參數(shù)資料
型號: BD9153MUV-E2
廠商: Rohm Semiconductor
文件頁數(shù): 10/21頁
文件大小: 630K
描述: IC REG TRPL BCK/LINEAR 24VQFN
特色產(chǎn)品: CMOS LDO Regulators
標準包裝: 1
拓撲: 降壓(降壓)同步(2),線性(LDO)(1)
功能: 任何功能
輸出數(shù): 3
頻率 - 開關(guān): 1MHz
電壓/電流 - 輸出 1: 1.8 V ~ 3.3 V,1.5A
電壓/電流 - 輸出 2: 0.8 V ~ 2.5 V,1.5A
電壓/電流 - 輸出 3: 控制器
帶 LED 驅(qū)動器:
帶監(jiān)控器:
帶序列發(fā)生器:
電源電壓: 4.5 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 24-VQFN
包裝: 標準包裝
其它名稱: BD9153MUV-E2DKR
Technical Note
 
10/18 
www.rohm.com
2009.08 - Rev.A
?2009 ROHM Co., Ltd. All rights reserved.
BD9153MUV 
鸖hort-current protection circuit with time delay function
Turns OFF the output to protect the IC from breakdown when the incorporated current limiter is activated continuously for
the fixed time(TLATCH) or more. The output thus held tuned OFF may be recovered by restarting EN or by re-unlocking
UVLO.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig.33 Short-current protection circuit with time delay timing chart
 
?SPAN class="pst BD9153MUV-E2_2471427_8">Switching regulator efficiency 
Efficiency K may be expressed by the equation shown below:
 
 
 
 
Efficiency may be improved by reducing the switching regulator power dissipation factors P
D
?as follows:
 
Dissipation factors:
1) ON resistance dissipation of inductor and FETPD(I
2
R)
2) Gate charge/discharge dissipationPD(Gate)
3) Switching dissipationPD(SW)
4) ESR dissipation of capacitorPD(ESR)
5) Operating current dissipation of ICPD(IC)
 
1)PD(I
2
R)=IOUT
2
?RCOIL+RON)
    (RCOIL[&]DC resistance of inductor, RON[&]ON resistance of FET, IOUT[A]Output current.)
2)PD(Gate)=Cgs譮譜 (Cgs[F]Gate capacitance of FET, f[H]Switching frequency, V[V]Gate driving voltage of FET)
 
    
 
4)PD(ESR)=IRMS
2
譋SR (IRMS[A]Ripple current of capacitor, ESR[&]Equivalent series resistance.)
5)PD(IC)=Vin譏CC (ICC[A]Circuit current.)
 
?
VOUTOUT
Vin譏in
?00[%]=
POUT
Pin
?00[%]=
POUT
POUT+PD?
?00[%]
Vin
2
RSSOUT
IDRIVE
3)PD(SW)=
(CRSS[F]Reverse transfer capacitance of FET, IDRIVE[A]Peak current of gate.)
Output Short circuit
 Threshold Voltage
IL Limi
EN
Timer latch
EN
Standby
mode
Operating mode
Operating mode
Standby
mode
 
EN
 
t2LATCH 
OUT2
Io1
t1LATCH 
 
Output OFF
Latch
OUT1
OUT3
t3=TLATCH 
Io2
Io3
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