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R1272 Series
34V Input PWM/VFM Step-down DC/DC Controller with PLL Synchronization
The R1272 is a step-down DC/DC controller with synchronous rectifier and 34V input voltage. By the adoption of a unique current mode PWM architecture without an external current sense resistor, the R1272 can make up a stable DC/DC converter with high-efficiency even if adding low Ron MOSFETs and a low DCR inductor externally. In PLL_PWM mode, oscillator frequency is synchronized to an external clock frequency using a PLL and is effective for EMI control. For EMI reduction, SSCG (Spread-Spectrum Clock Generation) for diffused oscillation frequency at the PWM operation is optionally available.
Specs & Datasheets
| Consumer | Industrial | Automotive | |
|---|---|---|---|
| Input Voltage Range | 4.0 V to 34.0 V (36.0 V) | ||
| Operating Temperature Range | -40°C to 105°C (125°C) | -40°C to 105°C (125°C) | -40°C to 125°C (150°C) |
| Supply Current | Typ. 15 µA | ||
| Standby Current | Typ. 3 µA | ||
| Start-up Voltage | 4.5 V | ||
| Output Voltage Range | Externally Adjustable: 0.7 V to 5.3 V | ||
| Feedback Voltage | 0.64 V | ||
| Feedback Voltage Accuracy | ±1% | ||
| Oscillator Frequency | Externally Adjustable: 250 kHz to 1 MHz | ||
| Package | HSOP-18 | ||
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
Typical Application (at 1MHz)
Efficiency vs. Output Current
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1272SxxxA-E2-FE |
|
HSOP-18 | R1272S | R1272S-FE |
| R1272SxxxA-E2-YE |
|
HSOP-18 | R1272S | R1272S-YE |
| R1272SxxxA-E2-KE |
|
HSOP-18 | R1272S | R1272S-KE |
| R1272SxxxA-E2-AE |
|
HSOP-18 | R1272S | R1272S-AE |
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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Please contact us or our distributors for unpublished reliability information.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 |