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Intersil Electronic Components Datasheet

ISL6440 Datasheet

Step-Down PWM Controller

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ISL6440 pdf
®
Data Sheet
October 4, 2005
ISL6440
FN9040.2
300kHz Dual, 180° Out-of-Phase, Step-
Down PWM Controller
The ISL6440 is a high-performance, dual-output PWM
controller optimized for converting wall adapter, battery or
network intermediate bus DC input supplies into the system
supply voltages required for a wide variety of applications.
Each output is adjustable down to 0.8V. The two PWMs are
synchronized 180o out of phase reducing the RMS input
current and ripple voltage.
The ISL6440 incorporates several protection features. An
adjustable overcurrent protection circuit monitors the output
current by sensing the voltage drop across the lower
MOSFET. Hiccup mode overcurrent operation protects the
DC/DC components from damage during output
overload/short circuit conditions. Each PWM has an
independent logic-level shutdown input (SD1 and SD2).
A single PGOOD signal is issued when soft-start is complete
on both PWM controllers and their outputs are within 10% of
the set point. Thermal shutdown circuitry turns off the device
if the junction temperature exceeds +150°C.
Pinout
ISL6440 (QSOP)
TOP VIEW
1 LGATE2 LGATE1 24
2 BOOT2 BOOT1 23
3 UGATE2 UGATE1 22
4 PHASE2 PHASE1 21
5 ISEN2
ISEN1 20
6 PGOOD PGND 19
7 VCC5
SD1 18
8 SD2
SS1 17
9 SS2
SGND 16
10 OCSET2 OCSET1 15
11 FB2
FB1 14
12 VIN
BIAS 13
Features
• Wide Input Supply Voltage Range
- 5.6V to 24V
- 4.5V to 5.6V
• Two Independently Programmable Output Voltages
• Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . 300kHz
• Out of Phase PWM Controller Operation
- Reduces Required Input Capacitance and Power
Supply Induced Loads
• No External Current Sense Resistor
- Uses Lower MOSFET’s rDS(ON)
• Programmable Soft-Start
• Extensive Circuit Protection Functions
- PGOOD
- UVLO
- Overcurrent
- Overtemperature
- Independent Shutdown for Both PWMs
• Excellent Dynamic Response
- Voltage Feed-Forward with Current Mode Control
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Power Supplies with Two Outputs
• xDSL Modems/Routers
• DSP, ASIC, and FPGA Power Supplies
• Set-Top Boxes
• Dual Output Supplies for DSP, Memory, Logic, µP Core
and I/O
• Telecom Systems
Ordering Information
PART
NUMBER
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE
PKG.
DWG. #
ISL6440IA ISL6440IA -40 to 85 24 Ld QSOP M24.15
ISL6440IAZ ISL6440IAZ -40 to 85 24 Ld QSOP M24.15
(See Note)
(Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with both SnPb
and Pb-free soldering operations. Intersil Pb-free products are MSL classified
at Pb-free peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
Add “-T” or “-TK” suffix for tape and reel.
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. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.


Intersil Electronic Components Datasheet

ISL6440 Datasheet

Step-Down PWM Controller

No Preview Available !

ISL6440 pdf
ISL6440
Typical Application Schematic
D1
BAT54HT1
C3
10µF
C4
0.1µF
VIN
SS1
17
12
BOOT1
23
C2
4.7µF
VCC5
7 9 SS2
2 BOOT2
C5
0.1µF
VCC5
+ C1
56µF
D2
BAT54HT1
C6
10µF
+12V
VOUT1
+1.8V, 2A
C9 +
330µF
R3
12.4K
R4
10K
C7
0.1µF
L1
6.4µH
Q1
FDS6990S
UGATE1 22
PHASE1 21
3 UGATE2
4 PHASE2
R1
1.4K
ISEN1 20
LGATE1 24
ISL6440IA
5 ISEN2
R2
1.4K
1 LGATE2
PGND 19
11 FB2
FB1 14
SD1 18
SD2 8
16 13
SGND
BIAS
OCSET1
15
R7
121K
OCSET2
10
R8
121K
6
PGOOD
C8
0.1µF
L2
6.4µH
Q2
FDS6990S
R9
10K
VCC5
+ C10
330µF
VOUT2
+3.3V, 2A
R5
31.6K
R6
10K
PGOOD
2 FN9040.2
October 4, 2005


Part Number ISL6440
Description Step-Down PWM Controller
Maker Intersil Corporation
Total Page 15 Pages
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