The LM26420-Q1 regulator is a monolithic, high-efficiency dual PWM step-down DC/DC converter. This device has the ability to drive two 2A loads with an internal 75mΩ MOS top switch and an internal 50mΩ MOS 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 30ns, thus supporting exceptionally high-frequency conversion over the entire 3V to 5.5V input operating range down to the minimum output voltage of 0.8V.
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-Q1 uses current-mode control and internal compensation to provide high performance regulation over a wide range of operating conditions.
Because the switching frequency is made sure to be greater than 2MHz, the LM26420-Q1 can be used in automotive applications without causing interference in the AM frequency band.
PART NUMBER | PACKAGE(1) | PACKAGE SIZE(2) |
---|---|---|
LM26420-Q1 | PWP (HTSSOP, 20) | 6.5mm × 6.4mm |
RUM (WQFN, 16) | 4mm × 4mm |
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NUMBER | NAME | ||
1,2 | VIND1 | P | Power input supply for Buck 1 |
3 | SW1 | P | Output switch for Buck 1. Connect to the inductor. |
4 | PGND1 | G | Power ground pin for Buck 1 |
5 | FB1 | A | Feedback pin for Buck 1. Connect to external resistor divider to set output voltage. |
6 | PG1 | G | Power-Good Indicator for Buck 1. Pin is connected through a resistor to an external supply (open-drain output). |
7 | PG2 | G | Power-Good Indicator for Buck 2. Pin is connected through a resistor to an external supply (open-drain output). |
8 | FB2 | A | Feedback pin for Buck 2. Connect to external resistor divider to set output voltage. |
9 | PGND2 | G | Power ground pin for Buck 2 |
10 | SW2 | P | Output switch for Buck 2. Connect to the inductor. |
11, 12 | VIND2 | A | Power Input supply for Buck 2 |
13 | EN2 | A | Enable control input. Logic high enable operation for Buck 2. Do not allow this pin to float or be greater than VIN + 0.3 V. |
14 | AGND | G | Signal ground pin. Place the bottom resistor of the feedback network as close as possible to pin. |
15 | VINC | A | Input supply for control circuitry |
16 | EN1 | A | Enable control input. Logic high enable operation for Buck 1. Do not allow this pin to float or be greater than VIN + 0.3 V. |
DAP | Die Attach Pad | — | Connect to system ground for low thermal impedance and as a primary electrical GND connection. |
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NUMBER | NAME | ||
1 | VINC | A | Input supply for control circuitry |
2 | EN1 | A | Enable control input. Logic high enable operation for Buck 1. Do not allow this pin to float or be greater than VIN + 0.3 V. |
3, 4 | VIND1 | A | Power Input supply for Buck 1 |
5 | SW1 | P | Output switch for Buck 1. Connect to the inductor. |
6,7 | PGND1 | G | Power ground pin for Buck 1 |
8 | FB1 | A | Feedback pin for Buck 1. Connect to external resistor divider to set output voltage. |
9 | PG1 | G | Power Good Indicator for Buck 1. Pin is connected through a resistor to an external supply (open-drain output). |
10, 11, DAP | Die Attach Pad | — | Connect to system ground for low thermal impedance, but this pin cannot be used as a primary GND connection. |
12 | PG2 | G | Power Good Indicator for Buck 2. Pin is connected through a resistor to an external supply (open-drain output). |
13 | FB2 | A | Feedback pin for Buck 2. Connect to external resistor divider to set output voltage. |
14, 15 | PGND2 | G | Power ground pin for Buck 2 |
16 | SW2 | P | Output switch for Buck 2. Connect to the inductor. |
17, 18 | VIND2 | A | Power Input supply for Buck 2 |
19 | EN2 | A | Enable control input. Logic high enable operation for Buck 2. Do not allow this pin to float or be greater than VIN + 0.3 V. |
20 | AGND | G | Signal ground pin. Place the bottom resistor of the feedback network as close as possible to pin. |