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AAT3125
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 ICTM (TPMICTM) product family. The device integrates a high efficiency 1.5X fractional 100mA regulated charge pump for supplying VBUS with the additional functions required for OTG devices (formerly known as dual role devices). Four voltage detectors monitor VBUS, and a current source dedicated for VBUS 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 3.3F). The AAT3125 features 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 -40C to +85C temperature range.
Features
* * * * * * * * * * * * *
ChargePumpTM
VIN 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 1A Consumed While Disabled Designed to Allow Operation with Output Capacitance as Low as 3.3F 16-pin QFN44 Package -40C to +85C Temperature Range
Applications
* * * Cell Phones Hand-Held Computers PDAs
Typical Application
IN OUT
1 Cell Li-Ion
CIN
1F
AAT3125
C1+ C1OUTCP
RCS
0.2
80k
VBUS COUT
3.3F to 6.5F
C1 1F
C2+ C2-
CCP
1F R1 R2 R3 R4
C2 1F SR EN
SR EN GND
POK1 POK2 SESDET SRRDY
POK1 POK2 SESDET SRRDY
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AAT3125
USB OTG 5V Charge Pump Pin Descriptions
Pin #
1
Symbol
POK1
Function
Power OK 1. Open drain output with 4.0V voltage detector. When the OUT pin rises above the detected voltage (4.0V), POK1 will transition from low to high state. Similarly, when the output falls below 4.0V, POK1 will transition from high to low. A 10k pull-up resistor is recommended. Power OK 2. Open drain output with 4.4V voltage detector. When the OUT pin rises above the detected voltage (4.4V), POK2 will transition from low to high state. Similarly, when the output falls below 4.4V, POK2 will transition from high to low. A 10k pull-up resistor is recommended. Session detect. Open drain output with 2.0V voltage detector. When the OUT pin rises above the detected voltage (2.0V), it will transition from low to high state. Similarly, when the output falls below 2.0V, SESDET will transition from high to low. A 10k pull-up resistor is recommended. Session request ready. Open drain output with 0.6V voltage detector. When the OUT pin rises above the detected voltage (0.6V), it will transition from low to high state. Similarly, when the output falls below 0.6V, SRRDY will transition from high to low. A 10k pull-up resistor is recommended. Power output to VBUS. Flying capacitor 1 positive terminal. Flying capacitor 1 negative terminal. No connect. Charge pump output. Requires 1F bypass capacitor to ground. Flying capacitor 2 positive terminal. Flying capacitor 2 negative terminal. Ground. Input power supply. Requires 1F bypass capacitor to ground. Session request input control pin. Should not be left floating. Must connect to high or low. For more details, see Table 1. Enable input control pin. When in the low state, the AAT3125 is powered down and consumes a small amount of power. When connected high, it is in normal operation. This pin should not be left floating. For more details, see Table 1. Exposed paddle (bottom); connect to GND directly beneath package.
2
POK2
3
SESDET
4
SRRDY
5 6 7 8, 13 9 10 11 12 14 15 16
OUT C1+ C1N/C OUTCP C2+ C2GND VIN SR EN
EP
Pin Configuration
QFN44-16 (Top View) N/C VIN
14 13
EN
16
SR
15
POK1 POK2 SESDET SRRDY
1
12
GND C2C2+ OUTCP
2
11
3
10
4 5 6 7 8
9
C1+ OUT
N/C C1-
2
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AAT3125
USB OTG 5V Charge Pump Absolute Maximum Ratings1
Symbol
VIN, VOUT tSC IOUT2 TJ TS VESD
Description
Any Pin to GND OUT Short-Circuit Duration Output Current Operating Temperature Range Storage Temperature Range ESD Rating3 - HBM
Value
-0.3 to 6 Indefinite 150 -40 to 85 -65 to 150 2000
Units
V s mA C C V
Thermal Information
Symbol
JA PD
Description
Maximum Thermal Resistance Maximum Power Dissipation (TA = 25C)5
4
Value
50 2.0
Units
C/W W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Based on long-term current density limitation. 3. Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. 4. Mounted on an FR4 board. 5. Derate 20mW/C above 25C. 3125.2005.12.1.4
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AAT3125
USB OTG 5V Charge Pump Electrical Characteristics1
VIN = 3.5V; CIN = COUT = C1 = C2 = 1.0F; TA = -40C to +85C. Unless otherwise noted, typical values are TA = 25C. Symbol
Input Power Supply VIN Operating Range Icc3 Icc2 Icc1 Icc0 Output Power Supply VOUT ICCOUT IOUT VCS ROFF ISR Charge Pump TSS FCLK EN, SR VIL VIH IEN(SINK) ISR(SINK) POK1 VPOK1 VPOK1(HYS) VPOK1(OL) IPOK1 POK2 VPOK2 VPOK2(HYS) VPOK2(OL) IPOK2
Description
Conditions
Min
2.9
Typ
Max
5.5 110 3 2 1 5.25 12
Units
V A mA A A V A mA
Operating Current SRP Operating Current CP Shutdown Current 1 Shutdown Current 0 Output Regulation Operating Current Output Current Current Sense Trip Level Pull-Down Resistance SR Current Pulse Efficiency Soft-Start Time Clock Frequency Input Threshold Low Input Threshold High EN Input Current SR Input Current POK Trip Threshold POK Hysteresis POK Output Voltage POK Leakage Current POK Trip Threshold POK Hysteresis POK Output Voltage POK Leakage Current
EN EN EN EN
= = = =
1, 1, 0, 0,
SR SR SR SR
= = = =
1, OUT = IN 0 1 0 4.6 50 40 700 5
60 1 1
IOUT = 0 EN = 0 3.2 VIN 5.5V, VOUT > 4.4V 3.35 VIN 5.5V, VOUT > 4.4V VCS = IOUT x RCS EN = 0, SR = 1 OUT < (IN-1.0v) VIN = 3.75V, IOUT = 50mA OUT < 0.1 to OUT > 4.4
7 65 100 60 1000 10 90 100 750
90 1500 20
mV mA % s kHz
0.4 VIN = VEN = 5.5V VIN = VSR = 5.5V VOUT Rising ISINK = 1mA VPOK = 5.5, 25C VOUT Rising ISINK = 1mA VPOK = 5.5, 25C 4.18 4.4 50 1.4 -1 -1 3.8 4.0 50 1 1 4.2 0.3 100 4.62 0.3 100
V V A A V mV V nA V mV V nA
1. The AAT3125 is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is assured by design, characterization, and correlation with statistical process controls.
4
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AAT3125
USB OTG 5V Charge Pump Electrical Characteristics1
VIN = 3.5V; CIN = COUT = C1 = C2 = 1.0F; TA = -40C to +85C. Unless otherwise noted, typical values are TA = 25C. Symbol
SESDET VSD VSD(HYS) VSD(OL) ISD SRRDY VSRRDY VSRRDY(HYS) VSRRDY(OL) ISRRDY
Description
SD Trip Threshold SD Hysteresis SD Output Voltage SD Leakage Current SRRDY Trip Threshold SRRDY Hysteresis SRRDY Output Voltage SRRDY Leakage Current
Conditions
VOUT Rising ISINK = 1mA VSD = 5.5, 25C VOUT Rising ISINK = 1mA VSRRDY = 5.5, 25C
Min
1.9
Typ
2.0 50
Max
2.1 0.3 100
Units
V mV V nA V mV V nA
0.4
0.6 20
0.8 0.3 100
EN
1 1 0 0
SR
0 1 0 1
Charge Pump
ON OFF OFF OFF
Current Source
OFF ON OFF OFF
SRRDY
ON ON OFF OFF
POK
ON ON OFF OFF
SESDET
ON ON ON ON
Discharge Resistor
OFF OFF OFF ON
Table 1: Operational States.
1. The AAT3125 is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 3125.2005.12.1.4
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AAT3125
USB OTG 5V Charge Pump Typical Characteristics
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1F, TA = 25C.
Charge Pump ON/OFF Timing
100 90
Efficiency vs. Load Current
VIN = 3.4V
Efficiency (%)
OUT (1V/div)
80 70 60 50 40 30 20 10 0 1 10 100 1000
VIN = 3.8V
IIN (100mA/div) EN (1V/div) Time (2ms/div)
Load Current (mA)
Charge Pump Waveforms
(100mA load)
Load Transient Response
(10mA to 100mA)
IN
VOUT (100mV/div) V (10mV/div)
OUT Time (1s/div) Time (4ms/div)
Charge Pump Output Voltage vs. Load Current
Charge Pump Output Voltage (V)
5.5
Charge Pump Output Voltage vs. Input Voltage
(ILOAD = 100mA)
6
Output Voltage (V)
1000
5 4 3 2 1 0 0 1 2 3 4 5
5.3 5.1 4.9 4.7 4.5 1 10 100
VIN = 3.9V
VIN = 3.7V
Load Current (mA)
Input Voltage (V)
6
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AAT3125
USB OTG 5V Charge Pump Typical Characteristics
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1F, TA = 25C.
Operating Current vs. Input Voltage
(EN = 1; SR = 0; Charge Pump Mode)
1.200 1.000 0.800 80 70 60
Operating Current vs. Input Voltage
(EN = 1; SR = 0; Outside Current Source Mode)
ICC2 (mA)
50
ICC3 (A)
0.600 0.400 0.200 0.000 0 1 2 3 4 5 6
40 30 20 10 0 0 1 2 3 4 5
Input Voltage (V)
Input Voltage (V)
Shutdown Current vs. Input Voltage
(EN = 0; SR = 1)
1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 1 2 3 4 5 6 10 9 8 7 6 5 4 3 2 1 0 0 1
ICCOUT vs. VOUT
ICCOUT (A)
ICC1 (A)
2
3
4
5
6
Input Voltage (V)
Output Voltage (V)
ISR vs. VOUT
(EN = 1; SR = 1)
15
Charge Pump POK Timing
OUT (5V/div) EN (2V/div) ISR (mA) VIN = 4.2V
10
POK2 (5V/div) POK1 (5V/div)
VIN = 3.2V
5 0 1 2 3 4
SESDET (5V/div) SRRDY (5V/div)
Output Voltage (V)
Time (100s/div)
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AAT3125
USB OTG 5V Charge Pump Typical Characteristics
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1F, TA = 25C.
Falling SESDET Timing
Rising SESDET, SRRDY Timing
(120F Load)
OUT (5V/div) EN/SR (5V/div) SESDET (5V/div)
OUT (5V/div) EN, SR (5V/div) SESDET (5V/div) SRRDY (5V/div)
Time (100ms/div)
Time (10ms/div)
(VBUS Rise Time; 5F on VBUS)
4 4
VBUS Pulsing for SRP
(VBUS Rise Time; 100F on VBUS)
VBUS Pulsing for SRP
3
3
VBUS (V)
2
VBUS (V)
2
1
1
0
0
Time (1ms/div)
Time (10ms/div)
8
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AAT3125
USB OTG 5V Charge Pump Functional Block Diagram
C1+ C1- C2+ C2-
IN
5V Charge Pump
OC
OUTCP OUT POK1
10mA
SR EN
4.0
Control UVLO OTMP
4.4
POK2 SESDET
2.0
Voltage Reference
SRRDY
0.6
GND
Functional Description
Charge Pump
The AAT3125 charge pump uses a 1.5X topology; the two flying capacitors are charged in series and discharged in parallel. Using this topology, output current is approximately 2/3 input current. Since the power bus in battery-operated devices that use a single cell lithium-ion/polymer battery ranges from 3V to 4.5V, an output voltage above 4.4V can be maintained. Output voltage is regulated to 5V and output current is limited by the value of RCS. The charge pump is designed to operate safely with any combination of input and output voltages. Current is not allowed to flow from OUT to IN.
10mA, SESDET should rise about 7ms after SRRDY rises when an OTG device is connected. With a non-OTG device connected, this period is at least 70ms. 10mA should not damage non-SRP capable hosts that allow reverse current flow from the bus. Current is not allowed to flow from OUT to IN through the current source.
SESDET MicroPower Voltage Detector
The SESDET open drain output signals the use of SRP while the system is acting as the A device. OUT powers this detector because the local 5V bus may not be powered when the B device initiates SRP. Since VBUS provides no more than 150A to OUT, the detector consumes only 7A.
10mA Current Source
A 10mA current source supplies current to OUT for VBUS pulsing during SRP. During VBUS pulsing, the length of time needed to charge capacitance connected to OUT distinguishes between non-SRP capable devices and SRP capable devices. Using
SRRDY Voltage Detector
The SRRDY open drain output signals that VBUS is ready for SRP. SRRDY is powered by IN and is active as long as IN is above the UVLO level. SRRDY is true (low) when OUT is below the SRRDY threshold (0.6V nominal). SRRDY is false
3125.2005.12.1.4
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AAT3125
USB OTG 5V Charge Pump
(open) when OUT is above the SRRDY threshold or when EN is a logic low. Upon activation by EN, there is no negative glitch that can be mistaken for OUT below 0.8V.
Under-Voltage Lockout
Circuits other than the MicroPower voltage detector (SESDET) require voltage to be present on IN. Under-voltage lockout guarantees that sufficient voltage is present on IN to ensure operation. All functions other than the SESDET flag are disabled if the voltage on IN is less than 2V.
Power OK
USB OTG devices connected as Host must maintain VOUT above 4.4 volts or report that it is below 4.4 volts. Two Power OK outputs (POK1 and POK2) provide a window comparison of the VOUT voltage. The POK1 open drain output is pulled low if VOUT drops below 4.0V 5%, and the POK2 open drain output is pulled low if VOUT drops below 4.4V 5%.
Discharge Resistor
In accordance with the USB OTG specification, a pull-down resistor is provided to discharge VBUS at a current of not more than 8mA.
Over-Temperature Protection
If the AAT3125 junction temperature exceeds 125C, the charge pump is shut down.
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AAT3125
USB OTG 5V Charge Pump Ordering Information
Package
QFN44-16
Marking1
ITXYY
Part Number (Tape and Reel)2
AAT3125ISN-T1
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
QFN44-16
0.600 0.050
Pin 1 Dot By Marking
0.330 0.050
13 16
Pin 1 Identification
0.650 BSC
1
4.000 0.050
R0.030Max
9 4
8
5
4.000 0.050
2.280 REF
Top View
Bottom View
2.400 0.050
0.0125 0.0125
0.203 0.025
Side View
All dimensions in millimeters.
1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3125.2005.12.1.4
0.900 0.050
0.450 0.050
11
AAT3125
USB OTG 5V Charge Pump
(c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech's standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 12
3125.2005.12.1.4

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