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19-2871; Rev 0; 5/03
MAX1536 Evaluation Kit
General Description
The MAX1536 evaluation kit (EV kit) provides dynamically adjustable 1.5V/1.8V output voltages from a 3.0V to 5.5V input voltage source. It delivers up to 3.6A output current with up to 93% efficiency. The MAX1536 EV kit includes the MAX1536 step-down switching regulator with an internal synchronous rectifier to increase efficiency and reduce the number of external components. The resistor-programmable fixedoff-time, current-mode architecture allows an optimum response to load-and-line transients. This EV kit, as configured, operates at approximately 570kHz and is optimized for 3.3V input and 1.8V output. The EV kit is a fully assembled and tested circuit board. It also allows the evaluation of other output voltages in the 0.7V to VIN range. o 3.0V to 5.5V Input Voltage Range o Dynamically Selectable 1.5V/1.8V Output Voltage o Adjustable Output Voltage from 0.7V to VIN o Up to 3.6A Output Current o Up to 1.4MHz Switching Frequency o <0.2A (typ) IC Shutdown Supply Current o No External Schottky Diode Required o Power-Good Output o Surface-Mount Construction o Fully Assembled and Tested
Features
Evaluates: MAX1536
Ordering Information
PART TEMP RANGE IC PACKAGE
MAX1536EVKIT 0C to +70C 28 Thin QFN 5mm x 5mm-EP*
*EP = Exposed paddle.
Component List
DESIGNATION QTY DESCRIPTION 10F 20%, 6.3V X5R ceramic capacitors (1206) TDK C3216X5RDJ106M or Taiyo Yuden JMK316BJ106ML 100F 20%, 6.3V, 18m-ESR POSCAP capacitor (D2E) Sanyo 6TPE100MI 470pF 10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H471K or equivalent 2.2F 10%, 6.3V X5R ceramic capacitor (0603) TDK C1608X5R0J225K 0.22F 20%, 10V X7R ceramic capacitor (0603) Taiyo Yuden LMK107BJ224MA 1F 20%, 6.3V X5R ceramic capacitor (0603) Taiyo Yuden JMK107BJ105MA Not installed, Schottky diode DESIGNATION QTY JU1, JU2, JU3 JU4 3 1 DESCRIPTION 3-pin headers 4-pin header 1.2H inductor Sumida CDR7D28MN-1R2 or 1.0H inductor Sumida CDRH8D28-1R0NC 10 5% resistor (0603) 100k 5% resistor (0603) 75k 1% resistor (0603) Not installed, resistor (0603) (shorted by PC trace) Not installed, resistor (0603) 20k 1% resistor (0603) 90.9k 1% resistor (0603) 182k 1% resistor (0603) MAX1536ETI (28-pin thin QFN 5mm x 5mm) Shunts MAX1536 PC board
C1, C2
2
L1 C3 1
1
R1 R2 R3 R4
1 1 1 0 0 1 1 1 1 4 1
C4, C7
2
C5
1
R5, R8 R6 R7 R9 U1
C6
1
C8 D1
1 0
None None
________________________________________________________________ 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.
MAX1536 Evaluation Kit Evaluates: MAX1536
Component Suppliers
SUPPLIER Sanyo Sumida Taiyo Yuden TDK PHONE 619-661-6322 847-545-6700 800-348-2496 847-803-6100 FAX 619-661-1055 847-545-6720 847-925-0899 847-390-4405 WEBSITE www.sanyo.com www.sumida.com www.t-yuden.com www.component.tdk.com
Note: Please indicate that you are using the MAX1536 when contacting these component suppliers.
Quick Start
The MAX1536 EV kit is a fully assembled and tested surface-mount board. Follow the steps below for proper board operation. Do not turn on the power supply until all connections are completed: 1) Connect a voltmeter and load (if any) from VOUT to GND. 2) Verify that the shunts are across JU1 (SHDN) pins 1 and 2, JU2 (SKIP) pins 1 and 2, JU3 (GATE) pins 2 and 3, and JU4 (FBLANK) pins 1 and 2. 3) Connect a 3.0V to 5.5V supply to the pads marked VIN and GND. 4) Turn on the power supply and verify that the output voltage is 1.8V. See the Evaluating Other Output Voltages section for different output voltages.
Table 1. Jumper JU1 Functions (SHDN)
SHUNT LOCATION 1 and 2 (default) 2 and 3 Not installed SHDN PIN Connected to VCC Connected to GND SHDN must be driven by an external signal MAX1536 OUTPUT MAX1536 enabled, VOUT = 1.8V MAX1536 disabled MAX1536 output depends on external SHDN signal levels
Table 2. Jumper JU2 Functions (SKIP)
SHUNT LOCATION 1 and 2 (default) SKIP PIN Connected to VCC MODE OF OPERATION Constant-off-time forced-PWM mode Automatic PWM/PFM mode, high-efficiency idle mode under light loads, and PWM mode under heavy loads
Detailed Description
Jumper Selection
In shutdown mode, the MAX1536 reduces the supply current to 0.2A (typ). Jumper JU1 controls the MAX1536's shutdown function. Table 1 lists jumper JU1 functions. The MAX1536 has two modes of operation: low-noise, constant-off-time, forced-PWM mode and automatic PWM/PFM mode. Jumper JU2 controls the MAX1536's operation function. Table 2 lists jumper JU2 functions. The MAX1536 EV kit is preset to a dynamically selectable 1.5V/1.8V output. The EV kit incorporates jumper JU3 to control the dynamic outputs. Table 3 lists jumper JU3 functions. Jumper JU4 controls the fault blanking control input (FBLANK). The FBLANK input determines how long the MAX1536 maintains forced-PWM operation and forces PGOOD high impedance when a transition is detected on the GATE pin. Table 4 lists jumper JU4 functions.
2 and 3
Connected to GND
Table 3. Jumper JU3 Functions (GATE)
SHUNT LOCATION 1 and 2 2 and 3 (default) Not installed GATE PIN Connected to VCC Connected to GND GATE must be driven by an external signal MAX1536 OUTPUT VOUT = 1.5V VOUT = 1.8V VOUT depends on external GATE signal levels
2
_______________________________________________________________________________________
MAX1536 Evaluation Kit
Table 4. Jumper JU4 Functions (FBLANK)
SHUNT LOCATION 1 and 2 (default) 1 and 3 1 and 4 Not installed FBLANK PIN Connected to REF Connected to GND Connected to VCC Open FAULTBLANKING FUNCTION Enabled Disabled Enabled Enabled TYPICAL FORCED-PWM TIME (s) 50 100 150 100
* To evaluate output voltages greater than 2V, change resistors R6, R7, and R9, cut the trace shorting R4, and install feedback resistors R4 and R5. Select R5 and R9 in the 10k to 100k range, and use the following equations to calculate R4: VOUT(HIGH) = VFB (HIGH) [(R4 + R5) / R5]VO VOUT(LOW) = VFB (LOW) [(R4 + R5) / R5] where VFB(HIGH) and VFB(LOW) are calculated from equations (1) and (2), respectively.
Evaluates: MAX1536
Evaluating Fixed Output Voltages
The MAX1536 EV kit can also be used to evaluate fixed output voltages. For fixed output voltage applications, OD and OD are not used, and GATE should be connected to GND. Remove R7 and R8. Verify that the shunt is across jumper JU3 pins 2 and 3: * To evaluate output voltages from 0.7V to 2V, change resistors R6 and R9. Select R9 in the 10k to 100k range. Calculate R6 using equation 1. If VOUT equals 2V, short R6 and remove R9: * To evaluate output voltages from 2V to VIN, short R6, remove R9, and install feedback resistors R4 and R5. Select R5 in the 10k to 100k range: VOUT = VFB[(R4 + R5)/R5] where VFB = VREF = 2V. For other output voltages, refer to the MAX1536 IC data sheet to recalculate the inductor and output capacitor.
Evaluating Other Output Voltages
Evaluating Dynamic Output Voltages
The MAX1536 EV kit is preset to 1.5V/1.8V. When GATE is high (JU3, 1-2), VOUT = 1.5V. When GATE is low (JU3, 2-3), VOUT = 1.8V. * To evaluate output voltages from 0.7V to 2V, change resistors R6 and R9. Select R9 in the 10k to 100k range, then use equations 1 and 2 to calculate R6 and R7: VOUT(HIGH) = VFB(HIGH) = VREF [R9 / (R6 + R9)] (Eq 1) where VREF = 2V. VOUT(LOW) = VFB(LOW) = VREF [(R7//R9) / (R6 + R7//R9)] (Eq 2)
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3
Evaluates: MAX1536
VCC C4 470pF 7 COMP 2 IN IN LX IN LX IN N.C. 16 VCC FB 6 25 26 GND R4 OPEN (SHORTED BY PC TRACE) 24 D1 OPEN LX 21 C8 1F C3 100F 6.3V LX C1 10F 6.3V C2 10F 6.3V 3 R1 10 VCC 20 19 1 TOFF L1 1.2H VOUT 1.8V/5.5V 9 R3 75k 1%
MAX1536 Evaluation Kit
Figure 1. MAX1536 EV Kit Schematic
U1 MAX1536
18 PGOOD AGND VCC JU1 1 2 4 SHDN 2 REF JU2 1 2 5 SKIP R7 90.9k 1% JU3 1 2 10 GATE N.C. PGND PGND 22 23 PGND PGND 27 28 OD 12 8 3 OD 11 R8 OPEN REFIN 3 13 14 R6 20k 1% C7 470pF FBLANK 17 3 4 JU4 3 1 C6 0.22F VCC 15 R5 OPEN C5 2.2F R2 100k VCC VCC R9 182k 1%
4
VIN 3.0V TO 5.5V
GND
PGOOD
SHDN
SKIP
_______________________________________________________________________________________
GATE
MAX1536 Evaluation Kit Evaluates: MAX1536
Figure 2. MAX1536 EV Kit Component Placement Guide--Top Silkscreen
Figure 3. MAX1536 EV Kit PC Board Layout--Component Side
Figure 4. MAX1536 EV Kit PC Board Layout--Layer 2 (PGND and AGND)
Figure 5. MAX1536 EV Kit PC Board Layout--Layer 3 (AGND) 5
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MAX1536 Evaluation Kit Evaluates: MAX1536
Figure 6. MAX1536 EV Kit PC Board Layout--Solder Side (AGND)
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) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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