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XC9301/9302 Series
General Description
PWM, PWM/PFM Switching
Step-Up & Down DC/DC Controller
Features
DETAILS
The XC9301/02 series are step-up/down DC/DC converter
controller ICs with fast, low ON resistance drivers built-in. A
versatile, large output current, step-up/down DC/DC con-
verter can be realised using only 4 basic external components
- transistors, coils, diodes and capacitors.
Output voltage is selectable in 0. V steps within a 2.4V ~ 6.0V
1
( ± 2.5% accuracy) range and switching frequency is set at
180kHz.
The XC9302 series switches from PWM to PFM control during
light loads and the series offers high efficiencies from light
loads through to large output currents.
Soft-start time is internally set to 10 msec which offers pro-
tection against rush currents when the power is switched on
and also against voltage overshoot.
During shutdown (CE pin = L), consumption current can be
reduced to as little as 0.5
µ
A or less.
Input Voltage Range:
2.0V ~ 10V
Output Voltage Range:
2.4V ~ 6.0V ( ± 2.5% accuracy)
(selectable in 0. V steps)
1
Oscillation Frequency:
180KHz ( ± 15% accuracy)
Output Current:
more than 250mA (V
IN
=2.4V, V
OUT
=3.3V)
Efficiency:
81% (typ) at 5.0V
78% (typ) at 3.3V
Stand-By:
ISTB = 0.5
µ
A (max)
Output Voltage Internal Set-Up
SOT-25 Package
Pin Configuration
5
4
Pin Assignment
PIN
NUMBER
1
2
3
1
2
3
4
5
PIN
NAME
GND
V
DD
EXT/
V
OUT
CE
FUNCTION
Ground
Power Supply
External Transistor Connection
Output Voltage Monitor
Chip Enable
SOT-25
<SOT-23-5>
(TOP VIEW)
Block Diagram
V
OUT
Phase
Compensation
+
-
Buffer,
Driver
,
PWM
Comparator
GND
V
DD
Error Amp.
+
-
EXT/
CE Vref with
Soft Start,
CE
PWM/PFM
Controler
Ramp Wave
Generator,
OSC
,
Ordering Information
XC9301①②③④⑤⑥
①
②
③
④
FUNCTION
A：Standard (5-pin)
Output Voltage : 2.4 ~ 6.0
e.g. 3.0V =
② →
3,
③ →
0
Oscillator frequency
2：180kHz
FUNCTION
⑤
Package
M：SOT-25 (1reel = 3000pcs)
Embossed Tape
R：standard loading
L：reverse loading
⑥
* XC9302 Series PWM/PFM switching control (same as XC9301 series)
51
PCB设计
