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| 型号： | ISL85402IRZ-TK |
| 厂商： | Intersil |
| 文件页数： | 1/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 20QFN |
| 标准包装： | 1,000 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 3 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.2MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 两者兼有 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-QFN（4x4） |
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 range of 3V to 36V in buck mode. It
supports 2.5A continuous load under conditions of 5V V OUT , V IN
range of 8V to 36V, 500kHz and +105°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
for more details.
The ISL85402 has a 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 V OUT ). 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 2.5V or lower (Refer to “Typical
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
? Buck Mode: Input Voltage Range 3V to 36V (Refer to “Input
? Boost Mode Expands Operating Input Voltage Lower Than
2.5V (Refer to “Input Voltage” on page 13 for more details)
? Selectable Forced PWM Mode or PFM Mode
? 300μA IC Quiescent Current (PFM, No Load); 180μA Input
Quiescent Current (PFM, No Load, V OUT Connected to
AUXVCC)
? Less than 3μA Shut Down 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
100
95
6V V IN
PGOOD
EN
VIN
VIN
90
85
12V V IN
MODE
SYNC
AUXVCC
VCC
ISL85402
BOOT
PHASE
VOUT
80
75
70
24V V IN
36V V IN
ILIMIT
SS
EXT_BOOST
LGATE
PGND
FB
65
60
55
FS
SGND
COMP
50
0.1m
1m
10m
100m
1.0
2.5
LOAD CURRENT (A)
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,
V OUT 5V, T A = +25°C
April 25, 2013
FN7640.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2011, 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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