MAX17005B Datasheet, PDF (1/21 Pages) Maxim Integrated Products – 1.2MHz, Low-Cost, High-Performance Chargers

19-4576; Rev 0; 4/09
EVAALVUAAILTAIOBNLEKIT
1.2MHz, Low-Cost,
High-Performance Chargers
General Description
The MAX17005B/MAX17006B/MAX17015B are high-fre-
quency multichemistry battery chargers. These circuits
feature a new high-frequency current-mode architecture
that significantly reduces component size and cost*.
The charger uses a high-side MOSFET with n-channel
synchronous rectifier. Widely adjustable charge current,
charge voltage, and input current limit simplify the con-
struction of highly accurate and efficient chargers.
The charge voltage and charge current are set with
analog control inputs. The charge current setting can
also be adjusted with a PWM input. High-accuracy cur-
rent-sense amplifiers provide fast cycle-by-cycle cur-
rent-mode control to protect against short circuits to the
battery and respond quickly to system load transients.
In addition, the charger provides a high-accuracy ana-
log output that is proportional to the adapter current. In
the MAX17015B, this current monitor remains active
when the adapter is absent to monitor battery dis-
charge current.
The MAX17005B charges three or four Li+ series cells,
and the MAX17006B charges two or three Li+ series
cells. The MAX17015B adjusts the charge voltage set-
ting and the number of cells through a feedback resis-
tor-divider from the output. All variants of the charger
can provide at least 4A of charge current with a 10mΩ
sense resistor.
The charger utilizes a charge pump to control an n-channel
adapter selection switch. The charge pump remains
active even when the charger is off. When the adapter
is absent, a p-channel MOSFET selects the battery.
The MAX17005B/MAX17006B/MAX17015B are avail-
able in a small, 4mm x 4mm x 0.8mm 20-pin, lead-free
TQFN package. An evaluation kit is available to reduce
design time.
Applications
Notebook Computers
Tablet PCs
Portable Equipment with Rechargeable Batteries
Features
o High Switching Frequency (1.2MHz)
o Controlled Inductor Current-Ripple Architecture
Reduced BOM Cost
Small Inductor and Output Capacitors
o ±0.4% Accurate Charge Voltage
o ±2.5% Accurate Input-Current Limiting
o ±3% Accurate Charge Current
o Single-Point Compensation
o Monitor Outputs for
±2.5% Accurate Input Current Limit
±2.5% Battery Discharge Current
(MAX17015B Only)
AC Adapter Detection
o Analog/PWM Adjustable Charge-Current Setting
o Battery Voltage Adjustable for 3 and 4 Cells
(MAX17005B) or 2 and 3 Cells (MAX17006B)
o Adjustable Battery Voltage (4.2V to 4.4V/Cell)
o Cycle-by-Cycle Current Limit
Battery Short-Circuit Protection
Fast Response for Pulse Charging
Fast System-Load-Transient Response
o Programmable Charge Current < 5A
o Automatic System Power Source Selection with
n-Channel MOSFET
o Internal Boost Diode
o +8V to +26V Input Voltage Range
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX17005BETP+
-40°C to +85°C 20 TQFN-EP**
MAX17006BETP+
-40°C to +85°C 20 TQFN-EP**
MAX17015BETP+
-40°C to +85°C 20 TQFN-EP**
+Denotes a lead(Pb)-free/RoHS-compliant package.
**EP = Exposed pad.
*Patent pending.
Pin Configuration and Minimal Operating Circuit appear at
end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.