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器件描述：USB OTG 5V Charge Pump
器件厂商：ANALOGICTECH [Advanced Analogic Technologies]
厂商主页：http://www.analogictech.com/
文件大小：181.42KB
文件页数：12
PDF阅读：AAT3125.pdf (点击阅读器件资料)
摘要：
AAT3125
USB OTG 5V Charge Pump
3125.2005.12.1.4 1
General Description
The AAT3125 USB On-the-Go (OTG) charge pump
is a member of AnalogicTech's Total Power
Management IC? (TPMIC?) product family. The
device integrates a high efficiency 1.5X fractional
100mA regulated charge pump for supplying V
BUS
with the additional functions required for OTG
devices (formerly known as dual role devices).
Four voltage detectors monitor V
BUS
, and a current
source dedicated for V
BUS
pulsing is provided for
compliance with Session Request Protocol (SRP)
as defined by the USB OTG Supplement.
The charge pump section uses a high efficiency
fractional topology, with a high frequency 750kHz
switching speed which enables the use of small
capacitors (less than 3.3?F). The AAT3125 fea-
tures extremely low quiescent current to extend
battery run time. Additionally, the device integrates
protection features such as under-voltage lockout,
and output short circuit and thermal protection.
The AAT3125 is available in a Pb-free, surface
mount QFN44-16 package and is rated over the
-40°C to +85°C temperature range.
Features
?V
IN
Range: 2.7V to 5.5V
? Regulated Fractional Charge Pump
? 100mA Output Current
? Reverse Load Protection
? Power Good Flag
? SRP Detection Flag
? SRP Ready Flag
? Output Short-Circuit and Thermal Protection
? Under-Voltage Protection
? Less than 1?A Consumed While Disabled
? Designed to Allow Operation with Output
Capacitance as Low as 3.3?F
? 16-pin QFN44 Package
? -40°C to +85°C Temperature Range
Applications
? Cell Phones
? Hand-Held Computers
? PDAs
Typical Application
IN
POK1
GND
SR
OUT
C
OUT
C
IN
1?F
1?F
1?F
1?F
3.3?F to 6.5?F
SR POK2
SESDET
SRRDY
ENEN
R1 R2 R3 R4
POK1
VBUS
POK2
SESDET
SRRDY
AAT3125
1 Cell
Li-Ion
C1
C2
C1+
C1-
C2+
C2-
80k?
C
CP
OUTCP
R
CS
0.2?
ChargePump
?
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