SC4215 Datasheet by Semtech Corporation

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POWER MANAGEMENT
1
SC4215
Very Low Input /Very Low Dropout
2 Amp Regulator With Enable
Features
nInput Voltage as low as 1.6V
n500mV dropout @ 2A
nAdjustable output from 0.8V
nOver current and over temperature protection
nEnable pin
n10µA quiescent current in shutdown
nFull industrial temperature range
nAvailable in SOIC-8-EDP Pb-Free product. RoHS/WEEE
and Halogen Free compliant
Applications
nTelecom/Networking cards
nMotherboards/Peripheral cards
nIndustrial applications
nWireless infrastructure
nSet top boxes
nMedical equipment
nNotebook computers
nBattery powered systems
Description
The SC4215 is a high performance positive voltage regula-
tor 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 1.6V, with output
voltage programmable as low as 0.8V. The SC4215 features
ultra low dropout, ideal for applications where Vout is very
close to Vin. Additionally, the SC4215 has an enable pin to
further reduce power dissipation while shut down. The
SC4215 provides excellent regulation over variations in
line, load and temperature.
The SC4215 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 0.8V and 2.5V depending
on how the ADJ pin is confi gured.
Typical Application Circuit
October 8, 2009
7‘ '1 SEMTECH Top View 84 GND 7: ADJ we: v0 5: NC NC|_1 EN: VINl: NC: bmk) Exposed Die Pad On Bonom SOIC-S-EDP HHHH Emu
SC4215
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Pin Confi guration
Marking Information
Ordering Information
Device Package
SC4215ISTRT(1)(2) SOIC-8-EDP
SC4215IEVB Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 2,500 devices.
(2) Available in Pb-Free product only. RoHS/WEEE and Halogen Free
compliant.
yyww = Date code (Example: 1152)
SC4215I
xxxxxxx
xxxxxxx = Semtech Lot No. (Example: A0E9010)
Top Mark
nnnnnnn= Part Number (Example: SC4215I)
yyww
7‘ '1 SEMTECH
SC4215
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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, ADJ to GND (V) . . . . . . . . . . . . . . . . . -0.3 to +7.0
Power Dissipation . . . . . . . . . . . . . . . . . . . . . Internally Limited
ESD Protection Level(1) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Recommended Operating Conditions
VIN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 < VIN < 5.5
Ambient Temperature Range (°C) . . . . . . . . . -40 < TA < +85
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, VIN = 1.6V to 5.5V, 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 0.75 1.75 mA
VIN = 5.5V, VEN =0V 10 50 µA
VO
Output Voltage(1)
VO
VIN= VO + 0.5V, IO = 10mA -2%
VO
+2%
V
(Fixed Voltage, VADJ = 0) 1.60V ≤ VIN ≤ 5.5V, 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 1.0 %
Electrical Characteristics
7‘ '1 SEMTECH
SC4215
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Parameter Symbol Conditions Min Typ Max Units
Dropout Voltage(1)(2) VDO
IO =1A
90 300
mV
400
IO =1.5A
200 400
500
IO = 2A
VIN =VO+ 0.5V 300 500
VIN =VO+ 0.6V 600
Minimum Load Current(3)(4) IOVIN =VO+ 0.5V 1 10 µA
Current Limit(4) ICL 2.2 34.5 A
ADJ
Reference Voltage(1) VREF VIN = 3.3V, VFB = VOUT , IO =10mA
0.792
0.8
0.808
V
0.784 0.816
Adjust Pin Current(4) IADJ VADJ = VREF 80 200 nA
Adjust Pin Threshold(5) VTH(ADJ) 0.05 0.16 0.40 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. Adjustable mode only.
(4) Guaranteed by design.
(5) When VADJ exceeds this threshold, the “Sense Select switch disconnects the internal feedback chain from the error amplifi er and connects VADJ
instead.
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SC4215
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Typical Characteristics
7‘ '1 SEMTECH VIN EN RSENSE ‘WV Therm al Shutdown + __/' Reverse Vo‘tage Shutdown ) ADJ ) GND
SC4215
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Pin Descriptions
Pin # Pin Name Pin Function
2 EN
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
5.5V. Minimum VIN = 1.6V. A large bulk capacitance should be placed closely to this pin to ensure
that the input supply does not sag below 1.6V. Also a minimum of 4.7uF ceramic capacitor should
be placed directly at this pin.
6 VO The pin is the power output of the device. A minimum of 10uF capacitor should be placed directly
at this pin.
7 ADJ
When this pin is grounded, an internal resistor divider sets the output voltage to 2.5V. If connected
to the Vo pin, the output voltage will be set at 0.8V. 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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SC4215
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Applications Information (continued)
Introduction
The SC4215 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 SC4215 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 SC4215 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 ADJ pin to
GND, an internal resistor divider will regulate the output
voltage to 2.5V.
If the ADJ pin is connected directly to the VO pin, the
output voltage will be regulated to the 0.8V 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.
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 SC4215 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
=
(
)
OINOD
VVIP
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SC4215
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Outline Drawing — SOIC-8-EDP-3
7‘ '1 SEMTECH 0 0.36m!“ THERMAL VIA# SOLDER MASK (a) f DIMENSIONS DIM INCHES MILLIMETERS c (.205) (5.20) D 134 3 A0 E .201 5.10 F .101 2.56 G .110 3.00 P .050 1.27 x 024 0 60 Y 037 2 20 z .291 7.40 NOTES: 1 CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES) 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY‘S MANUFACTURING GUIDELINES ARE MET REFERENCE IPCFSMF732A. RLP NO. 300A. THERMAL WAS IN THE LAND PATTERN OF THE EXPOSED PAD SHALL BE CONNECTED TOASYSTEM GROUND PLANE FAILURE TO DO 50 MAY COMFROMISE THE THERMAL AND/OR FUNCTIONAL PERFORMANCE OF THE DEVICE
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
SC4215
9
Land Pattern — SOIC-8-EDP-3

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