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LT1769IGN Datasheet(PDF) 3 Page - Linear Technology

No. de pieza LT1769IGN
Descripción Electrónicos  Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting
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LT1769IGN Datasheet(HTML) 3 Page - Linear Technology

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LT1769
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 16V, VBAT = 8V, RS2 = RS3 = 200Ω (see Block Diagram),
VCLN = VCC. No load on any outputs unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Overall
Boost Pin Current
VCC = 20V, VBOOST = 0V
0.1
10
µA
VCC = 28V, VBOOST = 0V
0.25
20
µA
2V
≤ VBOOST – VCC < 8V (Switch ON)
6
9
mA
8V
≤ VBOOST – VCC ≤ 25V (Switch ON)
8
12
mA
Switch
Switch ON Resistance
8V
≤ VCC ≤ VMAX, ISW = 2A,
VBOOST – VSW ≥ 2V
q
0.15
0.25
Ω
∆IBOOST/∆ISW During Switch ON
VBOOST = 24V, ISW ≤ 2A
25
35
mA/A
Switch OFF Leakage Current
VSW = 0V, VCC ≤ 20V
q
2
100
µA
20V < VCC ≤ 28V
q
4
200
µA
Minimum IPROG for Switch ON
q
24
20
µA
Minimum IPROG for Switch OFF
q
1
2.4
mA
Maximum VBAT for Switch ON
q
VCC – 2
V
Current Sense Amplifier CA1 Inputs (Sense, BAT)
Input Bias Current
q
– 50
– 125
µA
Input Common Mode Low
q
– 0.25
V
Input Common Mode High
q
VCC – 2
V
SPIN Input Current
– 100
– 200
µA
Reference
Reference Voltage (Note 3)
RPROG = 4.93k, Measured at OVP with
VA Supplying IPROG and Switch OFF
2.448
2.465
2.477
V
Reference Voltage
All Conditions of VCC,TA ≥ 0°C
q
2.441
2.489
V
TA < 0°C (Note 4)
q
2.43
2.489
V
Oscillator
Switching Frequency
180
200
220
kHz
Switching Frequency
All Conditions of VCC,TA ≥ 0°C
q
170
200
230
kHz
TA < 0°C
q
160
230
kHz
Maximum Duty Cycle
90
93
%
q
85
%
Current Amplifier CA2
Transconductance
VC = 1V, IVC = ±1µA
150
250
550
µmho
Maximum VC for Switch OFF
q
0.6
V
IVC Current (Out of Pin)
VC ≥ 0.6V
100
µA
VC < 0.45V
3
mA



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