MAX1889 Evaluation MAX1889 evaluation kit) fully assembled tested
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MAX1889 Evaluation
MAX1889 evaluation kit) fully assembled tested surface-mount circuit board that contains step-up switching regulator, positive three-stage charge-pump high-voltage positive linear-regulator controller, negative three-stage charge-pump high-voltage negative linear-regulator controller. step-up switching circuit configured output provides 200mA from supply voltage 2.7V 5.5V. positive charge-pump linear regulator configured output using charge-pump stages providing 10mA. negative charge pump linear regulator configured output using single charge-pump stage providing 10mA. Power positive charge-pump input provided input source step-up switching regulator output. Power negative charge-pump input provided input source power ground. MAX1889 demonstrates quiescent current high efficiency 90%) maximum battery life. features overload protection input outputs. Operation 1MHz allows tiny surface-mount components. MAX1889 package (1.0mm max) with low-profile external components allows this circuit 1.25mm high. 2.7V 5.5V Input Range Output Voltages Output 200mA (Step-Up Switching) Output >10mA (Positive Charge-Pump Regulator) Output >10mA (Negative Charge-Pump Regulator) Resistor-Adjustable Outputs Three Positive Three Negative ChargePump Stages +28V -22V Linear-Regulated Output Configured) Efficiency 500kHz/1MHz Step-Up Switching Frequency Overcurrent Protection Profile Surface-Mount Components Fully Assembled Tested
Features
Evaluates: MAX1889
Ordering Information
PART MAX1889EVKIT TEMP RANGE +70°C PACKAGE
Component List
DESIGNATION DESCRIPTION 0.47µF ±10%, ceramic capacitor (0805) Taiyo Yuden EMK212BJ474KD 3.3µF ±20%, 6.3V ceramic capacitors (0805) Taiyo Yuden JMK212BJ335MG 4.7µF ±20%, ceramic capacitors (1210) Taiyo Yuden LMK325BJ475MF 0.01µF ±10%, ceramic capacitor (0603) C1608X7R1H103K DESIGNATION DESCRIPTION 220pF ±10%, ceramic capacitor (0603) C1608COG1H221K 0.22µF ±10%, ceramic capacitor (0603) Taiyo Yuden LMK107BJ224KA 0.1µF ±10%, ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG 0.15µF ±10%, ceramic capacitors (1206) Taiyo Yuden UMK316BJ154KF
C10-C14, C17, C18, C19, C21,
C15,
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1889 Evaluation Evaluates: MAX1889
Component List (continued)
DESIGNATION C16, DESCRIPTION ±10%, ceramic capacitors (0805) C2012X7R1E105K 1000pF ±10%, ceramic capacitors (0603) C1608X7R1H102K 100µF ±20%, aluminum electrolytic capacitor (6.3mm 5mm) Sanyo 16MV100UAX 2200pF ±10%, ceramic capacitor (0603) C1608X7R1H222K 470pF ±10%, ceramic capacitor (0603) C1608X7R1H471K 100pF ±10%, ceramic capacitor (0603) C1608COG1H101K 1.0A, Schottky diode (S-flat) Toshiba CRS02 200mA Schottky diodes (SOT23) Fairchild BAT54S 200mA diode (SOT23) Fairchild MMBD4148 2-pin headers 3-pin headers 4-pin headers 4.7µH, 1.6A inductor Coilcraft Inc. LPO2506IB-472 DESIGNATION DESCRIPTION 2.4A, -20V P-channel MOSFET (3-pin SuperSOT) Fairchild FDN304P installed MOSFET (µ8) 200mA, bipolar transistor (SOT23) Fairchild MMBT3904 200mA, bipolar transistor (SOT23) Fairchild MMBT3906 51.1k resistor (0805) 150k resistors (0805) resistors (0805) 76.8k resistor (0805) 12.1k resistor (0805) resistor (0805) resistors (0805) 24.3k resistor (0805) 301k resistor (0805) resistors (0805) resistor (0805) 220k resistor (0805) resistor (0805) 43.2k resistor (0805) installed resistor (0603) MAX1889EGE (16-pin 5mm) Shunts (JU1-JU8) MAX1889 board MAX1889 data sheet MAX1889 data sheet
C24, C26,
R10, R14, None None None None
D2-D7 JU1, JU3, JU4-JU7
Component Suppliers
SUPPLIER Coilcraft Fairchild Sanyo Taiyo Yuden Toshiba PHONE 847-639-6400 408-822-2000 619-661-6322 800-348-2496 847-803-6100 949-455-2000 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 using MAX1889 when contacting these component suppliers.
MAX1889 Evaluation
Quick Start
Recommended Equipment
2.7V 5.5V, power supply voltmeter configured, negative charge pump uses three charge-pump stages generate approximately -7.6V provide greater than 10mA. output post-regulated using linear-regulator controller external bipolar pass transistor. negative linear regulator's output adjusted between -22V with additional circuitry, even lower voltages (refer Linear-Regulator Controllers section MAX1889 data sheet). includes input-current overload protection that shuts down circuit input current exceeds threshold longer than 64ms. threshold resistor-divider R19, R20, RDS(ON) MOSFET Refer Setting Input Overcurrent Threshold section MAX1889 data sheet further details. also includes output overload protection that shuts down circuit output voltages drop below approximately their nominal value longer than 64ms.
Evaluates: MAX1889
Procedure MAX1889 fully assembled tested. Follow these steps verify board operation. turn power supply until connections completed: Verify that there shunts across jumpers (SHDN), (FREQ), JU3, JU4, JU8. Verify that shunt across pins JU7. Verify that shunt across pins JU6. Verify that shunt across pins JU5. Connect positive terminal input power supply pad. Connect negative terminal input power supply PGND pad. Turn power supply verify that stepup regulator output (VBST) Verify that positive linear-regulator output (VPL) 20V. Verify that negative linear-regulator output (VNL) -7V. instructions selecting feedback resistors other output voltages, Output Voltage Selection section.
Jumper Selection
Shutdown Mode
MAX1889 features shutdown mode that reduces MAX1889 quiescent current less than 1µA. 2-pin jumper, JU1, selects shutdown mode MAX1889 kit. Table lists selectable jumper options. Caution: connect external controller SHDN while shunt since external controller damaged.
Detailed Description
MAX1889 contains step-up switching regulator linear-regulator controllers. operates from power supply between 2.7V 5.5V. switching frequency selectable between 500kHz 1MHz. input outputs protected against overload. features shutdown mode maximum battery life. configured, step-up switching regulator generates output provide least 200mA current output. step-up switching-regulator output voltage adjusted from input voltage with resistors (see Output Voltage Selection section). configured, positive charge pump uses three charge-pump stages generate approximately provide greater than 10mA. output post-regulated using linear-regulator controller external bipolar pass transistor. positive linear regulator's output adjusted between 1.25V with additional circuitry, even higher voltages (refer Linear-Regulator Controllers section MAX1889 data sheet).
Frequency Mode
MAX1889 features option choose switching frequency. selects frequency mode MAX1889 kit. Table lists selectable jumper options. configured 1MHz operation. Optimum performance 500kHz requires larger inductor value (refer Inductor Selection section MAX1889 data sheet.)
Positive Charge Pump
positive charge pump MAX1889 features option cascade three stages charge pumps. Each stage charge pump powered from INPUT, VBST, previous stage. JU8, JU7, configure number stages select voltage source positive charge pump MAX1889 kit. Tables list jumper options. default configuration positive charge pump MAX1889 two-stage charge pump powered from VBST indicated Tables Refer Charge Pumps section MAX1889 data sheet information selecting charge-pump configuration.
MAX1889 Evaluation Evaluates: MAX1889
Table Functions
SHUNT LOCATION Installed None SHDN Connected PGND Connected through MAX1889 OUTPUT Shutdown mode MAX1889 enabled
Table Functions
SHUNT LOCATION Installed None FREQ Connected PGND Connected through MAX1889 FREQUENCY Frequency 500KHz Frequency 1MHz
None
External controller Logic high (IN) enabled, connected logic (PGND) disabled SHDN
Table Functions
SHUNT LOCATION FIRST STAGE POSITIVE CHARGE PUMP OPERATING MODE
Table Functions
SHUNT LOCATION SECOND STAGE POSITIVE CHARGE PUMP OPERATING MODE First stage twostage charge pump powered VBST Second stage three-stage charge pump First stage twostage charge pump powered INPUT used one-stage charge pumps
Connected VBST
First stage threestage charge pump powered VBST
(Default)
Connected VBST
First stage threeConnected INPUT stage charge pump powered INPUT used one-stage two-stage charge pumps
Connected previous stage charge-pump output
None
used
Connected INPUT
None
used
Negative Charge Pump
negative charge pump MAX1889 features option cascade three stages charge pumps. Each stage charge pump powered from INPUT, PGND, previous stage. JU3, JU4, configure number stages select voltage source negative charge pump MAX1889 kit. Tables list jumper options. default configuration negative charge pump MAX1889 one-stage charge pump powered from PGND indicated Table Refer Charge Pumps section MAX1889 data sheet information selecting charge-pump configuration.
Output Voltage Selection
Step-Up Switching-Regulator Output Voltage
MAX1889 kit's step-up switching-regulator output feedback resistors generate output voltages other than 13V), select different external voltage-divider resistors (R5, R6). output capacitors (C4, rated 10V. output voltage greater than 10V, higher-voltage rated capacitors. Refer Main StepUp Regulator, Output Voltage Selection section MAX1889 data sheet instructions selecting resistors.
MAX1889 Evaluation Evaluates: MAX1889
Table Functions
SHUNT LOCATION THIRD STAGE POSITIVE CHARGE PUMP OPERATING MODE One-stage charge pump powered VBST Last stage two-stage three-stage charge pump One-stage charge pump powered INPUT
Table Functions
SHUNT LOCATION FIRST STAGE NEGATIVE CHARGE PUMP OPERATING MODE First stage threestage charge pump powered INPUT First stage threestage charge pump powered PGND used onestage two-stage charge pump
Connected VBST
Connected INPUT
(Default)
Connected previous stage charge-pump output
Connected PGND
None
used
Connected INPUT
Table Functions
SECOND STAGE SHUNT NEGATIVE CHARGE LOCATION PUMP OPERATING MODE First stage twostage charge pump powered INPUT Second stage threestage charge pump First stage twostage charge pump powered PGND used one-stage charge pump
Table Functions
THIRD STAGE SHUNT NEGATIVE CHARGE LOCATION PUMP Connected INPUT Connected previous stage charge-pump output Connected PGND OPERATING MODE One-stage charge pump powered INPUT Last stage twostage three-stage charge pump One-stage charge pump powered PGND
Connected INPUT
Connected previous stage charge-pump output
(Default)
Connected PGND
None
used
Positive Linear-Regulator Output Voltage
MAX1889 kit's positive linear-regulator output feedback resistors R14. generate output voltages other than (1.25V 28V), select different external voltage-divider resistors (R13, R14). Refer Linear-Regulator Controllers, Output Voltage Selection section MAX1889 data sheet instructions selecting resistors.
Negative Linear-Regulator Output Voltage
MAX1889 kit's negative linear-regulator output feedback resistors R11. generate output voltages other than -22V), select different external voltage-divider resistors (R10, R11). Refer Linear-Regulator Controllers, Output Voltage Selection section MAX1889 data sheet instructions selecting resistors.
MAX1889 Evaluation Evaluates: MAX1889
INPUT 3.3µF 6.3V
43.2k
150k
4.7µF 4.7µF
VBST
PGND
3.3µF 6.3V
4.7µH
76.8k 0.01µF
4.7µF PGND
1000pF 51.1k 100pF 150k GATE
12.1k
220pF
0.47µF
100µF
SHDN SHDN 0.22µF
VREF
MAX1889
FREQ
PGND
PGND OPEN
DRVN
DRVN
DRVP
DRVP
Figure MAX1889 Schematic (Sheet
MAX1889 Evaluation Evaluates: MAX1889
0.1µF 0.1µF 0.1µF 0.1µF 0.1µF 0.1µF
INPUT
0.1µF
0.1µF
0.15µF
0.15µF
0.1µF
0.1µF
INPUT
INPUT
INPUT
INPUT VBST
INPUT
VBST VBST
1000pF 2200pF 470pF 1000pF 301k
PGND
24.3k 150k
PGND
VREF
VBST
220k DRVN DRVP
Figure MAX1889 Schematic (Sheet
MAX1889 Evaluation Evaluates: MAX1889
Figure MAX1889 Component Placement Guide- Component Side
Figure MAX1889 Component Placement Guide- Solder Side
Figure MAX1889 Board Layout-Component Side
Figure MAX1889 Board Layout-Solder Side
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2002 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.
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