XC9133B02AMR-G Torex Semiconductor Ltd, XC9133B02AMR-G Datasheet - Page 6

• 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

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■OPERATIONAL EXPLANATIONS (Continued)
■NOTES ON USE
<Lx (Pin 1): Switch Pin>
Please connect the anode of a Schottky barrier diode and an inductor to the Lx pin.
<FB (Pin 3): Voltage Feedback Pin>
The reference voltage is 200mV (TYP.). A resistor (R
LEDs and a constant current value. The resistance value can be calculated by the following equation.
<CE (Pin 4): Chip Enable Pin>
An ENABLED state is reached when the CE voltage exceeds 0.65V and a DISABLED state when the CE Voltage falls below
0.2V.
<V
Please connect an inductor and an input by-pass capacitor (C
<Current Limit>
The current limit circuit of the XC9133 series monitors the current flowing through the N-channel MOS driver transistor
connected to the Lx pin, and features a combination of the constant-current type current limit mode and the duty cycle limit
of the next pulse.
<Lx Overvoltage Limit Circuit>
XC9133 series' Lx overvoltage limit circuit monitors the Lx pin voltage. When the Lx pin voltage exceeds than 19V (TYP.),
the IC performs the function of latching the OFF state of the driver transistor, and goes into operation suspension mode.
In suspension mode, operations can be resumed by restoring power to the V
a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation.
<Maximum Duty Cycle Limit>
The XC9133 series' maximum duty cycle limit circuit monitors the duty cycle. When the maximum duty cycle is repeated
for a certain time, the IC controls the error amplifier output so that the duty cycle of the next pulse becomes smaller than
that of the first pulse.
<CE Pin Function>
The operation of the XC9133 series will enter into the shut down mode when a low level signal is input to the CE pin.
During the shut down mode, the supply current is 0μA (TYP.), with high impedance at the Lx pin. The IC starts its
operation with a high level signal to the CE pin. The input to the CE/MODE pin is a CMOS input and the sink current is 0
μA (TYP.). 100μs after disable, the IC goes into suspension mode and supply current is minimal. After this, the IC will
be in stand-by mode and the supply current will be 0μA (TYP.).
XC9133
R
I
LED
IN
LED
Typical example:
1When the driver current is greater than a specific levels, the constant-current type current limit function operates to
2The IC controls the next pulse to be smaller than the first pulse.
(Pin 5): Power Supply Pin>
=Setting
turn off the pulses from the Lx pin at any given timing.
=0.2 / I
LED
10mA
constant current value
5mA
I
LED
Series
The current will be off when the coil current
reached the value of the constant current limit.
Current Limit
40Ω
20Ω
R
LED
LED
) should be connected to the FB pin for setting the cathode of
IN
) to the V
13.3mA
IN
20mA
I
LED
pin.
Limit some duty pulses after the limit.
IN
Current Limit
pin. The suspension mode does not mean
15Ω
10Ω
R
LED