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SC1564 Low Dropout 600mA Linear Regulator in 3mm x 3mm Package
Description
The SC564 is a high performance positive voltage regulator designed for use in applications requiring low dropout voltages up to 600mA. 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 SC564 has a shutdown pin to further reduce power dissipation while in shut down mode. The SC564 provides excellent regulation in line, load and temperature variations. The output voltage of every device can be selected to be .5V or adjusted between .2V and 4.55V. The SC564 comes in a space-saving 3mm x 3mm x mm MLPD-8 package.
POWER MANAGEMENT Features

VIN range: 2.7V to 5.5V Fixed .5V or adjustable output voltage 600mA output current Operate with ceramic capacitors 2A quiescent current in shutdown No minimum load current requirement Over-current and over-temperature protection Reverse voltage protection 3mm x 3mm x mm MLPD-8 package ( WEEE and RoHS compliant )
Applications
Personal digital assistants Battery powered systems Motherboards Peripheral cards PCMCIA cards

Typical Application Circuit
VIN (3.3V) CIN Enable
IN
VOUT (1.5V) OUT ADJ COUT
SHDN
GND
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February 07, 2008
SC1564
Pin Configuration Ordering Information
Part Number
SC564ML-.5TRT()(2)(3)
Package
3mm x 3mm x mm MLPD-8 Evaluation Board
IN NC NC OUT
1
TOP VIEW
8
GND SHDN NC ADJ
SC564-.5EVB
2
7
3 T
6
Notes: () Output voltage can be adjusted using external resistors, see Pin Descriptions. (2) Only available in tape and reel packaging. A reel contains 3000 devices. (3) Available in lead-free package only. Device is WEEE and RoHS compliant.
4
5
3mm x 3mm x mm MLPD-8
JA = 4C/W
Marking Information
CB15 yyww xxxx
TOP MARK CHAR ROWS 4/4/4 3
Marking for the 3 x 3mm MLPD 8 Lead Package: nnnn = Part Number (Example: CB15) - Reference Part No. Code for small MLP yyww = Datecode (Example: 0752) xxxx = Semtech Lot No. (Example: E901)
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Absolute Maximum Ratings
IN Voltage ....................................... -0.3V to +7V OUT Voltage ....................................... -0.3V to VIN ADJ Voltage ....................................... -0.3V to VIN SHDN Voltage .................................... -0.3V to VIN
Recommended Operating Conditions
IN Voltage Range .............................. 2.7 to 5.5V Maximum Output Current ........................ 600mA Junction Temperature ..................... -40 to 50C
Thermal Information
Thermal Resistance, Junction to Ambient() .... 4C/W Storage Temperature ..................... -65 to +50C Peak IR Reflow Temperature (0s to 30s) ...... +260C
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended.
NOTES: () Calculated from package in still air, mounted to 3" x 4.5", 4 layer FR4 PCB with thermal vias under the exposed pad per JESD5 standards. (2) This device is ESD sensitive. Use of standard ESD handling precautions is required.
Electrical Characteristics
Unless specified: VSHDN = 0V, Adjustable mode: (VADJ = VREF), Fixed mode: (VADJ = GND), VIN = 2.7V to 5.5V and IOUT = 0mA to 600mA. Values in bold apply over full operating temperature range.. TJ= -40C to 50C, typical value are at TJ= 25C.
Parameter
Input Supply IN Voltage Range Quiescent Current Output OUT Voltage() (Internal Fixed Voltage) Line Regulation()(2) Load Regulation() Current Limit()(3)
Symbol
Conditions
Min
Typ
Max
Units
VIN IQ VIN = 3.3V VIN = VSHDN = 5.5V
2.7 85 0.0
5.5 170 2.00
V A
VOUT
VIN = 3.3V, IOUT = 0mA, TA = 25C VIN = 2.7V to 5.5V, IOUT = 0mA, TJ 0C VIN = 2.7V
.482 1.467
.500 0.0 0.15
.58 1.533 0.40 0.40 1.10
V % % A mV
REG(LINE) REG(LOAD) ILM
0.65 IOUT = 0mA IOUT = 00mA 70 20 420
5 185 300 425 600 835
mV mV
Dropout Voltage(2)
VD
IOUT = 300mA IOUT = 600mA
mV
3
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Electrical Characteristics (continued)
Parameter
Reference .86 Reference Voltage() ADJ Pin Current(4) ADJ Pin Threshold(5) Shutdown SHDN Pin Current ISHDN VIH VIL Over Temperature Protection High Trip Level Hysteresis THI THYST 70 0 C C VSHDN = 0V, VIN = 3.3V VIN = 3.3V VIN = 3.3V 1.8 0.4 .5 5.0 A V VREF IADJ VADJ-TH VIN = 3.3V, VADJ = VOUT, IOUT = 0mA VIN = 3.3V, VADJ = VREF VIN = 3.3V, VADJ = VREF 0.10 1.174 65 0.25 .200 .24 1.226 150 0.40 nA V V
Symbol
Conditions
Min
Typ
Max
Units
SHDN Pin Threshold
Notes: () Low duty cycle pulse testing with Kelvin connections required. (2) Defined as the input to output differential at which the output voltage drops to % below the value measured at a differential of 0.95V for 2.2V VOUT 4.55V at adjustable mode configuration. Not measurable on outputs less than 2.2V due to minimum VIN constraints. See typical characteristics curves. (3) Defined as the output current at which the output voltage drops to 2% below the value measured at output current of 0mA. (4) Guaranteed by design. (5) When VADJ exceeds this threshold, the "Sense Select" switch disconnects the internal feedback chain from the error amplifier and connects VADJ instead.
4
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Typical Characteristics
Quiescent Current vs Junction Temperature

Line Regulation vs Junction Temperature

Quiescent Current at Shutdown

Load Regulation vs Junction Temperature

Output Voltage vs Junction Temperature

Current Limit vs Junction Temperature

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Typical Characteristics
Dropout Voltage vs Output Voltage @ Iout= 100mA

ADJ Pin Current vs Junction Temperature
Dropout Voltage vs Output Voltage @ Iout= 300mA

SHDN Pin Current vs Junction Temperature

Dropout Voltage vs Output Voltage @ Iout= 600mA

SHDN Pin Threshold vs Junction Temperature

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Pin Descriptions
Pin #
2 3 4
Pin Name
IN NC NC OUT
Pin Function
Input voltage. For regulation at full load, the input to this pin must be between (VOUT + 0.95V) and 5.5V. Minimum VIN = 2.7V. No connect No connect This pin is the power output of this device, sourcing up to 600mA. This pin sets the output voltage when grounded by the set of internal feedback resistors. If external feedback resistors are used, the output voltage will be:
5
ADJ
VOUT
1.200 (R 1 R2
R2)
V
R1: The resistor connected from OUT to ADJ. R2: The resistor connected from ADJ to GND.
6
NC
No connect Shutdown Input. Pulling this pin high turns the regulator off, reducing the quiescent 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. Thermal pad for heatsinking purposes. Not connected internally
7
SHDN
8 T
GND Thermal Pad
7
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Block Diagram
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Applications Information
Introduction
The SC564 is intended for applications such as graphics cards where high current capability and 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.
Thermal Considerations
The power dissipation in the SC564 is approximately equal to the product of the output current and the input to output voltage differential:
PO (VIN VOUT ) I OUT
The absolute worst-case dissipation is given by:
PO(MAX) = ( VIN(MAX) - VOUT(MIN) ) IOUT(MAX) + VIN(MAX) IQ(MAX)
Component Selection
Input capacitor: A F ceramic capacitor is recommended. This allows for the device 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 F, along with a 0.F 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 SC564 is extremely tolerant of output capacitor ESR values and thus will also work comfortably with tantalum output capacitors. Noise immunity: In very electrically noisy environents, it is recommended that 0.F 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 % resistors, designed for a current flow 0A is recommended to ensure a well-regulated output (tus, R2 20k).
For a typical scenario, VIN = 3.3V 5%, VOUT = .5V and IOUT = 600mA, therefore: VIN(MAX) = 3.465V, VOUT(MIN) = .47V and IQ(MAX) = 70A, Thus PD(MAX) = .976W. Using this figure, and assuming TA(MAX) = 85C, we can calculate the maximum thermal impedance allowable to maintain TJ 50C:
R TH(J TJ(MAX) TA(MAX) PO(MAX) 150 C 85 C 1.1976W 54.3 C
A)(MAX)
W
This should be achievable with the 3mm x 3mm MLPD-8 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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Outline Drawing -- 3mm x 3mm MLPD-8
A D B
DIM
A A1 A2 b D D1 E E1 e L N aaa bbb
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.031 .035 .039 .000 .001 .002 (.008) .010 .012 .014 .114 .118 .122 .085 .098 .114 .118 .122 .053 .069 .026 BSC .012 .016 .020 8 .003 .004 0.80 0.90 1.00 0.00 0.02 0.05 (0.20) 0.25 0.30 0.35 2.90 3.00 3.10 2.15 2.48 2.90 3.00 3.10 1.35 1.75 0.65 BSC 0.30 0.40 0.50 8 0.08 0.10
E PIN 1 INDICATOR (LASER MARK)
A aaa C D1 1 LxN E/2 E1 2 A1 A2 C
SEATING PLANE
N e e/2 D/2
NOTES:
bxN bbb CAB
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS.
0
SC1564
Land Pattern -- 3mm x 3mm MLPD-8
K Y
DIM
G Z C G H K P X Y Z
DIMENSIONS INCHES MILLIMETERS
(.116) .087 .067 .102 .026 .016 .030 .146 (2.95) 2.20 1.70 2.58 0.65 0.40 0.75 3.70
(C)
H
X
P
NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 3. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD SHALL BE CONNECTED TO A SYSTEM GROUND PLANE. FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEVICE.
Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 9302 Phone: (805) 498-2 Fax: (805) 498-3804 www.semtech.com

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