Silent Switcher 2
100
95
90
85
80
Efficiency (%)
75
70
65
60
55
50
45
40
0
1
2
V
IN1
= V
IN2
= 12 V
f
SW
= 2 MHz
3
4
Load Current (A)
CH1 5 V
CH2 3.3 V
5
6
High Efficiency • High Frequency • Low EMI
Part Number
65 V
IN(MAX)
LT8641
LT8645S/LT8646S
LT8645S-2
42 V
IN(MAX)
LT8606
LT8607
LT8608
LT8609S
LT8609A
LT8614
LT8653S
LT8640/LT8640-1
LT8640S
LT8643S
LT8650S
LT8636
LT8648S
18 V
IN(MAX)
LT8642S
LTC7151S
LTC7150S
LT8652S
5 V
IN(MAX)
LTC3307A/
LTC3308A/
LTC3309A
LTC3310S
Silent Switcher
®
Silent Switcher 2
Silent Switcher 2
Low EMI
Low EMI
Low EMI
Silent Switcher 2
Low EMI
Silent Switcher
Silent Switcher 2
Silent Switcher
Silent Switcher 2
Silent Switcher 2
Silent Switcher 2
Silent Switcher
Silent Switcher 2
Silent Switcher 2
Silent Switcher 2
Silent Switcher 2
Silent Switcher 2
3.0 to 65
3.4 to 65
3.4 to 65
3.0 to 42
3.0 to 42
3.0 to 42
3.0 to 42
3.0 to 42
3.4 to 42
3.0 to 42
3.4 to 42
3.4 to 42
3.4 to 42
3.0 to 42
3.4 to 42
3.0 to 42
2.8 to 18
3.1 to 20
3.1 to 20
3.0 to 18
3.5 A
8A
8A
350 mA
750 mA
1.5 A
2 A/3 A peak
2 A/3 A peak
4A
2 × 2 A/3 A peak
5 A/7 A peak
5 A/7 A peak
5 A/7 A peak
2 × 4 A/6 A peak
5 A/7 A peak
15 A
10 A
15 A
20 A
2 × 8 A
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.97
0.8
0.97
0.97
0.97
0.8
0.97
0.6
0.6
0.6
0.6
0.6
200 kHz to 3 MHz
200 kHz to 2.2 MHz
200 kHz to 2.2 MHz
200 kHz to 2.2 MHz
200 kHz to 2.2 MHz
200 kHz to 2.2 MHz
200 kHz to 2.2 MHz
200 kHz to 2.2 MHz
200 kHz to 2.2 MHz
200 kHz to 3 MHz
200 kHz to 3 MHz
200 kHz to 3 MHz
200 kHz to 3 MHz
200 kHz to 3 MHz
200 kHz to 3 MHz
200 kHz to 3 MHz
200 kHz to 3 MHz
400 kHz to 3 MHz
400 kHz to 3 MHz
300 kHz to 3 MHz
2.5 µA
2.5 µA
2.5 µA
3 µA
3 µA
2.5 µA
2.5 µA
2.5 µA
2.5 µA
6 µA
2.5 µA
2.5 µA
230 µA
6.2 µA
2.5 µA
6 µA
240 µA
2 mA
2 mA
6 µA
3 × 4, 18-lead QFN
4 × 6, 32-lead LQFN
4 × 6, 32-lead LQFN
2 × 2 DFN, 10-lead MSOP-EP
2 × 2 DFN, 10-lead MSOP-EP
2 × 2 DFN, 10-lead MSOP-EP
3 × 3, 16-lead LQFN
3 × 3 DFN, 10-lead MSOP-EP
3 × 4, 18-lead QFN
3 × 4, 20-lead LQFN
3 × 4, 18-lead QFN
4 × 4, 24-lead LQFN
4 × 4, 24-lead LQFN
4 × 6, 32-lead LQFN
4 × 3, 24-lead LQFN
4 × 7, 36-lead LQFN
4 × 4, 24-lead LQFN
4 × 5, 28-lead LQFN
5 × 6, 42-ball BGA
4 × 7, 36-lead LQFN
Silent Switcher
Family
V
IN
Range
(V)
I
OUT
V
OUT(MIN)
(V)
Frequency
I
Q
Package
(mm)
Efficiency: 95% Efficient at 2 MHz
50
45
40
Amplitude (dBµV/m)
35
30
25
20
15
10
5
0
–5
–10
–15
0
100
200
300
400
500
LT8650S
LT8650S
CISPR 25, CLASS 5 Limit
CISPR 25, CLASS 5 Limit
600
700
800
900
1000
Silent Switcher
Silent Switcher 2
2.25 to 5.5
2.25 to 5.5
3
A/4 A/6 A
10
A
0.5
0.5
1 MHz to 3 MHz
500 kHz to 5 MHz
45
µA
1.3 mA
2 × 2, 12-lead LQFN
3 × 3, 18-lead LQFN
Frequency (MHz)
LT8650S EMI/EMC Curve 5 V at 3.8 A, 3.3 V at 4.2 V,
f
SW
= 2 MHz with Spread Spectrum
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ANALOG.COM
Easy PCB layout
OUT1
6.2 µA I
Q
200 kHz to 3 MHz
LTC8650S
OUT2
94.4% Efficiency
at 2 MHz
2 × 4 A
OUT
CISPR 25 Class 5
Silent Switcher 2 Technology’s Unrivaled Ease of Use
Faster • Smaller • Quieter
The
LT8650S
combines high efficiency at high frequencies and an ultralow EMI design to deliver a very compact dual output 4 A (6 A peak) synchronous step-down solution. It delivers efficiency as high as 94.4% (12 V
IN
to
5 V
OUT
) with a switching frequency of 2 MHz offering a very compact solution footprint. The LT8650S’s unique Silent Switcher 2 architecture uses four internal input capacitors as well as internal BST and INTV
CC
capacitors
to minimize the area of the hot loops. Additionally, its fast, clean, low overshoot switching edges enable both high efficiency operation, at high switching frequencies and low EMI/EMC emissions. The internal construction
uses copper pillars in lieu of bond wires and an integrated ground plane to further reduce EMI/EMC emissions. This improved EMI/EMC performance is not sensitive to PCB layout, simplifying design and reducing risk
even when using two layer PCBs. The LT8650S can easily pass the automotive CISPR 25, Class 5 peak EMI limits with a 2 MHz switching frequency over its entire load range. Spread spectrum frequency modulation is also
available to further lower EMI/EMC levels.
X
X
X
4 A from each channel simultaneously
Up to 6 A on either channel
Silent Switcher architecture:
■
Ultralow EMI/EMC emissions on any PCB
■
Eliminates PCB layout sensitivity
■
Internal bypass capacitors reduce radiated EMI
■
Optional spread spectrum modulation
X
X
94.4% efficiency at 2 MHz
Ultralow quiescent current Burst Mode
®
operation:
■
6.2 μA I
Q
, output ripple <10 mV p-p
X
X
X
X
Fast minimum switch-on time: 40 ns
Adjustable and synchronizable: 300 kHz to 3 MHz
Output soft start and tracking
Small thermally enhanced 4 mm × 6 mm, 32-lead LGA package
X
Wide input voltage range: 3.0 V to 42 V
LT8650S Demo Board (DC2407A)
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