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Allegro Micro Systems

A8732 Datasheet Preview

A8732 Datasheet

Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger

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A8732www.DataSheet4U.com
Ultra Small Mobile Phone Xenon Photoflash
Capacitor Charger with IGBT Driver
Features and Benefits
Ultra small 2 × 2 DFN/MLP-8 package
Low quiescent current draw (0.5 μA max. in shutdown mode)
Primary-side output voltage sensing; no resistor divider required
Adjustable switch peak current limit up to 1.5 A with
single-wire programming through the CHARGE pin
1V logic (VHI(min)) compatibility
Integrated IGBT driver with internal gate resistors
Optimized for mobile phone, 1-cell Li+ battery applications
Zero-voltage switching for lower loss
>75% efficiency
Charge complete indication
Integrated 50 V DMOS switch with self-clamping
protection
Package: 8-pin DFN/MLP (suffix EE)
Description
The Allegro® A8732 is a Xenon photoflash charger IC designed
to meet the needs of ultra low power, small form factor cameras,
particularly camera phones. By using primary-side voltage
sensing, the need for a secondary-side resistive voltage divider
is eliminated. This has the additional benefit of reducing leakage
currents on the secondary side of the transformer. To extend
battery life, the A8732 features very low supply current draw
(0.5 μA max in shutdown mode). The switch current limit can
be programmed from 0.45 to 1.5 A, in 16 steps with single wire
interface, through the CHARGE pin.
The IGBT driver also has internal gate resistors for minimum
external component count. The charge and trigger voltage
logic thresholds are set at 1 VHI(min) to support applications
implementing low-voltage control logic.
The A8732 is available in an 8-contact 2 mm × 2 mm
DFN/MLP package with a 0.60 maximum overall package
height, and an exposed pad for enhanced thermal performance.
It is lead (Pb) free with 100% matte tin leadframe plating.
Not to scale
2 mm × 2 mm, 0.60 mm height
VIN_VDRV
C2
CHARGE
TRIG
Typical Applications
Battery Input +
2.3 to 5.5 V
C1
VBAT
VOUT Detect
SW
Control
Block
ISW sense
COUT
100F
315 V
VPULLUP
DONE
100 kΩ
DONE
VIN_VDRV
IGBT Driver
IGBT Gate
GATE
VIN_VDRV
C2
CHARGE
TRIG
Battery Input +
1.5 to 5.5 V
C1
VBAT
VOUT Detect
SW
Control
Block
ISW sense
COUT
100F
315 V
VPULLUP
DONE
100 kΩ
DONE
VIN_VDRV
IGBT Driver
IGBT Gate
GATE
GND
GND
(A)
Figure 1. Typical applications: (A) with single battery supply and (B) with separate bias supply
(B)
8732-DS




Allegro Micro Systems

A8732 Datasheet Preview

A8732 Datasheet

Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger

No Preview Available !

A8732
Ultra Small Mobile Phone Xenon Photoflashwww.DataSheet4U.com
Capacitor Charger with IGBT Driver
Selection Guide
Part Number
A8732EEETR-T
Packing
3000 pieces per reel
Package
8-contact DFN/MLP with exposed thermal pad
Absolute Maximum Ratings
Characteristic
SW Pin
VIN_DRV, VBAT Pins
CHARGE, TRIG, ¯D¯¯O¯¯N¯¯E¯ Pins
Remaining Pins
Operating Ambient Temperature
Maximum Junction
Storage Temperature
Symbol
VSW
ISW
VIN
TA
TJ(max)
Tstg
Notes
DC voltage.
(VSW is self-clamped by internal active clamp
and is allowed to exceed 50 V during flyback
spike durations. Maximum repetitive energy
during flyback spike: 0.5 μJ at frequency
400 kHz.)
DC current, pulse width = 1 ms
Care should be taken to limit the current when
–0.6 V is applied to these pins.
Range E
Rating
–0.3 to 50
3
–0.3 to 6.0
–0.6 to VIN + 0.3 V
–0.3 to VIN + 0.3 V
–40 to 85
150
–55 to 150
Units
V
A
V
V
V
ºC
ºC
ºC
THERMAL CHARACTERISTICS may require derating at maximum conditions
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
RθJA 4-layer PCB, based on JEDEC standard
*Additional thermal information available on Allegro Web site.
Value Units
49 ºC/W
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A8732
Description Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger
Maker Allegro Micro Systems
Total Page 20 Pages
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