Series
PWM Controlled,PWM/PFM Switchable Step‐down DC/DC Converters
NP-Channel Power MOSFET Built-in
■Applications
NMaximum Output Current : 500mA
GElectronic Information Organizers
NOutput Voltage Range
: 1.5~6.0V
GPalmtops
NOscillator Frequency
: 300kHz
NMaximum Duty Ratio
: 100%
NHigh Efficiency
: 95%
GCellular and portable phones
GPortable Audio Systems
GVarious Multi-function Power Supplies
NSOP-8 Package
5
■General Description
■Features
The XC6376/77 series are step-down DC/DC converters with built-in Pchannel 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 (VOUT 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.
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.)VIN=3.6V, VOUT=3.0V
High Efficiency
: 95% (typ.)
Stand-by capability : ISTB=2.5µA (max.)
Soft-start time set-up externally type
U.V.L.O, Pch boost, VOUT reset functions available
Internally set-up output voltage type (VOUT)
Externally set-up output voltage type (FB)
Pchannel Power MOSFET built-in
Package
: SOP-8
U.V.L.O and protection are built-in.
■Typical Application Circuit
VIN
1
CIN
（Tantalum）
2
SD1
XC6377A333
7
L＝22μH
（CR54）
100
L
3
6
4
5
Css
VOUT
CL
（Tantalum）
VIN＝3.96V
Efficiency:EFFI
（%）
CE/
8
■Typical Performance
Characteristic
80
60
5.0V
8.0V
40
20
0
0.1
1
10
100
1000
Output Current:IOUT mA）
（
577
