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1510

Constant-Voltage/Constant-Current Battery Charger

Linear Technology 

LT1510/LT1510-5

TYPICAL PERFORMANCE CHARACTERISTICS

Switch Current vs Boost Current

vs Boost Voltage

50

45 VCC = 16V

40

VBOOST = 38V

28V

35

18V

30

25

20

15

10

5

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

SWITCH CURRENT (A)

1510 G07

Reference Voltage vs

Temperature

2.470

2.468

2.466

2.464

2.462

2.460

2.458

0

25 50 75 100 125 150

TEMPERATURE (°C)

1510 G14

VBOOST vs

Maximum Duty Cycle

96

95

94

93

92

91

90

89

88

87

86

2 4 6 8 10 12 14 16 18 20 22

VBOOST (V)

LT1510 • TPC15

PIN FUNCTIONS

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.

VCC: Supply for the Chip. For good bypass, a low ESR

capacitor of 10µF or higher is required, with the lead length

kept to a minimum. VCC should be between 8V and 28V

and at least 2V higher than VBAT for VBAT less than 10V, and

2.5V higher than VBAT for VBAT greater than 10V. Under-

voltage lockout starts and switching stops when VCC goes

below 7V. Note that there is a parasitic diode inside from

SW pin to VCC pin. Do not force VCC below SW by more

than 0.7V with battery present. All VCC pins should be

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, VBOOST = VCC + VBAT

when switch is on. Maximum allowable VBOOST is 55V.

SENSE: Current Amplifier CA1 Input. Sensing can be at

either terminal of the battery. Note that current sense

resistor RS1 (0.08Ω) is between Sense and BAT pins.

BAT: Current Amplifier CA1 Input.

PROG: This pin is for programming the charging current

and for system loop compensation. During normal opera-

tion, VPROG stays close to 2.465V. If it is shorted to GND

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.

VC: This is the control signal of the inner loop of the current

mode PWM. Switching starts at 0.7V and higher VC

corresponds to higher charging current in normal opera-

tion. A capacitor of at least 0.1µF to GND filters out noise

and controls the rate of soft start. To shut down switching,

pull this pin low. Typical output current is 30µA.

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.

6

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