MAX17435ETG+ Maxim Integrated Products, MAX17435ETG+ Datasheet - Page 18

• 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

The MAX17435/MAX17535 support four battery-charger
commands that use either write-word or read-word
protocols as summarized in Table 3. ManufacturerID()
and
MAX17435/MAX17535. On the MAX17435/MAX17535,
ManufacturerID() always returns 0x004D and DeviceID()
always returns 0x0008.
To set the output voltage, use the SMBus to write a
16-bit ChargeVoltage() command using the data format
listed in Table 4. The ChargeVoltage() command uses
the write-word and read-word protocols (see Figure
3). The command code for ChargeVoltage() is 0x15
(0b00010101).
a charge-voltage range of 4.095V to 19.200V, with
16mV resolution. Set ChargeVoltage() below 4.095V to
terminate charging. Upon reset, the ChargeVoltage()
and ChargeCurrent() values are cleared and the charger
remains off until both the ChargeVoltage() and the
ChargeCurrent() command are sent. Both DHI and DLO
remain low until the charger is restarted.
Table 3. Battery Charger Command Summary
High-Frequency,
Low-Cost SMBus Chargers
Note: ‘x’ means the data is sent to the analog block.
Figure 5. SMBus Read Timing
18
COMMAND
0x3D
_____________________________________________________________________________________
0x14
0x15
0x3E
0x3F
0xFE
0xFF
DeviceID()
SMBCLK
SMBDATA
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
COMMAND NAME
ManufacturerID()
ChargeVoltage()
The
ChargeCurrent()
Relearn Voltage
t
InputCurrent()
SU:STA
IINPVoltage()
can
DeviceID()
Battery Charger Commands
A
t
HD:STA
MAX17435/MAX17535
be
Setting Charge Voltage
t
LOW
B
used
t
HIGH
Read and write
Read and write
Read and write
Read and write
READ/WRITE
Read only
Read only
Read only
to
t
SU:DAT
C
identify
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
provide
D
6-bit charge-current setting, readback
(3’b0, 6’bx, 7’b0)
11-bit charge-voltage setting, readback
(1’b0, 11’bx, 4’b0)
11-bit relearn voltage set and 1-bit enable/status
Digital readback of IINP voltage
6-bit input-current setting readback
(3’b0, 6’bx, 7’b0)
Manufacturer ID
Device ID
the
E
F
To set the charge current, use the SMBus to write a 16-bit
ChargeCurrent() command using the data format listed in
Table 5. The ChargeCurrent() command uses the write-word
and read-word protocols (see Figure 3). The command
code for ChargeCurrent() is 0x14 (0b00010100). When
RS2 = 10mI, the MAX17435/MAX17535 provide a charge-
current range of 128mA to 8.064A, with 128mA resolution.
If a sense resistor other than 10mI is used, the current
limit must be scaled by RS/10mI, where RS is the sense
resistor value used on the circuit. Set ChargeCurrent() to
0 to terminate charging. Upon reset, the ChargeVoltage()
and ChargeCurrent() values are cleared and the charger
remains off until both the ChargeVoltage() and the
ChargeCurrent() command are sent. Both DHI and DLO
remain low until the charger is restarted.
The MAX17435/MAX17535 include a fault limiter for
low-battery conditions. If the battery voltage is less than
3V, the charge current is temporarily set to 128mA. The
ChargeCurrent() register is preserved and becomes
active again when the battery voltage is higher than 3V.
This function effectively provides a foldback current limit
that protects the charger during short circuit and overload.
t
HD:DAT
G
DESCRIPTION
t
SU:DAT
I = ACKNOWLEDGE CLOCK PULSE
J = STOP CONDITION
K = NEW START CONDITION
H
Setting Charge Current
I
t
SU:STO
J
t
BUF
K
POR STATE
0x4B00
0x004D
0x0000
0x0000
0x1000
0x0008
NA