NMOSFET. AF2039 Datasheet

AF2039 NMOSFET. Datasheet pdf. Equivalent

AF2039 Datasheet
Recommendation AF2039 Datasheet
Part AF2039
Description NMOSFET
Feature AF2039; AF2039 Features l Min1.6V Startup @1mA Load l 600mV Feedback Voltage l 550KHz Internal Oscillator l .
Manufacture AFSEMI
Datasheet
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AFSEMI AF2039
AF2039
Features
l Min1.6V Startup @1mA Load
l 600mV Feedback Voltage
l 550KHz Internal Oscillator
l Soft Startup: 10mS Typical
l Peak Current Programmable by Bottom Sensing Resistor
l 300µA Typical Iq
l Internal PWM/PFM Auto Mode Switching
l Up to 90% Efficiency
l External Enable
l Power OFF Current<1µA
l Over Voltage Protection
l 140Thermal Shut Down, 20Hysteresis
Applications
l USB Charger
General Description
The AF2039 using the external NMOSFET. It is a high efficiency boost converter with 600mV feedback voltage. A
switching frequency of 550KHz minimizes solution footprint by allowing the use of tiny low profile inductors and ceramic
capacitors. The current mode PWM/PFM design is internally compensated, and the device has a 1.6V startup voltage with
1mA load. It needs few external components, only inductance, resistance and capacitance can meet the driving capacity.
Block Diagram
AF-V1.0
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AFSEMI AF2039
Pin Assignment
Pin
1
2
3
4
5
Symbol
FB
VDD
CE
GND
EXT
Description
Feedback pin of the device
Input Voltage
Chip Enable
Ground
Power MOSFET Gate Driver
AF2039
Absolute Maximum Ratings
Power Supply Voltage ..................... 2.8V to 8.5V
Feedback Voltage ............................600mV
Quiescent Current .................. 450uA
Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum Ratingsmay
cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the
specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Thermal Information
Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires special
attention to power dissipation. Many system-dependent issue such as thermal coupling, airflow, added heat sinks and
convection surfaces, and the presence of other heat-generating components affect the power-dissipation limits of a given
component.
Three basic approaches for enhancing thermal performance follow.
l Improving the power dissipation capability of the PCB design
l Improving the thermal coupling of the component to the PCB
l Introducing airflow in the system
AF-V1.0
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AFSEMI AF2039
Electrical Characteristics
AF2039
(VDD = 5 VTa = 25, Unless otherwise specified)
PARAMETER
Power Supply Voltage for
normal operation
Min Input Startup Voltage
Input Startup Voltage with
Heavy Load
Min Input Hold Voltage
Feedback Voltage
Feedback Voltage
Temperature Coefficient
Feedback Voltage Supply
Regulation
Load Regulation
Quiescent Current
OFF current
Oscillator Frequency
Max Duty
Duty boundary for PWM/PFM
Current Limit Set Voltage
DRV PMOS On Resistor
DRV NMOS On Resistor
DRV PMOS Max Output
Current
DRV NMOS MAX Output
Current
FB OVP Threshold
FB OVP Hysteresis
TSD Threshold
TSD Hysteresis
EN High Level
EN Low Level
Soft Start Time
SYMB
OL
VDD
VST1
VST2
VHLD
VFB
VFBTC
Vreg
Ireg
Iq
Ioff
fosc
Dmax
Dmin
Vlim
Ronp
Ronn
Imaxp
Imaxn
Vovp
Vophys
TSD
TSDhy
s
VH
VL
Tss
MIN
2.8
0.9
1
TYP MAX UNITS
CONDITION
7 V For normal operation after start-up
1.6 V 1mA load, VDD tied to VOUT
2.6 V VDD tied to VOUT
V VDD tied to VOUT
600 mV
130 ppm/
0.2 %/V Close Loop. Varying VDD by
adjusting Resistor Divider Ratio
0.3 %/A
350 uA No Switching
1 uA
550 KHz
90 %
15 %
250 mV
10 Ohm Min measured at 3V VDD
7.5 Ohm Min measured at 3V VDD
230 mA Min measured at 3V VDD
190 mA Min measured at 3V VDD
720 mV Measured at FB
100 mV Measured at FB
140 degc
20 degc
V
0.3 V
10 mS VIN=1.5V,VOUT=5VLOAD=1mA
AF-V1.0
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