Series
PWM Controlled,PWM/PFM Switchable Step‐down DC/DC Converters
NP-Channel
Power MOSFET Built-in
NMaximum
Output Current : 500mA
NOutput
Voltage Range
NOscillator
Frequency
NMaximum
Duty Ratio
NHigh
Efficiency
NSOP-8
Package
: 1.5~6.0V
: 300kHz
: 100%
: 95%
■Applications
GElectronic
Information Organizers
GPalmtops
GCellular
and portable phones
GPortable
Audio Systems
GVarious
Multi-function Power Supplies
■General Description
The XC6376/77 series are step-down DC/DC converters with built-in P-
channel power MOSFETs. A highly efficient DC/DC converter with output
currents of 500mA can be realised using only four peripherals - a coil, a
diode and 2 capacitors.
Output voltage can be internally set-up in 0.1V increments (±2.5%)
between 1.5V and 6.0V (V
OUT
type). Alternatively, output voltage can be
set-up at will using a 1.0V internal reference voltage source and
peripherals (FB type). It is possible to reduce the size of the peripherals
used since the switching frequency is 300kHz.
The PWM//PFM switchable XC6377 operates in PFM mode during light
loads and is highly efficient from light loads to large output currents.
Required values for soft start time can be regulated via the external
capacitor and the stand-by function reduces supply current to less than
2.5µA.
U.V.L.O and protection are built-in.
■Features
Input voltage range
: 1.8V~10V
Output voltage range
: 1.5V~6.0V programmable in 0.1V steps
(±2.5%)
Oscillator frequency
: 300kHz (±1.5%)
: Custom products for 180, 500kHz
Max. output current
High Efficiency
Stand-by capability
: 500mA (min.)V
IN
=3.6V, V
OUT
=3.0V
: 95% (typ.)
: I
STB
=2.5µA (max.)
5
Soft-start time set-up externally type
U.V.L.O, Pch boost, V
OUT
reset functions available
Internally set-up output voltage type (V
OUT
)
Externally set-up output voltage type (FB)
Pchannel Power MOSFET built-in
Package
: SOP-8
■Typical Application Circuit
V
IN
■Typical Performance
Characteristic
XC6377A333
100
L
L＝22μH
（CR54）
1
CE/
C
IN
（Tantalum）
8
7
SD1
2
3
4
Css
5
V
OUT
Efficiency:EFFI
（%）
6
V
IN
＝3.96V
80
60
8.0V
40
20
5.0V
C
L
（Tantalum）
0
0.1
1
10
100
1000
Output Current:I
OUT
mA）
（
577
XC6376/6377
Series
■Pin Configuration
V
IN
1
EXT/2
2
P_BST
3
CE
4
SOP-8
（TOP VIEW）
■Pin Assignment
PIN
NUMBER
1
2
3
4
5
6
7
8
PIN
NAME
V
IN
EXT/2
P_BST
CE
V
OUT
(FB)
GND
EXT/1
LX
FUNCTION
Power supply input
External drive pin 2
("L" when Pch MOSFET ON)
P-ch gate boost
Chip enable
Soft-start capacitor connection
Output voltage monitor
(FB=externally set-up type)
Ground
External drive pin 1
("L" when P-ch MOSFET ON)
P-ch power MOSFET switch
8
L
X
7
EXT/1
6
GND
5
V
OUT
5
■Product Classification
GSelection
Guide
START
Output Voltage Internally set-up (V
OUT
)
Reset Function - Yes
Protect Circuit - Yes
Protect Circuit - No
Reset Function - No
Protect Circuit - Yes
Protect Circuit - No
XC6376A,XC6377A
XC6376C,XC6377C
XC6376E,XC6377E
XC6376F,XC6377F
Output Voltage Externally set-up (FB)
Protect Circuit - Yes
Protect Circuit - No
XC6376B,XC6377B
XC6376D,XC6377D
578
XC6376/6377
Series
GOrdering
Information
XC6376
①②③④⑤⑥
XC6376 Series
SYMBOL
A
B
①
PWM Control
V
OUT
/FB
V
OUT
FB
V
OUT
FB
V
OUT
V
OUT
V
OUT
RESET FUNCTION
NO
-
NO
-
YES
YES
INTEGRAL CIRCUIT PROTECTION
YES
YES
NO
NO
YES
NO
C
D
E
F
②
③
Output voltage e.g. 3.0V output : (
②
=3,
③
=0)
FB products (B,D types) : (
②
=1,
③
=0)
3
Oscillator frequency 300kHz
Oscillator frequency 500kHz
Oscillator frequency 180kHz
Package SOP-8
Embossed Tape : Standard Feed
: Reverse Feed
④
5
2
S
R
L
⑤
⑥
5
XC6377
①②③④⑤⑥
XC6377 Series
PWM/PFM switching control
(same as XC6376 series)
■Packaging Information
GSOP-8
6.1
-0.3
+0.4
4.2±0.4
1.5±0.1
+0.05
0.35∼1.0
0.2
-0.1
0∼0.25
1.27±0.03 0.4±0.1
5.0
+0.5
-0.2
579
XC6376/6377
Series
■Marking
qwertyui
EX：XC6376A303SR
LOGO MARK
q
w
7
e
6
r
A
t
3
y
0
u
3
i
1 2 3 4 5
■Block Diagram
XC6376, XC6377 Series A,C types (V
OUT
)
Y A A
SOP-8
(TOP VIEW)
6 7 8
MarkY : Year code
Represents the single digit of Dominical Year
MarkAA: Assembly Lot
Denotes the production lot number 0 to 9, A to Z repeated(G.I.J.O.Q.W excepted)
Higher order zero is not represented.
5
V
IN
V
OUT
P-ch POWER MOS
FET
L
X
Protection
Phase
Compensation
PWM
Comparator
EXT/1
+
+
CE
-
CE
Vref with
Soft Start,
Error Amp.
PWM/PFM
Controller
-
Buffer,
Driver
EXT/2
P_BST
Ramp Wave
Generator,
OSC
GND
XC6376, XC6377 Series B,D types (FB)
V
IN
FB
P-ch POWER MOS
FET
L
X
Protection
Phase
Compensation
PWM
Comparator
EXT/1
+
+
CE
-
CE
Vref with
Soft Start,
Error Amp.
PWM/PFM
Controller
-
Buffer,
Driver
EXT/2
P_BST
Ramp Wave
Generator,
OSC
GND
580
嵌入式系统
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