MB39A103 Datasheet, PDF (2/4 Pages) List of Unclassifed Manufacturers – 4-Channel DC/DC Converter IC with Support for Low Voltage

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MB39A103
■ Reference voltage: 2.0Vʶ1%
■ Error amplifier threshold voltage: 1.24Vʶ1.5%
■ Built-in totem pole type output for MOS FET
■ Built-in load independent soft-start circuit
■ High frequency operation possible: 1MHz (Max.)
■ Short-circuit detection from external input is possible
with -INS terminal
■ Package: TSSOP-30P/BCC-32P
Circuit Configuration
Fig. 1 and 2 show the pin assignments, and Fig. 3 shows
the block diagram.
This product consists of function blocks described in the
following section.
DC/DC Converter Function
Reference Voltage Block (Ref)
The reference voltage circuit generates a temperature _ʕ
compensated reference voltage (2.0V Typ.) using the voltage
supplied from power supply terminal, and it is used as the
reference voltage for the IC's internal circuit.
In addition, the reference voltage can be used to supply a
load current of up to 1mA to an external device via the
VREF terminal.
Triangular Wave Oscillator Block (OSC)
A triangular wave form with amplitude 0.4V to 0.9V is
generated from CT terminal by connecting capacitor and
resistor for timing on CT and RT terminals respectively.
The triangular wave oscillation waveform is input to the
PWM comparator in the IC.
Error Amplifier Block (Error Amp)
The error amplifier is an amplifier which detects the
DC/DC converter output voltage and outputs the PWM
control signal. Since optional loop gain can be specified through
connection of feedback resistor and capacitor to the inverted
input terminal from output terminal of the error amplifier, a
Figure 1 Pin Assignments (TSSOP-30P)
Figure 2 Pin Assignments (BCC-32P)
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92 FIND Vol.20 No.2 2002