MAX1640EVKIT ,Evaluation Kit for the MAX1640/MAX1641FeaturesThe MAX1640 evaluation kit (EV kit) is an adjustable' 5.5V to 26V Input Voltage Rangeswitch ..
MAX1641EEE+ ,Adjustable-Output, Switch-Mode Current Sources with Synchronous RectifierELECTRICAL CHARACTERISTICS(V = +12V, V = 6V, Circuit of Figure 1, T = 0°C to +85°C, unless otherwis ..
MAX1642EUA ,High-Efficiency / Step-Up DC-DC Converters for 1V InputsFeaturesThe MAX1642/MAX1643 are high-efficiency, low-voltage,' Built-In Synchronous Rectifierstep-u ..
MAX1643EUA ,High-Efficiency / Step-Up DC-DC Converters for 1V InputsELECTRICAL CHARACTERISTICS(V = V = 1.3V, I = 0mA, FB = GND, T = 0°C to +85°C, unless otherwise note ..
MAX1644 ,2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal SwitchesELECTRICAL CHARACTERISTICS(V = V = +3.3V, FBSEL = GND, T = 0°C to +85°C, unless otherwise noted. Ty ..
MAX1644EAE ,2A, low-voltage, step-down regulator with synchronous rectification and intemal switchesfeatures internal' Internal PMOS and NMOS Switchessynchronous rectification for high efficiency and ..
MAX4391ESA ,CMOS Micropower Inverting Switching RegulatorGeneral Description
Maxim's MAX634 and MAX4391 CMOS DC-DC regu-
lators are designed for simple, ..
MAX4391ESA+ ,CMOS, Micropower, Inverting Switching RegulatorELECTRICAL CHARACTERISTICS
(+VS = +6.0V, TA = +25°C, unless otherwise noted)
MAx634 MAX4391 - ..
MAX4392ESA ,Ultra-Small / Low-Cost / 85MHz Op Amps with Rail-to-Rail Outputs and DisableELECTRICAL CHARACTERISTICS—Single Supply(V = 5V, V = 0V, V = V /2, V = V /2, R = ∞ to V /2, DISABLE ..
MAX4392ESA+ ,Ultra-Small, Low-Cost, 85MHz Op Amps with Rail-to-Rail Outputs and Disableapplications). The MAX4389/MAX4390/• -59dBc Spurious-Free Dynamic RangeMAX4392–MAX4396 consume only ..
MAX4392ESA+T ,Ultra-Small, Low-Cost, 85MHz Op Amps with Rail-to-Rail Outputs and Disableapplications where an • 500V/μs Slew Rateinput or an output is exposed to the outside world, such a ..
MAX4392EUA ,Ultra-Small / Low-Cost / 85MHz Op Amps with Rail-to-Rail Outputs and Disableapplications27MHz 0.1dB Gain Flatness where an input or an output is exposed to the outside500V/µs ..
MAX1640EVKIT
Evaluation Kit for the MAX1640/MAX1641
_______________General DescriptionThe MAX1640 evaluation kit (EV kit) is an adjustable
switch-mode current source that operates from a 5.5V to
26V input. It is intended for microprocessor-controlled
battery chargers. The charging current, maximum volt-
age, and pulse-trickle charge are programmed with
external resistors. The EV kit is shipped configured for
a maximum charge voltage (6 cells). It is configured
as a step-down pulse-width modulator (PWM) with syn-
chronous rectification, allowing fast-charge currents up
to 1.5A with greater than 90% efficiency. The MAX1640
uses high-side current sense; this allows the load to
connect directly to ground, eliminating ground potential
errors. The MAX1641 uses low-side current sense.
The MAX1640 EV kit is a fully assembled and tested sur-
face-mount printed circuit board. It can also be used to
evaluate the MAX1641.
____________________________Features5.5V to 26V Input Voltage RangeTight Current-Regulation Accuracy:
2% (MAX1641); 5% (MAX1640)Up to 1.5A Fast-Charge CurrentUp to 500kHz PWM OperationPulse-Trickle Charge Current100% Maximum Duty Cycle (low dropout)Synchronous RectifierSurface-Mount ComponentsFully Assembled and Tested
Evaluates: MAX1640/MAX1641
MAX1640 Evaluation Kit
_____________________________________________________________Component List
______________Ordering Information
Note:To evaluate the MAX1641, request a MAX1641EEE free
sample with the MAX1640 EV kit.
Evaluates: MAX1640/MAX1641
MAX1640 Evaluation Kit
Note:Please indicate that you are using the MAX1640 when
contacting these component suppliers.
_________________________Quick StartThe MAX1640 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.Set the number of cells in the battery pack being
charged by placing the shunt across J3, pins 1
and 6. The MAX1640 EV kit is shipped configured
for six cells and 1.5A of charge current.Connect the input power supply (26V max) to the
2-pin power connector J1. The input supply must
be 1V greater than the maximum battery-charging
voltage and capable of providing the charge cur-
rent.Connect the battery terminals to the 2-pin power
connector J2. Observe the polarity markings.Turn on the power supply to the board, and use a
voltmeter to confirm the voltage across the battery.
_______________Detailed DescriptionThe MAX1640 EV kit is a switch-mode current source
that uses a hysteretic current-mode, step-down, pulse-
width-moduled (PWM) topology with constant off time.
The switching mechanism is controlled by internal com-
parators that monitor the current through a sense resis-
tor (R1 or R2) and the voltage at TERM. When the
inductor current reaches the current limit, the P-channel
FET turns off, and the N-channel FET synchronous rec-
tifier turns on. Inductor energy is delivered to the load
as the current ramps down at a rate controlled by a
resistor from TOFF to ground (R3) and the inductor
value. When the off time expires, the P-channel FET is
turned back on, and the N-channel FET is turned off.
Selecting the Output Current LevelsSwitch SW1 controls the two digital inputs, D0 and D1,
that select between four possible current levels (see
Table 1).
In pulse-trickle mode, the switch is on for 12.5% of the
period set by R3, resulting in a lower current for trickle
charging. Refer to the Programming the Output
Currentssection in the MAX1640/MAX1641 data sheet
for instructions on selecting the current levels.
Selecting the Number of CellsSelection of the maximum charge voltage (number of
cells) in the MAX1640 EV kit is made via a voltage
divider selected by J3. Place the shunt across the J3
pins to select the desired number of cells as indicated
by the silkscreen on the board. Refer to the section
Setting the Maximum Output Voltage Levelin the
MAX1640/MAX1641 data sheet for instructions on
selecting the resistor-divider values. The EV kit is
shipped configured for a maximum charge voltage of
12V (six cells). Refer to Table 2 for the selectable J3
options.
__________Evaluating the MAX1641The MAX1640 EV kit can also be used to evaluate the
MAX1641. Replace the MAX1640 with the MAX1641,
cut jumpers JU2 and JU4, and install jumpers JU1 and
JU3. Table 3 summarizes the JU1–JU4 functions.
Evaluates: MAX1640/MAX1641
MAX1640 Evaluation Kit
Table 3. Jumper JU1–JU4 FunctionsFigure 1. MAX1640 EV Kit Schematic
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.
Evaluates: MAX1640/MAX1641
MAX1640 Evaluation KitFigure 2. MAX1640 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX1640 EV Kit PC Board Layout—Component Side
Figure 4. MAX1640 EV Kit PC Board Layout—Solder Side
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