A8739EEETR-T Allegro Microsystems Inc, A8739EEETR-T Datasheet - Page 3

• Manufacturer Part Number: A8739EEETR-T
• Description: Photoflash Capacitor Charger
• Manufacturer: Allegro Microsystems Inc
• Type: Flash/Torchr

Specifications of A8739EEETR-T

• Number Of Outputs: *
• Internal Driver: No
• Type - Primary: Flash/Torch
• Voltage - Supply: *
• Mounting Type: Surface Mount
• Package / Case: 8-UFDFN Exposed Pad
• Operating Temperature: *
• Voltage - Output: *
• Frequency: *
• Current - Output / Channel: *
• Internal Switch(s): Yes
• Efficiency: 75%
• Topology: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 620-1365-2

A8739
DONE
GATE
TRIG
GND
Pin-out Diagram
1
2
3
4
CHARGE
(Top View)
VIN_DRV
VBAT
PAD
TRIG
8
7
6
5
CHARGE
VIN_DRV
VBAT
SW
V
Reference
SW
Decoder
ILIM
– V
V
BAT
DS
Ultra-Small Mobile Adjustable Xenon Photoflash
ref
Terminal List
Number
1
2
3
4
5
6
7
8
–
t
on
Detector
18 μs
OCP
(max)
DCM
VIN_DRV
CHARGE
Functional Block Diagram
¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯
Name
GATE
VBAT
TRIG
GND
PAD
SW
Open collector output, pulls low when output reaches target value and CHARGE is
high. Goes high during charging or whenever CHARGE is low.
IGBT trigger input.
IGBT gate drive output.
Ground connection.
Drain connection of internal DMOS switch. Connect to transformer primary winding.
Connect to battery voltage; directly to select the default output voltage, or through a
series resistor to select a lower output voltage step.
Input voltage. Connect to 3 to 5.5 V bias supply. Decouple V
ceramic capacitor placed close to this pin.
Charge enable and current limit serial programming pin. Set this pin low to
shut down the chip.
Exposed pad for enhanced thermal dissipation. Connect to ground plane.
Capacitor Charger with IGBT Driver
S
R
H
Triggered Timer
t
off
18 μs
Q
Q
(max)
L
Control Logic
Enable
S
R
Q
Q
Function
V IN_DRV
GND
IGBT Driver
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
DMOS
IN
voltage with 0.1 μF
SW
GATE
DONE
3