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R1223 Series
13.2V Input PWM/VFM Step-down DC/DC Controller
The R1223 Series are CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor. By simply using a power transistor, an inductor, a diode, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control is available. The current limit protection circuit can be selected from reset type or latch type.
Specs & Datasheets
| Consumer | |
|---|---|
| Input Voltage Range | 2.3 V to 13.2 V (15.0 V) |
| Operating Temperature Range | -40°C to 85°C (125°C) |
| Supply Current | Typ. 100 µA (R1223Nxx2A/C/E/G) Typ. 140 µA (R1223Nxx2B/D/F/H) |
| Standby Current | Typ. 0 µA |
| Output Voltage Range | 1.5 V to 5.0 V (0.1 V step) |
| Output Voltage Accuracy | ±2% (Ta = 25°C) |
| Output Voltage Temperature Coefficient | Typ. ±100 ppm/°C |
| Oscillator Frequency | Typ. 300 kHz, 500 kHz |
| Efficiency | Typ. 90% |
| Package | SOT-23-5 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |
|
Technical Documents
Typical Application
L: 27µH, CIN: 10µF×2, COUT: 47µ
R1223N332A Efficiency vs. Output Current
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1223Nxx2x-TR-FE |
|
SOT-23-5 | R1223N | R1223N-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Please contact us or our distributors for unpublished reliability information.
Sample / Buy
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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 |