參數(shù)資料
型號(hào): LTC3445EUF#TRPBF
廠商: Linear Technology
文件頁數(shù): 2/24頁
文件大?。?/td> 475K
描述: IC REG TRPL BUCK/LINEAR 24-QFN
標(biāo)準(zhǔn)包裝: 2,500
拓?fù)洌?/td> 降壓(降壓)(1),線性(LDO)(2)
功能: 任何功能
輸出數(shù): 3
頻率 - 開關(guān): 1.5MHz
電壓/電流 - 輸出 1: 0.85 V ~ 1.55 V,600mA
電壓/電流 - 輸出 2: 可調(diào)至0.6V,50mA
電壓/電流 - 輸出 3: 可調(diào)至0.6V,50mA
帶 LED 驅(qū)動(dòng)器:
帶監(jiān)控器:
帶序列發(fā)生器:
電源電壓: 2.5 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-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 24-QFN 裸露焊盤(4x4)
包裝: 帶卷 (TR)
2
LTC3445
3445fa
Order Options  Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
ORDER PART NUMBER
(Note 1)
ABSOLUTE AXI U RATI GS   W
W
U
PACKAGE/ORDER I FOR ATIO
U
W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3445EUF
T
JMAX
 = 125癈, ?/DIV>
JA
 = 37癈/W, ?/DIV>
JC
 = 2.6癈/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
24
23
22
21
20
19
7
8
9
TOP VIEW
25
UF PACKAGE
24-LEAD (4mm ?4mm) PLASTIC QFN
10
11
12
6
5
4
3
2
1
13
14
15
16
17
18
V
TRACK
V
BACKUP
V
CC1
PGOOD
ADD7
SDA
V
CC
BATT
FB
NC
RUN
SW
NC
The ?/SPAN> denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
 = 25?/SPAN>C. V
CC1
 = V
CC2
 = 3.6V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
UF PART MARKING
3445
V
CC1
, V
CC2
, SDA, SCL Voltages.................. 0.3V to 6V
RUN, V
TRACK
, V
BACKUP
, PGOOD, ADD7,
ADD6, FB, V
CC
 BATT,
BATTFAULT Voltages.............................. 0.3V to V
CC1
SW Voltage................................ 0.3V to (V
CC1
+ 0.3V)
LDO1FB, LDO2FB Voltages..................... 0.3V to V
CC2
LDO1, LDO2 Voltages................ 0.3V to (V
CC2
+ 0.3V)
LDO1, LDO2 Source Current............................... 50mA
V
CC
 BATT Source Current...................................... 8mA
P-Channel Switch Source Current (DC)............. 800mA
N-Channel Switch Sink Current (DC)................. 800mA
Peak SW Sink and Source Current........................ 1.3A
LDO1, LDO2, V
CC
 BATT Output Short-Circuit
Duration.......................................................... Indefinite
Operating Temperature Range (Note 2)...40癈 to 85癈
Junction Temperature (Note 3)............................ 125癈
Storage Temperature Range................. 65癈 to 125癈
SYMBOL   PARAMETER
CONDITIONS
MIN   TYP   MAX    UNITS
V
CC1,
V
CC2
Input Voltage Range
?SPAN class="pst LTC3445EUF-TRPBF_2465416_4">   2.5
5.5
V
RUN
Run Threshold
?SPAN class="pst LTC3445EUF-TRPBF_2465416_4">   0.3    1    1.5
V
PGOOD   Reports Undervoltage of any Regulator
PGOOD = 0.4V
?SPAN class="pst LTC3445EUF-TRPBF_2465416_4">   3
mA
I
S
DC Bias Current (Shutdown)
RUN = 0
27   50
礎(chǔ)
DC Bias Current (Buck, LDO1, LDO2 Disabled)  RUN = V
CC1
105   150
礎(chǔ)
Buck Regulator
R
FB
Feedback Resistance
340
k&
V
OUT(MIN)
Regulated Output Voltage
I
OUT
 = 100mA, Burst Mode Operation    ?/SPAN>  0.824  0.850  0.875
V
Disabled
V
OUT(MAX)
Regulated Output Voltage
I
OUT
 = 100mA, Burst Mode Operation    ?/SPAN>  1.504  1.55  1.597
V
Disabled
V
OUT(STEP)
Output Voltage Step Size (0 to 48)
I
OUT
 = 100mA
?SPAN class="pst LTC3445EUF-TRPBF_2465416_4">  13.1   14.7   16.1
mV
Output Voltage Slew Rate = 00
I
OUT
 = 100mA, V
OUT
 = 0.85V to 1.55V
11.3
mV/祍
Output Voltage Slew Rate = 01
I
OUT
 = 100mA, V
OUT
 = 0.85V to 1.55V
7.5
mV/祍
Output Voltage Slew Rate = 10
I
OUT
 = 100mA, V
OUT
 = 0.85V to 1.55V
3.8
mV/祍
Output Voltage Slew Rate = 11
I
OUT
 = 100mA, V
OUT
 = 0.85V to 1.55V
0.9
mV/祍
I
PK
Peak Inductor Current
V
CC1
 = 3V, V
FB
 = 0.5V or V
OUT
 = 90%,
0.75   1   1.25
A
Duty Cycle < 35%
V
LOADREG
Output Voltage Load Regulation
0.5
%
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