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| 型号： | NCV8855BMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG QD BUCK/LINEAR 40QFN |
| 标准包装： | 1 |
| 拓扑： | 降压（降压）（2），线性（LDO）（2） |
| 功能： | 汽车无线电设备和仪表板电源 |
| 输出数： | 4 |
| 频率 - 开关： | 170kHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 可调式，2.5A |
| 电压/电流 - 输出 3： | 控制器 |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 9 V ~ 18 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 标准包装 |
| 其它名称： | NCV8855BMNR2GOSDKR |
NCV8855
THEORY OF OPERATION
Device Description
The NCV8855 is a multiple output controller / regulator
IC with an integrated high ? side load switch. The NCV8855
will address automotive radio system and instrument cluster
power supply requirements. In addition to the high ? side
load switch, the NCV8855 comprise a switch ? mode power
supply (SMPS) buck controller, a 2 A SMPS buck regulator,
and two low dropout linear regulator controllers (LDO). The
NCV8855 in combination with the ultra ? low Iq NCV861x
IC forms an eight output automotive radio or instrument
cluster power solution.
DRV_VPP 5V_IC
Linear Regulator Enable (LDO_EN)
The low ? dropout linear regulators (LDOs) have a
dedicated enable pin. This pin controls the startup and
shutdown of the LDOs. The SYS_EN pin must be logic high
for this pin to function. It is possible to drive this pin high
coincidentally with SYS_EN, but the LDO outputs will not
startup until DRV_VPP and 5V_IC have increased above its
UVLO thresholds.
High ? Side Switch Enable (HS_EN)
The high ? side switch enable controls only the high ? side
switch. Similar to LDO_EN, the SYS_EN pin must be logic
high for this pin to function. The voltage level on all enable
22
35
pins have been designed to work with 3.3 V or 5 V logic.
4 SYNC/
SYS_EN 5
BST1 25
GH1 24
SN1 23
GL1 21
OCSET 27
SW_FB1 29
COMP1 30
MAIN
6 LDO_EN
8 HOT_FLG
11 BST2
10 VIN_SW
9 SN2
3 SW_FB2
2 COMP2
ROSC
IC Power (VIN, VIN_SW, DRV_VPP, 5V_IC)
There are many input voltage rails for the NCV8855. The
main power supply input for the IC is VIN. The DRV_VPP,
5V_IC and the high ? side switch drain are all driven from
V IN . The DRV_VPP voltage rail is the power rail for SMPS1
& SMPS2’s gate driver circuits. The 5V_IC voltage rail is
the main supply for the IC. The VIN_SW rail is the supply
rail for SMPS2’s internal upper MOSFET. VIN_SW is
directly tied to the drain of the N ? channel MOSFET.
ISNS1+ 40
ISNS1 ? 39
LR_G1 1
LR_FB1 38
31
32
33
34
ISNS2+
ISNS2 ?
LR_G2
LR_FB2
VIN
High ? Side
Switch
SMPS2
Internal upper
MOSFET
VIN_SW
VIN 26
HS_S 28
HIGH ? SIDE
SWITCH
37 20
7 HS_EN
DRV_VPP
DRV_VPP
internal
regulator
5V_IC internal
regulator
5V_IC
AGND PGND
Figure 17.
The NCV8855 has an internally set switching frequency
of 170 kHz and provides an SYNC pin for external
frequency synchronization. The NCV8855 is designed to
operate within the range of 9 V to 18 V. The switch ? mode
power supplies are voltage ? mode controlled and the LDO
ISNS1+
ISNS1 ?
SMPS1 & 2
Gate Drivers
LDO1
Main IC
LDO2
I SNS2+
ISNS2 ?
controllers drive P ? channel MOSFETs as pass devices.
System Enable (SYS_EN)
The system enable (SYS_EN) pin is used to start device
operation or place it in low quiescent shutdown. Driving this
pin high will allow the two main internal voltage rails
(DRV_VPP and 5V_IC) to power up. These voltage rails
require external bypassing and have independent UVLO trip
points. Both rails must be operational in order for the IC to
function. After exceeding its UVLO threshold, the IC will
power up the switch ? mode power supplies with a soft ? start.
Conversely, a logic ? low on the pin will power down the
DRV_VPP and 5V_IC rails and place the IC in an ultra ? low
Figure 18.
Two additional inputs rails are ISNS1+ and ISNS2+.
These inputs not only serve as the positive reference for the
current sense circuit, but also serve as the supply rail for the
LDO error amplifier.
Startup and Shutdown Behavior
The startup sequence primary depends on the system
configuration. However, in every case, enable SYS_EN
first. The SYNC pin must not be held at logic high before
SYS_EN is enabled. Below shows typical startup and
current shutdown state.
http://onsemi.com
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8855BMNR2GEVB | 功能描述:电源管理IC开发工具 SMPS ASIC 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 |
| NCV8870 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Non-Synchronous Boost Controller |
| NCV887000 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Non-Synchronous Boost Controller |
| NCV887000D1R2G | 功能描述:低压差稳压器 - LDO Auto Grade Non-Sync Boost Controller RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV887001 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Non-Synchronous Boost Controller |
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