MAX17005B
1.2MHz, Low-Cost, High-Performance Chargers
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Industry's Highest Switching-Frequency Notebook Battery Chargers
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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 (MAX17015B Only)
- AC Adapter Detection
- Analog/PWM Adjustable Charge-Current Setting
- Battery Voltage Adjustable for 3 and 4 Cells (MAX17005B) or 2 and 3 Cells (MAX17006B)
- 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
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The MAX17005B/MAX17006B/MAX17015B are high-frequency 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 construction 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 current-sense amplifiers provide fast cycle-by-cycle current-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 analog output that is proportional to the adapter current. In the MAX17015B, this current monitor remains active when the adapter is absent to monitor battery discharge 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 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 MAX17005B/MAX17006B/MAX17015B 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
- Portable Equipment with Rechargeable Batteries
- Tablet PCs
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MAX17005B
Documentation
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Software & Part Ecosystem
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Highly Integrated Level 2 SMBus Battery Chargers |
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Switching Battery Chargers3 |
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PRODUCTION |
Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting |
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PRODUCTION |
Low-Cost, Multichemistry Battery-Charger Building Block |
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PRODUCTION |
Multichemistry Battery Chargers with Automatic System Power Selector |
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Evaluation Kits 1
MAX17005BEVKIT
Evaluation Kit for the MAX17005B
Features and Benefits
- Analog/PWM Input Charge-Current Setting
- Up to 1.2MHz Switching Frequency
- Programmable Charge Current Up to 3.5A
- Monitors Input/Outputs
- Analog Input Charge-Current-Setting Voltage
- AC Adapter Input Current
- AC Adapter Presence
- Automatic System Power-Source Selection
- Up to 17.4V (max) Battery Voltage
- 10V to 25V Adapter-Input Operation
- Demonstrates the MAX17005B IC Internal Boost Diode
- Cycle-by-Cycle Current Limit
- Multichemistry Battery Charger
- Fully Assembled and Tested
Product Detail
The MAX17005B evaluation kit (EV kit) is a complete and fully assembled and tested surface-mount PCB that features the MAX17005B highly integrated, multichemistry battery charger control IC. The MAX17005B EV kit utilizes two single-package n-channel MOSFETs for high-side and low-side switching for the MAX17005B internal synchronous step-down converter, and two n-channel MOSFETs and one p-channel MOSFET for the main power-source selection.
The MAX17005B EV kit is capable of supplying power to a system load while simultaneously charging 3- or 4-cell Li+ battery packs. During normal operation, the EV kit circuit automatically selects the ADAPTER input or the battery as the main power source for supplying power to the system load. If the ADAPTER input is selected as the main source and the EV kit's input-current limit is exceeded, the charge current is reduced automatically to give priority to the system load.
The EV kit's input-source-current limit is set to 4A while the maximum battery-charge voltage and charge-current thresholds can be configured up to 17.4V and 3.5A, respectively. The thresholds can be adjusted by using on-board circuitry or by connecting analog signals to the respective test points on the EV kit. A digital output signal (active-low ACOK) indicates the presence of a valid AC adapter voltage at the ADAPTER input source. The MAX17005B EV kit PCB is rated for 0°C to +70°C; however, the MAX17005B IC is rated for -40°C to +85°C.
Applications
- Notebook Computers
- Portable Equipment with Rechargeable Batteries
- Tablet PCs