AAT4282A

AAT4282A_08 ANALOGICTECH | Alldatasheet

Document overview

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Technical content

Features

• V IN Range: 1.5V to 6.5V
• Low R DS(ON) ▪ 60m Ω Typical @ 5V ▪ 140m Ω Typical @ 1.5V
• Slew Rate Turn-On Time Options ▪ 1ms ▪ 0.5 μs ▪ 100 μs
• Fast Shutdown Load Discharge Option
• Low Quiescent Current ▪ Typically 1 μA
• TTL/CMOS Input Logic Level
• Temperature Range -40°C to 85°C
• FTDFN22-8 Package

Applications

• Cellular Telephones
• Digital Still Cameras
• Hotswap Supplies
• Notebook Computers
• PDA Phones
• PDAs
• PMPs
• Smartphones Typical Application INA INB OUTA OUTB INA INB ENA ENB FAST OUTA OUTB N/C ON/OFF FAST/SLOW 1μF 1μF C3 0.1μF 0.1μFGND ON/OFF AAT4282A

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4282A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Pin Descriptions Pin # Symbol Function 1 INA This is the pin to the P-channel MOSFET source for Switch A. Bypass to ground through a 1μF capacitor. INA is independent of INB 2 ENA Active-High Enable Input A. A logic low turns the switch off and the device consumes less than 1μA of cur- rent. Logic high resumes normal operation. 3 ENB Active-High Enable Input B. A logic low turns the switch off and the device consumes less than 1μA of cur- rent. Logic high resumes normal operation. 4 INB This is the pin to the P-channel MOSFET source for Switch B. Bypass to ground through a 1μF capacitor. INB is independent of INA. 5 OUTB This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1 μF capacitor.

6 GND Ground connection

7 FAST Active-high input Switches between FAST (Logic H) and SLOW (Logic L) Slew rate

8 OUTA This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1 μF capacitor. Pin Configuration FTDFN22-8 (Top View) ENB INB INA ENA GND OUTB OUTA FAST

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4282A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Selector Guide Part Number Slew Rate (Typ) Active Pull-Down EnableFAST (H) SLOW (L) AAT4282A-1* 1ms NO Active High AAT4282A-2* 0.5 μs NO Active High AAT4282A-3 100 μs 1ms YES Active High Absolute Maximum Ratings1 Symbol Description Value Units VIN IN to GND -0.3 to 7 V VEN, FAST EN, FAST to GND -0.3 to 7 V VOUT OUT to GND -0.3 to VIN + 0.3 V IMAX Maximum Continuous Switch Current 3 A IDM Maximum Pulsed Current (Duty Cycle ≤ 10%) 5.5 A TJ Operating Junction Temperature Range -40 to 150 °C TLEAD Maximum Soldering Temperature (at leads) 300 °C VESD ESD Rating2 – HBM 4000 V Thermal Characteristics3 Symbol Description Value Units θJA Thermal Resistance 70 °C/W PD Maximum Power Dissipation 1.78 W 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at co nditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Human body model is a 100pF capacitor discharged through a 1.5k Ω resistor into each pin. 3. Mounted on a AAT4282A demo board in still 25°C air.

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4282A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Electrical Characteristics1 VIN = 5V, TA = -40 to 85°C unless otherwise noted. Typical values are at T A = 25°C. Per channel. Symbol Description Conditions Min Typ Max Units AAT4282A All Versions VIN Operation Voltage 1.5 6.5 V IQ Quiescent Current ON/OFF = ACTIVE, FAST = V IN, IOUT = 0 1.0 μA IQ(OFF) Off Supply Current ON/OFF = Inactive, OUT = Open 1.0 μA ISD(OFF) Off Switch Current ON/OFF = GND, V OUT = 0 1.0 μA RDS(ON) On-Resistance A or B VIN = 6.5V 56 mΩ VIN = 5V 60 130 VIN = 4.2V 65 140 VIN = 3.0V 76 160 VIN = 1.80V 110 230 VIN = 1.5V 140 280 TCRRDS On Resistance Temperature Coeffi cient 2800 ppm/°C VIL ON/OFF Input Logic Low Voltage V IN = 1.5V 0.4 V VIH ON/OFF Input Logic High Voltage V IN = 5V 1.4 V ISINK ON/OFF Input Leakage V ON/OFF = 5.5V 1.0 μA AAT4282A-12 TD(ON) Output Turn-On Delay Time V IN = 5V, RLOAD =10Ω, TA =25°C 20 40 μs TON Turn-On Rise Time V IN = 5V, RLOAD =10Ω, TA =25°C 1000 1500 μs TD(OFF) Output Turn-OFF Delay Time V IN = 5V, RLOAD =10Ω, TA =25°C 4.0 10 μs AAT4282A-22 TD(ON) Output Turn-On Delay Time V IN = 5V, RLOAD =10Ω, TA =25°C 0.5 2 μs TON Turn-On Rise Time V IN = 5V, RLOAD =10Ω, TA =25°C 0.5 1.0 μs TD(OFF) Output Turn-OFF Delay Time V IN = 5V, RLOAD =10Ω, TA =25°C 4.0 10 μs AAT4282A-3 TD(ON) Output Turn-On Delay Time V IN = 5V, RLOAD =10Ω, TA =25°C 20 40 μs TON Turn-On Rise Time V IN = 5V, RLOAD =10Ω, FAST = 5V, TA =25°C 100 150 μs TON Turn-On Rise Time V IN = 5V, RLOAD =10Ω, FAST = 0V, TA =25°C 1000 1500 μs TD(OFF) Output Turn-OFF Delay Time V IN = 5V, RLOAD =10Ω, TA =25°C 4.0 10 μs RPD Output Pull-Down Resistance During OFF ON/OFF = Inactive, T A =25°C 150 250 Ω 1. The AAT4282A is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is ass ured by design, characterization, and cor- relation with statistical process controls. 2. Contact factory for other turn on and delay options.

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4282A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Typical Characteristics VIN = 5V, TA = 25°C unless otherwise noted. Quiescent Current vs. Temperature (No Load; Single Switch) Temperature (°C) Quiescent Current (µA) -40 -15 10 35 60 85 VIN = 5V VIN = 3V Quiescent Current vs. Input Voltage (No Load; Single Switch) Input Voltage (V) Quiescent Current (µA) 0123456 Off Supply Current vs. Temperature (No Load; EN = GND; VIN = 5V) Temperature (°C) Off Supply Current (µA) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 -40 -15 10 35 60 85 Typical ON/OFF Threshold vs. Input Voltage Input Voltage (V) ON/OFF Threshold (V) 0.6 0.7 0.8 0.9 1.1 1.2 1.3 VIH VIL On-Resistance vs. Temperature Temperature (°C) On-Resistance (mΩΩ) 100 -40 -15 10 35 60 85 VIN = 3V VIN = 5V On-Resistance vs. Input Voltage Input Voltage (V) On-Resistance (mΩΩ) 100 120 140 160 180 200 220 ISW = 2A ISW = 100mA

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4282A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Typical Characteristics VIN = 5V, TA = 25ºC unless otherwise noted. Output Turn-On Delay Time (VINA/VENA = 5V; VINB/VENB = 3V; RLA = 10ΩΩ; RLB = 20Ω) Time (50µs/div) Output Voltage Channel A (top) (V) Output Voltage Channel B (bottom) (V) ENA ENB VOUT VOUT Output Turn-On Delay Time (VINA/VINB/VEN = 5V; RL = 10ΩΩ) Time (50µs/div) Output Voltage Channel A (top) (V) Output Voltage Channel B (bottom) (V) ENA ENB VOUT VOUT Output Turn-On Delay Time (VIN = 5V; RL = 10ΩΩ) Time (50µs/div) Voltage (top) (V) Current (bottom) (A) 0.5 EN VOUT IIN Output Turn-On Delay Time (VIN = 3V; RL = 20ΩΩ) Time (50µs/div) Voltage (top) (V) Current (bottom) (A) 0.2 0.4 EN VOUT IIN Output Turn-On (RL = 10ΩΩ) Time (500µs/div) Voltage (V) EN VOUT (FAST = VIN) VOUT (FAST = GND) Output Turn-On (VIN = 1.8V; RL = 10ΩΩ) Time (200µs/div) Voltage (V) -0.5 0.5 1.5 2.5 3.5 VEN VOUT (FAST = VIN) VOUT (FAST = GND)

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4282A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Typical Characteristics VIN = 5V, TA = 25ºC unless otherwise noted. Output Turn-Off Delay Time (VIN = 5V; RL = 10ΩΩ) Time (5µs/div) Voltage (top) (V) Current (bottom) (A) 0.2 0.4 0.6 0.8 1.2 EN IIN VOUT Output Turn-Off Delay Time (VIN = 3V; RL = 20ΩΩ) Time (5µs/div) Voltage (top) (V) Current (bottom) (A) 0.2 0.4 EN IIN VOUT Output Turn-Off Delay Time (VIN = 1.8V; RL = 10ΩΩ) Time (5µs/div) Enable Voltage (top) (V) Output Voltage (bottom) (V) VEN -0.5 0.5 1.5 2.5 3.5 VOUT

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4282A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Functional Description The AAT4282A is a family of flexible dual P-channel MOSFET power switches designed for high-side load switching applications. There are three versions of the AAT4282A with different turn-on and turn-off character- istics to choose from, depending upon the specific requirements of an application. The first version, the AAT4282A-1, has a moderate turn-on slew rate feature, which reduces in-rush current when the MOSFET is turned on. This function allows the load switch to be implemented with either a small input capacitor or no input capacitor at all. During turn-on slewing, the current ramps linearly until it reaches the level required for the output load condition. The proprietary turn-on current control method works by careful control and monitoring of the MOSFET gate voltage. When the device is switched ON, the gate voltage is quickly increased to the threshold level of the MOSFET. Once at this level, the current begins to slew as the gate voltage is slowly increased until the MOSFET becomes fully enhanced. Once it has reached this point the gate is quickly increased to the full input voltage and the R DS(ON) is minimized. The second version, the AAT4282A-2, is a very fast switch intended for high-speed switching applications. This version has no turn-on slew rate control and no special output discharge features. The final switch ver- sion, the AAT4282A-3, has the addition of a minimized slew rate limited turn-on function and a shutdown output discharge circuit to rapidly turn off a load when the load switch is disabled through the ON/OFF pin. Using the FAST input pin on the AAT4282A-3, the device can be manually switched to a slower slew rate. All versions of the AAT4282A operate with input voltages ranging from 1.5V to 6.5V. All versions of this device have extremely low operating current, making them ideal for battery-powered applications. The ON/OFF control pin is TTL compatible and will also function with 2.5V to 5V logic systems, making the AAT4282A an ideal level-shifting load switch. Functional Block Diagram OUTA ON/OFF A INA GND Level Shift Turn-On Slew Rate Control OUTB ON/OFF B INB Level Shift Turn-On Slew Rate Control FAST/ SLOW * AAT4282A-3 version only.

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Applications Information Input Capacitor A 1μF or larger capacitor is typically recommended for CIN in most applications. A C IN capacitor is not required for basic operation; however, it is useful in preventing load transients from affecting upstream circuits. C IN should be located as close to the device VIN pin as prac- tically possible. Ceramic, tantalum, or aluminum electro- lytic capacitors may be selected for C IN. There is no specific capacitor equivalent series resistance (ESR) requirement for C IN. However, for higher current opera- tion, ceramic capacitors are recommended for CIN due to their inherent capability over tantalum capacitors to withstand input current surges from low-impedance sources, such as batteries in portable devices. Output Capacitor For proper slew operation, a 0.1 μF capacitor or greater is required between VOUT and GND. Likewise, with the output capacitor, there is no specific capacitor ESR requirement. If desired, C OUT may be increased without limit to accommodate any load transient condition with- out adversely affecting the slew rate. Enable Function The AAT4282A features an enable / disable function. This pin (ON) is active high and is compatible with TTL or CMOS logic. To assure the load switch will turn on, the ON control level must be greater than 1.4V. The load switch will go into shutdown mode when the voltage on the ON pin falls below 0.4V. When the load switch is in shutdown mode, the OUT pin is tri-stated, and quiescent current drops to leakage levels below 1 μA. Reverse Output-to-Input Voltage Conditions and Protection Under normal operating conditions, a parasitic diode exists between the output and input of the load switch. The input voltage should always remain greater than the output load voltage, maintaining a reverse bias on the internal parasitic diode. Conditions where V OUT might exceed VIN should be avoided since this would forward bias the internal parasitic diode and allow excessive cur- rent flow into the VOUT pin, possibly damaging the load switch. In applications where there is a possibility of V OUT exceeding V IN for brief periods of time during normal operation, the use of a larger value C IN capacitor is highly recommended. A larger value of C IN with respect to COUT will effect a slower C IN decay rate during shut- down, thus preventing VOUT from exceeding VIN. In appli- cations where there is a greater danger of VOUT exceeding VIN for extended periods of time, it is recommended to place a Schottky diode from V IN to VOUT (connecting the cathode to V IN and anode to V OUT). The Schottky diode forward voltage should be less than 0.45V. Thermal Considerations and High Output Current Applications The AAT4282A is designed to deliver a continuous output load current. The limiting characteristic for maximum safe operating output load current is package power dis- sipation. In order to obtain high operating currents, careful device layout and circuit operating conditions must be taken into account. The following discussions will assume the load switch is mounted on a printed circuit board utilizing the mini- mum recommended footprint as stated in the Printed Circuit Board Layout Recommendations section of this datasheet. At any given ambient temperature (T A), the maximum package power dissipation can be determined by the fol- lowing equation: PD(MAX) TJ(MAX) - TA θJA Constants for the AAT4282A are maximum junction tem- perature (TJ(MAX) = 125°C) 1 and package thermal resis- tance (θJA = 70°C/W). Worst case conditions are calcu- lated at the maximum operating temperature, T A = 85°C. Typical conditions are calculated under normal ambient conditions where T A = 25°C. At T A = 85°C, PD(MAX) = 571mW. At TA = 25°C, PD(MAX) = 1429mW. 1. The actual maximum junction temperature of AAT4282A is 150°C. However, good design practice is to derate the maximum die tem perature to 125°C to prevent the possibil- ity of over-temperature damage.

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET The maximum continuous output current for the AAT4282A is a function of the package power dissipation and the R DS of the MOSFET at TJ(MAX). The maximum RDS of the MOSFET at T J(MAX) is calculated by increasing the maximum room temperature RDS by the RDS temperature coefficient. The temperature coefficient (TC) is 2800ppm/°C. Therefore, at 125°C: RDS(MAX) = RDS(25°C) · (1 + TC · ΔT)Ω RDS(MAX) = 166.4mΩ For maximum current, refer to the following equation: IOUT(MAX) PD(MAX) RDS For example, if V IN = 5V, RDS(MAX) = 166.4m Ω, and TA = 25°C, IOUT(MAX) = 2.93A. If the output load current were to exceed 2.93A or if the ambient temperature were to increase, the internal die temperature would increase and the device would be damaged. Higher peak currents can be obtained with the AAT4282A. To accomplish this, the device thermal resistance must be reduced by increasing the heat sink area or by operating the load switch in a duty cycle manner. Duty cycles with peaks less than 2ms in duration can be considered using the method described in the High Peak Current Applications section of this datasheet. High Peak Output Current Applications Some applications require the load switch to operate at a continuous nominal current level with short duration, high-current peaks. Refer to the I DM specification in the maximum pulsed current rating is not exceeded. The duty cycle for both output current levels must be taken into account. To do so, first calculate the power dissipation at the nominal continuous current level, and then add the additional power dissipation due to the short duration, high-current peak scaled by the duty factor. For example, a 4V system using an AAT4282A which has channel A operates at a continuous 1A load current level, and chan- nel B operates at a continuous 100mA load current level and has short 3A current peaks, as in a GSM application. The current peak occurs for 576μs out of a 4.61ms period. First, the current duty cycle is calculated: % Peak Duty Cycle = % Peak Duty Cycle = x 100 ⎝⎠ = 12.5% 576μs 4.61ms The load current is 100mA for 87.5% of the 4.61ms period and 3A for 12.5% of the period. Since the Electrical Characteristics do not report R DS(MAX) for 4V operation, it must be approximated by consulting the chart of R DS(ON) vs. VIN. The RDS reported for 5V at 100mA and 3A can be scaled by the ratio seen in the chart to derive the R DS for 4V VIN at 25°C: 130mΩ · 63mΩ/60mΩ = 136.5mΩ. De-rated for temperature: 136.5mΩ · (1 + For channel A, the power dissipation for a continuous 1A load is calculated as follows: PD(CHA) = IOUT2 · RDS = (1A)2 · 174.7mΩ = 174.7mW For channel B, the power dissipation for 100mA load is calculated as follows: PD(MAX) = IOUT2 · RDS PD(100mA) = (100mA)2 · 174.7mΩ PD(100mA) = 1.75mW PD(87.5%D/C) = %DC · PD(100mA) PD(87.5%D/C) = 1.53mW The power dissipation for 100mA load at 87.5% duty cycle is 1.53mW. Now the power dissipation for the remaining 12.5% of the duty cycle at 3A is calculated: PD(MAX) = IOUT2 · RDS PD(3A) = (3A)2 · 174.7mΩ PD(3A) = 1572mW PD(12.5%D/C) = %DC · PD(3A) PD(12.5%D/C) = 196.7mW

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4282A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET

Ordering Information

Device Option Package Marking 1 Part Number (Tape and Reel)2 AAT4282A-3 FTDFN22-8 WKXYY AAT4282AIPS-3-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/about/quality.aspx. Package Information3 FTDFN22-8 2.000 ± 0.050 Index Area 2.000 ± 0.050 Top View 0.500 ± 0.050 Detail "A" 0.400 ± 0.050 Pin 1 Identification 0.000 + 0.100 - 0.000 Side View 0.230 ± 0.050 0.750 ± 0.050 Bottom View 0.450 ± 0.0500.250 ± 0.050 Detail "A" All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3. The leadless package family, which includes QFN, TQFN, DFN, FTDFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufactur- ing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom sold er connection.

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4282A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Advanced Analogic Technologies, Inc.

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