LTC1960 データシートの表示（PDF） - Linear Technology

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LTC1960

Dual Battery Charger/Selector with SPI Interface

Linear Technology 

LTC1960

PIN FUNCTIONS (G/UHF)

Input Power Related

SCN (Pin 4/Pin 30): PowerPath Current Sensing Negative

Input. This pin should be connected directly to the “bottom”

(output side) of the sense resistor, RSC, in series with the

three PowerPath switch pairs, for detecting short-circuit

current events. Also powers LTC1960 internal circuitry

when all other sources are absent.

SCP (Pin 5/Pin 31): PowerPath Current Sensing Positive

Input. This pin should be connected directly to the “top”

(switch side) of the sense resistor, RSC, in series with the

three PowerPath switch pairs, for detecting short-circuit

current events.

GDCO (Pin 6/Pin 32): DCIN Output Switch Gate Drive.

Together with GDCI, this pin drives the gate of the P-channel

switch in series with the DCIN input switch.

GDCI (Pin 7/Pin 33): DCIN Input Switch Gate Drive.

Together with GDCO, this pin drives the gate of the

P-channel switch connected to the DCIN input.

GB1O (Pin 8/Pin 34): BAT1 Output Switch Gate Drive.

Together with GB1I, this pin drives the gate of the P-channel

switch in series with the BAT1 input switch.

GB1I (Pin 9/Pin 35): BAT1 Input Switch Gate Drive.

Together with GB1O, this pin drives the gate of the P-channel

switch connected to the BAT1 input.

GB2O (Pin 10/Pin 36): BAT2 Output Switch Gate Drive.

Together with GB2I, this pin drives the gate of the P-channel

switch in series with the BAT2 input switch.

GB2I (Pin 11/Pin 37): BAT2 Input Switch Gate Drive.

Together with GB2O, this pin drives the gate of the P-channel

switch connected to the BAT2 input.

CLP (Pin 24/Pin 13): The Positive Input to the Supply

Current Limiting Amplifier CL1. The threshold is set at

100mV above the voltage at the DCIN pin. When used

to limit supply current, a filter is needed to filter out the

switching noise.

Battery Charging Related

VSET (Pin 13/Pin 1): The Tap Point of a Programmable

Resistor Divider Which Provides Battery Voltage Feedback

to the Charger. A capacitor from CSN to VSET and from

VSET to GND provide necessary compensation and filtering

for the voltage loop.

ITH (Pin 14/Pin 2): The Control Signal of the Inner Loop of

the Current Mode PWM. Higher ITH voltage corresponds to

higher charging current in normal operation. A capacitor

of at least 0.1µF to GND filters out PWM ripple. Typical

full-scale output current is 30µA. Nominal voltage range

for this pin is 0V to 2.4V.

ISET (Pin 15/Pin 3): A capacitor from ISET to ground is

required to filter higher frequency components from the

delta-sigma IDAC.

CSN (Pin 22/Pin 11): Current Amplifier CA1 Input. Con-

nect this to the common output of the charger MUX

switches.

CSP (Pin 23/Pin 12): Current Amplifier CA1 Input. This

pin and the CSN pin measure the voltage across the

sense resistor, RSNS, to provide the instantaneous cur-

rent signals required for both peak and average current

mode operation.

COMP1 (Pin 25/Pin 14): The Compensation Node for the

Amplifier CL1. A capacitor is required from this pin to GND

if input current amplifier CL1 is used. At input adapter

current limit, this node rises to 1V. By forcing COMP1 low,

amplifier CL1 will be defeated (no adapter current limit).

COMP1 can source 10µA.

BGATE (Pin 27/Pin 16): Drives the bottom external MOSFET

of the battery charger buck converter.

SW (Pin 30/Pin 19): PWM switch node connected to source

of the top external MOSFET switch. Used as reference for

top gate driver.

BOOST (Pin 31/Pin 20): Supply to Topside Floating Driver.

The bootstrap capacitor is returned to this pin. Voltage

swing at this pin is from a diode drop below VCC to (DCIN

+ VCC).

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