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19-4759; Rev 1; 1/99
MAX1701 Evaluation Kit
________________General Description
The MAX1701 evaluation kit provides a regulated 3.3V output while operating on input voltages as low as 0.7V. The input may be a DC source or a 1 to 2-cell battery. Efficiency is up to 95% with output loads up to 200mA. The kit, which uses surface-mount components, is fully assembled and tested for quick evaluation. Jumpers are provided to select the output voltage, switching mode, and shutdown control. This EV kit can also be used to evaluate the MAX1700. Simply order a free sample of the MAX1700EEE and replace the MAX1701EEE that comes installed on the board.
____________________________Features
o 3.3V Output o 200mA Output o 0.7V to 3.5V Input o Up to 95% Efficiency o 3A Shutdown Current o 300kHz PWM Operation o Optional Low-Power PFM Mode o Small Surface-Mount Components
Evaluates: MAX1700/MAX1701
____________________Component List
DESIGNATION QTY C1 C2, C3 C4 C5 1 2 1 1 DESCRIPTION 22F, 25V, low-ESR tantalum capacitor AVX TPSD226M025R0200 Sprague 593D226X0025D 0.22F, 25V ceramic capacitors 0.10F, 25V ceramic capacitor 100F, 10V low-ESR tantalum capacitor AVX TPSD107M010R0100 or Sprague 593D107X0010D7 Not installed. Space for optional user capacitor. 0.5A, 20V Schottky diode Motorola MBR0520L 3-pin jumpers 2-pin jumpers 10H, 1.6A power inductor CoilCraft DO3316-103, Coiltronics UP1B-100, Sumida CDR74B-100 100k, 1% resistors Not installed 100k, 5% resistors 1M, 5% resistors 10, 5% resistor MAX1701EEE Shunts 3.4" x 2.4" printed circuit board MAX1700/MAX1701 data sheet
_______________Ordering Information
PART MAX1701EVKIT TEMP. RANGE 0C to +70C PIN-PACKAGE 16-pin QSOP
______________Component Suppliers
SUPPLIER AVX Coilcraft Coiltronics Sprague Sumida Motorola PHONE (803) 946-0690 (847) 639-6400 (561) 241-7876 (603) 224-1961 (847) 956-0666 (303) 675-2140 FAX (803) 626-3123 (847) 639-1469 (561) 241-9339 (603) 224-1430 (847) 956-0702 (303) 675-2150
C6, C7 D1 J1, J2, J3 J4, J5
0 1 3 2
_________________________Quick Start
The MAX1701 EV kit is shipped fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Verify that the shunts are connected as listed in Table 2 for a 3.3V output. 2) Connect a +1.1V to +3.3V supply to the pad marked VIN. The ground connects to the GND pad. Note: the input voltage may drop as low as 0.7V after startup. 3) Connect a voltmeter to the VOUT pad. 4) Turn on the power and verify that the output voltage is 3.3V. 5) Connect a load (if any).
L1
1
R1, R4, R6 R2, R3, R5 R7, R8, R9 R10, R11, R12 R13 U1 None None None
3 3 3 3 1 1 5 1 1
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX1701 Evaluation Kit Evaluates: MAX1700/MAX1701
_______________Detailed Description
Jumper Selection
Five jumpers on the printed circuit board allow user selection of several configurations. Table 1 lists the jumpers and their functions. Table 2 lists the jumper positions when the board is set for normal 3.3V output operation.
Component Selection
The final circuit performance is determined by the quality of the components surrounding the MAX1701. The power inductor must not saturate at the 1.6A maximum peak current produced by MAX1701. Inductors in the Component List all have high current ratings and low coil resistance.
Table 1. Jumper Functions
JUMPER SHUNT LOCATION 1 and 2 J1 2 and 3 Open 1 and 2 J2 2 and 3 Open 1 and 2 2 and 3 J3 Open Shorted J4 Open Shorted J5 Open CLK/SEL connected to CLK/SEL pad FB connected to GND FB connected to the resistor divider Shorted for normal operation Pull-ups disconnected PIN CONNECTION ONA connected to GND ONA connected to VOUT ONA is not controlled by the board ONB connected to GND ONB connected to VOUT ONB is not controlled by the board CLK/SEL connected to GND CLK/SEL connected to VOUT MAX1701 OPERATION MAX1701 is disabled if ONB is VOUT. MAX1701 is enabled. ONA must be driven by a signal connected to the ONA pad. MAX1701 is enabled. MAX1701 is disabled if ONA = GND. ONB must be driven by a signal connected to the ONB pad. Low-power mode, MAX1701 operates in the PFM mode. High-power mode, MAX1701 operates in the PWM mode. CLK/SEL pin can be driven by an external source to select power mode, or a 200kHz to 400kHz signal to control switching frequency. VOUT is preset to 3.3V. Resistors must be installed in R3 and R4 for proper circuit operation. VOUT connected to pull-up resistors. R7-R9 are disconnected so that MAX1701 shutdown current may be verified.
Table 2. Jumper Position for Normal 3.3V Operation
JUMPER J1 J2 J3 SHUNT LOCATION 2 and 3 1 and 2 2 and 3 PIN CONNECTION ONA connected to VOUT ONB connected to GND CLK/SEL connected to VOUT MAX1701 OPERATION MAX1701 is enabled. MAX1701 is enabled. High-power mode, MAX1701 operates in the PWM mode. VOUT is preset to 3.3V. This jumper must be shorted or resistors installed in R3 and R4 for proper circuit operation.
J4 J5 2
Shorted Shorted
FB connected to GND VOUT connected to pull-up resistors
_______________________________________________________________________________________
MAX1701 Evaluation Kit
The input and output capacitors must have low equivalent series resistance (ESR) to handle the high peak currents found in switching regulators. Low ESR is especially critical in low-voltage circuits to reduce the AC voltage across the capacitors. A higher ESR on the output capacitor will increase the output ripple. Consider using parallel capacitors to reduce the total ESR if the application requires lower output ripple. An additional output capacitor (C6) may be required for output current greater than 200mA or output voltages less than 3.3V. A low-ESR input capacitor must be located physically close to the inductor. The Schottky diode must be connected between LX and P OUT as close to the IC as possible. A Schottky diode is specified for the lower forward voltage drop as well as the fast switching characteristic. Most Schottky diodes with a sufficient current rating will work. The diode for the evaluation board was selected for its small size. A separate low-noise ground plane connects pin 5 to the reference and signal grounds. This low-noise ground plane is then connected to the power-ground plane at the PGND pin (Figure 4).
Evaluates: MAX1700/MAX1701
VIN 0.7V TO 3.5V C1 22F 25V
GND
R2 OPEN 1 R1 100k 1% C2 0.22F 13 LBP LX 15
L1 10H D1 C5 100F 10V R13 10 C3 0.22F 11 C7 OPEN J4 R4 100k 1% R7 100k R8 100k R9 100k AO AO 9 LO BATT C4 0.1F J5 C6 OPEN VOUT
2 3
LBN REF
POUT
OUT
14 R3 OPEN
U1
MAX1701
VOUT FB
3 ONA J1 2 1 3 ONB J2 2 1
R11 1M 8 ONA
7
LBO ONB POK
16
6
PWR 0K
3 CLK/SEL J3 2 1 R10 1M R12 1M 4 CLK/SEL GND 5 PGND 12 AIN 10 R6 100k 1% R5 OPEN AIN
Figure 1. MAX1701 EV Kit Schematic
_______________________________________________________________________________________ 3
MAX1701 Evaluation Kit Evaluates: MAX1700/MAX1701
1.0"
1.0"
Figure 2. MAX1701 EV Kit Component Placement Guide
Figure 3. MAX1701 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX1701 EV Kit PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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