AAT3125 Datasheet, PDF (1/12 Pages) Advanced Analogic Technologies – USB OTG 5V Charge Pump

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 3.3µF). 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.
AAT3125
USB OTG 5V Charge Pump
Features
ChargePump^™
• 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 1µA Consumed While Disabled
• Designed to Allow Operation with Output
Capacitance as Low as 3.3µF
• 16-pin QFN44 Package
• -40°C to +85°C Temperature Range
Applications
• Cell Phones
• Hand-Held Computers
• PDAs
Typical Application
1 Cell
Li-Ion
IN
OUT
AAT3125
C_IN
C1+
1µF
C1-
OUTCP
C1 ^1µF
C2+
C2-
C2 1µF
POK1
SR
SR
POK2
EN
EN
SESDET
GND
SRRDY
R_CS
0.2Ω
80kΩ
VBUS
C_OUT
3.3µF to 6.5µF
C_CP
1µF
R1 R2 R3 R4
POK1
POK2
SESDET
SRRDY
3125.2005.12.1.4
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