Datasheet Linear Technology LT8650S

Manufacturer	Linear Technology
Series	LT8650S

Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current

Datasheets

PDF, 1.5 Mb, File uploaded: Oct 20, 2017

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Packaging

	LT8650SEV#PBF	LT8650SIV#PBF
N	1	2
Package	6mm × 4mm × 0.94mm LQFN Package Outline Drawing	6mm × 4mm × 0.94mm LQFN Package Outline Drawing
Package Code	LQFN	LQFN
Package Index	05-08-1665	05-08-1665
Pin Count	32	32

Parametrics

Parameters / Models	LT8650SEV#PBF	LT8650SIV#PBF
Architecture	Constant Frequency Peak Current Mode	Constant Frequency Peak Current Mode
Demo Boards	DC2407A	DC2407A
Design Tools	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model
Export Control	no	no
Features	Low EMI, Silent Switcher 2 Architecture, Burst Mode, Resistor Set Frequency, External Synchronization, PolyPhase	Low EMI, Silent Switcher 2 Architecture, Burst Mode, Resistor Set Frequency, External Synchronization, PolyPhase
Frequency, kHz	3000	3000
Frequency Adjust Range	300kHz - 3MHz	300kHz - 3MHz
Frequency Sync Range	300kHz - 3MHz	300kHz - 3MHz
Integrated Inductor	no	no
Ishutdown, µA	1.7	1.7
Isupply, mA	0.0037	0.0037
Max Phases	2	2
Monolithic	yes	yes
Number of Outputs	2	2
Operating Temperature Range, °C	0 to 85	-40 to 85
Output Current, A	4	4
Output Current 2, A	4	4
Polyphase	yes	yes
Switch Current, A	8.5	8.5
Switch Current 2, A	8.5	8.5
Synchronous	yes	yes
Topology	Buck	Buck
Topology 1	Buck	Buck
Topology 2	Buck	Buck
Vin Max, V	42	42
Vin Min, V	3	3
Vout Max, V	41.58	41.58
Vout Max 2, V	41.58	41.58
Vout Maximum	0.99Vin	0.99Vin
Vout Min, V	0.8	0.8
Vout Min 2, V	0.8	0.8
Vref Accuracy Over Temp, %	1.25	1.25

Eco Plan

	LT8650SEV#PBF	LT8650SIV#PBF
RoHS	Compliant	Compliant

Design Notes

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Dual Channel 42V, 4A Monolithic Synchronous Step-Down Silent Switcher 2 with 6.2ОјA Quiescent Current &mdash DN1044
PDF, 403 Kb, File published: Nov 14, 2017
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Design Note
Dual Channel 42V, 4A Monolithic Synchronous Step-Down Silent
Switcher 2 with 6.2ВµA Quiescent Current
Hua (Walker) Bai
Introduction
The LTВ®8650S 42V, dual channel, 4A, synchronous Silent
SwitcherВ®2 regulator features a wide input voltage range of
3V to 42V, ideal for automotive, industrial and other stepdown applications. Its quiescent current is only 6.2ВµA, with
the outputs in regulation, a critical feature in automotive
environments, where always-on systems can drain the
battery even when the car is not running. EMI can be, and
a problem if overlooked in the board layout. The Silent
Switcher 2 design of the LT8650S can save the day when
it comes to passing stringent automotive EMI standards,
since layout becomes less critical than in other designs. excursions. Switching is at 2MHz, which allows higher loop
bandwidth and faster transient response.
Figure 2 shows the output response to a 0A to 4A load step,
where VOUT drops less than 100mV for both the 3.3V and
7.5V outputs. This response is combined with high initial
accuracy for a solution that meets tight VOUT tolerances. 3.3V OUTPUT (AC)
100mV/DIV
7.5V OUTPUT (AC)
100mV/DIV 7.5V/4A and 3.3V/4A Outputs Have Fast Transient …

Articles

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High Power Monolithic Silent Switcher 2 Regulators Meet CISPR 25 Class 5 EMI, Fit Tight Spaces &mdash LT Journal
PDF, 3.5 Mb, File published: Jan 3, 2018
Extract from the document
Journal of Power Management
January 2018 I N T H I S Volume 1 Number 1
I S S U E 2MHz buck-boost controller
drives LED headlight
cluster, meets CISPR 25
Class 5 EMI 11 the refulator: precision
voltage reference is High Power Monolithic Silent
Switcher 2 Regulators Meet CISPR
25 Class 5 EMI, Fit Tight Spaces
Hua (Walker) Bai, Dong Wang and Ying Cheng an accurate low noise
regulator for 200mA loads
17 in your pocket white noise
generator for quickly
testing circuit signal
response 26 As the quantity of electronic systems in automobiles multiplies, so
does the risk of intra-vehicle electromagnetic interference. For this
reason, electronics in modern vehicles often must meet the CISPR
25 Class 5 test standard, which stringently limits conducted and
radiated emissions. Switching power supplies, by their very nature,
are rife with EMI, and proliferate throughout an automobile. Low
EMI is now a key requirement for automobile power supplies, along
with small solution size, high
efficiency, thermal proficiency, …

Model Line

Series: LT8650S (2)

LT8650SEV#PBF LT8650SIV#PBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > Internal Power Switch Buck | Micropower Buck Regulators | High Input Voltage Buck
Power Management > Switching Regulator > Ultralow Noise Regulators

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