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R1232 Series
PWM Step-down DC/DC Converter with Synchronous Rectifier
The R1232 Series are low supply current CMOS-based PWM step-down DC/DC converters with synchronous rectifier. R1232 includes a soft start circuit, under-voltage lockout circuit (UVLO) and latch type protection circuit. By simply using an inductor, a capacitor, and (resistors) as external components, a high-efficiency step-down DC/DC converter can be easily configured. R1232 comes in two types: R1232Dxx1A/B with internally fixed output voltage and R1232D001C/D with adjustable output voltage with external resistors.
Specs & Datasheets
| Consumer | |
|---|---|
| Input Voltage Range | 2.6 V to 5.5 V (6.5 V) |
| Operating Temperature Range | -40°C to 85°C (125°C) |
| Supply Current | Typ. 140 µA (1 MHz), 240 µA (2.25 MHz) (Non-switching) |
| Standby Current | Typ. 0 µA (CE = "L") |
| Output Voltage Range | Internally Fixed Ver.: 0.9 V to 3.3 V Externally Adjustable Ver.: 0.8 V to VIN (Feedback Voltage: 0.8V) |
| Output Voltage Accuracy | ±2% (Ta = 25°C) |
| Feedback Voltage Accuracy | ±16 mV |
| Output Current | 1 A |
| Oscillator Frequency | Typ. 1 MHz, 2.25 MHz |
| Maximum Duty Cycle | Min. 100% |
| Package | SON-8 |
Protections / Functions
| TSD | ILX | OCP | OVP | UVLO | OVLO | Reverse | Shutdown | Soft Start | SSCG | PGOOD | Auto Discharge | Anti-ringing | Sequencing | Max Duty | Ext. Phase | LED Adjust |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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|
|
|
Technical Documents
R1232Dxx1A/B Typical Application
L=4.7µH, 2.2µH
CIN=10µF, COUT=10µF
R1232D001C/D Typical Application
For VOUT=2.0V, R1=33kΩ, R2=22kΩ, Cb=100pF
R1232D331A Efficiency vs. Output Current
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1232Dxx1x-TR-FE |
|
SON-8 | R1232D | R1232D-FE |
C
Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.
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Authorized Distributors
Please contact your local distributors for any sales-related inquiry such as price, stock, delivery, etc.
Functional Description
| TSD | Thermal Shutdown Function |
|---|---|
| ILX | LX Current Limit Function |
| OCP | Overcurrent Protection |
| OVP | Overvoltage Protection |
| UVLO | Undervoltage Lockout Protection |
| OVLO | Overvoltage Lockout Protection |
| Reverse | Reverse Current Protection Circuit |
| Shutdown | Shutdown Function |
| Soft Start | Soft Start Function |
| SSCG | Spread Spectrum Clock Generator Function |
| PGOOD | Power Good Output |
| Auto Discharge | Auto Discharge Function |
| Anti-ringing | Anti-ringing Switch Function |
| Sequencing | Start-up Sequencing Control |
| Max Duty | Maximum Duty Cycle |
| Ext. Phase | Externally Adjustable Phase Compensation |
| LED Adjust | LED High-speed Dimming Control |