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BD9326EFJ-LBE2 Datasheet(PDF) 8 Page - Rohm

Part # BD9326EFJ-LBE2
Description  Buck Converter with Integrated FET
Download  23 Pages
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD9326EFJ-LBE2 Datasheet(HTML) 8 Page - Rohm

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BD9325FJ-LB
BD9326EFJ-LB
BD9327EFJ-LB
Application Information
1.
Block Operation
(1)
VREG
This block generates the constant-voltage needed for DC/DC boosting.
(2) VREF
This block generates the 2.9 V internal reference voltage of the Error Amp.
(3) TSD/UVLO
TSD (Thermal shutdown)/UVLO (Under Voltage Lockout) are protection circuit blocks. This circuit protects the device
from damages due to excessive heat and power dissipation. When the TSD circuit is triggered by temperature
exceeding the 175°C Maximum Junction Temperature, it shuts down the device. Once temperature falls below the
threshold set by a hysteresis, the device resumes operation.
UVLO circuit prevents error in the device operation due to either excessive or insufficient power supply voltage. It
monitors the voltage level at VIN pin and also the output of REG block. Once VIN voltage falls below 4.4V, the UVLO
circuit disables the device and resets the Soft-Start circuit. Typical UVLO Hysteresis is 100 mV.
(4) Error Amp Block (ERR)
This circuit compares the reference voltage and the feedback of output voltage. The COMP pin voltage, which is the
output of ERR block, determines the switching duty. During startup, the COMP pin voltage is limited by SS pin voltage
since the soft start is operated by the SS pin voltage.
(5) Oscillator Block (OSC)
This block generates the internal oscillating frequency of the IC.
(6) SLOPE Block
This circuit is used to generate triangular waveform from the clock created by OSC block. This triangular waveform is
sent to the PWM comparator.
(7) PWM Block
The COMP pin voltage, which is the output of ERR block, is compared to the SLOPE block's triangular waveform to
determine the switching duty. Since the switching duty is limited by the maximum duty ratio which is determined
internally, it does not become 100%.
(8) DRV Block
This circuit is a DC/DC driver block. A signal from the PWM serves as the input to drive the power FETs.
(9) OCP Block
OCP (Over-Current Protection) is a protection circuit block. The OCP block activates when the current flows through
the FET is detected, and OCP starts when it reached 2.5 / 3.5 / 4.5A (min). After OCP, switching will turn OFF and SS
capacitor will discharge. OCP is a self-recovery type (not latch).
(10)
Soft Start Circuit
The soft-start feature reduces overshoot in the output by making the regulator reach steady-state gradually. The
soft-start capacitor, CSS, which is connected to SS (pin 8) and GND (pin4), sets the soft-start time, tSS.
(Refer to Figure 23 to know how to set CSS.)
8/19
09.Sep.2014 Rev.003
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
TSZ02201-0323AAJ00440-1-2


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