MAX17435 查看數據表（PDF） - Maxim Integrated
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MAX17435 Datasheet PDF : 27 Pages
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High-Frequency,
Low-Cost SMBus Chargers
Table 1. EN Pin Function
ADAPTER
PRESENT
EN
PDSL STATUS
Yes
High
PDSL is pumped 8V above the DCIN
voltage (charge pump on).
Yes
Low
PDSL is pumped 8V above the DCIN
voltage (charge pump on).
No
High
Charge pump is off and PDSL is
forced to 0V (typ, 27C).
No
Low
Charge pump is off and PDSL is
forced to 0V (typ, 27C).
CHARGER STATUS
Enabled
SYSTEM CURRENT MONITOR
STATUS (IINP PATH)
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Disabled
EN Pin
The EN pin is a logic input. The state of the EN pin and
the presence or absence of the adapter determines the
state of PDSL, the IINP path, and the charger function as
shown in Table 1.
30mA LDO
The 5.4V LDO is powered from DCIN and is compensated
for loads from 0 to 30mA with a single 1FF ceramic
capacitor. The load regulation over the 30mA load is
34mV (typ), 100mV max. The LDO supplies the drive for
the DLO driver and also the BST circuitry. It is shut down
when the adapter is absent.
Analog Input Current Monitor Output
IINP monitors the system-input current sensed across the
sense resistor (RS1) that connects between CSSP and
CSSN. The voltage at IINP is proportional to the input
current according to the following equation:
IINPUT
=
VIINP
RS1 × A
where IINPUT is the DC current supplied by the AC
adapter and A is the gain (20V/V typ). VIINP has a 0V to
2.2V output voltage range.
Table 1 shows the charge and IINP status when the
adapter is present or absent and as a function of the
EN pin. When connected as shown in the standard
application circuit, IINP monitors the input system
current when the adapter is present or the battery
discharge current when the adapter is absent. Leave
IINP unconnected if not used.
Table 2 is the fault protection and shutdown operation
table.
Table 2. Fault Protection and Shutdown
Operation Table
MODE
CONTROLLER
STATE
DRIVER
STATE
Thermal fault (latched,
reset by adapter
reinsertion)
Charger disabled,
PDSL low, LDO,
and VAA off
DHI and
DLO low
ACOV fault or less
than 3 ACOCP faults
(not latched)
Charger disabled,
PDSL low, LDO,
and VAA active
DHI and
DLO low
More than 3 ACOCP
faults (latched, reset
by adapter reinsertion)
Charger disabled,
PDSL low, LDO,
and VAA off
DHI and
DLO low
Battery OV fault
(not latched)
Charger disabled,
PDSL high, LDO,
and VAA active
DHI and
DLO low
SMBus Implementation
The MAX17435/MAX17535 receive control inputs from
the SMBus interface. The MAX17435/MAX17535 use
a subset of the commands documented in the System
Management Bus Specifications V1.1, which can be
downloaded from www.smbus.org. The MAX17435/
MAX17535 use the SMBus read-word and write-word
protocols to communicate with the system controller. The
MAX17435/MAX17535 operate only as slave devices
with address 0b0001001_ (0x12) and do not initiate
communication on the bus. In addition, the MAX17435/
MAX17535 have two identification registers: (0xFF), a
16-bit device ID register and a 16-bit manufacturer ID
register (0xFE). The SMBus implementation is similar to
the MAX8731A with the addition of the RELEARN() and
IINPVoltage() commands. The SMBus is not powered
from an external supply, so during states that disable the
charger, the SMBus register data is lost, so the register
data must be rewritten when reenabled. See Figure 3.
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