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RT2657BQ是一款高效率的脉宽调变(PWM)降压型DC/ DC转换器,能在宽输入电压2.7V至5.5V范围下,提供600mA输出电流。RT2657BQ非常适合于那些由单节锂离子电池或其他电源来供电的可携式电子装置,如手机,PDA,手持装置,游戏机及相关配件。有低RDS(ON)的内部同步整流器能显著降低PWM模式时的导通损耗。在实际应用中,无需外部萧基二极管。当正常的脉冲 - 宽度模式不能提供稳定的输出电压时,RT2657BQ会进入低压差模式而连续导通高侧的P-MOSFET。当EN接脚为低电位时,RT2657BQ会进入电源关闭模式,仅消耗小于5μA的电流。由于操作频率固定在 2.25MHz,开关切换造成的涟波很容易藉小尺寸的过滤组件而过滤掉。RT2657BQ采用小型WDFN-8L 3x3封装。
VIN范围 : 2.7V至 5.5V
VOUT 范围 : 0.6V至 5.5V (100% 责任周期操作 )
VREF = 0.6V
ISD ≤ 5μA (VEN = 0V)
电流模式控制与内部补偿
固定 FSW 2.25MHz
RDS(ON) 230mΩ 高侧 / 250mΩ 低侧 (P-MOSFET/N-MOSFET)
启用 (VIH = 1V, VIL = 0.4V)
内部软启动 (0.3ms)
最高达600mA的输出电流
高达90%的高效率
ILIMIT 峰值 ( 典型值1.5A/最小值0.8A);欠压锁定(UVLO),欠压保护(UVP),VIN 和 VOUT 过压保护 (OVP) 及过温保护(OTP) 150°C
无需萧基二极管
内部补偿以减少外部组件数
AEC-Q100 Grade 3 认证
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