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ISL85402 の電気的特性と機能

ISL85402のメーカーはIntersil Corporationです、この部品の機能は「2.5A Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL85402
部品説明 2.5A Regulator
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL85402 Datasheet, ISL85402 PDF,ピン配置, 機能
2.5A Regulator with Integrated High-Side MOSFET for
Synchronous Buck or Boost Buck Converter
ISL85402
The ISL85402 is a synchronous buck controller with a 125m
high-side MOSFET and low-side driver integrated. The ISL85402
supports a wide input voltage range from 3V to 36V. Regarding the
output current capability from the thermal perspective, the
ISL85402 can typically support continuous load of 2.5A under
conditions of 5V VOUT, VIN range of 8V to 30V, 500kHz, +85°C
ambient temperature with still air. For any specific application, the
actual maximum output current depends upon the die temperature
not exceeding +125°C with the power dissipated in the IC, which is
related to input voltage, output voltage, duty cycle, switching
frequency, board layout and ambient temperature, etc. Refer to
“Output Current” on page 13 for more details.
The ISL85402 has flexible selection of operation modes of
forced PWM mode and PFM mode. In PFM mode, the
quiescent input current is as low as 180µA (AUXVCC connected
to VOUT). The load boundary between PFM and PWM can be
programmed to cover wide applications.
The low-side driver can be either used to drive an external low-side
MOSFET for a synchronous buck, or left unused for a standard
non-synchronous buck. The low-side driver can also be used to
drive a boost converter as a pre-regulator followed by a buck
controlled by the same IC, which greatly expands the operating
input voltage range down to 3V or lower (Refer to “Typical
Application Schematic III - Boost Buck Converter” on page 5).
The ISL85402 offers the most robust current protections. It
uses peak current mode control with cycle-by-cycle current
limiting. It is implemented with frequency foldback under
current limit condition; besides that, the hiccup overcurrent
mode is also implemented to guarantee reliable operations
under harsh short conditions.
The ISL85402 has comprehensive protections against various faults
including overvoltage and over-temperature protections, etc.
Features
• Ultra Wide Input Voltage Range 3V to 36V
• Optional Mode Operation
- Forced PWM Mode
- Selectable PFM with Programmable PFM/PWM Boundary
• 300µA IC Quiescent Current (PFM, No Load); 180µA Input
Quiescent Current (PFM, No Load, VOUT Connected to
AUXVCC)
• Less than 3µA Standby Input Current (IC Disabled)
• Operational Topologies
- Synchronous Buck
- Non-Synchronous Buck
- Two-Stage Boost Buck
• Programmable Frequency from 200kHz to 2.2MHz and
Frequency Synchronization Capability
±1% Tight Voltage Regulation Accuracy
• Reliable Overcurrent Protection
- Temperature Compensated Current Sense
- Cycle-by-Cycle Current Limiting with Frequency Foldback
- Hiccup Mode for Worst Case Short Condition
• 20 Ld 4x4 QFN Package
• Pb-Free (RoHS Compliant)
Applications
• General Purpose
• 24V Bus Power
• Battery Power
Point of Load
• Embedded Processor and I/O Supplies
PGOOD
EN
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL85402 PHASE
LGATE
PGND
EXT_BOOST
FS
SGND
FB
COMP
VIN
FIGURE 1. TYPICAL APPLICATION
September 29, 2011
FN7640.0
1
VOUT
100
95 6V VIN
90
85 12V VIN
80
75 36V VIN
70 24V VIN
65
60
55
50
0.1m
1m
10m
100m
LOAD CURRENT (A)
1.0 2.5
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,
VOUT 5V, TA = +25°C
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned FarreeteheDparotapserhtey eoft thhtetipr :r/e/swpwecwtiv.deaotwansehrse.et4u.com/

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ISL85402 pdf, ピン配列
ISL85402
Functional Pin Descriptions (Continued)
PIN NAME
SYNC
LGATE
PGND
BOOT
VIN
SGND
VCC
AUXVCC
PAD
PIN #
DESCRIPTION
This pin can be used to synchronize two or more ISL85402 controllers. Multiple ISL85402 can be synchronized with their SYNC pins
connected together. 180 degree phase shift is automatically generated between the master and slave ICs.
12 The internal oscillator can also lock to an external frequency source applied on this pin with square pulse waveform (with frequency
10% higher than the IC’s local frequency, and pulse width higher than 150ns). Range: 0V to 5.5V.
This pin should be left floating if not used.
In synchronous buck mode, this Pin is used to drive the lower side MOSFET to improve efficiency.
13
In non-synchronous buck when a diode is used as the bottom side power device, this pin should be connected to VCC before VCC
startup to have low-side driver (LGATE) disabled.
In boost mode, it can be used to drive the boost power MOSFET. The boost control PWM is same with the buck control PWM.
14 This pin is used as the ground connection of the power flow including driver. Connect it to large ground plane.
This pin provides bias voltage to the high-side MOSFET driver. A bootstrap circuit is used to create a voltage suitable to drive the
15 internal N-channel MOSFET. The boot charge circuitries are integrated inside of the IC. No external boot diode is needed. A 1µF
ceramic capacitor is recommended to be used between BOOT and PHASE pin.
16, 17
Connect the input rail to these pins that are connected to the drain of the integrated high-side MOSFET as well as the source for the
internal linear regulator that provides the bias of the IC. Range: 3V to 36V.
With the part switching, the operating input voltage applied to the VIN pins must be under 36V. This recommendation allows for
short voltage ringing spikes (within a couple of ns time range) due to switching while not exceeding Absolute Maximum Ratings.
18 This pin provides the return path for the control and monitor portions of the IC. Connect it to quite ground plane.
19
This pin is the output of the internal linear regulator that supplies the bias for the IC including the driver. A minimum 4.7µF
decoupling ceramic capacitor is recommended between VCC to ground.
7 This pin is the input of the auxiliary internal linear regulator which can be supplied by the regulator output after power-up. With such
configuration, the power dissipation inside of the IC is reduced. The input range for this LDO is 3V to 20V.
In boost mode operation, this pin works as boost output overvoltage detection pin. It detects the boost output through a resistor
divider. When voltage on this pin is above 0.8V, the boost PWM disabled; and when voltage on this pin is below 0.8V minus the
hysteresis, the boost PWM is enabled.
Range: 0V to 20V.
21
Bottom thermal pad. It is not connected to any electrical potential of the IC. In layout it must be connected to PCB ground copper
plane with area as large as possible to effectively reduce the thermal impedance.
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP.
RANGE (°C)
PACKAGE
(PB-Free)
PKG. DWG. #
ISL85402IRZ
85 402IRZ
-40 to +85
20 Ld 4x4 QFN
L20.4x4C
ISL85402EVAL1Z
Evaluation Board
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL85402. For more information on MSL please see techbrief TB363.
3 FN7640.0
September 29, 2011


3Pages


ISL85402 電子部品, 半導体
ISL85402
Absolute Maximum Ratings
VIN, PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +44V
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +6.0V
AUXVCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +22V
Absolute Boot Voltage, VBOOT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +50.0V
Upper Driver Supply Voltage, VBOOT - VPHASE. . . . . . . . . . . . . . . . . . . +6.0V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to VCC + 0.3V
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000V
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000V
Latchup Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance
θJA (°C/W) θJC (°C/W)
ISL85402 QFN 4x4 Package (Notes 4, 5). . . . . .
40
3.5
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range. . . . . . . . . . . . . . . . . -65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Supply Voltage on VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 36V
AUXVCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +20V
Ambient Temperature Range (Industrial). . . . . . . . . . . . . . . . . . -40°C to +85°C
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
5. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications Refer to “Block Diagram” on page 4 and “Typical Application Schematics” on page 5. Operating
Conditions Unless Otherwise Noted: VIN = 12V, or VCC = 4.5V ±10%, TA = -40°C to +85°C. Typical are at TA = +25°C. Boldface limits apply over
the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 6) TYP (Note 6) UNITS
VIN PIN SUPPLY
VIN Pin Voltage Range
VIN Pin
3.05
36 V
VIN Pin connected to VCC
3.05
5.5 V
Operating Supply Current
IQ MODE = VCC/FLOATING (PFM), no load at the 300 µA
output
MODE = GND (Forced PWM), VIN = 12V,
Non-switching
1.2 mA
Standby Supply Current
INTERNAL MAIN LINEAR REGULATOR
IQ_SBY
EN connected to GND, VIN = 12V
1.8 3 µA
MAIN LDO VCC Voltage
MAIN LDO Dropout Voltage
VCC Current Limit of MAIN LDO
INTERNAL AUXILIARY LINEAR REGULATOR
VCC
VDROPOUT_MAIN
VIN > 5V
VIN = 4.2V, IVCC = 35mA
VIN = 3V, IVCC = 25mA
4.2 4.5 4.8
0.3 0.5
0.25 0.3
60
V
V
V
mA
AUXVCC Input Voltage Range
AUX LDO VCC Voltage
LDO Dropout Voltage
Current Limit of AUX LDO
VAUXVCC
VCC
VDROPOUT_AUX
VAUXVCC > 5V
VAUXVCC = 4.2V, IVCC = 35mA
VAUXVCC = 3V, IVCC = 25mA
3 20
4.2 4.5 4.8
0.3 0.5
0.25 0.3
60
V
V
V
V
mA
AUX LDO Switch-over Rising Threshold
AUX LDO Switch-over Falling Threshold Voltage
VAUXVCC_RISE
VAUXVCC_FALL
AUXVCC voltage rise; Switch to Auxiliary LDO
AUXVCC voltage fall; Switch back to main BIAS
LDO
3
2.73
3.1
2.87
3.2
2.97
V
V
AUX LDO Switch-over Hysteresis
VAUXVCC_HYS AUXVCC Switch-over Hysteresis
0.2 V
6 FN7640.0
September 29, 2011

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共有リンク

Link :


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