XC9110 Datasheet, PDF (1/35 Pages) Torex Semiconductor – PFM Controlled Step-Up DC/DC Converter / Controller ICs

XC9110/XC9111 Series
PFM Controlled Step-Up DC/DC Converter / Controller ICs
ETR0406 004
■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.
■APPLICATIONS
●Mobile phones
●Various palm top equipment
●Cameras, VCRs
●Various portable equipment
■TYPICAL APPLICATION CIRCUIT
●C type circuit
L
VIN ₊ CIN
5
4
(TOP VIEW)
SOT-25
1
2
3
+
SD
CL
(Tantalum)
VOUT
■FEATURES
Operating (Input) Voltage Range : 0.9V ~ 10.0V
Output Voltage Range
: 1.5V~7.0V
(100mV increments,
accuracy ±2.5%)
Maximum Oscillation Frequency
: 100kHz (accuracy ±15%)
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 : B/D/F type
Lx Limit Voltage
: E type: more than VDD=2.0V
: A/C type: more than VOUT=2.0V
Low Supply Current
: 2.0μA
(When operating, VOUT=3V)
Small Package
: SOT-23 & SOT89
(for XC9111 series),
SOT-25, USP-6C
■TYPICAL PERFORMANCE
CHARACTERISTICS
XC9111E331MR
L=100μH(CR54), CL47μF(Tantalum)
SD: XB01SB04A2BR
100
80
60
1.5V
40
1.2V
VIN=0.9V
20
3.0V
2.4V
GND
CE
0
0
50
1 00
150 2 00 250 3 00
Output Current:IOUT(mA)
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