AAT4280A-4

AAT4280A_08 ANALOGICTECH | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 16

Technical content

Features

• 1.5V to 5.5V Input Voltage Range
• Very Low R DS(ON), Typically 80mΩ (5V)
• Slew Rate Limited Turn-On Time Options ▪ 4.5ms ▪ 1ms ▪ 0.5 μs ▪ 100 μs
• Fast Shutdown Load Discharge Option
• Low Quiescent Current ▪ 25nA (typ)
• TTL/CMOS Input Logic Level
• Temperature Range: -40ºC to +85°C
• 3kV ESD Rating
• SC70JW-8 and SOT23-6 Packages

Applications

• Cellular Telephones
• Digital Still Cameras
• Hot Swap Supplies
• LCD Panels
• Notebook Computers
• Personal Communication Devices
• Personal Digital Assistants (PDAs) Typical Application AAT4280A COUT 0.1µF CIN 1µF OUTIN GND VOUT GNDGND VIN ON/OFF GND IN ON

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Pin Descriptions Pin # Symbol Function 1, 5, 6, 7, 8 IN This pin is the input to the P-channel MOSFET source. Bypass to ground through a 1.0 μF capacitor. 2 OUT This pin is the P-channel MOSFET drain connection. Bypass to ground through a 0.1 μF capacitor. 3 ON/OFF Enable input. 4 GND Ground connection. Pin Configuration SC70JW-8 SOT23-6 (Top View) (Top View) OUT ON/OFF GND IN IN IN IN IN 1 GND IN GND INON/OFF OUT 1 3 4

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Selector Guide Part Number Slew Rate (typ) Active Pull Down Enable AAT4280A-1 1ms Active High AAT4280A-2 0.5 μs Active High AAT4280A-3 100 μs ✓ Active High AAT4280A-4 4.5ms ✓ Active High Absolute Maximum Ratings1 TA = 25°C, unless otherwise noted. Symbol Description Value Units VIN IN to GND -0.3 to 6 V VON ON/OFF to GND -0.3 to 6 V VOUT OUT to GND -0.3 to V IN + 0.3 V IMAX Maximum Continuous Switch Current 2.3 A IDM Maximum Pulsed Current IN ≥ 2.5V 6 A IN < 2.5V 3 A TJ Operating Junction Temperature Range -40 to 150 °C TS Storage Temperature Range -65 to 150 °C TLEAD Maximum Soldering Temperature (at leads) 300 °C VESD ESD Rating2 - HBM 3000 V Thermal Characteristics3 Symbol Description Value Units ΘJA Thermal Resistance 140 °C/W PD Power Dissipation 714 mW 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at c onditions 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 an AAT4280A demo board in still 25°C air.

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET

Electrical Characteristics

Unless otherwise noted, VIN = 5V, TA = -40°C to +85°C; typical values are T A = 25°C. Symbol Description Conditions Min Typ Max Units AAT4280A All Versions VIN Operation Voltage 1.5 5.5 V IQ Quiescent Current ON/OFF = Active 1 μA IQ(off) Off Supply Current ON/OFF = Inactive, OUT = Open 1 μA ISD(off) Off Switch Current ON/OFF = Inactive, VOUT = 0 1 μAVIN = 5V, TA = 25°C 80 120 VIN = 4.2V, TA = 25°C 85 130 RDS(on) On Resistance VIN = 3V, TA = 25°C 100 150 mΩVIN = 1.8V, TA = 25°C 160 250 VIN = 1.5V, TA = 25°C 200 300 TCRDS On Resistance Temperature Coeffi cient 2800 ppm/°C ISINK ON/OFF Input Leakage VON/OFF = 5.5V 1 μA AAT4280A-1 TD(ON) Output Turn-On Delay V IN = 5V, RLOAD = 10Ω, TA = 25°C 20 40 μs TON Output 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 10 μs AAT4280A-2 TD(ON) Output Turn-On Delay V IN = 5V, RLOAD = 10Ω, TA = 25°C 0.5 2 μs TON Output Turn-On Rise Time V IN = 5V, RLOAD = 10Ω, TA = 25°C 0.5 1 μs TD(OFF) Output Turn-Off Delay Time V IN = 5V, RLOAD = 10Ω, TA = 25°C 4 10 μs AAT4280A-3 TD(ON) Output Turn-On Delay V IN = 5V, RLOAD = 10Ω, TA = 25°C 20 40 μs TON Output Turn-On Rise Time V IN = 5V, RLOAD = 10Ω, TA = 25°C 100 150 μs TD(OFF) Output Turn-Off Delay Time V IN = 5V, RLOAD = 10Ω, TA = 25°C 4 10 μs RPD Output Pull-Down Resistance During OFF ON/OFF = Inactive, TA = 25°C 150 250 Ω AAT4280A-4 TD(ON) Output Turn-On Delay Time V IN = 3.3V, RLOAD = 10Ω, TA = 25°C 20 40 μs TON Output Turn-On Rise Time V IN = 3.3V, RLOAD = 10Ω, TA = 25°C 2000 4500 μs TD(OFF) Output Turn-OFF Delay Time V IN = 3.3V, RLOAD = 10Ω, TA =25°C 4 10 μs RPD Output Pull-Down Resistance During OFF ON/OFF = Inactive, TA = 25°C 150 250 Ω 1. For VIN outside this range, consult typical ON/OFF threshold curve.

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Typical Characteristics Unless otherwise noted, VIN = 5V, TA = 25°C. Quiescent Current vs. Temperature Temperature (°°C) Quiescent Current (nA) -40 -20 0 20 40 60 80 100 RDS(ON) vs. Input Voltage Input Voltage (V) RDS(ON) (mΩΩ) 110 130 150 170 190 210 230 250 270 500mA 100mA RDS(ON) vs. Temperature 100 110 120 -40 -20 0 20 40 60 80 100 Temperature (°C) RDS(ON) (mΩ) VIN = 5V VIN = 3V ON/OFF Threshold vs. Input Voltage Input Voltage (V) ON/OFF Threshold (V)0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 VIH VIL Off-Switch Current vs. Temperature 0.001 0.010 0.100 1.000 -40 -20 0 20 40 60 80 100 Temperature (°C) Off-Switch Current (μA)

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Typical Characteristics—AAT4280A-1 Unless otherwise noted, VIN = 5V, TA = 25°C. AAT4280A-1 Turn-On (VIN = 3V; RL = 6Ω) Time (500μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-1 Turn-On (VIN = 5V; RL = 10Ω) Time (500μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-1 Turn-Off (VIN = 3V; RL = 6Ω) Time (10μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-1 Turn-Off (VIN = 5V; RL = 10Ω) Time (10μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div)

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Typical Characteristics—AAT4280A-2 Unless otherwise noted, VIN = 5V, TA = 25°C. AAT4280A-2 Turn-On (VIN = 3V; RIN = 6Ω) Time (5μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-2 Turn-On (VIN = 5V; RL = 10Ω) Time (5μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-2 Turn-Off (VIN = 3V; RL = 6Ω) Time (5μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-2 Turn-Off (VIN = 5V; RL = 10Ω) Time (5μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div)

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Typical Characteristics—AAT4280A-3 Unless otherwise noted, VIN = 5V, TA = 25°C. AAT4280A-3 Turn-On (VIN = 3V; RL = 6Ω) Time (50μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-3 Turn-On (VIN = 5V; RL = 10Ω) Time (50μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-3 Turn-Off (VIN = 3V; RL = 6Ω) Time (5μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-3 Turn-Off (VIN = 5V; RL = 10Ω) Time (5μs/div) ON/OFF (5V/div) VOUT (2V/div) IIN (200mA/div)

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Typical Characteristics—AAT4280A-4 Unless otherwise noted, VIN = 5V, TA = 25°C. AAT4280A-4 Turn-On (VIN = 3V; RL = 10ΩΩ) Time (2ms/div) EN (2V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-4 Turn-On (VIN = 5V; RL = 10ΩΩ) Time (2ms/div) EN (5V/div) VOUT (5V/div) IIN (500mA/div) AAT4280A-4 Turn-Off (VIN = 3.3V; RL = 10WW) Time (10µs/div) EN (2V/div) VOUT (2V/div) IIN (200mA/div) AAT4280A-4 Turn-Off (VIN = 5V; RL = 10ΩΩ) Time (10µs/div) EN (5V/div) VOUT (5V/div) IIN (500mA/div)

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Functional Description The AAT4280A is a family of flexible P-channel MOSFET power switches designed for high-side load switching applications. There are three versions of the AAT4280A with different turn-on and turn-off characteristics to choose from, depending upon the specific requirements of an application. The first version, the AAT4280A-1, has a moderate turn-on slew rate feature, which reduces inrush 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 condi- tion. 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 R DS(ON) is minimized. The second version, the AAT4280A-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 third switch version, the AAT4280A-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. The final switch version, the AAT4280A-4, features a very slow turn-on slew rate with a typical value of 4.5ms for LCD panel applications. All versions of the AAT4280A operate with input voltages ranging from 1.5V to 5.5V. All versions of this device have extremely low operating current, making them ideal for battery-powered applications. The ON/OFF con- trol pin is TTL compatible and will also function with 2.5V to 5V logic systems, making the AAT4280A an ideal level-shifting load switch. Functional Block Diagram Level Shift IN ON/OFF OUT GND Turn-On Slew Rate Control *AAT4280A-3 and -4 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, CIN is useful in preventing load transients from affecting upstream circuits. C IN should be located as close to the device VIN pin as practi- cally possible. Ceramic, tantalum, or aluminum electro- lytic capacitors may be selected for C IN. There is no specific capacitor ESR requirement for C IN; however, for higher current operation, ceramic capacitors are recom- mended for C IN due to their inherent capability over tan- talum 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 between V OUT and GND is recommended. The output capacitor has no specific capacitor type or ESR require- ment. If desired, C OUT may be increased without limit to accommodate any load transient condition without adversely affecting the device turn-on slew rate time. Enable Function The AAT4280A features an enable / disable function. This pin (ON/OFF) is compatible with both TTL or CMOS logic. 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 para- sitic diode. Conditions where V OUT might exceed VIN should be avoided since this would forward bias the internal para- sitic diode and allow excessive current flow into the V OUT pin and possibly damage 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 AAT4280A 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 need to be taken into account. The following discussions will assume the load switch is mounted on a printed circuit board utilizing the minimum recommended footprint, as stated in the Layout Considerations 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 AAT4280A are maximum junction tem- perature, T J(MAX) = 125°C, and package thermal resis- tance, ΘJA = 120°C/W. Worst case conditions are calcu- lated at the maximum operating temperature where TA = 85°C. Typical conditions are calculated under normal ambient conditions where T A = 25°C. At T A = 85°C, PD(MAX) = 333mW. At TA = 25°C, PD(MAX) = 833mW. The maximum continuous output current for the AAT4280A 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 TJ(MAX) is calculated by increasing the maximum room temperature RDS by the R DS temperature coefficient. The temperature coefficient (TC) is 2800ppm/°C. Therefore, MAX RDS125°C = RDS25°C · (1 + TC · ΔT) MAX RDS125°C = 120mΩ · (1 + 0.0028 · For maximum current, refer to the following equation: IOUT(MAX) PD(MAX) RDS

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET For example, if V IN = 5V, R DS(MAX) = 154m Ω and T A = 25°C, IOUT(MAX) = 2.3A. If the output load current were to exceed 2.3A 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 AAT4280A. To accomplish this, the device thermal resistance must be reduced by increasing the heat sink area or by oper- ating the load switch in a duty-cycle manner. 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. The duty cycle for both output cur- rent levels must be taken into account. To do so, first calculate the power dissipation at the nominal continu- ous current level, and then add in the additional power dissipation due to the short duration, high-current peak scaled by the duty factor. For example, a 4V system using an AAT4280A operates at a continuous 100mA load current level and has short 2A 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: X/100 = 576μs/4.61ms % Peak Duty Cycle = 12.5% The load current is 100mA for 87.5% of the 4.61ms period and 2A for 12.5% of the period. Since the Electrical Characteristics do not report R DS(MAX) for 4V operation, it must be calculated approximately by con- sulting the chart of R DS(ON) vs. VIN. The R DS reported for 5V can be scaled by the ratio seen in the chart to derive the R DS for a 4V V IN: 120mΩ · 87m Ω /80mΩ = 130m Ω. De-rated for temperature: 130mΩ · (1 + 0.0028 · (125°C - 25°C)) = 166m Ω. The power dissipation for a 100mA load is calculated as follows: PD(MAX) = IOUT2 · RDS PD(100mA) = (100mA)2 · 166mW PD(100mA) = 1.66mW PD(87.5%D/C) = %DC · PD(100mA) PD(87.5%D/C) = 1.45mW The power dissipation for 100mA load at 87.5% duty cycle is 1.45mW. Now the power dissipation for the remaining 12.5% of the duty cycle at 2A is calculated: P D(MAX) = IOUT2 · RDS PD(2A) = (2A)2 · 166mΩ PD(2A) = 664mW PD(12.5%D/C) = %DC · PD(2A) PD(12.5%D/C) = 83mW The power dissipation for 2A load at 12.5% duty cycle is 83mW. Finally, the two power figures are summed to determine the total true power dissipation under the varied load: P D(total) = PD(100mA) + PD(2A) PD(total) = 1.45mW + 83mW PD(total) = 84.5mW The maximum power dissipation for the AAT4280A oper- ating at an ambient temperature of 85°C is 333mW. The device in this example will have a total power dissipation of 84.5mW. This is well within the thermal limits for safe operation of the device; in fact, at 85°C, the AAT4280A will handle a 2A pulse for up to 50% duty cycle. At lower ambient temperatures, the duty cycle can be further increased. Printed Circuit Board Layout Recommendations For proper thermal management and to take advantage of the low R DS(ON) of the AAT4280A, a few circuit board layout rules should be followed: V IN and V OUT should be routed using wider than normal traces, and GND should be connected to a ground plane. To maximize package thermal dispation and power handling capacity of the AAT4280A SC70JW-8 package, the ground plane area connected to the ground pins should be made as large as possible. For best performance, C IN and COUT should be placed close to the package pins. Evaluation Board Layout The AAT4280A evaluation layout follows the printed cir- cuit board layout recommendations and can be used for good applications layout. Refer to Figures 1 through 3. Note: Board layout shown is not to scale.

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET

Ordering Information

Device Option Package Marking 1 Part Number (Tape and Reel)2 AAT4280A-1 SC70JW-8 NDXYY AAT4280AIJS-1-T1 AAT4280A-2 SC70JW-8 NEXYY AAT4280AIJS-2-T1 AAT4280A-3 SC70JW-8 NFXYY AAT4280AIJS-3-T1 AAT4280A-4 SC70JW-8 3EXYY AAT4280AIJS-4-T1 AAT4280A-4 SOT23-6 3LXYY AAT4280AIGU-4-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 Information

0.225 ± 0.075 0.45 ± 0.10 0.05 ± 0.05 2.10 ± 0.30 2.00 ± 0.20 7° ± 3° 4° ± 4° 0.15 ± 0.05

1.10 MAX

0.100 2.20 ± 0.20 0.048REF 0.50 BSC 0.50 BSC 0.50 BSC All dimensions in millimeters. 1. XYY = assembly and date code. 2. Sample stock is generally held for part numbers listed in BOLD.

Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET AAT4280A Slew Rate Controlled Load SwitchSmartSwitch TM PRODUCT DATASHEET Advanced Analogic Technologies, Inc.

3230 Scott Boulevard, Santa Clara, CA 95054

Phone (408) 737-4600 Fax (408) 737-4611 © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech pr oduct. 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 specifi cations or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fi tness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specifi c testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. SOT23-6

1.90 BSC

0.95 BSC

0.45 ± 0.15 0.10 BSC 2.85 ± 0.15 0.075 ± 0.075 0.40 ± 0.10 × 6 1.575 ± 0.125 1.20 ± 0.25 1.10 ± 0.20 2.80 ± 0.20 4° ± 4° 10° ± 5° 0.15 ± 0.07 GAUGE PLANE

0.60 REF

All dimensions in millimeters.