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R1270 Series
3A 34V Input PWM/VFM Step-down DC/DC Converter with PLL Synchronization
The R1270 Series are 34V input (Absolute maximum rating: 36V), CMOS-based PWM/VFM step-down DC/DC converters capable of outputting the maximum 3A* current. The R1270 is selectable from two control types - PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. The R1270 includes a soft start circuit, a fold-back protection circuit and a latch protection circuit (only A Version). By simply using an inductor, resistors, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The R1270 can be synchronized externally by PLL.
*) This is an approximate value, because output current depending on conditions and external parts.
Specs & Datasheets
| Consumer | Industrial | Automotive | |
|---|---|---|---|
| Input Voltage Range | 3.6 V to 34.0 V (36.0 V) | ||
| Operating Temperature Range | -40°C to 105°C (125°C) | -40°C to 125°C (150°C) | -40°C to 125°C (150°C) |
| Supply Current | Typ. 18 µA | ||
| Standby Current | Typ. 0 µA | ||
| Output Voltage Range | Externally Adjustable: 0.8 V to 31.6 V | ||
| Feedback Voltage | 0.8 V | ||
| Feedback Voltage Accuracy | ±8 mV | ||
| Feedback Voltage Temperature Coefficient | Typ. ±100 ppm/°C (−40°C ≤ Ta ≤ 125°C) | ||
| Output Current | 3 A | ||
| Oscillator Frequency | Externally Adjustable: 300 kHz to 2.4 MHz | ||
| Maximum Duty Cycle | Min. 93% (fosc = 300 kHz), Min. 67% (fosc = 2.4 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
* PLLREF pin must not be “OPEN”. When using the Ricoh’s evaluation board, a pull-down resistor (RPLLREF2: 100 kΩ) is contained on the evaluation board.
Efficiency vs. Output Current
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1270S001x-E2-FE |
|
HSOP-18 | R1270S | R1270S-FE |
| R1270S001x-E2-YE |
|
HSOP-18 | R1270S | R1270S-YE |
| R1270S001x-E2-KE |
|
HSOP-18 | R1270S | R1270S-KE |
| R1270S001x-E2-AE |
|
HSOP-18 | R1270S | R1270S-AE |
C
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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 |