LT1769
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 16V, VBAT = 8V. No load on any outputs unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
0.6
±3
MAX
UNITS
Voltage Amplifier VA
Transconductance (Note 3)
Output Source Current
OVP Input Bias Current
Output Current from 50µA to 500µA
0.25
1.1
1.3
mho
mA
V
OVP
= V + 10mV, V
= V + 10mV
REF
PROG REF
VA Output Current at 0.5mA
VA Output Current at 0.5mA, T > 90°C
VA Output Current at 0.5mA, T < 0°C
●
●
±10
25
±15
nA
nA
nA
–15
A
A
Current Limit Amplifier CL1, 8V
Turn-On Threshold
≤ Input Common Mode
0.5mA Output Current
93
100
1
110
2
mV
mho
µA
Transconductance
Output Current from 50µA to 500µA
0.5
CLP Input Current
0.5mA Output Current, V ≥ 0.4V
0.3
0.8
1
UV
CLN Input Current
0.5mA Output Current V ≥ 0.4V
2
mA
UV
Note 3: Tested with Test Circuit 2.
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 4: A linear interpolation can be used for reference voltage
specification between 0°C and –40°C.
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
ICC vs Duty Cycle
ICC vs VCC
Efficiency of Figure 1 Circuit
7.0
6.5
6.0
5.5
5.0
4.5
100
98
96
94
92
90
88
86
84
82
80
8
7
6
5
4
3
2
1
0
MAXIMUM DUTY CYCLE
V
= 16V
V
V
= 16.5
= 8.4V
CC
IN
BAT
T
= 0°C
J
T
= 25°C
J
T
= 0°C
J
CHARGER EFFICIENCY
T
= 125°C
J
T
= 125°C
J
T
= 25°C
J
INCLUDES LOSS
IN DIODE D3
0
10
15
(V)
20
25
30
40
5
0
10 20 30
50 60 70 80
0.2
0.6
1.0
I
1.4
(A)
1.8
2.2
V
DUTY CYCLE (%)
CC
BAT
1769 G03
1769 G02
1769 G01
1769fa
4
Linear Systems [ Linear Systems ]
