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19-2499; Rev 0; 7/02
MAX1999 Evaluation Kit
General Description
The MAX1999 evaluation kit (EV kit) demonstrates the MAX1999's standard application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating system supplies for notebook computers. The MAX1999 EV kit provides dual 5V and 3.3V output voltages from a 7V to 24V battery input range. It delivers up to 5A output current for the 5V output and 5A for the 3.3V output with greater than 90% efficiency. The EV kit operates at 200kHz/300kHz switching frequency (5V/3.3V, respectively) and has superior line-and-loadtransient response. This EV kit is a fully assembled and tested circuit board. It allows the evaluation of other output voltages in the 2V to 5.5V range by changing feedback resistors R1-R4. This EV kit can also be used to evaluate the MAX1777 (200kHz/5.0V SMPS and 300kHz/3.3V SMPS) and the MAX1977 (400kHz/5.0V SMPS and 500kHz/3.3V SMPS). o 7V to 24V Input Voltage Range o 3.3V and 5V Output Voltages o 2V to 5.5V Adjustable Outputs (External Resistors) o 5A Output Current (3.3V Output) o 5A Output Current (5V Output) o No Current-Sense Resistor Needed (MAX1999) o Accurate Current Sense with Current-Sense Resistor (MAX1777/MAX1977) o 200kHz/300kHz Switching Frequency (5V/3.3V, Respectively) o Power-Good (PGOOD) Output o Fault Protection Enable/Disable o 28-Pin QSOP Package o Low-Profile Components o Fully Assembled and Tested
Features
Evaluates: MAX1777/MAX1977/MAX1999
Ordering Information
PART MAX1999EVKIT TEMP RANGE 0oC to +70oC IC PACKAGE 28 QSOP
Note: To evaluate the MAX1777/MAX1977, request a MAX1777EEI/MAX1977EEI free sample with the MAX1999EVKIT.
Component List
DESIGNATION QTY C1, C2, C3 C4 C5, C7 C6 3 0 0 1 DESCRIPTION 10F, 25V ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM or TDK C4532X5R1E106M Not installed (1812) Not installed, D case 470F, 4V, 40m, low-ESR capacitor, D case Sanyo 4TPB470M 330F, 6.3V, 40m, low-ESR capacitor, D case Sanyo 6TPB330M 0.1F ceramic capacitors (0805) 1F, 10V X5R ceramic capacitors (0805) Taiyo Yuden LMK212BJ105KG or TDK C2012X5R105M C17 1 DESIGNATION QTY C13, C14 C16 0 1 DESCRIPTION Not installed 0.22F, 16V X5R ceramic capacitor (0805) Taiyo Yuden EMK212BJ224KG 4.7F, 35V tantalum capacitor, C case Sprague 595D475X0035C2B 4.7F, 16V tantalum capacitors, A case Sprague 595D475X0016A2B 100mA, 30V dual Schottky diode Central Semiconductor CMPSH-3A 1A, 30V Schottky diodes Nihon EP10QY03 Toshiba CRS02 3-pin headers 4-pin headers
C18, C19
2
C8 C9, C10, C12, C15
1
D1
1
4
D2, D3 JU1, JU2 JU3, JU5
2 2 2
C11, C24
2
________________________________________________________________ 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.
MAX1999 Evaluation Kit Evaluates: MAX1777/MAX1977/MAX1999
Component List (continued)
DESIGNATION QTY L1 L2 1 1 DESCRIPTION 7.6H, 5.9A power inductor Sumida CDRH127-7R6 4.7H, 5.7A power inductor Sumida CDRH124-4R7 N-channel MOSFET, 8-pin SO International Rectifier IRF7807V or Fairchild FDS6612A N-channel MOSFET, 8-pin SO International Rectifier IRF7811AV or Fairchild FDS6670A Not installed (0805) Not installed, short PC trace (0805) 3.9 5% resistor (1206) DESIGNATION QTY R6 R7, R9 R8, R18 R15, R16 R17 U1 None None None None None 1 2 2 0 1 1 4 4 1 1 1 DESCRIPTION 100k 5% resistor (0805) 1M 5% resistors (0805) 10 5% resistors (0805) Not installed, short PC trace (2010) 47 5% resistor (0805) MAX1999EEI, 28-pin QSOP Shunts (JU1, JU2, JU3, JU5) Rubber feet MAX1999 PC board MAX1999 data sheet MAX1999 EV kit data sheet
N1, N3
2
N2, N4 R1, R3, R10-R14 R2, R4 R5
2
0 0 1
Component Suppliers
SUPPLIER Central Semiconductor Fairchild International Rectifier Nihon Sanyo Sprague/Vishay Sumida Taiyo Yuden TDK PHONE 516-435-1110 408-721-2181 310-322-3331 847-843-7500 619-661-6835 270-324-4140 708-956-0666 408-573-4150 847-390-4373 FAX 516-435-1824 408-721-1635 310-322-3332 847-843-2798 619-661-1055 270-490-7222 708-956-0702 408-573-4159 847-390-4428 WEBSITE www.centralsemi.com www.fairchildsemi.com www.irf.com www.niec.co.jp www.sumida.com www.vishay.com www.sumida.com www.t-yuden.com www.component.tdk.com
Note: Please indicate that you are using the MAX1999 when contacting these component suppliers.
Recommended Equipment
* * * * 7V to 24V power supply, battery, or notebook AC adapter Dummy loads capable of sinking 5A Digital multimeters (DMMs) 100MHz dual-trace oscilloscope
2) Verify that the shunts are across JU1 pins 1 and 2, JU2 pins 1 and 2, JU3 pins 1 and 4, and JU5 pins 1 and 4. 3) Turn on the power supply. 4) Verify that the output voltages are 3.3V and 5V.
Evaluating Other Output Voltages
Quick Start
1) Ensure that the circuit is connected correctly to the supplies and dummy load before applying any power.
The EV kit outputs are preset to 3.3V and 5V. However, the output voltages can also be adjusted between 2V and 5.5V by selecting R1/R2 and R3/R4 values. Select feedback resistors R2 and R4. R1 and R3 are then given by: R1 (or R3) = R2 (or R4) x [(VOUT/VFB) - 1] where VFB = 2V.
2
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MAX1999 Evaluation Kit Evaluates: MAX1777/MAX1977/MAX1999
VCC VIN 7V TO 24V VCC REF R5 3.9 GND R12 OPEN JU8 R13 OPEN VCC JU7
R11 OPEN
R14 OPEN
V+
LD05 +5V
C1 10F 25V
C2 10F 25V
8 7 N1 3 2
5 6 4 1 BST5
C17 4.7F 35V
C15 0.1F
20 8 V+
5 ILIM3
11 ILIM5
18 LDO5 VCC 17
R17 VCC 47
3
D1
C11 1F 10V L
C18 4.7F 16V
16 14 C9 0.1F R8 10 C13* OPEN
DH5 BST5
C24 1F 10V
U1
VOUT2 +5V, 5A
L1 7.6H
15
LX5
MAX1999 (MAX1777) (MAX1977)
BST3 DH3 LX3
28 26 27
R18 10
2
R
1
BST5
5 6 4
8 7 N3 3 2
C3 10F 25V
C4 OPEN
C10 0.1F C14* OPEN
1
L2 4.7H
VOUT1 3.3V, 5A
C8 330F 6.3V
C7 OPEN
D3
8 7 N2 3 2 1
5 6 4
19 13
DL5 TON (CS5) DL3 N.C. (CS3) 24 1 4
5
6
7
8
D2
C5 OPEN
C6 470F 4V
R3 OPEN
VCC R16 SHORT (PC TRACE) 4 REF 3 2
R10 OPEN JU6 R7 1M
N4 3 1 2 R15 SHORT (PC TRACE) R1 OPEN
JU5 1 5V ON/OFF
4
ON5 OUT3 FB3
22 7 VCC
21 9
OUT5 FB5 R6 100k VCC PGOOD 2 12 23 VCC PGOOD 1 2 JU2 3
R2 SHORT (PC TRACE)
R4 SHORT (PC TRACE)
VCC
3.3V ON/OFF
4 REF 3 2 V+ SHDN 1 2 3 JU3 1 3 ON3
SKIP GND
JU4 JU1 6 10 R9 1M LD03 3.3V C16 0.22F C12 0.1F C19 4.7F 16V *OPTIONAL C13 AND C14 REQUIRED FOR ULTRASONIC MODE OPERATION (MAX1999 ONLY). SEE TABLE 2.
SHDN REF 8 LD03 25
PRO
REF 2V
Figure 1. MAX1999 EV Kit Schematic
Evaluating the MAX1777/MAX1977
This EV kit also can be used to evaluate the MAX1777/ MAX1977. The MAX1777 operates at 200kHz/300kHz switching frequency and the MAX1977 operates at 400kHz/500kHz switching frequency (5V/3.3V). The MAX1777 and the MAX1977 use accurate currentsense resistors, R15 and R16:
1) Remove the MAX1999 and install a MAX1777 or MAX1977. 2) Cut open the traces shorting sense resistors R15 and R16. 3) Install sense resistors R15 and R16. 4) Short resistor R10 (leave JU6 open).
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MAX1999 Evaluation Kit Evaluates: MAX1777/MAX1977/MAX1999
Jumper Settings
Table 1. Jumper JU1 Functions (SHDN Mode Selection)
JU1 1 and 2 SHDN PIN Connected to V+ MAX1999 OUTPUT MAX1999 enabled; REF, LDO3, and LDO5 active; VOUT1 (3.3V) depends on JU3; VOUT2 (5.0V) depends on JU5 Shutdown mode; REF, LDO3, and LDO5 off; VOUT1 = 0V and VOUT2 = 0V MAX1999 can be driven by an external signal
2 and 3 Not installed
Connected to GND Connected to SHDN pad
Table 2. Jumper JU2 Functions (SKIP Mode Selection)
JU2 1 and 2 2 and 3 SKIP PIN Connected to VCC Connected to GND OPERATING MODE Low-noise mode, forced fixed-frequency PWM operation. Normal operation, allows automatic PWM/PFM switchover for pulse-skipping at light load, resulting in highest efficiency. Ultrasonic pulse-skipping mode (20kHz min). Install C13, C14 (470pF) for MAX1999 ultrasonic mode operation to ensure proper negative ultrasonic current sensing (VNEG(s)).
Not installed
Floating
Table 3. Jumper JU3 Functions (Output Voltage VOUT1 Control)
JU3 1 and 2 1 and 3 1 and 4 ON3 PIN Connected to GND Connected to REF (ON5 = VCC) Connected to VCC OUTPUT VOLTAGE (VOUT1) VOUT1 = 0V, disabled VOUT1 (3.3V) starts after VOUT2 (5V) reaches regulation VOUT1 = 3.3V, enabled
Table 4. Jumper JU4 Functions (Protection Selection)
JU4 Installed PRO PIN Connected to VCC Connected to GND through resistor R9 PROTECTION Undervoltage and overvoltage fault protection are disabled. Undervoltage and overvoltage fault protection are enabled. Refer to the Fault Protection section in the MAX1999 data sheet for more information.
Not installed
4
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MAX1999 Evaluation Kit
Jumper Settings (continued)
Table 5. Jumper JU5 Functions (Output Voltage VOUT2 Control)
JU5 1 and 2 1 and 3 1 and 4 ON5 PIN Connected to GND Connected to REF (ON3 = VCC) Connected to VCC OUTPUT VOLTAGE (VOUT2) VOUT2 = 0V, disabled VOUT2 (5V) starts after VOUT1 (3.3V) reaches regulation VOUT2 = 5V, enabled
Evaluates: MAX1777/MAX1977/MAX1999
Table 6. Jumper JU6 Functions (Switching-Frequency Selection)
JU6 Not installed Installed TON PIN Connected to VCC through resistor R7 Connected to GND FREQUENCY (kHz) 200/300 (as shipped) 400/500
Important: Do not change the operating frequency without first recalculating component values. The switching frequency has a significant effect on the peak current-limit level, MOSFET heating, preferred inductor value, PFM/PWM switchover point, output noise, efficiency, and other critical parameters.
Table 7. Jumper JU7 Functions (Fixed/Adjustable Current-Limit Selection for VOUT2)
JU7 SHORT ILIM5 PIN Connected to VCC through a PC board trace. Connected to REF through resistor-divider R13/R14. Refer to the Current-Limit Circuit section in the MAX1999 data sheet for information on selecting R13/R14. CURRENT-LIMIT THRESHOLD (mV) 100 (default)
OPEN
Adjustable from 50 to 200
Table 8. Jumper JU8 Functions (Fixed/Adjustable Current-Limit Selection for VOUT1)
JU8 SHORT ILIM3 PIN Connected to VCC through a PC board trace. Connected to REF through resistor-divider R11/R12. Refer to the Current-Limit Circuit section in the MAX1999 data sheet for information on selecting R11/R12. CURRENT-LIMIT THRESHOLD (mV) 100 (default)
OPEN
Adjustable from 50 to 200
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5
MAX1999 Evaluation Kit Evaluates: MAX1777/MAX1977/MAX1999
Figure 2. MAX1999 EV Kit Component Placement Guide-- Top Silkscreen
Figure 3. MAX1999 EV Kit PC Board Layout--Component Side
6
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MAX1999 Evaluation Kit Evaluates: MAX1777/MAX1977/MAX1999
Figure 4. MAX1999 EV Kit PC Board Layout--Ground Layer 2
Figure 5. MAX1999 EV Kit PC Board Layout--Ground Layer 3
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MAX1999 Evaluation Kit Evaluates: MAX1777/MAX1977/MAX1999
Figure 6. MAX1999 EV Kit PC Board Layout--Solder Side
Figure 7. MAX1999 EV Kit Component Placement Guide-- Bottom Silkscreen
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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