LTC3331 datasheet(13/34 Pages) LINER

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LTC3331

3331fc

For more information www.linear.com/LTC3331

Supercapacitor Balancer

Quiescent Current vs VSCAP

Supercapacitor Balancer

Source/Sink Current

Battery Connect Transient

Battery Connect/Disconnect

vs Temperature

Battery Connect/Disconnect

vs Temperature

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.

TEMPERATURE (°C)

–50

2.6

2.8

3.2

3.4

3.6

4.4

3331 G58

3.0

–25

100

125

3.8

4.0

4.2

CONNECT, BAT_OUT

CONNECT, BAT_IN

DISCONNECT, BAT_OUT, BAT_IN

4.0, 4.1, 4.2 FLOAT

LBSEL = 0

IBAT_OUT = 1mA

TEMPERATURE (°C)

–50

2.6

2.8

3.2

3.4

3.6

4.4

3331 G59

3.0

–25

100

125

3.8

4.0

4.2

CONNECT, BAT_OUT

CONNECT, BAT_IN

DISCONNECT, BAT_OUT, BAT_IN

4.0, 4.1, 4.2 FLOAT

LBSEL = 1

IBAT_OUT = 1mA

500ms/DIV

3331 G60

CBAT_IN = 1mF

CBB_IN = 22µF, BB_IN TIED TO BAT_OUT

1mA LOAD AT VOUT

FLOAT[1:0] = 11, LBSEL = 0

500mV/DIV

BAT_OUT

BAT_IN

VOUT

BATTERY

DISCONNECTED

VSCAP (V)

250

200

150

100

4.5

3.5

3330 G61

5.5

2.5

85°C

125°C

25°C

–40°C

VBAL/VSCAP (%)

–10

–20

20 30

50 60 70 80 90

3330 G62

100

SCAP = 5V

SCAP = 2.5V

PIN FUNCTIONS

BAL (Pin 1): Supercapacitor Balance Point. The common

node of a stack of two supercapacitors is connected to

BAL. A source/sink balancing current of up to 10mA is

available. Tie BAL along with SCAP to GND to disable the

balancer and its associated quiescent current.

SCAP (Pin 2): Supply and Input for Supercapacitor

Balancer. Tie the top of a 2-capacitor stack to SCAP and

the middle of the stack to BAL to activate balancing. Tie

SCAP along with BAL to GND to disable the balancer and

its associated quiescent current.

VIN2 (Pin 3): Internal Low Voltage Rail to Serve as Gate

Drive for Buck NMOS Switch. Connect a 4.7µF (or larger)

capacitor from VIN2 to GND. This pin is not intended for

use as an external system rail.

UV3, UV2, UV1, UV0 (Pins 4, 5, 6, 7): UVLO Select Bits

for the Buck Switching Regulator. Tie high to VIN2orlowto

GNDtoselectthedesiredUVLOrisingandfallingthresholds

(see Table 4). The UVLO falling threshold must be greater

than the selected VOUT regulation level. Do not float.

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