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MAX710 Evaluation Kit
_______________General Description
The MAX710 evaluation kit (EV kit) is a step-up DC-DC converter with a linear-regulator output. The MAX710 accepts a +1.8V to +11V input and converts it to a 3.3V or 5V output for up to 250mA currents. The EV kit is optimized for battery applications where the input varies above and below the regulated output voltage. It can be set in two modes: one optimized for lowest noise, the other for highest efficiency. The MAX710 EV kit is a fully assembled and tested surface-mount circuit board. It can also be used to evaluate the MAX711, which has an adjustable output voltage (2.7V to 5.5V). Additional pads on the board accommodate the external feedback resistors for setting different output voltages.
____________________________Features
o Step-Up/Down Voltage Conversion o +1.8V to +11V Input Range o 3.3V or 5V Selectable Output Voltage (MAX710) o 2.7V to 5.5V Adjustable Output Voltage (MAX711) o 250mA Output Current o No External FETs Required o Output is Fully Off during Shutdown o 5A Max Shutdown Current o Low-Battery Comparator o Low-Noise and High-Efficiency Modes o Surface-Mount Components o Fully Assembled and Tested
Evaluates: MAX710/MAX711
____________________Component List
DESIGNATION QTY DESCRIPTION 100F, 16V low-ESR tantalum capacitors AVX TPSE107M016R0100 or Sprague 593D107X0016E2W 0.1F ceramic capacitor 4.7F, 16V tantalum capacitor Sprague 595D475X0016A2T Open Schottky diode Motorola MBRS130LT3 22H inductor Sumida CD75-220, Coiltronics UP2-220, or Coilcraft DO3316P-223 Open 100k, 5% resistors MAX710ESE (SO-16) 3-pin headers 2-pin headers 4-pin header Shunts MAX710 PC board MAX710 data sheet
______________Ordering Information
PART MAX710EVKIT TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
C1, C2
2
C3 C4 C5 D1
1 1 0 1
Note: To evaluate the MAX711, request a MAX711ESE free sample with the MAX710 EV kit.
______________Component Suppliers
SUPPLIER AVX Coilcraft Coiltronics Dale-Vishay Motorola Sprague Sumida Vishay/Vitramon PHONE (803) 946-0690 (847) 639-6400 (561) 241-7876 (402) 564-3131 (602) 303-5454 (603) 224-1961 (847) 956-0666 (203) 268-6261 FAX (803) 626-3123 (847) 639-1469 (561) 241-9339 (402) 563-6418 (602) 994-6430 (603) 224-1430 (847) 956-0702 (203) 452-5670
L1
1
R1, R2, R7, R8 R3, R4, R5 U1 JU1, JU6 JU2, JU3, JU4 JU5 None None None
0 3 1 2 3 1 3 1 1
Note: Please indicate that you are using the MAX710 when contacting these component suppliers.
________________________________________________________________ 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 408-737-7600 ext. 3468.
MAX710 Evaluation Kit Evaluates: MAX710/MAX711
_________________________Quick Start
The MAX710 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. 1) Connect a +1.8V to +11V supply to the VIN pad. Connect ground to the GND pad. 2) Connect a voltmeter to the VOUT pad. 3) Place the shunt on JU1 across pins 1 and 2. 4) Turn on the power supply and verify that the output voltage is 3.3V. For a 5V output, remove the shunt from JU1 pins 1 and 2, and place it across JU1 pins 2 and 3.
Table 3. Jumper JU3 Functions
SHUNT LOCATION On Off STDBY PIN Connected to GND Connected to V+ OUTPUT Standby mode Normal operation
The 2-pin header JU4 selects the current limit. Table 4 lists the selectable jumper options.
Table 4. Jumper JU4 Functions
SHUNT LOCATION On Off ILIM PIN Connected to V+ Connected to GND CURRENT LIMIT ILIM = 0.8A ILIM = 1.5A
_______________Detailed Description
The MAX710 EV kit is a step-up DC-DC converter with a linear-regulator output. It accepts a +1.8V to +11V input and converts it to a 3.3V or 5V output for up to 250mA currents. The EV kit is shipped configured for a 3.3V output.
The 4-pin header JU5 selects low-noise or high-efficiency mode. Refer to the MAX710/MAX711 data sheet for information on operating configurations. Table 5 lists the selectable jumper options.
Jumper Selection
The 3-pin header JU1 selects output voltage. Table 1 lists the selectable jumper options.
Table 5. Jumper JU5 Functions
SHUNT LOCATION N/E PIN OPERATING MODE High-efficiency, VIN(MAX) = 11V (LBI- must be connected to VOUT (JU6, 2 and 3)) High-efficiency, VIN(MAX) = 7V Low-noise, VIN(MAX) = 11V
Table 1. Jumper JU1 Functions
SHUNT LOCATION 1 and 2 2 and 3 5 3/5 PIN Connected to V+ Connected to GND OUTPUT VOUT = 3.3V VOUT = 5V 1 and 3 1 and 4 Connected to GND Connected to V+ 1 and 2 Connected to LBO
The 2-pin header JU2 selects shutdown mode. Table 2 lists the selectable jumper options.
Table 2. Jumper JU2 Functions
SHUNT LOCATION On Off SHDN PIN Connected to GND Connected to V+ OUTPUT Shutdown mode, VOUT = 0V MAX710 enabled, VOUT = 3.3V or 5V
The 3-pin header JU6 connects LBI- to either the output voltage or the reference voltage. Table 6 lists the selectable jumper options.
Table 6. Jumper JU6 Functions
SHUNT LOCATION 1 and 2 2 and 3 LBI- PIN Connected to REF Connected to VOUT
The 2-pin header JU3 selects standby mode. Table 3 lists the selectable jumper options.
2
_______________________________________________________________________________________
MAX710 Evaluation Kit
Low-Battery Comparator Output
The MAX710 has an on-chip comparator for powergood detection that can be used to detect low-battery voltage. The comparator's LBI- input is connected to either VOUT or reference, and its LBI+ input is connected to an external resistor divider, R7 or R8. Refer to the Low-Battery Comparator section of the MAX710/ MAX711 data sheet for instructions on selecting R7 and R8 values.
Evaluating Other Output Voltages
To generate output voltages other than 3.3V or 5V, replace the MAX710 with the MAX711 (adjustable output), and select the external voltage resistor divider, R1 and R2. The only other modification required is removing the shunt from JU1. Refer to the Output Voltage Selection section in the MAX710/MAX711 data sheet for instructions on selecting R1 and R2 values. C5 is an optional space for a feed-forward capacitor.
Evaluates: MAX710/MAX711
VIN 1.8V TO 11V V+ R3 100k SHDN R4 100K V+ STDBY JU3 R5 100K JU4 7 11 4 JU2 5 R7 SHORT R8 OPEN LBI+ SHDN LX PGND STDBY LX 1 16 2 15 12 9 3 10 2 JU6 1 REF D1
C1 100F 16V L1 22H
SHUNT LOCATION 3/5 PIN JU1 1-2 JU1 2-3 V+ GND
MAX710 OUTPUT 3.3V 5.0V
V+ MBRS130T3 C2 100F 16V
U1 MAX710
3 ILIM
PGND PS OUT LBI-
V+ 4 3 2 LBO 1 JU5
VOUT 3.3V C4 4.7F 16V JU1 V+ 1 2 3 (R2) OPEN (R1) OPEN (C5) OPEN
V+
N/E 3/5 (FB) 6 14 GND
8 REF 13 C3 0.1F
LBO REF
( ) REFER TO MAX711.
Figure 1. MAX710 EV Kit Schematic
_______________________________________________________________________________________
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MAX710 Evaluation Kit Evaluates: MAX710/MAX711
1.0"
Figure 2. MAX710 EV Kit Component Placement Guide-- Component Side
1.0"
Figure 3. MAX710 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX710 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) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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