MAX1507 Maxim Integrated Products, MAX1507 Datasheet - Page 7

• Manufacturer Part Number: MAX1507
• Description: Linear Li Battery Charger
• Manufacturer: Maxim Integrated Products

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maintain the battery at full charge. If, at any point while
charging the battery, the die temperature approaches
the user-selected temperature setting (TEMP pin), the
MAX1507 reduces the charging current so the die tem-
perature does not exceed the temperature-regulation
set point.
The thermal-regulation loop limits the MAX1507 die
temperature to the value selected by the TEMP input by
reducing the charge current as necessary (see the
Thermal-Regulation Selection section). This feature not
only protects the MAX1507 from overheating, but also
allows higher charge current without risking damage to
the system.
Figure 2. Charge State Diagram
Linear Li+Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFN
I
CHARGE
OF ISET
> 20%
_______________________________________________________________________________________
V
BATT
< 2.4V
100% CHARGER CURRENT
10% CHARGE CURRENT
V
PRECHARGE
FAST CHARGE
BATT
LED = ON
LED = ON
FULL BATT
LED = OFF
< 2.5V
V
BATT
> 2.5V
FULL BATT CONTINUES
TO REGULATE BATT
I
CHARGE
UP TO 4.2V
OF ISET
EN is a logic input (active low) to enable the charger.
Drive EN low, leave floating, or connect to GND to
enable the charger control circuitry. Drive EN high to
disable the charger control circuitry. EN has a 200kΩ
internal pulldown resistance.
The MAX1507 linear charger contains an internal linear
regulator available on the VL output pin. VL requires a
0.47µF ceramic bypass capacitor to GND. VL is regulat-
ed to 3.3V whenever the input voltage is above 3.5V.
< 10%
CHARGER = OFF
SHUTDOWN
LED = OFF
VL Internal Voltage Regulator
EN Charger Enable Input
V
V
EN = HIGH
IN
BATT
> 7V +
> V
ASYNCHRONOUS FROM
IN
+
V
BATT
ANYWHERE
EN = HIGH
V
IN
> 7V +
> VIN +
7
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