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Dual 150mA Ultra Low Dropout, Low Noise Regulator
POWER MANAGEMENT Description
The SC1456 contains two low dropout linear regulators that operate from a +2.5V to +6V input range and deliver up to 150mA. PMOS pass transistors allow a low 110A supply current per device to remain independent of load, making these devices ideal for battery operated portable equipment such as cellular phones, cordless phones and personal digital assistants. Each device can be powered from a separate supply voltage or the same supply voltage for maximum flexibility. The output voltage of each device can be preset or adjusted with an external resistor divider. Other features include independant low powered shutdown, short circuit protection, thermal shutdown protection and reverse battery protection for each regulator. The SC1456 comes in the tiny 10 lead MSOP package (lead free, fully WEEE and RoHS compliant available).
SC1456
Features
Two guaranteed 150 mA outputs Designed to operate with ceramic capacitors Fixed or adjustable outputs Very small external components Low 75VRMS output noise Very low supply currents Thermal overload protection Reverse battery protection Individual low power shutdown Full industrial temperature range Surface mount packaging (10 pin MSOP)
Applications
Battery Powered Systems Cellular Telephones Cordless Telephones Personal Digital Assistants Portable Instrumentation Modems PCMCIA cards
9 4 3 8 C3 1uF C4 1uF
Typical Application Circuits
VIN1 10 1 VIN2 (OR VIN1) C1 1uF C2 1uF 5 6 U1 IN1 EN1 IN2 EN2 GND 2 GND 7 SC1456 OUT1 OUT2 SET1 SET2
VOUT1 = PRESET VOUT2 = PRESET
Output Voltages Set Internally
U1 IN1 EN1 IN2 EN2 GND 2 GND 7 R2 SC1456 OUT1 OUT2 SET1 SET2
VIN1
10 1
9 4 3 8 R1 C3 2.2uF C4 1uF
VOUT1 (SEE EQUATION) VOUT2 = PRESET
VIN2 (OR VIN1) C1 1uF C2 1uF
5 6
R1 VOUT1 = 1.250 * 1 + R2 R 2 120k
Output 1 Set Externally and Output 2 Set Internally
Revision: November 16, 2005 1 www.semtech.com
SC1456
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 VEN1, VEN2, VSET1, VSET2, VIN1, VIN2, VOUT1, VOUT2 to GND Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 sec ESD Rating
Symbol VPIN J A J C TA TJ TSTG TLEAD V ESD
Maximum -0.3 to +7 120 45 -40 to +85 -40 to +125 -65 to +150 300 1.25
Units V C/W C/W C C C C kV
Electrical Characteristics(1)
Unless specified: VINx = 3.6V, VSETx = GND, VENx = 3.6V, TA = 25C. Values in bold apply over full operating ambient temperature range.
Parameter IN1, IN2 Supply Voltage Range Supply Current
Symbol
Test Conditions
Min
Typ
Max
Units
VIN IQ IOUT = 0mA
2.5 90
6.0 130 160
V A
50mA IOUT 150mA
110
160 200
A
V E N = 0V
0.0001
1 2
A
OUT1, OUT2 Output Voltage(2) VOUT IOUT = 1mA 1mA IOUT 150mA, VOUT + 1V VIN 5.5V Line Regulation(2) REG(LINE) 2.5V VIN 5.5V, VSET = VOUT, IOUT = 1mA -2.0% -3.5% 5 VOUT +2.0% +3.5% 10 12 Load Regulation(2) REG(LOAD) IOUT = 0mA to 50mA -10 -15 -20 IOUT = 0mA to 100mA -15 -20 -25 mV mV mV V
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SC1456
POWER MANAGEMENT Electrical Characteristics (Cont.)(1)
Unless specified: VINx = 3.6V, VSETx = GND, VENx = 3.6V, TA = 25C. Values in bold apply over full operating ambient temperature range.
Parameter Load Regulation (Cont.)(2)
Symbol REG(LOAD)
Test Conditions IOUT = 0mA to 50mA, VSET = VOUT IOUT = 0mA to 100mA, VSET = VOUT
Min
Typ -2.5
Max -7.5 -15.0
Units mV
-5
-15 -30
mV
Dropout Voltage(2)(3)
VD
IOUT = 1mA IOUT = 50mA IOUT = 100mA
1.1 55 90 120 110 180 240
mV mV
mV
Current Limit Output Voltage Noise
ILIM en PSRR 10Hz to 99kHz, IOUT = 50mA, COUT = 1F 10Hz to 99kHz, IOUT = 50mA, COUT = 100F f = 120Hz
150
240 90 75 55
350
mA VRMS dB
Power Supply Rejection Ratio E N 1, E N 2 EN Input Threshold
VIH VIL
1.8 0.4 VEN = VIN 0 100 200
V
EN Input Bias Current(4)
IEN
nA
S E T 1, S E T 2 Sense/Select Threshold SET Reference Voltage(2) VTH V SET ISET IOUT = 1mA 1mA IOUT 150mA, 2.5V VIN 5.5V SET Input Leakage Current(4) Over Temperature Protection High Trip Level Hysteresis THI THYST 170 10 C C VSET = 1.3V 20 1.225 1.206 0.015 55 1.250 80 1.275 1.294 2.500 5.000 nA mV V
Notes: (1) This device is ESD sensitive. Use of standard ESD handling precautions is required. (2) Low duty cycle pulse testing with Kelvin connections required. (3) Defined as the input to output differential at which the output voltage drops 100mV below the value measured at a differential of 2V. (4) Guaranteed by design.
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SC1456
POWER MANAGEMENT Pin Configuration
Top View
Ordering Information
Part Number SC1456XIMSTR(1)(2) SC1456XIMSTRT(1)(2)(3) P ackag e MSOP-10 MSOP-10
MSOP-10
Notes: (1) Where X denotes voltage options - see table below. Consult factory for other voltage options. (2) Only available in tape and reel packaging. A reel contains 2500 devices. (3) Lead free product. Fully WEEE and RoHS compliant.
Voltage Options
Replace X in the part number (SC1456XIMSTR) by the letter shown below for the corresponding voltage options:
X A B C D
VOUT1 (V) 2.5 2.8 3.0 3.3
VOUT2 (V) 2.5 2.8 3.0 3.3
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SC1456
POWER MANAGEMENT Block Diagram
Pin Descriptions
Pin 1 2 3 Pin Name EN1 GND SET 1 Pin Function Active high enable pin for device 1. Connect to VIN1 if not being used. Ground pin. Can be used for heatsinking if needed. Electrically connected to pin 7. Connecting this pin to ground results in the internally preset value for VOUT1. Connecting to an external resistor divider changes VOUT1 to:
R1 VOUT 1 = 1 .250 * 1 + R2
4 5 6 7 8
OUT2 IN2 EN2 GND SET2
Regulator output for device 2, sourcing up to 150mA. Supply input pin for device 2. Active high enable pin for device 2. Connect to VIN2 if not being used. Ground pin. Can be used for heatsinking if needed. Electrically connected to pin 2. Connecting this pin to ground results in the internally preset value for VOUT2. Connecting to an external resistor divider changes VOUT2 to:
R1 VOUT 2 = 1 .250 * 1 + R2
9 10
OUT1 IN1
Regulator output for device 1, sourcing up to 150mA Supply input pin for device 1.
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SC1456
POWER MANAGEMENT Typical Characteristics
Output Voltage (2.8V) vs. Output Current
2.86 2.85 2.84 2.83 2.82 VOUT (V) VOUT (V) 2.81 2.80 2.79 2.78 2.77 2.76 2.75 2.74 0 25 50 75 IOUT (mA) 100 125 150 VIN = 3.6V TJ = 25C 2.86 2.85 2.84 2.83 2.82 2.81 2.80 2.79 2.78 2.77 2.76 2.75 2.74 -50 -25 0 25 50 75 100 125 TJ (C)
IO = 1mA IO = 50mA IO = 100mA IO = 150mA
Output Voltage (2.8V) vs. Junction Temperature vs. Output Current
VIN = 3.6V
SET Reference Voltage vs. Output Current
1.275 1.270 1.265 1.260 VSET (V) VSET (V) 1.255 1.250 1.245 1.240 1.235 1.230 1.225 0 25 50 75 IOUT (mA) 100 125 150 VIN = 3.6V TJ = 25C 1.290 1.280 1.270 1.260 1.250 1.240 1.230 1.220 1.210
SET Reference Voltage vs. Junction Temperature vs. Output Current
VIN = 3.6V
IO = 1mA IO = 50mA IO = 100mA IO = 150mA
-50
-25
0
25
50
75
100
125
TJ (C)
Dropout Voltage vs. Output Current vs. Junction Temperature
250 225 200 175 VD (mV) 150 125 100 75 50 25 0 0 25 50 75 IOUT (mA) 100 125 150 0 -50 -25
-40C 25C 125C
Line Regulation vs. Junction Temperature
12 10 8 6 4 2 VIN = 2.5V to 5.5V SET = OUT IOUT = 1mA
SET = GND
REG(LINE) (mV)
0
25 TJ (C)
50
75
100
125
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SC1456
POWER MANAGEMENT Typical Characteristics (Cont.)
Load Regulation (VSET = GND) vs. Junction Temperature
50 45 40 REG(LOAD) (mV) 35 30 25 20 15 10 5 0 -50 -25 0 25 TJ (C) 50 75 100 125 IOUT = 0mA to 50mA IOUT = 0mA to 100mA VIN = 3.6V SET = GND IOUT = 0mA to 150mA REG(LOAD) (mV) 20.0 17.5 15.0 12.5 10.0 7.5 5.0 2.5 0.0 -50 -25 0 25 TJ (C) 50 75 100 125 IOUT = 0mA to 50mA IOUT = 0mA to 100mA
Load Regulation (VSET = VOUT) vs. Junction Temperature
VIN = 3.6V SET = OUT IOUT = 0mA to 150mA
Supply Current vs. Output Current
120 110 100 90 80 IQ (A) IQ (A) 70 60 50 40 30 20 10 0 VIN = 3.6V TJ = 25C 0 25 50 75 IOUT (mA) 100 125 150 25 0 -50 -25 100 75 50 125 150
Supply Current vs. Junction Temperature
VIN = 3.6V IOUT = 150mA
0
25 TJ (C)
50
75
100
125
Current Limit vs. Junction Temperature
350 300 250 VIH, VIL (V) ILIM (mA) 200 150 100 50 0 -50 -25 0 25 TJ (C) 50 75 100 125 VIN = 3.6V 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 -50
Enable Input Threshold vs. Junction Temperature
VIN = 3.6V
VIH
VIL
-25
0
25 TJ (C)
50
75
100
125
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SC1456
POWER MANAGEMENT Typical Characteristics (Cont.)
Sense/Select Threshold vs. Junction Temperature
80 70 60 en (V/Hz) VTH (mV) 50 40 30 COUT = 100F 20 -50 -25 0 25 TJ (C) 50 75 100 125 0.01 0.1 1 f (kHz) 10 100 1 COUT = 1F VIN = 3.6V 10 SC1456B VIN = 3.6V IOUT = 50mA TJ = 25C
Output Spectral Noise Density vs. Frequency
0.1
Applications Information
Theory Of Operation The SC1456 is intended for applications where very low dropout voltage, low supply current, low output noise and pcb real estate are critical. It provides a very simple, low cost solution for two seperate regulated outputs. Internally preset output voltage options require the use of only four external capacitors for operation. Each regulator has both fixed and adjustable output voltage modes. Grounding the SET pin (pulling it below the Sense/Select threshold of 55mV) will connect the internal resistor divider of that regulator to the error amplifier resulting with the internally preset output voltage. If SET is pulled above this threshold, then the Sense/Select switch will connect the SET pin to the error amplifier. The output will be regulated such that the voltage at SET will equal VSET, the SET reference voltage (typically 1.250V). An active high enable pin (EN) is provided for each output to allow the customer to shut down that regulator and enter an extremely low power Off-state. A logic Low signal will reduce the regulator's supply current to 0.1nA. Component Selection - General Output capacitor: Semtech recommends a minimum capacitance of 1F at each output with an equivalent
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series resistance (ESR) of <1 over temperature. Ceramic capacitors are ideal for this application. Increasing the bulk capacitance will further reduce output noise and improve the overall transient response. Input capacitor: Semtech recommends the use of a 1F ceramic capacitor at each input. 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. Component Selection - Externally Set Output Please refer to Figure 1 on page 9. The output voltage of both outputs (OUT1 shown here) can be externally adjusted anywhere within the range from 1.25V to (VIN(MIN) - VD(MAX)). The output voltage will be in accordance with the following equation:
R1 VOUT = 1.250 * 1 + R2
1% tolerance resistors are recommended. The values of R1 and R2 should be selected such that the current flow through them is 10A (thus R2 120k). At high input voltages and/or high output currents, stability may be improved by increasing C2 to 2.2F and reducing R2 to 10k. See "Component Selection - General" for input capacitor requirements.
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SC1456
POWER MANAGEMENT Applications Information (Cont.)
VIN1 10 1 VIN2 (OR VIN1) C1 1uF C2 1uF 5 6 U1 IN1 EN1 IN2 EN2 GND 2 GND 7 R2 SC1456 OUT1 OUT2 SET1 SET2 9 4 3 8 R1 C3 2.2uF C4 1uF VOUT1 (SEE EQUATION) VOUT2 = PRESET
Figure 1: Output 1 Set Externally and Output 2 Set Internally Thermal Considerations The worst-case power dissipation for this part is given by: With the standard MSOP-10 Land Pattern shown at the end of this datasheet, and minimum trace widths, the thermal impedance junction to ambient for SC1456 is 113C/W. Thus with no additional heatsinking, TJ(MAX) = 119C. The junction temperature can be reduced further by the use of larger trace widths, and connecting pcb copper area to the GND pins (pins 2 and 7), which connect directly to the device substrate. Lower junction temperatures improve overall output voltage accuracy. Layout Considerations While layout for linear devices is generally not as critical as for a switching application, careful attention to detail will ensure reliable operation. 1) Attaching the part to a larger copper footprint will enable better heat transfer from the device, especially on PCBs where there are internal ground and power planes. 2) Place the input and output capacitors close to the device for optimal transient response and device behavior. 3) Connect all ground connections directly to the ground plane. If there is no ground plane, connect to a common local ground point before connecting to board ground.
PD(MAX ) = (VIN1(MAX ) - VOUT1(MIN) ) * IOUT1(MAX ) + VIN1(MAX ) * IQ1(MAX ) + (VIN2(MAX ) - VOUT 2(MIN) ) * IOUT 2(MAX ) + VIN2(MAX ) * IQ 2(MAX )
For all practical purposes, it can be reduced to:
PD(MAX ) = (VIN1(MAX ) - VOUT1(MIN) ) * IOUT1(MAX )
+ (VIN2( MAX ) - VOUT 2(MIN) ) * IOUT 2(MAX )
Looking at a typical application: VIN1(MAX) = VIN2(MAX) = 4.2V VOUT1(MIN) = VOUT2(MIN) = (2.8V - 3.5%) = 2.702V worst-case IOUT1 = IOUT2 = 100mA TA = 85C This gives us:
PD(MAX) = 2 * (4.2 - 2.702) * 0.100 = 300mW
Using this figure, we can calculate the maximum thermal impedance allowable to maintain TJ 125C:
( J- A )(MAX ) =
(T
J( MAX )
- TA (MAX ) )
PD(MAX )
=
(125 - 85 ) = 133C / W
0.300
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SC1456
POWER MANAGEMENT Outline Drawing - MSOP-10
e A N 2X E/2 PIN 1 INDICATOR ccc C 2X N/2 TIPS 12 B E1 E D
DIM
A A1 A2 b c D E1 E e L L1 N 01 aaa bbb ccc
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.043 .000 .006 .030 .037 .007 .011 .003 .009 .114 .118 .122 .114 .118 .122 .193 BSC .020 BSC .016 .024 .032 (.037) 10 8 0 .004 .003 .010 1.10 0.00 0.15 0.95 0.75 0.17 0.27 0.08 0.23 2.90 3.00 3.10 2.90 3.00 3.10 4.90 BSC 0.50 BSC 0.40 0.60 0.80 (.95) 10 0 8 0.10 0.08 0.25
D aaa C SEATING PLANE A2 C A1 bxN bbb C A-B D A GAGE PLANE 0.25 (L1) DETAIL SIDE VIEW SEE DETAIL L H c
01
A
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. 4. REFERENCE JEDEC STD MO-187, VARIATION BA.
Land Pattern - MSOP-10
X
DIM
(C) G Z C G P X Y Z
DIMENSIONS INCHES MILLIMETERS
(.161) .098 .020 .011 .063 .224 (4.10) 2.50 0.50 0.30 1.60 5.70
Y P
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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