ОПИСАНИЕ

Dual 18A or Single 36A DC/DC µModule Regulator

The LTM®4630 is a dual 18A or single 36A output switching mode step-down DC/DC µModule® (micromodule) regulator. Included in the package are the switching controllers, power FETs, inductors, and all supporting components. Operating from an input voltage range of 4.5V to 15V, the LTM4630 supports two outputs each with an output voltage range of 0.6V to 1.8V, each set by a single external resistor. Its high efficiency design delivers up to 18A continuous current for each output. Only a few input and output capacitors are needed. The LTM4630 is pin compatible with the LTM4620 and LTM4620A (dual 13A, single 26A) and the LTM4628 (dual 8A, single 16A).

The device supports frequency synchronization, multiphase operation, Burst Mode operation and output voltage tracking for supply rail sequencing and has an onboard temperature diode for device temperature monitoring. High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. Fault protection features include overvoltage and overcurrent protection. The LTM4630IV#PBF is offered in 16mm × 16mm × 4.41mm LGA packages. The LTM4630 is ROHS compliant.

The LTM4630 has dual integrated constant-frequency current mode regulators and built-in power MOSFET devices with fast switching speed. The typical switching frequency is 500kHz. For switching-noise sensitive applications, it can be externally synchronized from 400kHz to 780kHz. A resistor can be used to program a free run frequency on the FSET pin.With current mode control and internal feedback loop compensation, the LTM4630 module has sufficient stability margins and good transient performance with a wide range of output capacitors, even with all ceramic output capacitors.

Current mode control provides cycle-by-cycle fast current limit and foldback current limit in an overcurrent condition. Internal overvoltage and undervoltage comparators pull the open-drain PGOOD outputs low if the output feedback voltage exits a ±10% window around the regulation point. As the output voltage exceeds 10% above regulation, the bottom MOSFET will turn on to clamp the output voltage. The top MOSFET will be turned off. This overvoltage protect is feedback voltage referred.

 

ОСОБЕННОСТИ

Dual 18A or Single 36A Output

Wide Input Voltage Range: 4.5V to 15V

Output Voltage Range: 0.6V to 1.8V

±1.5% Maximum Total DC Output Error Over Line, Load and Temperature

Дифференциальный усилитель дистанционного зондирования

Управление в режиме тока/быстрая переходная характеристика

Adjustable Switching Frequency

Overcurrent Foldback Protection

Multiphase Parallel Current Sharing with Multiple LTM4630s Up to 144A

Синхронизация по частоте

Internal Temperature Monitor

Pin Compatible with the LTM4620 and LTM4620A (Dual 13A, Single 26A) and LTM4628 (Dual 8A, Single 16A)

Selectable Burst Mode® Operation

Плавный пуск/отслеживание напряжения

Output Overvoltage Protection

16mm × 16mm × 4.41mm LGA Packages

TJMAX = 125°C, ΘJA = 7°C/W, ΘJCbottom = 1.5°C/W, ΘJCtop = 3.7°C/W, ΘJB + ΘJBA ≅ 7°C/W Θ VALUES DEFINED PER JESD 51-12

WEIGHT = 3.2g

 

ПРИЛОЖЕНИЯ

Telecom and Networking Equipment

Storage and ATCA Cards

Промышленное оборудование

 

ПРИМЕЧАНИЕ К ЭЛЕКТРИЧЕСКИМ ХАРАКТЕРИСТИКАМ

Примечание 1: Нагрузки, превышающие указанные в разделе "Абсолютные максимальные номинальные значения", могут привести к необратимому повреждению устройства. Длительное пребывание в условиях абсолютного максимума может повлиять на надежность и срок службы устройства.

Note 2: The LTM4630 is tested under pulsed load conditions such that TJ ≈ TA. The LTM4630E is guaranteed to meet specifications from 0°C to 125°C internal temperature. Specifications over the –40°C to 125°C internal operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM4630I is guaranteed over the full –40°C to 125°C internal operating temperature range. Note that the maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal impedance and other environmental factors.

Note 3: Two outputs are tested separately and the same testing condition is applied to each output.

Note 4: The switching frequency is programmable from 400kHz to 750kHz.

Note 5: LTM4630 device is designed to operate from 400kHz to 750kHz

Note 6: These parameters are tested at wafer sort.

Note 7: See output current derating curves for different VIN, VOUT and TA.