MAX1554ETA-T Maxim Integrated Products, MAX1554ETA-T Datasheet - Page 6

• Manufacturer Part Number: MAX1554ETA-T
• Description: LED Drivers High Efficiency 40V Step-Up Converter fo
• Manufacturer: Maxim Integrated Products

Specifications of MAX1554ETA-T

• Number Of Segments: 10
• Operating Supply Voltage: 3.15 V to 5.5 V
• Maximum Power Dissipation: 1951 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TDFN EP
• Minimum Operating Temperature: - 40 C

The MAX1551/MAX1555 feature a precharge current to
protect deeply discharged cells. If V
the device enters precharge mode where charging cur-
rent is limited to 40mA.
On-chip thermal limiting in the MAX1551/MAX1555 sim-
plifies PC board layout and allows charging rates to be
optimized without the limits imposed by worst-case bat-
tery and input voltages. The device reduces the power
dissipation at BAT to prevent overheating. This allows
the board design to be optimized for compact size and
typical thermal conditions. When the MAX1551/
MAX1555 thermal limits are reached, the chargers do
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
6
_______________________________________________________________________________________
Package Thermal Limiting
AC ADAPTER
3.7V TO 6V
3.7V TO 7V
USB
1µF
1µF
Precharge Current
C1
C2
BAT
DC
USB
is less than 3V,
(MAX1555)
MAX1551
CONTROL
CHARGE
CONTROL
LOGIC
not shut down, but progressively reduce charging cur-
rent by 17mA/°C above a die temperature of +110°C.
Solder the MAX1551/MAX1555s’ GND to a large
ground plane to help dissipate power and keep the die
temperature below the thermal limit. The USB charge
current of 100mA is unlikely to induce thermal limiting.
Use ceramic bypass capacitors at DC, USB, and BAT.
Mount these capacitors within 1cm of their respective
pins. X7R and X5R dielectrics are recommended.
TRANSISTOR COUNT: 541
PROCESS: BiCMOS
GND
(CHG)
POK
BAT
Typical Application Circuit
C3
1µF
R1
100kΩ
Li+
INDICATES
THAT POWER
IS PRESENT
(EITHER DC
OR USB)
TO LOGIC RAIL
TO SYSTEM
LOAD
Chip Information
Bypass Capacitors