JAJSAY1E March   2008  – October 2017 LM2854

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーション回路
  4. 4 改訂履歴
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Switching Frequency
      2. 7.3.2  Enable
      3. 7.3.3  Soft-Start
      4. 7.3.4  Tracking
      5. 7.3.5  Pre-Biased Start-up Capability
      6. 7.3.6  Feedback Voltage Accuracy
      7. 7.3.7  Positive Current Limit
      8. 7.3.8  Negative Current Limit
      9. 7.3.9  Overtemperature Protection
      10. 7.3.10 Loop Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Soft-Start and Track Mode
      3. 7.4.3 Normal Operating Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Filter Capacitor
        2. 8.2.2.2 AVIN Filtering Components
        3. 8.2.2.3 Soft-Start Capacitor
        4. 8.2.2.4 Tracking - Equal Soft-Start Time
        5. 8.2.2.5 Tracking - Equal Slew Rates
        6. 8.2.2.6 Enable and UVLO
        7. 8.2.2.7 Output Voltage Setting
        8. 8.2.2.8 Compensation Component Selection
        9. 8.2.2.9 Filter Inductor and Output Capacitor Selection
      3. 8.2.3 Application Curves
      4. 8.2.4 System Examples
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 ドキュメントのサポート
      1. 11.1.1 関連資料
    2. 11.2 商標
    3. 11.3 静電気放電に関する注意事項
    4. 11.4 Glossary
  12. 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）
サーマルパッド・メカニカル・データ
発注情報

8.2.4 System Examples

This section provides several application solutions with an associated bill of materials, listed in Table 5 to Table 7. All bill of materials reference the schematic in Figure 44. The compensation for each solution was optimized to work over the full input range. Many applications have a fixed input voltage rail. It is possible to modify the compensation to obtain a faster transient response for a given input voltage operating point.

LM2854 30052854.gifFigure 44. LM2854 Application Circuit Schematic

Table 5. LM2854 500-kHz Bill of Materials, VIN = 5 V, VOUT = 3.3 V, IOUT(MAX) = 4 A, Optimized for Efficiency

REF DES DESCRIPTION CASE SIZE MANUFACTURER MANUFACTURER P/N
U1 Synchronous Buck Regulator HTSSOP-16 Texas Instruments LM2854MHX-500
CIN 47 µF, X5R, 10 V 1210 TDK C3225X5R1A476M
CO 100 µF, X5R, 6.3 V 1210 TDK C3225X5R0J107M
LO 1.5 µH, 9.7 mΩ, 10 A 7.1 × 6.5 × 3.0 mm TDK SPM6530T-1R5M100
RFB1 249 kΩ 0603 Vishay Dale CRCW06032493F-e3
RFB2 80.6 kΩ 0603 Vishay Dale CRCW060328062F-e3
RCOMP 1 kΩ 0603 Vishay Dale CRCW06031001F-e3
RF 1 Ω 0603 Vishay Dale CRCW06031R0F-e3
CCOMP 33 pF, ±5%, C0G, 50 V 0603 TDK C1608C0G1H330J
CSS 10 nF, ±10%, X7R, 16 V 0603 Murata GRM188R71C103KA01
CF 1.0 µF, ±10%, X7R, 10 V 0603 Murata GRM188R71A105KA61

Table 6. LM2854 1-MHz Bill of Materials, VIN = 3.3 V to 5 V, VOUT = 2.5 V, IOUT (MAX) = 4 A, Optimized for Electrolytic Input and Output Capacitance

REF DES DESCRIPTION CASE SIZE MANUFACTURER MANUFACTURER P/N
U1 Synchronous Buck Regulator HTSSOP-16 Texas Instruments LM2854MHX-1000
CIN 150 µF, 6.3 V, 18 mΩ C2, 6 × 3.2 × 1.8 mm Sanyo 6TPE150MIC2
CO 330 µF, 6.3 V, 18 mΩ D3L, 7.3 × 4.3 × 2.8 mm Sanyo 6TPE330MIL
LO 2.2 µH, 16 mΩ, 7 A 6.47 × 6.86 × 3 mm Vishay Dale IHLP2525CZER2R2M11
RFB1 100 kΩ 0603 Vishay Dale CRCW06031003F-e3
RFB2 47.5 kΩ 0603 Vishay Dale CRCW060324752F-e3
RCOMP 15 kΩ 0603 Vishay Dale CRCW06031502F-e3
RF 1 Ω 0603 Vishay Dale CRCW06031R0F-e3
CCOMP 330 pF, ±5%, C0G, 50 V 0603 TDK C1608C0G1H331J
CSS 10 nF, ±10%, X7R, 16 V 0603 Murata GRM188R71C103KA01
CF 1 µF,±10%, X7R, 10 V 0603 Murata GRM188R71A105KA61

Table 7. LM2854 1-MHz Bill of Materials, VIN = 3.3 V, VOUT = 0.8 V, IOUT (MAX) = 4 A, Optimized for Solution Size and Transient Response

REF DES DESCRIPTION CASE SIZE MANUFACTURER MANUFACTURER P/N
U1 Synchronous Buck Regulator HTSSOP-16 Texas Instruments LM2854MHX-1000
CIN 47 µF, X5R, 6.3 V 1206 TDK C3216X5R0J476M
CO 47 µF, X5R, 6.3 V 1206 TDK C3216X5R0J476M
LO 0.47 µH, 14.5 mΩ, 7 A 4.06 × 4.45 × 2.00 mm Vishay Dale IHLP1616BZER0R47M11
RFB1 110 kΩ 0402 Vishay Dale CRCW04021103F-e3
RCOMP 1 kΩ 0402 Vishay Dale CRCW04021001F-e3
RF 1 Ω 0402 Vishay Dale CRCW04021R0F-e3
CCOMP 27 pF, ±5%, C0G, 50 V 0402 Murata GRM1555C1H270JZ01
CSS 10 nF, ±10%, X7R, 16 V 0402 Murata GRM155R71C103KA01
CF 1 µF, ±10%, X7R, 10 V 0402 Murata GRM155R61A105KE15