AAT4252A-3

AAT4252A ANALOGICTECH | Alldatasheet

Document overview

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• PDF pages: 14

Technical content

Features

• V IN Range: 1.5V to 6.5V
• Low R DS(ON) — 87m Ω Typical @ 5V — 196m Ω Typical @ 1.5V
• Slew Rate Turn-On Time Options — 1ms — 0.5µs — 100µs
• Fast Shutdown Load Discharge Option
• Low Quiescent Current — Typically 500nA
• TTL/CMOS Input Logic Level
• Temperature Range: -40ºC to +85°C
• Available in TSOPJW-12 package

Applications

• Cellular Telephones
• Digital Still Cameras
• Notebook Computers
• PDA Phones
• PDAs
• PMPs
• Smartphones Typical Application INA INB OUTA OUTB INA INB ENAENB FAST OUTA OUTB N/C ON/OFF ON/OFF FAST/SLOW 1μF 1μF 0.1μF 0.1μF GND AAT4252A 8,9,10,11

(Top View) FAST INA ENA ENB INB N/C OUTA GND GND GND GND OUTB Pin # Symbol Function 1 FAST Active-high input switches between FAST (Logic H) and SLOW (Logic L) slew rate. 2 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. 3 ENA Active-High Enable Input A. A logic low turns the switch off and the device consumes less than 1µA of current. Logic high resumes normal operation. 4 ENB Active-High Enable Input B. A logic low turns the switch off and the device consumes less than 1µA of current. Logic high resumes normal operation. 5 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. 6 N/C Not connected. 7 OUTB This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1µF capacitor. 8, 9, 10, 11 GND Ground connection. 12 OUTA This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1µF capacitor. AAT4252A Dual Slew Rate Controlled Load Switch 2 4252A.2007.06.1.0

Symbol Description Value Units θJA Thermal Resistance 160 °C/W PD Maximum Power Dissipation 625 mW 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 V IN + 0.3 V IMAX Maximum Continuous Switch Current 1.8 A IDM Maximum Pulsed Current IN ≥ 2.5V 5.5 AIN ≤ 2.5V 2.0 TJ Operating Junction Temperature Range -40 to 150 °C TLEAD Maximum Soldering Temperature (at leads) 300 °C VESD ESD Rating3 - HBM 4000 V Slew Rate (Typ) Active Part Number FAST (H) SLOW (L) Pull-Down Enable AAT4252A-11 1ms NO Active High AAT4252A-21 0.5µs NO Active High AAT4252A-3 100µs 1ms YES Active High AAT4252A Dual Slew Rate Controlled Load Switch 4252A.2007.06.1.0 3 1. Contact Sales for product availability 2. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi- tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 3. Human body model is a 100pF capacitor discharged through a 1.5k Ω resistor into each pin. 4. Mounted on an AAT4252A demo board in still 25°C air.

Electrical Characteristics1 VIN = 5V, TA = -40°C to +85°C unless otherwise noted. Typical values are at T A = 25°C. Per channel. Symbol Description Conditions Min Typ Max Units AAT4252A All Versions VIN Operation Voltage 1.5 6.5 V IQ Quiescent Current ON/OFF = ACTIVE, FAST = VIN, 1.0 µAIOUT = 0 IQ(OFF) Off Supply Current ON/OFF = Inactive, OUT = Open 1.0 µA ISD(OFF) Off Switch Current2 ON/OFF = GND, VOUT = 0 1.0 µA VIN = 5V 87 155 VIN = 4.2V 92 RDS(ON) On-Resistance V IN = 3.0V 103 m Ω VIN = 1.8V 145 VIN = 1.5V 196 TCRRDS On Resistance Temp Co 2800 ppm/°C VIL ON/OFF Input Logic Low Voltage V IN = 1.5V to 5.5V 0.4 V VIH ON/OFF Input Logic High Voltage V IN = 1.5V to 5.5V 1.4 V ISINK ON/OFF Input Leakage V ON/OFF = 5.5V 1.0 µA AAT4252A-12 TD(ON) Output Turn-On Delay Time V IN = 5V, RLOAD =10Ω, TA =25°C 10 40 µs TON Turn-On Rise Time V IN = 5V, RLOAD =10Ω, TA =25°C 600 1500 µs TD(OFF) Output Turn-OFF Delay Time V IN = 5V, RLOAD =10Ω, TA =25°C 2.0 10 µs AAT4252A-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 AAT4252A-3 TD(ON) Output Turn-On Delay Time V IN = 5V, RLOAD =10Ω, TA =25°C 10 40 µs TON Turn-On Rise Time VIN = 5V, RLOAD =10Ω, FAST = 5V, 65 150 µsTA =25°C TON Turn-On Rise Time VIN = 5V, RLOAD =10Ω, FAST = 0V, 600 1500 µsTA =25°C TD(OFF) Output Turn-OFF Delay Time V IN = 5V, RLOAD =10 , TA =25°C 2.0 10 µs RPD Output Pull-Down Resistance ON/OFF = Inactive, TA =25°C 10 50 ΩDuring OFF AAT4252A Dual Slew Rate Controlled Load Switch 4 4252A.2007.06.1.0 1. The AAT4252A is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. Contact Sales for product availability.

VIN = 5V, TA = 25°C unless otherwise noted. On-Resistance vs. Temperature Temperature (°C) On-Resistance (mΩΩ) 100 120 140 -40 -15 10 35 60 85 VIN = 3V VIN = 5V On-Resistance vs. Input Voltage Input Voltage (V) On-Resistance (mΩΩ) 110 130 150 170 190 210 230 250 ISW = 2A ISW = 100mA Off Supply Current vs. Temperature (No Load; EN = GND; VIN = 5V) Temperature (°C) Off Supply Current (µA) -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 Quiescent Current vs. Temperature (No Load; Single Switch) Temperature (°C) Quiescent Current (µµA) 0.5 1.5 2.5 3.5 4.5 -40 -15 10 35 60 85 VIN = 5V VIN = 3V Quiescent Current vs. Input Voltage (No Load; Single Switch) Input Voltage (V) Quiescent Current (µµA) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0123456 AAT4252A Dual Slew Rate Controlled Load Switch 4252A.2007.06.1.0 5

VIN = 5V, TA = 25°C unless otherwise noted. Output Turn-On (RL = 10ΩΩ) Time (500µs/div) Enable Voltage (top) (V) Output Voltage FAST (middle) (V) Output Voltage SLOW (bottom) (V) 567 Output Turn-Off (VIN = 5V; RL = 10ΩΩ) Time (5µs/div) Enable Voltage (top) (V) Output Voltage (middle) (V) Input Current (bottom) (A) 0.1 0.2 0.3 0.40.5 0.6 0.7 Output Turn-On (VIN = 5V; RL = 10ΩΩ) Time (500µs/div) Enable Voltage (top) (V) Output Voltage (middle) (V) Input Current (bottom) (A) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Output Turn-On (VIN = 3V; RL = 20ΩΩ) Time (500µs/div) Enable Voltage (top) (V) Output Voltage (middle) (V) Input Current (bottom) (A) 0.5 1.5 2.5 3.5 0.05 0.1 0.15 0.2 0.25 0.3 0.35 Output Turn-On (VINA/VENA = 5V; VINB/VENB = 3V; RLA = 10ΩΩ; RLB = 20Ω) Time (500µs/div) Enable Voltage (top) (V) Output Voltage (bottom) (V) Switch A Switch B Output Turn-On (VINA/VINB/VEN = 5V; RL = 10ΩΩ) Time (500µs/div) Enable Voltage (top) (V) Output Voltage (bottom) (V) 246 Switch A Switch B AAT4252A Dual Slew Rate Controlled Load Switch 6 4252A.2007.06.1.0

Dual Slew Rate Controlled Load Switch 4252A.2007.06.1.0 7 Typical Characteristics VIN = 5V, TA = 25°C unless otherwise noted. Output Turn-Off (VIN = 3V; RL = 20ΩΩ) Time (5µs/div) Enable Voltage (top) (V) Output Voltage (middle) (V) Input Current (bottom) (A) 0.5 1.5 2.5 3.5 0.05 0.10.15 0.2 0.250.3 0.35

*AAT4252A-3 version only OUTA ENA INA GND Level Shift Turn-On Slew Rate Control OUTB ENB INB Level Shift Turn-On Slew Rate Control FAST AAT4252A Dual Slew Rate Controlled Load Switch 8 4252A.2007.06.1.0

Dual Slew Rate Controlled Load Switch 4252A.2007.06.1.0 9 Functional Description The AAT4252A is a family of flexible dual P-chan- nel MOSFET power switches designed for high- side load switching applications. There are three versions of the AAT4252A with different turn-on and turn-off characteristics to choose from, depending upon the specific requirements of an application. The first version, the AAT4252A-1, has a moderate turn-on slew rate feature, which reduces in-rush current when the MOSFET is turned on. This func- tion 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 cur- rent 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 AAT4252A-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 version, the AAT4252A-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 dis- abled through the ON/OFF pin. Using the FAST input pin on the AAT4252A-3, the device can be manually switched to a slower slew rate. All versions of the AAT4252A 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, mak- ing the AAT4252A an ideal level-shifting load switch. Applications Information Input Capacitor A 1μF or larger capacitor is typically recommended for C IN 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 practically possible. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for C IN. There is no specific capacitor equivalent series resistance (ESR) requirement for C IN. However, for higher current C IN, ceramic capacitors are recommended for CIN due to their inherent capability over tantalum capacitors to with- stand input current surges from low-impedance sources, such as batteries in portable devices. Output Capacitor For proper slew operation, a 0.1μF capacitor or greater is required between V OUT and GND. Likewise, with the output capacitor, there is no spe- cific capacitor ESR requirement. If desired, C OUT may be increased without limit to accommodate any load transient condition without adversely affecting the slew rate. Enable Function The AAT4252A features an enable / disable func- tion. 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 2.0V. The load switch will go into shutdown mode when the voltage on the ON pin falls below 0.8V. When the load switch is in shutdown mode, the OUT pin is tri-stated, and quiescent current drops to leakage levels below 1μA. 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 current flow into

Dual Slew Rate Controlled Load Switch 10 4252A.2007.06.1.0 the VOUT pin, possibly damaging the load switch. In applications where there is a possibility of V OUT exceeding VIN for brief periods of time during nor- mal operation, the use of a larger value CIN capaci- tor is highly recommended. A larger value of C IN with respect to C OUT will effect a slower C IN decay rate during shutdown, thus preventing V OUT from exceeding V IN. In applications 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 V OUT (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 AAT4252A is designed to deliver a continuous output load current. The limiting characteristic for maximum safe operating output load current is package power dissipation. 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 minimum recommended footprint as stated in the Printed Circuit Board Layout Recommendations section of this datasheet. At any given ambient temperature (T A), the maxi- mum package power dissipation can be deter- mined by the following equation: Constants for the AAT4252A are maximum junction temperature (T J(MAX) = 125°C1) and package ther- mal resistance (θJA = 160°C/W). Worst case condi- tions are calculated at the maximum operating tem- perature, T A = 85°C. Typical conditions are calcu- lated under normal ambient conditions where T A = 25°C. At T A = 85°C, P D(MAX) = 250mW. At T A = 25°C, PD(MAX) = 625mW. The maximum continuous output current for the AAT4252A is a function of the package power dis- sipation and the R DS of the MOSFET at TJ(MAX). The maximum RDS of the MOSFET at T J(MAX) is calcu- lated by increasing the maximum room tempera- ture R DS by the R DS temperature coefficient. The temperature coefficient (T C) is 2800ppm/°C. Therefore, at 125°C: RDS(MAX) = RDS(25°C) · (1 + TC ⋅ ΔT) RDS(MAX) = 198mΩ For maximum current, refer to the following equation: For example, if VIN = 5V, RDS(MAX) = 198mΩ, and TA = 25°C, IOUT(MAX) = 1.8A. If the output load current were to exceed 1.8A 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 AAT4252A. 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 below. High Peak Output Current Applications Some applications require the load switch to operate at a continuous nominal current level with short dura- tion, high-current peaks. Refer to the I DM specifica- tion in the Absolute Maximum Ratings table to ensure the AAT4252A’s maximum pulsed current rat- ing 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-cur- rent peak scaled by the duty factor. For example, a 4V system using an AAT4252A operates at a contin- uous 100mA load current level and has short 2A cur- rent peaks, as in a GSM application. The current peak occurs for 576μs out of a 4.61ms period. IOUT(MAX) < PD(MAX) RDS PD(MAX) = TJ(MAX) - TA θJA 1. The actual maximum junction temperature of AAT4252A is 150°C. However,good design practice is to derate the maximum die tem - perature down to 125°C to prevent the possibility of over temperature damage.

First, the current duty cycle is calculated: 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 approximated by consult- ing the chart of R DS(ON) vs. VIN. The R DS reported for 5V at 100mA and 2A can be scaled by the ratio seen in the chart to derive the R DS for 4V V IN at 25°C : 155mΩ · 90mΩ/87mΩ = 160.3mΩ. De-rated for temperature: 160.3mΩ · (1 + 0.002800 x (125°C -25°C)) = 205m Ω. The power dissipation for a 100mA load is calculated as follows: PD(MAX) = IOUT 2 · RDS PD(100mA) = (100mA)2 · 205mΩ PD(100mA) = 2.05mW PD(87.5%D/C) = %DC · PD(100mA) PD(87.5%D/C) = 1.8mW The power dissipation for 100mA load at 87.5% duty cycle is 1.97mW. Now the power dissipation for the remaining 12.5% of the duty cycle at 2A is calculated: P D(MAX) = IOUT 2 · RDS PD(2A) = (2A)2 · 205mΩ PD(2A) = 820.97mW PD(12.5%D/C) = %DC · PD(2A) PD(12.5%D/C) = 102.6mW The power dissipation for 2A load at 12.5% duty cycle is 102.6mW. Finally, the two power figures are summed to determine the total true power dis- sipation under the varied load. P D(total) = PD(100mA) + PD(2A) PD(total) = 1.8mW + 102.6mW PD(total) = 104.4mW The maximum power dissipation for the AAT4252A operating at an ambient temperature of 85°C is 250mW. The device in this example will have a total power dissipation of 104.4mW. This is well within the thermal limits for safe operation of the device; in fact, at 85°C, the AAT4252A will handle a 2A pulse for up to 30% duty cycle. At lower ambi- ent 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 AAT4252A, 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. For best performance, C IN and COUT should be placed close to the package pins. Evaluation Board Layout The AAT4252A evaluation layout follows the print- ed circuit board layout recommendations and can be used for good applications layout. Refer to Figures 1 and 2. Note: Board layout shown is not to scale. % Peak Duty Cycle = % Peak Duty Cycle = x 100 ⎝⎠ = 12.5% 576μs 4.61ms AAT4252A Dual Slew Rate Controlled Load Switch 4252A.2007.06.1.0 11

Figure 1: Evaluation Board Top Side Layout. Figure 2: Evaluation Board Bottom Side Layout. AAT4252A Dual Slew Rate Controlled Load Switch 12 4252A.2007.06.1.0

Ordering Information

Package Information

All dimensions in millimeters. 0.20 + 0.10 - 0.05 0.055 ± 0.045 0.45 ± 0.15 7° NOM 4° ± 4° 3.00 ± 0.10 2.40 ± 0.10 2.85 ± 0.20 0.15 ± 0.05 0.9625 ± 0.0375 1.00 + 0.10 - 0.065

0.04 REF

0.010 2.75 ± 0.25 All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means Device Option Package Marking 1 Part Number (Tape and Reel)2 AAT4252A-3 TSOPJW-12 WSXYY AAT4252AITP-3-T1 AAT4252A Dual Slew Rate Controlled Load Switch 4252A.2007.06.1.0 13 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.

Dual Slew Rate Controlled Load Switch 14 4252A.2007.06.1.0 Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 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 specifications or to discontinue any product or service with- out notice. Except as provided in AnalogicTech’s terms and conditions of sale, AnalogicTech assumes no liability whatsoever, an d AnalogicTech disclaims any express or implied war- ranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a part icular 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 An alogicTech deems necessary to support this warranty. Specific 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 holder s.