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R1276 Series
3A 30V Input Step-down DC/DC Converter with Synchronous Rectifier
The R1276 is a 36-V rated synchronous step-down DC/DC converter with built-in transistor. Under cranking condition, the switching frequency is automatically reduced to keep output voltage level constant.
- High efficiency of 95%
- Maintains the output voltage constant at cranking by reducing a switching frequency to the minimum 1/4.
- Achieves the EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +10%).
Specs & Datasheets
| Consumer | Industrial | Automotive | |
|---|---|---|---|
| Input Voltage Range | 3.6 V to 30.0 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. 12 µA (VFM, at no switching) | ||
| Standby Current | Typ. 4 µA | ||
| Start-up Voltage | 4.5 V | ||
| Output Voltage Range | Externally Adjustable: 0.7 V to 6.5 V | ||
| Feedback Voltage | 0.64 V | ||
| Feedback Voltage Accuracy | ±1.0% | ||
| Output Current | 3 A | ||
| Driver ON-resistance | High-side: Typ. 0.145 Ω Low-side: Typ. 0.095 Ω |
||
| Oscillator Frequency | 250 kHz to 1 MHz (Settable with external resistors)*1 | ||
| Efficiency | 95% | ||
| Package | HSOP-18 | ||
- *1: In the case of 0.7 V ≤ VOUT < 3.3 V, the configurable range is 250 kHz ≤ fOSC ≤ 600 kHz.
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
Efficiency Characteristics (VOUT = 5V)
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1276Sxxxx-E2-FE |
|
HSOP-18 | R1276S | R1276S-FE |
| R1276Sxxxx-E2-YE |
|
HSOP-18 | R1276S | R1276S-YE |
| R1276Sxxxx-E2-AE |
|
HSOP-18 | R1276S | R1276S-AE |
| R1276Sxxxx-E2-KE |
|
HSOP-18 | R1276S | R1276S-KE |
C
P
I
A
1
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Please contact us or our distributors for unpublished reliability information.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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Buy, Request for Samples, Request for Information Materials
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 |