View RT9182EPES_4115792.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

RT9182
Dual, Low-Noise, 200mA LDO Regulator
General Description
The RT9182 is a dual-channel, low noise, and low dropout regulator supplying up to 200mA current at each channel. The output voltage ranges from 1.5V to 3.3V in 100mV increments and 2% accuracy by operating from a +2.7V to +5.5V input. The RT9182 uses an internal PMOS as the pass device, which consumes 165A supply current (both LDOs on) independent of load current and dropout conditions. The EN1 and EN2 pins control each output respectively. When both outputs shutdown simultaneously, the chip will be turn off and consumes nearly zero operation current which is suitable for battery-power devices. Other features include a current limiting, and over temperature protection.
Features
Up to 200mA Output Current (Each LDO) Dual Shutdown Pins Control Each Output 124VRMS Low Noise Output Current Limiting and Thermal Protection Short Circuit Protection 120mV Dropout at 100mA Load Two LDOs in SOT-23-6 Package RoHS Compliant and 100% Lead (Pb)-Free
Applications
Cellular Phones Laptop, Notebook, and Palmtop Computers Battery-powered Equipment Hand-held Equipment Wireless LAN
Ordering Information
RT9182 Package Type ES : SOT-23-6 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage A : 2.8V (Output1), 2.8V (Output2) B : 3.0V (Output1), 3.0V (Output2) C : 2.8V (Output1), 3.0V (Output2) D : 2.8V (Output1), 2.5V (Output2) E : 2.8V (Output1), 1.8V (Output2) F : 2.5V (Output1), 2.5V (Output2) G : 2.5V (Output1), 1.8V (Output2) H : 3.3V (Output1), 2.5V (Output2) I : 3.3V (Output1), 1.8V (Output2) J : 3.0V (Output1), 2.5V (Output2) K : 3.0V (Output1), 1.8V (Output2) L : 2.8V (Output1), 1.85V (Output2)
Marking Information
For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail.
Pin Configurations
(TOP VIEW)
VOUT1 VIN 6 1 5 2 EN1 4 3
VOUT2 GND EN2
SOT-23-6 Note : There is no pin1 indicator on top mark for SOT-23-6
Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100%matte tin (Sn) plating.
type, and pin 1 will be lower left pin when reading top mark from left to right.
DS9182-17 March 2007
www.richtek.com 1
RT9182
Typical Application Circuit
Chip Enable
3
Chip Enable EN2 VOUT2 EN1 VOUT1
4 6 1
VOUT2 2.2uF
2.2uF RT9182 VIN GND
2 5
VOUT1
VIN 2.2uF
Functional Pin Description
Pin No. 1 2 3 4 5 6 Pin Name VOUT2 GND EN2 EN1 VIN VOUT1
Note Note
Pin Function Channel 2 Output Voltage Common Ground Chip Enable (Active High) Chip Enable (Active High) Supply Input Channel 1 Output Voltage
Note: If EN1 and EN2 are both low, both regulators and the reference turn off.
Function Block Diagram
Current Limit VIN
+
Thermal Protection
Current Limit
VREF
+
VOUT1
VOUT2
GND
EN1
Bias EN2
www.richtek.com 2
DS9182-17 March 2007
RT9182
Absolute Maximum Ratings
(Note 1) 6.5V 0.4W 250C/W 260C -65C to 150C 2kV 200V Supply Input Voltage -----------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C SOT-23-6 -------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 5) SOT-23-6, JA --------------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------
Recommended Operating Conditions
(Note 3)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.7V to 5.5V Enable Input Voltage ------------------------------------------------------------------------------------------------------ 0V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- -40C to 125C
Electrical Characteristics
(VIN = 3.6V, CIN = COUT = 2.2F, EN1 = EN2 = VIN, typical values at TA = 25C, for each LDO unless otherwise specified.)
Parameter Output Voltage Accuracy (Load Regulation) Maximum Output Current Current Limit Quiescent Current
Symbol VOUT IMAX ILIM IG
Test Conditions IL = 1mA to 200mA Continuous RLOAD = 1 No Load IOUT = 100mA (Both LDOs) IOUT = 1mA
Min -2 200 500 ------0.2 1.6 ------
Typ ---165 165 1.2 120 255 ----0.01 140 10 124 62
Max +2 -1000 260 260 ---+0.2 -0.4 100 2 -----
Units % mA mA A A mV mV mV %/V V V nA A C C VRMS dB
Dropout Voltage
(Note 4)
VDROP
IOUT = 100mA IOUT = 200mA VIN = (VOUT +0.4V or 2.7V) to 5.5V IOUT = 1mA VIN = 2.7V to 5.5V VIN = 2.7V to 5.5V EN = GND or VIN EN1 = EN2 = GND
Line Regulation EN Input High Threshold EN Input Low Threshold EN Input Bias Current Shutdown Supply Current Thermal Shutdown Temperature Thermal Shutdown Hysteresis Output Voltage Noise Output Voltage AC PSRR
VLINE VIH VIL ISD IGSD TSD TSD eNO
10Hz to 100kHz, COUT = 4.7F, ILOAD = 1mA 100Hz, COUT = 4.7F, ILOAD = 100mA
---
DS9182-17 March 2007
www.richtek.com 3
RT9182
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV. Note 5. JA is measured in the natural convection at TA = 25C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard.
www.richtek.com 4
DS9182-17 March 2007
RT9182
Typical Operating Characteristics
Quiescent Current vs. Supply Voltage
240 200 160 120 80 40 0 2.5 3.5 4.5 5.5 6.5
Output Voltage Accuracy vs. Temperature
1.0 0.8
Quiescent Current (uA)1
No Load
Output Voltage (%)1
0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 -40 -15 10 35 60 85
ILOAD = 100mA,both outputs
Supply Voltage (V)
Temperature (C)
Quiescent Current vs. Load Current
180 150 120 90 60 30 0 0 40 80 120 160 200
Dropout Voltage vs. Temperature
300
Quiescent Current (uA)1
Both outputs loaded
250
Dropout Voltage (mV)
200 150 100 50
ILOAD = 200mA
0 -40 -15 10 35 60 85
Load Current (mA)
Temperature (C)
Quiescent Current vs. Temperature
300 250 200 150 100 50
Channel-to-Channel Isolation vs. Frequency
120 100 80 60 40 20
Channel Isolation (dB) 1
Quiescent Current (uA)
VIN = 3.6V
0 -45 -25 -5 15 35 55 75 95
RLOAD = 100
0
100
1K
10K
100K
1M
Temperature (C)
Frequency (Hz)
DS9182-17 March 2007
www.richtek.com 5
RT9182
Output Voltage Deviation (20mV/Div)
Line Transient Response
Output Voltage Deviation (50mV/Div)
Load Transient Response
COUT = 2.2uF ILOAD = 0 to 80mA
Input Voltage Deviation
4.5 3.5
Load Current (100mA/Div)
Peak value depends on COUT ESR
Time (50us/Div)
Time (10us/Div)
EN Pin Shutdown Response
Output Voltage (1V/Div)
ILOAD = 50mA RT9182ACES
Noise
EN Pin Voltage (5V/Div)
Noise (200V/Div)
ILOAD = 100mA both output VIN = 4.5V CIN = COUT = 2.2uF
f = 10Hz to 100kHz
Time (1ms/Div)
Time (10ms/Div)
Noise
RT9182ACES
Noise (200V/Div)
No load both output VIN = 4.5V CIN = COUT = 2.2uF f = 10Hz to 100kHz
Time (10ms/Div)
www.richtek.com 6
DS9182-17 March 2007
RT9182
Applications Information
The RT9182 is integrated with two low noise, low dropout, and low quiescent current linear regulators designed primarily for battery-powered applications. Output voltages are optional ranging from 1.5V to 3.3V, and each channel can supply current up to 200mA. Shutdown The RT9182 is shutdown by pulling the EN input low, and turned on by driving the input high. If this feature is not to be used, the EN input should be tied to VIN to keep the regulator on at all times (the EN input must not be floating). Internal P-Channel Pass Transistor The RT9182 features double typical 1.5 P-channel MOSFET pass transistors. It provides several advantages over similar designs using PNP pass transistors, including longer battery life. The P-Channel MOSFET requires no base drive, which reduces quiescent current considerably. PNP-based regulators waste considerable current in dropout when the pass transistor saturates. They also use high base-drive currents under large loads. The RT9182 does not suffer from these problems and consume only 165A of quiescent current whether in dropout, light-load, or heavy-load applications. Current Limit and Thermal Protection The RT9182 includes two independent current limit structure which monitor and control each pass transistor's gate voltage limiting the guaranteed maximum output current to 200mA. Thermal-overload protection limits total power dissipation in the RT9182. When the junction temperature exceeds TJ = +140C, the thermal sensor signals the shutdown logic turning off the pass transistor and allowing the IC to cool. The thermal sensor will turn the pass transistor on again after the IC's junction temperature cools by 10C, resulting in a pulsed output during continuous thermaloverload conditions. Thermal-overloaded protection is designed to protect the RT9182 in the event of fault conditions. Do not exceed the absolute maximum junction temperature rating of TJ = + 125C for continuous operation. The output can be shorted to ground for an indefinite amount
DS9182-17 March 2007
of time without damaging the part by cooperation of current limit and thermal protection. Operating Region and Power Dissipation The maximum power dissipation of RT9182 depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipation across the device is P = IOUT (VIN - VOUT). The maximum power dissipation is : P(MAX) = (TJ - TA) / JA where TJ - TA is the temperature difference between the RT9182 die junction and the surrounding environment, JA is the thermal resistance from the junction to the surrounding environment. The GND pin of the RT9182 performs the dual function of providing an electrical connection to ground and channeling heat away. Connect the GND pin to ground using a large pad or ground plane. Capacitor Selection and Regulator Stability Like any low-dropout regulator, the external capacitors used with the RT9182 must be carefully selected for regulator stability and performance. Using a capacitor whose value is > 1F on the RT9182 input and the amount of capacitance can be increased without limit. The input capacitor must be located a distance of not more than 0.5" from the input pin of the IC and returned to a clean analog ground. Any good quality ceramic or tantalum can be used for this capacitor. The capacitor with larger value and lower ESR (equivalent series resistance) provides better PSRR and linetransient response. The output capacitor must meet both requirements for minimum amount of capacitance and ESR in all LDO applications (see Figure1). The RT9182 is designed specifically to work with low ESR ceramic output capacitor in space-saving and performance consideration. Using a ceramic capacitor whose value is at least 1F with ESR is > 5m on the RT9182 output ensures stability. The RT9182 still works well with output capacitor of other types due to the wide stable ESR range. Output capacitor
www.richtek.com 7
RT9182
of larger capacitance can reduce noise and improve loadtransient response, stability, and PSRR. The output capacitor should be located not more than 0.5" from the VOUT pin of the RT9182 and returned to a clean analog ground. Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. It may be necessary to use 2.2F or more to ensure stability at temperatures below -10C in this case. Also, tantalum capacitors, 2.2F or more may be needed to maintain capacitance and ESR in the stable region for strict application environment. Tantalum capacitors maybe suffer failure due to surge current when it is connected to a low-impedance source of power (like a battery or very large capacitor). If a tantalum capacitor is used at the input, it must be guaranteed to have a surge current rating sufficient for the application by the manufacture. Load-Transient Considerations The RT9182 load-transient response graphs show two components of the output response: a DC shift from the output impedance due to the load current change, and the transient response. The DC shift is quite small due to the excellent load regulation of the IC. Typical output voltage transient spike for a step change in the load current from 0mA to 50mA is tens mV, depending on the ESR of the output capacitor. Increasing the output capacitor's value and decreasing the ESR attenuates the overshoot. Input-Output (Dropout) Voltage A regulator's minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this will determine the useful end-of-life battery voltage. Because the RT9182 uses a P-Channel MOSFET pass transistor, the dropout voltage is a function of drain-to-source onresistance [RDS(ON)] multiplied by the load current. Reverse Current Path The power transistor used in the RT9182 has an inherent diode connected between each regulator input and output (see Figure2). If the output is forced above the input by more than a diode-drop, this diode will become forward biased and current will flow from the VOUT terminal to VIN. This diode will also be turned on by abruptly stepping the input voltage to a value below the output voltage. To prevent regulator mis-operation, a Schottky diode could be used in the applications where input/output voltage conditions can cause the internal diode to be turned on (see Figure3). As shown, the Schottky diode is connected in parallel with the internal parasitic diode and prevents it from being turned on by limiting the voltage drop across it to about 0.3V < 100mA to prevent damage to the part.
Region of Stable Cout ESR v.s Load Current
100
Instable
10
COUT = 4.7uF COUT = 1uF
Cout ESR (() )1 COUT
1
Stable
0.1
0.01
Instable
0.001 0 40 80 120 160 200
Load Current (mA)
Figure 1
VIN
VOUT
Figure 2
VIN
VOUT
Figure 3
www.richtek.com 8
DS9182-17 March 2007
RT9182
Outline Dimension
H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 0.000 1.397 0.250 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.031 0.000 0.055 0.010 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT-23-6 Surface Mount Package
Richtek Technology Corporation
Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
DS9182-17 March 2007
www.richtek.com 9

▲Up To Search▲

Price & Availability of RT9182EPES

	To Download RT9182EPES Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .