參數(shù)資料
型號(hào): NCP1578MNR2G
廠商: ON Semiconductor
文件頁(yè)數(shù): 4/22頁(yè)
文件大?。?/td> 1861K
描述: IC REG DL BCK/LINEAR SYNC 20-QFN
產(chǎn)品變化通告: Product Obsolescence 19/Dec/2008
標(biāo)準(zhǔn)包裝: 4,000
拓?fù)洌?/td> 降壓(降壓)同步(1),線性(LDO)(1)
功能: 任何功能
輸出數(shù): 2
頻率 - 開關(guān): 300kHz
電壓/電流 - 輸出 1: 控制器
電壓/電流 - 輸出 2: 5V,50mA
帶 LED 驅(qū)動(dòng)器:
帶監(jiān)控器:
帶序列發(fā)生器:
電源電壓: 4.5 V ~ 24 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 20-QFN(4x4)
包裝: 帶卷 (TR)
NCP1578
http://onsemi.com
4
PIN FUNCTION DESCRIPTION
Pin No.
Symbol
Description
1
FPWM
FPWM or Power Saving Control. Logic high enables force PWM. Logic low enables power saving
operation.
2
EN_LDO
LDO enable input. The 5 V LDO is enabled if EN_LDO is high and disabled if it is low. This pin can
sustain voltage as high as VBAT.
3
OCSET
Input pin for over current threshold setting for high side gate driver. Also it is for the internal ramp gen
erator to implement the voltage feed forward rejection to the input voltage variation
4
FOFF
Fault OFF. If it pulls to high, it disables the features of OCP, UVLO and OVP. Normally it should be tied
to ground. This pin is internally pulled down.
5
EN_SW
PWM controller's enable input. The switching controller is enabled if EN_SW is high and disabled if
EN is low.
6
LDO5
5.0 V linear regulator output.
7
VBAT
Battery/adaptor voltage input.
8
AGND
Analog ground.
9
NC
Not connected
10
FB
Feedback input from controller's output voltage.
11
COMP
Error amplifier output pin.
12
SS
Soft-start (for switcher) capacitor connection to ground.
13
PGOOD
Power good signal open drain output. High impedance (open drain) if power is good (in regulation).
Low impedance if power is not good.
14
PGDLY
Power good delay capacitor connection to ground.
15
PGND
Power ground.
16
BG
Gate driver output for low-side N-Channel power FET.
17
VCCP
Power Input voltage pin.
18
SWN
Inductor driven node of the SMPS, the return for high-side gate driver, and also serve as the lower
supply rail of the high-side gate driver of the SMPS.
19
TG
Gate driver output for high-side N-Channel power FET.
20
VBST
Positive supply of high-side gate driver of the SMPS. Connect boost capacitor between this pin and
switching node SWN of the SMPS.
21
THPAD
Copper pad on bottom of IC used for heatsinking. This pin should be connected to the ground plane
under the IC.
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