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LM26420 稳压器是一款单片高效双路 PWM 降压直流/直流转换器。该器件可使用一流的 BICMOS 技术通过内部 75mΩ PMOS 顶部开关和内部 50mΩ NMOS 底部开关驱动两个 2A 负载,实现最佳的功率密度。世界级控制电路可实现低至 30ns 的接通时间,从而在整个 3V 至 5.5V 输入工作范围内支持低至 0.8V 的最小输出电压的出色高频转换。
尽管运行频率很高,但仍可以轻松实现高达 93% 的效率。具备外部关断功能,因此具有超低的待机电流。LM26420 可利用电流模式控制和内部补偿在各种运行条件下提供高性能调节。
器件型号 | 封装 | 封装尺寸(标称值) |
---|---|---|
LM26420 | HTSSOP (20) | 6.50mm x 4.40mm |
WQFN (16) | 4.00mm × 4.00mm |
Changes from K Revision (April 2016) to L Revision
Changes from J Revision (September 2015) to K Revision
Changes from I Revision (June 2015) to J Revision
Changes from H Revision (August 2014) to I Revision
Changes from G Revision (July 2014) to H Revision
Changes from F Revision (March 2013) to G Revision
PIN | TYPE | 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 it 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. |