JAJS844D December   1999  – May 2016 LM2594 , LM2594HV

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics - 3.3 V
    6. 7.6  Electrical Characteristics - 5 V
    7. 7.7  Electrical Characteristics - 12 V
    8. 7.8  Electrical Characteristics - Adjustable
    9. 7.9  Electrical Characteristics - All Output Voltage Versions
    10. 7.10 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Delayed Start-Up
      2. 8.3.2 Undervoltage Lockout
      3. 8.3.3 Inverting Regulator
      4. 8.3.4 Inverting Regulator Shutdown Methods
    4. 8.4 Device Functional Modes
      1. 8.4.1 Discontinuous Mode Operation
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Input Capacitor (CIN)
      2. 9.1.2 Output Capacitor (COUT)
      3. 9.1.3 Catch Diode
      4. 9.1.4 Inductor Selection
      5. 9.1.5 Output Voltage Ripple and Transients
      6. 9.1.6 Open Core Inductors
    2. 9.2 Typical Applications
      1. 9.2.1 Series Buck Regulator (Fixed Output)
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Inductor Selection (L1)
          2. 9.2.1.2.2 Output Capacitor Selection (COUT)
          3. 9.2.1.2.3 Catch Diode Selection (D1)
          4. 9.2.1.2.4 Input Capacitor (CIN)
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Series Buck Regulator (Adjustable Output)
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Programming Output Voltage
          2. 9.2.2.2.2 Inductor Selection (L1)
          3. 9.2.2.2.3 Output Capacitor Selection (COUT)
          4. 9.2.2.2.4 Feedforward Capacitor (CFF)
          5. 9.2.2.2.5 Catch Diode Selection (D1)
          6. 9.2.2.2.6 Input Capacitor (CIN)
        3. 9.2.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Considerations
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 関連リンク
    2. 12.2 コミュニティ・リソース
    3. 12.3 商標
    4. 12.4 静電気放電に関する注意事項
    5. 12.5 Glossary
  13. 13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

7 Specifications

7.1 Absolute Maximum Ratings(1)(2)

MIN MAX UNIT
Supply voltage LM2594 45 V
LM2594HV 60
ON/OFF pin input voltage −0.3 25 V
Feedback pin voltage −0.3 25 V
Output voltage to ground (steady state) −1 V
Power dissipation Internally limited
Lead temperature D8 package     Vapor phase (60 s) 215 °C
Infrared (15 s) 220
P package (soldering, 10 s) 260
Maximum junction temperature 150 °C
Storage temperature, Tstg −65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)(2) ±2000 V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) The human-body model is a 100-pF capacitor discharged through a 1.5k resistor into each pin.

7.3 Recommended Operating Conditions

MIN MAX UNIT
Supply voltage LM2594 4.5 40 V
LM2594HV 4.5 60 V
Temperature −40 125 °C

7.4 Thermal Information

THERMAL METRIC(1) LM2594, LM2594HV UNIT
D (SOIC) P (PDIP)
8 PINS 8 PINS
RθJA Junction-to-ambient thermal resistance(2)(3) 150 95 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.
(2) The package thermal impedance is calculated in accordance to JESD 51-7.
(3) Thermal resistances were simulated on a 4 -layer, JEDEC board.

7.5 Electrical Characteristics – 3.3 V

Specifications are for TJ = 25°C, VINmax= 40 V for the LM2594 and 60 V for the LM2594HV (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP(1) MAX(2) UNIT
SYSTEM PARAMETERS(3) (see Figure 35 for test circuit)
VOUT Output voltage 4.75 V ≤ VIN ≤ VINmax,
0.1 A ≤ ILOAD ≤ 0.5 A		 TJ = 25°C 3.432 3.3 3.168 V
Over full operating temperature range 3.465 3.135
η Efficiency VIN = 12 V, ILOAD = 0.5 A 80%
(1) Typical numbers are at 25°C and represent the most likely norm.
(2) All limits ensured at room temperature and at temperature extremes. All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the LM2594xx is used as shown in the Figure 35 test circuit, system performance is as shown in the system parameters.

7.6 Electrical Characteristics – 5 V

Specifications are for TJ = 25°C (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP(1) MAX(2) UNIT
SYSTEM PARAMETERS(3) (see Figure 35 for test circuit)
VOUT Output voltage 7 V ≤ VIN ≤ VINmax,
0.1 A ≤ ILOAD ≤ 0.5 A		 TJ = 25°C 4.8 5 5.2 V
Over full operating temperature range 4.75 5.25
η Efficiency VIN = 12 V, ILOAD = 0.5 A 82%
(1) Typical numbers are at 25°C and represent the most likely norm.
(2) All limits ensured at room temperature and at temperature extremes. All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the LM2594xx is used as shown in the Figure 35 test circuit, system performance is as shown in the system parameters.

7.7 Electrical Characteristics – 12 V

Specifications are for TJ = 25°C (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP(1) MAX(2) UNIT
SYSTEM PARAMETERS(3) (see Figure 35 for test circuit)
VOUT Output voltage 15 V ≤ VIN ≤ VINmax,
0.1 A ≤ ILOAD ≤ 0.5 A		 TJ = 25°C 11.52 12 12.48 V
Over full operating temperature range 11.4 12.6
η Efficiency VIN = 25 V, ILOAD = 0.5 A 88%
(1) Typical numbers are at 25°C and represent the most likely norm.
(2) All limits ensured at room temperature and at temperature extremes. All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the LM2594/LM2594HV is used as shown in the Figure 35 test circuit, system performance is as shown in the system parameters.

7.8 Electrical Characteristics – Adjustable

Specifications are for TJ = 25°C (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP(1) MAX(2) UNIT
SYSTEM PARAMETERS(3) (see Figure 35 for test circuit)
VFB Feedback voltage 4.5 V ≤ VIN ≤ VINmax,
0.1 A ≤ ILOAD ≤ 0.5 A,
VOUT programmed for 3 V,
Circuit of Figure 35		 TJ = 25°C 1.193 1.23 1.267 V
Over full operating temperature range 1.18 1.28
η Efficiency VIN = 12 V, ILOAD = 0.5 A 80%
(1) Typical numbers are at 25°C and represent the most likely norm.
(2) All limits ensured at room temperature and at temperature extremes. All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3) External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator system performance. When the LM2594/LM2594HV is used as shown in the Figure 35 test circuit, system performance is as shown in the system parameters.

7.9 Electrical Characteristics – All Output Voltage Versions

Specifications are for TJ = 25°C, VIN = 12 V for the 3.3-V, 5-V, and adjustable version, and VIN = 24 V for the 12-V version, ILOAD = 100 mA (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP(1) MAX(2) UNIT
DEVICE PARAMETERS
Ib Feedback bias current Adjustable version only, VFB = 1.3 V TJ = 25°C 10 50 nA
Over full operating temperature range 100
fO Oscillator frequency See(3) TJ = 25°C 127 150 173 kHz
Over full operating temperature range 110 173
VSAT Saturation voltage IOUT = 0.5 A(4)(5) TJ = 25°C 0.9 1.1 V
Over full operating temperature range 1.2
DC Max duty cycle (ON) See(5) 100%
Min duty cycle (OFF) See(6) 0%
ICL Current limit Peak current(4)(5) TJ = 25°C 0.65 0.8 1.3 A
over full operating temperature range 0.58 1.4
IL Output leakage current Output = 0 V(4)(6)(7)   
Output = −1 V		 50 μA
2 15 mA
IQ Quiescent current See(6) 5 10 mA
ISTBY Standby quiescent current ON/OFF pin = 5 V (OFF)(7) 85 μA
LM2594 TJ = 25°C 200 μA
Over full operating temperature range 250
LM2594HV TJ = 25°C 140 250 μA
Over full operating temperature range 300
ON/OFF CONTROL (see Figure 35 for test circuit)
ON/OFF pin logic input 1.3 V
VIH Threshold voltage Low (regulator ON), over full operating temperature range 0.6 V
VIL High (regulator OFF), over full operating temperature range 2 V
IH ON/OFF pin input current VLOGIC = 2.5 V (regulator OFF) 5 15 μA
IL VLOGIC = 0.5 V (regulator ON) 0.02 5 μA
(1) Typical numbers are at 25°C and represent the most likely norm.
(2) All limits ensured at room temperature and at temperature extremes. All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3) The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current overload.
(4) No diode, inductor or capacitor connected to output pin.
(5) Feedback pin removed from output and connected to 0 V to force the output transistor switch ON.
(6) Feedback pin removed from output and connected to 12 V for the 3.3-V, 5-V, and the adjustable version, and 15 V for the 12-V version, to force the output transistor switch OFF.
(7) VIN = 40 V for the LM2594 and 60 V for the LM2594HV.

7.10 Typical Characteristics

LM2594 LM2594HV 01243904.png Figure 1. Normalized Output Voltage
LM2594 LM2594HV 01243906.png Figure 3. Efficiency
LM2594 LM2594HV 01243908.png Figure 5. Switch Current Limit
LM2594 LM2594HV 01243910.png Figure 7. Quiescent Current
LM2594 LM2594HV 01243912.png Figure 9. Minimum Operating Supply Voltage
LM2594 LM2594HV 01243914.png Figure 11. ON /OFF Pin Current (Sinking)
LM2594 LM2594HV 01243916.png Figure 13. Feedback Pin Bias Current
LM2594 LM2594HV 01243905.png Figure 2. Line Regulation
LM2594 LM2594HV 01243907.png Figure 4. Switch Saturation Voltage
LM2594 LM2594HV 01243909.png Figure 6. Dropout Voltage
LM2594 LM2594HV 01243911.png Figure 8. Standby Quiescent Current
LM2594 LM2594HV 01243913.png Figure 10. ON/OFF Threshold Voltage
LM2594 LM2594HV 01243915.png Figure 12. Switching Frequency