XC6365/XC6366
Series
PWM Controlled, PWM/PFM Switchable Step-Down DC/DC Converters
ETR0501_003
☆GreenOperation-Compatible
■GENERAL
DESCRIPTION
The XC6365/XC6366 series are multi-functional step-down DC/DC converters with built-in high speed, low ON resistance
drivers. An output current of more than 1A is possible using an externally connected transistor, coil, diode and capacitor.
Output voltage is programmable in 0.1V increments between 1.5V to 6.0V (V
OUT
) (±2.5% accuracy). Further, with 1.0V of
standard voltage supply internal and using externally connected components, output voltage can be set up freely (FB). With
a 300kHz switching frequency, the size of the external components can be reduced.
Control switches from PWM to PFM during light loads with the XC6366 (PWM/PFM switchable) and the series is highly
efficient from light loads to large output currents.
In relation to soft-start time, both internally set-up 10ms types (A, B) and external resistor or capacitor regulated types (C, D)
are available.
During stand-by time (CE pin "Low" ), current consumption is reduced to less than 0.5μA.
With UVLO internal, the external transistor will be forcibly switched off if used below the stipulated voltage.
■APPLICATIONS
●Electronic
information organizers
●Palmtops
●Cellular
and portable phones
●Portable
audio systems
●Various
multi-function power supplies
■FEATURES
Input Voltage Range
: 2.2V ~ 10V (V
OUT
type)
Output Voltage Range
: 1.5V ~ 6.0V programmable in
0.1V increments (±2.5%)
Oscillation Frequency
: 300kHz (±15%)
: Custom products for 180, 500kHz
Output Current
High Efficiency
: More than 1.0A
(V
IN
=5.0V, V
OUT
=3.0V)
: 92% (TYP.)
Stand-by Capability
: ISTB=0.5μA (MAX.)
Soft-start time set-up externally type possible
Internally set-up output voltage type possible (V
OUT
)
Externally set-up output voltage type possible (FB)
Maximum Duty Ratio
: 100%
PWM/PFM Switching Control (XC6366)
Package
: SOT-25, USP-6C
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
1/24
XC6365/XC6366
Series
■PIN
CONFIGURATION
*The dissipation pad of the USP-6C package
should be left open. If the circuit needs to be
connected to other pin, it should be connected to
the V
DD
(No.2) pin.
■PIN
ASSIGNMENT
PIN NUMBER
SOT-25
1
2
3
4
5
USP-6
3
2
1
6
4
5
PIN NAME
EXT/
V
DD
GND
CE
V
OUT
(FB)
NC
FUNCTION
External Transistor Connection
Power Supply
Ground
Chip Enable Soft-Start Capacitor Connection
with Soft-Start Externally Set-Up Types (C, D)
Output Voltage Monitor FB with Externally
Set-Up Types (B, D)
No Connection
-
■PRODUCT
CLASSIFICATION
●Selection
Guide
2/24
XC6365/XC6366
Series
■PRODUCT
CLASSIFICATION (Continued)
●Ordering
Information
XC6365①②③④⑤⑥
XC6366①②③④⑤⑥
DESIGNATOR
PWM control
PWM/PFM switching control
DESCRIPTION
SYMBOL
A
①
Type of DC/DC Converter
B
C
D
② ③
Output Voltage
15∼60
10
3
④
Oscillation Frequency
5
2
⑤
⑥
Package
Device Orientation
M
E
R
L
DESCRIPTION
: V
OUT
type: Internally set-up, soft-start internally set-up
: FB type: Externally set-up, soft-start internally set-up
: V
OUT
type: Internally set-up, soft-start externally set-up
: FB type: Externally set-up, soft-start internally set-up
: V
OUT
type: 3.0V output
→ ②=3, ③=0
: FB type: 10 fixed
→ ②=1, ③=0
fixed
: 300kHz
: 500kHz (custom)
: 180kHz (custom)
: SOT-25 (SOT-23-5)
: USP-6C
: Embossed tape, standard feed
: Embossed tape, reverse feed
3/24
XC6365/XC6366
Series
■BLOCK
DIAGRAMS
XC6365, XC6366 Series A, C type (V
OUT
)
XC6365, XC6366 Series B, D type (FB)
4/24
XC6365/XC6366
Series
■ABSOLUTE
MAXIMUM RATINGS
Ta = 25℃
PARAMETER
V
IN
Pin Voltage
V
OUT
Pin Voltage
FB Pin Voltage
CE Pin Voltage
EXT/ Pin Voltage
EXT/ Pin Current
SOT-25
Power Dissipation
USP-6C
Operating Temperature Range
Storage Temperature Range
Note: Voltage is all ground standardized.
SYMBOL
V
DD
V
OUT
V
FB
V
CE
V
EXT/
IEXT/
Pd
Topr
Tstg
RATINGS
-0.3 ~ +12
-0.3 ~ V
IN
+0.3
-0.3 ~ V
IN
+0.3
-0.3 ~ V
IN
+0.3
-0.3 ~ V
IN
+0.3
±100
150
100
-30 ~ +80
-40 ~ +125
UNITS
V
V
V
V
V
mA
mW
℃
℃
■ELECTRICAL
CHARACTERISTICS
XC6365A333MR, XC6366A333MR
PARAMETER
Output Voltage
Maximum Input Voltage
UVLO Voltage
(Minimum Operating
Voltage)
Supply Current 1
Supply Current 2
Stand-by Current
Oscillation Frequency
Maximum Duty Ratio
PFM Duty Ratio
CE "High" Voltage
CE "Low" Voltage
EXT "High" ON Resistance
EXT "Low" ON Resistance
Efficiency
Soft-Start Time
SYMBOL
V
OUT
V
IN
V
UVLO
I
DD1
I
DD2
ISTB
f
OSC
MAXDTY
PFMDTY
V
CEH
V
CEL
R
EXTBH
R
EXTBL
EFFI
t
SS
(V
OUT
=3.3V,
CONDITIONS
f
OSC
=300kHz)
MIN.
3.218
10.0
0.9
-
-
-
-
255
100
15
0.65
-
-
-
-
5
TYP.
3.300
-
-
57
57
15
-
300
-
25
-
-
16
14
92
10
Ta=25℃
MAX. UNITS
3.383
V
-
V
2.2
102
102
27
0.5
345
-
35
-
0.20
22
19
-
20
V
μA
μA
μA
μA
kHz
%
%
V
V
μA
μA
%
ms
Same as I
DD1
,
Voltage which EXT/pin voltage holding “H” level
No external components, CE=V
DD
, V
OUT
=0V
No external components,
XC6365
CE=V
OUT
=V
DD
XC6366
No external components, CE=V
OUT
=0V
Measuring of EXT/ waveform,
V
IN
=output voltage + 0.1V
No load (XC6366 only)
No external components, V
OUT
=0V,
Voltage which EXT/pin voltage holding “L” level
No external components, V
OUT
=0V,
Voltage which EXT/pin voltage holding “H” level
Same as I
DD2
, V
EXT/=
V
DD
-0.4V
Same as I
DD1
, V
EXT/=
0.4V
Use of a XP162A12A6 transistor
recommended
Connect R
SS
, C
SS
, CE, 0V→ 3.0V
(When V
IN
≦3.0V,
V
IN
=3.0V)
Conditions: 1. Unless otherwise stated, connect external components. V
IN
=V
DD
= 5.0V, I
OUT
= 220mA
2. XC6365/66C series external components: C
SS
=0.033μF, R
SS
=470kΩ
5/24
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