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參數(shù)資料
| 型號： | LTC3445EUF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | I2C Controllable Buck Regulator with Two LDOs in a 4mm ?4mm QFN |
| 中文描述： | 0.8 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大小： | 465K |
| 代理商： | LTC3445EUF |
4
LTC3445
3445fa
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LTC3445EUF is guaranteed to meet performance specifica-
tions from 0
°
C to 70
°
C. Specifications over the –40
°
C to 85
°
C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
temperature range, otherwise specifications are at T
A
= 25
°
C. V
CC1
= V
CC2
= 3.6V, unless otherwise noted.
Note 3:
T
J
is calculated from the ambient temperature, T
A
, and power
dissipation, P
D
, according to the following formula:
T
J
= T
A
+ P
D
37
°
C/W
Note 4:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5:
Determined by design, not production tested.
The
●
denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
SYMBOL
t
SU(RSTA)
t
SU(STOP)
t
HD(DIN)
t
SU(DAT)
V
THR
V
HYS
I
LVTRACK
I
LVBACKUP
I
LADD7
I
LADD6
I
LSCL
I
LSDA
I
LLDO1
I
LLDO2
I
LLDO1FB
I
LLDO2FB
I
LBATTFAULT
I
FB1,2
PARAMETER
Repeated Start Condition Setup Time
Stop Condition Setup Time
Data Hold Time, Input
Data Setup Time
SCL and SDA Logic Input Threshold
SCL and SDA Logic Input Hysteresis
V
TRACK
Leakage
V
BACKUP
Leakage
ADD7 Leakage
ADD6 Leakage
SCL Leakage
SCL Leakage
LDO1 Leakage
LDO2 Leakage
LDO1FB Leakage
LDO2FB Leakage
BATTFAULT Leakage
LDO Feedback Input Current
CONDITIONS
(Note 5)
(Note 5)
(Note 5)
(Note 5)
MIN
TYP
MAX
600
600
0
100
UNITS
ns
ns
ns
ns
V
mV
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
1.8
50
1.44
(Note 5)
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V, RUN = 0
V
CC
= 3.6V, RUN = 0
V
CC
= 3.6V, RUN = 0
V
CC
= 3.6V, RUN = 0
V
CC
= 3.6V
V
FB1
= 0.6V
2.2
1
1
1
1
1
1
1
1
1
1
1
●
●
●
●
●
●
●
●
●
●
●
TYPICAL PERFOR U
Supply Current vs Supply Voltage
SUPPLY VOLTAGE (V)
2.4
S
μ
A
300
400
500
3.6
4.4
5.6
3445 G01
200
100
0
2.8
3.2
4
4.8
5.2
ALL ON
BUCK
TWO LDOs
RUN = HIGH
RUN = LOW
ONE LDO
V
OUT
vs DAC
DAC VALUE
0
V
O
1.2
1.4
80
3445 G02
1.0
0.8
20
40
60
10
30
50
70
1.6
1.1
1.3
0.9
1.5
0mA
600mA
DAC VALUE
0
V
O
O
0.008
0.010
0.012
80
3445 G03
0.006
0.004
–0.002
20
40
60
10
30
50
70
0.002
0
0.016
0.014
100mA
V
OUT
Step Size vs DAC
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