【选型】同步降压转换器SCT2432兼容替代LMR14030，静电电流Iq仅25uA

时间： 2021-06-22 来源：世强

技术问答

在一些工业电源设备产品中大多用户都采用24V或36V电源电压给系统进行供电，某客户之前选用TI品牌的LMR14030非同步降压转换器实现5V/3A的输出。由于国产化替代的需求，本文推荐国产芯洲品牌的SCT2432，该SCT2432降压转换器为同步拓扑结构形式，并且在芯片管脚上可以进行PIN TO PIN替代LMR14030，如下为两款产品的典型电气参数对比：

图1 SCT2432和LMR14030典型电气参数对比

通过上述表格中的参数对比，我们可以看到：

1、两款DCDC产品均可支持高达40V的宽范围输入电压，满足典型24V和36V输入电源电压的产品应用；

2、最大输出电流能力3.5A，SCT2432在IQ低功耗上表现较为优异；

3、SCT2432采用同步拓扑结构形式，相比较于LMR14030异步拓扑，芯片内部集成了MOSFET替代异步形式外置的续流二极管，大大降低了损耗，另一方面还降低了整个BOM成本；

4、两款产品均采用SOP-8封装形式，尺寸大小：4.89x3.90mm，可以实现引脚兼容替代。如图2所示为两款产品的封装引脚及典型应用电路图。

图2 SCT2432（左）和LMR14030（右）引脚和典型应用电路图

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P4SM6.8CA-200A,CM2302C,CM2302B,CM2302A,AU3321D5,SMDJ5.0CA-220CA,SMAJ5.0A-550A,SMF5.0A-220CA,CM3416E,3.0SMC6.8CA-250CA,AU1801P1,CM3134EW,CM3404B,CMN3018S8,AR0501S2,CM2301G,AU1221P1,AU1221P0,CM2301C,CM60N10AGB,CM2301B,CM2301A,AR0534P3,CMP2033S8,AR0521M0,AR0521M1,CMN6075S9,S4MP5.0CA-170A,1.0SMBJ6.8CA-530A,P4SM6.8A-200CA,ASD08C,5.0SMDJ11A-220A,AR0501P0,CMN2006F3,CMN6009S8,CM65R360_F,AU0701D5,ASD12,ASMBS10A-43A,AR0524P5,AU2401D5,AR0501P1,AU0771P1,CMN3205B,1.5SMC6.84-600A,AR1203P3,SMBJ5.0A-550CA,CM65R360_P,CM60R2K2_D,5.0SMDJ11CA-220CA,SMCJ5.0A-550A,3KP5.0A-220A,AST05,CM05N50U,CMN251R0F5,AU0541P1,ASD08,AR0502S2,AR0502S1,AU2581P1,CM60R2K2_U,CMO4N65U,CMO4N65P,ASD05,ALCDA15C-1,3KP5.0A-220CA,AR0502S5,ASD12CL,CMN2006U,AR0541D3,5KP5.0A-220CA,CMO4N65F,P4SMA6.8A-600CA,CMO4N65D,P4SMA6.8CA-600CA,SMBJ5.0CA-550A,1.5SMB6.8CA-250A,AU1231P1,S4MP5.0A-170A,5.0SMDJ11CA-220A,AR0502P6,CM9435,AR0502P1,AR0502P2,AU0521P1,ASD24CL,AU0521P0,15KP5.0A-220CA,SMBJ5.0CA-550CA,AU0761M1,AU0761M0,AU3381P1,AU0861P0,AU1232S5,CM65R850_F,CMN3205P,CM65R850_P,AU3611P1,CM2305B,CM2305A,AU0561D5,CM2N7002DW,AU0522S2,ASD36CL,AU0581P1M,AU1501D5,3.0SMC6.8A-250A,AU0581P1H,AU1811P1,AU2881D3,SMB6.8A-250CA1.5,AR3311D3H,ASD05L,AU0521PZ,P4KE6.8A-600A,CM2304A,ASD05C,CM65R850_U,AR1201P1,CM60R150_F,CM60N10AGP,CM60R150_K,AU0533S1,P6KE6.8A-600A,AUO811P1,AR0504S6,AU1221P1L,SMB15.J5.0A-180CA,P6SMA6.8CA-440CA,AR0504S2,AR0504S3,AU0531P1,AU0521S5,AU3304P7,CM1601,CM1602,CM3415E,ASM05C,CM2N7002,CM2324,P6SMA6.8A-440A,CM2326,ASM05H,AU1204S2,ASD15CM,CMN3013F3D,P4SM6.8CA-200CA,1.5KE6.8A-600CA,CMBSS84,AR2504P9,AU3311P0,P6SMB6.BA-600CA,AR2504P8,AU1881P1,AU3311P1,AU0771D5,CM3400,CM2310,AR2504P3,ASD24L,ASD12L,CM2312,CM3401,ASD36L,ASD12C,AU3351D5,AU2512PT,AU1231D5,AU0511P0,AU0521M0,AU0511P1,ASD36C,AU0524S2,ASD24C,CM2615E,AR3354S2,AU0521M1,SMDJ5.0CA-220A,CM3407,CM100N15GB,LC03-3.3,ALCA24C-1,AU0511PF,AU0551D5,CM2616E,AU0522P1,ALCDA12C-1,CMN3003B,1.0SMBJ6.8CA-530CA,CM2N7002K,SMDJ5.0A-220A,CM8205S,CM4407,AR0531P1,AU1201P0,AU1201P1,ASD05CL,AR0554P3,AR1211P1,AR2411D3,ASM1235,AU3321P0,ASR3.3,S4MP5.0CA-170CA,CM40P03U,AU3321P1,AR0521P1,AR0534S2,AR0511S1,AU0531D5,CMN3010F3,AR0521P0,AU0531D9,AU0504S6,AR0521P6,AU4581P1,CM65R2K6_D,AR2421D5,CMN4006F3,LC03-6,AU0502P1,AU0514PD,SMCJ5.0CA-550CA,CMN3004U,CM65R2K6_U,ASM36C,ASM24C,ASM12C,AU3401T1,ASM12H,CMN401R0F5,P4SMA6.8CA-600A,5KP5.0A-220A,P2SM6.8CA-250CA,AU3301P1,AU0721P1,CM60N10AGF5,AU0721P0,P4SMA6.8A-600A,CM2300,AR2502S8,ASM15C,AU1211P1,ASD33L,CM65R550_F,ASMF05C,CM2303,ASMF05L,AU1224S6,ASM15H,AU0521P1L,ASD33C,AR0544MP,CM65R550_P,AU0501P0,AU0501P1,SMDJ5.0A-220CA1.0,AR0534P9,CM2305,ASL05C,CM7319S8,AU0731P1,CM4953,AR3321P0,AR3321P1,AU0524P7,AU0541D5,AU0512P1,AR1255P4,P6KE6.8CA-600A,5.0SMC13A-250CA5.0,CM4407AF3,CMN6009F5,AR4501D9,CM65R190_P,ASM15,AR0551S2,ASM12,SLVU2.8-4,ASM33C,5.0SMC13A-250A,SLVU2.8-8,AU0506S8,ASM33H,AR3311P6,CMN4004F5,CM65R190_F,AU1201D5,CM65R190_K,ASM05,AR0507M8,AU0521D5,ASD40L,AU0521D9,SMBJ6.8A-530CA1.5,AR0508PB,ASD40C,SMCJ5.0A-550CA,ASL05-36,AU0521D3,CM3134E,AU2421P1,CMN3008F5,AU0505S2,SMBJ5.0A-550A,SMB15.J5.0A-180A,ASM33,SMB10J5.0CA-440A,ASM36,AR0552S2,SMA6J5.0CA-220CA,CM3134T,AU0505S6,SMC6.84-600CA,SMCJ5.0CA-550A,5.0SMC13CA-250A,CM70R400_P,CM3134K,CM1602S,AR0921P1,CMP3031F2,CM70R400_F,CMP3049S8,1.5KE6.8A-600A,AR8001S2,1.5SMC6.8C4-600A,P6SMB6.BCA-600CA,ASM24,SMAJ5.0CA-550A,SMA6J5.0CA-220A,CMN4008LU,CM1601S,AR0508MP,AU0504S2,CM10N65F,P2SM6.8A-250CA,AU0504S5,CM10N65P,ASR70,AU1521P1,CMN6075AS9,AU1521P0,SMB15.J5.0CA-180A,AUO701PIL,AU2411P1,CM60N10GF5,15KP5.0CA-220CA,AR3324P5,CM60R125_K,AU2521P0,AU2521P1,CMO5N50D,CMN3012S8,AR1511D3,P4KE6.8A-600CA,P6KE6.8A-600CA,3KP5.0CA-220A,SMB10J5.0CA-440CA,5KP5.0CA-220A,AR0524P5L,1.5SMB6.8A-250A,CM60R125_F,ASDO8CL,1.5KE6.8CA-600CA,CM60R090_K,AU0511D5,AR3304S2,AR0541P1,AU0511D9,P2SM6.8CA-250A,AR0554S8,AR1821P1,1.0SMBJ6.8A-530A,AU1221D3,CMN6086S8D,AU1221D5,P6SMA6.8A-440CA,AU0581P1,AR0821P1,ASD40CL,ASDOBL,SRV05-4E,AU2804S8,CM3139EW,CM4435,SMF5.0A-220A,ASRV05-4,CM07N80F,AU0701P1,CM07N80P,AU2401P1,CMN2006S8,AU3601D5,1.5SMB6.8CA-250CA,CMN6006S8,AR0504P3,AR0811D3,AR0504P4,5KP5.0CA-220CA,AU3601P1,AU0721D5,AR3321D5,S4MP5.0A-170CA,1.5KE6.8CA-600A,P6SMB6.BA-600A,AU0791P1,SMF5.0CA-220A,AU0561P0,AU0561P1,AR2421P1,SMA6J5.0A-220CA,AR0514MP,CMN4006S8,AR0521D5,ASMF05,AR0521D3,AR0504P9,AR0504PC,AR0521D9,CMN3004F5,P6SMB6.BCA-600A,AU0506M8,CM8205,5.0SMC13CA-250CA,P2SM6.8A-250A,LC03-3.3L,AR0504MP,AU3301D5,AU3301D3,SMB15.J5.0CA-180CA,AR0511D3,AU1821P1,ASD1524,CM12N65F,3.0SMC6.8CA-250A,CMBSS138,CM12N65P,SMF5.0CA-220CA,AU0501D5,P6KE6.8CA-600CA,AU1211P1L,AR3304P9,AR3304P8,SMDJ11A-220CA,AR3304P5,CM65R280_P,1.5SMC6.8C4-600CA,P4KE6.8CA-600CA,AR3304P3,AU0501D1,AU1521D5,CM65R280_F,AR3603P3,CMN3003F5,15KP5.0A-220A,P6SMA6.8CA-440A,AR1521P1,CMO4N80U,3KP5.0CA-220CA,ASD33,CM07N65F,CM07N65D,AR7004S2,SMAJ5.0A-550CA,ASD36,CMO4N80D,CM07N65P,SMB10J5.0A-440A,SMAJ5.0CA-550CA,CM07N65U,15KP5.0CA-220A,AU3351P1,AST24,AR3306PA,CM70R1K1_U,AU1261P1,SRV05-4,CMN2342,ASD24,CM70R1K1_D,AU0561M1,AR3311D3,AR0506PA,AU0551P1,AR1501P1,AU0561M0,CMN3006F3,AR121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