MAX17435ETG+ Maxim Integrated Products, MAX17435ETG+ Datasheet - Page 16

• Manufacturer Part Number: MAX17435ETG+
• Description: IC SMBUS BATT CHARGER 24TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX17435ETG+

• 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: 7 V to 26 V
• Supply Current: 1.5 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Charge Safety Timers: Yes
• Temperature Monitoring: Yes
• Uvlo Stop Threshold: 3.9 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Frequency,
Low-Cost SMBus Chargers
Table 1. EN Pin Function
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.
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.
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:
where I
adapter and A is the gain (20V/V typ). V
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.
16
ADAPTER
PRESENT
_____________________________________________________________________________________
Yes
Yes
No
No
INPUT
Analog Input Current Monitor Output
is the DC current supplied by the AC
High
High
Low
Low
I
EN
INPUT
=
PDSL is pumped 8V above the DCIN
PDSL is pumped 8V above the DCIN
RS1
V
Charge pump is off and PDSL is
Charge pump is off and PDSL is
IINP
voltage (charge pump on).
voltage (charge pump on).
×
forced to 0V (typ, 27C).
forced to 0V (typ, 27C).
A
PDSL STATUS
IINP
30mA LDO
has a 0V to
EN Pin
Table 2. Fault Protection and Shutdown
Operation Table
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.
by adapter reinsertion)
Thermal fault (latched,
than 3 ACOCP faults
More than 3 ACOCP
faults (latched, reset
ACOV fault or less
CHARGER STATUS
reset by adapter
Battery OV fault
(not latched)
(not latched)
reinsertion)
MODE
Disabled
Disabled
Disabled
Enabled
Charger disabled,
Charger disabled,
Charger disabled,
Charger disabled,
PDSL high, LDO,
PDSL low, LDO,
PDSL low, LDO,
PDSL low, LDO,
CONTROLLER
and V
and V
SYSTEM CURRENT MONITOR
SMBus Implementation
and V
and V
STATE
STATUS (IINP PATH)
AA
AA
AA
AA
active
active
off
off
Disabled
Enabled
Enabled
Enabled
DLO low
DLO low
DLO low
DLO low
DRIVER
DHI and
DHI and
DHI and
DHI and
STATE