
Ta=25℃
MAX. UNITS
5.125
V
-
V
0.90
V
0.80
25.7
133.8
16.5
2.4
1.0
115
92
25
1.3
-
20.0
V
μA
μA
μA
Ω
μA
kHz
%
%
V
%
mS
NOTE: Unless otherwise stated, V
IN
=V
OUT
×0.6,
I
OUT
=50mA. See Typical Application Circuits, Circuit1
*1: The Schottky diode (SD) must be type MA735, with reverse current (I
R
)<1.0μA at reverse voltage (V
R
)=10.0V.(XC6372A)
*2: "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically
operates which results in less average power consumption. The current actually provided by an external V
IN
source is represented by
"No Load Input Current (I
IN
)".
*3: When PWM operates at PWM Mode.
*4: When PFM operates at PFM Mode.(XC6372A)
5/19
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