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PDF ISL78208 Data sheet ( Hoja de datos )
| Número de pieza | ISL78208 | |
| Descripción | Dual Standard Buck Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISL78208 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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Wide VIN Dual Standard Buck Regulator with 3A/3A
Continuous Output Current
ISL78208
The ISL78208 is a dual standard buck regulator capable of 3A
per channel with continuous output current. With an input
range of 4.5V to 28V, it provides a high frequency power
solution for a variety of point of load applications.
The PWM controller in the ISL78208 drives an internal
switching N-Channel power MOSFET and requires an external
Schottky diode to generate the output voltage. The integrated
power switch is optimized for excellent thermal performance
up to 3A of output current. The PWM regulator switches at a
default frequency of 500kHz and it can be user programmed
or synchronized from 300kHz to 2MHz. The ISL78208 utilizes
peak current mode control to provide flexibility in component
selection and minimize solution size. The protection features
include overcurrent, UVLO and thermal overload protection.
The ISL78208 is available in 5mmx5mm 32 Ld Wettable
Flank Quad Flat Pb-free (WFQFN) package.
The ISL78208 is rated for the automotive temperature range
(-40°C to +105°C).
Features
• Wide input voltage range from 4.5V to 28V
• Adjustable output voltage with continuous output current up
to 3A
• Current mode control
• Adjustable switching frequency from 300kHz to 2MHz
• Independent power-good detection
• Selectable In-phase or out-of-phase PWM operation
• Independent, sequential, ratiometric or absolute tracking
between outputs
• Internal 2ms Soft-start time
• Overcurrent/short circuit protection, thermal overload
protection, UVLO
• Boot undervoltage detection
• Qualified for automotive applications
• Pb-Free (RoHS compliant)
Applications
• DSP and embedded processor power supply
• Infotainment system power
100
90
80 12VOUT 1MHz
70
60
50
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT LOAD (A)
FIGURE 1. EFFICIENCY vs LOAD, VIN = 28V, TA = +25°C
July 29, 2014
FN8354.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2013, 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL78208
Typical Application Schematics
VOUT2
R5
25.5k
C4
68pF
R6
8.06k
C5
470pF
R8
69.8k
R2
8.06k
C2
470pF
R4
69.8k
R1
42.2k
C1
68pF
VOUT1
VOUT2
3A
VCC
VCC
VCC
L2
7µH
C13
47µF
D2
B340B
24
FS 30
SS2 23
SS1 2
PGOOD2 26
PGOOD1 31
PHASE2
18/19
C12
10nF
BOOT2 20
28
25
27
32
ISL78208
13 11 29 12
1
9/10 VIN1
15/16 VIN2
10µF
C72
6/7 PHASE1
C8
5 BOOT1 10nF
C71
20µF
L1
7µH
C9
D1 47µF
B340B
VOUT1
3A
4.7µF
FIGURE 2. DUAL 3A OUTPUT (VIN RANGE FROM 4.5V TO 28V)
VOUT1
R5
42.2k
C4 R7
68pF 0
FB2
C5
1nF
R6
8.06k
R8
34k
COMP2
FB2
Css2
47nF
VOUT1
Css1
47nF
VCC
24
FS 30
SS2 23
SS1 2
PGOOD2 26
PGOOD1 31
25
L2
C13 7µH
47µF
D2
B340B
PHASE2 18/19
C12
10nF
BOOT2
20
28
27
32
ISL78208
13 11 29 12
1
9/10 VIN1
VIN2
15/16
10µF C72
PHASE1
6/7
C8
5 BOOT1 10nF
C71
20µF
L1
7µH C9
D1 47µF
B340B
VOUT1
6A
4.7µF
FIGURE 3. SINGLE 6A OUTPUT (VIN RANGE FROM 4.5V TO 28V) CURRENT SHARING
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5
FN8354.1
July 29, 2014
5 Page 
ISL78208
Typical Performance CurvesTA
=
-40°C
to
+105°C,
unless
otherwise
noted.
Typical
values
Circuit of
are at TA =
F+i2gu5r°eC2. .(CVoINnt=in1u2eVd,)
VOUT1
=
5V,
VOUT2
=
3.3V,
IOUT1
=
3A,
IOUT2
=
3A,
LX1 5V/DIV
VOUT1 RIPPLE 20mV/DIV
IL1 0.2A/DIV
LX2 5V/DIV
VOUT2 RIPPLE 20mV/DIV
IL2 0.1A/DIV
FIGURE 16. STEADY STATE OPERATION AT NO LOAD CHANNEL 1
(VIN = 9V)
FIGURE 17. STEADY STATE OPERATION AT NO LOAD CHANNEL 2
LX1 5V/DIV
LX2 5V/DIV
VOUT1 RIPPLE 20mV/DIV
IL1 1A/DIV
VOUT2 RIPPLE 20mV/DIV
IL2 1A/DIV
FIGURE 18. STEADY STATE OPERATION WITH FULL LOAD CHANNEL 1
FIGURE 19. STEADY STATE OPERATION WITH FULL LOAD CHANNEL 2
LX2 10V/DIV
VOUT RIPPLE 20mV/DIV
LX1 10V/DIV
FIGURE 20. STEADY STATE OPERATION WITH FULL LOAD CURRENT
SHARING
Submit Document Feedback 11
VOUT1 RIPPLE 20mV/DIV
IL1 2A/DIV
FIGURE 21. LOAD TRANSIENT CHANNEL 1
FN8354.1
July 29, 2014
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ISL78208.PDF ] | |
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