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参数资料
| 型号： | MAX8819AETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/29页 |
| 文件大小： | 0K |
| 描述： | IC PMIC W/INT CHARGER 28TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 手持/移动设备 |
| 电源电压： | 4.1 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
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PMIC with Integrated Chargers and Smart
Power Selector in a 4mm x 4mm TQFN
I FS = FB 4 , where V FB 4 = 0 . 5 V no min ally
4) EN4 to turn on the display’s backlight.
5) CEN is asserted by the μP to start a charge cycle.
6) The external supply is removed from DC and V SYS
falls. The regulators remain enabled because EN123
and EN4 are asserted, but the battery charging cur-
rent drops to zero even though CEN is still asserted.
CHG goes high-impedance.
7) System is turned off by deasserting EN123, EN4,
and CEN. OUT1, OUT2, and OUT3 power down in
the opposite order of power-up. RST1 goes low to
reset the μP.
Step-Up Converter (REG4)
The step-up converter (REG4) operates by regulating
the voltage at FB4 to 0.5V. REG4 operates from the
system voltage (V SYS ); this voltage can vary from 2.6V to
4.35V (MAX8819A/MAX8819C) or 5.3V (MAX8819B). The
1MHz switching frequency allows for tiny external com-
ponents. The step-up converter control scheme opti-
mizes the efficiency while achieving low EMI and low
input ripple.
If the step-up converter (REG4) is not needed, disable
REG4 by grounding EN4, LX4, PG4, and OVP4. COMP4
can be unconnected.
REG4 WLED Driver Configuration
Figure 1 shows that REG4 is configured as a white light
emitting diodes (WLED) driver, typically used to drive
up to six devices with an output voltage up to 24V. The
full-scale current is set by resistor R1, according to the
following relationship:
V
R 1
I FS < 0 . 5 V / 16 Ω = 30 . 9 mA
STEP
0
1
2
3
4
5
28
29
30
31
32
33
EN4
t HI_INIT
> 100 μ s
t HI
t SHDN
27/32
t SOFT-START
FULL
31/32
30/32 29/32
500ns TO 500 μ s
28/32
t LO
> 500ns
FULL
31/32
2ms (typ)
I LED
SHUTDOWN
6/32
5/32
4/32
3/32
2/32
1/32
SHUTDOWN
Figure 8. Dimming Control Timing Diagram
Table 4. REG4 Recommended Inductors
MANUFACTURER
TOKO
FDK
SERIES
DE2812C
DB3018C
MIP3226
INDUCTANCE
(μH)
10
10
10
ESR (m Ω )
290
240
160
CURRENT
RATING (mA)
580
630
900
DIMENSIONS (mm)
3.0 x 2.8 x 1.2 = (10.8mm) 3
3.2 x 3.2 x 1.8 = (18.4mm) 3
3.2 x 2.6 x 1 = (8.32mm) 3
Table 5. REG4 Recommended Diodes
MANUFACTURER
Central Semiconductor
NXP
ON Semiconductor
PART NUMBER
CMDSH05-4
CMHSH5-4
PMEG3005EB
MBR0530L
CONTINUOUS
CURRENT
(mA)
500
500
500
500
FORWARD VOLTAGE
(mV)
470
510
500
430
BREAKDOWN
VOLTAGE
(V)
40
40
30
30
PACKAGE
SOD-323
SOD-123
SOD-523
SOD-123
26
______________________________________________________________________________________
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| MAX8819AEVKIT+ | 功能描述:PMIC 解决方案 Evaluation Kit for the MAX8819A MAX8819B MAX8819C and MAX8819D RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8819BETI+ | 功能描述:PMIC 解决方案 PMIC w/Charger & Smart Power Selector RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8819BETI+T | 功能描述:PMIC 解决方案 PMIC w/Charger & Smart Power Selector RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8819CETI+ | 功能描述:PMIC 解决方案 PMIC w/Charger & Smart Power Selector RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8819CETI+T | 功能描述:PMIC 解决方案 PMIC w/Charger & Smart Power Selector RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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