 ASSP For Power Management Applications (Rechargeable Battery)
Synchronous Rectification DC/DC Converter IC for Charging Li-ion Battery
DESCRIPTION
MB39A132, which is used for charging Li-ion battery, is a synchronous rectification DC/DC converter IC adopting pulse width modification (PWM). It can control charge voltage and charge current separately and supports the N-ch MOS driver. In addition, MB39A132 is suitable for down-conversion.
MB39A132 has an AC adapter detection comparator, which is independent of the DC/DC converter control block, and can control the source supplying voltage to the system.
MB39A132 supports a wide input voltage range, enables low current consumption in standby mode, and can control the charge voltage and charge current with high precision, which is perfect for the built-in Li-ion battery charger used in devices such as notebook PC.
FEATURES
• Supports 2/3/4-Cell battery pack
• Two built-in constant current control loops
• Built-in AC adapter detection function (ACOK pin)
• Charge voltage setting accuracy: ±0.5 (Ta = +25 °C to +85 °C)
• Charge voltage control setting can be selected without using any external resistor. (4.00 V/Cell, 4.20 V/Cell, 4.35 V/Cell)
Output voltage can also be freely set by using the external resistor.
• Two built-in high-precision current detection amplifiers
: Input offset voltage:+3 mV
: Detection accuracy: ±1 mV (+INC1, +INC2 = 3 V to VCC)
• Charge current control setting can be selected without using any external resistor. (RS = 20 mΩ: 2.85 A)
Charge current can also be freely set by using the external resistor.
• Switching frequency can be set by using the external resistor
(MB39A132 has a built-in frequency setting capacitor.):100 kHz to 2 MHz
• Built-in off time control function
• In standby mode (Icc = 6 μA Typ), only the AC adapter detection function is in operation.
• Built-in output stage for N-ch MOS FET synchronous rectification
• Built-in charge stop function at low VCC pin voltage
• Built-in soft-start function whose setting time can be adjusted
• Equipped with the function enabling the independent operation of the AC adapter current detection amplifier
• Package: QFN-32
APPLICATIONS
• Internal charger used in notebook PC
• Handy terminal device
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