19-3456; Rev 0; 10/04
MAX1518 Evaluation Kit
General Description
The MAX1518 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains a
step-up switching regulator, a positive charge pump
postregulated by a high-voltage linear regulator, a neg-
ative charge pump postregulated by a high-voltage
negative linear regulator, and five high-current opera-
tional amplifiers. The step-up switching circuit is config-
ured for a +13V output (VMAIN) and provides up to
650mA from a +4.5V to +5.5V DC supply voltage.
The positive linear regulator is configured for a +25V
output (VPOS) using two charge-pump stages provid-
ing up to 10mA. The negative linear regulator is config-
ured for a -8V output (VNEG) using a single charge-
pump stage providing up to 15mA. The DC input
source or the step-up switching regulator output pro-
vides power for the positive charge-pump input. The
DC input source or the power ground provides power
for the negative charge-pump input.
The MAX1518 EV kit demonstrates low-quiescent cur-
rent and high efficiency for maximum battery life.
Operation at 1.2MHz allows the use of tiny surface-
mount components.
o
+4.5V to +5.5V Input Range
o
Output Voltages
o
+13V Output at 650mA (VMAIN)
o
+25V Output at 10mA (VPOS)
o
-8V Output at 15mA (VNEG)
o
Adjustable Output Voltages (External Resistors)
o
1.2MHz Switching Frequency
o
Five High-Performance Operational Amplifiers
o
Low-Profile Surface-Mount Components
o
Fully Assembled and Tested
Features
Evaluates: MAX1518
Ordering Information
PART
MAX1518EVKIT
TEMP RANGE
0°C to +70°C
IC PACKAGE
32 TQFN
5mm x 5mm
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
100µF
±20%,
16V aluminum
electrolytic capacitor
Sanyo 16MV100UAX
10µF
±20%,
6.3V X5R ceramic
capacitors (1206)
TDK C3216X5R0J106M-0.85
4.7µF
±20%,
16V X5R ceramic
capacitors (1210)
TDK C3225X5R1C475M-1.15
0.1µF
±10%,
50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H104K
0.47µF
±10%,
25V X5R ceramic
capacitor (1206)
TDK C3216X5R1E474KT-0.90
0.22µF, 50V X7R ceramic
capacitors (0805)
Taiyo Yuden UMK212BJ224MG
TDK C2012X7R1H224M
DESIGNATION
C12
C13, C19, C20,
C21, C30
C15
QTY
1
DESCRIPTION
220pF
±10%,
50V C0G ceramic
capacitor (0603)
TDK C1608C0G1H221K
Not installed (0603)
0.22µF
±10%,
10V X7R ceramic
capacitor (0603)
Taiyo Yuden LMK107BJ224KA
0.47µF
±10%,
16V X7R ceramic
capacitor (0805)
TDK C2012X7R1C474K-0.60
Not installed (1210)
0.033µF
±10%,
25V X7R ceramic
capacitor (0603)
Murata GRM188R71E333K
TDK C1608X7R1E333K
10pF
±5%,
50V COG ceramic
capacitor (0603)
Murata GRM1885C1H100J
TDK C1608COG1H100J
0
C2, C3
2
1
C4, C5, C6
3
C7, C8, C9, C14,
C16, C17,
C24–C29
C18
C22
1
0
12
C10
1
C23
1
C11, C31, C32
3
C33
1
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX1518 Evaluation Kit
Evaluates: MAX1518
Component List
DESIGNATION
QTY
DESCRIPTION
3A 30V Schottky diode (M-flat)
Toshiba CMS02
2.2A, 30V Schottky diode
Nihon EC20QS03L
200mA, 100V, dual, ultra-fast
diodes (SOT23)
Central Semiconductor
CMPD6001S (top mark ULS)
Not installed (SOT23)
200mA, 100V, dual, ultra-fast
diode (SOT23)
Central Semiconductor
CMPD6001S (top mark ULS)
2-pin header
3.3µH, 3A inductor
Sumida CDRH6D28-3R3
200mA, 40V pnp bipolar transistor
(SOT23)
Central Semiconductor CMPT3906
(top mark C2A)
Fairchild MMBT3906 (top mark 2A)
DESIGNATION
QTY
DESCRIPTION
200mA, 40V npn bipolar transistor
(SOT23)
Central Semiconductor CMPT3904
(top mark C1A)
Fairchild MMBT3904 (top mark 1A)
95.3kΩ
±1%
resistor (0603)
10.2kΩ
±1%
resistors (0603)
191kΩ
±1%
resistor (0603)
6.8kΩ
±5%
resistors (0603)
332kΩ
±1%
resistor (0603)
40.2kΩ
±1%
resistor (0603)
180kΩ
±5%
resistor (0603)
100kΩ
±5%
resistors (0603)
10Ω
±5%
resistor (0603)
Not installed (short PC trace)
(0603)
MAX1518ETJ (32-pin TQFN
5mm x 5mm)
D1
1
Q2
1
R1
R2, R4
R3
R5, R6
R7
R8
R9
R10–R20
R21
R22–R26
U1
1
2
1
2
1
1
1
11
1
5
1
D2, D3, D4
3
D5
0
JU4
L1
1
1
Q1
1
Component Suppliers
SUPPLIER
Central Semiconductor
Fairchild
Murata
Nihon
Sanyo
Sumida
Taiyo Yuden
TDK
Toshiba
PHONE
516-435-1110
408-822-2000
770-436-1300
661-867-2555
619-661-6322
708-956-0666
800-348-2496
847-390-4373
949-455-2000
FAX
516-435-1824
408-822-2102
770-436-3030
661-867-2698
619-661-1055
708-956-0702
847-925-0899
847-390-4428
949-859-3963
WEBSITE
www.centralsemi.com
www.fairchildsemi.com
www.murata.com
www.niec.co.jp
www.sanyovideo.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.toshiba.com/taec
Note:
Indicate that you are using the MAX1518 when contacting these component suppliers.
Quick Start
The MAX1518 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)
2)
3)
Recommended Equipment
•
•
2
Turn on the power supply and verify that the step-
up regulator output (VMAIN) is +13V.
Verify that the positive linear-regulator output
(VPOS) is +25V.
Verify that the negative linear-regulator output
(VNEG) is -8V.
4.5V to 5.5V, 2A DC power supply
Digital multimeters (DMMs)
_______________________________________________________________________________________
MAX1518 Evaluation Kit
Evaluates: MAX1518
Table
1. Jumper JU1 Functions
SHUNT LOCATION
1-2
2-3
(default)
POSITIVE CHARGE-PUMP
INPUT VOLTAGE
1st stage of a two-stage charge pump
powered by VMAIN
1st stage of a 2-stage charge pump
powered by VIN
Table 2. Jumper JU2 Functions
SHUNT LOCATION
1-2
(default)
1-3
1-4
NEGATIVE CHARGE-PUMP
INPUT VOLTAGE
Charge pump connected to PGND
Charge pump connected to another
charge pump
Charge pump connected to VIN
Detailed Description
The MAX1518 EV kit contains a step-up switching regu-
lator and two linear regulators. It operates from a +4.5V
to +5.5V DC power supply. The switching frequency is
1.2MHz. As configured, the step-up switching regulator
generates a +13V output and can provide up to
650mA. VPOS uses two charge-pump stages to gener-
ate approximately +25V and can provide up to 10mA.
VNEG uses one charge-pump stage to generate
approximately -8V and can provide up to 15mA. The EV
kit includes five high-current operational amplifiers.
Output Voltage Selection
Step-Up Switching-Regulator Output
Voltage (VMAIN)
The MAX1518 EV kit’s step-up switching-regulator output
is set to +13V by feedback resistors R1 and R2. To gen-
erate output voltages other than +13V (+4.7V to +V
MAIN
),
select different external voltage-divider resistors (R1 and
R2). The output capacitors (C4, C5, and C6) are rated at
+16V. To set the output voltage greater than +15V, use
higher-voltage rated capacitors. Refer to the
Output
Voltage Selection
section in the MAX1518 data sheet for
instructions on selecting the feedback resistors.
Jumper Selection
Positive Charge Pump (JU1)
The positive charge pump can be powered by VIN or
VMAIN. Jumper JU1 selects the voltage source for the
positive charge pump.
Table
1 lists the jumper options.
The default configuration for the positive charge pump
of the MAX1518 EV kit is a two-stage charge pump
powered by VIN as indicated in Tables 1 and 2.
Positive Linear-Regulator Output Voltage
(VPOS)
The MAX1518 EV kit’s positive linear-regulator output is
set to +25V by feedback resistors R3 and R4. To gen-
erate output voltages other than +25V (+1.25V to
+28V), select different external voltage-divider resistors
(R3 and R4). Refer to the
Output Voltage Selection
sec-
tion in the MAX1518 data sheet for instructions on
selecting the resistors.
Negative Charge Pump (JU2)
The negative charge pump can be connected to VIN or
PGND. Jumper JU2 selects the voltage source for the
negative charge pump.
Table
2 lists the jumper
options. The default configuration for the negative
charge pump of the MAX1518 EV kit is a one-stage
charge pump connected to PGND.
Negative Linear-Regulator Output Voltage
(VNEG)
The MAX1518 EV kit’s negative linear-regulator output is
set to -8V by feedback resistors R7 and R8. To generate
output voltages other than -8V (0 to -22V), select different
external voltage-divider resistors (R7 and R8). Refer to
the
Output Voltage Selection
section in the MAX1518
data sheet for instructions on selecting the resistors.
_______________________________________________________________________________________
3
MAX1518 Evaluation Kit
Evaluates: MAX1518
VIN
VIN
4.75V
PGND
L1
3.3µH
LX
D1
R1
95.3kΩ
1%
FB
PGND
AGND
23
4
3
R2
10.2kΩ
1%
C33
10pF
R5
6.8kΩ
1
C7
0.1µF
2
Q1
3
25
1
C11
0.22µF
50V
SRC
C30
OPEN
C4
4.7µF
16V
C5
4.7µF
16V
C6
4.7µF
16V
C22
OPEN
VMAIN
13V/650mA
VMAIN
1
JU1
2 1
3
D2
2
VP
LX
C8
0.1µF
C1
100µF
16V
C2
10µF
6.3V
C3
10µF
6.3V
R21
10Ω
22
C14
0.1µF
IN
21
LX
PGND
3
VIN
LX
R9
180kΩ
24
COMP
C12
220pF
C13
OPEN
VIN
VIN
C16
0.10µF
D4 1
DRVP
26
C19
OPEN
JU3
4 JU2
1 2 3 D5 1
1 2 3
3
2
3
C20
2
OPEN
VN1
VN
VNEG
-8V/15mA
PGND
C10 1
0.47µF
25V
C9
0.1µF
3
D3
2
C31
0.22µF
PGND
VPOS
25V/10mA
C17
0.1µF
2
1
Q2
3
FBP
R6
6.8kΩ
28
SRC
DRVN
COM
DRN
32
31
TP4
R3
191kΩ
1%
COM
R4
10.2kΩ
1%
C18
0.47µF
16V
R7
332kΩ
1%
R8
40.2kΩ
1%
C21
OPEN
27
FBN
NEG5
OUT5
2
C15
0.22µF
10V
POSS
19
20
18
R22
SHORT
(PC TRACE)
C32
0.22µF
50V
DRN
PGND
PGND
R11
100kΩ
C25
0.1µF
R12
100kΩ
OUT5
VMAIN
PGND
REF
PGND
U1
MAX1518
29
C23
0.033µF
DEL
NEG4
OUT4
POS4
16
17
15
TP3
R23
SHORT
(PC TRACE)
R13
100kΩ
C26
0.1µF
R14
100kΩ
OUT4
VMAIN
VIN
R26
SHORT
(PC TRACE)
CTL
R10
100kΩ
JU4
30
OUT3
CTL
POS3
13
OUT3
12
C27
0.1µF
TP2
R16
100kΩ
R15
100kΩ
VMAIN
NEG2
OUT2
VMAIN
POS2
14
SUP
NEG1
OUT1
11
9
8
R24
SHORT
(PC TRACE)
OUT2
R17
100kΩ
C28
0.1µF
TP1
VMAIN
R18
100kΩ
10
R25
SHORT
(PC TRACE)
C24
0.1µF
6
5
OUT1
R19
100kΩ
C29
0.1µF
VMAIN
R20
100kΩ
BGND
POS1
7
Figure 1. MAX1518 EV Kit Schematic
4
_______________________________________________________________________________________
MAX1518 Evaluation Kit
Evaluates: MAX1518
Figure 2. MAX1518 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX1518 EV Kit PC Board Layout—Component Side
Figure 4. MAX1518 EV Kit PC Board Layout—Internal Layer 2—
GND Plane
Figure 5. MAX1518 EV Kit PC Board Layout—Internal Layer 3—
Signal/GND Plane
_______________________________________________________________________________________
5
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