MAX1507ETA+T Maxim Integrated Products, MAX1507ETA+T Datasheet - Page 8

• Manufacturer Part Number: MAX1507ETA+T
• Description: IC BATT CHARGER LI-ION 8-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1507ETA+T

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.25 V ~ 13 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-WDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CHG is an open-drain current source for indicating
charge status. Table 1 describes the state of CHG dur-
ing different stages of operation.
CHG is a nominal 12mA current source suitable for dri-
ving a charge-indication LED. If the MAX1507 is used
in conjunction with a microprocessor, a pullup resistor
to the logic I/O voltage allows CHG to indicate charge
status to the µP instead of driving an LED.
An analog soft-start algorithm activates when entering
fast-charge mode. When the prequalification state is
complete (V
ramps up in 3ms to the full charging current. This
reduces the inrush current on the input supply.
The maximum charging current is programmed by an
external R
Select the R
where I
also be used to monitor the fast-charge current level.
The output current from the ISET pin is 0.958mA per
amp of charging current. The output voltage at ISET is
proportional to the charging current as follows:
The voltage at ISET is nominally 1.4V at the selected
fast-charge current, and falls with charging current as
the cell becomes fully charged.
Set the regulated die temperature of the MAX1507 with
the TEMP three-level logic input. The MAX1507
reduces the charge current to limit the die temperature
Linear Li+ Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFN
Table 1. CHG States
X = Don’t care.
*I
8
FAST
High
_______________________________________________________________________________________
Low
Low
Low
Low
EN
X
is reduced as necessary to maintain the die temperature set by the TEMP input.
FAST
ISET
BATT
ISET
is in amps and R
V
ISET
4.25V ≤ V
4.25V ≤ V
4.25V ≤ V
Applications Information
resistor connected from ISET to GND.
I
value based on the following formula:
FAST
Thermal-Regulation Selection
CHG Charge Indicator Output
exceeds +2.5V), the charging current
= (I
V
>7V
V
BATT
= 1461V / R
X
IN
CHG
Charge-Current Selection
IN
IN
IN
≤ 7V
≤ 7V
≤ 7V
x R
ISET
ISET
ISET
is in ohms. ISET can
) / 1044
Ω
V
< 2.5V
≥ 2.5V
4.2V
BATT
V
X
X
IN
Soft-Start
10% of I
10% of I
I
I
FAST
BATT
0
0
0
FAST
FAST
to the value set by TEMP. The MAX1507 operates nor-
mally while the thermal loop is active. An active thermal
loop does not indicate a fault condition. TEMP allows
the MAX1507 to maximize the charge current while pro-
viding protection against excessive power dissipation.
Connect TEMP to GND to regulate the die temperature
at +90°C. Leave TEMP floating to regulate the die tem-
perature at +100°C. Connect TEMP to VL to regulate
the die temperature at +130°C.
Connect a ceramic capacitor from BATT to GND for
proper stability. Use a 1µF X5R ceramic capacitor for
most applications.
Connect a 1µF ceramic capacitor from IN to GND. Use
a larger input bypass capacitor for high input voltages
or high charging currents to reduce supply noise.
Connect a 0.47µF ceramic capacitor from VL to GND.
The MAX1507 is in a thermally enhanced thin DFN
package with exposed paddle. Connect the exposed
paddle of the MAX1507 to a large copper ground plane
to provide a thermal contact between the device and
the circuit board. The exposed paddle transfers heat
away from the device, allowing the MAX1507 to charge
the battery with maximum current, while minimizing the
increase in die temperature.
The MAX1507 operates from well-regulated DC
sources. The full-charging input-voltage range is 4.25V
to 7V. The device can stand up to 13V on the input
without damage to the IC. If V
the MAX1507 stops charging.
An appropriate power supply must provide at least
4.25V when sourcing the desired peak charging cur-
rent. It also must stay below 6.5V when unloaded.
*
CHG
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Low
Low
Thermal Considerations
Shutdown
Prequalification
Fast Charge
Full Charge
Overvoltage
Disabled
IN
Capacitor Selection
is greater than 7V, then
DC Input Sources
STATE