LTC4101 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC4101

Smart Battery Charger Controller

Linear Technology 

LTC4101

OPERATION

The ILIM Decoder Block

The value of an external resistor connected from this pin

to GND determines one of four current limits that are used

for maximum charging current value. These limits provide

a measure of safety with a hardware restriction on charging

current which cannot be overridden by software.

Table 6. ILIM Trip Points and Ranges

EXTERNAL

RESISTOR

(RILIM)

ILIM VOLTAGE

CONTROLLED

CHARGING

CURRENT RANGE

GRANULARITY

Short to GND VILIM < 0.09VDD 0 < I < 1023mA

1mA

10k ±1%

33k ±1%

0.17VVDD < VILIM 0 < I < 2046mA

2mA

< 0.34VVDD

0.42VVDD < VILIM 0 < I < 3068mA

4mA

< 0.59V

Open (>250k, 0.66VVDD < VILIM 0 < I < 4092mA

4mA

or Short to VDD)

The VLIM Decoder Block

The value of an external resistor connected from this pin

to GND determines one of five voltage limits that are ap-

plied to the charger output value. These limits provide a

measure of safety with a hardware restriction on charging

voltage which cannot be overridden by software.

Table 7. VLIM Trip Points and Ranges (See Figure 5)

EXTERNAL

RESISTOR

(RILIM)

ILIM VOLTAGE

CONTROLLED

CHARGING

CURRENT RANGE GRANULARITY

Short to

GND

VVLIM < 0.09VVCCP 2900mV < VOUT

< 4240mV

16mV

10k ±1%

33k ±1%

100k ±1%

Open or

Tied to VDD

0.17VVDD < VVLIM

< 0.34VVDD

0.42VVCCP < VVLIM

< 0.59VVDD

0.66VVDD < VVLIM

< 0.84VVDD

0.91VVDD < VVLIM

2900mV < VOUT

< 4304mV

2900mV < VOUT

< 4432mV

2900mV < VOUT

< 4512mV

2900mV < VOUT

< 5504mV

16mV

16mV

16mV

16mV

VDD

AC_PRESENT

12.5k

+

33k

25k

–

+

4

VLIM 14

25k

–

VLIM [3:0]

ENCODER

+

RVLIM

25k

–

+

12.5k

–

4101 F05

Figure 5. Simplified VLIM Circuit Concept (ILIM is Similar)

4101fa

19

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