MAX1677EVKIT

MAX1677EVKIT Datasheet

MAX1677 Evaluation Kit

Part	Datasheet
MAX1677EVKIT	MAX1677EVKIT (pdf)

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MAX1677 Evaluation Kit Evaluates MAX1677 The MAX1677 evaluation kit EV kit is a fully assembled and tested surface-mount circuit board that contains two separate switching-regulator circuits. The first circuit is configured for a +3.3V main output and +20V LCD bias voltage. It accepts inputs from +0.7V to +3.3V. The main +3.3V output supplies up to 350mA from a 2-cell input, or 140mA from a 1-cell input, while the LCD bias output supplies up to 12mA at +20V. The second circuit converts a +0.7V to +3.3V battery voltage to a +3.3V main output and a -20V LCD bias voltage. The main +3.3V output supplies up to 350mA from a 2-cell input, or 140mA from a 1-cell input, while the LCD bias output supplies 10mA at -20V. The MAX1677 features internal N-channel MOSFET switches, a synchronous rectifier, low-battery comparator, and selectable PFM/PWM mode. The MAX1677 EV kit provides low quiescent current and high up to 95% for maximum battery life. Operation at 300kHz allows the use of tiny surface-mount inductors. DESIGNATION QTY C1, C2, C10, C11 100µF, 10V low-ESR tantalum caps AVX TPSD107M010R0100 or Sprague 593D107X0010D2T C3, C5, C13, C14 4 0.1µF ceramic capacitors C4, C12 C8 C16, C17 4.7µF, 35V tantalum capacitors 2 AVX TPSC475M035R0600 or Sprague 595D475X0035C2T 2.2µF, 25V ceramic capacitor 1 United Chemi-Con/Marcon THCR30E1E225Z 1µF, 16V ceramic capacitors 2 Taiyo Yuden EMK316BJ105KL TDK C3216X7R1C105M C6, C7, C9, C15, D6 0 Not installed D1, D3 20V, 0.5A Schottky diodes Motorola MBR0520LT3 D2, D4, D5 40V, 0.5A Schottky diodes Motorola MBR0540T3 o +0.7V to MAINOUT Battery Input Voltage o Dual Output Voltages +3.3V Main Output and +20V LCD Bias Output +3.3V Main Output and -20V LCD Bias Output o All Outputs Also Adjustable with External Resistors o Up to 350mA from 2-Cell Input Main Output o Up to 140mA from 1-Cell Input Main Output o Up to 12mA Output Current LCD Bias Output o Internal N-Channel Switches and Synchronous Rectifier o 1µA IC Shutdown Current o 300kHz Switching Frequency o Surface-Mount Components o Fully Assembled and Tested PART MAX1677EVKIT Ordering Information TEMP. RANGE 0°C to +70°C IC PACKAGE 16 QSOP Component List DESIGNATION QTY L1, L3 10µH inductors Sumida CR54-100 L2, L4 R3 R4, R12 R5, R13 R11 R1, R2, 10µH inductors 2 Murata LQH4N100K04 TDK NLC32522T-100K 1 ±5% resistor 2 ±5% resistors 2 ±5% resistors 1 ±5% resistor 0 Not installed U1, U2 None 2 MAX1677EEE 6 3-pin headers 6 Shunts 1 MAX1677 PC board 1 MAX1677 data sheet Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at MAX1677 Evaluation Kit Evaluates MAX1677 Component Suppliers SUPPLIER AVX Dale-Vishay Motorola Murata Sprague Sumida Taiyo Yuden TDK United ChemiCon/Marcon PHONE 803-946-0690 402-564-3131 602-303-5454 814-237-1431 603-224-1961 708-956-0666 408-573-4150 847-390-4373 847-696-2000 FAX 803-626-3123 402-563-6418 602-994-6430 814-238-0490 603-224-1430 708-956-0702 408-573-4159 847-390-4428 847-696-9278 Note Please indicate that you are using the MAX1677 when contacting these component suppliers. Start The MAX1677 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. +3.3V and +LCD Output 1 Connect a +1.1V to +3.3V supply to the VIN pad. Connect the ground to the GND pad. Note The input voltage may drop as low as 0.7V after startup. 2 Connect voltmeters to the VOUT and +LCDOUT pads. 3 Verify that the shunts are across pins 2 and 3 on JU1, JU2, and JU3. 4 Turn on the power supply and verify that the main output is at +3.3V and the LCD bias output is at +20V. +3.3V and -LCD Output 1 Connect a +1.1V to +3.3V supply to the VIN pad. Connect the ground to the GND pad. Note The input voltage may drop as low as 0.7V after start-up. 2 Connect voltmeters to the VOUT and -LCDOUT pads. 3 Verify that the shunts are across pins 2 and 3 on JU4, JU5, and JU6. 4 Turn on the power supply and verify that the main output is at +3.3V and the -LCD Bias output is at -20V. For instructions on selecting the feedback resistors for other output voltages, refer to the Design Procedure section in the MAX1677 data sheet.

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MAX1677 Evaluation Kit

Evaluates MAX1677

The MAX1677 evaluation kit EV kit is a fully assembled and tested surface-mount circuit board that contains two separate switching-regulator circuits. The first circuit is configured for a +3.3V main output and +20V LCD bias voltage. It accepts inputs from +0.7V to +3.3V. The main +3.3V output supplies up to 350mA from a 2-cell input, or 140mA from a 1-cell input, while the LCD bias output supplies up to 12mA at +20V.

The second circuit converts a +0.7V to +3.3V battery voltage to a +3.3V main output and a -20V LCD bias voltage. The main +3.3V output supplies up to 350mA from a 2-cell input, or 140mA from a 1-cell input, while the LCD bias output supplies 10mA at -20V.

The MAX1677 features internal N-channel MOSFET switches, a synchronous rectifier, low-battery comparator, and selectable PFM/PWM mode. The MAX1677 EV kit provides low quiescent current and high up to 95% for maximum battery life. Operation at 300kHz allows the use of tiny surface-mount inductors.

DESIGNATION QTY

C1, C2, C10, C11
100µF, 10V low-ESR tantalum caps AVX TPSD107M010R0100 or Sprague 593D107X0010D2T

C3, C5, C13, C14
4 0.1µF ceramic capacitors

C4, C12 C8

C16, C17
4.7µF, 35V tantalum capacitors 2 AVX TPSC475M035R0600 or

Sprague 595D475X0035C2T
2.2µF, 25V ceramic capacitor 1 United Chemi-Con/Marcon

THCR30E1E225Z
1µF, 16V ceramic capacitors 2 Taiyo Yuden EMK316BJ105KL

TDK C3216X7R1C105M

C6, C7, C9, C15, D6
0 Not installed

D1, D3
20V, 0.5A Schottky diodes Motorola MBR0520LT3

D2, D4, D5
40V, 0.5A Schottky diodes Motorola MBR0540T3
o +0.7V to MAINOUT Battery Input Voltage o Dual Output Voltages
+3.3V Main Output and +20V LCD Bias Output +3.3V Main Output and -20V LCD Bias Output
o All Outputs Also Adjustable with External Resistors
o Up to 350mA from 2-Cell Input Main Output o Up to 140mA from 1-Cell Input Main Output o Up to 12mA Output Current LCD Bias Output o Internal N-Channel Switches and Synchronous

Rectifier
o 1µA IC Shutdown Current o 300kHz Switching Frequency o Surface-Mount Components o Fully Assembled and Tested

PART MAX1677EVKIT
Ordering Information

TEMP. RANGE 0°C to +70°C

IC PACKAGE 16 QSOP

Component List

DESIGNATION QTY

L1, L3
10µH inductors Sumida CR54-100

L2, L4

R3 R4, R12 R5, R13

R11 R1, R2,
10µH inductors 2 Murata LQH4N100K04

TDK NLC32522T-100K 1 ±5% resistor 2 ±5% resistors 2 ±5% resistors 1 ±5% resistor
0 Not installed

U1, U2

None
2 MAX1677EEE 6 3-pin headers 6 Shunts 1 MAX1677 PC board 1 MAX1677 data sheet

Maxim Integrated Products 1

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at

MAX1677 Evaluation Kit

Evaluates MAX1677

Component Suppliers

SUPPLIER AVX Dale-Vishay Motorola Murata Sprague Sumida Taiyo Yuden TDK

United ChemiCon/Marcon

PHONE 803-946-0690 402-564-3131 602-303-5454 814-237-1431 603-224-1961 708-956-0666 408-573-4150 847-390-4373
847-696-2000

FAX 803-626-3123 402-563-6418 602-994-6430 814-238-0490 603-224-1430 708-956-0702 408-573-4159 847-390-4428
847-696-9278

Note Please indicate that you are using the MAX1677 when contacting these component suppliers.

Start

The MAX1677 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed.
+3.3V and +LCD Output 1 Connect a +1.1V to +3.3V supply to the VIN pad.

Connect the ground to the GND pad. Note The input voltage may drop as low as 0.7V after startup.
2 Connect voltmeters to the VOUT and +LCDOUT pads.
3 Verify that the shunts are across pins 2 and 3 on JU1, JU2, and JU3.
4 Turn on the power supply and verify that the main output is at +3.3V and the LCD bias output is at +20V.
+3.3V and -LCD Output 1 Connect a +1.1V to +3.3V supply to the VIN pad.

Connect the ground to the GND pad. Note The input voltage may drop as low as 0.7V after start-up.
2 Connect voltmeters to the VOUT and -LCDOUT pads.
3 Verify that the shunts are across pins 2 and 3 on JU4, JU5, and JU6.
4 Turn on the power supply and verify that the main output is at +3.3V and the -LCD Bias output is at -20V.

For instructions on selecting the feedback resistors for other output voltages, refer to the Design Procedure section in the MAX1677 data sheet.

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Datasheet ID: MAX1677EVKIT 647248