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参数资料
| 型号： | LT1571-5 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | Constant-Current/ Constant-Voltage Battery Charger with Preset Voltage and Termination Flag |
| 中文描述： | 恒流/恒压电池充电器预置电压和终止旗 |
| 文件页数： | 4/16页 |
| 文件大小： | 201K |
| 代理商： | LT1571-5 |
4
LT1571 Series
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LT1571 is guaranteed to meet performance specifications
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.
Note 3:
Sense resistor R
S1
and package bond wires.
Note 4:
Current (
≈
700
μ
A) flows into the pins during normal operation and
also when an external shutdown signal on the V
C
pin is greater than 0.3V.
Current decreases to
≈
200
μ
A and flows out of the pins when external
shutdown holds the V
C
pin below 0.3V but above shutdown threshold.
Current drops to near zero when input voltage collapses. See External
Shutdown in Applications Information section.
The
G
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C.
V
CC
= 16V (LT1571-1, LT1571-2), V
CC
= 10V (LT1571-5), V
BAT
= 8V (LT1571-1,LT1571-2), V
BAT
= 4V (LT1571-5), maximum operating
V
CC
= V
MAX
= 26V, no load on any outputs unless otherwise noted. (Note 6)
Note 5:
A linear interpolation can be used for reference voltage
specification between 0
°
C and –40
°
C.
Note 6:
Maximum allowable ambient temperature may be limited by power
dissipation. Parts may not necessarily be operated simultaneously at
maximum power dissipation and maximum ambient temperature.
Temperature rise calculations must be done as shown in the Applications
Information section to ensure that maximum junction temperature does
not exceed the 125
°
C limit. With high power dissipation, maximum
ambient temperature may be less than 70
°
C.
Note 7:
91% maximum duty cycle is guaranteed by design if V
BAT
or V
X
(see Figure 7 in Application Information) is kept between 3V and 5V.
Note 8:
See “Lithium-Ion Charging Completion” in the Applications
Information section.
ELECTRICAL CHARACTERISTICS
PARAMETER
Switch
Switch ON Resistance
CONDITIONS
MIN
TYP
MAX
UNITS
I
SW
= 1.5A, V
BOOST
– V
SW
≥
2V
I
SW
= 1A, V
BOOST
– V
SW
< 2V (Unboosted)
V
BOOST
= (V
CC
+ 8V), I
SW
≤
1A
V
SW
= 0V, V
CC
≤
20V
V
SW
= 0V, 20V < V
CC
≤
26V
G
G
0.3
0.5
2.0
35
100
200
V
CC
– 2
27
I
BOOST
/
I
SW
During Switch ON
Switch OFF Leakage Current
20
2
4
mA/A
μ
A
μ
A
V
μ
A
mA
Maximum V
BAT
with Switch ON
Minimum I
PROG
for Switch ON
Minimum I
PROG
for Switch OFF
Current Sense Amplifier Inputs (SENSE, BAT)
Sense Resistance (R
S1
)
Total Resistance from SENSE to BAT (Note 3)
BAT Bias Current (Note 4)
G
1
1
4
G
2.4
0.08
0.2
–200
700
0.12
0.25
–375
1300
5
μ
A
μ
A
μ
A
V
C
< 0.3V
V
C
> 0.6V
V
C
< 40mV
G
Oscillator
Switching Frequency
LT1571-1, LT1571-2
LT1571-5
All Conditions of V
CC
, Temperature,
LT1571-1, LT1571-2
LT1571-1, LT1571-2, T
J
< 0
°
C
LT1571-5
LT1571-5, T
J
< 0
°
C
LT1571-1, LT1571-2
LT1571-1, LT1571-2, T
A
= 25
°
C (Note 7)
LT1571-5
180
440
200
500
220
550
kHz
kHz
Switching Frequency Tolerance
G
G
G
G
170
160
425
400
87
90
77
200
230
230
575
575
kHz
kHz
kHz
kHz
%
%
%
500
Maximum Duty Cycle
G
93
81
G
Current Amplifier (CA2)
Transconductance
Maximum V
C
for Switch OFF
I
VC
Current (Out of Pin)
V
C
= 1V, I
VC
=
±
1
μ
A
125
210
550
0.6
100
3
300
μ
mho
G
V
V
C
≥
0.6V
0.2V < V
C
< 0.45V
V
C
< 40mV (Shutdown)
μ
A
mA
μ
A
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