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SC4211H
Very Low Input /Very Low Dropout
1 Amp Regulator With Enable
POWER MANAGEMENT
Description
Features
The SC4211H is a high performance positive voltage
regulator designed for use in applications requiring very
low Input voltage and very low dropout voltage at up to
1 amperes. It operates with a Vin as low as 1.4V, with
output voltage programmable as low as 0.5V. The
SC4211H features ultra low dropout, ideal for applica-
tions where Vout is very close to Vin. Additionally, the
SC4211H has an enable pin to further reduce power
dissipation while shutdown. The SC4211H provides ex-
cellent regulation over variations in line, load and tem-
perature.
The SC4211H is available in the SOIC-8-EDP (Exposed
Die Pad) package. Depending on how the FB pin is con-
figured, the output voltage can be either externally ad-
justed or fixed to 0.5V.
Typical Application Circuits
u Input Voltage as low as 1.4V
u 400mV dropout @ 1A
u Adjustable output from 0.5V
u Over current and over temperature protection
u Enable pin
u 10µA quiescent current in shutdown
u Full industrial temperature range
u Available in SOIC-8-EDP Lead-free package, fully
WEEE and RoHS compliant
Applications
u Telecom/Networking cards
u Motherboards/Peripheral cards
u Industrial Applications
u Wireless infrastructure
u Set top boxes
u Medical equipment
u Notebook computers
u Battery powered systems
VIN
E NA B LE
S C4211H
45
NC NC
3
VIN
6
VO
VO
2
EN
1
NC
7
FB
8
GND
R1
0.5 (R1 + R2)
VO =
Volts
R2
U1
C1
C2
R2
VIN
ENABLE
SC4211H
45
NC NC
3
VIN
6
VO
2
EN
1
NC
FB 7
8
GND
U1
C1
VO = 0.5V
C2
Rev. 2.1
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SC4211H
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
Symbol Max Units
Vin, EN, Vo, FB to GND
7V
Power Dissipation
PD
Internally Limited
W
Thermal Resistance Junction to Ambient (1)
θJA 36 °C/W
Thermal Resistance Junction to Case (1)
θJC 5.5 °C/W
Operating Ambient Temperature Range
T
-40 to +85
°C
A
Operating Junction Temperature Range
TJ
-40 to +125
°C
Storage Temperature Range
T
-65 to +150
°C
STG
Peak IR Reflow Temperature (10s to 30s)
TP 260 °C
ESD Rating (Human Body Model) (2)
V
ESD
2 kV
Notes:
(1) 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,
(2) Tested according to JEDEC standard JESD22-A114-B.
Electrical Characteristics
Unless specified: VEN = VIN, VFB = VO, VIN = 1.40V to 6.0V, IO = 8mA to 1A.
Values in bold apply over the full operating temperature range.
Parameter
Symbol
Test Conditions
VIN
Supply Voltage Range
Quiescent Current
VO
VIN
IQ
VIN = 3.3V, IO = 0A
VIN = 6.0V, VEN = 0V
Line Regulation(1)
Load Regulation(1)
Dropout Voltage(1)(2)
REG(LINE)
REG(LOAD)
VDO
IO = 10mA
IO = 10mA to 1A
IO = 500mA
Min Typ Max Units
1.40
10
6.0 V
3 mA
50 µA
0.2 0.4 %/V
0.5 1.5 %
100 250 mV
300
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SC4211H
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VEN = VIN, VFB = VO, VIN = 1.40V to 6.0V, IO = 8mA to 1A.
Values in bold apply over the full operating temperature range.
Parameter
Symbol
Test Conditions
VO (Cont.)
Dropout Voltage(1)(2)
VDO
IO = 1A
Minimum Load Current(3)
Current Limit(4)
Feedback
Reference Voltage(1)
IO
ICL
VREF
Feedback Pin Current(4)
EN
IADJ
Enable Pin Current
Enable Pin Threshold
Over Temperature Protection
IEN
VIH
VIL
High Trip level
Hysteresis
THI
THYST
VIN = VO + 0.5V
VIN = 3.3V, VFB = VOUT, IO = 10mA
Full IOUT , and VIN Range
VFB = VREF
VEN = 0V, VIN = 3.3V
VIN = 3.3V
VIN = 3.3V
Min Typ Max Units
200 400
mV
500
8 mA
1.1 1.5 2.0 A
0.495 0.5 0.505 V
0.490
0.510
80 200 nA
1.5 10 µA
1.6 V
0.4
160 °C
10 °C
Notes:
(1)
(2)
(3)
(4)
Low duty cycle pulse testing with Kelvin connections required.
VDO = VIN -VO when VO decreases by 1.5% of its nominal output voltage with VIN = VO +0.8V.
Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this requirement.
Guaranteed by design.
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POWER MANAGEMENT
Pin Configuration
SC4211H
Ordering Information
Part Number
SC4211HSTRT(1)(2)
Package
SOIC-8-EDP
Temp. Range (TJ)
-40 to +125 OC
SC4211HEVB
Evaluation Board
Notes:
(1) Only available in tape and reel packaging. A reel con-
tains 2500 devices.
(2) Lead-free product. This product is fully WEEE and RoHS
compliant.
Pin Descriptions
Pin # Pin Name
2 EN
3 VIN
6 VO
7 FB
Pin Description
Enable Input. Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current to a
fraction of its operating value. The device will be enabled if this pin is left open. Connect to VIN if not
being used.
Input voltage. For regulation at full load, the input to this pin must be between (VO + 0.5V) and 5.5V.
Minimum VIN=1.4V. A large bulk capacitance should be placed closely to this pin to ensure that the
input supply does not sag below 1.4V. Also a minimum of 4.7uF ceramic capacitor should be placed
directly at this pin.
The pin is the power output of the device. A minimum of 10uF capacitor should be placed directly at this
pin.
Output voltage feedback pin. If connected to the VO pin, the output voltage will be set at 0.5V. If external
feedback resistors are used, the output voltage will be (See Application Circuits on page 1):
VO = [0.5 (R1+R2)] / R2 Volts
8 GND
1, 4, 5 NC
THERMAL PAD
Reference ground. The GND pin and the exposed die pad must be connected together at the IC pin.
No connection.
Pad for heatsinking purposes. Connect to ground plane using multiple vias. Not electrically connected
internally.
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POWER MANAGEMENT
Block Diagram
SC4211H
Marking Information
Top View
SC4211H
yyww
xxxxx
yyww = Datecode (Example: 0015)
xxxxx = Semtech Lot No. (Example: 00101)
© 2013 Semtech Corp.
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