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ISL6443 の電気的特性と機能

ISL6443のメーカーはIntersil Corporationです、この部品の機能は「Step- Down PWM and Single Linear Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL6443
部品説明 Step- Down PWM and Single Linear Controller
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL6443 Datasheet, ISL6443 PDF,ピン配置, 機能
®
Data Sheet
August 9, 2006
ISL6443
FN9044.2
300kHz Dual, 180° Out-of-Phase, Step-
Down PWM and Single Linear Controller
The ISL6443 is a high-performance, triple-output 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 180° out of phase reducing the RMS input
current and ripple voltage.
The ISL6443 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 and the linear regulator output is greater than
75% of its setpoint. Thermal shutdown circuitry turns off the
device if the junction temperature exceeds +150°C.
Ordering Information
PART
PART
TEMP.
PKG.
NUMBER MARKING RANGE (°C) PACKAGE DWG. #
ISL6443IR ISL6443IR -40 to 85 28 Ld 5x5 QFN L28.5x5
ISL6443IRZ ISL6443IRZ -40 to 85 28 Ld 5x5 QFN L28.5x5
(See Note)
(Pb-free)
Add “-T” or “-TK” suffix for tape and reel.
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.
Features
• Wide Input Supply Voltage Range
- Variable 5.6V to 24V
- Fixed 4.5V to 5.6V
• Three 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)
• Bidirectional Frequency Synchronization for
Synchronizing Multiple ISL6443s
• Programmable Soft-Start
• Extensive circuit protection functions
- PGOOD
- UVLO
- Overcurrent
- Over-temperature
- Independent Shutdown for Both PWMs
• Excellent Dynamic Response
- Voltage Feed-Forward with Current Mode Control
• QFN Packages:
- QFN - Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Power Supplies with Multiple 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
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. 2005-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

1 Page





ISL6443 pdf, ピン配列
Block Diagram
BOOT1
UGATE1
PHASE1
VCC_5V
LGATE1
PGND
ADAPTIVE DEAD-TIME
DIODE EMULATION
V/I SAMPLE TIMING
PGOOD SD1
GATE3
FB3
gm*VE
0.8V REFERENCE
+
VE +
-
UV
PGOOD
VIN SGND
SD2
VCC
POR
ENABLE
BIAS SUPPLIES
REFERENCE
FAULT LATCH
SOFT-START
UV
PGOOD
FB1
SS1
180k
+ 0.8V
REF
1400k
-
+
18.5pF
16k
ERROR AMP 1
ISEN1
CURRENT
SAMPLE
OCSET1
-
+ CURRENT
SAMPLE
+ 0.8V REFERENCE
- PWM1
+
OC1
OC2
PWM2
-
+
DUTY CYCLE RAMP GENERATOR
PWM CHANNEL PHASE CONTROL
- OC1
OC2 -
++
VIN SYNC VCC
SAME STATE FOR
2 CLOCK CYCLES
REQUIRED TO LATCH
OVERCURRENT FAULT
SAME STATE FOR
2 CLOCK CYCLES
REQUIRED TO LATCH
OVERCURRENT FAULT
ADAPTIVE DEAD-TIME
DIODE EMULATION
V/I SAMPLE TIMING
PGND
BOOT2
UGATE2
PHASE2
VCC
LGATE2
18.5pF
16k
ERROR AMP 2
1400k
-
+
180k
VSEN2
SOFT2
CURRENT
SAMPLE
-
+
+
0.8V REFERENCE
+
0.8V
REF
ISEN2
CURRENT
SAMPLE
OCSET2


3Pages


ISL6443 電子部品, 半導体
ISL6443
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application
Schematic. VIN = 5.6V to 24V, or VCC_5V = 5V ±10%, TA = -40°C to 85°C (Note 2),
Typical values are at TA = 25°C (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PWM CONVERTERS
Output Voltage
- 0.8 -
V
FB Pin Bias Current
- - 150 nA
Maximum Duty Cycle
Minimum Duty Cycle
COUT = 1000pF, TA = 25°C
93 -
-%
- 4 -%
PWM CONTROLLER ERROR AMPLIFIERS
DC Gain (Note 7)
80 88 - dB
Gain-Bandwidth Product (Note 7)
5.9 -
- MHz
Slew Rate (Note 7)
- 2.0 - V/µs
Maximum Output Voltage (Note 7)
0.9 - - V
Minimum Output Voltage (Note 7)
- - 3.6 V
PWM CONTROLLER GATE DRIVERS (Note 8)
Sink/Source Current
- 400 - mA
Upper Drive Pull-Up Resistance
VCC_5V = 4.5V
-8-
Upper Drive Pull-Down Resistance
VCC_5V = 4.5V
- 3.2 -
Lower Drive Pull-Up Resistance
VCC_5V = 4.5V
-8-
Lower Drive Pull-Down Resistance
VCC_5V = 4.5V
- 1.8 -
Rise Time
Fall Time
LINEAR CONTROLLER
COUT = 1000pF
COUT = 1000pF
- 18 - ns
- 18 - ns
Drive Sink Current
50 -
- mA
FB3 Feedback Threshold
I = 21mA
- 0.8 -
V
Undervoltage Threshold
FB3 Input Leakage Current (Note 7)
VFB
- 75 - %
- 45- 150 nA
Amplifier Transconductance
POWER GOOD AND CONTROL FUNCTIONS
VFB = 0.8V, I = 21mA
- 2 - A/V
PGOOD LOW Level Voltage
Pull-up = 100k
-
0.1 0.5
V
PGOOD Leakage Current
- - ±1.0 µA
PGOOD Upper Threshold, PWM 1 and 2
Fraction of set point
105 - 120 %
PGOOD Lower Threshold, PWM 1 and 2
Fraction of set point
80 - 95 %
PGOOD for Linear Controller
70 75 80 %
ISEN and CURRENT LIMIT
Full Scale Input Current (Note 9)
- 32 - µA
Overcurrent Threshold (Note 9)
ROCSET = 110k
- 64 - µA
OCSET (Current Limit) Voltage
- 1.75 -
V
SOFT-START
Soft-Start Current
- 5 - µA
6 FN9044.2
August 9, 2006

6 Page



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