04S_02XC6367/68 02.09.12 14:41 ページ 407
Series
PWM Controlled, PWM/PFM Switchable Step‐Up DC/DC Controllers
ꢁInput Voltage Range : 0.9~10.0V
■Applications
ꢀElectronic Information Organizers
ꢁOutput Voltage Range: 1.5~6.5V(±±.5ꢀ%
ꢁOscillator Frequency : 300kHz(±15ꢀ%
ꢁPWM/PFM Switching Control (XC6368%
ꢀPalmtops
ꢀCellular and portable phones
ꢀPortable Audio Systems
ꢀVarious Multi-function Power Supplies
ꢁHigh Efficiency
ꢁSOT-±5 Package
: 84ꢀ (typ.%
4
■General Description
■Features
The XC6367/68 series are multi-functional step-up DC/DC converter
controllers with built-in high speed, low ON resistance drivers.
Large output currents are possible using an externally connected
transistor, coil, diode and condenser.
Input voltage range
: 0.9V~10V
Operating voltage range : ±.0V~10V
Output voltage range
Oscillator frequency
: 1.5V~6.5V programmable in 0.1V
steps (±±.5ꢀ%
Output voltage is selectable in 0.1 steps within a 1.5V ~ 6.5V range
(±±.5ꢀ%. ꢁor output voltages outside this range, we recommend this ꢁF
version, which has a 1.0V internal reference voltage. Using this version,
the required output voltage can be set-up using ± external resistors.
With a 300kHz switching frequency, the size of the external components
can be reduced.
: 300, 100kHz (±15ꢀ%
Custom products for 180, 500kHz
: ±00mA + (VIN=1.8V, VOUT=3.3V%
: 84ꢀ (typ.%
Output Current
High Efficiency
Stand-by capability
Selection
: ISTF=0.5A (max.%
: Soft start set-up external
Output Voltage set-up internal (VOUT%
Output Voltage set-up external (ꢁF%
: SOT-±5
Control switches from PWM to PꢁM during light loads with the XC6368
(PWM/PꢁM switchable% and the series is highly efficient from light loads
to large output currents.
Package
Soft start time of XC6367/68A, F, and C series is internally set to
10msec and XC6367/68C, D, and ꢁ series regulate soft start time by
connecting resistors and capacitors exteranally.
During stand-by time (CE pin "Low"%, current consumption is reduced to
less than 0.5µA.
■Typical Application Circuit
■Typical Performance
Characteristic
SD
VOUT
XC6368A333MR (300kHz,3.3V)
L
L=22μH(CR54), CL=94μF(Tantalum)
SD:MA737, Tr:XP161A1355P
VDD
EXT
CE
100
80
60
40
20
0
2.7V
Tr
RL
CL�
(Tantalum)�
VOUT
VIN
CIN
GND
1.8V
1.2V 1.5V
VIN=0.9V
0.1
1
10
100
1000
Output Current:IOUT (mA)
407