LT1510CS8 Linear Technology, LT1510CS8 Datasheet - Page 6

• Manufacturer Part Number: LT1510CS8
• Description: IC BATT CHARGER CONST V/I 8SOIC
• Manufacturer: Linear Technology

Specifications of LT1510CS8

• Function: Charge Management
• Battery Type: Li-Ion, NiCd, NiMH
• Voltage - Supply: 6.2 V ~ 28 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TYPICAL PERFORMANCE CHARACTERISTICS
GND: Ground Pin.
SW: Switch Output. The Schottky catch diode must be
placed with very short lead length in close proximity to SW
pin and GND.
V
capacitor of 10 F or higher is required, with the lead length
kept to a minimum. V
and at least 2V higher than V
2.5V higher than V
voltage lockout starts and switching stops when V
below 7V. Note that there is a parasitic diode inside from
SW pin to V
than 0.7V with battery present. All V
shorted together close to the pins.
BOOST: This pin is used to bootstrap and drive the switch
power NPN transistor to a low on-voltage for low power
dissipation. In normal operation, V
when switch is on. Maximum allowable V
SENSE: Current Amplifier CA1 Input. Sensing can be at
either terminal of the battery. Note that current sense
resistor R
PIN
LT1510/LT1510-5
6
CC
U
: Supply for the Chip. For good bypass, a low ESR
50
45
40
35
30
25
20
15
10
5
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
Switch Current vs Boost Current
vs Boost Voltage
FUNCTIONS
V
CC
S1
= 16V
U
CC
(0.08 ) is between Sense and BAT pins.
SWITCH CURRENT (A)
pin. Do not force V
BAT
V
BOOST
U
CC
for V
should be between 8V and 28V
= 38V
28V
18V
BAT
W
BAT
1.6
for V
greater than 10V. Under-
1.8 2.0
1510 G07
U
CC
BAT
BOOST
below SW by more
CC
less than 10V, and
pins should be
BOOST
= V
2.470
2.468
2.466
2.464
2.462
2.460
2.458
CC
is 55V.
Reference Voltage vs
Temperature
0
CC
+ V
goes
25
BAT
TEMPERATURE ( C)
50
BAT: Current Amplifier CA1 Input.
PROG: This pin is for programming the charging current
and for system loop compensation. During normal opera-
tion, V
the switching will stop. When a microprocessor-controlled
DAC is used to program charging current, it must be
capable of sinking current at a compliance up to 2.465V.
V
mode PWM. Switching starts at 0.7V and higher V
corresponds to higher charging current in normal opera-
tion. A capacitor of at least 0.1 F to GND filters out noise
and controls the rate of soft start. To shut down switching,
pull this pin low. Typical output current is 30 A.
OVP: This is the input to the amplifier VA with a threshold
of 2.465V. Typical input current is about 50nA into pin. For
charging lithium-ion batteries, VA monitors the battery
voltage and reduces charging current when battery volt-
age reaches the preset value. If it is not used, the OVP pin
should be grounded.
C
75
: This is the control signal of the inner loop of the current
100
PROG
125
stays close to 2.465V. If it is shorted to GND
1510 G14
150
96
95
94
93
92
91
90
89
88
87
86
2
V
Maximum Duty Cycle
BOOST
4
6
vs
8
10 12 14
V
BOOST
(V)
16 18 20
LT1510 • TPC15
22
C