SC563

SC563
Dual Output 300mA LDO
Linear Regulator
POWER MANAGEMENT
Description
Features
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The SC563 is a dual output, low dropout linear voltage
regulator designed for use in battery powered applications and other applications with space constraints and
low power requirements. The SC563 provides fixed output
voltages up to 300mA of load current per channel. Fixed
output voltages for each output eliminates the need for
external feedback resistors.
Input voltage range — 2.3V to 5.5V
Two 300mA (maximum) outputs
Dropout at 300mA load — 180mV (Typ)
Quiescent supply current — 50μA (x2)
Shutdown current — 100nA
Output noise — 100μVRMS /V
Over-temperature protection
Short-circuit protection
Under-voltage lockout
Internal output discharge 100W
MLPD-UT8, 1.6mm x 1.2mm x 0.6mm package
The device has separate input, output and enable pins for
each LDO channel. Using the lowest possible input
voltage for each output voltage reduces the power loss
for each rail. This improves overall package thermal performance and efficiency compared to single input voltage
devices.
Applications
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Consumer electronics
Wearable & Portable electronics
Cell phones
GPS devices
Set top boxes/HDTVs
Communication electronics
Industrial electronics
The device has fast turn-on and turn-off voltage slew rate
for fast system start up and reset response. Low quiescent
current extends battery life.
The SC563 family of devices provide protection circuitry
such as short-circuit protection, under-voltage lockout,
and thermal protection to prevent device failures. Stability
is maintained by using 1µF capacitors on the output pins.
The MLPD-UT8 1.6mmx1.2mm package and small ceramic
bypass capacitors minimize the required PCB area.
Typical Application Circuit
V IN 1
V IN 1
OUT1
E N 1 SC563
OUT2
V IN 2
EN1
V IN 2
EN2
Rev 2.0
C IN 1
C IN 2
1 µF
1 µF
EN2
GND PAD
GND
OUT 1
OUT 2
C OUT1
C O U T2
1µF
1uF
SC563
Pin Configuration
Ordering Information
Device
Package
SC563LHULTRC(1)(2)
MLPD-UT8 1.6×1.2
SC563LHEVB(3)
Evaluation Board
T O P V IE W
GND
1
OUT1
2
OUT2
GND
8
EN1
7
V IN 1
3
6
V IN 2
4
5
EN2
PAD
MLPD-UT8; 1.6x1.2, 8 LEAD
θJA = 90°C/W
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Lead-free package only. Device is WEEE and RoHS compliant.
(3) See the Voltage Options Table for Manufacture Part Number
Voltage Options and Part Numbering
Device
Ordering
Number
SC563LH SC563LHULTRC
Output
Voltage
Options
OUT1
OUT2
3.3V
1.8V
Marking
Code
Auto-Discharge
LH
Yes
Note: For additional Fixed Output Voltage Options, contact
Semtech marketing.
Marking Information
SC563
Absolute Maximum Ratings
Recommended Operating Conditions
VIN1, VIN2 (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
Ambient Temperature Range (°C). . . . . . . . . -40 < TA < +85
EN1, EN2(V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
VVIN (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 to 5.5
Pin Voltage — All Other Pins (V). . . . . -0.3 to (VVIN + 0.3)
EN1 to GND(V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VIN1
ESD PROTECTION lEVEL (kV). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
EN2 to GND(V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VIN2
(1)
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W) 90
Maximum Junction Temperature (°C). . . . . . . . . . . . . . . +125
Storage Temperature Range (°C). . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . . +260
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:
(1) Tested according to JEDEC standard JESD22-A114-B.
(2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless otherwise noted VVIN = Max[VOUTx + 1.0V or 2.3V], CIN1 = CIN2 = 1μF, COUT1 = COUT2 = 1μF, VEN1 = VEN2 = VVIN, -40 °C < TA =Tj < 125°C.
Typical values are at TA = 25°C. All specifications apply to both LDOs unless otherwise noted.
Parameter
Symbol
Conditions
Min
Input Supply Voltage Range
VIN
Output Voltage Accuracy (1)
ΔVOUTx
IOUTx =1mA,
VIN ≥ Max(VOUTx + 1.0V or 2.3V)
-3
Maximum Output Current
IMAX
Each LDO
300
2.3
IOUTx = 300mA, VINx = 3.0V to 3.6V
IOUTx = 300mA, VINx = 3.0V to 3.6V,
Dropout Voltage(2)
VD
Typ
-40°C < TA < 85°C
IOUTx = 300mA, VINx = 2.3V to 3.0V
IOUTx = 300mA, VINx = 2.3V to 3.0V
-40°C < TA < 85°C
+/- 2
Max
Units
5.5
V
3
%
mA
180
450
mV
180
400
mV
300
540
mV
300
490
mV
1
μA
Shutdown Current
ISD
ENx=0,
0.1
Quiescent Current
IQ
IOUTx = 0mA, VENx = VINx (per LDO)
50
Load Regulation
ΔVLOADx
IOUTx = 1mA to IMAX, -40 °C < TA <=85°C
5
40
mV
Line Regulation
ΔVLINEx
IOUTx = 1mA, -40 °C < TA <=85°C
0.02
0.1
%/V
µA
SC563
Electrical Characteristics (continued)
Parameter
Symbol
Current Limit
ILIMx
Noise
eN
Rload = 50W ,
10Hz < f < 100kHz
100
μVRMS/V
Power Supply Rejection
Ratio
PSRR
IOUTx = 5mA, f = 1kHz,
60
dB
Under Voltage Lockout
VUVLOx
VIN Rising
UVLO Hysteresis
Conditions
Min
Typ
Max
Units
350
550
750
mA
1.95
VUVLO-HYS
Over Temperature Protection
Threshold(3)
TOT
Over Temperature Threshold
Hysteresis
VOT-HYS
Temperature Rising
2.1
2.25
V
100
mV
150
°C
10
°C
Digital Inputs
Logic Input High Threshold
VIH
VIN = 5.5V
1.2
V
Logic Input Low Threshold
VIL
VIN = 2.5V
0.4
V
Logic Input High Current
IIH
VIN = 5.5V
1
μA
Logic Input Low Current
IIL
VIN = 5.5V
1
μA
Notes:
(1) X indicates LDO1 or LDO2.
(2) Dropout voltage is defined as VIN - VOUTx , when VOUTx is 100mV below the value of VOUTx at VIN ≥ Max(VOUTx + 1.0V or 2.3V).
(3) Thermal shutdown does not latch LDOs off. Recovery begins if the temperature drops by the hysteresis level.
SC563
Pin Configurations and Descriptions
SC563
Pin Name Pin Function
1
GND
Ground
2
OUT1
Output for LDO1 --bypass with a 1uF capacitor
3
OUT2
Output for LDO2 --bypass with a 1uF capacitor
4
GND
Ground
5
EN2
Enable for LDO2, internal 5 MW pull low.
6
VIN2
Input supply for LDO2 --bypass with a 1uF capacitor
7
VIN1
Input supply for LDO1-- bypass with a 1uF capacitor
8
EN1
Enable for LDO1, internal 5 MW pull low.
PAD
Heat sink pad, connect to ground on PCB.
SC563
Block Diagram
SC563
V IN 1 7
VREF
OTP
_
Amp
+
B uf
S chm itt
V IN 2 6
VREF
OTP
U V LO
EN2 5
S chm itt
_
Amp
+
OUT1
1
GND
C urrent
Lim it
U V LO
EN1 8
2
3 OUT2
B uf
C urrent
Lim it
4 GND
SC563
Typical Characteristics
Load Regulation (Vin=5.0V, Vout=3.3V)
Load Regulation (Vin=3.6V, Vout=3.3V)
3.40
3.40
Ta=25°C
3.38
Ta=85°C
3.35
Output Voltage (V)
Output Voltage (V)
3.35
3.33
3.30
3.28
3.33
3.30
3.28
3.25
3.25
3.23
3.23
3.20
0.00
0.05
0.10
0.15
0.20
0.25
Ta=25°C
Ta=-40°C
Ta=85°C
3.38
Ta=-40°C
0.30
3.20
0.00
Load Current (A)
0.20
0.25
0.30
Ta=25°C
Ta=-40°C
Ta=85°C
1.88
1.86
Output Voltage (V)
1.83
1.80
1.78
1.75
1.84
1.82
1.80
1.78
1.76
1.74
1.73
1.72
1.70
1.70
0.00
0.05
0.10
0.15
0.20
0.25
0.0
0.30
0.1
0.1
Load Current (A)
0.2
Load Current (A)
0.2
0.3
3.40
3.40
Ta=25°C
Ta=-40°C
Ta=85°C
3.38
3.36
0.3
Line Regulation (Vout=3.3V, Iout=300mA)
Line Regulation (Vout=3.3V, Iout=150mA)
Ta=25°C
Ta=-40°C
Ta=85°C
3.38
3.36
3.34
Output Voltage (V)
Output Voltage (V)
0.15
Load Current (A)
1.90
Ta=25°C
T=-40°C
Ta=85°C
1.85
Output Voltage (V)
0.10
Load Regulation (Vin=4.2V, Vout=1.8V)
Load Regulation (Vin=3.6V, Vout=1.8V)
1.90
1.88
0.05
3.32
3.30
3.28
3.26
3.34
3.32
3.30
3.28
3.26
3.24
3.24
3.22
3.22
3.20
3.20
3.5
4.0
4.5
Input Voltage (V)
5.0
5.5
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
SC563
Typical Characteristics
Line Regulation (Vout=1.8V, Iout=150mA)
1.90
1.90
Ta=25°C
Ta=-40°C
Ta=85°C
1.88
1.86
Ta=25°C
Ta=-40°C
Ta=85°C
1.88
1.86
1.84
Output Voltage (V)
Output Voltage (V)
Line Regulation (Vout=1.8V, Iout=250mA)
1.82
1.80
1.78
1.76
1.84
1.82
1.80
1.78
1.76
1.74
1.74
1.72
1.72
1.70
1.70
2.5
3.0
3.5
4.0
Input Voltage (V)
4.5
5.0
2.5
5.5
350
300
300
250
Vin-Vout (V)
Vin-Vout (V)
350
150
4.0
4.5
5.0
5.5
Dropout Voltage (Vout=3.3V, Iout=150mA)
400
200
3.5
Input Voltage (V)
Dropout Voltage (Vout=3.3V, Iout=50mA)
250
3.0
200
150
100
100
T=-40°C
T=85°C
T=25°C
50
0
0
3.2
3.3
3.4
3.5
T=-40°C
T=85°C
T=25°C
50
3.2
3.6
3.3
3.4
3.5
3.6
Input Voltage (V)
Input Voltage (V)
Dropout Vs Load Current (Vout=3.3V)
Dropout Voltage (Vout=3.3V, Iout=300mA)
250
400
350
200
250
Vin-Vout (mV)
Vin-Vout (V)
300
200
150
150
100
100
50
T=-40°C
T=85°C
T=25°C
50
0
3.2
3.3
3.4
Input Voltage (V)
3.5
3.6
Ta=25°C
Ta=-40°C
Ta=85°C
0
0
50
100
150
200
Load Current (mA)
250
300
SC563
Typical Characteristics
Start Up (Enable) (VOUT=3.3V)
Start Up Via VIN (VOUT=3.3V)
VIN
2V/div
VIN
2V/div
VOUT
2V/div
VOUT
1V/div
IOUT
100mA/div
EN
2V/div
IOUT
100mA/div
VIN = 5V
IOUT = 300mA
100us/div
VIN = 5V
IOUT = 300mA
1ms/div
Start Up (Enable) (VOUT=1.8V)
Start Up Via VIN (VOUT=1.8V)
VIN
2V/div
VIN
2V/div
VOUT
2V/div
VOUT
1V/div
IOUT
100mA/div
EN
2V/div
IOUT
100mA/div
VIN = 5V
IOUT = 300mA
100us/div
VIN = 5V
IOUT = 300mA
Shutdown (VOUT=3.3V)
1ms/div
Shutdown (VOUT=1.8V)
VIN
2V/div
VIN
2V/div
VOUT
1V/div
VOUT
1V/div
IOUT
100mA/div
IOUT
100mA/div
VIN = 5V
IOUT = 300mA
2ms/div
VIN = 5V
IOUT = 300mA
2ms/div
SC563
Typical Waveforms
LDO2=1.8V, 0 to 300mA Load Transient
LDO1=3.3V, 0 to 300mA Load Transient
VOUT
20mV/div
VOUT
20mV/div
IOUT
100mA/div
IOUT
100mA/div
VIN = 3.6V
IOUT = 0A to 300mA
200us/div
200us/div
VIN = 3.6V
IOUT = 0mA to 300mA
LDO2=1.8V, 0 to 300mA Load Transient
LDO1=3.3V, 0 to 300mA Load Transient
VOUT
20mV/div
VOUT
20mV/div
IOUT
100mA/div
IOUT
100mA/div
VIN = 4.2V
IOUT = 0A to 300mA
200us/div
VIN = 4.2V
IOUT = 0A to 300mA
LDO1=3.3V, 0 to 300mA Load Transient
VOUT
20mV/div
200us/div
LDO2=1.8V, 0 to 300mA Load Transient
VOUT
20mV/div
IOUT
100mA/div
IOUT
100mA/div
VIN = 5V
IOUT = 0A to 300mA
200us/div
VIN = 5V
IOUT = 0A to 300mA
200us/div
10
SC563
Typical Waveforms
LDO2=1.8V Noise Spectral Density
1.0E-04
1.0E-04
1.0E-05
1.0E-05
V/Sqrt Hz
V/Sqrt Hz
LDO1=3.3V Noise Spectral Density
1.0E-06
1.0E-06
1.0E-07
1.0E-07
1.0E-08
1.0E+01
1.0E+02
1.0E+03
1.0E+04
1.0E+05
1.0E-08
1.0E+01
1.0E+02
1.0E+03
1.0E+04
1.0E+05
Frequency (Hz)
Frequency (Hz)
VIN = 5.4V, VOUT = 3.3V, Load 50 Ohms
VIN = 5.4V, VOUT = 3.3V, Load 50 Ohms
LDO2=1.8V, PSRR, Iout=100mA
LDO2=1.8V, PSRR, Iout=30mA
100
120
90
100
80
60
PSRR (dB)
PSRR (dB)
70
50
40
30
20
80
60
40
20
10
0
100
1000
10000
Frequency (Hz)
100000
1000000
0
100
1000
10000
Frequency (Hz)
100000
1000000
11
SC563
Applications Information
General Description
The SC563 is a dual output linear regulator with low
dropout voltage, low supply current, and low output
noise. The device provides a simple, low cost solution with
minimal PCB area. It has a miniature package size and
needs four 1µF 0402 size external capacitors for its input
and output.
The dual LDOs are powered from separate input supply
pins. Each LDO provides up to 300mA output current.
1 and the Oscilloscope waveform is shown in the Typical
Characteristics.
E nable
V out
140 -510 µs
Power On and Off Control and Turn-on Delay
The SC563 device has separate enable pins (EN1 and EN2)
that control the LDO outputs respectively. Pulling enable
pin high will enable the device when the Vin is above the
its UVLO level at about 2.4V. Pulling this pin low causes
the device to shutdown where it typically draws 100nA
from the input supply.
When the enable pins are connected to the input voltage
supply, the device turn-on and turn-off has two voltage
thresholds to overcome. At the turn-on event, the enable
pin voltage needs to be greater than the enable threshold
and the Vin voltage needs to be higher than the UVLO.
The higher of the two voltages, which is the UVLO,
determines the turn on time. At turn-off, the first
condition of either enable threshold low or the VIN UVLO
will determine the turn-off event.
After the enable goes high, the IC has a delay time before
the output voltage ramps up. The delay is typically
between 120µs to 510µs. The 510µs is related to the lower
Vin condition.
With 1uF output capacitor (capacitor part number:
GRM155R61A105KE15) at no load conditions, the output
voltage ramp time is typically at 15µs. The device has an
internal discharge MOSFET to discharge the output
voltage at disable, the typical discharge time is at 2ms.
The enable and disable waveforms are illustrated in Figure
15 µs
2m s
Figure 1 — Timing Diagram
The Output Noise
LDO’s noise generally is characterized through noise
spectral density (NSD) and total RMS value in the
frequency band between 10Hz to 100KHz. The noise
spectral density can be measured using a network
analyzer with active probes. The RMS noise value is
obtained from the noise spectral density curve by taking
the square root of the area within the frequency range
from 10Hz to 100kHz.
The normalized output noise for SC563 is at a typical
value of 100µVrms/V. The generalized output voltage
noise can be approximated by: Vrms=Vout*100 µV.
Protection Features
The SC563 provides protection features to ensure that no
damage is incurred in the event of a fault condition. These
functions include:
•
•
•
Under-Voltage Lockout
Over-Temperature Protection
Short-Circuit Protection with peak and foldback current limit
12
SC563
Under-Voltage Lockout
The Under-Voltage Lockout (UVLO) circuit protects the
device from operating in an unknown state if the input
voltage supply is too low.
When either VIN drops below the UVLO threshold, as
defined in the Electrical Characteristics section, the
corresponding LDO is disabled. The LDO is re-enabled
when VIN is increased above the hysteresis level. When
powering up with VIN below the UVLO threshold, the LDO
remains disabled.
Over-Temperature Protection
Over-Temperature protection are separately available on
both LDOs.
An internal Over-Temperature (OT) protection circuit
monitors the internal junction temperature. When the
temperature exceeds the OT threshold as defined in the
Electrical Characteristics section, the OT protection disables the corresponding LDO output. When the temperature drops below its hysteresis value, the LDO output will
resume.
Short-Circuit Protection
Each output has short-circuit protection with peak current
limit and fold back current limit. If the output current
exceeds the peak current limit, the output voltage will
drop and the output current will be limited to its fold back
current limit value. See the waveforms in the typical
operation section. If the short circuit is removed or the
load current reduces to below the fold back current limit,
the LDO output will rise back into regulation.
Component Selection
and stable temperature coefficients. Tantalum capacitors
and Y5V capacitors are not recommended.
Thermal Considerations
Although each of the two LDOs in the SC563 can provide
300mA of output current, the maximum power dissipation
in the device is restricted by the miniature package size.
The graphs in Figures 2 can be used as a guideline to
determine whether the input voltage, output voltages,
output currents, and ambient temperature of the system
result in power dissipation within the operating limits are
met or if further thermal relief is required.
2.5
TJ=150°C
Maximum Power Dissipation (W)
Applications Information (continued)
TJ=125°C
2
TJ=105°C
1.5
1
0.5
0
-50
-35
-20
-5
10
25
40
55
70
85
100
Ambient Temperature (C)
Figure 2 — Maximum PD vs. TA
The following procedure can be followed to determine if
the thermal design of the system is adequate. The junction temperature of the SC563 can be determined in
known operating conditions using the following
equation:
SC563 is designed for PCB savings with small area. The
recommended input and output capacitor is 1μF with
0402 package with part number GRM155R61A105KE15.
TJ = TA +(PD x θJA)
Although there is no maximum value of output capacitor
specified, very large values may increase the rise time of
the output voltages without affecting stability. It is
recommended that the value of output capacitance be
restricted to a maximum of 10μF. Ceramic capacitors of
type X5R or X7R should be used because of their low ESR
TJ = Junction Temperature (°C)
where
TA = Ambient Temperature (°C)
PD = Power Dissipation (W)
θJA = Thermal Resistance Junction to Ambient (°C/W)
13
SC563
Applications Information (continued)
Example
A SC563LH is used to provide outputs of 3.3V, 150mA
from LDO1 and 1.8V, 250mA from LDO2. The input
voltage is 4.2V for LDO1 and 2.5V for LDO2, and the
ambient temperature of the system is 60°C.
PD= 0.15X(4.2 – 3.3) + 0.25X(2.5 – 1.8)
Layout Considerations
The diagram in Figure 3 below illustrates proper layout of
a circuit. The layout considerations are listed below:
•
•
= 0.31W
and
TJ = 60 + (0.31 x 90) = 87.9°C
This calculation shows the junction temperature is 87.9°C
and it is below the maximum junction temperature of
125°C for this power dissipation. This example also demonstrates that with separate input voltages for LDO1 and
LDO2, the total power dissipation can be reduced with
the lower LDO output voltage fed by a lower input
voltage.
•
Attach the thermal pad of the device to a copper
pad with vias connected to the GND plane. This
enables better heat transfer from the device to
the PCB.
Place the input and output capacitors close to
the device for optimal transient response and
device behavior. Extra copper trace length
between the device input and output to the
capacitor soldering pad introduces parasitic
inductance.
Connect all ground connections of the input
and output capacitor directly to the ground
plane whenever possible to minimize ground
potential differences on the PCB. Shown in the
evaluation board layout below, the SC563
thermal pad, ground pins, and the input and
output capacitors are all connected to the
ground plane through vias .
Figure 3 — SC563 Layout Example
14
SC563
Outline Drawing — MLPD-UT8 1.6X1.2
D
A
D IM E N S IO N S
M ILLIM E TE R S
M IN N O M M A X
B
P IN 1
IN D IC A T O R
(LA S E R M A R K )
D IM
A
A1
A2
b
D
D1
E
E1
e
L
N
aaa
bbb
E
A
S E A T IN G
P LA N E
aaa C
C
A1
A2
- 0.60
- 0.05
(0.152)
0.15 0.20 0.25
1.50 1.60 1.70
1.00 1.15 1.25
1.10 1.20 1.30
0.10 0.20 0.30
0.40 B S C
0.25 0.30 0.35
8
0.08
0.10
0.50
0.00
D1
e
1
E1
2
LxN
N
E /2
bxN
bbb
e/2
C A B
D /2
NOTES:
1. C O N TR O LLIN G D IM E N S IO N S A R E IN M ILLIM E TE R S (A N G LE S IN D E G R E E S ).
2. C O P LA N A R ITY A P P LIE S T O TH E E X P O S E D P A D A S W E LL A S T H E T E R M IN A LS .
Land Pattern — MLPD-UT8 1.6X1.2
K
D IM EN SIO N S
(C )
G
H
Z
Y
P/2
X
D IM
C
G
H
K
P
X
Y
Z
M ILLIM E TER S
(1.15)
0.55
0.20
1.25
0.40
0.20
0.60
1.75
P
N O TES:
1. C O N TR O LLIN G D IM EN SIO N S AR E IN M ILLIM E TE R S (AN G LES IN D EG R EES).
2. TH IS LA N D P ATTE R N IS FO R R E FE R E N C E PU R PO SES O N LY.
C O N SU LT Y O U R M A N U FA C TU R IN G G R O U P TO E N S U R E YO U R
C O M PA N Y 'S M AN U FAC TU R IN G G U ID E LIN E S AR E M ET.
3. TH E R M AL V IA S IN TH E LAN D PA TTER N O F TH E EXPO SED PAD
S H A LL B E C O N N EC TE D TO A S YS TE M G R O U N D PLAN E.
FAILU R E TO D O S O M A Y C O M P R O M ISE TH E TH ER M AL AN D /O R
FU N C TIO N A L PE R FO R M A N C E O F TH E D EV IC E.
15
SC563
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