PDF《LM5118 宽电压范围降压/升压控制器》

4 修 修订 订历 历史 史记 记录 录注:之前版本的页码可能与当前版本有所不同. Changes from Revision I (August 2014) to Revision J Page ? 将汽车器件移到了单独的产品说明书中 (SNVSAX9)1 ? Moved the storage temp parameters to the Absolute Maximum Ratings

6 ? Changed junction temperature range from: ±150°C max to: C40°C to 150°C

6 ? Changed Handling Ratings table to ESD Ratings.6 ? Moved the junction temperature ranges to the condition statement

7 ? Removed the VOLL minimum value.8 ? Removed the VOLH minimum value.8 Changes from Revision H (October 2013) to Revision I Page ? 已更改 产品说明书流程和布局,以符合新的 TI 标准.添加了以下部分:应用和实施;

电源建议;

布局;

器件和文档 支持;

机械、封装和订购信息

1 ? Deleted footnote These pins must not be raised above VIN.6 Changes from Revision G (February, 2013) to Revision H Page ? Deleted VIN Range on Functional Block Diagram.12 ? Changed Figure 19.24 ? Changed Inductor Selection, L1 Text

27 ? Changed Equation 15.27 ? Changed Equation

16 27 ? Added Efficiency Parameter

27 ? Changed II(PEAK) Value

28 ? Changed I2(PEAK) Value.28 ? Changed R13 = RSENSEText

28 ? Added Equation

19 28 ? Added Equation

20 28

3 LM5118 www.ti.com.cn ZHCSGH0J CAPRIL 2008CREVISED JUNE

2017 Copyright ? 2008C2017, Texas Instruments Incorporated ? Changed Equation

21 28 ? Changed Equation

22 28 ? Changed R13(BUCK) Value.28 ? Changed R13(BUCK-BOOST) Value

28 ? Added Inductor Current Limit Calculation Section.29 ? Added Equation

24 29 ? Added Equation

26 29 ? Changed Equation

29 29 ? Changed ESRMAX Value

29 ? Deleted Previous Equation 17.30 ? Deleted Previous Equation 18.30 ? Changed C1 - C5 = Input Capacitor Text.30 ? Changed R8, R9 Text.31 ? Changed Equation

38 31 ? Changed R1, R3, C21 Text

31 ? Changed Equation

40 32 ? Changed DMIN to DMAX

32 ? Changed DMAX Value

32 ? Changed DC Gain(MOD) Value.32 ? Changed ESRZERO Value.32 ? Changed R4, C18, C17 Text

33 ? Changed Figure 21.34 ? Changed Figure 22.34 ? Changed Figure 23.34 ? Added Figure

24 34 ? Added Figure

25 34 ? Added Figure

26 34 Changes from Revision F (February 2013) to Revision G Page ? Changed layout of National Data Sheet to TI format

24 4 LM5118 ZHCSGH0J CAPRIL 2008CREVISED JUNE

2017 www.ti.com.cn Copyright ? 2008C2017, Texas Instruments Incorporated (1) G = Ground, I = Input, O = Output, P = Power

5 Pin Configuration and Functions PWP Package 20-Pin HTSSOP (Top View) Pin Descriptions PIN TYPE(1) DESCRIPTION NO. NAME

1 VIN P/I Input supply voltage.

2 UVLO I If the UVLO pin is below 1.23 V, the regulator will be in standby mode (VCC regulator running, switching regulator disabled). When the UVLO pin exceeds 1.23 V, the regulator enters the normal operating mode. An external voltage divider can be used to set an undervoltage shutdown threshold. A fixed 5-?A current is sourced out of the UVLO pin. If a current limit condition exists for

256 consecutive switching cycles, an internal switch pulls the UVLO pin to ground and then releases.

3 RT I The internal oscillator frequency is set with a single resistor between this pin and the AGND pin. The recommended frequency range is

50 kHz to

500 kHz.

4 EN I If the EN pin is below 0.5 V, the regulator will be in a low power state drawing less than

10 ?A from VIN. EN must be raised above

3 V for normal operation.

5 RAMP I Ramp control signal. An external capacitor connected between this pin and the AGND pin sets the ramp slope used for emulated current mode control.