Datasheet
2
LT1505
1505fc
V
CC
, CLP, CLN, INFET, UV, 3CELL, FLAG................ 27V
SW Voltage with Respect to GND ........................... –2V
BOOST, BOOSTC Voltage with Respect to V
CC
....... 10V
GBIAS ..................................................................... 10V
SYNC, BAT2, BAT, SENSE, SPIN ............................ 20V
V
C
, PROG, V
FB
, 4.1V, 4.2V........................................ 7V
CAP, SHDN .......................................................... ±3mA
ABSOLUTE MAXIMUM RATINGS
W
WW
U
(Note 1)
TGATE, BGATE Current Continuous ....................... 0.2A
TGATE, BGATE Output Energy (per cycle) ............... 2µJ
Maximum Operating V
CC
......................................... 24V
Operating Ambient Temperature Range....... 0°C to 70°C
Operating Junction Temperature Range .... 0°C to 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
ORDER PART
NUMBER
LT1505CG
LT1505CG-1
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 100°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
BOOST
TGATE
SW
SYNC
SHDN
AGND
UV
INFET
CLP
CLN
COMP1
CAP
FLAG
4.1V
PGND
BGATE
GBIAS
BOOSTC
V
CC
BAT
SPIN
SENSE
BAT2
PROG
V
C
V
FB
3CELL
4.2V
T
JMAX
= 125°C, θ
JA
= 100°C/W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
BOOST
TGATE
SW
SYNC
SHDN
AGND
UV
INFET
NC
NC
GND
CAP
FLAG
4.1V
PGND
BGATE
GBIAS
BOOSTC
V
CC
BAT
SPIN
SENSE
BAT2
PROG
V
C
V
FB
3CELL
4.2V
NOTE: LT1505CG-1 DOES NOT
HAVE INPUT CURRENT
LIMITING FUNCTION.
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER INFORMATION
W
U
U
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 18V, V
BAT
= 12.6V, V
CLN
= V
CC
(LT1505), no load on any
outputs unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Overall
Supply Current V
CC
≤ 24V ● 12 15 mA
Sense Amplifier CA1 Gain and Input Offset Voltage 11V ≤ V
CC
≤ 24V , 0V ≤ V
BAT
≤ 20V
(With R
S2
= 200Ω, R
S3
= 200Ω)R
PROG
= 4.93k 95 100 105 mV
(Measured across R
S1
, Figure 1) (Note 2) R
PROG
= 4.93k ● 92 108 mV
R
PROG
= 49.3k 7 10 13 mV
BOOST Pin Current V
BOOST
= V
SW
+ 8V, 0V ≤ V
SW
≤ 20V
TGATE High 2 3 mA
TGATE Low 2 3 mA
BOOSTC Pin Current V
BOOSTC
= V
CC
+ 8V 1 mA
Reference
Reference Voltage (Note 3) R
PROG
= 4.93k, Measured at V
FB
with V
A
2.453 2.465 2.477 V
Supplying I
PROG
and Switching Off
Reference Voltage Tolerance 11V ≤ V
CC
≤ 24V ● 2.441 2.489 V