XC9133B02AMR-G Torex Semiconductor Ltd, XC9133B02AMR-G Datasheet - Page 5

• Manufacturer Part Number: XC9133B02AMR-G
• Description: IC BOOST ADJ .26A SOT25-5
• Manufacturer: Torex Semiconductor Ltd
• Type: Step-Up (Boost)r

Specifications of XC9133B02AMR-G

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 2.5 ~ 17.5 V
• Current - Output: 260mA
• Frequency - Switching: 1MHz
• Voltage - Input: 2.5 ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Power - Output: 250mW
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

■TYPICAL APPLICATION CIRCUITS
■OPERATIONAL EXPLANATION
●XC9133B02A
■EXTERNAL COMPONENTS
The series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase
compensation circuit, Lx overvoltage limit circuit, N-channel MOS driver transistor, current limiter circuit and others.
Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator to
determine the turn-on time during switching. The PWM comparator compares, in terms of voltage level, the signal from
the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to the N-channel MOS
driver transistor to cause the Lx pin to output a switching duty cycle. This process is continuously performed to ensure
stable output voltage. The current feedback circuit detects the N-channel MOS driver transistor's current for each
switching operation, and modulates the error amplifier output signal. This enables a stable feedback loop even when a
low ESR capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage.
<Reference Voltage Source>
The reference voltage source provides the reference voltage to ensure stable output voltage of the IC.
<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The 1MHz (TYP.) of frequency is fixed internally.
Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation.
<Error Amplifier>
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the FB pin
voltage. When a feed-back voltage becomes lower than the reference voltage, an output voltage of the error amplifier is
increased. Gain and frequency characteristics of the error amplifier output are fixed internally as an optimize signal.
NOTE:
*1: Please use a Schottky barrier diode (SBD) with a low junction capacitance.
*2: For using the XBS053V15R with four white LEDs in series, please be noted with a direct reverse voltage (V
*3: Use ceramic capacitors processing a low temperature coefficient.
SYMBOL
SBD
C
repetitive peak reverse voltage (V
C
L
L
IN
(*3)
(*1)
0.22μF
VALUE
4.7μF
22μH
-
RM
=30V).
JMK107BJ475MA-B
TMK107BJ224KA-B
VLF3010A-220MR
XBS053V15R
PART NUMBER
MA2Z720
(*2)
MANUFACTURER
TAIYO YUDEN
TAIYO YUDEN
PANASONIC
TOREX
TDK
XC9133
R
=20V) and a
Series
5/15