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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 sur-
face-mount circuit board. It can also be used to evalu-
ate the MAX711, which has an adjustable output volt-
age (2.7V to 5.5V). Additional pads on the board
accommodate the external feedback resistors for set-
ting 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
5µA 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
100µF, 16V low-ESR
tantalum capacitors
AVX TPSE107M016R0100 or
Sprague 593D107X0016E2W
0.1µF ceramic capacitor
4.7µF, 16V tantalum capacitor
Sprague 595D475X0016A2T
Open
Schottky diode
Motorola MBRS130LT3
22µH inductor
Sumida CD75-220,
Coiltronics UP2-220, or
Coilcraft DO3316P-223
Open
100kΩ, 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
0°C to +70°C
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-effi-
ciency 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,
V
IN(MAX)
= 11V
(LBI- must be con-
nected to V
OUT
(JU6, 2 and 3))
High-efficiency,
V
IN(MAX)
= 7V
Low-noise,
V
IN(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
V
OUT
= 3.3V
V
OUT
= 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,
V
OUT
= 0V
MAX710 enabled,
V
OUT
= 3.3V or 5V
The 3-pin header JU6 connects LBI- to either the output
voltage or the reference voltage. Table 6 lists the selec-
table 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 power-
good detection that can be used to detect low-battery
voltage. The comparator’s LBI- input is connected to
either V
OUT
or reference, and its LBI+ input is connect-
ed 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 out-
put), and select the external voltage resistor divider, R1
and R2. The only other modification required is remov-
ing 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
100µF
16V
L1
22µH
SHUNT
LOCATION 3/5 PIN
JU1 1-2
JU1 2-3
V+
GND
MAX710
OUTPUT
3.3V
5.0V
V+
MBRS130T3
C2
100µF
16V
U1
MAX710
3
ILIM
PGND
PS
OUT
LBI-
V+
4
3
2
LBO
1
JU5
VOUT
3.3V
C4
4.7µF
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
0.1µF
LBO
REF
( ) REFER TO MAX711.
Figure 1. MAX710 EV Kit Schematic
_______________________________________________________________________________________
3
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
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.

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