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MIKROE-2479

P1-P3P4-P6P7-P9P10-P12P13-P13
© Semiconductor Components Industries, LLC, 2009
December, 2009 − Rev. 0
1 Publication Order Number:
CAT3224/D
CAT3224
4 Amp Supercapacitor
Flash LED Driver
Description
The CAT3224 is a very high−current integrated flash LED driver
which also supports the charging function for a dual−cell
supercapacitor applications. Ideal for Li−ion battery−powered
systems, it delivers up to 4 A LED flash pulses, far beyond the peak
current capability of the battery.
Dual−mode 1x/2x charge pump charges the stacked supercapacitor
to a nominal voltage of 5.4 V, while an active balance control circuit
ensures that both capacitor cell voltages remain matched. The nominal
charging current to be drawn from the battery is set by an external
resistor tied to the RC pin.
The driver also features two matched current sources. External
resistors provide the adjustment for the maximum flash mode current
(up to 4 A) and the torch mode current (up to 400 mA). A built−in
safety timer automatically terminates the flash pulse beyond a
maximum duration of 300 ms.
In addition to thermal shutdown and overvoltage protection, the
device is fully protected against external resistor programming faults
and fully supports reverse output voltage for all conditions.
The device is packaged in the tiny 16−pad TQFN 3 mm x 3 mm
package with a max height of 0.8 mm.
Features
• 2 Channels at 2 A Each in Flash Mode
• 2 Channels at 200 mA Each in Torch Mode
• Adjustable Charge Current Limit up to 1000 mA
• Flash/Torch Current Separate Adjustment
• Dual−mode 1x/2x Charge Pump
• Dual Cell Supercapacitor Balancing
• Flash Safety Timer and Ready Flag
• Supercapacitor Continuous Charging
• Shutdown CAP Leakage 3 mA
• “Zero” Current Shutdown Mode
• 80 mA Standby Current (I
VIN
)
• Over−voltage, Over−current Limiting
• Thermal Shutdown Protection
• Small 3 mm x 3 mm, 16−pad TQFN Package
• This Device is Pb−Free, Halogen Free/BFR Free and RoHS
Compliant
Applications
• High Power LED Flash
• Systems with High Peak Loads
http://onsemi.com
TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
GND
CN
CP
VIN
RT
RC
LEDA
LEDB
RF
BAL
CAP
CAP
CHRG
FLASH
TORCH
FLAG
JAAT
MARKING DIAGRAM
Device Package Shipping
ORDERING INFORMATION
CAT3224HV3−GT2 TQFN−16
(Pb−Free)
2,000/
Tape & Reel
JAAT = Specific Device Code
1
(Top View)
Note: NiPdAu Plated Finish (RoHS−compliant)
CAT3224
http://onsemi.com
2
Figure 1. Typical Application Circuit
GND
GND
826 W
RTRF
VIN (2.5 V to 5.5 V)
2A
LEDA
BAL
LEDB
CAT3224
VIN CAP
CAP
Dual−Cell
Supercapacitor
CNCP
0.55 F
+
–
2A
FLAG
CHRG
FLASH
TORCH
RC
1 mF
261 W
1 mF
562 W
1 mF
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
VIN, RC, RF, RT voltage GND−0.3 to 6 V
CAP, CP, CN voltage GND−0.3 to 7 V
CHRG, FLASH, TORCH, FLAG voltage (Note 1) GND−0.3 to 6 V
BAL, LEDA, LEDB GND−0.3 to CAP+0.3 V
Storage Temperature Range −65 to +160
_C
Junction Temperature Range −40 to +150
_C
Lead Temperature 300
_C
ESD Rating HBM (Human Body Model) 2000 V
ESD Rating MM (Machine Model) 200 V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter Rating Unit
VIN 2.0 to 5.5 V
Ambient Temperature Range −40 to +85
_C
LEDA, LEDB current (in flash mode) up to 2 A
LEDA, LEDB current (in torch mode) 10 to 200 mA
Input Current Limit up to 1 A
FLAG pull−up resistor current 0 to 10 mA
LED Forward Voltage Range (Vf) 1.3 to 4.2 V
Table 3. PACKAGE THERMAL IMPEDANCE
Parameter Range Unit
TQFN 3 mm x 3 mm 16−Lead q
JA
(Note 2)
42
_C/W
Table 4. PACKAGE TRANSIENT THERMAL IMPEDANCE
Parameter Range Unit
TQFN 3 mm x 3 mm 16−Lead Transient q
JA
(Note 3) (100 ms pulse)
7
_C/W
1. Pins can be driven above VIN with no leakage current or change in operation.
2. q
JA
(Junction to Ambient thermal resistance) is calculated with 2 square inches of copper connected to package exposed pad.
3. Transient q
JA
is calculated for a 100 ms pulse at 5 watts with 2 square inches of copper connected to package exposed pad.
CAT3224
http://onsemi.com
3
Table 5. ELECTRICAL OPERATING CHARACTERISTICS (V
IN
= 3.6 V, EN = 1.3 V, T
AMB
= 25°C unless otherwise stated.)
Symbol Name Conditions Min Typ Max Units
I
QVIN
Quiescent Current on VIN pin (I
IN
– 2 x I
OUT
)
CAP Charged & idle 80
mA
CAP Charging 2x Mode 6 mA
I
QCAP
Quiescent Current on CAP pin
CAP Charged & idle 10
mA
Shutdown mode 3
mA
Shutdown, VIN = 0 V 3
mA
I
QSHDN
Shutdown Current CHRG = FLASH = TORCH = 0 V 1
mA
G
FLASH
Flash Gain (I
FLASH
/ I
RF
) I
FLASH
= 2 A 900
G
TORCH
Torch Gain (I
TORCH
/ I
RT
) I
TORCH
= 200 mA 120
G
CHARGE
Input Current Limit Gain (I
CHRG
/ I
RC
) I
CHARGE
= 400 mA 400
V
RX
RSET Regulated Voltage (V
RF
V
RT
V
RC
) I
RX
= 0.1 mA 0.59 0.6 0.61 V
I
RX_MAX
Rset Current limit (I
RF
I
RT
I
RC
) V
RX
= 0 V 3.5 mA
I
IN_MAX
Input current limit in charge mode V
RC
= 0 V 1.4 A
V
C_OFF
CAP Charge off voltage
R
C
= 2 kW
5.4 V
V
C_HYST
CAP Charge Hysteresis 0.2 V
V
F_ON
CAP voltage FLAG pulled low 5.2 V
V
F_HYST
CAP voltage FLAG Hysteresis 0.2 V
R
LEDAB
LEDA/B Combined Dropout Resistance I
FLASHAB
= 4 A 110
mW
R
CP
Charge Mode Resistance
1x mode 2
W
2x mode, V
IN
= 3.5 V 4
W
F
OSC
Charge Pump Frequency 800 kHz
T
FLASH
Flash Timeout Duration 300 ms
V
FLAG
Flag low voltage threshold (Open Drain)
FLAG Driven low 100 mA pull−up
0.2 V
R
EN
V
EHI
V
ELO
CHRG, FLASH, TORCH Pin
Internal Pull−down Resistor
Logic High Level
Logic Low Level
1.3
150
0.4
kW
V
V
V
BAL
Active Balance Control (VCAP / 2) ±5 mA Load on BAL −2 +2 %
T
SD
Thermal Shutdown 150 °C
T
HYS
Thermal Hysteresis 20 °C
V
UVLO
Undervoltage lockout (UVLO) threshold 1.9 V
P1-P3P4-P6P7-P9P10-P12P13-P13

MIKROE-2479

Mfr. #:
Buy MIKROE-2479
Manufacturer:
Mikroe
Description:
LED Lighting Development Tools LED Flash click
Lifecycle:
New from this manufacturer.
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