MAX17535ETG+ Maxim Integrated Products, MAX17535ETG+ Datasheet - Page 13

• Manufacturer Part Number: MAX17535ETG+
• Description: IC SMBUS BATT CHRGR HF 24TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX17535ETG+

• Function: Charge Management
• Battery Type: Multi-Chemistry
• Voltage - Supply: 8 V ~ 26 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TQFN Exposed Pad
• Product: Charge Management
• Operating Supply Voltage: 8 V to 26 V
• Supply Current: 1.5 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Charge Safety Timers: Yes
• Mounting Style: SMD/SMT
• Temperature Monitoring: Yes
• Uvlo Stop Threshold: 3.9 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIN
16
17
18
19
20
21
22
23
24
—
NAME
CSSP
ACIN
ITHR
GND
IINP
V
V
______________________________________________________________________________________
CC
EN
EP
CC
AA
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
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.
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
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
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
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.
4.096V Internal Reference Voltage; No External Load Allowed. Bypass to analog ground using a 1FF
or greater ceramic capacitor. V
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.
Analog Ground
Enable/Disable Charger Operation. This disables the charger and associated circuitry when 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, V
current monitor on IINP are enabled.
Exposed Pad. Connect backside EP to power ground.
Low-Cost SMBus Chargers
AA
is active only after LDO and the internal reference are active.
AA
, the input charge current, and the battery discharge
FUNCTION
Pin Description (continued)
High-Frequency,
13