_______________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
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
MAX710 Evaluation Kit
________________________________________________________________
Maxim Integrated Products
1
PART
TEMP. RANGE
BOARD TYPE
MAX710EVKIT
0C to +70C
Surface Mount
QTY
DESCRIPTION
C1, C2
2
C3
1
C4
1
4.7F, 16V tantalum capacitor
Sprague 595D475X0016A2T
C5
0
D1
1
Schottky diode
Motorola MBRS130LT3
L1
1
R1, R2, R7, R8
0
R3, R4, R5
3
U1
1
MAX710ESE (SO-16)
JU1, JU6
2
3-pin headers
JU5
1
4-pin header
None
3
Shunts
None
1
MAX710 PC board
Open
0.1F ceramic capacitor
100F, 16V low-ESR
tantalum capacitors
AVX TPSE107M016R0100 or
Sprague 593D107X0016E2W
SUPPLIER
PHONE
FAX
AVX
(803) 946-0690
(803) 626-3123
______________Component Suppliers
DESIGNATION
22H inductor
Sumida CD75-220,
Coiltronics UP2-220, or
Coilcraft DO3316P-223
Open
100k
, 5% resistors
____________________Component List
______________Ordering Information
Note: To evaluate the MAX711, request a MAX711ESE free
sample with the MAX710 EV kit.
Note: Please indicate that you are using the MAX710 when
contacting these component suppliers.
None
1
MAX710 data sheet
JU2, JU3, JU4
3
2-pin headers
Coilcraft
(847) 639-6400
(847) 639-1469
Coiltronics
(561) 241-7876
(561) 241-9339
Dale-Vishay
(402) 564-3131
(402) 563-6418
Motorola
(602) 303-5454
(602) 994-6430
Sprague
(603) 224-1961
(603) 224-1430
Sumida
(847) 956-0666
(847) 956-0702
Vishay/Vitramon
(203) 268-6261
(203) 452-5670
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.
_________________________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.
_______________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.
Jumper Selection
The 3-pin header JU1 selects output voltage. Table 1
lists the selectable jumper options.
Table 1. Jumper JU1 Functions
The 2-pin header JU2 selects shutdown mode. Table 2
lists the selectable jumper options.
Table 2. Jumper JU2 Functions
The 2-pin header JU3 selects standby mode. Table 3
lists the selectable jumper options.
Table 3. Jumper JU3 Functions
The 2-pin header JU4 selects the current limit. Table 4
lists the selectable jumper options.
Table 4. Jumper JU4 Functions
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.
Table 5. Jumper JU5 Functions
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
Evaluates: MAX710/MAX711
MAX710 Evaluation Kit
2
_______________________________________________________________________________________
SHUNT
LOCATION
3/
5
5
PIN
OUTPUT
1 and 2
Connected to V+
V
OUT
= 3.3V
2 and 3
Connected to GND
V
OUT
= 5V
SHUNT
LOCATION
SHDN
PIN
OUTPUT
On
Connected to GND
Shutdown mode,
V
OUT
= 0V
Off
Connected to V+
MAX710 enabled,
V
OUT
= 3.3V or 5V
SHUNT
LOCATION
STDBY
PIN
OUTPUT
On
Connected to GND
Standby mode
Off
Connected to V+
Normal operation
SHUNT
LOCATION
ILIM PIN
CURRENT LIMIT
On
Connected to V+
ILIM = 0.8A
Off
Connected to GND
ILIM = 1.5A
SHUNT
LOCATION
N/
E
PIN
OPERATING
MODE
1 and 2
Connected to LBO
High-efficiency,
V
IN(MAX)
= 11V
(LBI- must be con-
nected to V
OUT
(JU6, 2 and 3))
1 and 3
Connected to GND
High-efficiency,
V
IN(MAX)
= 7V
SHUNT
LOCATION
LBI- PIN
1 and 2
Connected to REF
2 and 3
Connected to VOUT
1 and 4
Connected to V+
Low-noise,
V
IN(MAX)
= 11V
Evaluates: MAX710/MAX711
MAX710 Evaluation Kit
_______________________________________________________________________________________
3
MAX710
U1
R8
11
JU2
VIN
1.8V TO 11V
V+
VOUT
3.3V
JU3
V+
V+
3
2
1
JU5
4
V+
V+
4
5
REF
LBO
ILIM
LBI+
LX
LX
PGND
PGND
PS
OUT
LBI-
GND
1
JU6
JU1
(R2)
OPEN
(R1)
OPEN
(C5)
OPEN
V+
REF
3
2
JU4
3
7
8
13
REF
( ) REFER TO MAX711.
C3
0.1
F
1
2
2
16
12
9
6
14
10
3
1
15
R7
SHORT
R3
100k
C1
100
F
16V
SHUNT
LOCATION
JU1 1-2
V+
GND
3.3V
5.0V
JU1 2-3
3/5 PIN
MAX710
OUTPUT
C2
100
F
16V
C4
4.7
F
16V
L1
22
H
OPEN
MBRS130T3
D1
R4
100K
R5
100K
SHDN
SHDN
STDBY
STDBY
LBO
N/E
3/5
(FB)
Figure 1. MAX710 EV Kit Schematic
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
MAX710 Evaluation Kit
Figure 2. MAX710 EV Kit Component Placement Guide--
Component Side
Figure 3. MAX710 EV Kit PC Board Layout--Component Side
1.0"
1.0"
Figure 4. MAX710 EV Kit PC Board Layout--Solder Side
1.0"
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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