LT1505CG-1 Ver la hoja de datos (PDF) - Linear Technology
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LT1505CG-1 Datasheet PDF : 16 Pages
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LT1505
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 18V, VBAT = 12.6V, VCLN = VCC (LT1505), no load on any
outputs unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Voltage Amplifier VA
Transconductance (Note 3)
Output Current from 50µA to 500µA
0.21
0.6
1.0
Output Source Current
VFB Input Bias Current
Current Limit Amplifier CL1
VFB = VPROG = VREF + 10mV
At 0.5mA VA Output Current, TA = 25°C
At 0.5mA VA Output Current, TA = 70°C
(3 CELL, 4.1V, 4.2V Are Not Connected, VBAT2 = 0V)
1.1
±3
± 10
– 10
25
Turn-On Threshold
0.5mA Output Current
87
92
97
Transconductance
Output Current from 50µA to 500µA
0.5
1
3
CLP Input Current
0.5mA Output Current
1
3
CLN Input Current
0.5mA Output Current
0.8
2
Input P-Channel FET Driver (INFET)
INFET “On” Clamping Voltage (VCC – VINFET)
INFET “On” Driver Current
INFET “Off” Clamping Voltage (VCC – VINFET)
INFET “Off” Drive Current
Charging Completion Flag (Comparator E6)
VCC ≥ 11V
VINFET = VCC – 6V
VCC Not Connected, IINFET < – 2µA
VCC Not Connected, (VCC – VINFET) ≥ 2V
q 6.5
7.8
9
q
8
20
1.4
– 2.5
Charging Completion Threshold (Note 6)
Threshold On CAP Pin
Measured at VRS1, VCAP = 2V (Note 7)
Low to High Threshold
High to Low Threshold
14
20
28
q
3.3
4.2
q 0.6
VCAP at Shutdown
FLAG (Open Collector) Output Low
FLAG Pin Leakage Current
Gate Drivers (TGATE, BGATE)
VSHDN = Low (Shutdown)
VCAP = 4V, IFLAG < 1mA
VCAP = 0.6V
q
0.13
0.3
q
0.3
q
3
VGBIAS
VTGATE High (VTGATE – VSW)
VBGATE High
VTGATE Low (VTGATE – VSW)
VBGATE Low
Peak Gate Drive Current
11V < VCC < 24V, IGBIAS ≤ 15mA
VSHDN = Low (Shutdown)
ITGATE ≤ 20mA, VBOOST = VGBIAS – 0.5V
IBGATE ≤ 20mA
ITGATE ≤ 50mA
IBGATE ≤ 50mA
10nF Load
q 8.4
8.9
9.3
q
1
3
q 5.6
6.6
q 6.2
7.2
q
0.8
q
0.8
1
Gate Drive Rise and Fall Time
1nF Load
25
VTGATE, VBGATE at Shutdown
VSHDN = Low (Shutdown)
ITGATE = IBGATE = 10µA
q
1
UNITS
mho
mA
nA
nA
mV
mho
µA
mA
V
mA
V
mA
mV
V
V
V
V
µA
V
V
V
V
V
V
A
ns
V
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: When VCC and battery voltage differential is low, high duty factor
is required. The LT1505 achieves a duty factor greater than 99% by
skipping cycles. Only when VBOOST drops below the comparator A2
threshold will TGATE be turned off. See Applications Information.
Note 5: When the system starts, C2 (boost cap) has to be charged up to
drive TGATE and to start the system. The LT1505 will keep TGATE off and
turn BGATE on for 0.2µs at 200kHz to charge up C2. Comparator A2
senses VBOOST and switches to the normal PWM mode when VBOOST is
above the threshold.
Note 6: See “Lithium-Ion Charging Completion” in the Applications
Information Section.
Note 7: Tested with Test Circuit 3.
Note 8: ISPIN keeps switching on to keep VBAT regulated when battery is
not present to avoid high surge current from COUT when battery is
inserted.
Note 9: Above undervoltage threshold switching is enabled.
Note 10: Do not connect VCC directly to VIN (see Figure 1). This connection
will cause the internal diode between VBAT and VCC to be forward-biased
and may cause high current to flow from VIN. When the adapter is
removed, VCC will be held up by the body diode of M1.
4
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