SC4215A Datasheet by Semtech Corporation

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© 2011 Semtech Corporation
POWER MANAGEMENT
1
SC4215A
Very Low Input /Very Low Dropout
2 Amp Regulator With Enable
Features
Input Voltage as low as 1.4V
400mV dropout @ 2A
Adjustable output from 0.5V to 3.8V
Over current and over temperature protection
Enable pin
10μA quiescent current in shutdown
Full industrial temperature range
Available in SOIC-8-EDP Lead-free package, fully WEEE
and RoHS compliant
Applications
Telecom/Networking cards
Motherboards/Peripheral cards
Industrial applications
Wireless infrastructure
Set top boxes
Medical equipment
Notebook computers
Battery powered systems
Description
The SC4215A is a high performance positive voltage regu-
lator designed for use in applications requiring very low
input voltage and very low dropout voltage at up to 2
amperes. It operates with a Vin as low as 1.4V, with output
voltage programmable as low as 0.5V. The SC4215A fea-
tures ultra low dropout, ideal for applications where Vout
is very close to Vin. Additionally, the SC4215A has an
enable pin to further reduce power dissipation while shut-
down. The SC4215A provides excellent regulation over
variations in line, load and temperature.
The SC4215A is available in the SOIC-8-EDP (Exposed Die
Pad) package. The output voltage can be set via an exter-
nal divider or to fi xed settings of 0.5V and 1.2V depending
on how the FB pin is confi gured.
Typical Application Circuit
Revision 10.0
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SC4215A
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Pin Confi guration
Marking Information
Ordering Information
Device Package
SC4215ASTRT(1)(2) SOIC-8-EDP
SC4215AEVB Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 2,500 devices.
(2) Available in lead-free package only. Device is WEEE and RoHS
compliant.
Va '1 SEMTECH
SC4215A
3
Exceeding the above specifi cations may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specifi 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”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Absolute Maximum Ratings
VIN, EN, VO, FB to GND (V) . . . . . . . . . . . . . . . . . . -0.3 to +7.0
Power Dissipation . . . . . . . . . . . . . . . . . . . . . Internally Limited
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Recommended Operating Conditions
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 < VIN < 6.0
Ambient Temperature Range (°C) . . . . . . . . . -40 < TA < +105
Junction Temperature Range (°C) . . . . . . . . . -40 < TJ < +125
Maximum Output Current (A) . . . . . . . . . . . . . . . . . . . . . . . . .2
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W) . . . .
36
Thermal Resistance, Junction to Case(2) (°C/W) . . . . . . . . 5.5
Maximum Junction Temperature (°C) . . . . . . . . . . . . . .+150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Refl ow Temperature (10s to 30s) (°C) . . . . . . +260
Unless specifi ed: VEN = VIN, VFB = VO, VIN = 1.40V to 6.0V, IO = 10μA to 2A, TA = 25° C.
Values in bold apply over the full operating temperature range.
Parameter Symbol Conditions Min Typ Max Units
VIN
Quiescent Current IQ
VIN = 3.3V, IO = 0A 3mA
VIN = 6.0V, VEN =0V 10 50 μA
VO
Output Voltage(1)
(Fixed Voltage, VFB = 0) VO
VIN= VO + 0.5V, IO = 10mA
-2%
VO
+2%
VVIN = 1.8V, IO = 0.8A, 0°C ≤ TJ = TA ≤85°C
1.40V ≤ VIN ≤ 6.0V, IO = 10mA -3% +3%
Line Regulation(1) REG (LINE) IO =10mA 0.2 0.4 %/V
Load Regulation(1) REG(LOAD) IO =10mA to 2A 0.5 1.5 %
Electrical Characteristics
Va '1 SEMTECH
SC4215A
4
Parameter Symbol Conditions Min Typ Max Units
Dropout Voltage(1)(2) VDO
IO =1A
1.4V ≤ VIN < 1.6V 90 400
mV
1.6V ≤ VIN ≤ 6.0V 200
IO =1.5A
1.4V ≤ VIN < 1.6V 200 500
1.6V ≤ VIN ≤ 6.0V 300
IO = 2A
1.4V ≤ VIN < 1.6V 300 600
1.6V ≤ VIN ≤ 6.0V 400
Minimum Load Current(3)(4) IO10 μA
Current Limit(4) ICL 2.1 34.4 A
Feedback
Reference Voltage(1) VREF VIN = 3.3V, VFB = VOUT , IO =10mA
0.495
0.5
0.505
V
0.490 0.510
Feedback Pin Current(4) IADJ VFB = VREF 80 200 nA
Feedback Pin Threshold(5) VTH(FB) 0.05 0.10 0.15 V
EN
Enable Pin Current IEN VEN = 0V, VIN =3.3V 1.5 10 μA
Enable Pin Threshold
VIH
VIN=3.3V
1.6
V
VIL 0.4
Over Temperature Protection
High Trip Level THI 160 OC
Hysteresis THYST 10 OC
Electrical Characteristics (continued)
Notes:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) VDO = VIN -VO when VO decreases by 1.5% of its nominal output voltage.
(3) Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this requirement.
(4) Guaranteed by design.
(5) When VFB exceeds this threshold, the “Sense Select” switch disconnects the internal feedback chain from the error amplifi er and connects VFB
instead.
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SC4215A
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Typical Characteristics
7‘ '1 SEMTECH VIN EN RSENSE ‘\N\ Therma‘ Shutdawn Eff Reverse Vouage Shutdown FB '— GND
SC4215A
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Pin Descriptions
Pin # Pin Name Pin Function
2EN
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.
3 VIN
Input voltage. For regulation at full load, the input to this pin must be between (VO+ 0.5V) and
6.0V. 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.
6VO
The pin is the power output of the device. A minimum of 10uF capacitor should be placed directly
at this pin.
7FB
When this pin is grounded, an internal resistor divider sets the output voltage to 1.2V. 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 determined by the resistor ratio (See Application Circuits on page 1):
8 GND Reference ground. The GND pin and the exposed die pad must be connected together at the IC
pin.
1, 4, 5 NC No Connection.
THERMAL PAD Pad for heatsinking purposes. Connect to ground plane using multiple vias.
Block Diagram
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SC4215A
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Applications Information (continued)
Introduction
The SC4215A 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 real estate. Additional features include
an enable pin to allow for a very low power consumption
standby mode, and a fully adjustable output.
Component Selection
Input capacitor: A large bulk capacitance ≥ 10μF/A
(output load) should be closely placed to the input supply
pin of the SC4215A to ensure that Vin does not sag below
1.4V. Also a minimum of 4.7μF ceramic capacitor is recom-
mended to be placed directly next to the Vin pin. 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. Additional capacitance may be added if required
by the application.
Output capacitor: A minimum bulk capacitance of ≥
10μF/A (output load), along with a 0.1μF ceramic decou-
pling capacitor is recommended. Increasing the bulk
capacitance will improve the overall transient response.
The use of multiple lower value ceramic capacitors in par-
allel to achieve the desired bulk capacitance will not cause
stability issues. Although designed for use with ceramic
output capacitors, the SC4215A is extremely tolerant of
output capacitor ESR values and thus will also work com-
fortably with tantalum output capacitors.
Noise immunity: In very electrically noisy environments,
it is recommended that 0.1μF ceramic capacitors be placed
from IN to GND and OUT to GND as close to the device
pins as possible.
Internal voltage selection: By connecting the FB pin to
GND, an internal resistor divider will regulate the output
voltage to 1.2V.
If the FB pin is connected directly to the VO pin, the output
voltage will be regulated to the 0.5V internal reference.
External voltage selection resistors: The use of 1%
resistors, and designing for a current fl ow ≥ 10μA is rec-
ommended to ensure a well regulated output (thus R2
≤50kΩ). A suitable value for R2 can be chosen in the range
of 1kΩ to 50kΩ. R1 can then be calculated from.
The highest output voltage achievable with external resis-
tors is 4V. An attempt to set a higher voltage may result in
VFB(TH) not being exceeded which will force the device into
the 1.2V output mode.
The SC4215H does not have this limitation and is recom-
mended for applications requiring VO above 3.8V.
Enable: Pulling this pin below 0.4V turns the regulator off ,
reducing the quiescent current to a fraction of its operat-
ing value. A pull up resistor up to 400kOhms should be
connected from this pin to the VIN pin in applications
where supply voltages of Vin < 1.9V are required. For
applications with higher voltages than 1.9V, EN pin could
be left open or connected to VIN.
Thermal Considerations
The power dissipation in the SC4215A is given by:
The allowable power dissipation will be dependant on the
thermal impedance achieved in the application. The derat-
ing curve below is valid for the thermal impedance speci-
fi ed in the Thermal Information section on page 3.
()
REF
REFO
21
V
VV
RR
=
()
REF
REFO
21
V
VV
RR
=
()
OINOD
VVIP
()
OINOD
VVIP
7‘ '1 SEMTECH DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .053 - .069 1.35 - 1.75 .000 - .005 0.00 - 0.13 .049 - .005 1.25 - 1.05 .012 - .020 0.31 - 0.51 .007 - .010 0.17 - 0.25 .159 .193 .197 4.00 4.90 5.00 .150 .154 .157 3.00 3.90 4.00 .ZSGESG .OOESC 050550 27550 .116 .120 .130 2.95 3.05 3.30 .005 .005 .099 2.15 2.41 2.51 .010 - .020 0.25 - 0.50 .016 .025 .041 0.40 0.72 I04 (.041) (1.05) I 5 0'I-Is‘0‘I-I0' .004 0.10 .010 0.25 .003 0.20 E Z Q0000 2XN/21IPs +1 E355? SEATING PLANE H ggggzgrxxmwmguncgg) EXPOSED PAD NOTES: 1. CONTROLLING DIMENSIONSARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS AND .10 BE DETERMINEDAT DATUM PLANE E 5. DIMENSIONS 'E1'AND 'D' Do NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE EURRS. 4. REFERENCE JEDEc STD M5012, VARIATION BA,
SC4215A
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Outline Drawing — SOIC-8-EDP-2
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SC4215A
9
Land Pattern — SOIC-8-EDP-2
7‘ '1 SEMTECH
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
Contact Information
SC4215A
10
© Semtech 2011
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including, but not limited to, exposure to parameters beyond the specifi ed maximum ratings or operation outside the
specifi ed range.
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