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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 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. 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. 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 0C to +70C IC PACKAGE 32 TQFN 5mm x 5mm
Component List
DESIGNATION C1 QTY 1 DESCRIPTION 100F 20%, 16V aluminum electrolytic capacitor Sanyo 16MV100UAX 10F 20%, 6.3V X5R ceramic capacitors (1206) TDK C3216X5R0J106M-0.85 4.7F 20%, 16V X5R ceramic capacitors (1210) TDK C3225X5R1C475M-1.15 0.1F 10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H104K 0.47F 10%, 25V X5R ceramic capacitor (1206) TDK C3216X5R1E474KT-0.90 0.22F, 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) 0.22F 10%, 10V X7R ceramic capacitor (0603) Taiyo Yuden LMK107BJ224KA 0.47F 10%, 16V X7R ceramic capacitor (0805) TDK C2012X7R1C474K-0.60 Not installed (1210) 0.033F 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 3.3H, 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) 95.3k 1% resistor (0603) 10.2k 1% resistors (0603) 191k 1% resistor (0603) 6.8k 5% resistors (0603) 332k 1% resistor (0603) 40.2k 1% resistor (0603) 180k 5% resistor (0603) 100k 5% resistors (0603) 10 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 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)
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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 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.
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.
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 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 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.
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3
MAX1518 Evaluation Kit Evaluates: MAX1518
VIN VIN 4.75V PGND
L1 3.3H
LX D1 R1 95.3k 1% FB PGND AGND 23 4 3 R2 10.2k 1% C33 10pF R5 6.8k 1 C7 0.1F 2 Q1 3 25 1 C11 0.22F 50V SRC C30 OPEN C4 4.7F 16V C5 4.7F 16V C6 4.7F 16V C22 OPEN
VMAIN 13V/650mA
VMAIN 1 JU1 21 3 D2 2 VP LX C8 0.1F
C1 100F 16V
C2 10F 6.3V
C3 10F 6.3V
R21 10 22 C14 0.1F IN
21 LX
PGND 3 VIN
LX
R9 180k 24 COMP C12 220pF C13 OPEN
VIN C19 OPEN JU3 4 JU2 1 2 3 D5 1 1 23 3 2 3 C20 2 OPEN VIN VN1 VN VNEG -8V/15mA PGND
DRVP
26
C16 0.10F D4 1
C10 1 0.47F 25V
C9 0.1F 3 D3 2 C31 0.22F PGND VPOS 25V/10mA
C17 0.1F 2 1 Q2 3
FBP R6 6.8k 28 SRC
DRVN
COM DRN
32 31 TP4
R3 191k 1% COM R4 10.2k 1%
C18 0.47F 16V
R7 332k 1% R8 40.2k 1%
C21 OPEN 27 FBN NEG5 OUT5 2 C15 0.22F 10V POSS
19 20 18
R22 SHORT (PC TRACE)
C32 0.22F 50V
DRN
PGND
PGND
R11 100k C25 0.1F R12 100k
OUT5 VMAIN
PGND
REF
PGND
U1 MAX1518
29 C23 0.033F DEL NEG4 OUT4 POS4 16 17 15
TP3
R23 SHORT (PC TRACE) R13 100k C26 0.1F R14 100k OUT4 VMAIN
VIN R26 SHORT (PC TRACE) CTL R10 100k
JU4 30 OUT3 CTL POS3
13 OUT3 12 C27 0.1F TP2 R16 100k R15 100k VMAIN
NEG2 OUT2 VMAIN POS2 14 SUP NEG1 OUT1 11
9 8
R24 SHORT (PC TRACE)
OUT2 R17 100k C28 0.1F VMAIN R18 100k
10 R25 TP1 SHORT (PC TRACE)
C24 0.1F
6 5
OUT1 R19 100k C29 0.1F VMAIN R20 100k
BGND
POS1
7
Figure 1. MAX1518 EV Kit Schematic
4
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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
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5
MAX1518 Evaluation Kit Evaluates: MAX1518
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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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