参数资料
| 型号： | ISL6455IRZ-TK |
| 厂商： | Intersil |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG TRPL SYNC DUAL LDO 24QFN |
| 标准包装： | 1 |
| 应用： | 转换器，FPGAs |
| 输入电压： | 3 V ~ 3.6 V |
| 输出数： | 3 |
| 输出电压： | 0.8 V ~ 2.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN（4x4） |
| 包装： | 剪切带 (CT) |
| 其它名称： | ISL6455IRZ-TKCT |
ISL6455, ISL6455A
Pin Descriptions
PVCC - Positive supply for the power (internal FET) stage of
the PWM section.
SGND - Analog ground for the PWM. All internal control
circuits are referenced to this pin.
EN - The PWM controller is enabled when this pin is HIGH,
and disabled when the pin is pulled LOW. It is a CMOS logic-
level input (referenced to V IN ).
V IN _LDO - This is the input voltage pin for LDO1 and LDO2.
EN_LDO - LDO1 and LDO2 are enabled when this pin is
HIGH, and disabled when the pin is pulled LOW. It is a
CMOS logic-level input (referenced to V IN ).
CT - Timing capacitor pin to set the 25ms minimum pulse
width for the RESET signal.
RESET - This pin is the output of the reset supervisory
circuit, which monitors VIN_PWM. The IC asserts a RESET
signal whenever the supply voltage drops below a preset
threshold. It is kept asserted for a minimum of 25ms after
V CC (V IN ) has risen above the reset threshold. The output is
push-pull. The device will continue to operate until V IN drops
below the UVLO threshold.
When EN = LOW then RESET = HIGH and the moment EN
is made HIGH the RESET will pulse LOW for a period of
25ms minimum (VIN > Reset threshold). If VIN < reset
threshold then it will switch low and stay low for a period of
25ms after VIN_PWM crosses the reset threshold.
PG_LDO - This is a high impedance open drain output that
provides the status of both LDOs. When either of the outputs
are out of regulation, PG_LDO goes LOW.
CC1 - This is the compensation capacitor connection for
LDO1. Connect a 0.033μF capacitor from CC1 to
GND_LDO.
CC2 - This is the compensation capacitor connection for
LDO2. Connect a 0.033μF capacitor from CC2 to
GND_LDO.
V OUT2 - This pin is the output of LDO2. Bypass with a
minimum 2.2μF, low ESR capacitor to GND_LDO for stable
operation.
GND_LDO - Ground pin for LDO1 and LDO2.
V OUT1 - This pin is the output of LDO1. Bypass with a
minimum 2.2μF, low ESR capacitor to GND_LDO for stable
operation.
PGND - Power ground for the PWM controller stage.
V OUT - This I/O pin senses the output voltage of the PWM
converter for the purpose of detecting the over and
undervoltage conditions.
8
PG_PWM - This pin is an active pull-up/pull-down able to
source/sink 1mA (min.) at 0.4V from V IN /SGND. This output
is HIGH when V OUT is within ±8% (typical).
FB_LDO1 and FB_LDO2 - These pins are used to set the
LDO output with the proper selection of resistors. i.e. Ra and
Rb for LDO1 and Rc and Rd for LDO2. Resistors should be
chosen to provide a minimum current of 200μA load for each
LDO output.
LX - The LX pin is the switching node of synchronous buck
converter, connected internally at the junction point of the
upper MOSFET source and lower MOSFET drain. Connect
this pin to the output inductor.
V IN - This pin is the power supply for the PWM controller
stage and must be closely decoupled to ground.
SYNC - This is the external clock synchronization input. The
device can be synchronized to 500kHz to 1MHz switching
frequency. If unused then it should be tied to GND or VCC
GND - Tie this pin to the ground plane with a low impedance,
shortest possible path.
FB_PWM - This is used to set the value of the output voltage
of the PWM with external resistors Re and Rf.
Functional Description
The ISL6455 is a 3-in-1 multi-output regulator designed for
FPGA and wireless chipset power applications. The device
integrates a single synchronous buck regulator with dual
LDOs. The PWM output can be set by choosing appropriate
values for Re and Rf. At a setting of 1.8V the synchronous
buck regulator provides for an efficiency greater than 92%.
The LDO1 can be set with resistor pair Rc and Rd. The
LDO2 can be set with the resistor pair Ra and Rb.
Undervoltage lock-out (UVLO) prevents the converter from
turning on when the input voltage is less than 2.6V typical.
Additional blocks include output overcurrent protection,
thermal sensor, PGOOD detectors, RESET function and
shutdown logic.
Synchronous Buck Regulator
The synchronous buck regulator with integrated N- and
P-channel power MOSFETs and external voltage setting
resistors provides for adjustable voltages from the PWM.
Synchronous rectification with internal MOSFETs is used to
achieve higher efficiency and reduced number of external
components. Operating frequency is typically 750kHz
allowing the use of smaller inductor and capacitor values.
The device can be synchronized to an external clock signal
in the range of 500kHz to 1MHz. The PG_PWM output
indicates loss of regulation on PWM output.
The PWM architecture uses a peak current mode control
scheme with internal slope compensation. At the beginning
of each clock cycle, the high side P-channel MOSFET is
turned on. The current in the inductor ramps up and is
FN9196.0
December 21, 2005
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| ISL6504A | 制造商:Intersil Corporation 功能描述: |
| ISL6504ACB | 功能描述:IC MULTIPLE POWER CTRLR 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ISL6504ACBN | 功能描述:IC MULTIPLE POWER CTRLR 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ISL6504ACBN-T | 功能描述:IC MULTIPLE POWER CTRLR 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ISL6504ACB-T | 功能描述:IC MULTIPLE POWER CTRLR 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
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