Datasheet Linear Technology LT3999EDD#PBF

Manufacturer	Linear Technology
Series	LT3999
Part Number	LT3999EDD#PBF

Low Noise, 1A, 1MHz Push-Pull DC/DC Driver with Duty Cycle Control

Datasheets

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PDF, 310 Kb, Language: en, File uploaded: Sep 19, 2017, Pages: 16
Low Noise, 1A, 1MHz Push-Pull DC/DC Driver with Duty Cycle Control

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Prices

Packaging

Package	3x3 DFN-10
Package Code	DD
Package Index	05-08-1699

Parametrics

Demo Boards	DC2049A
Design Tools	LTspice Model
Export Control	no
Features	Low EMI, Resistor Set Frequency, External Synchronization
Frequency	1000 kHz
Frequency Adjust Range	50kHz - 1MHz
Frequency Sync Range	50kHz - 1MHz
Integrated Inductor	no
Ishutdown	0.1 µA
Isupply	4.3 mA
Max Phases	1
Monolithic	yes
Number of Outputs	1
Operating Temperature Range	0 to 85 °C
Output Current	1 A
Polyphase	no
Switch Current	1.4 A
Synchronous	no
Topology	Push-Pull
Vin Max	36 V
Vin Min	2.7 V

Eco Plan

RoHS

Compliant

Articles

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How to Design an Isolated, High Frequency, Push-Pull DC/DC Converter &mdash LT Journal
PDF, 931 Kb, File published: Apr 7, 2015
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design ideas How to Design an Isolated, High Frequency, Push-Pull
DC/DC Converter
Dawson Huang A simple push-pull DC/DC converter with a fixed 50% duty cycle is often used as a low
noise transformer driver in communication systems, medical instruments and distributed
power supplies. This simple scheme provides no voltage regulationвЂ”requiring a low
dropout (LDO) post regulatorвЂ”a combination that presents potentially serious problems.
First, any significant variation in the driverвЂ™s input voltage, along with the fixed 50% duty
cycle, can increase the differential voltage across the LDO, resulting in significant power
losses and high temperature rise in the LDO. Second, low switching frequency requires
relatively bulky transformers, sometimes occupying 30% to 50% of the converter space.
The LT3999 monolithic DC/DC push-pull
driver avoids these issues with two important features: duty cycle control and high
frequency operation: Duty cycle control allows compensation
for wide VIN variationвЂ”something standard fixed duty cycle transformer drivers cannot doвЂ”greatly reducing LDO
loss when facing a wide input range. High switching frequency, up to
1MHz , leads to smaller transformers and lower output ripple. wide input range, the other for a
compact high frequency transformer
driver with fixed input voltage. The LT3999 combines these two
features with high 36V input voltage
and 1A input current capabilities,
making it a high power and flexible
low noise push-pull converter IC. PUSH-PULL DC/DC CONVERTER
DESIGN FOR WIDE RANGING INPUT This article presents two step-bystep design procedures: One for a …

Model Line

Series: LT3999 (12)

LT3999EDD#PBF LT3999EDD#TRPBF LT3999EMSE#PBF LT3999EMSE#TRPBF LT3999HMSE#PBF LT3999HMSE#TRPBF LT3999IDD#PBF LT3999IDD#TRPBF LT3999IMSE#PBF LT3999IMSE#TRPBF LT3999MPMSE#PBF LT3999MPMSE#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Ultralow Noise Regulators | Flyback, Forward and Isolated Controllers
Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators

Other Names:

LT3999EDDPBF, LT3999EDD PBF