參數(shù)資料
型號(hào): LTC3446IDE#PBF
廠商: Linear Technology
文件頁(yè)數(shù): 3/20頁(yè)
文件大?。?/td> 283K
描述: IC REG TRPL BCK/LINEAR 14-DFN
標(biāo)準(zhǔn)包裝: 91
拓?fù)洌?/td> 降壓(降壓)同步(1),線性(LDO)(2)
功能: 任何功能
輸出數(shù): 3
頻率 - 開關(guān): 2.25MHz
電壓/電流 - 輸出 1: 可調(diào)至0.8V,1A
電壓/電流 - 輸出 2: 可調(diào)至0.4V,300mA
電壓/電流 - 輸出 3: 可調(diào)至0.4V,300mA
帶 LED 驅(qū)動(dòng)器: 無(wú)
帶監(jiān)控器: 無(wú)
帶序列發(fā)生器: 無(wú)
電源電壓: 0.9 V ~ 5.5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 14-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 14-DFN-EP(4x3)
包裝: 管件
LTC3446
3
3446ff
elecTrical characTerisTics
 
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
 = 25癈. V
IN
 = 3.6V unless otherwise specified. (Note 2)
SYMBOL  PARAMETER
CONDITIONS
MIN  TYP   MAX   UNITS
V
PG(THRESH)
PGOOD Threshold (Note 8)
?/DIV>
8    10
%
R
PGOOD
PGOOD Output Resistance
PGOOD Low, Sinking 1mA
?/DIV>
87   180
?/DIV>
I
PGOOD
PGOOD Hi-Z Leakage Current
V
PGOOD
 = 6V
?/DIV>
1
礎(chǔ)
Synchronous Buck Converter
I
BUCKFB
Feedback Current
(Note 5)
?/DIV>
?0
nA
V
BUCKFB
Regulated Feedback Voltage
(Note 5)
?SPAN class="pst LTC3446IDE-PBF_2464228_7">  0.788  0.800  0.812
V
V
BUCKFB
Feedback Voltage Line Regulation
V
IN
 = 2.7V to 5.5V (Note 5)
?/DIV>
0.3   0.5   mV/V
I
MAXP
Maximum Peak Inductor Current
V
BUCKFB
 = 0V, Duty Cycle < 35%
1.2  1.55   2.0
A
I
MAXN
NMOS Overcurrent Limit
1.8
A
Feedback Voltage Load Regulation
(with Respect to V
ITH
)
V
ITH
 = 0.5V to 1V, V
MODESEL
 = V
IN
 (Note 5)
0.5
mV/V
f
OSC
Oscillator Frequency
?SPAN class="pst LTC3446IDE-PBF_2464228_7">  1.8  2.25   2.7    MHz
R
PFET
R
DS(ON)
 of P-Channel FET
I
SW
 = 500mA
0.13
?/DIV>
R
NFET
R
DS(ON)
 of N-Channel FET
I
SW
 = 500mA
0.14
?/DIV>
I
LSW
SW Leakage
V
ENBUCK
 = 0V, V
SW
 = 0V or 5.5V, V
IN
 = 5.5V
?
礎(chǔ)
V
ENBUCK
Buck Enable Pin Threshold
?SPAN class="pst LTC3446IDE-PBF_2464228_7">  0.3  0.65   1
V
I
ENBUCK
Buck Enable Pin Leakage Current
V
ENBUCK
 = 5.5V, All Other Pins Grounded
?/DIV>
1
礎(chǔ)
V
MODESEL
Mode Select Pin Threshold
?/DIV>
0.3  0.65   1
V
I
MODESEL
Mode Select Pin Leakage Current
V
MODESEL
 = 5.5V, All Other Pins Grounded    ?/SPAN>
1
礎(chǔ)
g
m
Error Amplifier Transconductance
V
ITH
 = 0.6V
450  700   950    礎(chǔ)/V
Each VLDO: V
IN
 = 3.6V, V
LVIN
 = 1.5V, V
LVOUT
 = 1.2V, Unless Otherwise Specified
V
LVIN
LV
IN
 Pin Operating Voltage
(Note 6)
?/DIV>
0.9
5.5
V
I
LVIN
LV
IN
 Pin Operating Current
I
OUT
 = 10礎(chǔ)
?/DIV>
3    20
礎(chǔ)
LV
IN
 Shutdown Current
V
ENLDO
 = 0V
1.5    2
礎(chǔ)
V
LVFB
Feedback Pin Regulation Voltage (Note 7)    1mA d I
OUT
 d 300mA, 1.5V d V
LVIN
 d 5.5V     
?/DIV>
0.395
0.392
0.400
0.400
0.405
0.408
V
V
I
LVFB
Feedback Pin Input Current
V
LVFB
 at Regulation
?/DIV>
2   ?0
nA
I
LVOUT(MAX)
Continuous Output Current
?SPAN class="pst LTC3446IDE-PBF_2464228_7">  300
mA
Short-Circuit Output Current
760
mA
V
ENLDOx
LDO Enable Pin Threshold
?SPAN class="pst LTC3446IDE-PBF_2464228_7">  0.3  0.65   1
V
I
ENLDOx
LDO Enable Pin Leakage Current
V
ENLDOx
 = 5.5V, All Other Pins Grounded
?/DIV>
1
礎(chǔ)
Output Voltage Load Regulation
(Referred to the LV
FB
 Pin)
I
OUT
 = 1mA to 300mA
1
mV/A
L
VFB
 Line Regulation (with Respect to
the L
VIN
 Pin)
V
LVIN
 = 1.5V to 5.5V, V
IN
 = 3.6V, V
LVOUT
 = 1.2V,
I
OUT
 = 1mA
7.5
礦/V
L
VFB
 Line Regulation (with Respect to
the V
IN
 Pin)
V
LVIN
 = 1.5V, V
IN
 = 2.7V to 5.5V, V
LVOUT
 = 1.2V,
I
OUT
 = 1mA
0.44
mV/V
V
DO
LV
IN
  LV
OUT
 Dropout Voltage
V
IN
 = 2.8V, V
LVIN
 = 1.5V, V
LVFB
 = 0.37V,
I
OUT
 = 300mA (Note 9)
68   175    mV
V
IN
 to LV
OUT
 Headroom Required for
Regulation (Note 3)
I
LVOUT
 = 300mA
l
1.4
V
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