Datasheet Linear Technology LTC3876IUHF#PBF

Manufacturer	Linear Technology
Series	LTC3876
Part Number	LTC3876IUHF#PBF

Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and ±50mA VTT Reference

Datasheets

PDF, 640 Kb, File uploaded: Sep 24, 2017

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Packaging

Package	5x7 QFN-38
Package Code	UHF
Package Index	05-08-1701

Parametrics

Architecture	Controlled On-Time Valley Current Mode
Demo Boards	DC1631A
Design Tools	LTspice Model
Export Control	no
Features	DDR Mode, Resistor Set Frequency, External Synchronization, Tracking, DCR Current Sense, Power Good
Frequency	2000 kHz
Frequency Adjust Range	200kHz - 2MHz
Frequency Sync Range	200kHz - 2MHz
Integrated Inductor	no
Ishutdown	20 µA
Isupply	5 mA
Max Phases	1
Monolithic	no
Number of Outputs	3
Operating Temperature Range	-40 to 85 °C
Output Current	20 A
Output Current 2	20 A
Output Current 3	0.050 A
Polyphase	no
Sense Resistor	Rsense, DCR
Switch Current	25 A
Switch Current 2	25 A
Synchronous	yes
Topology	Buck
Topology 1	Buck
Topology 2	Buck
Topology 3	LDO
Vin Max	38 V
Vin Min	4.5 V
Vout Max	2.5 V
Vout Max 2	1.25 V
Vout Max 3	1.25 V
Vout Maximum	2.5V
Vout Min	1 V
Vout Min 2	0.5 V
Vout Min 3	0.5 V

Eco Plan

RoHS

Compliant

Design Notes

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Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and В±50mA VTT Reference &mdash DN503
PDF, 186 Kb, File published: May 2, 2012
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Dual DC/DC Controller for DDR Power with Differential VDDQ
Sensing and В±50mA VT T Reference
Design Note 503
Ding Li
Introduction
The LTC В®3876 is a complete DDR power solution,
compatible with DDR1, DDR2, DDR3 and DDR4 lower
voltage standards. The IC includes VDDQ and V TT DC/
DC controllers and a precision linear V TT reference.
A differential output sense ampliп¬Ѓer and precision
internal reference combine to offer an accurate VDDQ
supply. The V TT controller tracks the precision VTTR
linear reference with less than 20mV total error. The
precision VTTR reference maintains 1.2% regulation
accuracy, tracking one-half VDDQ over temperature for
a В±50mA reference load. High Efп¬Ѓciency, 4.5V to 14V Input, Dual Output
DDR Power Supply
Figure 1 shows a DDR3 power supply that operates
from a 4.5V to 14V input. Figure 2 shows efп¬Ѓciency
curves for discontinuous and forced continuous modes
of operation.
Load-Release Transient Detection
As output voltages drop, a major challenge for switching regulators is to limit the overshoot in VOUT during …

Model Line

Series: LTC3876 (8)

LTC3876EFE#PBF LTC3876EFE#TRPBF LTC3876EUHF#PBF LTC3876EUHF#TRPBF LTC3876IFE#PBF LTC3876IFE#TRPBF LTC3876IUHF#PBF LTC3876IUHF#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > DDR Memory/Bus Termination

Other Names:

LTC3876IUHFPBF, LTC3876IUHF PBF

EMS supplier

Slices

Microcontrollers