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USB OTG 5V Charge Pump General Description
The AAT3125 USB On-the-Go (OTG) Charge Pump is a member of AnalogicTechTM's Total Power ManagementTM IC 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, are 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 undervoltage lockout, output short circuit and thermal protection. The AAT3125 is available in a surface mount QFN16 package, and is rated from -40C to 85C.
AAT3125
Features
* * * * * * * * * * *
ChargePumpTM
Regulated Fractional Charge Pump 100 mA 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 4x4mm QFN package
Applications
* * * Cell Phones Hand Held Computers PDAs
Typical Application
IN OUT
1 Cell LiION
CIN
1F
AAT3125
C1+ C1OUTCP
RCS
0.2
80k
VBUS COUT
3.3F to 6.5F
C1 1F C2 1F SR EN
C2+ C2-
CCP
1F R1 R2 R3 R4
POK1 SR EN GND POK2 SESDET SRRDY
POK1 POK2 SESDET SRRDY
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USB OTG 5V Charge Pump Pin Descriptions
Pin #
1
AAT3125
Symbol
POK1
Function
Power OK 1. Open drain output with 4.0V voltage detector. When the OUT pin rises above the detected Voltage (4.0 V), POK1 will transition from low to high state. Similarly, when the output falls below 4.0 Volts, POK1 will transition from high to low. A 10 K 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 (4.4 V), POK2 will transition from low to high state. Similarly, when the output falls below 4.4 Volts, POK2 will transition from high to low. A 10 K pull up resistor is recommended. Session detect. Open drain output with 2.0V voltage detector. When the OUT pin rises above the detected Voltage (2.0 V), it will transition from low to high state. Similarly, when the output falls below 2.0 Volts, SESDET will transition from high to low. A 10 K 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 (0.6 V), it will transition from low to high state. Similarly, when the output falls below 0.6 Volts, SRRDY will transition from high to low. A 10 K pull up resistor is recommended. Power output to VBUS Flying Capacitor 1 + terminal Flying Capacitor 1 - terminal No Connect Charge pump output. Requires 1F bypass capacitor to ground. Flying Capacitor 2 + terminal Flying Capacitor 2 - terminal Ground No Connect 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, AAT3125 is powered down, and consumes 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.
2
POK2
3
SESDET
4
SRRDY
5 6 7 8 9 10 11 12 13 14 15 16
OUT C1+ C1NC OUTCP C2+ C2GND NC VIN SR EN
Pin Configuration
16 LD 4x4 QFN NC 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
NC C1-
2
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USB OTG 5V Charge Pump Absolute Maximum Ratings1
Symbol
VIN, VOUT tSC IOUT(2) TJ TS VESD
AAT3125
Description
Any Pin to GND OUT short circuit duration Output Current Operation temp. range Storage temp. 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
Notes: 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.
Thermal Information
Symbol
JA PD
Description
Thermal Resistance Maximum Power Dissipation (TA = 25C)
4 5
Value
50 2
Units
C/W W
Note 4: Mounted on an FR4 board. Note 5: Derate 20mW/C above 25C.
Electrical Characteristics1
VIN = 3.5V; CIN = COUT = C1 = C2 = 1.0F; TA = -40 to 85C. Unless otherwise noted, typical values are TA = 25C Symbol
Input Power Supply VIN operation range Icc3 Icc2 Icc1 Icc0 Output Power Supply VOUT ICCOUT IOUT VCS Roff ISR Charge Pump Ts Fclk
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
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
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USB OTG 5V Charge Pump Electrical Characteristics1
VIN = 3.5V; CIN = COUT = C1 = C2 = 1.0F; TA = -40 to 85C. Unless otherwise noted, typical values are TA = 25C Symbol
EN, SR VIL VIH IEN(SINK) ISR(SINK) POK1 VPOK1 VPOK1(HYS) VPOK1(OL) IPOK1 POK2 VPOK2 VPOK2(HYS) VPOK2(OL) IPOK2 SESDET VSD VSD(HYS) VSD(OL) ISD SRRDY VSRRDY VSRRDY(HYS) VSRRDY(OL) ISRRDY
AAT3125
Description
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 SD Trip Threshold SD Hysteresis SD output voltage SD Leakage Current SRRDY Trip Threshold SRRDY Hysteresis SRRDY output voltage SRRDY Leakage Current
Conditions
Min
Typ
Max
0.4
Units
V V A A V mV V nA V mV V nA V mV V nA V mV V nA
VIN = VEN = 5.5V VIN = VSR = 5.5V VOUT Rising ISINK = 1mA VPOK = 5.5, 25C VOUT Rising ISINK = 1mA VPOK = 5.5, 25C VOUT Rising ISINK = 1mA VSD = 5.5, 25C VOUT Rising ISINK = 1mA VSRRDY = 5.5, 25C
1.4 -1 -1 3.8 4.0 50
1 1 4.2 0.3 100
4.18
4.4 50
4.62 0.3 100
1.9
2.0 50
2.1 0.3 100
0.4
0.6 20
0.8 0.3 100
Note 1: The AAT3125 is guaranteed to meet performance specification over the -40 to +85C operating temperature range, and are assured by design, characterization and correlation with statistical process controls.
Table 1: Operational States
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
4
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USB OTG 5V Charge Pump Typical Characteristics
(Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1F, TA = 25C
AAT3125
Charge Pump ON/OFF Timing
100%
Efficiency vs. Load Current
VIN = 3.4V
Efficiency (%)
OUT (1V/div)
90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 1
VIN = 3.8V
IIN (100mA/div) EN (1V/div) Time (2ms/div)
10
100
1000
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 5.3 5.1 4.9 4.7 4.5 1 10 100 1000
Charge Pump Output Voltage vs. Input Voltage ILOAD = 100mA
6
Output Voltage (V)
5 4 3 2 1 0 0 1 2 3 4 5
VIN = 3.9V
VIN = 3.7V
Load Current (mA)
VIN (V)
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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
AAT3125
Operating Current vs. Input Voltage EN = 1, SR = 0 (Outside Current Source Mode)
80 70 60
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
VIN (V)
VIN (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
VIN (V)
VOUT (V)
ISR vs. OUT EN = 1, SR = 1
15
Charge Pump POK Timing
OUT (5V/div) ISR (mA) VIN = 4.2V
10
EN (2V/div) POK2 (5V/div) POK1 (5V/div)
VIN = 3.2V
5 0 1 2 3 4
SESDET (5V/div) SRRDY (5V/div)
OUT (V)
Time (100s/div)
6
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USB OTG 5V Charge Pump Typical Characteristics
(Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1F, TA = 25C Falling SESDET Timing
AAT3125
Rising SESDET, SRRDY Timing 120F Load
OUT (5V/div) EN, SR (5V/div) SESDET (5V/div) SRRDY (5V/div)
OUT (5V/div) EN/SR (5V/div) SESDET (5V/div)
Time (100ms/div)
Time (10ms/div)
VBUS Pulsing for SRP VBUS Risetime, 5F on VBUS
4 4
VBUS Pulsing for SRP VBUS Risetime, 100F on VBUS
3
3
VBUS (V)
2
VBUS (V)
2
1
1
0
0
1ms/div
10ms/div
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USB OTG 5V Charge Pump Functional Block Diagram
C1+ C1- C2+ C2-
AAT3125
IN
5V Charge Pump
OC
OUTCP OUT POK1
10mA
SR EN
Control UVLO OTMP
4.0
POK2
4.4
SESDET
2.0
Voltage Reference
SRRDY
0.6
GND
Functional Description
Charge Pump
The charge pump uses a 1.5 X 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 battery ranges from 3 V to 4.5 V, output voltage above 4.4 V can be maintained. Output voltage is regulated to 5 V 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.
SRRDY rises when an OTG device is connected. With a non-OTG device connected, this period is at least 70 ms. 10 mA 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 (Micro Power 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 5 V 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.
10 mA Current Source
A 10 mA 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 10 mA, SESDET should rise about 7 ms after 8
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 nom). SRRDY is false
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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.
AAT3125
Under voltage lockout
Circuits other than the micro power voltage detector (SESDET) require voltage to be present on IN. Under voltage lockout (UVLO) guarantees that sufficient voltage is present on IN to insure 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 pulldown 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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USB OTG 5V Charge Pump Ordering Information
Package QFN44-16 Marking1 ITXYY Part Number (Tape and Reel) AAT3125ISN-T1
AAT3125
Note: Sample stock is held on part numbers listed in bold. Note 1: XYY = assembly and date code.
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.
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, and advise customers 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 10
3125.2004.08.1.2
0.900 0.050
0.450 0.050

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