Capacitor Charger. A8436 Datasheet

A8436 Charger. Datasheet pdf. Equivalent

Part A8436
Description Photoflash Capacitor Charger
Feature www.DataSheet4U.com A8436 Photoflash Capacitor Charger with IGBT Driver Features and Benefits ▪ ▪ ▪.
Manufacture Allegro MicroSystems
Datasheet
Download A8436 Datasheet



A8436
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A8436
Photoflash Capacitor Charger with IGBT Driver
Features and Benefits
Power with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries
Adjustable output voltage
>75% efficiency
Three levels of switch current limit: 1.0, 1.2, 1.4 A
Fast charge time
Charge complete indication
Integrated IGBT driver with trigger
No primary-side Schottky diode needed
Low-profile package (0.75 mm nominal height)
Package: 10 pin TDFN/MLP (suffix EJ)
Approximate Scale 1:1
Description
The A8436 is a highly integrated IC that charges photoflash
capacitors for digital and film cameras. It also features an
integrated IGBT driver that facilitates the flash discharge
function and saves board space.
To charge the photoflash capacitor, the A8436 integrates a
40 V, DMOS switch that drives the transformer in a flyback
topology, allowing optimized design with tight coupling and
high efficiency. A proprietary control scheme optimizes the
capacitor charging time. Low quiescent current and low
shutdown current further improve system efficiency and
extend battery life.
Three levels of switch current limit are provided: 1.0, 1.2,
and 1.4 A. The level is determined by configuring the ILIM
pin as grounded, floating, or pulled up to IC supply voltage,
respectively.
The CHARGE pin enables the A8436 and starts the charging
of the output capacitor. When the designated output voltage
is reached, the A8436 stops the charging until the CHARGE
pin is toggled again. Pulling the CHARGE pin low stops
charging. The D¯¯O¯¯N¯¯E¯¯ pin is an open-drain indicator of when
the designated output voltage is reached.
TheA8436 can be used with twoAlkaline/NiMH/NiCAD or one
single-cell Li+ battery connected to the transformer primary.
Connect the VIN pin to a 3.0 to 5.5 V supply, which can be
either the system rail or the Li+ battery, if used.
The A8436 is available in a very low profile (0.75 mm) 10-
terminal 3×3 mm MLP/TDFN package, making it ideal for
space-constrained applications. It is lead (Pb) free, with 100%
matte-tin leadframe plating.
Typical Applications
VBIAS 3.0 to 5.5 V
Two Alkaline/NiMH/NiCAD or one Li+ battery
or 1.5 to 5.5 V
VBATT
T1
D1 VOUT
One Li+ battery
VBATT or 3.0 to 5.5 V
T1 D1 VOUT
R5
100 k7
R4
10 k7
C1
0.1 μF
C2
4.7 μF
1.4 A
1.2 A (N.C.)
1.0 A
VIN
ILIM
SW
FB
R6
10 k7
DONE
A8436
CHARGE
TRIGGER
IGBTDRV
R7
10 k7
GND
To IGBT Gate
R1
R2
R3
COUT
Figure 1. Typical circuit with separate power supply to transformer
R5
100 k7
R4
10 k7
C1
0.1 μF
C2
4.7 μF
1.4 A
1.2 A (N.C.)
1.0 A
VIN
ILIM
SW
FB
R6
10 k7
DONE
A8436
CHARGE
TRIGGER
IGBTDRV
R7
10 k7
GND
To IGBT Gate
Figure 2. Typical circuit with single power supply
R1
R2
R3
COUT
A8436-DS, Rev. 3



A8436
A8436
Photoflash Capacitor Charger with IGBT Driver
Description (continued)
Applications include:
Digital camera flash
Film camera flash
Cell phone flash
Emergency strobe light
Selection Guide
Part Number
A8436EEJTR-T
Package
10-pin TDFN/MLP
*Contact Allegro for additional packing options
Packing*
1500 pieces/ 7-in. reel
Absolute Maximum Ratings
Characteristic
SW pin
IGBTDRV pin
FB pin
All other pins
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VSW
VIGBTDRV
VFB
VX
TA
TJ(max)
Tstg
Range E
Notes
Rating
–0.3 to 40
–0.3 to VIN + 0.3
–0.3 to VIN
–0.3 to 7
–40 to 85
150
–55 to 150
Units
V
V
V
V
ºC
ºC
ºC
Package Thermal Characteristics
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
RθJA 4layer PCB, based on JEDEC standard
*Additional information is available on the Allegro website.
Rating Units
45 ºC/W
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com





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