The LM26400Y device is a monolithic, two-output fixed-frequency PWM step-down DC-DC regulator, in a 16-pin WSON or thermally-enhanced HTSSOP package. With a minimum number of external components and internal loop compensation, the LM26400Y is easy to use.
The ability to drive 2-A loads with an internal 175-mΩ NMOS switch using state-of-the-art 0.5-µm BiCMOS technology results in a high-power density design. The world class control circuitry allows for an ON-time as low as 40 ns, thus supporting high-frequency conversion over the entire input range of 3 V to 20 V and down to an output voltage of only 0.6 V. The LM26400Y utilizes peak current-mode control and internal compensation to provide high-performance regulation over a wide range of line and load conditions. Switching frequency is internally set to 500 kHz, optimal for a broad range of applications in terms of size versus thermal tradeoffs.
Given a nonsynchronous architecture, efficiencies above 90% are easy to achieve. External shutdown is included, enabling separate turnon and turnoff of the two channels. Additional features include programmable soft-start circuitry to reduce inrush current, pulse-by-pulse current limit and frequency foldback, integrated bootstrap structure, and thermal shutdown.
| Part number | Order | Vin (Min) (V) | Vin (Max) (V) | Vout (Min) (V) | Vout (Max) (V) | Iout (Max) (A) | Regulated outputs (#) | Switching frequency (Min) (kHz) | Switching frequency (Max) (kHz) | Iq (Typ) (mA) | Features | Control mode | Duty cycle (Max) (%) | Operating temperature range (C) | Rating | Package Group | Type | Package size: mm2:W x L (PKG) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM26400Y |
|
3 | 20 | 0.6 | 16 | 2 | 2 | 500 | 500 | 4 |
Enable
Light Load Efficiency Power Good Pre-Bias Start-Up |
Current Mode | 96 | -40 to 125 | Catalog |
HTSSOP | 16
WSON | 16 |
Converter |
16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
16WSON: 25 mm2: 5 x 5 (WSON | 16) |
| LM26420-Q1 |
|
3 | 5.5 | 0.8 | 4.5 | 2 | 2 | 550 | 2200 | 0.9 |
Enable
Light Load Efficiency Phase Interleaving Power Good Pre-Bias Start-Up Synchronous Rectification Multiple Outputs |
Current Mode | 98 | -40 to 125 | Automotive |
HTSSOP | 20
WQFN | 16 |
Converter |
20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)
16WQFN: 16 mm2: 4 x 4 (WQFN | 16) |
