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
TOREX [ TOREX SEMICONDUCTOR ]
