MAX1677EEE Maxim Integrated Products, MAX1677EEE Datasheet - Page 15

• Manufacturer Part Number: MAX1677EEE
• Description: IC CONV DC-DC STEP-UP 16-QSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Up (Boost)r

Specifications of MAX1677EEE

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 3.3V or Adj Main, -28 ~ 28 V or Adj Secondary
• Current - Output: 350mA
• Frequency - Switching: 300kHz
• Voltage - Input: 0.7 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Power - Output: 696mW
• Output Voltage: 2.5 V to 5.5 V
• Output Current: 350 mA
• Input Voltage: 0.7 V to 5.5 V
• Supply Current: 35 uA
• Switching Frequency: 300 KHz
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Compact, High-Efficiency, Dual-Output
Step-Up and LCD Bias DC-DC Converter
reduce the output filter to 2.2µF. Ceramic capacitors will
Chip Information
exhibit lower ripple than equivalent value (or even higher
value) tantalums due to lower ESR.
TRANSISTOR COUNT: 1221
Layout Considerations
The MAX1677’s high-frequency operation makes PC
board layout important for minimizing ground bounce
and noise. Protect sensitive analog grounds by using a
star ground configuration. Minimize ground noise by
connecting PGND, the input bypass-capacitor ground
terminal, and the output filter-capacitor ground terminal
to a single point (star ground configuration). Also, mini-
mize lead lengths to reduce stray capacitance and
trace resistance. Where an external resistor-divider is
used to set output voltage, the trace from FB or LCDFB
to the feedback resistors should be extremely short to
minimize coupling from LX and LCDLX. To maximize
efficiency and minimize output ripple, use a ground
plane and connect the MAX1677 GND and PGND pins
directly to the ground plane. Consult the MAX1677
evaluation kit for a full PC board example.
______________________________________________________________________________________
15