MAX8622ETB+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX8622ETB+T ,Fast-Charge-Time Xenon Flash Charger for Digital Still Cameras and Camera PhonesFeaturesThe MAX8622 flyback switching regulator quickly and♦ Charges Any Size Photoflash Capacitore ..
MAX8625AETD+T ,High-Efficiency, Seamless Transition, Step-Up/Down DC-DC ConverterELECTRICAL CHARACTERISTICS(V = 3.6V, ON = SKIP = IN, FB = GND, V = 3.3V, LX_ unconnected, C = C5 = ..
MAX8627ETD+ ,Low VBATT, 20µA IQ, 1MHz Synchronous Boost Converter with True ShutdownApplicationsDSC Motors and Backup PowerOrdering InformationMicroprocessor/DSP Core PowerPIN- PKG TO ..
MAX8627ETD+T ,Low VBATT, 20µA IQ, 1MHz Synchronous Boost Converter with True ShutdownELECTRICAL CHARACTERISTICS(V = V = 5V, V = V = 3.6V, V = GND, T = -40°C to +85°C, typical values ar ..
MAX8630WETD20+ ,125mA 1x/1.5x Charge Pumps for 5 White LEDs in 3mm x 3mm TDFNApplications14 TDFN-14MAX8630WETD15+T ADQ T1433-2(3mm x 3mm)Display Backlight (Up to 5 LEDs)Note: A ..
MAX8630WETD20+T ,125mA 1x/1.5x Charge Pumps for 5 White LEDs in 3mm x 3mm TDFNFeaturesThe MAX8630W/MAX8630X charge pumps drive up to 5 ♦ 93% Max/85% Avg. Efficiency (P /P ) Over ..
MB84256A-10LLP , CMOS 256K-BIT LOW POWER SRAM
MB84256A-10LPF , CMOS 256K-BIT LOW POWER SRAM
MB84VD21183EM-70PBS , Stacked MCP (Multi-Chip Package) FLASH MEMORY & SRAM CMOS
MB84VD21194EM-70PBS , Stacked MCP (Multi-Chip Package) FLASH MEMORY & SRAM CMOS
MB84VD22181FM-70PBS , 32M (X16) FLASH MEMORY & 4M (X16) STATIC RAM
MB84VD22182EE-90 ,32M (x 8/x16) FLASH MEMORY & 4M (x 8/x16) STATIC RAMFUJITSU SEMICONDUCTORDS05-50204-2EDATA SHEETStacked MCP (Multi-Chip Package) FLASH MEMORY & SRAMCMO ..

MAX8622ETB+T
Fast-Charge-Time Xenon Flash Charger for Digital Still Cameras and Camera Phones
General Description
The MAX8622 flyback switching regulator quickly and
efficiently charges high-voltage photoflash capacitors.
It is ideal for use in digital, film, cell-phone, and smart-
phone cameras that use either 2-cell alkaline/NiMH or
single-cell Li+ batteries. An internal, low-on-resistance
n-channel MOSFET improves efficiency by lowering
switch power loss.
A current-limited, continuous-mode, transformer-switch-
ing scheme quickly charges the output capacitor. The
cycle-by-cycle peak current-limit scheme has no inrush
current. Current limit is programmable to control the
maximum load drawn from the battery. An additional
input-voltage monitor loop extends battery life by
reducing the charge rate when the battery is nearly dis-
charged. This also permits the current limit to be set for
a faster charge rate under typical conditions, rather
than a level dictated by the worst-case discharge state
of the battery.
An open-drain DONEoutput indicates when the photo-
flash capacitor is completely charged. The MAX8622
automatically refreshes the output every 11s, efficiently
maintaining the capacitor charge level with minimum
battery drain.
The MAX8622 provides high charge accuracy by using
an external resistor-divider to monitor the output voltage.
Sensing directly at the transformer secondary prevents
output-capacitor discharge through feedback resistors
while still providing direct output sensing for optimum
voltage accuracy that is not transformer turns-ratio
dependent. The MAX8622 is offered in a 3mm x 3mm
10-pin TDFN package.
Applications
Digital Cameras
Cell-Phone Cameras
Film Cameras
Smartphone Cameras
Personal Media Players
FeaturesCharges Any Size Photoflash Capacitor2.8s to Charge 100µF to 300VNo Inrush CurrentHigh Accuracy Not Dependent on Transformer
Turns RatioExtends Battery Life with Input Voltage
MonitoringProgrammable Input Current Limit Up to 1.6ARobust Architecture Allows Use of Low-Cost
TransformersAutomatic Refresh ModeCharge-Done IndicatorSmall, 3mm x 3mm, 10-Pin TDFN Package
MAX8622
Fast-Charge-Time Xenon Flash Charger for
Digital Still Cameras and Camera Phones
Ordering Information
19-3637; Rev 0; 4/05
EVALUATION KIT AVAILABLE
PARTTEMP RANGE PIN-PACKAGETOP
MARK
MAX8622ETB+-40°C to +85°C10 TDFN 3mm x
3mm (T1033-1)APF
UVIENSEC
GNDFB
ISET
TDFN 3mm × 3mm
TOP VIEW
PGND
MAX8622
DONE
Pin Configuration
MAX8622
VIN
1.5V TO 5.5V
VCC
2.5V TO 5.5V
1:15
SECVCC
DONE
PGND
GND
OUTPUT
300V
UVIISETLX
Typical Operating Circuit
+Indicates lead-free packaging.
MAX8622
Fast-Charge-Time Xenon Flash Charger for
Digital Still Cameras and Camera Phones
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= VEN= 3.3V, VFB= 0V, RISET= 75kΩ, VUVI= 1.5V, TA= -40°C to +85°C. Typical values are at TA= +25°C, unless otherwise
noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
LX to PGND............................................................-0.3V to +33V
DONE, VCC, UVI to GND..........................................-0.3V to +6V
FB, EN, ISET to GND..................................-0.3V to (VCC+ 0.3V)
PGND to GND......................................................-0.3V to +0.3V
SEC Current...................................................................±200mA
DONECurrent...................................................................±25mA
Continuous Power Dissipation (TA= +70°C)
TDFN (derate 18.5mW/°C above +70°C)...................1481mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature Range............................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
VCC Voltage Range2.55.5V
VCC rising2.1802.3002.425VCC Undervoltage ThresholdVCC falling2.0952.2102.325V
LX switching at 40kHz1
LX switching at 300kHz1.65mAVCC Supply Current
LX not switching, VCC = 5.5V60100µA
TA = +25°C0.11VCC Shutdown CurrentVEN = 0V, VCC = 5.5VTA = +85°C0.1µA
VCC = 3.3V0.310.5LX On-ResistanceILX = 200mAVCC = 2.5V0.350.6Ω
TA = +25°C0.11LX Off-LeakageVLX = 5.5V, VEN = 0VTA = +85°C0.1µA
RISET = 200kΩ, TA = 0°C to +85°C0.540.610.72
RISET = 75kΩ, TA = 0°C to +85°C1.441.601.76LX Peak Current Limit
ISET = VCC, TA = 0°C to +85°C1.441.601.76
Switching FrequencyCircuit of Figure 2, output 90% of final value300kHz
SEC Sense Resistance1.7Ω
ISEC falling, RISET = 200kΩ10
ISEC falling, RISET = 75kΩ27SEC Valley Current Threshold
ISEC falling, ISET = VCC27
TA = 0°C to +85°C1.2381.2501.262FB Trip ThresholdVFB risingTA = -40°C to +85°C1.2311.2501.269V
TA = +25°C0.11FB Input CurrentVFB = 1.25V and EN = high,
or VEN = VFB = 0VTA = +85°C0.1µA
Output Refresh RateFrom FB pulsed high to LX switching restarts11s
ISET Resistance RangeSets peak current limit from 0.6A to 1.6A75200kΩ
VEN = VCC1.0ISET VoltageV
MAX8622
Fast-Charge-Time Xenon Flash Charger for
Digital Still Cameras and Camera Phones
Note 1:Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design
and characterization.
ELECTRICAL CHARACTERISTICS (continued)
(VCC= VEN= 3.3V, VFB= 0V, RISET= 75kΩ, VUVI= 1.5V, TA= -40°C to +85°C. Typical values are at TA= +25°C, unless otherwise
noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
TA = 0°C to +85°C1.962.002.04UVI Trip Threshold FallingExternal 25kΩ resistor in series
with UVITA = -40°C to +85°C1.942.002.06V
TA = 0°C to +85°C2.102.142.18UVI Trip Threshold RisingExternal 25kΩ resistor in series
with UVITA = -40°C to +85°C2.082.142.20V
UVI Pulldown Resistance25kΩ
TA = +25°C0.11UVI Input CurrentVEN = 0V, VUVI = VCC = 5.5VTA = +85°C0.1µA
VIH0.4EN Input VoltageWhen charging starts/stopsVIL1.4V
TA = +25°C0.11EN Input Leakage CurrentVEN = 0 to 5.5VTA = +85°C0.1µA
DONE Output-Voltage LowIDONE = 5mA40150mV
TA = +25°C0.11DONE Output-Current HighVDONE = 5.5VTA = +85°C0.1µA
MAX8622
Fast-Charge-Time Xenon Flash Charger for
Digital Still Cameras and Camera Phones
Typical Operating Characteristics
(VCC= VIN= VEN= 3.5V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
CHARGE TIME (FROM 30V TO 300V)
vs. INPUT VOLTAGE (1.6A PEAK)
MAX8622 toc01
INPUT VOLTAGE (V)
CHARGE TIME (s)
ISET = VCC
100μF150μF
50μF
CHARGE TIME (FROM 30V TO 300V)
vs. INPUT VOLTAGE (800mA PEAK)
MAX8622 toc02
INPUT VOLTAGE (V)
CHARGE TIME (s)
RISET = 150kΩ
50μF
100μF
150μF
EFFICIENCY vs. OUTPUT VOLTAGE
MAX8622 toc03
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
VIN = 5V
VIN = 3.5V
COUT = 150μF
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE VS. INPUT VOLTAGE
MAX8622 toc04
OUTPUT VOLTAGE vs. TEMPERATURE
MAX8622 toc05
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)35-1510
VIN = 3.5V AND 5V
PRIMARY CURRENT LIMIT
vs. ISET RESISTOR
MAX8622 toc06
ISET RESISTOR (kΩ)
PRIMARY CURRENT LIMIT (A)
PRIMARY CURRENT LIMIT
vs. TEMPERATURE
MAX8622 toc07
TEMPERATURE (°C)
PRIMARY CURRENT LIMIT (A)35-1510
ISET = VCC
PEAK PRIMARY CURRENT
vs. INPUT VOLTAGE
MAX8622 toc08
INPUT VOLTAGE (V)
PEAK PRIMARY CURRENT (A)
QUIESCENT CURRENT vs. INPUT
VOLTAGE AFTER CHARGE COMPLETE
MAX8622 toc09
QUIESCENT CURRENT (
INPUT VOLTAGE (V)
RISET = 75kΩ
MAX8622
Fast-Charge-Time Xenon Flash Charger for
Digital Still Cameras and Camera Phones
Typical Operating Characteristics (continued)
(VCC= VIN= VEN= 3.5V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
MAX8622 toc10
1μs/div
ISEC
IPRI
VLX
100mA/div
1A/div
10V/div
VOUT = 100V
LINE STEP THROUGH UVI
MAX8622 toc11
20μs/div
IPRI
VIN500mV/div
1A/div
VIN = 2.4V TO 2.0V TO 2.4V, VCC = 3.5V,
VOUT = 100V, RUVI = 25kΩ
CHARGE PROFILE
MAX8622 toc12
1s/div
VLX
VOUT
VDONE
VEN
10V/div
100V/div
5V/div
5V/div
C3 = 150μF
Pin Description
PINNAMEFUNCTIONISET
Current-Limit Set. Connect a resistor from ISET to GND to set the peak current limit through the
primary winding (RISET = 1.6A x 75kΩ / IPEAK), or connect ISET directly to VCC for the default current
limit of 1.6A.
2FBOutput Feedback. Connect FB to a resistor-divider from the transformer secondary winding to set the
output voltage at which charging is complete.
3VCCSupply Voltage for the IC. Connect a 1µF capacitor from VCC to GND.GNDAnalog Ground. Connect GND to the exposed pad.PGNDPower Ground. Connect PGND to the exposed pad.LXTransformer Primary Connection. Connect LX to the transformer primary as shown in Figure 2.SECSecondary Current Sensing. Connect SEC to the return of the secondary winding to sense secondary
winding current. See Figure 2.DONECharge-Done Indicator. DONE is an open-drain output that pulls low when EN is high and the circuit
has finished charging the output capacitor.ENEnable Input. Drive EN high to turn on the charger, or low to turn it off.UVI
Input Undervoltage Detect. Connect a resistor from UVI to the battery to make a resistor-divider with
an internal 25kΩ resistor. Input current is reduced when VUVI drops below 1V. Connect UVI to VCC
when this feature is not used.EPExposed Pad. Connect the exposed pad to GND and PGND.
MAX8622
Detailed Description
The MAX8622 charges photoflash capacitors quickly
and efficiently. It employs a transformer flyback DC-DC
conversion topology and includes a 0.31Ωinternal
power switch. Figure 1shows the functional diagram.
Control Scheme
The MAX8622 uses a constant peak and valley current
control scheme to precisely control the photoflash
capacitor charging current. A resistor at ISET and the
transformer turns ratio sets the charge current.
Pulling EN high initiates charging. LX turns on and the
current in the transformer primary winding rises to a
peak current between 0.6A and 1.6A, depending on
the ISET resistor (1.6A if ISET is connected to VCC). LX
then turns off, and current is delivered to the photoflash
capacitor by the transformer secondary and rectifying
diode. As secondary current ramps down, it is moni-
tored through the SEC pin. When this current drops to
1.67% (with a 1:15 transformer turns ratio) of the peak
current limit, the LX switch turns on and a new charge
cycle begins. This cycle repeats itself, adding power to
the photoflash capacitor until the target output voltage
is reached.
Switching frequency is determined by the time required
to ramp the primary-side inductance to the LX current
limit and the discharge rate of the secondary current.
The switching frequency changes as the output capaci-
tor charges to the target output voltage. Once the tar-
get output voltage is reached, the MAX8622
automatically refreshes the output every 11s, efficiently
maintaining the capacitor charge level with minimum
battery drain. The MAX8622 draws only 60µA (typ) in
automatic refresh mode. Automatic refresh can be
overridden by pulling EN low.
Secondary Side Sensing
Output regulation is accomplished using a resistor-
divider connected to the anode of the output rectifying
diode (see Figure 2). This connection eliminates DC
current drain on the output capacitor while still provid-
ing direct output sensing for optimum voltage accuracy
that is not dependent on transformer turns ratio. The
MAX8622 samples FB during the flyback phase (when
LX is off). When FB rises above 1.25V, charging stops
and DONEpulls low. If EN remains high, autorefresh
then occurs every 11s. See the Adjustable Output
Voltagesection for information on selecting values for
the resistor-divider.
Fast-Charge-Time Xenon Flash Charger for
Digital Still Cameras and Camera Phones
REF
1.5V TO 5.5V
REF
VCC
VIN
2.5V TO 5.5VVCC
VOUT
ISETUVI
DONE
MAX8622
REF
SEC
PGND
300V
VCC
GND
0.1μs
11s
TTL
20μs

Partno	Mfg	Dc	Qty	Available	Descript
MAX8622ETB+T \|MAX8622ETBT	MAXI	N/a	1890	avai	Fast-Charge-Time Xenon Flash Charger for Digital Still Cameras and Camera Phones