SLOSEB6D February   2025  – November 2025 LMH13000

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics for Low-Current Mode, MODE = 0
    6. 5.6 Electrical Characteristics for High-Current Mode, MODE = 1
    7. 5.7 Typical Characteristics
    8. 5.8 Parameter Measurement Information
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Constant Current (ICC)
      2. 6.3.2 Propagation Delay With Temperature
        1. 6.3.2.1 Calibration of Propagation Delay With Temperature
        2. 6.3.2.2 Start Pulse Directly From IOUT
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Optical Time-of-Flight System
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curve
      2. 7.2.2 Automatic Power-Control Loop Using the LMH13000
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RQE|13
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3.1 Constant Current (ICC)

The LMH13000 is designed to provide a parallel constant current (ICC) at the IOUT. This constant current is in addition to the current set by the VSET. ICC is adjusted by selecting an appropriate RBIAS resistor.

Equation 1. I C C   =   100 R B I A S  

ICC can be set from 4mA to 200mA; IOUT(TOTAL) = ICC, when LVDS = 0 and PD = 0.

For example:

  • For RBIAS = 25kΩ; ICC = 4mA
  • For RBIAS = 500Ω; ICC = 200mA

LMH13000 Circuit for Dynamic ICC Control Figure 6-1 Circuit for Dynamic ICC Control

Figure 6-1 shows that the output current IOUT(TOTAL) is the sum of ICC (set by RBIAS) and IOUT which depends on the VSET.

Equation 2. I O U T ( T O T A L )   =   I C C   +   I O U T

Disable ICC by shorting the RBIAS pin to AVDD. ICC does not depend on the LVDS input. However, during PD = 1 (power-down state), ICC is internally turned off irrespective of the RBIAS value. ICC enables the application to keep a constant current flowing though the connected load. With applications such as laser diode driving, a small bias current such as that of ICC helps improve the optical turn-on time.

Figure 6-1 shows how ICC is dynamically changed by connecting a DAC on the other end of Rfixed resistor.

Equation 3 gives the relation between ICC and VDAC for a given Rfixed resistor connect to RBIAS pin.

Equation 3. I C C   =   200   ×   ( 0.5   –   V D A C R f i x e d )