LTM4709
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LTM4709

Triple 3A, Ultralow Noise, High PSRR, Ultrafast μModule Linear Regulator with Configurable Output Array

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 3
1ku List Price Starting From $16.23
Features
  • Linear Regulator μModule® with Triple 3A Output
  • Input Voltage: 0.6V to 5.5V
  • Configurable Output Voltage: 0.5V to 4.2V
  • Ultralow RMS Noise: 1.3μVRMS (10Hz to 100kHz)
  • High Frequency PSRR: 51dB at 1MHz
  • Low Dropout Voltage: 45mV Typical at 3A
  • Ultrafast Transient Response
  • 50% Smaller Than Discrete Solutions
  • ±1.5% Output Voltage Regulation Over Line, Load, and Temperature
  • ±2.4% Precision Current Monitor Accuracy at 3A
  • Stable with Ceramic Output Capacitors (10μF Minimum)
  • Parallel Multiple Devices for Higher Current
  • PG Flag, UVLO, Overcurrent and Overtemperature Protection
  • 150°C Rated Available
  • 6mm × 12mm × 1.92mm BGA Package
Additional Details
show more Icon

The LTM4709 is a low voltage, triple 3A μModule linear regulator offering a high power supply rejection ratio (PSRR), ultralow noise, and ultrafast transient response. The μModule regulator includes low dropout linear regulators (LDO), capacitors, and resistors. Operating over an input voltage range of 0.6V to 5.5V, the LTM4709 supports an output voltage range of 0.5V to 4.2V for triple 3A channels with a typical dropout voltage of 45mV. The output voltage is digitally configurable in 50mV increments from 0.5V to 1.2V; 100mV increments from 1.2V to 1.8V; and discrete levels at 2V, 2.5V, 3V, 3.3V, and 4.2V. A precision current monitor provides accurate current monitoring for the energy management system and current limit. The LTM4709 is ideal for RF communication, noise-sensitive instrumentation, post-regulation for switching regulators, high-performance FPGAs, and microprocessors. Only input, output, and bias ceramic capacitors are needed for its application.

Fault protection features include UVLO, power good, overcurrent, and overtemperature protection. The LTM4709 is offered in 6mm × 12mm × 1.92mm, 98-pin BGA package with 0.8mm ball pitch.

APPLICATIONS

  • RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
  • High Speed/High Precision Data Converter
  • FPGA, DSP, and Microprocessor Power Supplies
  • High-Speed Servers and Storage Devices
  • Medical and Healthcare
  • Very-Low-Noise Instrumentation
  • Post-Regulation for Switching Supplies
Part Models 3
1ku List Price Starting From $16.23

close icon
Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTM4709EY#PBF
  • HTML
  • HTML
LTM4709HY#PBF
  • HTML
  • HTML
LTM4709IY#PBF
  • HTML
  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

DC3211A

LTM4709 | Triple 3A, Ultralow Noise, High PSRR, Ultrafast μModule Linear Regulator with Configurable Output Array

zoom

DC3211A

LTM4709 | Triple 3A, Ultralow Noise, High PSRR, Ultrafast μModule Linear Regulator with Configurable Output Array

LTM4709 | Triple 3A, Ultralow Noise, High PSRR, Ultrafast μModule Linear Regulator with Configurable Output Array

Product Detail

Demonstration circuit 3211A features the LTM4709, a triple 3A, ultralow noise, high PSRR, and ultrafast μModule® linear regulator with a configurable output array. The input voltage (VINn) range is from 0.6V to 5.5V. There are jumpers to set a 3-bit trilevel code that determines the output voltage (VOUTn) at preprogrammed levels that range from 0.5V to 4.2V. The maximum output current per channel is 3A. The DC3211A requires an external BIAS voltage (VBIASn) at least 1.2V higher than VOUTn and between 2.375V and 5.5V.

The LTM4709 of the DC3211A requires few external components, therefore, simplifying the circuit design and significantly reducing solution size. External component choice and carefully printed circuit board (PCB) design help optimize noise, Power Supply Rejection Ratio (PSRR), load transient response, and VOUTn regulation performance. The LTM4709 only requires ceramic capacitors for the power input and the power output. The 22μF capacitor at the circuit output was chosen for high frequency PSRR performance and to minimize VOUTn deviation during load transients.

The capacitor that bypasses the VINn power for the LTM4709 and the corresponding VINn PCB layout can affect PSRR (see the Best PSRR Performance: PCB Layout for Input Traces section for additional information). The DC3211A decouples the VINn power with a 4.7μF capacitor (see the LTM4709 data sheet for the minimum capacitor value required for VINn). Note that an optional bulk 220μF tantalum polymer capacitor further reduces VINn variation during load transients and reduces input voltage ringing that can be caused by inductive input power leads.

The LTM4709 has a precision current monitor that provides accurate current monitoring for the energy management system and current limit. An IMONn terminal is available for the current monitoring of each channel. The IMONn voltage is the product of the resistance that programs the current limit and the IMONn pin current, which is 1/3000 of the output current. By default, the DC3211A has a 3.3A current limit per channel with IMONRn tied to GND. However, custom current limit levels can be programmed by floating IMONRn and connecting a resistor from IMONn to GND. The externally programmed current limit is triggered when the IMONn voltage is 1V.

ENn jumpers (JP1, JP2, JP3) are available on the DC3211A to either connect each channel’s ENn pin to VBIASn to turn the output on or to ground to disable the output. There is a PGn terminal for each channel that is pulled up to VBIASn by a 100k resistor when PGRn is connected to BIAS. PGn is pulled down by an open-drain, n-channel metal-oxide semiconductor (nMOS) output for indication of regulator output status, and other fault modes. The voltage input-to-output control (VIOC1) terminal allows connections for automatically regulating the difference between the input voltage and output voltage of the LTM4709 to be a fixed value.

The LTM4709 data sheet must be read in conjunction with this demo manual before working on or modifying demonstration circuit DC3211A.

reference details image

EVAL-LTM4709-BZ

Single 9A, Ultralow Noise, High PSRR, Ultrafast μModule Linear Regulator with Configurable Output Array

zoom

EVAL-LTM4709-BZ

Single 9A, Ultralow Noise, High PSRR, Ultrafast μModule Linear Regulator with Configurable Output Array

Single 9A, Ultralow Noise, High PSRR, Ultrafast μModule Linear Regulator with Configurable Output Array

Product Detail

The EVAL-LTM4709-BZ evaluation board features the LTM®4709, a triple 3A, ultralow noise, high power supply rejection ratio (PSRR), and ultrafast μModule® linear regulator with a configurable output array. The input voltage (VIN) ranges from 0.6V to 5.5V. There are jumpers to set a 3-bit trilevel code that determines the output voltage (VOUT) at preprogrammed levels that range from 0.5V to 4.2V. The maximum output current is 9A since the LTM4709 is configured as a single output. The EVAL-LTM4709-BZ requires an external BIAS voltage (VBIAS) at least 1.2V higher than VOUT and between 2.375V and 5.5V.

The LTM4709 of the EVAL-LTM4709-BZ requires few external components, therefore simplifying the circuit design and significantly reducing solution size. External component choice and careful PCB design help optimize noise, PSRR, load transient response, and VOUT regulation performance. The LTM4709 only requires ceramic capacitors for the power input and the power output. The 22μF capacitor at the circuit output was chosen for high-frequency PSRR performance and to minimize VOUT deviation during load transients.

The capacitor that bypasses the VIN power for the LTM4709 and the corresponding VIN PCB layout can affect PSRR (see the Best PSRR Performance: PCB Layout for Input Traces section for additional information). The EVAL-LTM4709-BZ decouples the VIN power with a 4.7μF capacitor (see the LTM4709 data sheet for the minimum capacitor value required for VIN). Note that an optional bulk 220μF tantalum polymer capacitor further reduces VIN variation during load transients and reduces input voltage ringing that can be caused by inductive input power leads.

The LTM4709 has a precision current monitor that provides accurate current monitoring for the energy management system and current limit. An IMONn terminal is available for the current monitoring of each channel. The IMONn voltage is the product of the resistance that programs the current limit and the IMONn pin current, which is 1/3000 of the output current. By default, the EVAL-LTM4709-BZ has a 3.3A current limit per channel with IMONRn tied to GND. However, custom current limit levels can be programmed by floating IMONRn and connecting a resistor from IMONn to GND. The externally programmed current limit is triggered when the IMONn voltage is 1V. An EN jumper (P17) is available on the EVAL-LTM4709-BZ to either connect the ENn pins to VBIAS to turn the output on or to ground to disable the output. There is a PGn terminal for each channel that is pulled up to VBIAS by a 100kΩ resistor when PGRn is connected to BIAS. PGn is pulled down by an open-drain, n-channel metal-oxide semiconductor (nMOS) output to indicate regulator output status and other fault modes. The voltage input-to-output control (VIOC1) terminal allows connections to automatically regulate the difference between the input voltage and output voltage of the LTM4709 to be a fixed value.

For applications that require multiple outputs, each channel of the LTM4709 can be standalone. The DC3211A board is an example of a triple 3A application for the LTM4709.

The LTM4709 data sheet must be read in conjunction with this demo manual before working on or modifying the EVAL-LTM4709-BZ.

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Recently Viewed