LM26420 Dual 2-A, High-Efficiency Synchronous DC/DC Converter
1 Features
- Compliant with CISPR25 Class 5 Conducted Emissions
- Input Voltage Range of 3 V to 5.5 V
- Output Voltage Range of 0.8 V to 4.5 V
- 2-A Output Current per Regulator
- High Switching Frequency: 2.2 MHz (LM26420X)
0.55 MHz (LM26420Y) - 0.8 V, 1.5% Internal Voltage Reference
- Internal Soft Start
- Independent Power Good and Precision Enable for Each Output
- Current Mode, PWM Operation
- Thermal Shutdown
- Overvoltage Protection
- Start-up into Prebiased Output Loads
- Regulators are 180° Out of Phase
- Create a Custom Design Using the LM26420 With the WEBENCH® Power Designer
2 Applications
- Local 5 V to Vcore of FPGAs
- Core Power in HDDs and Set-Top Boxes
- USB Powered Devices
- Powering Core and I/O Voltages for CPUs and ASICs
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3 Description
The LM26420 regulator is a monolithic, high-efficiency dual PWM step-down DC/DC converter. This device has the ability to drive two 2-A loads with an internal 75-mΩ PMOS top switch and an internal 50-mΩ NMOS bottom switch using state-of-the-art BICMOS technology results in the best power density available. The world-class control circuitry allow on times as low as 30 ns, thus supporting exceptionally high-frequency conversion over the entire 3-V to 5.5-V input operating range down to the minimum output voltage of 0.8 V.
Although the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current. The LM26420 utilizes current-mode control and internal compensation to provide high performance regulation over a wide range of operating conditions.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LM26420 | HTSSOP (20) | 6.50 mm × 4.40 mm |
| WQFN (16) | 4.00 mm × 4.00 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
Device Images
LM26420 Dual Buck DC/DC Converter
LM26420 Efficiency (Up to 93%)
