MAX17005 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – 1.2MHz Low-Cost, High-Performance Chargers

19-4041; Rev 0; 2/08
EVAALVUAAILTAIOBNLEKIT
1.2MHz Low-Cost,
High-Performance Chargers
General Description
The MAX17005/MAX17006/MAX17015 are high-frequen-
cy multichemistry battery chargers. These circuits fea-
ture 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 MAX17015, this current monitor remains active
when the adapter is absent to monitor battery dis-
charge current.
The MAX17005 charges three or four Li+ series cells,
and the MAX17006 charges two or three Li+ series
cells. The MAX17015 adjusts the charge voltage setting
and the number of cells through a feedback resistor-
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 MAX17005/MAX17006/MAX17015 are available 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
♦ High Switching Frequency (1.2MHz)
♦ Controlled Inductor Current-Ripple Architecture
Reduced BOM Cost
Small Inductor and Output Capacitors
♦ ±0.4% Accurate Charge Voltage
♦ ±2.5% Accurate Input-Current Limiting
♦ ±3% Accurate Charge Current
♦ Single-Point Compensation
♦ Monitor Outputs for
±2.5% Accurate Input Current Limit
±2.5% Battery Discharge Current
(MAX17015 only)
AC Adapter Detection
♦ Analog/PWM Adjustable Charge-Current Setting
♦ Battery Voltage Adjustable for 3 and 4 Cells
(MAX17005) or 2 and 3 Cells (MAX17006)
♦ Adjustable Battery Voltage (4.2V to 4.4V/Cell)
♦ Cycle-by-Cycle Current Limit
Battery Short-Circuit Protection
Fast Response for Pulse Charging
Fast System-Load-Transient Response
♦ Programmable Charge Current < 5A
♦ Automatic System Power Source Selection with
n-Channel MOSFET
♦ Internal Boost Diode
♦ +8V to +26V Input Voltage Range
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX17005ETP+
-40°C to +85°C
20 Thin QFN
(4mm x 4mm)
T2044-3
MAX17006ETP+
-40°C to +85°C
20 Thin QFN
(4mm x 4mm)
T2044-3
MAX17015ETP+
-40°C to +85°C
20 Thin QFN
(4mm x 4mm)
+Denotes a lead-free package.
T2044-3
*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.