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ISL6426IV の電気的特性と機能

ISL6426IVのメーカーはIntersil Corporationです、この部品の機能は「Single Synchronous Buck Pulse-Width Modulation (PWM) Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL6426IV
部品説明 Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL6426IV Datasheet, ISL6426IV PDF,ピン配置, 機能
®
Data Sheet
ISL6406, ISL6426
October 2003
FN9073.4
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6406, ISL6426 is an adjustable frequency,
synchronous buck switching regulator optimized for
generating lower voltages for the distributed DC-DC
architectures. The ISL6406 offers an adjustable output
voltage, while the ISL6426 provides a fixed 1.8V output.
Designed to drive N-Channel MOSFETs in synchronous
buck topology, the ISL6406, ISL6426 integrates the control,
output adjustment and protection functions into a single
package.
The ISL6406, ISL6426 provides simple, single feedback
loop, voltage-mode control with fast transient response. The
output voltage can be precisely regulated to as low as 0.8V.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate which enables high converter
bandwidth for fast transient performance.
Protection from overcurrent conditions is provided by
monitoring the rDS(ON) of the upper MOSFET to inhibit PWM
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
The wide programmable switching frequency range of
100kHz to 700kHz allows the use of small surface mount
inductors and capacitors. The device also provides external
frequency synchronization making it an ideal choice for
DC-DC converter applications.
Ordering Information
TEMP. RANGE
PART NUMBER (oC) PACKAGE PKG. NO.
ISL6406CB
0 to 70
16 Ld SOIC M16.15
ISL6406IB
-40 to 85 16 Ld SOIC M16.15
ISL6406CR
0 to 70
16 Ld QFN
L16.5x5B
ISL6406IR
-40 to 85 16 Ld QFN L16.5x5B
ISL6406CV
0 to 70
16 Ld TSSOP M16.173
ISL6406IV
-40 to 85 16 Ld TSSOP M16.173
ISL6406CVZ (Note)
0 to 70
16 Ld TSSOP M16.173
ISL6406IVZ (Note)
-40 to 85 16 Ld TSSOP M16.173
ISL6426CB
0 to 70
16 Ld SOIC M16.15
ISL6426IB
-40 to 85 16 Ld SOIC M16.15
ISL6426CR
0 to 70
16 Ld QFN
L16.5x5B
ISL6426IR
-40 to 85 16 Ld QFN L16.5x5B
ISL6426CV
0 to 70
16 Ld TSSOP M16.173
ISL6426IV
-40 to 85 16 Ld TSSOP M16.173
Features
• Operates from 3.3V/5V Input
• 0.8V to VIN Output Range
- 0.8V Internal Reference
- ±1.5% Reference Accuracy
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
• Lossless, Programmable Overcurrent Protection
- Uses Upper MOSFET’s rDS(on)
• Programmable Switching Frequency 100kHz–700kHz
• External Frequency Synchronization
• Two Device Options Available
- ISL6406 . . . . . . . . . . . . . . . . Adjustable Output Voltage
- ISL6426 . . . . . . . . . . . . . . . . . . . . . . Fixed 1.8V Output
• Internal Soft-Start
• QFN Package Option
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline
- QFN Near Chip Scale Package Footprint; Improves
PCB Efficiency, Thinner in Profile
• Lead Free TSSOP Packaging Available
- Designated with “Z” Suffix (Refer to Note Below)
Applications
• 3V/5V DC-DC Converter Modules
• Distributed DC-DC 3.3V, 2.5V and 1.8V Power
Architectures for DSP, Logic, and Memory
• Power Supplies for Microprocessors
- PCs
- Embedded Controllers
• Memory Supplies
• Personal Computer Peripherals
NOTE: “Z” Suffix: These products are packaged in 16 ld TSSOP
packages that are MSL level 1 at 255-260oC peak reflow
temperature, which exceeds the IPC J Std-020B requirements for
MSL level 1. The lead free and green products employ special lead
free material sets including 100% matte tin plate termination finish,
which is compatible with either Sn/Pb or lead free soldering
operations.
Tape and Reel available. Add “-T” suffix for Tape and Reel Packing
Option.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

1 Page





ISL6426IV pdf, ピン配列
ISL6406, ISL6426
Typical Application Schematic for 5V Input
VIN
5V ±10%
CIN
NC
RT
VCC
VCC
CT1 OCSET
ROCSET
CBULK
CT2 CPVOUT
ISL6406, ISL6426
RT
CPGND
BOOT
GND
VOUT
SYNC/EN
COMP
UGATE
PHASE
LGATE
FB
DBOOT
CBOOT
CDCPL
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
Typical Application Schematic for 3.3V Input
VIN
3.3V ±10%
CIN
CPUMP
RT
VCC
VCC
CT1 OCSET
ROCSET
CBULK
CPVOUT
CT2 ISL6406, ISL6426
RT
BOOT
CPGND
GND
VOUT
SYNC/ EN
COMP
UGATE
PHASE
LGATE
FB
DBOOT
CBOOT
CDCPL
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
3


3Pages


ISL6426IV 電子部品, 半導体
ISL6406, ISL6426
Pin Descriptions
CPVOUT - This pin represents the output of the charge
pump. The voltage at this pin is the bias voltage for the IC.
Connect a decoupling capacitor from this pin to ground. The
value of the decoupling capacitor should be at least 10x the
value of the charge pump capacitor. This pin may be tied to
the bootstrap circuit as the source for creating the BOOT
voltage.
CT1 and CT2 - These pins are the connections for the
external charge pump capacitor. A minimum of a 0.1µF
ceramic capacitor is recommended for proper operation of
the IC.
OCSET - Connect a resistor (ROCSET) from this pin to the
drain of the upper MOSFET (VIN). ROCSET, an internal 20µA
current source (IOCSET), and the upper MOSFET on-
resistance (rDS(ON)) set the converter overcurrent (OC) trip
point according to the following equation:
IPEAK = (---I--O----C----S----rE--D--T--S--)--((--O-R----NO----)-C----S----E----T---)-
An overcurrent trip cycles the soft-start function.
VOUT - This pin provides the external switcher output
voltage to the IC as feedback for the 1.8V fixed output
voltage option. Tie this pin to 1.8V for the ISL6426 fixed 1.8V
option. Leave this pin open on the ISL6406 for the adjustable
output voltage option.
VCC - This pin provides bias supply for the ISL6406,
ISL6426. Connect a well-coupled 3.3V supply to this pin.
PHASE - Connect this pin to the upper MOSFET’s source.
This pin is used to monitor the voltage drop across the upper
MOSFET for overcurrent protection.
RT - Connect an external resistor from this pin to ground for
frequency selection. Refer to RT vs Frequency curve of
Figure 3.
BOOT - This pin provides ground referenced bias voltage to
the upper MOSFET driver. A bootstrap circuit is used to
create a voltage suitable to drive a logic-level N-Channel
MOSFET.
UGATE - Connect this pin to the upper MOSFET’s gate. This
pin provides the PWM-controlled gate drive for the upper
MOSFET. This pin is also monitored by the adaptive shoot-
through protection circuitry to determine when the upper
MOSFET has turned off.
GND - This pin represents the signal and power ground for
the IC. Tie this pin to the ground island/plane through the
lowest impedance connection available.
LGATE - Connect this pin to the lower MOSFET’s gate. This
pin provides the PWM-controlled gate drive for the lower
MOSFET. This pin is also monitored by the adaptive shoot-
through protection circuitry to determine when the lower
MOSFET has turned off.
COMP and FB - COMP and FB are the available external
pins of the error amplifier. The FB pin is the inverting input of
the internal error amplifier and the COMP pin is the error
amplifier output. These pins are used to compensate the
control feedback loop of the converter.
CPGND - This pin represents the signal and power ground
for the charge pump. Tie this pin to the ground island/plane
through the lowest impedance connection available.
SYNC/EN - This is a dual-function pin. To synchronize with
an external clock, apply a clock with a frequency 1.1 times
higher than the part’s natural frequency to this pin. The
device may be disabled by tying this pin to ground. In this
shutdown mode, all functions are disabled and the device
will draw <50µA supply current.
6

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
ISL6426IB

Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

Intersil Corporation
Intersil Corporation
ISL6426IR

Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

Intersil Corporation
Intersil Corporation
ISL6426IV

Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

Intersil Corporation
Intersil Corporation


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