R1234D301B-TR-F - Brand New RICOH IC Chips
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Description
The R1234D301B-TR-F is a CMOS-based PWM step-down DC/DC Converter with synchronous rectifier and low supply current. This IC consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), a PWM/VFM alternative circuit, a chip enable circuit, and a driver transistor. It is capable of easily composing a low ripple, high efficiency step-down DC/DC converter with only a few kinds of external components, or an inductor and capacitors. The output voltage of the R1234D301B-TR-F is fixed internally.
Specifications and features
- Supply Current: Typ. 230µA (R1234Dxx1A/C), Typ. 250µA (R1234Dxx1B/D)
- Standby Current: Typ. 0µA
- Input Voltage Range: 2.4V to 5.5V (ABSOLUTE MAXIMUM: 6.5V)
- Output Voltage Range: 2.2V to 3.3V (R1234Dxx1A/B), 0.8V to VIN (R1234Dxx1C/D)
- Output Voltage Accuracy: ±2.0% (R1234DxxA/B)
- Oscillator Frequency: Typ. 500kHz (R1234Dxx1A/C), Typ. 800kHz (R1234Dxx1B/D)
- Built-in Driver ON Resistance: Pch 0.4Ω, Nch 0.6Ω (VIN=3V)
- Control mode switch: MODE pin=”L”: PWN, MODE pin=”H”: VFM
- Efficiency: Typ. 90%
- Package: SON-8
- Built-in Soft-start Function: Typ. 1.5ms
- Latch-type Protection Function: Typ. 1.5ms
- Built-in Current Limit Circuit
Application Scenarios
The R1234D301B-TR-F is suitable for use as a power source for portable equipment.
Comparison
Advantages- CMOS-based PWM step-down DC/DC Converter design
- Low supply current
- Low ripple and high efficiency
- Easy to compose a step-down DC/DC converter with minimal external components
- Fixed output voltage
- Various protection circuitsDisadvantages- Output voltage for R1234D301B-TR-F is not adjustable externally
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Datasheet
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Shopping guide
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Popular parts of the same kind
- Datasheet: Download R1234D301B-TR-F
- Chipdatas Part: CD87-R1234D301B-TR-F
- Warehouse: China, Hong Kong
- Dispatch: Within 24 hours
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- Last Updated: 2024/10/01 08:56 +0800
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