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PDF ISL9441 Data sheet ( Hoja de datos )
| Número de pieza | ISL9441 | |
| Descripción | (ISL9440 / ISL9441) Step-Down PWM and Single Linear Controller | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
ISL9440, ISL9440A, ISL9441
December 5, 2007
FN6383.1
Triple, 180° Out-of-Phase, Step-Down
PWM and Single Linear Controller
www.TdahteasIhSeLe9t44u4.0c,oImSL9440A and ISL9441 are quad-output
synchronous buck controllers that integrate 3 PWM
controllers and 1 low drop-out linear regulator controller, which
are full featured and designed to provide multi-rail power for
use in products such as cable and satellite set-top boxes,
VoIP gateways, cable modems, and other home connectivity
products as well as a variety of industrial and general purpose
applications. Each output is adjustable down to 0.8V. The
PWMs are synchronized at 180° out of phase thus reducing
the RMS input current and ripple voltage.
The ISL9440, ISL9440A and ISL9441 offer internal soft-start,
independent enable inputs for ease of supply rail
sequencing, and integrated UV/OV/OC/OT protections in a
space conscious 5mmx5mm QFN package. The ISL9440
and ISL9440A offer an early warning function to output a
logic signal to warn the system to back up data when input
voltage falls below a certain level.
The ISL9440, ISL9440A and ISL9441 utilize internal loop
compensation to keep minimum peripheral components for
compact design and a low total solution cost. These devices
are implemented with current mode control with feed forward
to cover various applications even with fixed internal
compensations.
The table below shows the difference in terms of ISL9440,
ISL9440A and ISL9441 features.
PART
NUMBER
ISL9440
ISL9440A
ISL9441
EARLY
WARNING
YES
YES
NO
SWITCHING FREQUENCY
(kHz)
300
600
300
Features
• Three Integrated Synchronous Buck PWM Controllers
- Internal Bootstrap Diodes
- Internal Compensation
- Internal Soft-Start
• Independent Control for Each Regulator and
Programmable Output Voltages; Independent
Enable/Shutdown
• Fixed Switching Frequency: 300kHz (ISL9440, ISL9441);
600kHz (ISL9440A)
• Adaptive Shoot Through Protection on all Synchronous
Buck Controllers
• Independently Programmable Voltage Outputs
• Out-of-Phase Switching to Reduce Input Capacitance
(0°/180°/0°)
• No External Current Sense Resistor
- Uses Lower MOSFET’s rDS(ON)
• Current Mode Controller with Voltage Feed Forward
• Complete Protection
- Overcurrent, Overvoltage, Undervoltage Lockout,
Over-Temperature
• Cycle by Cycle Current Limiting
• Wide Input Voltage Range
- Input Rail Powers VIN Pin: 5.6V to 24V
- Input Rail Powers VCC_5V Pin (VIN tied to VCC_5V, for
5V input applications): 4.5V to 5.6V
• Early Warning (ISL9440, ISL9440A) on Input Voltage
Failure
• Integrated Reset Function (ISL9440, ISL9440A)
• Pb-free (RoHS compliant)
Applications
• Satellite and Cable Set-Top Boxes
• Cable Modems
• VoX Gateway Devices
• NAS/SAN Devices
Related Literature
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN (MLFP) Packages”
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL9440, ISL9440A, ISL9441
Typical Application - ISL9440A
www.datasheet4u.com
C16
1µF VIN
4
C2
4.7µF
VCC_5V
3
+ C1
56µF
+12V
C3
10µF
BOOT1
31
BOOT2
26
C6
10µF
C7
0.1µF
VOUT1
+2.5V, 6A C9 + C14 +
330µF 330µF
R1
10.2k
L1
1.8µH
Q1
IRF7907
UGATE1 30
PHASE1 32
R3 ISEN1 1
8.45k
LGATE1 29
27 UGATE2
25 PHASE2
24 ISEN2 R4
8.45k
28 LGATE2
13 FB2
C8
0.1µF
L2
1.2µH
Q2
IRF7907
+ C10 + C15
330µF 330µF
VOUT2
+1.5V, 6A
R5
4.02k
FB1 6
R2
4.75k
VOUT3
+5V
C11
0.01µF
VOUT4
+3.3V, 500mA
Q4
IRF7404
C12 +
68µF
R12
100
R10
15k
R11
4.75k
G4
9
LDOFB
10
R71
301k
R72
301k
R73
261k
OCSET1
OCSET2
OCSET3
7
12
15
ISL9440A
+12V
BOOT3
20
C61
1µF
21 UGATE3
19 PHASE3
18 ISEN3 R41
2.8k
C81
0.1µF
L3
8.2µH
22 LGATE3
16 FB3
V VCC_5V
Q3
IRF7907
8 RST
R91
10k
RST
V VCC_5V
+ C13
330µF
R51
24.3k
R61
4.53k
R6
4.53k
VOUT3
+5V, 2A
2 PGOOD
5 14 17 23 11
R9
10K PGOOD
EN1 EN2 EN3
PGND SGND
5 FN6383.1
December 5, 2007
5 Page 
ISL9440, ISL9440A, ISL9441
Typical Performance Curves (Continued)
(Oscilloscope Plots are Taken Using the ISL9440EVAL1Z Evaluation Board, VIN = 12V Unless Otherwise Noted.)
5.10
5.10
5.09
5.09
www.datashe5e.t048u.com
5.08
5.07
5.07
5.06
5.06
5.05
0.0
1.0 2.0 3.0
LOAD CURRENT (A)
FIGURE 6. PWM3 LOAD REGULATION
4.0
100
95
90
85
80
75
70
65
60
0. 0 1.0 2.0 3.0 4. 0
LOAD CURRENT (A)
FIGURE 7. PWM3 EFFICIENCY vs LOAD (VO = 5V), VIN = 12V,
1 DUAL SO-8 MOSFET (IRF7907) FOR UPPER
AND LOWER MOSFETS
VOUT3 1V/DIV
VOUT4 (LDO) 1V/DIV
VOUT1 1V/DIV
VOUT2 1V/DIV
0.2ms/DIV
FIGURE 8. PWM SOFT-START WAVEFORMS
VIN, 1V/DIV, CH1
CH1
RST, 5V/DIV, CH3
CH3
PGOOD, 5V/DIV, CH4
CH4
100µs/DIV
FIGURE 10. VIN FALLING TO PGOOD FALLING DELAY TIME
VOUT1 50mV/DIV, AC COUPLED
VOUT2 50mV/DIV, AC COUPLED
VOUT3 50mV/DIV, AC COUPLED
VOUT4 50mV/DIV, AC COUPLED
5µs/DIV
FIGURE 9. OUTPUT RIPPLE UNDER MAXIMUM LOAD
(IO1 = IO1 = 6A, IO3 = 2A, IO4 = 0.5A)
CH3
VIN, 1V/DIV, CH1
RST, 5V/DIV, CH3
CH4
PGOOD, 5V/DIV, CH4
CH1
10µs/DIV
FIGURE 11. PGOOD FALLING TO RST FALLING
11 FN6383.1
December 5, 2007
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ISL9441.PDF ] | |
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