DS2712E+ Maxim Integrated Products, DS2712E+ Datasheet - Page 9

• Manufacturer Part Number: DS2712E+
• Description: IC NIMH CHARGER 16TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of DS2712E+

• Function: Charge Management
• Battery Type: Nickel Metal Hydride (NiMH)
• Voltage - Supply: 4 V ~ 5.5 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Operating Supply Voltage: 5.5 V
• Supply Current: 250 uA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 20 C
• Charge Safety Timers: Yes
• Mounting Style: SMD/SMT
• Temperature Monitoring: Yes
• Uvlo Start Threshold: 3.5 V
• Uvlo Stop Threshold: 40 mV
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS2711/DS2712: Loose Cell NiMH Charger
DS2712 Parallel Charge Configuration with Switch-Mode Charge Current Regulation
The example in Figure 5 uses the DS2712 to regulate charge current as a switching (buck) regulator. ICHG is set
to 2A using RSNS = 0.056Ω. The effective charge current for each cell is ICHG x 0.484 = 968mA. The CSOUT
comparator output switches OFF when the voltage across the sense resistor goes above 0.125V and back ON
when the voltage drops below 0.100V. In this mode, the operating frequency is determined primarily by the value of
the inductor, the hysteresis, the input voltage, and the voltage on the cells. In some cases, a damping network may
be required to prevent overshoot with the batteries removed.
Figure 5. PARALLEL CONFIGURATION WITH SWITCH-MODE CURRENT
REGULATION (DS2712 ONLY)
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