XC9110/XC9111Series
ETR0406 004
PFM Controlled Step-Up DC/DC Converter / Controller ICs
■GENERAL DESCRIPTION
The XC9110/9111 series is a group of PFM controlled step-up DC/DC converter/controller ICs designed to generate low supply
voltage by the combination of PFM control and CMOS structure. The series is ideal for applications where a longer battery life is
needed such as in portable communication equipment. With a built-in 2.5ΩN-channel driver transistor, the XC9110A/C/E and
XC9111A/C/E types provide a step-up operation by using only a coil, a capacitor, and a diode connected externally.
The XC9110/9111B, D and F versions can be used with an external transistor for applications requiring larger currents.
Output voltage is internally programmable in a range from 1.5V to 7.0V in increments of 100mV (accuracy:±2.5%).
Maximum oscillation frequency is set to 100kHz for XC9110/9111 series. (At light loads, it is set to 180kHz for the XC9111
series.) Options include products equipped with a CE pin (C and D versions) that allows the IC to be shut down thereby
reducing supply current and with separated VDD/VOUT pins (E and F versions) to separate the power supply block and the
output voltage detect block. With the XC9110 series, maximum duty cycle is set to 75% (VDD=3.3V) making it suitable for
use with large current operations. The XC9111 series automatically switches duty ratio between 56% & 75% (VDD=3.3V)
when it senses changes in load to drop output ripple voltage and can support both large and small currents. The external
transistor types (B/D/F types) can be provided for applications, which require larger currents
.
■FEATURES
■APPLICATIONS
Operating (Input) Voltage Range : 0.9V ~ 10.0V
●Mobile phones
Output Voltage Range
: 1.5V~7.0V
(100mV increments,
accuracy ±2.5%)
Maximum Oscillation Frequency
: 100kHz (accuracy ±15%)
●Various palm top equipment
●Cameras, VCRs
●Various portable equipment
180kHz (for the XC9111 series,
duty ratio: 56% at light loads)
Built-in Switching N-ch Transistor
: A/C/E type
ON Resistance 2.5Ω
(VDD=3.0V)
External Transistor Types
Lx Limit Voltage
: B/D/F type
: E type: more than VDD=2.0V
: A/C type: more than VOUT=2.0V
: 2.0μA
(When operating, VOUT=3V)
: SOT-23 & SOT89
(for XC9111 series),
SOT-25, USP-6C
Low Supply Current
Small Package
■TYPICAL PERFORMANCE
■TYPICAL APPLICATION CIRCUIT
●C type circuit
CHARACTERISTICS
XC9111E331MR
L=100μH(CR54), CL47μF(Tantalum)
SD: XB01SB04A2BR
100
5
4
L
80
(TOP VIEW)
SOT-25
3.0V
2.4V
60
CIN
VIN
+
2
3
1
1.5V
VOUT
40
1.2V
+
VIN=0.9V
SD
CL
(Tantalum)
20
0
GND
0
5 0
100
150
200
250
300
CE
Output Current:IOUT(mA)
1/35