LTZ1000 Charger

60V, 250mA Linear charger based on Linear Technology LTC4079. Features constant voltage, constant current, current sensing and reverse current protection. Charging can be terminated by either C/10 or adjustable timer.  A Maxim MAX8212, a voltage detector monitor the battery voltage and disconnect the load when the voltage is too low.
Useful for LTZ1000 circuit when an under-voltage condition can destroy the chip. 

The charger is designed for NiCd or Pb, 1000 - 2200mA/h rechargeable battery, and provides 75mA to the load; when the battery is charged, the circuit switches to C/50. If the battery voltage falls below 10V, a voltage monitor disconnects the load, avoiding overheating LTZ1000 due to the increased temperature set-point.
Everyone can order the board from us assembled and tested; use our contact form.

Part    Value   Device   Package

• C1  10u    CPOL-EU   SMC_D
• C2  100n  C-EU_C1206 
• C3  1u      C-EU_C1206  
• C4  100n  C-EU_C1206
• F1  0.5A   MF-NSMF050-2  Bourns  FUSC3216X85N
• F2  200mA MF-NSMF020-2 Bourns FUSC3216X85N
• IC1 LTC4079  Analog Devices  DFN10-3X3
• IC2 MAX8212CS  Maxim SO08
• J1  Connector 1X02-PTH  M1X2
• J2  Connector 1X03-PTH  M1X3
• J3  Connector 1X03-PTH  M1X3
• Q2 DMP3099 MOSFET-PCHANNEL Diodes Incorporated SOT23-3
• R1 10k   R-EU_R0805 
• R2 4k12 R-EU_R0805 0.1% 25ppm 
• R3 2M    R-EU_R0805 0.1% 25ppm 
• R4 200k R-EU_R0805 0.1% 25ppm 
• R5 50k   R-EU_R1206 1% 100ppm
• R6 100k R-EU_R0805 0.1% 25ppm 
• R7 768k R-EU_R0805 0.1% 25ppm 
• R8 86k6 R-EU_R0805 0.1% 25ppm 
• R9 10k   R-EU_R1206 1% 100ppm 
• R10 1M  R-EU_R1206 1% 100ppm