R1272 Series
34V Input PWM/VFM Step-down DC/DC Controller with PLL Synchronization
R1272 Series
34V Input PWM/VFM Step-down DC/DC Controller with PLL Synchronization
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Description
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.
Spec
Standard | Industrial | Automotive | |
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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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Functional Description
TSD | Thermal Shutdown Function |
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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 |
Technical Documents
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Typical Application (at 1MHz)
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Efficiency vs. Output Current
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Related Links
Quality & Packages
- Refer to the datasheets for the details on the product.
- The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
FAQ
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R1272 Series