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Very Low Dropout, Low Quiescent 500mA Regulator
POWER MANAGEMENT Description
The SC1563 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 500mA. Since it has superior dropout characteristics compared to regular LDOs, it can be used to supply 2.5V on motherboards or 2.8V on peripheral cards from the 3.3V supply with no heatsink. Additionally, the SC1563 has a shutdown pin to further reduce power dissipation while shut down. The SC1563 provides excellent regulation over variations in line, load and temperature. A wide range of fixed output voltage options are available. In addition, the output voltage of every device can be adjusted between 1.2V and 4.8V using external resistors. The SC1563 comes in the space saving 5-pin SOT23 package.
SC1563
Features
350mV dropout @ 500mA Designed to operate with ceramic capacitors Adjustable output from 1.2V to 4.8V Multiple output voltage options (all parts also adjustable externally using resistors) Over current and over temperature protection 2A quiescent current in shutdown No minimum load current requirement Low reverse leakage (output to input) Full industrial temperature range 5-pin SOT-23 surface mount package. Also available in Lead-free, fully WEEE and RoHS compliant
Applications
Personal Digital Assistants Battery powered systems Motherboards Peripheral cards PCMCIA cards
Typical Application Circuits
Internally Preset Output Voltage Externally Set Output Voltage
U1 VIN SHDN 5 1 IN
SC1563IS-X.X OUT 4 VO (X.XV) VIN SHDN C2 C1 5 1 U1 IN SC1563IS-X.X OUT 4 R1 VO
SHDN GND ADJ 2 3
SHDN GND ADJ 2 3
C1
C2 R2
VOUT =
1.200 (R1 + R2) Volts R2
Revision: January 11, 2006
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SC1563
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
Parameter Input Voltage Shutdown Voltage Power Dissipation Thermal Resistance Junction to Ambient(1) Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 sec ESD Rating
Symbol VIN VSHDN PD JA TA TJ TSTG TLEAD V ESD
Maximum -0.3 to 7 -0.3 to VIN Internally Limited 175 -40 to 85 -40 to 150 -65 to 150 300 2
Units V V W C/W C C C C kV
Note: (1) Minimum pad size.
Electrical Characteristics
Unless specified: VSHDN = 0V, Adjustable mode (VADJ > VTH(ADJ)): VIN = 2.2V to 5.5V and IOUT = 0A to 500mA, Fixed mode (VADJ = GND): VIN = (VOUT + 0.7V) to 5.5V and IOUT = 0A to 500mA. Values in bold apply over full operating temperature range.
Parameter IN Supply Voltage Range Quiescent Current
Symbol
Conditions
Min
Typ
Max
Units
VIN IQ VIN = 3.3V VIN = 6.5V, VSHDN = Open
2.2 85 0.01
6.5 150 2.00
V A A
OUT Output Voltage (1) (Internal Fixed Voltage) Line Regulation(1) Load Regulation(1) REG(LINE) REG(LOAD) VIN = (VOUT + 0.25V) to 5.5V, IOUT = 10mA VIN = VOUT + 0.7V VOUT VIN = VOUT + 0.7V, IOUT = 10mA -1% -2% 0.1 0.15 VOUT +1% +2% 0.4 0.40 % % V
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SC1563
POWER MANAGEMENT Electrical Characteristics
Unless specified: VSHDN = 0V, Adjustable mode (VADJ > VTH(ADJ)): VIN = 2.2V to 5.5V and IOUT = 0A to 500mA, Fixed mode (VADJ = GND): VIN = (VOUT + 0.7V) to 5.5V and IOUT = 0A to 500mA. Values in bold apply over full operating temperature range.
Parameter OUT (Cont.) Dropout Voltage(1)(2)
Symbol
Conditions
Min
Typ
Max
Units
VD
IOUT = 2mA
1
5 10
mV
IOUT = 100mA
70
100 150
mV
IOUT = 250mA
175
250 350
mV
IOUT = 500mA
350
500 700
mV
Current Limit ADJ Reference Voltage(1)
ILIM
0.5
1.0
A
VREF
VIN = 2.2V, VADJ = VOUT, IOUT = 10mA
1.188 1.176
1.200
1.212 1.224
V
Adjust Pin Current(3) Adjust Pin Threshold(4) SH D N Shutdown Pin Current Shutdown Pin Threshold
IADJ VTH(ADJ)
VADJ = VREF 0.10
65 0.25
150 0.40
nA V
ISHDN VIH VIL
VSHDN = 0V, VIN = 3.3V VIN = 3.3V VIN = 3.3V 1.8
1.5
5.0
A V
0.4
Over Temperature Protection High Trip Level Hysteresis THI THYST 170 10 C C
Notes: (1) Low duty cycle pulse testing with Kelvin connections required. (2) Defined as the input to output differential at which the output voltage drops to 1% below the value measured at a differential of 0.7V for 2.5V VOUT 3.4V. Not measurable on outputs less than 2.2V due to minimum VIN constraints. See typical characteristics curves. (3) Guaranteed by design. (4) When VADJ exceeds this threshold, the "Sense Select" switch disconnects the internal feedback chain from the error amplifier and connects VADJ instead.
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SC1563
POWER MANAGEMENT Pin Configurations
Top View
Ordering Information
Part Number(1)(2)(3) SC1563ISK-X.XTR SC1563ISK-X.XTRT(4) SOT-23-5 P ackag e
SOT-23-5
Notes: (1) Where -X.X denotes voltage options. Available voltages are: 1.8V, 2.5V, 2.8V, 3.0V, 3.1V and 3.3V. (2) Output voltage can be adjusted using external resistors, see Pin Descriptions. (3) Only available in tape and reel packaging. A reel contains 3000 devices. (4) Lead free product. This product is fully WEEE and RoHS compliant.
Marking Information
SOT-23-5
63XX = SC1563, voltage option (example: 6318 for 1.8V option) yyww = Date code (example: 0008 for week 8 of 2000)
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SC1563
POWER MANAGEMENT Block Diagram
Pin Descriptions
Pin # 1 Pin Name Pin Function SHDN Shutdown Input. Leavi ng thi s pi n open turns the regulator off, reduci ng the qui escent current to a fraction of its operating value (typically < 300nA). The device will be enabled if this pin is pulled below 0.4V. Connect to GND if not being used. Reference ground. This pin may be used for heatsinking purposes. Thi s pi n, when grounded, sets the output voltage to that set by the i nternal feedback resi stors. If external feedback resistors are used, the output voltage will be (See Application Circuit on page 1):
VOUT = 1.200 (R1 + R2) Volts R2
2 3
GND AD J
4 5
OUT IN
This pin is the power output of this device, sourcing up to 500mA. Input voltage. For regulation at full load, the input to this pin must be between (VOUT + 0.7V) and 6.5V. Minimum VIN = 2.2V.
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SC1563
POWER MANAGEMENT Applications Information
Introduction The SC1563 is intended for applications such as graphics cards where high current capability and very low dropout voltage are required. It provides a very simple, low cost solution that uses little pcb real estate. Additional features include a shutdown pin to allow for a very low power consumption standby mode, and a fully adjustable output. Component Selection Input capacitor - a 1F ceramic capacitor is recommended. This allows for the device being some distance from any bulk capacitance on the rail. Additionally, input droop due to load transients is reduced, improving load transient response. Additional capacitance may be added if required by the application. Output capacitor - a minimum bulk capacitance of 1F, along with a 0.1F ceramic decoupling capacitor is recommended. Increasing the bulk capacitance will improve the overall transient response. The use of multiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance will not cause stability issues. Although designed for use with ceramic output capacitors, the SC1563 is extremely tolerant of output capacitor ESR values and thus will also work comfortably with tantalum output capacitors. Noise immunity - in very electrically noisy environments, it is recommended that 0.1F ceramic capacitors be placed from IN to GND and OUT to GND as close to the device pins as possible. External voltage selection resistors - the use of 1% resistors, and designing for a current flow 10A is recommended to ensure a well regulated output (thus R2 120k). Thermal Considerations The power dissipation in the SC1563 is approximately equal to the product of the output current and the input to output voltage differential:
PD (VIN - VOUT ) * IOUT
The absolute worst-case dissipation is given by:
PD( MAX ) = (VIN(MAX ) - VOUT (MIN ) )* IOUT (MAX ) + VIN(MAX ) * IQ(MAX )
For a typical scenario, VIN = 3.3V 5%, VOUT = 2.5V and IOUT = 500mA, therefore: VIN(MAX) = 3.465V, VOUT(MIN) = 2.450V and IQ(MAX) = 150A, Thus PD(MAX) = 0.508W. Using this figure, and assuming TA(MAX) = 70C, we can calculate the maximum thermal impedance allowable to maintain TJ 150C:
R TH( J- A )(MAX ) =
(T
J(MAX )
- TA (MAX ) )
PD(MAX )
=
(150 - 70) = 157C / W
0.508
This should be achievable with the SOT-23-5 package using pcb copper area to aid in conducting the heat away from the device. Internal ground/power planes and air flow will also assist in removing heat.
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SC1563
POWER MANAGEMENT Typical Characteristics
Quiescent Current vs. Junction Temperature vs. Output Current
150 125 100 IQ (A) 75 50 25 0 -50 -25 0 25 50 TJ (C) 75 100 125 150 10 3.0 3.5 4.0 4.5 VIN (V) 5.0 5.5 6.0 6.5 IOUT = 500mA IQ (A) 1000 IOUT = 500mA VIN = 3.3V, VADJ = VOUT 10000 VADJ = VOUT
Quiescent Current vs. Input Voltage vs. Output Current
IOUT = 0mA
100 IOUT = 0mA
Output Voltage vs. Junction Temperature vs. Output Current
0.5 0.4 VOUT Deviation (%V OUT(NOM)) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -50 -25 0 25 50 TJ (C) 75 100 125 150 IOUT = 500mA IOUT = 0mA REGLINE (%VOUT(NOM)) VIN = VOUT(NOM) + 0.7V
Line Regulation vs. Junction Temperature vs. Input Voltage Change
0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 -50 -25 0 25 50 TJ (C) 75 100 125 150 VIN = (VOUT(NOM) + 0.25V) to 5.5V IOUT = 10mA
Load Regulation vs. Junction Temperature
0.20 0.18 0.16 REGLOAD (%VOUT(NOM)) 0.14 VD (mV) 0.12 0.10 0.08 0.06 0.04 0.02 0.00 -50 -25 0 25 50 TJ (C) 75 100 125 150 100 0 VIN = VOUT(NOM) + 0.7V IOUT = 0mA to 500mA 700 600 500 400 300 200
Dropout Voltage (IOUT = 0.5A) vs. Output Voltage vs. Junction Temperature
TJ = 150C
TJ = 25C
TJ = -40C
2.2
2.4
2.6
2.8
3.0
3.2
3.4 VOUT (V)
3.6
3.8
4.0
4.2
4.4
4.6
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SC1563
POWER MANAGEMENT Typical Characteristics (Cont.)
Dropout Voltage (IOUT = 0.25A) vs. Output Voltage vs. Junction Temperature
400 350 300 250 VD (mV) 200 150 100 50 0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 VOUT (V) 3.6 3.8 4.0 4.2 4.4 4.6 TJ = -40C 25 0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 VOUT (V) 3.6 3.8 4.0 4.2 4.4 4.6 TJ = 25C VD (mV) TJ = 150C 100 TJ = 25C 75 50 TJ = -40C 150 125
Dropout Voltage (IOUT = 0.1A) vs. Output Voltage vs. Junction Temperature
TJ = 150C
Current Limit vs. Junction Temperature
1000 950 900 850 ILIM (mA) VREF (V) 800 750 700 650 600 550 500 -50 -25 0 25 50 TJ (C) 75 100 125 150
Reference Voltage (VIN = 2.2V) vs. Junction Temperature vs. Output Current
1.205 1.204 1.203 1.202 1.201 1.200 1.199 1.198 1.197 1.196 1.195 -50 -25 0 25 50 TJ (C) 75 100 125 150 IOUT = 500mA IOUT = 0mA VIN = 2.2V
VIN = VOUT(NOM) + 0.7V
Reference Voltage (VIN = 5.5V) vs. Junction Temperature vs. Output Current
1.210 1.208 1.206 1.204 VREF (V) 1.202 1.200 1.198 1.196 1.194 1.192 1.190 -50 -25 0 25 50 TJ (C) 75 100 125 150 IOUT = 500mA IOUT = 0mA IADJ (nA) VIN = 5.5V 100 90 80 70 60 50 40 30 20 10 0 -50 -25 VIN = 6.5V VADJ = VREF
Adjust Pin Current vs. Junction Temperature
0
25
50 TJ (C)
75
100
125
150
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SC1563
POWER MANAGEMENT Typical Characteristics (Cont.)
Adjust Pin Threshold Voltage vs. Junction Temperature
400 375 350 325 VTH(ADJ) (mV) 300 275 250 225 200 175 150 125 100 -50 -25 0 25 50 TJ (C) 75 100 125 150 ISHDN (A) 2.2V VIN 6.5V 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 -50 -25 0 25 50 TJ (C) 75 100 125 150 VIN = 3.3V VSHDN = 0V
Shutdown Pin Current vs. Junction Temperature
Shutdown Pin Threshold Voltage vs. Junction Temperature vs. Input Voltage
1.8 1.6 1.4 VIH, VIL (V) 1.2 1.0 0.8 0.6 0.4 -50 -25 0 25 50 TJ (C) 75 100 125 150 VIL, VIN = 2.2V VIL, VIN = 6.5V VIH, VIN = 2.2V VIH, VIN = 6.5V
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SC1563
POWER MANAGEMENT Outline Drawing - SOT-23-5
A e1 N
EI
DIM
D
A A1 A2 b c D E1 E e e1 L L1 N 01 aaa bbb ccc A
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.035 .000 .035 .010 .003 .110 .060 .045 .057 .006 .051 .020 .009 .118 .069 0.90 0.00 .90 0.25 0.08 2.80 1.50 1.15 1.45 0.15 1.30 0.50 0.22 3.00 1.75
2X E/2
E
1 ccc
2X N/2 TIPS
2
e B D
aaa C
A2 SEATING PLANE
.114 .063 .110 BSC .037 BSC .075 BSC .012 .018 .024 (.024) 5 0 10 .004 .008 .008
2.90 1.60 2.80 BSC 0.95 BSC 1.90 BSC 0.30 0.45 0.60 (0.60) 5 0 10 0.10 0.20 0.20
C
A1 bxN
H
bbb
C A-B D
GAGE PLANE 0.25 L (L1)
c
01
SEE DETAIL SIDE VIEW
A
DETAIL
A
NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
Land Pattern - SOT-23-5
X
DIM
(C) G Y P Z C G P X Y Z
DIMENSIONS MILLIMETERS INCHES
(.098) .055 .037 .024 .043 .141 (2.50) 1.40 0.95 0.60 1.10 3.60
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
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