Cypress S6BP201A降压-升压DC/DC转换器解决方案

cypress公司的S6BP201A是有四个内置开关FET的降压-升压DC/DC转换器，输入电压从2.5V到42V，负载电流高达1.0A，在低负载时能自动改变到PFM模式，以得到超高效率，静态电流非常低20uA，工作频率200kHz到2.1MHz，可选择的输出电压5.000V/5.050V/5.075V/5.100V/5.125V/5.150V/5.200V，和规范AEC-Q100兼容（Grade-1），主要用在车体控制模块（BCM），网关模块，汽车应用和工业应用。本文介绍了S6BP201A主要特性，框图和架构框图，应用电路以及评估板S6SBP201A1AVA1001，S6SBP202A1FVA1001和S6SBP203A8FVA1001，框图和指标，框图，电路图，材料清单和PCB设计图。

S6BP201A is a 1-Ch Buck-boost DC/DC converter IC with four built-in switching FETs. This IC is able to supply up to 1.0A of loadcurrent within the very wide range from 2.5V to 42V in the input voltage. This IC has an operation mode that is automatically changedto PFM operation during low load， which can achieve super-high efficiency with a very low quiescent current 20 μA. It is possible toprovide stable output voltage from an automotive cold cranking and load dump， up to 42V， conditions within 1 ms transition time. As aresult， this IC is suitable for power supply solutions of automotive and Industrial applications. This IC has the SYNC function， which iscapable of selecting the SYNC_IN that is able to inputs an external clock signal. When an external clock signal in the range from 200kHz to 400 kHz is inputted， the FETs perform the switching operation with synchronizing signal from an external clock. When anexternal clock signal is not inputted， the FETs perform the switching operation from an internal clock. The internal clock signal in therange from 200 kHz to 2.1 MHz can be set by an external resistor. Since external voltage setting resistors and phase compensationcapacitors are not required with this IC， it can reduce the number of parts and a part mounting area. This IC has five protectionfunctions， input under voltage lockout （input UVLO）， output under voltage protection （output UVP）， output over voltage protection（output OVP）， output over current protection （output OCP）， and thermal shutdown （TSD）。 Moreover， this IC has the power good （PG）function that indicates the state of the output voltage （VOUT pin）。 When the output voltage reaches the PG voltage， the PG signal isoutputted. The VOUT output voltage of this product is selectable from the product lineup.

S6BP201A主要特性：

 Wide input voltage range： 2.5V to 42V

 Selectable output voltage （factory settable）：

5.000V/5.050V/5.075V/5.100V/5.125V/5.150V/5.200V

 Wide operating frequency range： 200 kHz to 2.1 MHz

 External synchronized clock range： 200 kHz to 400 kHz

 SYNC function

 SYNC_IN： External clock input（Unless inputting clock， this IC operates by internal clock）

 Super-high efficiency by PFM operation（When setting MODE pin to a low level）

 Automatic PWM/PFM switching operation and fixed PWMoperation are selectable by MODE pin

 Built-in switching FET

 Synchronous current mode architecture

 Shutdown current： Lower than 1 μA

 Quiescent current： 20 μA

 Power Good Monitor

 Output voltage monitoring by window comparator

 Power-on reset time： 14 ms

 Soft start time without load dependence ： 0.9 ms（When switching frequency =2.1 MHz）

 Enhanced protection functions

 Input under voltage lockout

 Output under voltage protection： 95.5%

 Output over voltage protection： 104.5%

 Output over current protection

 Thermal shutdown

 Small ETSSOP16 package （exposed PAD）： 5 mm × 6.4 mm

 AEC-Q100 compliant （Grade-1）

S6BP201A应用：

 Body Control Module （BCM）

 Gateway module

 Automotive applications

 Industrial applications

图1. S6BP201A框图

图2. S6BP201A架构框图

图3. S6BP201A应用案例电路图

应用案例电路元件列表：

评估板S6SBP201A1AVA1001，S6SBP202A1FVA1001和S6SBP203A8FVA1001

S6SBP201A1AVA1001， S6SBP202A1FVA1001 and S6SBP203A8FVA1001 are the evaluation kit forprimary power block of automotive.

These boards implement power management IC S6BP201A， S6BP202A， S6BP203A each.

It is necessary to prepare DC power supply.

图4.评估板S6SBP201A1AVA1001，S6SBP202A1FVA1001和S6SBP203A8FVA1001框图

评估板S6SBP201A1AVA1001，S6SBP202A1FVA1001和S6SBP203A8FVA1001指标：

图5.评估板电路图

评估板S6SBP201A1AVA1001，S6SBP202A1FVA1001和S6SBP203A8FVA1001材料清单：

图6.评估板元件布局图

图7.评估板线布局图