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PDF ISL9440B Data sheet ( Hoja de datos )
| Número de pieza | ISL9440B | |
| Descripción | Triple Step-Down PWM and Single Linear Controller | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
ISL9440B, ISL9440C
January 15, 2009
FN6799.0
Triple Step-Down PWM and Single Linear
Controller with Programmable Soft-Start
www.TdahteasISheLe9t44u4.0cBomand ISL9440C are quad-output synchronous
buck controllers that integrate three PWM controllers and one
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 ISL9440B and ISL9440C offer programmable 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. An early
warning function is offered to output a logic signal to warn
the system to back up data when input voltage falls below a
certain level.
The ISL9440B and ISL9440C 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 ISL944XX
family features.
PART
NUMBER
ISL9440
ISL9440A
ISL9441
ISL9440B
ISL9440C
SWITCHING
EARLY FREQUENCY
WARNING
(kHz)
SOFT-STARTING
TIME (ms)
YES
300
1.7
YES
600
1.7
NO 300
1.7
YES
300 PROGRAMMABLE
YES
600 PROGRAMMABLE
Features
• Three Integrated Synchronous Buck PWM Controllers
- Internal Bootstrap Diodes
- Internal Compensation
• Independent Control for each Regulator and
Programmable Output Voltages; Independent
Enable/Shutdown/Soft-start
• Fixed Switching Frequency: 300kHz(B), 600kHz(C)
• 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 on Input Voltage Failure
• Integrated Reset Function
• Pb-Free (RoHS Compliant)
Applications
• Satellite and Cable Set-Top Boxes
• Cable Modems
• VoX Gateway Devices
• NAS/SAN Devices
• ATX Power Supply
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. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL9440B, ISL9440C
Typical Application - ISL9440C
+12V
www.datasheet4u.com
CIN2
10µF
CINF
1µF
VIN
4
BOOT1
31
C1
4.7µF
VCC_5V
3
BOOT2
26
+ CIN1
100µF
CIN3
10µF
C2
0.1µF
VOUT1
+1.0V, 6A
L1
+ CO1 1.0µH
330µF
6TPF330M9L
R1
25.5k
CFF1
2200pF
R2
102k
CP1
4700pF VOUT2
+3.3V
VOUT4
Q4
FDS8433A
+2.5V, 800mA
C6 +
100µF
UGATE1 30
PHASE1 32
R3 ISEN1 1
1.82k
LGATE1 29
Q1
IRF7907
FB1 6
C4
0.1µF
R7
51 G4
9
R8
21.5k
R9
10k
LDOFB
10
R15
100k
R16
100k
R17
200k
OCSET1
OCSET2
OCSET3
7
12
15
CSS1
22nF
CSS2
22nF
CSS3
22nF
EN/SS1
5
EN/SS2
14
EN/SS3
17
27 UGATE2
25 PHASE2
24 ISEN2 R4
3.09k
28 LGATE2
13 FB2
ISL9440C
BOOT3
20
C3
0.1µF
L2
1.8µH +
Q2
IRF7907
CO2
330µF
6TPF220MI
CFF2
47pF
+12V
CIN4
10µF
VOUT2
+3.3V, 6A
R5
34k
R6
10.7k
21 UGATE3
19 PHASE3
C5
0.1µF
18 ISEN3 R10
3.09k
22 LGATE3
L3
2.8µH
Q3
IRF7907
16 FB3
8 RST
V VCC_5V
R13
100k
RST
+ CO3
220µF
6TPF220MI
VOUT3
+5V, 4A
R11 CFF3
105k 220pF
R12
20k
V VCC_5V
2 PGOOD
R14
100k PGOOD
23 11
PGND SGND
5 FN6799.0
January 15, 2009
5 Page 
ISL9440B, ISL9440C
Typical Performance Curves (Continued)
(Oscilloscope Plots are Taken Using the ISL9440BEVAL1Z Evaluation Board, VIN = 19V Unless Otherwise Noted).
3.36
3.35
www.datash3e.3e4t4u.com
VIN = 19V
VIN = 12V
3.33
3.32
3.31
VIN = 5V
3.30
0
4 8 12
LOAD CURRENT (A)
FIGURE 4. PWM2 LOAD REGULATION
16
100
95
90
85
80 VIN = 19VDC VIN = 23VDC
VIN = 16VDC
75
70
65
60
0 2 4 6 8 10 12 14
LOAD CURRENT (A)
FIGURE 5. PWM2 EFFICIENCY vs LOAD (VO = 3.3V),
RJK0305DPB FOR UPPER MOSFET AND
RJK0301DPB FOR LOWER MOSFET
12.10
12.08
12.06
VIN = 23V
VIN = 19V
12.04
12.02
12.00
11.98
11.96
VIN = 15V
11.94
11.92
11.90
0
4 8 12
LOAD CURRENT (A)
FIGURE 6. PWM3 LOAD REGULATION
16
100
95
90
VIN = 19VDC
85
VIN = 16VDC
80
75
VIN = 23VDC
70
65
60
0 2 4 6 8 10 12
LOAD CURRENT (A)
FIGURE 7. PWM3 EFFICIENCY vs LOAD (VO = 12V),
RJK0304DPB FOR UPPER MOSFET AND
RJK0301DPB FOR LOWER MOSFET
5.25
VIN = 24V
5.0
5.00
4.75
VIN = 5.0V
4.50
VIN = 5.5V
4.5
4.0
4.25
VIN = 4.5V
3.5
16
14
4.00
0
10 20 30
LOAD CURRENT (A)
FIGURE 8. VCC_5V vs SUPPLY
40
50
3.0
4
7 10 13 16 19 22
INPUT VOLTAGE (V)
FIGURE 9. OPERATING CURRENT vs VIN
(RPG = RRST = 100kΩ, ROCSET = 121kΩ)
25
11 FN6799.0
January 15, 2009
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ISL9440B.PDF ] | |
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| ISL9440B | Triple Step-Down PWM and Single Linear Controller | Intersil Corporation |
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