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参数资料
| 型号： | A8437ECGLT |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 2/22页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CAP CHARGER WLCSP |
| 标准包装： | 24,000 |
| 应用： | 照相机闪光灯电容器充电器，Xenon |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-UFBGA，WLCSP |
| 供应商设备封装： | 12-WLCSP |
| 包装： | 带卷 (TR) |
A8437
Mobile Phone Xenon Photoflash Capacitor Charger
with IGBT Driver
Features and Benefits
? Low quiescent current draw (0.1 μ A in shutdown mode)
? Primary-side output voltage sensing; no resistor divider
required
? User-adjustable current limit from 0.4 to 1.2 A
? 1.1 V logic (V HI (min)) compatibility
? Integrated IGBT driver with separate sink and source (CG
package) or common sink/source (EJ package)
? Flash dual trigger with interlock for increased noise
immunity
? Optimized for mobile phone, 1-cell Li+ battery applications
? No primary-side Schottky diode needed
? Zero-voltage switching for lower loss
? >75% efficiency
? Optional regulation feature to maintain the output voltage
? Charge complete indication
? Integrated 40 V DMOS switch
Packages:
10-contact DFN/MLP
3 mm × 3 mm
0.75 nominal overall height
(Package EJ)
Description
The Allegro ? A8437 Xenon photoflash charger IC is designed
to meet the needs of ultra-low power, small form factor cameras,
particularly camera-phones.
The charge current time is adjustable by setting the charge
current limit from 0.4 to 1.2 A maximum. 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 A8437 features very
low supply current draw—typically 0.1 μ A in shutdown mode
and 10 μ A in standby mode.
The A8437 has a flash dual trigger IGBT driver and flash
interlock to increase the device noise immunity. The IGBT
driver also has separate source and sink connections, for
flexibility in controlling IGBT rise and fall times. The charge
and trigger voltage logic thresholds are set at 1.1 V HI (min)
to support applications implementing low voltage control
logic.
The A8437 is available in a 10-pin, 3 mm × 3 mm DFN/MLP
package with exposed pad for enhanced thermal performance.
For an even smaller PCB footprint, a wafer-level chip scale
package (WLCSP) option is available.
Applications include:
? Mobile phone flash
? Digital and film camera flash
12-ball WLCSP
1.205 mm × 1.635 mm
0.5 nominal overall height
(Package CG)
Typical Application
CG Package
1 : 10
EJ Package
1 : 10
TLIM
C2
Battery Input +
2.3 to 5.5 V
VIN
VOUT Detect
C1
COUT
100 μ F
315 V
C2
Battery Input +
2.3 to 5.5 V
VIN
VOUT Detect
C1
COUT
100 μ F
315 V
SW
SW
ISET
Control
ISET
Control
RSET
Block
I SW sense
Connect
to VIN
RSET
Block
I SW sense
Connect
to VIN
CHARGE
DONE
REG
VPULLUP
Application 1. Typical application
without output voltage regulation.
Note: Application must
CHARGE
DONE
REG
VPULLUP
DONE
100 k Ω
periodically restart the charging
cycle to recover lost charge on
the output capacitor.
VIN
DONE
100 k Ω
TRIGGER1
IGBT Driver
GSOURCE
IGBT Gate
TRIGGER1
IGBT Driver
IGBT Gate
GATE
TRIGGER2
A8437-DS, Rev. 1
GND
GSINK
TRIGGER2
GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8437EEJTR-T | 功能描述:IC PHOTOFLASH CAP CHARGER 10TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| A8438 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438_06 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438_13 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438EEJTR-T | 功能描述:IC PHOTOFLASH CHARGER 10-MLP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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