Datasheet Linear Technology LTC3876

Manufacturer	Linear Technology
Series	LTC3876

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

Datasheets

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

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Packaging

	LTC3876EFE#PBF	LTC3876EFE#TRPBF	LTC3876EUHF#PBF	LTC3876EUHF#TRPBF	LTC3876IFE#PBF	LTC3876IFE#TRPBF	LTC3876IUHF#PBF	LTC3876IUHF#TRPBF
N	1	2	3	4	5	6	7	8
Package	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing
Package Code	FE	FE	UHF	UHF	FE	FE	UHF	UHF
Package Index	05-08-1772	05-08-1772	05-08-1701	05-08-1701	05-08-1772	05-08-1772	05-08-1701	05-08-1701
Pin Count	38	38	38	38	38	38	38	38

Parametrics

Parameters / Models	LTC3876EFE#PBF	LTC3876EFE#TRPBF	LTC3876EUHF#PBF	LTC3876EUHF#TRPBF	LTC3876IFE#PBF	LTC3876IFE#TRPBF	LTC3876IUHF#PBF	LTC3876IUHF#TRPBF
Architecture	Controlled On-Time Valley Current Mode	Controlled On-Time Valley Current Mode	Controlled On-Time Valley Current Mode	Controlled On-Time Valley Current Mode	Controlled On-Time Valley Current Mode	Controlled On-Time Valley Current Mode	Controlled On-Time Valley Current Mode	Controlled On-Time Valley Current Mode
Demo Boards	DC1631A	DC1631A	DC1631A	DC1631A	DC1631A	DC1631A	DC1631A	DC1631A
Design Tools	LTspice Model	LTspice Model	LTspice Model	LTspice Model	LTspice Model	LTspice Model	LTspice Model	LTspice Model
Export Control	no	no	no	no	no	no	no	no
Features	DDR Mode, Resistor Set Frequency, External Synchronization, Tracking, DCR Current Sense, Power Good	DDR Mode, Resistor Set Frequency, External Synchronization, Tracking, DCR Current Sense, Power Good	DDR Mode, Resistor Set Frequency, External Synchronization, Tracking, DCR Current Sense, Power Good	DDR Mode, Resistor Set Frequency, External Synchronization, Tracking, DCR Current Sense, Power Good	DDR Mode, Resistor Set Frequency, External Synchronization, Tracking, DCR Current Sense, Power Good	DDR Mode, Resistor Set Frequency, External Synchronization, Tracking, DCR Current Sense, Power Good	DDR Mode, Resistor Set Frequency, External Synchronization, Tracking, DCR Current Sense, Power Good	DDR Mode, Resistor Set Frequency, External Synchronization, Tracking, DCR Current Sense, Power Good
Frequency, kHz	2000	2000	2000	2000	2000	2000	2000	2000
Frequency Adjust Range	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz
Frequency Sync Range	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz	200kHz - 2MHz
Integrated Inductor	no	no	no	no	no	no	no	no
Ishutdown, µA	20	20	20	20	20	20	20	20
Isupply, mA	5	5	5	5	5	5	5	5
Max Phases	1	1	1	1	1	1	1	1
Monolithic	no	no	no	no	no	no	no	no
Number of Outputs	3	3	3	3	3	3	3	3
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85	0 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Output Current, A	20	20	20	20	20	20	20	20
Output Current 2, A	20	20	20	20	20	20	20	20
Output Current 3, A	0.050	0.050	0.050	0.050	0.050	0.050	0.050	0.050
Polyphase	no	no	no	no	no	no	no	no
Sense Resistor	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR
Switch Current, A	25	25	25	25	25	25	25	25
Switch Current 2, A	25	25	25	25	25	25	25	25
Synchronous	yes	yes	yes	yes	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 1	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 2	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 3	LDO	LDO	LDO	LDO	LDO	LDO	LDO	LDO
Vin Max, V	38	38	38	38	38	38	38	38
Vin Min, V	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5
Vout Max, V	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5
Vout Max 2, V	1.25	1.25	1.25	1.25	1.25	1.25	1.25	1.25
Vout Max 3, V	1.25	1.25	1.25	1.25	1.25	1.25	1.25	1.25
Vout Maximum	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V
Vout Min, V	1	1	1	1	1	1	1	1
Vout Min 2, V	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
Vout Min 3, V	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5

Eco Plan

	LTC3876EFE#PBF	LTC3876EFE#TRPBF	LTC3876EUHF#PBF	LTC3876EUHF#TRPBF	LTC3876IFE#PBF	LTC3876IFE#TRPBF	LTC3876IUHF#PBF	LTC3876IUHF#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	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