LT1505CG Linear Technology, LT1505CG Datasheet - Page 4

• Manufacturer Part Number: LT1505CG
• Description: IC BATT CHARGER CONST I/V 28SSOP
• Manufacturer: Linear Technology

Specifications of LT1505CG

• Function: Charge Management
• Battery Type: Li-Ion, NiCd, NiMH
• Voltage - Supply: 11 V ~ 24 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

temperature range, otherwise specifications are at T
outputs unless otherwise noted.
LT1505
PARAMETER
Voltage Amplifier VA
Transconductance (Note 3)
Output Source Current
V
Current Limit Amplifier CL1
Turn-On Threshold
Transconductance
CLP Input Current
CLN Input Current
Input P-Channel FET Driver (INFET)
INFET “On” Clamping Voltage (V
INFET “On” Driver Current
INFET “Off” Clamping Voltage (V
INFET “Off” Drive Current
Charging Completion Flag (Comparator E6)
Charging Completion Threshold (Note 6)
Threshold On CAP Pin
V
FLAG (Open Collector) Output Low
FLAG Pin Leakage Current
Gate Drivers (TGATE, BGATE)
V
V
V
V
V
Peak Gate Drive Current
Gate Drive Rise and Fall Time
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 V
is required. The LT1505 achieves a duty factor greater than 99% by
skipping cycles. Only when V
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 0.2 s at 200kHz to charge up C2. Comparator A2
senses V
above the threshold.
ELECTRICAL CHARACTERISTICS
4
FB
CAP
GBIAS
TGATE
BGATE
TGATE
BGATE
TGATE
Input Bias Current
at Shutdown
, V
High (V
Low (V
High
Low
BOOST
BGATE
TGATE
TGATE
and switches to the normal PWM mode when V
at Shutdown
CC
and battery voltage differential is low, high duty factor
– V
– V
SW
SW
)
)
BOOST
CC
CC
– V
– V
drops below the comparator A2
INFET
INFET
)
)
CONDITIONS
Output Current from 50 A to 500 A
V
At 0.5mA VA Output Current, T
(3 CELL, 4.1V, 4.2V Are Not Connected, V
0.5mA Output Current
Output Current from 50 A to 500 A
0.5mA Output Current
0.5mA Output Current
V
V
V
V
Measured at V
Low to High Threshold
High to Low Threshold
V
V
V
11V < V
V
I
I
I
I
10nF Load
1nF Load
V
I
TGATE
BGATE
TGATE
BGATE
TGATE
FB
CC
INFET
CC
CC
SHDN
CAP
CAP
SHDN
SHDN
= V
Not Connected, I
Not Connected, (V
= 4V, I
= 0.6V
11V
= V
= I
= Low (Shutdown)
= Low (Shutdown)
= Low (Shutdown)
PROG
CC
20mA, V
20mA
50mA
50mA
BGATE
CC
A
< 24V, I
FLAG
= 25 C. V
= V
– 6V
BOOST
RS1
= 10 A
REF
< 1mA
BOOST
The
, V
GBIAS
is
+ 10mV
CAP
INFET
CC
CC
= V
= 2V (Note 7)
denotes specifications which apply over the full operating
– V
= 18V, V
< – 2 A
15mA
GBIAS
INFET
Note 6: See “Lithium-Ion Charging Completion” in the Applications
Information Section.
Note 7: Tested with Test Circuit 3.
Note 8: I
not present to avoid high surge current from C
inserted.
Note 9: Above undervoltage threshold switching is enabled.
Note 10: Do not connect V
will cause the internal diode between V
and may cause high current to flow from V
removed, V
A
< 70 C
– 0.5V
) 2V
BAT
SPIN
= 12.6V, V
BAT2
CC
keeps switching on to keep V
will be held up by the body diode of M1.
= 0V)
CLN
CC
= V
directly to V
CC
(LT1505), no load on any
0.21
MIN
– 10
1.1
0.5
6.5
0.6
8.4
5.6
6.2
87
14
8
BAT
IN
BAT
and V
IN
(see Figure 1). This connection
. When the adapter is
– 2.5
0.13
TYP
0.6
0.8
7.8
3.3
9.1
6.6
7.2
regulated when battery is
OUT
92
20
20
25
1
1
1
1
CC
when battery is
to be forward-biased
MAX
1.0
1.4
4.2
0.3
0.3
9.6
0.8
0.8
97
28
3
3
2
9
3
3
1
25
UNITS
1505fc
mho
mho
mA
mV
mA
mA
mA
mV
nA
ns
A
V
V
V
V
V
V
A
V
V
V
V
V
V
A
V