Datasheet Linear Technology LTC3835

Manufacturer	Linear Technology
Series	LTC3835

Low I_Q Synchronous Step-Down Controller

Datasheets

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PDF, 423 Kb, Revision: E, File uploaded: Sep 23, 2017

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Packaging

	LTC3835EFE#PBF	LTC3835EFE#TRPBF	LTC3835EUFD#PBF	LTC3835EUFD#TRPBF	LTC3835IFE#PBF	LTC3835IFE#TRPBF	LTC3835IUFD#PBF	LTC3835IUFD#TRPBF
N	1	2	3	4	5	6	7	8
Package	TSSOP-20 Package Outline Drawing	TSSOP-20 Package Outline Drawing	4x5 QFN-20 Package Outline Drawing	4x5 QFN-20 Package Outline Drawing	TSSOP-20 Package Outline Drawing	TSSOP-20 Package Outline Drawing	4x5 QFN-20 Package Outline Drawing	4x5 QFN-20 Package Outline Drawing
Package Code	FE	FE	UFD	UFD	FE	FE	UFD	UFD
Package Index	05-08-1663 (CB)	05-08-1663 (CB)	05-08-1711	05-08-1711	05-08-1663 (CB)	05-08-1663 (CB)	05-08-1711	05-08-1711
Pin Count	20	20	20	20	20	20	20	20

Parametrics

Parameters / Models	LTC3835EFE#PBF	LTC3835EFE#TRPBF	LTC3835EUFD#PBF	LTC3835EUFD#TRPBF	LTC3835IFE#PBF	LTC3835IFE#TRPBF	LTC3835IUFD#PBF	LTC3835IUFD#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC967B	DC967B	DC967B	DC967B	DC967B	DC967B	DC967B	DC967B
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File
Export Control	no	no	no	no	no	no	no	no
Features	Burst Mode, Tracking, External Synchronization, PLL, Power Good	Burst Mode, Tracking, External Synchronization, PLL, Power Good	Burst Mode, Tracking, External Synchronization, PLL, Power Good	Burst Mode, Tracking, External Synchronization, PLL, Power Good	Burst Mode, Tracking, External Synchronization, PLL, Power Good	Burst Mode, Tracking, External Synchronization, PLL, Power Good	Burst Mode, Tracking, External Synchronization, PLL, Power Good	Burst Mode, Tracking, External Synchronization, PLL, Power Good
Frequency, kHz	650	650	650	650	650	650	650	650
Frequency Sync Range	140kHz - 650kHz	140kHz - 650kHz	140kHz - 650kHz	140kHz - 650kHz	140kHz - 650kHz	140kHz - 650kHz	140kHz - 650kHz	140kHz - 650kHz
Integrated Inductor	no	no	no	no	no	no	no	no
Ishutdown, µA	10	10	10	10	10	10	10	10
Isupply, mA	0.08	0.08	0.08	0.08	0.08	0.08	0.08	0.08
Max Phases	1	1	1	1	1	1	1	1
Monolithic	no	no	no	no	no	no	no	no
Number of Outputs	1	1	1	1	1	1	1	1
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
Polyphase	no	no	no	no	no	no	no	no
Sense Resistor	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense
Switch Current, A	20	20	20	20	20	20	20	20
Synchronous	yes	yes	yes	yes	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Vin Max, V	36	36	36	36	36	36	36	36
Vin Min, V	4	4	4	4	4	4	4	4
Vout Max, V	10	10	10	10	10	10	10	10
Vout Maximum	10V	10V	10V	10V	10V	10V	10V	10V
Vout Min, V	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
Vref Accuracy Over Temp, %	1	1	1	1	1	1	1	1

Eco Plan

	LTC3835EFE#PBF	LTC3835EFE#TRPBF	LTC3835EUFD#PBF	LTC3835EUFD#TRPBF	LTC3835IFE#PBF	LTC3835IFE#TRPBF	LTC3835IUFD#PBF	LTC3835IUFD#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Design Notes

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80ВµA Quiescent Current Synchronous Step-Down Controller Extends Battery Life in Automotive Applications &mdash DN1014
PDF, 103 Kb, File published: Dec 18, 2006
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advertisement 80ВµA Quiescent Current Synchronous Step-Down Controller Extends Battery Life in Automotive Applications вЂ“ Design Note 1014
Julian Zhu Introduction
Battery powered applications that have a signiп¬Ѓcant
amount of time in standby mode, require electrical circuits
to operate with a low quiescent current to preserve battery life. The LTC3835 synchronous step-down controller
is an excellent solution with its ultralow quiescent current (80ВµA). Other features make it uniquely qualiп¬Ѓed to
satisfy the needs of automotive applications. A wide 4V
to 36V input voltage range protects the supply against
high input voltage transients and is compatible with low
voltage cold crank conditions. The constant frequency
current-mode architecture with high-side inductor current sensing provides excellent line and load regulation
and reliable current limiting and sharing. The 0.8V to
10V output voltage range provides п¬‚exibility for a variety
of applications. Solution size is small due to the 650kHz
switching frequency, which reduces external component
sizes, and the integrated synchronous FET driver, which
keeps component count low. Furthermore, the LTC3835
provides high efп¬Ѓciency over a wide load range up to 20A.
Other important features include:
CLKOUT The output voltage can be ramped during start-up with
an adjustable soft-start or it can track an external ramp
signal. The controller can be synchronized to an external clock
via a phase-locked loop. The CLKOUT pin and current mode control allow interleaved operation of multiple parallel controllers for …

Model Line

Series: LTC3835 (8)

LTC3835EFE#PBF LTC3835EFE#TRPBF LTC3835EUFD#PBF LTC3835EUFD#TRPBF LTC3835IFE#PBF LTC3835IFE#TRPBF LTC3835IUFD#PBF LTC3835IUFD#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > Micropower Buck Regulators | External Power Switch Buck Controllers