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Part: MAX1889EVKIT
Category:
Power Management
-> Battery Management
Description: MAX1889EVKIT Evaluation Kit For The MAX1889
Company: Maxim Integrated Products
Datasheet: Download MAX1889EVKIT datasheet File size : 505 kB
Request For quote: Find where to buy MAX1889EVKIT
Datasheet text preview:
19-2518; Rev 2; 9/02
MAX1889 Evaluation Kit
General Description
The MAX1889 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a s t e p - u p switching regulator, a positive three-stage charge-pump and high-voltage positive linear-regulator controller, and a negative three-stage charge-pump and high-voltage negative linear-regulator controller. The step-up switching circuit is configured for a 9V output and provides up to 200mA from a DC supply voltage of 2.7V to 5.5V. The positive charge-pump and linear regulator are configured for a 20V output using two charge-pump stages providing up to 10mA. The negative charge pump and linear regulator are configured for a -7V output using a single charge-pump stage providing up to 10mA. Power for the positive charge-pump input can be provided by the DC input source or the step-up switching regulator output. Power for the negative charge-pump input can be provided by the DC input source or the power ground. The MAX1889 EV kit demonstrates low quiescent current and high efficiency (up to 90%) for maximum battery life. The EV kit features overload protection for the input and all outputs. Operation at 1MHz allows the use of tiny surface-mount components. The MAX1889 QFN package (1.0mm max) with low-profile external components allows this circuit to be 1.25mm high. o 2.7V to 5.5V Input Range o Output Voltages 9V Output at 200mA (Step-Up Switching) 20V Output >10mA (Positive Charge-Pump Regulator) -7V Output >10mA (Negative Charge-Pump Regulator) o Resistor-Adjustable Outputs o Up to Three Positive and Three Negative ChargePump Stages o Up to +28V and -22V Linear-Regulated Output (As Configured) o 90% Efficiency o 500kHz/1MHz Step-Up Switching Frequency o Overcurrent Protection o Low Profile o Surface-Mount Components o Fully Assembled and Tested
Features
Evaluates: MAX1889
Ordering Information
PART MAX1889EVKIT TEMP RANGE 0°C to +70°C IC PACKAGE 16 QFN 5mm x 5mm
Component List
DESIGNATION QTY C1 1 DESCRIPTION 0.47µF ±10%, 16V X7R ceramic capacitor (0805) Taiyo Yuden EMK212BJ474KD 3.3µF ±20%, 6.3V X5R ceramic capacitors (0805) Taiyo Yuden JMK212BJ335MG 4.7µF ±20%, 10V X7R ceramic capacitors (1210) Taiyo Yuden LMK325BJ475MF 0.01µF ±10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H103K DESIGNATION QTY C8 1 DESCRIPTION 220pF ±10%, 50V COG ceramic capacitor (0603) TDK C1608COG1H221K 0.22µF ±10%, 10V X7R ceramic capacitor (0603) Taiyo Yuden LMK107BJ224KA 0.1µF ±10%, 50V X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG 0.15µF ±10%, 50V X7R ceramic capacitors (1206) Taiyo Yuden UMK316BJ154KF
C2, C3
2
C9
1
C4, C5, C6
3
C10C14, C17, C18, C19, C21, C22
10
C7
1
C15, C20
2
________________________________________________________________ Maxim Integrated Products
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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.
MAX1889 Evaluation Kit Evaluates: MAX1889
Component List (continued)
DESIGNATION QTY C16, C23 2 DESCRIPTION 1µF ±10%, 25V X7R ceramic capacitors (0805) TDK C2012X7R1E105K 1000pF ±10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H102K 100µF ±20%, 16V aluminum electrolytic capacitor (6.3mm x 5mm) Sanyo 16MV100UAX 2200pF ±10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H222K 470pF ±10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H471K 100pF ±10%, 50V COG ceramic capacitor (0603) TDK C1608COG1H101K 1.0A, 30V Schottky diode (S-flat) Toshiba CRS02 200mA 25V Schottky diodes (SOT23) Fairchild BAT54S 200mA 75V diode (SOT23) Fairchild MMBD4148 2-pin headers 3-pin headers 4-pin headers 4.7µH, 1.6A inductor Coilcraft Inc. LPO2506IB-472 DESIGNATION QTY P1 P2 Q1 1 0 1 DESCRIPTION 2.4A, -20V P-channel MOSFET (3-pin SuperSOT) Fairchild FDN304P Not installed MOSFET (µ8) 200mA, 40V NPN bipolar transistor (SOT23) Fairchild MMBT3904 200mA, 40V PNP bipolar transistor (SOT23) Fairchild MMBT3906 51.1k ±1% resistor (0805) 150k ±1% resistors (0805) 1M ±5% resistors (0805) 76.8k ±1% resistor (0805) 12.1k ±1% resistor (0805) 10k ±5% resistor (0805) 3k ±5% resistors (0805) 24.3k ±1% resistor (0805) 301k ±1% resistor (0805) 20k ±1% resistors (0805) 10 ±5% resistor (0805) 220k ±5% resistor (0805) 15k ±5% resistor (0805) 43.2k ±1% resistor (0805) Not installed resistor (0603) MAX1889EGE (16-pin QFN 5mm x 5mm) Shunts (JU1JU8) MAX1889 PC board MAX1889 data sheet MAX1889 EV kit data sheet
C24, C26, C28
3
C25
1
Q2 R1 R2, R10, R20 R3, R4, R7 R5 R6 R8 R9, R12 R11 R13 R14, R18 R15 R16 R17 R19 R21 U1 None None None None
1 1 3 3 1 1 1 2 1 1 2 1 1 1 1 1 1 8 1 1 1
C27
1
C29
1
C30
1
D1 D2D7 D8 JU1, JU2 JU3, JU8 JU4JU7 L1
1 6 1 2 2 4 1
Component Suppliers
SUPPLIER Coilcraft Fairchild Sanyo Taiyo Yuden TDK Toshiba PHONE 847-639-6400 408-822-2000 619-661-6322 800-348-2496 847-803-6100 949-455-2000 FAX 847-639-1469 408-822-2102 619-661-1055 847-925-0899 847-390-4405 949-859-3963 WEBSITE www.coilcraft.com www.fairchildsemi.com www.sanyovideo.com www.t-yuden.com www.component.tdk.com www.toshiba.com/taec
Note: Please indicate that you are using the MAX1889 when contacting these component suppliers. 2 _______________________________________________________________________________________
MAX1889 Evaluation Kit
Quick Start
Recommended Equipment
· · 2.7V to 5.5V, 2A DC power supply One voltmeter As configured, the negative charge pump uses one of the three charge-pump stages to generate approximately -7.6V and can provide greater than 10mA. The output is post-regulated to -7V using a linear-regulator controller and an external bipolar pass transistor. The n e g a t i v e linear regulator's output can be adjusted between 0 and -22V or, with additional circuitry, to even lower voltages (refer to the Linear-Regulator Controllers section in the MAX1889 data sheet). The EV kit includes input-current overload protection that shuts down the circuit if the input current exceeds a threshold for longer than 64ms. The threshold is set by resistor-divider R1, R2, R19, R20, and the RDS(ON) of MOSFET P1 or P2. Refer to the Setting the Input Overcurrent Threshold section in the MAX1889 data sheet for further details. The EV kit also includes output overload protection that shuts down the circuit if any of the output voltages drop below approximately 80% of their nominal value for longer than 64ms.
Evaluates: MAX1889
Procedure The MAX1889 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) V e r i f y that there are no shunts across jumpers JU1 (SHDN), JU2 (FREQ), JU3, JU4, and JU8. 2) Verify that a shunt is across pins 1 and 2 of JU7. 3) Verify that a shunt is across pins 1 and 3 of JU6. 4) Verify that a shunt is across pins 1 and 4 of JU5. 5) Connect the positive terminal of the input power supply to the PIN pad. Connect the negative terminal of the input power supply to the PGND pad. 6) Turn on the power supply and verify that the stepup regulator output (VBST) is 9V. 7) Verify that the positive linear-regulator output (VPL) is 20V. 8) Verify that the negative linear-regulator output (VNL) is -7V. For instructions on selecting the feedback resistors for other output voltages, see the Output Voltage Selection section.
Jumper Selection
Shutdown Mode
The MAX1889 EV kit features a shutdown mode that reduces the MAX1889 quiescent current to less than 1 µ A . The 2-pin jumper, JU1, selects the shutdown mode for the MAX1889 EV kit. Table 1 lists the selectable jumper options. Caution: Do not connect an external controller to the SHDN pad while a shunt is on JU1 since the external controller can be damaged.
Detailed Description
The MAX1889 EV kit contains a step-up switching regulator and two linear-regulator controllers. It operates from a DC power supply between 2.7V and 5.5V. The switching frequency is selectable between 500kHz and 1MHz. The input and outputs of the EV kit are protected against overload. The EV kit features a shutdown mode for maximum battery life. As configured, the step-up switching regulator generates a 9V output and can provide at least 200mA of current to the output. The step-up switching-regulator output voltage can be adjusted from the input voltage up to 13V with resistors (see the Output Voltage Selection section). As configured, the positive charge pump uses two of the three charge-pump stages to generate approximately 24V and can provide greater than 10mA. The output is post-regulated to 20V using a linear-regulator controller and an external bipolar pass transistor. The positive linear regulator's output can be adjusted between 1.25V and 28V or, with additional circuitry, to even higher voltages (refer to the Linear-Regulator Controllers section in the MAX1889 data sheet).
Frequency Mode
The MAX1889 EV kit features an option to choose the switching frequency. JU2 selects the frequency mode for the MAX1889 EV kit. Table 2 lists the selectable jumper options. The EV kit is configured for 1MHz operation. Optimum performance at 500kHz requires a larger inductor value (refer to the Inductor Selection section in the MAX1889 data sheet.)
Positive Charge Pump
The positive charge pump of the MAX1889 EV kit features a n option to cascade up to three stages of charge pumps. Each stage of the charge pump can be powered from INPUT, VBST, or the previous stage. JU8, JU7, and J U 6 configure the number of stages and select the voltage source for the positive charge pump on the M A X 1 8 8 9 EV kit. Tables 3, 4, and 5 l i s t the jumper options. The default configuration of the positive charge pump of the MAX1889 EV kit is a two-stage charge pump powered from VBST as indicated in Tables 4 and 5. Refer to the Charge Pumps section of the MAX1889 data sheet for information on selecting a charge-pump configuration.
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