JAJSAY1E March 2008 – October 2017 LM2854
PRODUCTION DATA.
- 1 特長
- 2 アプリケーション
- 3 概要
- 4 改訂履歴
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Input Filter Capacitor
- 8.2.2.2 AVIN Filtering Components
- 8.2.2.3 Soft-Start Capacitor
- 8.2.2.4 Tracking - Equal Soft-Start Time
- 8.2.2.5 Tracking - Equal Slew Rates
- 8.2.2.6 Enable and UVLO
- 8.2.2.7 Output Voltage Setting
- 8.2.2.8 Compensation Component Selection
- 8.2.2.9 Filter Inductor and Output Capacitor Selection
- 8.2.3 Application Curves
- 8.2.4 System Examples
- 9 Power Supply Recommendations
- 10Layout
- 11デバイスおよびドキュメントのサポート
- 12メカニカル、パッケージ、および注文情報
パッケージ・オプション
メカニカル・データ（パッケージ｜ピン）
- PWP|16
サーマルパッド・メカニカル・データ
- PWP|16
発注情報
8.2.3 Application Curves
Unless otherwise specified, the following conditions apply: VIN = PVIN = AVIN = EN = 5 V, CIN is 47-μF 10-V X5R ceramic capacitor, LO is from TDK SPM6530T family; TAMBIENT = 25°C.
Figure 22. LM2854 1-MHz Efficiency vs IOUT VOUT = 0.8 V, LO = 0.47 µH, 3.3-mΩ DCR
Figure 24. LM2854 1-MHz Efficiency vs IOUT VOUT = 1.2 V, LO = 0.68 µH, 4.9-mΩ DCR
Figure 26. LM2854 1-MHz Efficiency vs IOUT VOUT = 1.8 V, LO = 1 µH, 7.1-mΩ DCR
Figure 28. LM2854 500-kHz Efficiency vs IOUT VOUT = 2.5 V, LO = 2.2 µH, 16-mΩ DCR
Figure 30. LM2854 500-kHz Efficiency vs IOUT VOUT = 3.3 V, LO = 1.5 µH, 9.7-mΩ DCR
Figure 32. LM2854 1-MHz Bode Plot VIN = 3.3 V, VOUT = 1.8 V, IOUT = 4 A RFB1 = 150 kΩ, RCOMP = 1 kΩ, CCOMP = 100 pF, LOUT = 0.82 µH, COUT = 100-µF Ceramic
Figure 34. LM2854 1-MHz Bode Plot VIN = 5 V, VOUT = 1.8 V, IOUT = 4 A RFB1 = 150 kΩ, RCOMP = 1 kΩ, CCOMP = 100 pF, LOUT = 0.82 µH, COUT = 100 µF
Figure 36. LM2854 1-MHz Bode Plot VIN = 5 V, VOUT = 3.3 V, IOUT = 4 A RFB1 = 150 kΩ, RCOMP = 1 kΩ, CCOMP = 68 pF, LOUT = 0.82 µH, COUT = 100-µF Ceramic
Figure 38. LM2854 500-kHz Power On Characteristic
VIN = 5 V, VOUT = 1.8 V, IOUT = 4 A, CSS = 220 pF
Figure 40. LM2854 500-kHz Power Off Characteristic
VIN = 5 V, VOUT = 1.8 V, IOUT = 4 A, CSS = 220 pF
Figure 42. LM2854 500-kHz Start-up Waveform VOUT =
2.5 V, IOUT = 0 A
Figure 23. LM2854 1-MHz Efficiency vs IOUT VOUT = 2.5 V, LO = 1 µH, 7.1-mΩ DCR
Figure 25. LM2854 1-MHz Efficiency vs IOUT VOUT = 3.3 V, LO = 1 µH, 7.1-mΩ DCR
Figure 27. LM2854 500-kHz Efficiency vs IOUT VOUT = 0.8 V, LO = 1 µH, 7.1-mΩ DCR
Figure 29. LM2854 500-kHz Efficiency vs IOUT VOUT = 1.2 V, LO = 1.5 µH, 9.7-mΩ DCR
Figure 31. LM2854 500-kHz Efficiency vs IOUT VOUT = 1.8 V, LO = 1.5 µH, 9.7-mΩ DCR
Figure 33. LM2854 500-kHz Bode Plot VIN = 3.3 V,
VOUT = 1.8 V, IOUT = 4 A RFB1 = 250 kΩ, RCOMP = 1 kΩ, CCOMP = 47 pF, LOUT = 1.5 µH, COUT = 100-µF Ceramic
Figure 35. LM2854 500-kHz Bode Plot VIN = 5 V,
VOUT = 1.8 V, IOUT = 4 A RFB1 = 250 kΩ, RCOMP = 1 kΩ, CCOMP = 47 pF, LOUT = 1.5 µH, COUT = 100-µF Ceramic
Figure 37. LM2854 500-kHz Bode Plot VIN = 5 V,
VOUT = 3.3 V, IOUT = 4 A RFB1 = 250 kΩ, RCOMP = 1 kΩ, CCOMP = 33 pF, LOUT = 1.5 µH, COUT = 100-µF Ceramic
Figure 39. LM2854 500-kHz Power On through Enable
VIN = 5 V, VOUT = 1.8 V, IOUT = 4 A, CSS = 220 pF
Figure 41. LM2854 1-MHz Load Transient Response
VIN = 5 V, VOUT = 3.3 V, IOUT = 0.5-A to 4-A to 0.5-A step di/dt ≊ 4 A/µs, CO = 100-µF Ceramic
Figure 43. LM2854 500-kHz Pre-Biased Start-up Waveform (Oscilloscope Set at Infinite Persistence) VOUT = 2.5 V,
IOUT = 0 A, VPRE-BIAS = 1.25 V