MAX1518EVKIT

19-3456; Rev 0; 10/04
MAX1518 Evaluation Kit
Features
♦ +4.5V to +5.5V Input Range
The positive linear regulator is configured for a +25V
output (VPOS) using two charge-pump stages providing up to 10mA. The negative linear regulator is configured for a -8V output (VNEG) using a single chargepump stage providing up to 15mA. The DC input
source or the step-up switching regulator output provides 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 current and high efficiency for maximum battery life.
Operation at 1.2MHz allows the use of tiny surfacemount components.
♦ 1.2MHz Switching Frequency
♦ Output Voltages
♦ +13V Output at 650mA (VMAIN)
♦ +25V Output at 10mA (VPOS)
♦ -8V Output at 15mA (VNEG)
♦ Adjustable Output Voltages (External Resistors)
♦ Five High-Performance Operational Amplifiers
♦ Low-Profile Surface-Mount Components
♦ Fully Assembled and Tested
Ordering Information
PART
TEMP RANGE
MAX1518EVKIT
0°C to +70°C
IC PACKAGE
32 TQFN
5mm x 5mm
Component List
DESIGNATION
C1
C2, C3
C4, C5, C6
QTY
DESCRIPTION
QTY
DESCRIPTION
C12
1
220pF ±10%, 50V C0G ceramic
capacitor (0603)
TDK C1608C0G1H221K
1
100µF ±20%, 16V aluminum
electrolytic capacitor
Sanyo 16MV100UAX
C13, C19, C20,
C21, C30
0
Not installed (0603)
2
10µF ±20%, 6.3V X5R ceramic
capacitors (1206)
TDK C3216X5R0J106M-0.85
4.7µF ±20%, 16V X5R ceramic
capacitors (1210)
TDK C3225X5R1C475M-1.15
C15
1
0.22µF ±10%, 10V X7R ceramic
capacitor (0603)
Taiyo Yuden LMK107BJ224KA
0.1µF ±10%, 50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H104K
C18
1
0.47µF ±10%, 16V X7R ceramic
capacitor (0805)
TDK C2012X7R1C474K-0.60
C22
0
Not installed (1210)
1
0.033µF ±10%, 25V X7R ceramic
capacitor (0603)
Murata GRM188R71E333K
TDK C1608X7R1E333K
1
10pF ±5%, 50V COG ceramic
capacitor (0603)
Murata GRM1885C1H100J
TDK C1608COG1H100J
3
C7, C8, C9, C14,
C16, C17,
C24–C29
12
C10
1
0.47µF ±10%, 25V X5R ceramic
capacitor (1206)
TDK C3216X5R1E474KT-0.90
3
0.22µF, 50V X7R ceramic
capacitors (0805)
Taiyo Yuden UMK212BJ224MG
TDK C2012X7R1H224M
C11, C31, C32
DESIGNATION
C23
C33
________________________________________________________________ Maxim Integrated Products
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.
1
Evaluates: MAX1518
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 negative charge pump postregulated by a high-voltage
negative linear regulator, and five high-current operational amplifiers. The step-up switching circuit is configured for a +13V output (VMAIN) and provides up to
650mA from a +4.5V to +5.5V DC supply voltage.
MAX1518 Evaluation Kit
Evaluates: MAX1518
Component List
DESIGNATION
QTY
D1
D2, D3, D4
D5
DESCRIPTION
1
3A 30V Schottky diode (M-flat)
Toshiba CMS02
2.2A, 30V Schottky diode
Nihon EC20QS03L
3
200mA, 100V, dual, ultra-fast
diodes (SOT23)
Central Semiconductor
CMPD6001S (top mark ULS)
0
Not installed (SOT23)
200mA, 100V, dual, ultra-fast
diode (SOT23)
Central Semiconductor
CMPD6001S (top mark ULS)
2-pin header
JU4
1
L1
1
3.3µH, 3A inductor
Sumida CDRH6D28-3R3
1
200mA, 40V pnp bipolar transistor
(SOT23)
Central Semiconductor CMPT3906
(top mark C2A)
Fairchild MMBT3906 (top mark 2A)
Q1
DESIGNATION
QTY
DESCRIPTION
R1
1
200mA, 40V npn bipolar transistor
(SOT23)
Central Semiconductor CMPT3904
(top mark C1A)
Fairchild MMBT3904 (top mark 1A)
95.3kΩ ±1% resistor (0603)
R2, R4
2
10.2kΩ ±1% resistors (0603)
191kΩ ±1% resistor (0603)
Q2
1
R3
1
R5, R6
2
6.8kΩ ±5% resistors (0603)
R7
1
332kΩ ±1% resistor (0603)
R8
1
40.2kΩ ±1% resistor (0603)
R9
1
180kΩ ±5% resistor (0603)
R10–R20
11
100kΩ ±5% resistors (0603)
R21
1
10Ω ±5% resistor (0603)
R22–R26
5
Not installed (short PC trace)
(0603)
U1
1
MAX1518ETJ (32-pin TQFN
5mm x 5mm)
Component Suppliers
PHONE
FAX
Central Semiconductor
SUPPLIER
516-435-1110
516-435-1824
www.centralsemi.com
WEBSITE
Fairchild
408-822-2000
408-822-2102
www.fairchildsemi.com
Murata
770-436-1300
770-436-3030
www.murata.com
Nihon
661-867-2555
661-867-2698
www.niec.co.jp
Sanyo
619-661-6322
619-661-1055
www.sanyovideo.com
Sumida
708-956-0666
708-956-0702
www.sumida.com
Taiyo Yuden
800-348-2496
847-925-0899
www.t-yuden.com
TDK
847-390-4373
847-390-4428
www.component.tdk.com
Toshiba
949-455-2000
949-859-3963
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.
Recommended Equipment
•
•
2
1)
2)
3)
Turn on the power supply and verify that the stepup 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
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
Detailed Description
The MAX1518 EV kit contains a step-up switching regulator 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 generate 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.
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.
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.
Table 2. Jumper JU2 Functions
SHUNT LOCATION
NEGATIVE CHARGE-PUMP
INPUT VOLTAGE
1-2
(default)
Charge pump connected to PGND
1-3
Charge pump connected to another
charge pump
1-4
Charge pump connected to VIN
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 generate output voltages other than +13V (+4.7V to +VMAIN),
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.
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 generate output voltages other than +25V (+1.25V to
+28V), select different external voltage-divider resistors
(R3 and R4). Refer to the Output Voltage Selection section in the MAX1518 data sheet for instructions on
selecting the resistors.
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
Evaluates: MAX1518
Table 1. Jumper JU1 Functions
Evaluates: MAX1518
MAX1518 Evaluation Kit
VIN
VIN
4.75V
C1
100µF
16V
PGND
C3
10µF
6.3V
C2
10µF
6.3V
R21
10Ω
IN
FB
PGND
R9
180kΩ
AGND
24
VIN
C19
OPEN
JU3
4 JU2
1 2 3 D5 1
1 2 3
3
2
3
C20
2
OPEN
DRVP
FBP
C17
0.1µF
R6
6.8kΩ
2
28
1
VN
SRC
DRVN
COM
Q2
3
C18
0.47µF
16V
PGND
DRN
C6
4.7µF
16V
C22
OPEN
27
NEG5
FBN
OUT5
2
POSS
REF
C15
0.22µF
10V
4
R2
10.2kΩ
1%
3
3
C7
0.1µF
29
DEL
NEG4
OUT4
JU4
30
CTL
OUT3
POS3
19
POS2
14
R22
SHORT
(PC TRACE)
11
BGND
POS1
16
C31
0.22µF
PGND
PGND
OUT4
R13
100kΩ
15
C26
0.1µF
VMAIN
R14
100kΩ
13
OUT3
R15
100kΩ
12
9
R24
SHORT
(PC TRACE)
VMAIN
R16
100kΩ
8
OUT2
R17
100kΩ
10
6
5
R25
TP1 SHORT
(PC TRACE)
VMAIN
R18
100kΩ
OUT1
R19
100kΩ
7
PGND
VMAIN
R12
100kΩ
17
C29
0.1µF
VMAIN
R20
100kΩ
Figure 1. MAX1518 EV Kit Schematic
4
VPOS
25V/10mA
PGND
OUT5
R23
SHORT
(PC TRACE)
C28
0.1µF
NEG1
OUT1
D3
2
R4
10.2kΩ
1%
DRN
C32
0.22µF
50V
R11
100kΩ
18
SUP
C24
0.1µF
C9
0.1µF
20
TP2
VMAIN
LX
3
R3
191kΩ
1%
31
C27
0.1µF
NEG2
OUT2
C10 1
0.47µF
25V
SRC
CTL
R10
100kΩ
VP
COM
TP3
POS4
VIN
R26
SHORT
(PC TRACE)
C30
OPEN
32
D2
2
25
C11
0.22µF
50V
C8
0.1µF
3
2
Q1
1
JU1
2 1
VIN
26
U1
C23
0.033µF
1
PGND
C33
10pF
R5
6.8kΩ
1
C25
0.1µF
MAX1518
VMAIN
23
TP4
C21
OPEN
R7
332kΩ
1%
R8
40.2kΩ
1%
PGND
C5
4.7µF
16V
3
VN1
VNEG
-8V/15mA
C4
4.7µF
16V
COMP
C13
OPEN
C12
220pF
C16
0.10µF
D4 1
R1
95.3kΩ
1%
LX
C14
0.1µF
VIN
D1
21
22
LX
VMAIN
13V/650mA
LX
L1
3.3µH
_______________________________________________________________________________________
MAX1518 Evaluation Kit
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
Evaluates: MAX1518
Figure 2. MAX1518 EV Kit Component Placement Guide—
Component Side
Evaluates: MAX1518
MAX1518 Evaluation Kit
Figure 6. MAX1518 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.
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© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.