Datasheet

4
LT1511
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 16V, V
BAT
= 8V, V
MAX
(maximum operating V
CC
) = 28V.
No load on any outputs unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Voltage Amplifier VA
Transconductance (Note 3) Output Current from 50µA to 500µA 0.25 0.6 1.3 mho
Output Source Current V
OVP
= V
REF
+ 10mV, V
PROG
= V
REF
+ 10mV 1.1 mA
OVP Input Bias Current At 0.75mA VA Output Current ±3 ±10 nA
At 0.75mA VA Output Current, T
J
> 90°C –15 25 nA
Current Limit Amplifier CL1, 8V ≤ Input Common Mode
Turn-On Threshold 0.75mA Output Current 93 100 107 mV
Transconductance Output Current from 50µA to 500µA 0.5 1 2 mho
CLP Input Current 0.75mA Output Current, V
UV
≥ 0.4V 0.3 1 µA
CLN Input Current 0.75mA Output Current V
UV
≥ 0.4V 0.8 2 mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Tested with Test Circuit 1.
Note 3: Tested with Test Circuit 2.
Note 4: A linear interpolation can be used for reference voltage
specification between 0°C and –40°C.
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Thermally Limited Maximum
Charging Current Efficiency of Figure 1 Circuit
DUTY CYCLE (%)
010305070
I
CC
(mA)
80
1511 • TPC03
20
40
60
8
7
6
5
4
3
2
1
0
125°C
0°C
25°C
V
CC
= 16V
I
CC
vs Duty Cycle
INPUT VOLTAGE (V)
5
MAXIMUM CHARGING CURRENT (A)
3.0
2.8
2.6
2.4
2.2
2.0
25
1511 • TPC01
10
15
20
30
(θ
JA
=30°C/W)
T
AMAX
=60°C
T
JMAX
=125°C
4.2V BATTERY
V
IN
≥ 8V
8.4V BATTERY
V
IN
≥ 11V
12.6V BATTERY
16.8V BATTERY
NOTE: FOR 4.2V AND 8.4V BATTERIES MAXIMUM
CHARGING CURRENT IS 3A FOR V
IN
– V
BAT
≥ 3V
I
BAT
(A)
0.2
EFFICIENCY (%)
100
98
96
94
92
90
88
86
84
82
80
1.0
1.8 3.02.62.2
1511 • TPC02
0.6 1.4
V
IN
= 16.5
V
BAT
= 8.4V
CHARGER EFFICIENCY
INCLUDES LOSS
IN DIODE D3