SC4212BEVB [SEMTECH]
Very Low Input /Very Low Dropout 1 Amp Regulator;
| 型号： | SC4212BEVB |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Very Low Input /Very Low Dropout 1 Amp Regulator |
| 文件： | 总11页 (文件大小：839K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC4212B
Very Low Input /Very Low Dropout
1 Amp Regulator
POWER MANAGEMENT
Features
Description
Input Voltage Range from 1.6V to 6.0V
150mV Maximum Dropout @ 1A
Adjustable Output from 0.5V with 1ꢀ Accuracy
12µA Quiescent Current in Shutdown
Enable Input
The SC4212B is a high performance linear voltage regula-
tor designed for applications requiring very low dropout
voltage at load currents up to 1 Ampere. It operates with
VIN as low as 1.6V and up to 6V, making it useful for a wide
range of different applications and rails. The output
voltage is programmable down to 0.5V, set via an external
resistor divider, or to a fixed setting of 0.5V depending
upon how the FB pin is configured.
250µs Internal Soft-Start
Over Current and Over Temperature Protection
Reverse Blocking from Output to Input
Full Industrial Temperature Range
3mm x 3mm x 1mm MLPD-8 Package
Fully WEEE and RoHS Compliant
The SC4212B has an enable pin to further reduce power
dissipation while shut down. Protection features include
over current protection, over temperature protection and
reverse blocking from output to input. The SC4212B is
available in a 3mm x 3mm MLPD-8 package.
Applications
Telecom and Networking Cards
Motherboards and Peripheral Cards
Industrial Applications
Wireless Infrastructure
Medical Equipment
Typical Application Circuit
SC 4212B
0.5(R1+R2)
R2
SC4212B
VO =
VO=0.5V
VO
VO
VIN
EN
VIN
EN
VO
FB
VIN
EN
VIN
EN
VO
FB
R1
C3
GN D
GN D
C2
C2
C1
C1
R2
R2
* C3 is a placeholder
Rev. 2.0
1
© 2015 Semtech Corporation
SC4212B
Pin Configuration
Ordering Information
Device
Package
TOP VIEW
SC4212BMLTRC(1)(2)
SC4212BEVB
3mm x 3mm x 1mm MLPD-8
Evaluation Board
8
7
6
NC
EN
1
2
3
GND
FB
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.
VIN
VO
5
NC
4
NC
3mm x 3mm x 1mm MLPD-8
θJA = 36.3°C/W
Marking Information
212B
yyww
xxxx
yyww = Datecode ( Example : 1352 )
xxxx = Semtech Lot No. ( Example : 2932 )
2
SC4212B
Absolute Maximum Ratings
Recommended Operating Conditions
VIN, VO to GND (V) . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 6.5
EN to GND (V). . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN + 0.3
FB to GND (V). . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN + 0.3
Power Dissipation. . . . . . . . . . . . . . . . . . . . . Internally Limited
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 ≤ VIN ≤ 6.0
Junction Temperature Range (°C). . . . . . . . . -40≤TJ ≤+125
Output Current Range . . . . . . . . . . . . . . . . . . . 50µA ≤ IO ≤1A
Thermal Information
ESD Protection Level HBM(1) (kV) . . . . . . . . . . . . . . . . . . .
ESD Protection Level CDM(2) (kV) . . . . . . . . . . . . . . . . . . .
4
1
Thermal Resistance, Junction to Ambient (3) (°C/W) . . 36.3
Thermal Resistance, Junction to Case (°C/W). . . . . . . . 3.77
Storage Temperature (°C) . . . . . . . . . . . . . . . . . . . -65to+150
Peak IR Reflow Temperature (10s to 30s). . . . . . . . . . +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 standard ANSI/ESDA/JEDEC JS-001-2012.
(2) Tested according to standard JESD-C101E.
(3) Calculated from package in still air, mounted to 3”x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Electrical Characteristics
Unless noted otherwise TJ = 25° C for typical, -40° C < TJ < 125° C for min and max. VEN = VIN, VFB = VO, VIN = 1.6V to 6.0V, CIN=10µF, COUT=10µF.
Parameter
VIN
Symbol
Conditions
Min
Typ
Max
Units
VIN operating range(1)
1.6
6.0
680
2
V
VIN = 3.3V, IO = 0A
IO = 1A
325
12
µA
mA
µA
Quiescent current
IQ
VEN =0V
50
Feedback
Feedback voltage(2)
Feedback pin current
VO
VFB
IFB
IO = 10mA to 1A
VFB = VOUT
0.495
0.500
80
0.505
200
V
nA
Line regulation(2)
Load regulation(2)
IO = 10mA
0.01
0.21
0.2
1.0
ꢀ/V
ꢀ
IO = 10mA to 1A
3
SC4212B
Electrical Characteristics (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
86
Units
mV
1.6V ≤ VIN < 2.2V
IO =0.5A
IO = 1A
2.2V ≤ VIN ≤ 6.0V
1.6V ≤ VIN < 2.2V
2.2V ≤ VIN ≤ 6.0V
75
Dropout voltage(3)
VDO
175
150
2.6
Current limit
ICL
1.2
1.2
A
EN
VEN = 0V, VIN = 1.6V to 6.0V
1.5
80
10
µA
nA
Enable pin current
IEN
VEN = VIN
200
VIH
VIL
Enable pin threshold
VIN = 1.6V to 6.0V
V
0.4
Over Temperature Protection
High trip level
THI
150
10
OC
OC
Hysteresis
THYST
Notes:
(1) Minimum VIN = VOUT + VDO or 1.6V, whichever is greater.
(2) Low duty cycle pulse testing with Kelvin connections required.
(3) VDO = VIN - VO when VFB = GND.
4
SC4212B
Pin Descriptions
Pin #
Pin Name
Pin Function
1, 4, 5
NC
No connection. Do not connect to any node electrically.
Enable input. Driving this pin high turns on the regulator. Driving this pin low shuts off the regula-
tor. If not driven from a control circuit, tie this pin directly to the VIN pin, or via a resistor up to
400kΩ.
2
EN
Input supply pin. A large bulk capacitance should be placed close to this pin to ensure that the
input supply does not sag below the minimum VIN.
3
6
7
8
VIN
VO
FB
Regulator output pin. Refer to the Applications Information section for output capacitor selection.
Input of the error amplifier. This pin is used to set the output voltage (See typical Application
Circuits on page 1).
GND
Ground pin.
The exposed pad enhances thermal performance and is not electrically connected inside the pack-
age. It is recommended to connect the exposed pad to the ground plane using multiple vias.
THERMAL PAD
Block Diagram
R everse Polarity
Protection C ircuitry
VIN
VO
Over-current and
therm al shutdow n
C ircuitry
FB
Enable
C ircuitry
EN
VREF
C ircuitry
G ND
5
SC4212B
Typical Characteristics
Unless noted otherwise CIN=10µF/10V X7R 0805, COUT=10µF/10V X7R 0805.
Dropout Voltage at Vin = 1.6V
Dropout Voltage at Vin = 2.2V
1A
1A
0.5A
0.5A
Current Limit Threshold
Dropout Voltage at Vin = 6.0V
1A
0.5A
Input Under-voltage Lockout Threshold
Shutdown Current
Vin rising threshold
Vin = 6.0V
Vin = 3.3V
Vin = 1.6V
Vin falling threshold
6
SC4212B
Typical Characteristics (Continued)
Unless noted otherwise CIN=10µF/10V X7R 0805, COUT=10µF/10V X7R 0805.
Quiescent Current
Output Rise Time
Io = 0A
ENABLE Falling Threshold
ENABLE Rising Threshold
Power Supply Ripple Rejection
Output Spectral Noise Density
Vin = 1.8V, Vo = 0.5V
RL = 50Ω
7
SC4212B
Applications Information
Over-Current and Thermal Shutdown
Introduction
The over-current protection and thermal shutdown func-
tions protect the regulator against damage due to exces-
sive power dissipation. The SC4212B is designed to current
limit when the output current reaches 1.6A (typical). When
the load exceeds 1.6A, the output voltage is reduced to
maintain a constant current limit.
The SC4212B is intended for applications where high
current capability and very low dropout voltage are
required. It provides a very simple, low cost solution that
uses very little PCB area. Additional features include an
enable pin to allow for a very low power consumption in
standby mode, and a fully adjustable output.
The thermal shutdown function limits the junction tem-
perature to a maximum of 150 C (typical). Thermal shut-
VO Setting: VO = VREF
O
down turns off the regulator as the junction temperature
By connecting the FB pin directly to the VO pin, the output
voltage will be regulated to the 0.5V internal reference. In
this configuration, R2 should be 10kΩ.
O
reaches the high trip level of 150 C. When the junction
O
temperature drops below 140 C (typical), the regulator is
turned on once again.
VO Setting with External Resistors
Thermal Considerations
The use of 1ꢀ resistors, and designing for a current flow ≥
50µA is recommended to ensure a well regulated output
(thus R2 ≤ 10kΩ). R1 can then be calculated from
R1 = R2 (VO-VREF)/VREF
The power dissipation in the SC4212B is given by the fol-
lowing equation:
PD ≈ IO(VIN - VO)
The allowable power dissipation will be dependant upon
the thermal impedance achieved in the application. The
derating curve below is valid for the thermal impedance
specified in the Thermal Information section on page 3.
Enable
Pulling this pin below 0.4V turns the regulator off, reduc-
ing the quiescent current to a fraction of its operating
value. Driving this pin high enables the regulator. A pull
up resistor ≤ 400kΩ should be connected from this pin to
the VIN pin in applications where the Enable pin is not
driven from a control circuit.
Input Capacitor
A 10µF X5R or X7R ceramic capacitor, along with a 0.1µF
ceramic decoupling capacitor is recommended to be
placed directly next to the VIN pin. This allows for the
device being some distance from the input source, reduc-
ing the input droop due to load transients and improving
load transient response. Additional capacitance may be
needed if large step, fast di/dt load transients are required
or the LDO is located far away from the input source.
Figure 1. Power Derating Curve
Output Capacitor
A 10µF or larger X5R or X7R ceramic capacitor, along with
a 0.1µF ceramic decoupling capacitor is recommended.
8
SC4212B
Outline Drawing — 3mm x 3mm MLPD-8
9
SC4212B
Land Pattern — 3mm x 3mm MLPD-8
K
DIM ENSIO NS
Y
DIM
INCHES
M ILLIM ETERS
(.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
G
H
K
P
X
Y
Z
H
X
(C)
G
Z
P
NO TES:
CO NTRO LLING DIM ENSIO NS ARE IN M ILLIM ETERS (ANG LES IN DEG REES).
1.
2. THIS LAND PATTERN IS FO R REFERENCE PURPO SES O NLY.
CO NSULT YO UR M ANUFACTURING G RO UP TO ENSURE YO UR
CO M PANY'S M ANUFACTURING G UIDELINES ARE M ET.
3.
THERM AL VIAS IN THE LAND PATTERN O F THE EXPO SED PAD
SHALL BE CO NNECTED TO A SYSTEM G RO UND PLANE.
FAILURE TO DO SO M AY CO M PRO M ISE THE THERM AL AND/O R
FUNCTIO NAL PERFO RM ANCE O F THE DEVICE.
10
SC4212B
© Semtech 2015
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright
owner. The information presented in this document does not form part of any quotation or contract, is believed to be
accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any conse-
quence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellec-
tual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation
resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress
including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the
specified range.
SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-
SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS
IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer
purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold
Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages
and attorney fees which could arise.
Notice: All referenced brands, product names, service names and trademarks are the property of their respective
owners.
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
11
相关型号：
©2020 ICPDF网 联系我们和版权申明