SC560FULTRT [SEMTECH]
Fixed Positive LDO Regulator, 2 Output, 2.5V1, 1.8V2, BICMOS, 1.50 X 1.50 MM, 0.60 MM HEIGHT, ROHS COMPLIANT, MLPQ-8;
| 型号： | SC560FULTRT |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Fixed Positive LDO Regulator, 2 Output, 2.5V1, 1.8V2, BICMOS, 1.50 X 1.50 MM, 0.60 MM HEIGHT, ROHS COMPLIANT, MLPQ-8 信息通信管理 输出元件 调节器 |
| 文件： | 总18页 (文件大小：347K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC560
Dual Output Low Noise LDO
Linear Regulator
POWER MANAGEMENT
Features
Description
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Input voltage range — 2.5V to 5.5V
Output voltage ranges — 1.2V to 5.0V (each LDO)
Maximum output current — 300mA (both LDOs)
Dropout at 200mA load — 200mV max.
Quiescent supply current — 100μA (both LDOs
enabled)
The SC560 is a family of dual output, ultra-low dropout
linear voltage regulators designed for use in battery
powered wireless applications. The SC560A, SC560B, and
SC560C provide adjustable output voltages that can be
set using two external resistors. Fixed output voltages
are also available (see ordering information for available
combinations). Fixed output devices provide the power-
good monitor, independent enable pins, and a bypass pin
for low-noise operation
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Shutdown current — 100nA (typ)
Output noise < 50μVRMS (SC560A and #xed output
versions)
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PSRR < -65dB at 1kHz (SC560A and #xed output
versions)
All members of the SC560 family require an input voltage
level between 2.5V and 5.5V. Output voltages for the
adjustable versions can vary between 1.2V and 5.0V. Fixed
output voltage options are also chosen from this range.
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Over-temperature protection
Short-circuit protection
Under-voltage lockout
Power good monitor for output A (SC560C and #xed
output versions)
The SC560A provides superior low-noise performance
by using an external bypass capacitor connected to pin
7 to #lter the bandgap reference. The SC560B uses pin 7
as a separate enable pin for the second regulator output
so the two outputs can be controlled independently.
The SC560C uses this pin to provide a PGOOD output
to hold a processor in reset when the voltage on OUTA
is not in regulation. All other versions provide all three
functions with #xed output voltages (no feedback pins
are provided).
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Independent enable/disable for LDOB (SC560B and
# x ed output versions)
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MLPQ-UT8, 1.5mm x 1.5mm x 0.6mm package
Lead-free and halogen-free
Applications
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PDAs and cellular phones
GPS devices
Palmtop computers and handheld instruments
TFT/LCD applications
The device also provides protection circuitry such as
current limiting, under-voltage lockout, and thermal
protection to prevent device failures. Stability is
maintained by using 1µF capacitors on the output pins.
The MLPQ-UT8 package and 0402 ceramic capacitors
minimize the required PCB area.
Wireless handsets
Digital cordless phones and PCS phones
Personal communicators
Wireless LAN
Typical Application Circuit
SC560D
PGO OD
PGO OD
OUTA
VIN
EN
VIN
EN
OUTA
OUTB
BYP
OUTB
ENB
ENB
CIN
2.2µF
CO UTB
1µF
CBYP
22nF
CO UTA
1µF
GND
Rev. 7.1
1
© 2014 Semtech Corporation
SC560
Pin Con!guration
Ordering Information
Device
Package
SC560xULTRT(1)(2)(3)
SC560xEVB(3)
MLPQ-UT8 1.5×1.5
Evaluation Board
8
1
2
3
7
6
5
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Available in lead-free package only. Device is WEEE and RoHS
compliant and halogen-free.
TOP VIEW
(3) The device variant is denoted by the x.
4
MLPQ-UT-8; 1.5x1.5, 8 LEAD
θJA = 157°C/W
Marking Information
Pinout and Voltage Options
Output Voltage
Options
Pin Options
Part
No.
Device
Code
Pin 4
FBA
FBA
FBA
ENB
ENB
ENB
ENB
ENB
ENB
Pin7
BYP
Pin 8
FBB
VLDOA
VLDOB
ADJ
SC560A
SC560B
SC560C
SC560D
SC560E
SC560F
SC560G
SC560H
SC560L
ADJ
ADJ
0A
0B
0C
0D
0K
0L
0U
0S
0Z
ENB
FBB
ADJ
PGOOD
BYP
FBB
ADJ
ADJ
PGOOD
PGOOD
PGOOD
PGOOD
PGOOD
PGOOD
2.8V
2.85V
2.5V
2.8V
3.3V
3.3V
1.8V
2.85V
1.8V
1.5V
3.3V
1.8V
0n
yw
BYP
BYP
BYP
BYP
BYP
0n = Part No. Code
See Pinout and Voltage Options Table for details
yw = Datecode
2
SC560
Absolute Maximum Ratings
Recommended Operating Conditions
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.5
EN, ENB (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3)
PGOOD (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (VIN + 0.3)
Pin Voltage — All Other Pins (V) . . . . . . . . . -0.3 to (VIN + 0.3)
OUTA, OUTB Short Circuit Duration . . . . . . . . Continuous
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ambient Temperature Range (°C) . . . . . . . . . -40 < TA < +85
VIN (V) .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 < VIN < 5.5
VOUTA, VOUTB (V).... . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 < VOUT < 5.0
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W) . . . 157
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150
Storage Temperature Range (°C). . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
Exceeding the above speci#cations may result in permanent damage to the device or device malfunction. Operation outside of the parameters
speci#ed 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 VIN = 3.6V, CIN = 2.2μF, COUTA = COUTB = 1μF, VEN = VENB = VIN, TA = -40 to +85°C. Typical values are at TA = 25°C. All
speci#cations apply to both LDOs unless otherwise noted.
Parameter
Symbol
VIN
Conditions
Min
2.5
Typ
Max
5.5
Units
Input Supply Voltage Range
Output Voltage
V
V
VOUTx
VIN > VOUTx + 0.3V
1.2
5.0
VIN = 2.5V to 5.5V, IOUTx = 0 to 300mA,
Output Voltage Accuracy
Maximum Output Current
ΔVOUTx
-3
3
%
VIN > VOUTx + 0.3V
IMAX
300
mA
mV
mV
μA
IOUTx = 200mA, VOUTx = 2.5V
IOUTx = 200mA, VOUTx = 3.3V to 5.0V
TA = 25°C
180
100
0.1
215
1
Dropout Voltage(1)
VD
Shutdown Current
Quiescent Current
ISD
IQ
IOUTA = IOUTB = 0mA, TA = 25°C
100
μA
Load Regulation
ΔVLOAD
IOUTx = 1mA to IMAX
IOUTx = 1mA
20
mV
Line Regulation
ΔVLINE
VFB
-6
6
mV
V
Feedback Regulation Voltage(2)
Current Limit
0.985
350
1
1.015
850
ILIM
mA
3
SC560
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Units
VIN = 3.7V, IOUTx = 50mA ,
50
μVRMS
10Hz < f < 100kHz, CBYP = 22nF
Noise(3)
eN
VIN = 3.7V, IOUTx = 50mA ,
10Hz < f < 100kHz
300
65
μVRMS
dB
VIN = 3.7V, IOUTx = 50mA, f = 1kHz,
CBYP = 22nF
Power Supply Rejection
Ratio (3)
PSRR
VIN = 3.7V, IOUTx = 50mA, f = 1kHz
40
PGOOD Delay(4)
tDELAY
160
82
200
87
240
92
ms
%
Percentage of nominal output,
VOUTA falling
PGOOD Threshold(4)
VTH-PGOOD
From OFF to 87% VOUTx, IOUTx = 50mA,
CBYP = 22nF(2)
Start-Up Time
tSU
1
ms
μs
Power Up Delay Between LDOA and
LDOB(5)
tDELAY
Delay between VOUTA and VOUTB start-ups
VIN Rising
128
Under Voltage Lockout
UVLO Hysteresis
VUVLO
2.15
2.25
100
2.35
V
VUVLO-HYS
mV
Over Temperature Protection
Threshold
TOT
Temperature Rising
160
20
°C
°C
Over Temperature Hysteresis
Digital Inputs
TOT-HYS
Logic Input High Threshold
Logic Input Low Threshold
Logic Input High Current
Logic Input Low Current
Digital Outputs
VIH
VIL
IIH
VIN = 5.5V
VIN = 2.5V
VIN = 5.5V
VIN = 5.5V
1.25
V
V
0.4
1
μA
μA
IIL
1
PGOOD Output voltage Low
Notes:
VOL
ISINK = 500μA,VIN=3.7V
7
20
mV
(1) Dropout voltage is de#ned as VIN - VOUTx , when VOUTx is 100mV below the value of VOUTx at VIN = VOUTx + 0.5V.
(2) SC560A, SC560B and SC560C only
(3) Except SC560B and #xed output versions
(4) Except SC560A and SC560B
(5) SC560A and SC560C only
4
SC560
Typical Characteristics
Load Regulation — LDOA
Load Regulation — LDOB
VO UTA = 3.3V, VIN = 3.6V
VO UTB = 2.8V, VIN = 3.6V
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
TA=85°C
TA=25°C
TA=85°C
TA=25°C
TA=-40°C
TA=-40°C
0
0
50
100
150
200
250
50
100
150
200
250
Output Current (mA)
Output Current (mA)
Line Regulation — LDOA
Line Regulation — LDOB
VO UTB = 2.8V, IO UTB = 1m A
VO UTA = 3.3V, IO UTA = 1m A
3
2
1.5
1
2.5
2
1.5
1
0.5
TA=85°C
TA=85°C
TA=25°C
0.5
TA=-40°C
0
TA=25°C
0
TA=-40°C
-0.5
-0.5
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
3.3
3.5
3.7
3.9
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
Input Voltage (V)
Input Voltage (V)
Dropout Voltage LDOA
Dropout Voltage LDOB
VO UTA = 3.3V, IO UTA = 200m A
VO UTB = 2.8V, IO UTB = 200m A
400
300
250
200
150
100
350
300
250
200
150
100
50
TA=85°C
TA=85°C
TA=25°C
TA=-40°C
TA=25°C
50
0
TA=-40°C
0
2.95
3
3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4
3.45 3.5 3.55 3.6
2.5
2.55
2.6
2.65
2.7
2.75
2.8
2.85
2.9
2.95
3
3.05
3.1
Input Voltage (V)
Input Voltage (V)
5
SC560
Typical Characteristics (continued)
PSRR vs. Frequency (Both LDOs)
PSRR vs. Frequency (Both LDOs)
VO UT = 2.8V, Io=50m A, CBYP=22nF
0
VO UT = 2.8V, IO = 50m A, no CBYP
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-10
-20
-30
-40
-50
-60
-70
10
100
1000
10000
10
100
1000
10000
Frequency (Hz)
Frequency (Hz)
Output Noise vs. Load Current (Both LDOs)
Output Noise vs. Load Current (Both LDOs)
VO UT = 2.8V, VIN=3.7V, CBYP=22nF
VO UT = 2.8V, VIN = 3.7V, no CBYP
80
70
60
50
40
30
20
10
0
450
400
350
300
250
200
150
100
50
TA=85°C
T=85°C
TA=25°C
TA=-40°C
T=25°C
T=-40°C
0
0
50
100
150
200
250
0
50
100
150
200
250
Output Current (mA)
Output Current (mA)
Load Transient Response
Rising Edge (Both LDOs)
Load Transient Response
Falling Edge (Both LDOs)
VIN = 3.6V, VOUT = 2.8V
VIN = 3.6V, VOUT = 2.8V
IOUT=10mA to
IOUT=10mA to
200ma
200ma
(100mA/div)
(100mA/div))
VOUT
VOUT
(10mV/div)
(10mV/div)
2μs/div
20μs/div
6
SC560
Typical Characteristics (continued)
SC560A PSRR vs. Frequency (Both LDOs)
SC560A Noise Spectrum
VIN = 5V, FB = 10kΩ//0.1μF+5kΩ, by pass=22nF, COUT=1μF
VIN = 5V, FB = 10kΩ//0.1μF+5kΩ, Load=10mA, by pass=22nF, COUT=10μF
90
80
10000
70
60
50
40
30
20
10
0
1000
100
10
1
0.1
1
10
100
1000
10000
0.01
0.1
1
100
1000
10
Frequency (kHz)
Frequency (kHz)
Pin Con!gurations and Descriptions
Pin #
Pin
Name
Pin Function
SC560
Fixed Output
SC560A
SC560B
SC560C
1
2
3
1
2
3
1
2
3
1
OUTB
VIN
Output for LDOB
2
3
Input supply voltage terminal
Output for LDOA
OUTA
Feedback sense pin for LDOA — Connect this pin to an
external resistor divider to set VOUTA
4
5
4
5
4
5
FBA
5
6
GND
Analog and digital ground
Logic input — active HIGH enables both LDOs for the SC560A and
SC560C, or LDOA for all other variants. EN must be active in the
SC560B and the #xed output variants before ENB can be activated.
6
7
6
6
EN
7
4
BYP
ENB
LDO bypass output — Bypass with a 22nF capacitor
Logic input — active HIGH enables LDOB for SC560B and the #xed
voltage variants.
7
Power Good output — monitors the level of LDOA, switches low
when the output drops out of regulation (PGOOD is open drain).
7
8
8
PGOOD
FBB
Feedback sense pin for LDOB — Connect this pin to an external
resistor divider to set VOUTB
8
8
7
SC560
Block Diagrams
SC560A
VIN
VIN
2
5
6
VREF
7
BYP
UVLO
O /T
VIN
3
4
OUTA
FBA
GND
EN
LDOA
LDOB
VIN
Power-
ON
Logic
1
8
OUTB
FBB
SC560B
VIN
VIN
2
5
VREF
UVLO
O /T
VIN
3
4
OUTA
FBA
GND
LDOA
LDOB
6
7
EN
VIN
Power-
ON
Logic
1
8
OUTB
FBB
ENB
8
SC560
Block Diagrams (continued)
SC560C
VIN
VIN
2
5
6
7
VREF
PGO OD
PGO OD
Logic
UVLO
VIN
3
4
OUTA
FBA
GND
EN
O/T
LDOA
LDOB
VIN
Power-
ON
Logic
1
8
OUTB
FBB
SC560 – Fixed Output Versions
VIN
2
VREF
7
8
VIN
BYP
PGO OD
PGO OD
Logic
UVLO
VIN
5
6
4
GND
OUTA
OUTB
O/T
LDOA
LDOB
3
1
EN
VIN
Power-
ON
Logic
ENB
9
SC560
Detailed Application Circuits — SC560A and SC560B
R2
R1
3
4
FBA
2
VIN
VIN
EN
O UTA
O UTA
1Cµ3 F
1Cµ2 F
C4
2.2µF
R6
R5
SC560A
1
7
O UTB
BYP
O UTB
6
5
EN
G ND
FBB
8
C1
22nF
R3
R4
ENB
VIN
4
ENB
2
3
VIN
OUTA
OUTB
OUTA
2C.32µ
F
1
Cµ3
F
SC560B
1
7
OUTB
BYP
6
5
1
Cµ2
F
ENA
ENA
GND
C1
22nF
PGOOD
8
VCC
PGOOD
10
SC560
Detailed Application Circuits — SC560C and SC560 Fixed Output Versions
R2
R1
4
FBA
2
3
VIN
VIN
EN
OUTA
OUTA
2C.42µ
F
1
Cµ3
F
SC560C
1
7
OUTB
OUTB
6
5
1
Cµ2
F
EN
PGOOD
GND
FBB
8
PGOOD
V CC
R4
R5
ENB
VIN
4
ENB
2
3
VIN
OUTA
OUTA
OUTB
2C.42µ
F
1
Cµ3
F
SC560(1)
1
7
OUTB
BYP
6
5
1
Cµ2
F
ENA
GND
ENA
VCC
PGOOD
8
C1
22nF
Note:
(1) SC560D through SC560L
PGOOD
11
SC560
Applications Information
The SC560B and the #xed output variants provide a
separate enable pin for LDOB which allows LDOA and
LDOB to be enabled independently. The EN pin controls
the LDOA output and the ENB provides the same
functionality relative to the LDOB output. The table
shown below lists the e?ect of the polarity of the EN and
ENB signals on the outputs of LDOA and LDOB. Note from
the table that LDOB can only be enabled when LDOA is
already active. Since LDOB can be enabled separately,
there is no timing relationship between the two outputs
at startup.
General Description
TheSC560isafamilyofdualoutputlinearregulatordevices
intended for applications where low dropout voltage, low
supply current, and low output noise are critical. Each
device provides a very simple, low cost solution for two
separate regulated outputs. Very little PCB area is required
due to the miniature package size and the need for only
four external capacitors.
The linear regulators LDOA and LDOB are powered from
a single input supply rail, and each provides 300mA of
output current. The SC560 can provide output voltages
in the range 1.2V to 5.0V. The output voltages for the
SC560A, SC560B and SC560C are set by connecting
external resistor dividers to the feedback pins of each
LDO. All other versions of the SC560 have # x ed output
voltage values shown in the Pinout and Voltage Options
table on page 2. Refer to the previous two pages for
detailed application circuits for each version.
EN
Low
Low
High
High
ENB
Low
High
Low
High
LDOA
O?
LDOB
O?
O?
O?
On
O?
On
On
Power On Control
The SC560C and the #xed output variants have a PGOOD
signal which monitors the output of LDOA and transitions
high 200ms after LDOA has reached 87% of its regulation
point. This can be used to hold a processor in reset when
the output voltage is out of regulation. Note that when
LDOA drops out of regulation and PGOOD is forced low,
LDOB is also disabled until PGOOD is reset.
The SC560A and SC560C devices have a single enable pin
(EN) that controls both LDO outputs. Pulling this pin low
causes the device to enter a low power shutdown mode
where it typically draws 100nA from the input supply.
When EN transitions high, the output of LDOA is enabled.
After a delay of 128μs, the output of LDOB is enabled. In
the SC560C, when the output voltage of LDOA reaches
87% of its regulation point, the delay timer starts and the
PGOOD signal transitions high after a delay of 200ms. The
power up/down sequence is shown in the timing diagram
in Figure 1.
Output Voltage Selection
The output voltage of each LDO for the SC560A, SC560B,
and SC560C version is set independently using external
resistordividers.Figure2illustratestheproperconnection
for LDOA.
OUTA
FBA
E N
87 %
87 %
R1
R2
OU TA
P GOOD
OU TB
200 m s
128 µs
Figure 2 — Output Voltage Feedback Circuit
Figure 1 — Timing Diagram
12
SC560
Applications Information (continued)
The values of the resistors in the voltage divider network
can be calculated using the equation:
Short-Circuit Protection
Each output has short-circuit protection. If the output
current exceeds the current limit, the output voltage will
drop and the output current will be limited until the load
current returns to a speci#ed level. If a short-circuit occurs
on the output of LDOA, the output of LDOB will also be
disabled until the fault is removed and the load current
returns to a speci#ed level.
ꢀ
R1 ꢂ R2 ꢁ
VOUT VREF
R2
where VREF = 1V. The value of R2 should be 100kΩ or
less to ensure noise performance and stability. Values
signi#cantly less than 100kΩ will impact the quiescent
current.
Component Selection
A capacitance of 1μF or larger on each output is
recommended to ensure stability. Ceramic capacitors
of type X5R or X7R should be used because of their
low ESR and stable temperature coe[ cients. It is also
recommended that the input be bypassed with a 2.2μF,
low ESR X5R or X7R capacitor to minimize noise and
improve transient response. Note: Tantalum and Y5V
capacitors are not recommended.
Protection Features
The SC560 family provides the following protection
features to ensure that no damage is incurred in the
event of a fault condition:
• Under-Voltage Lockout
• Over-Temperature Protection
• Short-Circuit Protection
Under-Voltage Lockout
The BYP pin on the SC560D and the #xed output versions
must have a minimum of 22nF connected to ground to
meet all noise-sensitive requirements. Increasing the
capacitance to 100nF will further improve PSRR and
output noise.
The Under-Voltage Lockout (UVLO) circuit protects the
device from operating in an unknown state if the input
voltage supply is too low.
When the VIN drops below the UVLO threshold, the LDOs
are disabled and PGOOD is held low (SC560C and #xed
output variants only). When VIN is increased above the
hysteresis level, the LDOs are re-enabled into their
previous states, provided EN has remained high. When
powering up with VIN below the UVLO threshold, the
LDOs remain disabled and PGOOD is held low (SC560C
and #xed output variants only).
Over-Temperature Protection
An internal Over-Temperature (OT) protection circuit is
providedthatmonitorstheinternaljunctiontemperature.
When the temperature exceeds the OT threshold as
de#ned in the Electrical Characteristics section, the OT
protection disables both LDO outputs and holds the
PGOOD signal low. When the junction temperature drops
below the hysteresis level, the LDOs are re-enabled into
their previous states and PGOOD transitions high after a
200ms delay, provided EN has remained high (SC560C
and #xed output variants only).
13
SC560
Applications Information (continued)
The following procedure can be followed to determine if
the thermal design of the system is adequate.The junction
temperature of the SC560 can be determined in known
operating conditions using the following equation:
Thermal Considerations
Although each of the two LDOs in the SC560 can provide
300mA of output current, the maximum power dissipation
in the device is restricted by the miniature package size.
The graphs in Figure 3 and Figure 4 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.
0.7
TJ = TA +(PD x θJA)
where
TJ = Junction Temperature (°C)
TA = Ambient Temperature (°C)
PD = Power Dissipation (W)
θJA = Thermal Resistance Junction to Ambient (°C/W)
0.6
0.5
Example
0.4
Vo=3.3V
An SC560D is used to provide outputs of 2.8V, 150mA from
LDOA and 1.8V, 200mA from LDOB. The input voltage is
4.2V, and the ambient temperature of the system is 40°C.
Vo=1.5V
0.3
0.2
PD= 0.15(4.2 – 2.8) + 0.2(4.2 – 1.8)
= 0.69W
0.1
______
TA=+25°C, PD(M AX)= 0.8W
- - - - TA=+85
°
C, PD(M AX)= 0.41W
0
4.5
4
Input Voltage (V)
5.5
6
2.5
3
3.5
5
and
Figure 3 — Safe Operating Limit
TJ = 40 + (0.69 x 157) = 148.3°C
1.6
1.4
1.2
1
Figures 3 and 4 show that the junction temperature
would be within the maximum speci#cation of 150°C
for this power dissipation. This means that operation of
the SC560 under these conditions is within the speci#ed
limits and the device would not require further thermal
relief measures.
TJ(M ax)=150°C
0.8
0.6
0.4
TJ(M ax)=125°C
0.2
0
60
80
100
-40
-20
0
20
40
Ambient Temperature (oC)
Figure 4 — Maximum PD vs. TA
14
SC560
Applications Information (continued)
• Place the input, output, and bypass capacitors
Layout Considerations
close to the device for optimal transient
response and device behavior.
While layout for linear devices is generally not as critical as
for a switching application, careful attention to detail will
ensure reliable operation. The diagram below illustrates
proper layout of a circuit using the SC560A. For variants
that don’t require current setting resistors, these devices
can be omitted from the layout.
• Connect all ground connections directly to the
ground plane whenever possible to minimize
ground potential di?erences on the PCB.
• Ensure that the feedback resistors are placed as
close as possible to the feedback pins.
• Attach the part to a large copper footprint, to
enable better heat transfer from the device
on PCBs where there are internal power and
ground planes.
R 4
C 3
R 3
1
C 1
U1
C 4
C 2
R 1
R 2
U1 = SC560A
15
SC560
Outline Drawing — MLPQ-UT8
A
D
B
E
DIM ENSIO NS
INCHES M ILLIM ETERS
DIM
A
A1 .000
A2
b
D
E
e
M IN NOM M AX M IN NOM M AX
-
-
-
-
.018
.024 0.45
.002 0.00
0.60
0.05
(.006)
(0.1524)
PIN 1
INDICATO R
(LASER M ARK)
.006 .008 .010 0.15 0.20 0.25
.059 BSC
.059 BSC
.016 BSC
1.50 BSC
1.50 BSC
0.40 BSC
L
N
0.12
.014 0.16 0.30 0.35 0.40
8
8
aaa
bbb
.004
.004
0.10
0.10
A2
C
A
SEATING
PLANE
aaa
C
A1
LxN
e
2
1
0.20
0.17
0.25
N
bxN
bbb
C
A
B
NOTES:
CONTROLLING DIM ENSIO NS ARE IN M ILLIM ETERS (ANG LES IN DEGREES).
COPLANARITY APPLIES TO THE EXPOSED PAD AS W ELL AS THE TERM INALS.
1.
2.
16
SC560
Land Pattern — MLPQ-UT8
Z
DIM ENSIO NS
INCHES
G
DIM
M ILLIM ETERS
(.057)
.028
.016
.004
.008
.030
.087
(1.45)
0.70
0.40
0.10
0.20
0.75
2.20
C
G
P
R
X
Y
Z
P
(Z)
(G )
2X (C)
X
R
Y
NOTES:
1.
2.
CONTROLLING DIM ENSIO NS ARE IN M ILLIM ETERS (ANG LES IN DEGREES).
THIS LAND PATTERN IS FO R REFERENCE PURPOSES O NLY.
CONSULT YO UR M ANUFACTURING G RO UP TO ENSURE YO UR
COM PANY'S M ANUFACTURING G UIDELINES ARE M ET.
17
SC560
© Semtech 2014
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intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected
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or electrical stress including, but not limited to, exposure to parameters beyond the speci#ed maximum ratings or
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Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
18
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