AAT4280IGU-2-T1

AAT4280 ANALOGICTECH | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 14

Technical content

Features

• 1.8V to 5.5V Input voltage range
• Very Low R DS(ON), typically 80mΩ (5V)
• Slew rate limited turn-on time options
• 1 m s
• 0.5µs
• 100µs
• Fast shutdown load discharge option
• Low quiescent current
• 2.5µAtyp
• 1µAmax in shutdown
• TTL/CMOS input logic level
• Temperature range -40ºC to 85°C
• 4kV ESD rating
• 6 pin SOT23 or SC70JW-8 package

Applications

• Cellular telephones
• Digital still cameras
• Personal digital assistants (PDA)
• Hot swap supplies
• Notebook computers
• Personal communication devices AAT4280 Slew Rate Controlled Load Switch Typical Application AAT4280 COUT 0.1µF CIN 1µF OUTIN GND VOUT GNDGND VIN ON/OFF GND IN ON Preliminary Information 4280.2002.2.0.92 1

(Top View) SC70JW-8 (Top View) Selector Guide Slew Rate Active Part Number (typ) Pull Down Enable AAT4280-1 1mS Active High AAT4280-2 0.5µS Active High AAT4280-3 100µS √ Active High OUT ON/OFF GND 1 2 IN IN IN IN IN 1 OUT ON/OFF GND 6 IN GND IN Pin # SOT23-6 SC70JW Symbol Function 1 2 OUT The pin is the P-channel MOSFETdrain connection. Bypass to ground through a 0.1uF capacitor. 2,5 4 GND Ground connection 3 3 ON/OFF Enable Input 4,6 1,5,6,7,8 IN The pin is the input to the P-channel MOSFETsource. Bypass to ground through a 1.0uF capacitor. AAT4280 Slew Rate Controlled Load Switch 2 4280.2002.2.0.92

Absolute Maximum Ratings (TA=25°C unless otherwise noted) Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con- ditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time. Note 1: Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. Thermal Characteristics Note 2: Mounted on an AAT4280 demo board in still 25ºC air. Value Symbol Description SOT23-6 SC70JW-8 Units ΘJA Thermal Resistance (SOT23-6 or SC70JW-8)2 120 140 °C/W PD Power Dissipation (SOT23-6 or SC70JW-8)2 833 714 mW Symbol Description Value Units VIN IN to GND -0.3 to 6 V VON ON/OFF to GND -0.3 to 6 V VOUT OUTto 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 TLEAD Maximum Soldering Temperature (at Leads) 300 °C VESD ESDRating1 - HBM 4000 V AAT4280 Slew Rate Controlled Load Switch 4280.2002.2.0.92 3

Electrical Characteristics (VIN = 5V, TA = -40 to 85°C unless otherwise noted. Typical values are at TA=25°C) Note 3: Part requires minimum start-up of VIN ≥ 2.0V to ensure operation down to 1.8V Note 4: For VIN outside this range consult typical ON/OFF threshold curve. Symbol Description Conditions Min Typ Max Units AAT4280 All Versions VIN Operation Voltage 1.8 3 5.5 V VUVLO Undervoltage Lockout V IN falling 1.0 1.4 1.8 V VUVLO(hys) Undervoltage Lockout Hysteresis 250 mV IQ Quiescent Current ON/OFF= active 2.5 4 uA IQ(off) Off supply current ON/OFF= inactive, OUT=open 1 uA ISD(off) Off switch current ON/OFF= inactive, V OUT=0 1 uA RDS(on) On -resistance V IN=5V, TA=25° C 80 120 m Ω VIN=4.2V, TA=25° C 85 130 VIN=3V, TA=25° C 100 150 VIN=1.8V, TA=25° C 160 250 TCRDS On-Resistance Temp -Co 2800 ppm/°C VIL ON/OFF Input Logic Low Voltage V IN=2.7V-5.5V 4 0.8 V VIH ON/OFF Input Logic High Voltage V IN=2.7V to ≤ 4.2V 2 V VIN= >4.2V to 5.5V 2.4 V ISINK ON/OFF Input Leakage V ON/OFF= 5.5V 1 uA AAT4280-1 TD(ON) Output Turn-On Delay V IN =5V, RLOAD=10Ω , TA=25° C 20 40 uS TON Output Turn-On rise time V IN =5V, RLOAD=10Ω , TA=25° C 1000 1500 uS TD(OFF) Output Turn-Off delay time V IN =5V, RLOAD=10Ω , TA=25° C 4 1 0 u S AAT4280-2 TD(ON) Output Turn-On Delay V IN =5V, RLOAD=10Ω , TA=25° C 0.5 2 uS TON Output Turn-On rise time V IN =5V, RLOAD=10Ω , TA=25° C 0.5 1 uS TD(OFF) Output Turn-Off delay time V IN =5V, RLOAD=10Ω , TA=25° C 4 10 uS AAT4280-3 TD(ON) Output Turn-On Delay V IN =5V, RLOAD=10Ω , TA=25° C 20 40 uS TON Output Turn-On rise time V IN =5V, RLOAD=10Ω , TA=25° C 100 150 uS TD(OFF) Output Turn_Off delay time V IN =5V, RLOAD=10Ω , TA=25° C 4 10 uS RPD Output pull-down resistance during OFF ON/OFF = inactive, T A=25° C 150 250 Ω AAT4280 Slew Rate Controlled Load Switch 4 4280.2002.2.0.92

(Unless otherwise noted, VIN = 5V, TA = 25°C) Off Switch Current vs. Temperature 0.001 0.010 0.100 1.000 -40 -20 0 20 40 60 80 10 0 Temperature (°C) IOFFSW (µA) ON/OFF Threshold vs. VIN 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 VIN (V) ON/OFF Threshold (V) VIH VIL RDS(ON) vs. Temperature 100 110 120 -40 -20 0 20 40 60 80 10 0 Temperature (°C) RDS(ON) (mΩ ) VIN=5V VIN=3V RDS(ON) vs. VIN 110 130 150 170 190 VIN (V) RDS(ON) (mΩ ) 500mA 100mA Quiescent Current vs. Input Voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0123456 VIN (V) Quiescent Current (µA) Quiescent Current vs. Temperature - 4 0- 2 002 04 06 08 01 0 0 Temperature (°C) IQ (µA) VIN=5V VIN=3V AAT4280 Slew Rate Controlled Load Switch 4280.2002.2.0.92 5

Typical Characteristics—4280-1 (Unless otherwise noted, VIN = 5V, TA = 25°C) AAT4280-1 Turn-Off VIN=5V RL=10Ω Time (10µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280-1 Turn-Off VIN=3V RL=6Ω Time (10µs/div) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280-1 Turn-On VIN=5V RL=10Ω Time (500µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280-1 Turn-On VIN=3V RL=6Ω Time (500µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280 Slew Rate Controlled Load Switch 6 4280.2002.2.0.92

Slew Rate Controlled Load Switch 4280.2002.2.0.92 7 Typical Characteristics—4280-2 (Unless otherwise noted, VIN = 5V, TA = 25°C) AAT4280-2 Turn-Off VIN=5V RL=10Ω Time (5µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280-2 Turn-Off VIN=3V RL=6Ω Time (5µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280-2 Turn-On VIN=5V RL=10Ω Time (5µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280-2 Turn-On VIN=3V RL=6Ω Time (5µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.)

Typical Characteristics—4280-3 (Unless otherwise noted, VIN = 5V, TA = 25°C) AAT4280-3 Turn-Off VIN=5V RL=10Ω Time (5µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280-3 Turn-Off VIN=3V RL=6Ω Time (5µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280-3 Turn-On VIN=5V RL=10Ω Time (50µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280-3 Turn-On VIN=3V RL=6Ω Time (50µs/div.) ON/OFF (5V/div.) VOUT (2V/div.) IIN (200mA/div.) AAT4280 Slew Rate Controlled Load Switch 8 4280.2002.2.0.92

The AAT4280 is a family of flexible P-channel MOSFET power switches designed for high-side load-switching applications. There are three ver- sions of AAT4280 with different turn-on and turn-off characteristics to choose from, depending upon the specific requirements of an application. The first AAT4280-1 version has a moderate turn on slew rate feature, which reduces in-rush current when the MOSFETis turned on. This function allows the load switch to be implemented with a small input capacitor, or no input capacitor at all. During turn on slewing, the current ramps linearly until it reach- es 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 R DS(ON) is minimized. The second device ver- sion, the AAT4280-2 is a very fast switch intended for high speed switching applications. This version has no turn on slew rate control and no special out- put discharge features. The final switch version, the AAT4280-3 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. All versions of the AAT4280 operate with input volt- ages ranging from 1.8V to 5.5V. All versions of this device have extremely low operating current, mak- ing them ideal for battery-powered applications. In cases where the input voltage drops below 1.8V, the AAT4280 MOSFET device is protected from entering into the saturation region of operation by automatically shutting down through an under volt- age lockout control circuit. The ON/OFF control pin is TTL compatible and will also function with 2.5 volt to 5 volt logic systems, making the AAT4280 an ideal level shifting load-switch. AAT4280 Slew Rate Controlled Load Switch 4280.2002.2.0.92 9 Functional Block Diagram Under Voltage Lockout Level Shift IN ON/OFF OUT GND Turn-On Slew Rate Control *AAT4280-3 only

Slew Rate Controlled Load Switch 10 4280.2002.2.0.92 Applications Information Input Capacitor Typically a 1µF or larger capacitor is recommend- ed for CIN in most applications. AC IN capacitor is not required for basic operation. However, C IN is useful in preventing load transients from affecting upstream circuits. C IN should be located as close to the device V IN pin as practically possible. Ceramic, tantalum or aluminum electrolytic capaci- tors may be selected for C IN. There is no specific capacitor ESR requirement for C IN. However, for higher current operation, ceramic capacitors are recommended for C IN due to their inherent capabil- ity over tantalum capacitors to withstand input cur- rent surges from low impedance sources such as batteries in portable devices. Output Capacitor For proper slew operation, a 0.1µF capacitor or greater between V OUT and GND is recommended. The output capacitor has no specific capacitor type or ESR requirement. 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 AAT4280 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 main- taining 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 the V OUT pin and possible damage to 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 COUT will effect a slower CIN decay rate during shutdown, thus preventing V OUT from exceeding VIN. In applications where there is a greater danger of VOUT exceeding VIN for extended periods of time, it is recommended to place a schot- tky diode from V IN to VOUT (connecting the cathode to VIN and anode to VOUT). The Schottky diode for- ward voltage should be less then 0.45 volts. Thermal Considerations and High Output Current Applications The AAT4280 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 need to be taken into account. The following discussions will assume the load switch is mounted on a printed circuit board utiliz- ing the minimum recommended footprint as stated in the layout considerations section. At any given ambient temperature (T A) the maxi- mum package power dissipation can be deter- mined by the following equation: P D(MAX) = [TJ(MAX) - TA] / ΘJA Constants for the AAT4280 are maximum junction temperature, TJ(MAX) = 125°C, and package thermal resistance, ΘJA = 120°C/W. Worst case conditions are calculated at the maximum operating tempera- ture where T A = 85°C. Typical conditions are cal- culated under normal ambient conditions where TA = 25°C. At TA = 85°C, PD(MAX) = 333mW. At TA = 25°C, PD(MAX) = 833mW. The maximum continuous output current for the AAT4280 is a function of the package power dissi- pation and the R DS of the MOSFETat TJ(MAX). The maximum RDS of the MOSFET at TJ(MAX) is calcu- lated by increasing the maximum room temperature R DS by the RDS temperature coefficient. The tem- perature coefficient (TC) is 2800ppm/°C. Therefore, MAX RDS125°C = RDS25°C × (1 + TC ×∆ T) MAX RDS125°C = 120mΩ× (1 + 0.0028 ×

Slew Rate Controlled Load Switch 4280.2002.2.0.92 11 For maximum current, refer to the following equation: IOUT(MAX) < ( PD(MAX) / RDS)1/2 For example, if VIN = 5V, RDS(MAX)=154mΩ and TA = 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 will increase, and the device will be damaged. Higher peak currents can be obtained with the AAT4280. 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. High Peak Output Current Applications Some applications require the load switch to oper- ate at a continuous nominal current level with short duration high current peaks. The duty cycle for both output current levels must be taken into account. To do so, first calculate the power dissi- pation at the nominal continuous 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 AAT4280 oper- ates at a continuous 100mAload current level and has short 2Acurrent peaks, as in a GSM applica- tion. 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 100mAfor 87.5% of the 4.61ms period and 2Afor 12.5% of the period. Since the Electrical Characteristics do not report R DS(MAX) for 4 volt operation, it must be calculated approxi- mately by consulting the chart of R DS(ON) vs. VIN. The RDS reported for 5 volts can be scaled by the ratio seen in the chart to derive the RDS for a 4 volt VIN: 120mΩ× 87mΩ /80mΩ = 130mΩ . De-rated for temperature: 130mΩ x (1 + .0028 × (125°C - 25°C)) = 166m Ω . The power dissipation for a 100mAload is calculated as follows: PD(MAX) = IOUT 2 × RDS PD(100mA) = (100mA)2 × 166mΩ 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 2Ais calculated: P D(MAX) = IOUT 2 × 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 dissipa- tion 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 AAT4280 operating 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 with in the thermal limits for safe operation of the device, in fact, at 85°C, the AAT4280 will handle a 2Apulse for up to 50% duty cycle. At lower ambi- ent temperatures the duty cycle can be further increased.

Figure 1: Evaluation board Figure 2: Evaluation board Figure 3: Evaluation board top side silk screen layout / component side layout solder side layout assembly drawing AAT4280 Slew Rate Controlled Load Switch 12 4280.2002.2.0.92 Printed Circuit Board Layout Recommendations For proper thermal management, and to take advantage of the low RDS(ON) of the AAT4280, a few circuit board layout rules should be followed: V IN and VOUT 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 AAT4280 SOT23-6/ SC70JW-8 package, the ground plane area con- nected 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 AAT4280 evaluation layout follows the printed circuit 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.

Ordering Information

Package Information

b A2 A E D f t L C GAUGE PLANE e Device Option Package Marking Part Number Bulk Tape and Reel AAT4280-1 SOT23-6 N/A AAT4280IGU-1-T1 AAT4280-2 SOT23-6 N/A AAT4280IGU-2-T1 AAT4280-3 SOT23-6 N/A AAT4280IGU-3-T1 AAT4280-1 SC70JW-8 N/A AAT4280IJS-1-T1 AAT4280-2 SC70JW-8 N/A AAT4280IJS-2-T1 AAT4280-3 SC70JW-8 N/A AAT4280IJS-3-T1 AAT4280 Slew Rate Controlled Load Switch 4280.2002.2.0.92 13 Dim Millimeters Inches Min Max Min Max A 1.00 1.30 0.039 0.051 A1 0.00 0.10 0.000 0.004 A2 0.70 0.90 0.028 0.035 b 0.35 0.50 0.014 0.020 c 0.10 0.25 0.004 0.010 D 2.70 3.10 0.106 0.122 E1.40 1.80 0.055 0.071 e 1.90 0.075 H 2.60 3.00 0.102 0.118 L 0.37 0.015 S 0.45 0.55 0.018 0.022 S1 0.85 1.05 0.033 0.041 Θ 1° 9° 1° 9°

Θ 1 D AA2 b E eee L Θ c 0.048REF AAT4280 Slew Rate Controlled Load Switch 14 4280.2002.2.0.92 Advanced Analogic Technologies, Inc.

1250 Oakmead Parkway, Suite 310, Sunnyvale, CA94086

Phone (408) 524-9684 Fax (408) 524-9689 Dim Millimeters Inches Min Max Min Max E2.10 BSC 0.083 BSC E1 1.75 2.00 0.069 0.079 L 0.23 0.40 0.009 0.016 A 1.10 0.043 A1 0 0.10 0.004 A2 0.70 1.00 0.028 0.039 D 2.00 BSC 0.079 BSC e 0.50 BSC 0.020 BSC b 0.15 0.30 0.006 0.012 c 0.10 0.20 0.004 0.008 Θ 08 º08 º Θ1 4º 10º 4º 10º