MAX17435 查看數據表（PDF） - Maxim Integrated

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MAX17435

High-Frequency, Low-Cost SMBus Chargers

Maxim Integrated 

High-Frequency,

Low-Cost SMBus Chargers

Pin Description (continued)

PIN

NAME

FUNCTION

Current Sense for Positive Input. Connect a current-sense resistor from CSSP to CSSN. The voltage

across CSSP to CSSN determines the current at which the charger reduces charging current to

keep from drawing more current from the adapter than is allowed. As the system current flowing in

the resistor from CSSN to CSSP increases, the charger reduces charge current to keep the system

16

CSSP

current at the limit value. When the system current reaches 130% of InputCurrent() setting for more

than 16ms, the PDSL pin turns off the adapter selector FET to prevent excess current from being

drawn from the adapter. The adaptor selector FET is re-enabled after 0.6s. If the fault continues, the

cycle is repeated three times after which the MAX17435/MAX17535 is latched off. To reset the latch,

remove and reinsert the adapter.

17

CC

Voltage Regulation Loop-Compensation Point. Connect a 10nF capacitor from CC to GND.

Input Current-Monitor Output. The voltage at the IINP pin is 20 times the voltage from CSSP to

18

IINP

CSSN. This voltage is present when charging is enabled to monitor the system current, and when

the battery is discharging to monitor the battery discharge current.

AC Adapter-Detect Input. ACIN is the input to a comparator with a 1.485V (typ) reference voltage.

The output of the comparator is ACOK. ACOK goes low when the threshold voltage is exceeded,

indicating that the AC adapter is present, and it enables the charger. When the ACIN input is above

19

ACIN

2.0V, the MAX17435/MAX17535 interpret that as an adapter overvoltage event. The charger is then

disabled and the adapter MOSFETs are turned off. If the part is charging and the ACIN voltage

drops below the programmed threshold, the charger is disabled, and a ChargeCurrent() and

ChargeVoltage() command have to be written over the SMBus to re-enable the charger.

Adaptive System Current-Limit Comparator Threshold. This pin connects to the inverting input of a

20

ITHR

comparator. The noninverting input of the comparator is the IINP input, while the output is driving

the ADAPTLIM open drain. When the input to ITHR is greater than IINP, the ADAPTLIM output is

high.

21

VAA

4.096V Internal Reference Voltage; No External Load Allowed. Bypass to analog ground using a 1FF

or greater ceramic capacitor. VAA is active only after LDO and the internal reference are active.

22

VCC

Circuitry Supply-Voltage Input. Connect to LDO through 10I and bypass with a 0.1FF capacitor to

GND as close as possible to the package pin.

23

GND

Analog Ground

Enable/Disable Charger Operation. This disables the charger and associated circuitry when EN

24

EN

goes low and is in addition to the ACOK charger enable. If the adapter is absent and EN is pulled

up to a voltage higher than 2.4V, LDO, VAA, the input charge current, and the battery discharge

current monitor on IINP are enabled.

—

EP

Exposed Pad. Connect backside EP to power ground.

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