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RT9186A/B
Low Profile 500mA LDO with Enable and Power Good/Reset
General Description
The RT9186 is a low-dropout linear regulator providing up to 500mA load current with 160mV dropout. It is especially designed for the application of portable and smart handheld device. The RT9186 operates from 2.5V to 5.5V supply. The internal P-MOSFET pass transistor allows the regulator to work with 190A low quiescent current. Its preset output voltage version covers the most frequently used values, including 1.8V/2.5V/3.3V. Output voltage can also be adjusted via the ADJ pin for those other than the preset values. With only 0.1A required in the shut down mode, one enable pin is able to control output on/off. RT9186A contains PGOOD function. On the other hand, RT9186B contains RST function with 6ms (typ.) time delay.
Features
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2.5V to 5.5V Wide Input Range Guaranteed 500mA Output Current Low 160mV Dropout at 500mA 1.8V/2.5V/3.3V Preset Output Voltage Version with Adjustable Range from 0.8V to 4.5V. Reset Output with 6ms (typ.) Delay Time Power Good Output Low 190A Ground Pin Current 0.1A Shutdown Current Thermal and Over Current Protection RoHS Compliant and 100% Lead (Pb)-Free
Applications
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Ordering Information
RT9186A/B - Package Type F : MSOP-8 QV : VDFN-8L 3x3 (V-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage Default : Adjustable 18 : 1.8V 25 : 2.5V 33 : 3.3V A : Power Good Function B : Reset Function
Notebook Computer PDAs/SHDs PCMCIA/Cardbus Card Product Mobile Phone
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)
VIN VIN PGOOD EN
8 2 3 4 7 6 5
VOUT VOUT ADJ GND
VIN VIN PGOOG EN
1 2 3 4
8 7 6 9 5
VOUT VOUT ADJ GND
MSOP-8 RT9186A
VDFN-8L 3x3
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.
VIN VIN RST EN
8 2 3 4 7 6 5
VOUT VOUT ADJ GND
VIN VIN RST EN
1 2 3 4
9
8 7 6 5
VOUT VOUT ADJ GND
MSOP-8 RT9186B
VDFN-8L 3x3
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RT9186A/B
Pin Description
Pin Name Pin Function VIN VOUT GND EN PGOOD RST ADJ Power Input Voltage. Output Voltage. Ground. Chip Enable (Active-High). There should be a pull low resistor 100k connected to GND when the control signal is floating. Power Good Indicator. (RT9186A). Open-Drain Active-Low Reset Output. Connect a 100k to VOUT to obtain output voltage. In shutdown the RST output is low. (RT9186B). Output Voltage Setting. Connect to GND for Fixed output voltage model.
Typical Application Circuit
VIN
VIN CIN 1uF
VOUT RPGOOD/RST 100k TO C
RT9186A/B PGOOD/ EN RST ADJ GND
VOUT COUT 10uF
Chip Enable
Figure 1. Fixed Voltage Regulator
VIN
CIN 1uF
VIN
VOUT
COUT 10uF 100k TO C
VOUT
RT9186A/B EN GND PGOOD/ RST ADJ
Chip Enable
R1
V OUT = 0.8 (1 +
R1 R2
)
R2
Figure 2. Adjustable Voltage Regulator
Note1 : R2 should be less than 80k to ensure regulation. Note2 : X5R or X7R input capacitor 1F is recommended for output stability.
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Function Block Diagram
VIN Current Limit Sensor + 0.8V Reference
Error Amplifier
-
+ VOUT
EN
Shutdown Logic
Thermal Shutdown ADJ Output Mode Comparator
PGOOD + Current Limit Sensor + 0.8V Reference
Error Amplifier
80% Reference
VIN
EN
Shutdown Logic
RST + + Delay Timer -
80% Reference
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+
100mV
GND
-RT9186A-
-
+ VOUT Thermal Shutdown ADJ
Output Mode Comparator
100mV
GND
-RT9186B-
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RT9186A/B
Timing Diagram
VIN 80% of VOUT (Normal) VOUT
PGOOD Function (RT9186A) Reset function (RT9186B)
Delay Time (typ.) 6ms
Absolute Maximum Ratings
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(Note 1)
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Input Voltage ---------------------------------------------------------------------------------------------------------- 7V Storage Temperature Range --------------------------------------------------------------------------------------- -65C to 150C Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------- 260C Power Dissipation, PD @ TA = 25C MSOP-8 ---------------------------------------------------------------------------------------------------------------- 0.625W VDFN-8L 3x3 ---------------------------------------------------------------------------------------------------------- 0.952W Package Thermal Resistance (Note 4) MSOP-8, JA ---------------------------------------------------------------------------------------------------------- 160C/W VDFN-8L 3x3, JA ---------------------------------------------------------------------------------------------------- 105C/W Junction Temperature ----------------------------------------------------------------------------------------------- 150C ESD Susceptibility (Note 2) HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V (Note 3)
Recommended Operating Conditions
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Input Voltage ---------------------------------------------------------------------------------------------------------- 2.5V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------- -40C to 125C Ambient Temperature Range -------------------------------------------------------------------------------------- -40C to 85C
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Electrical Characteristics
(VIN = VOUT(NOM) + 500mV or VIN = +2.5V (whichever is greater), TA = 25C, unless otherwise specified)
Parameter General Specification Input Under Voltage Lock-Out Output Voltage Accuracy (Preset Mode) Adjustable Output Voltage Range ADJ Pin Voltage ADJ Input Bias Current Short Circuit Current Limit Quiescent Current Dropout Voltage (Note 6) (Note 5)
Symbol
Test Conditions
Min
Typ
Max
Units
V UVLO VOUT V OUT_ADJ V ADJ I ADJ ILIM IQ V DROP VLINE VADJ = +0.8V VOUT = 0V IOUT = 0mA IOUT = 500mA VOUT = 2.5V VOUT = 3.3V IOUT = 1mA to 500mA
2.0 -3 0.8 0.784 -0.9 ------
2.3 0 -0.8 10 1.4 190 200 160 0.02 21
2.4 +3 4.5 0.816 100 2.0 250 330 220 0.125 40
V % V V nA A A mV
Line Regulation Load Regulation Chip Enable Standby Current Logic-Low Voltage EN Threshold Logic-High Voltage EN Input Bias Current Reset Reset Output Low Voltage Output High Leakage Current Threshold to Output Voltage Reset Delay Time Power Good PGOOD Output Low Voltage Output High Leakage Current Threshold to Output Voltage Thermal Protection Thermal Shutdown Temperature Thermal Shutdown Hysteresis (Note 7)
VOUT + 0.1V < VIN < 5.5V IOUT = 5mA IOUT = 1mA to 500mA
%/V mV
VLOAD
I STBY VENL VENH I EN
VIN = 5.5V VIN = 2.5V VIN = 5.5V VCE = 5.5V
--1.6 --
0.1 --20
2 0.7
A V
-100 nA
VOL
Reset Output Sinking 2mA VRST = 5V Rising edge, referred to V OUT
--77 0.7
50 -80 6
100 100 83 8
mV nA % ms
TDELAY
Rising edge of VOUT to VRST
PGOOD Output sinking 2mA
---
50 -80
100 100 83
mV nA %
VPGOOD = 5V
Rising edge, referred to
VOUT
77
T SD TSD
---
160 30
---
C C
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RT9186A/B
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 is highly recommended. Note 3. The operating conditions beyond the recommended range is not guaranteed. Note 4. JA is measured in the natural convection at TA = 25C on a low effective thermal conductivity test board (single-layer, 1S) of JEDEC 51-3 thermal measurement standard. Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV. Note 6. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN - IOUT under no load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin current. Note 7. Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested for load regulation in the load range from 1mA to 300mA and 500mA respectively.
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Typical Operating Characteristics
CIN = 1uF(X7R Ceramic), COUT = 10uF(Y5V Ceramic), TA = 25C, unless otherwise specified.
Input Voltage vs. Input Output Voltage vs. Output Voltage
3.5 3
Output Voltage vs. Temperature
3.3
No Load ILOAD = 500mA
VOUT = 3.3V
3.1
Output Volatge (V)
Output Voltage (V)
2.5 2 1.5 1 0.5
2.9 2.7 2.5 2.3 2.1 1.9
VEN = VIN = 5V RL = VOUT = 2.5V
VOUT = 1.8V
VOUT = 3.3V
0 2 2.7 3.4 4.1 4.8 5.5 1.7 -50 -25 0 25 50 75 100 125
Input Voltage (V)
Temperature (C)
Quiescent Current vs. Temperature
230
Dropout Voltage vs. Load Current
250 VOUT = 2.5V TJ = 125C
Quiescent Current (uA) 1
210
190
Dropout Voltage (mV)
VEN = VIN = 3.3V VOUT = 1.8V RL =
200
150 TJ = 25C 100
170
TJ = -40C
150
50
130 -50 -25 0 25 50 75 100 125
0 0 100 200 300 400 500
Temperature (C)
Load Current (mA)
Short Circuit Current Limit
Short Circuit Current Limit (A)
Short Circuit Current Limit vs. Temperature
1.60
Short Circuit Current Limit (A) 1
VEN = VIN = 3.3V VOUT = 1.8V RL = 0
VEN = VIN = 3.3V VOUT = 1.8V RL = 0
2 1.5 1 0.5 0
1.55
1.50
1.45
1.40
Time (1 ms/Div)
-50
-25
0
25
50
75
100
125
Temperature (C)
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RT9186A/B
Line Transient Response
Output Voltage Deviation(mV) 20 0 -20 Output Voltage Deviation(mV) 20 0 -20 0.4 0.2 0
VOUT = 1.8V VIN = 3.3V ILOAD = 1 to 250mA
Load Transient Response
Input Voltage(V)
4 3
ILOAD = 100mA VOUT = 1.8V Without CIN
Time (50us/Div)
Load Current (A)
Time (50us/Div)
Reset Response
Reset Response
VEN (2V/Div) ILOAD = 50mA VOUT = 3.3V VIN = 3.8V
VIN = VEN (2V/Div)
VOUT (2V/Div) VOUT (2V/Div) VRST (2V/Div) ILOAD = 50mA VOUT = 3.3V Without CIN
VRST (2V/Div)
Time (10ms/Div)
Time (1ms/Div)
PGOOD Response
VEN (2V/Div)
Shutdown Response
ILOAD = 500mA, VOUT = 3.3V, VIN = 5V
EN Voltage (V) Output Voltage (V)
ILOAD = 50mA VOUT = 3.3V VIN = 3.8V
4 2 0 3
VOUT (2V/Div)
VPGOOD (2V/Div)
2 1 0
Time (1ms/Div)
Time (100us/Div)
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Application Information
Capacitor Selection and Regulator Stability Careful selection of the external capacitors for RT9186 is highly recommended in order to remain high stability and performance. Regarding the Input capacitor, connecting an X7R or X5R ceramic capacitor which is 1F between input and ground is a must. Distance less than 1 cm between input pin and ground of RT9186 is recommended to avoid any unstability. With larger value of capacitor adding on lower ESR could result in better performance for both PSRR and line transient response. Regarding the output capacitor, connecting a10F capacitor between output and ground is a must. Any capacitor is acceptable only with a highlight of relation between ESR region and Load current, shown in below. Output capacitor with larger capacitance can reduce noise and improve load transient response, stability, and PSRR. The same as Input capacitor, distance less than 1 cm between output pin and ground of RT9186 is recommended to avoid any unstability. Input-Output (Dropout) Voltage A regulator' s minimum input-to-output voltage differential (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the device uses a P-MOSFET, its dropout voltage is a function of drain-tosource on-resistance, RDS(ON), multiplied by the load current: VDROPOUT = VIN -VOUT = RDS(ON) IOUT Over-Current and Short-Circuit Protection The RT9186 continuously monitors output current to provide maximum safety. In the event of output over current or short-circuit, over-current protection function will activate and override the voltage regulation function to limit output current at 1.4A typically. Large power dissipation at this condition may cause chip temperature to raise and trigger the over temperature protection if over-current or shortcircuit is not removed in a short time Power Good and Reset The power good and the reset output is an open-drain output. Connect an 100k pull up resistor to VOUT to obtain an output voltage. The power good will output high immediately after the output voltage arrives 80% of normal output voltage. In the same situation, the reset will output high with 6ms delay time. See Timing Diagram and Typical Operating Characteristics. Adjustable Operation
Stable
0.10 0.10
Region of Stable COUT ESR vs. Load Current
100.00 100
VIN = 3V
10.00 10
COUT ESR ()
Instable
1.001
The output voltage of RT9186 is adjustable from 0.8V to 4.5V by an external voltage divider as shown in Typical Application Circuit Figure 2. The value of R2 should be less than 80k to ensure regulation.
300 400 500
Instable 0.01 0.01
0 100 200
Load Current (mA)
Chip Enable Operation Pull the EN pin low to drive the device into shutdown mode. At the same time, pin 3 (PGOOD/RST) is pulled low. During shutdown mode, the standby current drops to 0.1A (typ). The output voltage decay rate is determined by the external capacitor and load current. Drive the EN pin high to turn on the device again.
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RT9186A/B
Reverse Current Path The P-MOSFET pass element of RT9186 has an inherendiode connected between the regulator input and output as shown in Figure 3. The inherent diode will be forward biased and conduct an unlimited current if VOUT is sufficiently higher than V IN . a Schottky diode is recommended connecting parallel with the inherent diode in the application where output voltage may be higher than input voltage as shown in Figure 4. This Schottkly will clamp the forward bias voltage to 0.3V and conduct the possible current to protect the RT9186 from damage by unlimited current. surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula : PD(MAX) = ( TJ(MAX) - TA ) / JA Where T J(MAX) is the maximum operation junction temperature 125C, TA is the ambient temperature and the JA is the junction to ambient thermal resistance. For recommended operating conditions specification of RT9186A/B, where T J(MAX) is the maximum junction temperature of the die (125C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance JA is layout dependent. For VDFN-8L 3x3 package, the thermal resistance JA is 105C/W on the standard JEDEC 51-3 single-layer 1S thermal test board and 70C/W on the standard JEDEC 51-7 4-layers 2S2P thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula : PD(MAX) = ( 125C - 25C ) / 105 = 0.952W for single-layer 1S board PD(MAX) = ( 125C - 25C ) / 70 = 1.428W for 4-layers 2S2P board The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance JA. For RT9186A/B packages, the Figure 5 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed.
1500 1250 1000 750 500 250 0 0 25 50 75 100 125
VIN
VOUT
Figure 3. Inherent Diode of P-MOSFET Pass Transistor
VIN
VOUT
Figure 4. Schottkly Diode Parallel with The Ingerent Diode Thermal Considerations Thermal protection limi ts power dissipation in RT9186A/B. When the operation junction temperature exceeds 160C, the OTP circuit starts the thermal shutdown function and turns the pass element off. The pass element turn on again after the junction temperature cools by 30C. For continuous operation, do not exceed absolute maximum operation junction temperature 125C. The power dissipation definition in device is : PD = (VIN-VOUT ) x IOUT + VIN x IQ The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of
Maximum Power Dissipation (mW)
DFN-8L at 4-Layers PCB DFN-8L at 1-Layers PCB
MSOP-8 at 1-Layers PCB
Ambient Temperature (C)
Figure 5
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RT9186A/B
PCB Layout Good board layout practices must be used or instability can be induced because of ground loops and voltage drops. The input and output capacitors MUST be directly connected to the input, output, and ground pins of the device using traces which have no other currents flowing through them. The best way to do this is to layout CIN and COUT near the device with short traces to the VIN, VOUT , and ground pins. The regulator ground pin should be connected to the external circuit ground so that the regulator and its capacitors have a "single point ground". It should be noted that stability problems have been seen in applications where "vias" to an internal ground plane were used at the ground points of the device and the input and output capacitors. This was caused by varying ground potentials at these nodes resulting from current flowing through the ground plane. Using a single point ground technique for the regulator and it' s capacitors fixed the problem. Since high current flows through the traces going into VIN and coming from VOUT, Kelvin connect the capacitor leads to these pins so there is no voltage drop in series with the input and output capacitors. Optimum performance can only be achieved when the device is mounted on a PC board according to the MSOP-8 Board Layout diagram.
GND
+ VOUT PGOOD / RST
SET
VIN +
EN
GND
MSOP-8 Board Layout
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RT9186A/B
Outline Dimension
D L
E
E1
e A A1 b A2
Symbol A A1 A2 b D e E E1 L
Dimensions In Millimeters Min 0.810 0.000 0.750 0.220 2.900 0.650 4.800 2.900 0.400 5.000 3.100 0.800 Max 1.100 0.150 0.950 0.380 3.100
Dimensions In Inches Min 0.032 0.000 0.030 0.009 0.114 0.026 0.189 0.114 0.016 0.197 0.122 0.031 Max 0.043 0.006 0.037 0.015 0.122
8-Lead MSOP Plastic Package
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RT9186A/B
D
D2 L
E
E2
1
e
b
A A1
A3
Symbol A A1 A3 b D D2 E E2 e L
Dimensions In Millimeters Min 0.800 0.000 0.175 0.200 2.950 2.250 2.950 1.450 0.650 0.425 0.525 Max 1.000 0.050 0.228 0.300 3.050 2.350 3.050 1.550
Dimensions In Inches Min 0.031 0.000 0.007 0.008 0.116 0.089 0.116 0.057 0.026 0.017 0.021 Max 0.039 0.002 0.009 0.012 0.120 0.093 0.120 0.061
V-Type 8L DFN 3x3 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
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