Overview: CN3600 is a PFM mode fixed-off-time, step-down single-cell NiMH battery charge management integrated circuit. The CN3600 has an input voltage range of 2.7V to 6.5V, requires few external components, is simple to apply, and is ideal for single-cell NiMH battery charge management applications. CN3600 charges a single-cell NiMH battery using constant current and trickle charge modes. After power-on, CN3600 first charges the battery using constant current mode. When the battery voltage reaches 1.36V, it enters trickle charge mode and starts the internal timer. In trickle charge mode, it enters the end state when the timer ends or the battery voltage reaches the maximum voltage (typical value 1.46V). In the end state, no current flows into the battery. When the battery voltage drops below the recharge threshold, it automatically enters the recharge mode and starts a new charging cycle. The CN3600 switching frequency can reach 500KHz, allowing the use of small inductors and capacitors. Other features include two open-drain status indicator outputs, battery overvoltage protection, and chip overtemperature protection. CN3600 is available in an 8-pin eSOP package.

Product Parameters

Main Functions: PFM step-down mode single-cell NiMH battery charging management integrated circuit

Operating Mode: Switching

Battery Type: Nickel-metal hydride battery

Number of Batteries: 1

Output Voltage Range: 0V-1.5V

Input Voltage Range: 2.7V-6.5V

Maximum Charging Current: 1A

Operating Current: 320uA

Solar Power Supply: Yes

Thermal Modulation: Overtemperature Protection

Packaging Form: eSOP8

Switching Frequency: 500KHz

Built-in Power Tube: Yes

Applications:

l Independent NiMH battery charger

l Car model

l Toys

l Devices using AA or AAA batteries

Features:

l Input voltage range: 2.7V to 6.5V

l Operating current: 320uA@VIN=5V

l Can automatically adjust the charging current according to the load capacity of the input power supply

l Can be powered by solar panels

l Switching frequency up to 500KHz

l Maintaining the charging mode can ensure that the battery is fully charged

l Selectable inductor current peak (i _peak )

l Charging ends when the battery voltage reaches 1.46V or via timer

l Automatic recharging function

l Battery overvoltage protection

l Chip overtemperature protection

l Two open-drain status indicator outputs

l Operating temperature range: -40°C to 85°C

l Uses eSOP-8 package

l Lead-free product, RoHS compliant, halogen-free