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LTC3351

更新时间： 2024-01-14 16:07:26
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
26页 965K
描述
2.5A Supercapacitor Backup Power Manager

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LTC3351 数据手册

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LTC4041  
ELECTRICAL CHARACTERISTICS The ldenotes the specifications which apply over the specified operating  
temperature range, otherwise specifications are at TA = 25°C. (Note 3) VIN = VSYS = 5V, VSCAP = 2.5V, RPROG = 2k, unless otherwise noted.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
5.5  
UNITS  
l
l
V
V
Input Voltage Range  
2.9  
V
V
IN  
Supercapacitor Voltage Range (Backup  
Boost Input)  
5.4  
SCAP  
Quiescent Current in Charger Mode with  
Charging Complete and Backup Boost  
Active (CAPSEL = 1)  
V
and V  
Total Quiescent Current  
800  
13  
1600  
26  
µA  
µA  
IN  
SYS  
SCAP Quiescent Current  
Quiescent Current in Charger Mode with  
Charging Complete and Backup Boost in  
Sleep (CAPSEL = 1)  
V
and V Total Quiescent Current  
275  
13  
550  
26  
µA  
µA  
IN  
SYS  
SCAP Quiescent Current  
l
l
Quiescent Current in Backup Mode with  
Backup Boost in Sleep  
IN  
V
Quiescent Current  
75  
1
150  
2
µA  
µA  
SYS  
SCAP Quiescent Current  
(V = 0V, CAPSEL = 1)  
Quiescent Current in Shutdown  
V
Quiescent Current  
5.5  
0
11  
1
µA  
µA  
IN  
(CHGEN = BSTEN = CAPSEL = 1, V  
= 0V)  
SYS  
l
l
SCAP Quiescent Current  
Buck Supercapacitor Charger  
V
CAPFB Pin Servo Voltage  
0.788  
–50  
0.80  
0
0.812  
50  
V
nA  
CAPFB  
CAPFB  
CHG  
I
I
CAPFB Pin Input Leakage Current  
Regulated Supercapacitor Charge Current  
R
= 2k, V  
>1V  
950  
1000  
1050  
mA  
PROG  
SCAP  
V
-to-V  
Differential Undervoltage  
(V  
(V  
– V  
– V  
) Falling  
SCAP  
) Rising  
SCAP  
30  
100  
50  
150  
70  
200  
mV  
mV  
SYS  
SCAP  
SYS  
SYS  
Lockout Threshold  
V
PROG  
PROG Pin Servo Voltage  
800  
mV  
h
Ratio of Charge Current to PROG Pin Current  
Input Current Limit Threshold Voltage  
2500  
mA/mA  
PROG  
V
– V  
23.5  
22  
25  
25  
26.5  
28  
mV  
mV  
IN  
CLN  
l
A
V
Input Current Limit Amplifier Gain  
CLN Input Bias Current  
Ratio of V  
to (V – V )  
CLN  
32  
V/V  
nA  
IMON  
IMON  
IN  
V
= V  
300  
CLN  
IN  
Recharge Threshold Voltage  
End-of-Charge Indication  
As a Percentage of the Regulated V  
PROG Pin Average Voltage  
96.2  
90  
97.5  
100  
92.5  
2.5  
98.8  
%
RECHRG  
SCAP  
mV  
%
CAPGD Rising Threshold  
As a Percentage of the Regulated V  
As a Percentage of the Regulated V  
95  
SCAP  
Hysteresis  
%
SCAP  
f
Step-Down Converter Switching Frequency  
High Side Switch On-Resistance  
Low Side Switch On-Resistance  
PMOS Switch Current Limit  
V
>1V  
SCAP  
2.0  
2.25  
130  
120  
4.3  
2.5  
MHz  
mΩ  
mΩ  
A
OSC(BUCK)  
R
R
P(BUCK)  
N(BUCK)  
I
3
LIM(BUCK)  
Supercapacitor Balancer  
V
Supercapacitor Balance Point  
Balancer Source Current  
Balancer Sink Current  
As a Percentage of V  
, V = 5V  
SCAP SCAP  
49  
50  
50  
50  
2.7  
51  
%
mA  
mA  
V
BAL  
I
I
V
V
= 5V, V  
= 5V, V  
= 2.4V  
SOURCE  
SINK  
SCAP  
SCAP  
BAL  
BAL  
= 2.6V  
l
l
Top/Bottom Supercapacitor Overvoltage  
Threshold  
(V  
SCAP  
– V ) and/or V Rising, CAPSEL = 1  
2.8  
BAL  
BAL  
Hysteresis  
55  
mV  
mV  
Top/Bottom Supercapacitor Undervoltage  
Threshold  
(V  
SCAP  
– V ) and/or V Falling, CAPSEL = 1  
–50  
–20  
BAL  
BAL  
Hysteresis  
30  
mV  
Rev A  
3
For more information www.analog.com  
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