参数资料
| 型号： | ISL9105IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8DFN |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.6MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-DFN（2x3） |
| 产品目录页面： | 1244 (CN2011-ZH PDF) |
| 其它名称： | ISL9105IRZ-TDKR |
ISL9105
Block Diagram
MODE
SHUTDOWN
Soft
SOFT
START
SHUTDOWN
EN
BANDGAP 0.8V
EAMP
+
OSCILLATOR
VIN
COMP
PWM/PFM
LOGIC
FB
+
Slope
SLOPE
COMP
CONTROLLER
PROTECTION
DRIVER
+
PHASE
GND
CSA1
REF4
+
+
OCP
REF1
+
REF3
+
SKIP
REF2
POR
POR
DELAY
ZERO CROSS
SENSING
RSI
Theory of Operation
REF5
SCP
+
resistance of the P-Channel MOSFET when it is turned on
The ISL9105 is a step-down switching regulator optimized
for battery-powered handheld applications. The regulator
operates at 1.6MHz fixed switching frequency under heavy
load conditions to allow small external inductor and
capacitors to be used for minimal printed-circuit board (PCB)
area. At light load, the regulator reduces the switching
frequency, unless forced to the fixed frequency, to minimize
the switching loss and to maximize the battery life. The
quiescent current when the output is not loaded is typically
only 25μA. The supply current is typically only 0.1μA when
the regulator is shut down.
PWM Control Scheme
The ISL9105 employs the current-mode pulse-width
modulation (PWM) control scheme for fast transient
response and pulse-by-pulse current limiting. Figure 15
shows the block diagram. The current loop consists of the
oscillator, the PWM comparator COMP, current sensing
circuit, and the slope compensation for the current loop
stability. The current sensing circuit consists of the
7
and the Current Sense Amplifier (CSA). The control
reference for the current loops comes from the Error
Amplifier (EAMP) of the voltage loop.
The PWM operation is initialized by the clock from the
oscillator. The P-Channel MOSFET is turned on at the
beginning of a PWM cycle and the current in the P-Channel
MOSFET starts ramping up. When the sum of the CSA output
and the compensation slope reaches the control reference of
the current loop, the PWM comparator COMP sends a signal
to the PWM logic to turn off the P-Channel MOSFET and to
turn on the N-Channel MOSFET. The N-Channel MOSFET
remains on till the end of the PWM cycle. Figure 15 shows the
typical operating waveforms during the PWM operation. The
dotted lines illustrate the sum of the compensation ramp and
the CSA output.
The output voltage is regulated by controlling the reference
voltage to the current loop. The bandgap circuit outputs a
0.8V reference voltage to the voltage control loop. The
feedback signal comes from the FB pin. The soft-start block
only affects the operation during the start-up and will be
FN6415.2
March 28, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL9105IRZ-TS2715 | 制造商:Intersil Corporation 功能描述:S SPEC FOR TRACKING BROADCOM BUSINESS ONLY-SOLD THRU DISTI - Tape and Reel |
| ISL9106 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:1.2A 1.6MHz Low Quiescent Current High Efficiency Synchronous Buck Regulator |
| ISL9106EVAL1Z | 功能描述:电源管理IC开发工具 ISL9106 EVALUATION BOARD 1 - RoHS COMPLIANT - DFN RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| ISL9106IRZ | 功能描述:IC REG BUCK SYNC ADJ 1.2A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:50 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:5 V ~ 25 V 输入电压:2.3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:600kHz，1.2MHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 包装:管件 供应商设备封装:8-MSOP |
| ISL9106IRZ-T | 功能描述:IC REG BUCK SYNC ADJ 1.2A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:1,000 系列:- 类型:降压（降压） 输出类型:可调式 输出数:1 输出电压:0.6 V ~ 4.5 V 输入电压:3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:3MHz 电流 - 输出:1.5A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 供应商设备封装:6-LLP-EP（3x3） 产品目录页面:1300 (CN2011-ZH PDF) 其它名称:LM2831ZSDLM2831ZSDTR |
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