PWM Controlled,PWM/PFM Switchable Stepdown DC/DC Converters
Series
577
5
General Description
Features
Applications
Typical Application Circuit
Typical Performance
Characteristic
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
2.5
A.
U.V.L.O and protection are built-in.
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
: 500mA (min.)V
IN
=3.6V, V
OUT
=3.0V
High Efficiency
: 95% (typ.)
Stand-by capability
: I
STB
=2.5
A (max.)
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
GElectronic Information Organizers
GPalmtops
GCellular and portable phones
GPortable Audio Systems
GVarious Multi-function Power Supplies
NP-Channel Power MOSFET Built-in
NMaximum Output Current : 500mA
NOutput Voltage Range
: 1.5~6.0V
NOscillator Frequency
: 300kHz
NMaximum Duty Ratio
: 100%
NHigh Efficiency
: 95%
NSOP-8 Package
0
40
20
60
80
100
0.1
1
10
100
1000
Efficiency:EFFI
%
Output Current:I
OUT
mA
XC6377A333
5.0V
V
IN
3.96V
L22HCR54
8.0V
C
L
Tantalum
C
IN
Tantalum
1
2
3
4
8
7
6
5
L
V
IN
CE/
V
OUT
SD1
Css
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XC6376/6377
Series
578
5
START
Output Voltage Internally set-up (V
OUT
)
Reset Function - Yes
Reset Function - No
Protect Circuit - Yes
Protect Circuit - Yes
Protect Circuit - No
Protect Circuit - No
Protect Circuit - Yes
Protect Circuit - No
Output Voltage Externally set-up (FB)
XC6376E,XC6377E
XC6376F,XC6377F
XC6376A,XC6377A
XC6376C,XC6377C
XC6376B,XC6377B
XC6376D,XC6377D
Pin Configuration
Pin Assignment
Product Classification
GSelection Guide
PIN
NUMBER
PIN
NAME
FUNCTION
1
3
2
V
IN
P_BST
EXT/2
Power supply input
P-ch gate boost
External drive pin 2
("L" when Pch MOSFET ON)
4
6
5
CE
GND
V
OUT
(FB)
Chip enable
Soft-start capacitor connection
Ground
Output voltage monitor
(FB=externally set-up type)
External drive pin 1
("L" when P-ch MOSFET ON)
7
8
EXT/1
LX
P-ch power MOSFET switch
1
2
3
4
8
7
6
5
SOP-8
TOP VIEW
V
IN
L
X
EXT/2
EXT/1
P_BST
GND
CE
V
OUT
05S_3XC6376/77 02.09.12 15:20 578
XC6376/6377
Series
579
5
A
B
3
S
V
OUT
FB
C
D
SYMBOL
V
OUT
/FB
V
OUT
RESET FUNCTION
INTEGRAL CIRCUIT PROTECTION
V
OUT
FB
E
F
V
OUT
V
OUT
NO
-
NO
-
YES
YES
YES
YES
NO
NO
YES
NO
Output voltage e.g. 3.0V output : (
=3,
=0)
FB products (B,D types) : (
=1,
=0)
Oscillator frequency 300kHz
5
Oscillator frequency 500kHz
2
Oscillator frequency 180kHz
Package SOP-8
R
L
Embossed Tape : Standard Feed
: Reverse Feed
XC6376 Series
PWM Control
XC6376
XC6377 Series
PWM/PFM switching control
(same as XC6376 series)
XC6377
GOrdering Information
Packaging Information
GSOP-8
4.20.4
1.50.1
00.25
0.351.0
0.40.1
1.270.03
0.2
-0.1
+0.05
5.0
-0.2
+0.5
6.1
-0.3
+0.4
05S_3XC6376/77 02.09.12 15:20 579
XC6376/6377
Series
580
5
Block Diagram
Marking
XC6376, XC6377 Series A,C types (V
OUT
)
V
OUT
CE
V
IN
CE
Vref with
Soft Start,
PWM/PFM
Controller
Phase
Compensation
Protection
Ramp Wave
Generator,
OSC
Buffer,
Driver
+
-
+
-
Error Amp.
PWM
Comparator
P-ch POWER MOS
FET
L
X
EXT/1
EXT/2
P_BST
GND
XC6376, XC6377 Series B,D types (FB)
FB
CE
V
IN
CE
Vref with
Soft Start,
PWM/PFM
Controller
Phase
Compensation
Protection
Ramp Wave
Generator,
OSC
Buffer,
Driver
+
-
+
-
Error Amp.
PWM
Comparator
P-ch POWER MOS
FET
L
X
EXT/1
EXT/2
P_BST
GND
1
2
3
4
5
8
6
7
SOP-8
(TOP VIEW)
YAA
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.
qwertyui
EXXC6376A303SR
q
LOGO MARK
w
3
i
0
u
3
y
A
t
6
r
7
e
05S_3XC6376/77 02.09.12 15:20 580
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