MAX1583XETB ,White LED Camera-FlashFeaturesThe MAX1583 evaluation kit (EV kit) is a fully assembled♦ Supports Up to 5 LEDs for Strobe/ ..
MAX1585ETJ ,5-Channel Slim DSC Power SuppliesFeaturesThe MAX1584/MAX1585 provide a complete power- Step-Up DC-DC Converter, 95% Efficient suppl ..
MAX1585ETJ+ ,5-Channel Slim DSC Power SuppliesFeaturesThe MAX1584/MAX1585 provide a complete power-♦ Step-Up DC-DC Converter, 95% Efficient suppl ..
MAX1586 ,High-Efficiency / Low-IQ PMICs with Dynamic Core for PDAs and Smart PhonesFeaturesThe MAX1586/MAX1587 power-management ICs are ♦ Six Regulators in One Package:optimized for ..
MAX1586AETM ,High-Efficiency / Low-IQ PMICs with Dynamic Core for PDAs and Smart Phonesfeatures an additional linear regulatorMAX1587BACKUP(V6) for VCC_USIM and low-battery and dead- bat ..
MAX1586AETM ,High-Efficiency / Low-IQ PMICs with Dynamic Core for PDAs and Smart PhonesELECTRICAL CHARACTERISTICS(V = 3.6V, V = 3.0V, V = 1.1V, V = 1.35V, circuit of Figure 5, T = 0°C to ..
MAX4246AKA+T ,Ultra-Small, Rail-to-Rail I/O with Disable, Single/Dual-Supply, Low-Power Op AmpsApplicationsMAX4245AXT+T -40°C to +125°C 6 SC70 AAZ● Portable Communications● Single-Supply Zero-Cr ..
MAX4246AKA-T ,Ultra-Small / Rail-to-Rail I/O with Disable / Single-/Dual-Supply / Low-Power Op AmpsELECTRICAL CHARACTERISTICS(V = +2.7V, V = 0, V = 0, V = V /2, R connected from OUT to V /2, SHDN_ = ..
MAX4246AUA ,Ultra-Small / Rail-to-Rail I/O with Disable / Single-/Dual-Supply / Low-Power Op AmpsFeaturesThe MAX4245/MAX4246/MAX4247 family of low-cost Rail-to-Rail Input and Output Voltage Swing ..
MAX4249ESD ,SOT23 / Single-Supply / Low-Noise / Low-Distortion / Rail-to-Rail Op Ampsfeatures make the' Input Common-Mode Voltage Range Includesdevices an ideal choice for portable/bat ..
MAX4250EUK ,SOT23 / Single-Supply / Low-Noise / Low-Distortion / Rail-to-Rail Op Ampsapplications that require low distortion and/or low noise. ' Outputs Swing within 8mV of Rails with ..
MAX4250EUK ,SOT23 / Single-Supply / Low-Noise / Low-Distortion / Rail-to-Rail Op AmpsMAX4249–MAX425719-1295; Rev 2; 4/98SOT23, Single-Supply, Low-Noise,Low-Distortion, Rail-to-Rail Op ..
MAX1583XETB
MAX1583 Evaluation Kit
General DescriptionThe MAX1583 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board for evaluating
the MAX1583 white LED flash boost converter. The EV
kit accepts a 2.6V to 5.5V input voltage and drives up
to five series white LEDs with a constant current to pro-
vide camera flash/strobe in cell phones, PDAs, DSCs,
and other hand-held devices. The MAX1583 switching
frequency is 1MHz, allowing tiny external components.
Two logic inputs control four modes of operation: shut-
down mode (0.5µA max), movie mode for high-efficien-
cy continuous lighting (programmable up to 100mA),
precharge mode for charging a reservoir capacitor to
24V while the LEDs are off (POK output indicates a full
reservoir capacitor), and strobe mode for firing the flash
during an exposure with a regulated current program-
mable up to 300mA (100mA with installed compo-
nents). A pushbutton pulse generator is installed to sim-
ulate a 30ms flash pulse.
The MAX1583 comes with the MAX1583X (1A current
limit) installed, but the entire MAX1583 family can be eval-
uated with this EV kit with minor component changes.
FeaturesSupports Up to 5 LEDs for Strobe/FlashFour Operational Modes
Strobe: Up to 300mA (Preset to 100mA)
Precharge: With POK Indicator
Movie: Up to 100mA (Preset to 20mA)
Shutdown: 0.01µA (typ) Quiescent CurrentInput Current Limiting
1A (MAX1583X)
500mA (MAX1583Y)
250mA (MAX1583Z)24V Output Overvoltage Protection80% Efficient (PLED/ PIN) Movie ModeThermal-Shutdown Protection10-Lead 3mm x 3mm TDFN PackageSurface-Mount ComponentsFully Assembled and Tested
Evaluates: MAX1583
MAX1583 Evaluation Kit19-3246; Rev 0; 4/04
Ordering Information
Note:To evaluate the MAX1583Y or MAX1583Z, request a
MAX1583YETB or MAX1583ZETB free sample with the
MAX1583 EV kit.
Evaluates: MAX1583
MAX1583 Evaluation Kit
Recommended Equipment•0 to +6V at 1A, variable-output power supplyTwo digital multimeters (DMMs)
The MAX1583 EV kit is fully assembled and tested.
Perform the following steps to verify board operation: Verify that shunts are across pins 2 and 3 of
jumpers JU1 (EN2) and JU2 (EN1). This places the
MAX1583 into shutdown mode.Verify that JU3 is open.Preset the power supply to 2.7V and turn off. Do
not turn on the power supply until all connec-
tions are completed.Connect the positive lead of the power supply to the
VIN pad on the EV kit PC board. Connect the
ground lead of the power supply to the GND pad on
the EV kit PC board.Connect the positive lead of one DMM to the OUT
pad on the EV kit PC board and connect the nega-
tive lead of the DMM to the GND pad. This DMM
measures the voltage at OUT (VOUT).Connect the positive lead of the other DMM to POK
on the EV kit PC board and connect the negative
lead of the DMM to the GND pad. This DMM mea-
sures the voltage at POK (VPOK).Turn on the power supply.Verify that the white LED module is off.Remove the shunt on JU2 and place it between
pins 1 and 2 of JU2. This places the MAX1583 into
movie mode.
10)Verify that the white LED module lights up. VOUT
should read approximately 7V.
11)Sweep the input voltage from 2.7V to 5.5V, verifying
that the LED module remains on with constant
brightness and VOUTdoes not change.
12)Set the power supply to 2.7V.
13)Remove the shunt on JU2 and place it between
pins 1 and 2 of JU3. Remove the shunt on JU1 and
place it between pins 1 and 2 of JU1. This places
the MAX1583 into precharge mode.
14)Verify that the white LED module is off. Verify that
VOUTis approximately 23.5V and VPOKis approxi-
mately 2.7V.
15)Sweep the power supply to 5.5V. Verify that the LED
module remains off, VOUTis approximately 23.5V,
and VPOKtracks VVIN.
16)Set the power supply to 3.3V.
17)Push the button on the bottom of the EV kit. This
enables a strobe/flash.
18)Verify that the LED module flashes.
Detailed Description
Jumper SelectionEN1 and EN2 on the MAX1583 provide control for shut-
down mode, movie mode, precharge mode, and strobe
mode. Jumpers JU1 and JU2 connect EN2 and EN1 to
either VIN or GND (see Table1). An external signal can
be used to drive EN1 or EN2 by removing the corre-
sponding shunt completely from the jumper and con-
necting the external signal to the appropriate connect-
ing pad. JU3 enables the pulse generator for the strobe
mode. JU3 must be open if a jumper is installed on
JU2 or if EN1 is externally driven.
Setting LED CurrentThe preset LED current in movie mode is 20mA. To set
a different movie-mode LED current, change R2, where
R2 = 60 / ILED(MOVIE). The MAX1583 is capable of
movie-mode currents up to 100mA.
The preset LED current in strobe mode is 100mA. To
set a different strobe-mode LED current, change R1,
where R1 = 600 / ILED(STROBE). The MAX1583 can reg-
ulate strobe-mode LED currents up to 300mA; however,
the LED installed on the MAX1583 EV kit has a maxi-
mum pulse-current rating of 100mA. If larger currents
are desired, a new LED with a higher pulsed current
rating must be installed on the EV kit.
Evaluating Off-Board LEDsThe MAX1583 EV kit allows for easy evaluation of off-
board LEDs. To evaluate off-board LEDs, first remove
the installed LED module, D2. Next, connect the pad
labeled OUT on the EV kit to the anode of the series
LED string under evaluation and connect the cathode
of the external series LED string to the EV kit pad
labeled LED.
Changing the Strobe Pulse WidthThe MAX1583 EV kit includes a pulse generator for con-
venience in evaluating the strobe function of the
MAX1583. The strobe pulse width is determined by C4.
To change the pulse width of the strobe, replace C4 with
a capacitor corresponding to the following equation:
The minimum pulse width of the pulse generator is
1ms. Using a strobe pulse longer than 30ms may
require a larger output reservoir capacitance (C2).
Refer to the Reservoir Capacitance vs. Current Limit
section in the MAX1583 data sheet for details on calcu-
lating the required capacitance.
Evaluates: MAX1583
MAX1583 Evaluation Kit
Table 1. JU1 and JU2 Functions (Dimming Control)
Component Suppliers
Evaluates: MAX1583
MAX1583 Evaluation KitFigure 1. MAX1583 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: MAX1583
MAX1583 Evaluation KitFigure2. MAX1583 EV Kit Component Placement Guide—Top
Silkscreen
Figure3. MAX1583 EV Kit PC Board Layout—Component Side
Figure4. MAX1583 EV Kit PC Board Layout—Solder Side
This datasheet has been :
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Datasheets for electronic components.
