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POWER MANAGEMENT Description
The SC4215 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 2 amps. 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-8EDP package. The output voltage can be set via an external or an internal resistive divider (2.5V) or to 0.8V depending on how the adjust pin is configured.
Very Low Input /Very Low Dropout 2 Amp Regulator With Enable
Features
Input Voltage as low as 1.6V 500mV dropout @ 2A Adjustable output from 0.8V to 3.3V Over current and over temperature protection Enable pin 10A quiescent current in shutdown Low reverse leakage (output to input) Full industrial temperature range Available in SOIC-8EDP package
SC4215
Applications
Telecom/Networking cards Motherboards/Peripheral cards Industrial Applications Wireless infrastructure Set top boxes Medical equipment Notebook computers Battery powered systems
Typical Application Circuits
SC4215
4
VIN ENABLE
3 2 1
VIN EN NC
VO ADJ GND
6 7 8
VO
VO
R1
=
0.8 (R1 + R2) R2
Volts
w
C1
U1
C2 R2
w
w
.D
at
VIN ENABLE
aS
4 3 2 1
SC4215
NC VO 5 6 7 8 4 NC VIN EN NC NC VO ADJ GND 5 6 7 8
NC VIN EN
NC
C1
he
U1
VO = 0.8V
VIN ENABLE
3 2 1
VO = 2.5V
ADJ
GND
et
C2
C1
U1
C2
4U
.c
Revision July 31, 2003
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NC
NC
5
SC4215
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 Vin, EN, Vo, ADJ Absolute Voltage Power Dissipation Thermal Resistance Junction to Ambient SOIC-8EDP(1) Thermal Resistance Junction to Case SOIC-8EDP(1) Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec. ESD Rating (Human Body Model)
Note: (1) 2 square inch of FR-4, double sided, 1 oz. minimum copper weight.
Symbol
Max 6
Units V W C/W C/W C C C C kV
PD JA JC TA TJ TSTG TLEAD V ESD
Internally Limited 36 5.5 -40 to +85 -40 to +150 -65 to +150 300 2
Electrical Characteristics
Unless specified: VEN = VIN. Adjustable Option (VADJ > VTH(ADJ)): VIN = 1.6V to 5.5V and IO = 10A to 2A. Fixed Options (VADJ = GND): VIN = (VO + 0.5V) to 5.5V and IO = 10A to 2A. Values in bold apply over the full operating temperature range.
Parameter VIN Supply Voltage Range Quiescent Current
Symbol
Test Conditions
Min
Typ
Max
Units
VIN IQ VIN = 3.3V VIN = 5.5V, VEN = 0V
1.6 0.75 10
5.5 1.75 50
V mA A
VO Output Voltage(1) (Internal Fixed Voltage) Line Regulation(1) REG(LINE) VIN = (VO + 0.5V), VIN < 3.65V, IOUT = 10mA VIN = (VO + 0.5V), VIN > 3.65V, IOUT = 10mA Load Regulation(1) REG(LOAD) VIN = VO + 0.5V, VIN < 3.65V VIN = VO + 0.5V, VIN > 3.65V Dropout Voltage(1)(2) VD IO = 1A VO VIN = VO + 0.5V, IO = 10mA -1% -2% 0.2 0.5 0.2 0.5 90 VO +1% +2% 0.5 1.0 0.5 1.0 300 400 IO = 1.5A 200 400 500
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V
% % % % mV
mV
SC4215
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless specified: VEN = VIN. Adjustable Option (VADJ > VTH(ADJ)): VIN = 1.6V to 5.5V and IO = 10A to 2A. Fixed Options (VADJ = GND): VIN = (VO + 0.5V) to 5.5V and IO = 10A to 2A. Values in bold apply over the full operating temperature range.
Parameter VO (Cont.) Dropout Voltage(1)(2) Minimum Load Current(3) Current Limit ADJ Reference Voltage(1)
Symbol
Test Conditions
Min
Typ
Max
Units
IO = 2A
300
500 600
mV
IO ICL
VIN = VO + 0.5V 2.2
1 2.6
10 3
A A
VREF
VIN = 2.2V, VADJ = VOUT, IO = 10mA
0.792 0.784
0.8
0.808 0.816
V
Adjust Pin Current(4) Adjust Pin Threshold(5) EN Enable Pin Current Enable Pin Threshold
IADJ VTH(ADJ)
VADJ = VREF 0.05
80 0.16
200 0.40
nA V
IEN VIH VIL
VEN = 0V, VIN = 3.3V VIN = 3.3V VIN = 3.3V 1.6
1.5
10
A V
0.4
Over Temperature Protection High Trip level Hysteresis THI THYST 160 10 C C
Notes: (1) Low duty cycle pulse testing with Kelvin connections required. (2) Defined as the input to output differential at which the output voltage drops to 1% below the value measured at a differential of 0.5V. (3) Required to maintain regulation. Voltage set resistors R1 and R2 are usually utilized to meet this requirement. Adjustable versions only. (4) Guaranteed by design. (5) When VADJ exceeds this threshold, the "Sense Select" switch disconnects the internal feedback chain from the error amplifier and connects VADJ instead.
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SC4215
POWER MANAGEMENT Pin Configuration
Top View
Ordering Information
Part Number SC4215ISTR
(1)(2)
P ackag e SOIC-8EDP
Temp. Range (TA) -40 to +85 OC
S C 4215E V B
Evaluation Board
NC EN VIN NC
(SOIC-8EDP)
GND ADJ VO NC
Note: (1) Available voltage is : 2.5V. Output voltage can be adjusted using external resistors, see Pin Descriptions. (2) Only available in tape and reel packaging. A reel contains 2500 devices for the SOIC-8EDP package.
Pin Descriptions
Pin Name Pin Desciption ADJ When this pin is grounded, an internal resistor divider sets the output voltage to 2.5V. If this pin is 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 (See Application Circuits on page 1):
VO = 0.8 (R1 + R2) R2 Volts
EN GND VIN
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. Reference ground. 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. The pin is the power output of the device. A minimum of 10uF ceramic capacitor should be placed directly at this pin.
VO
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SC4215
POWER MANAGEMENT Block Diagram
1.5uA
8V
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SC4215
POWER MANAGEMENT Typical Characteristics
Region of Instability
Stable Region
Region of Instability
Region of Instability
Stable Region
Region of Instability
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SC4215
POWER MANAGEMENT Applications Information
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 minimum of 4.7F ceramic capacitor is recommended 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, bulk capacitance of about 100uF may be added closely to the input supply pin of the SC4215 to ensure that Vin does not sag, improving load transient response. Output capacitor: A minimum bulk capacitance of 10F, along with a 0.1F ceramic decoupling capacitor is recommended. Increasing the bulk capacitance will improve the overall transient response. The use of multiple lower value ceramic capacitors in parallel 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 comfortably with tantalum output capacitors. Noise immunity: In very electrically noisy environments, it is recommended that 0.1F ceramic capacitors be placed from IN to GND and OUT to GND as close to the device pins as possible. External voltage selection resistors: the use of 1% resistors, and designing for a current flow 10A is recommended to ensure a well regulated output (thus R2 120k). Thermal Considerations The power dissipation in the SC4215 is approximately equal to the product of the output current and the input to output voltage differential:
PD (VIN - VOUT
) * IO
The absolute worst-case dissipation is given by:
PD ( MAX ) = (VIN
( MAX )
- VOUT
( MIN )
)* I
O ( MAX )
+ VIN
( MAX )
* I Q ( MAX
)
For a typical scenario, VIN = 3.3V 5%, VOUT = 2.8V and IO = 1.5A, therefore: VIN(MAX) = 3.465V, VOUT(MIN) = 2.744V and IQ(MAX) = 1.75mA, Thus PD(MAX) = 1.09W. Using this figure, and assuming TA(MAX) = 70C, we can calculate the maximum thermal impedance allowable to maintain TJ 150C:
R TH ( J- A )(MAX ) =
(T
J ( MAX )
- TA (MAX )
PD (MAX )
) = (150 - 70) = 73.4 C / W
109 .
This should be achievable for the SOIC-8EDP package using pcb copper area to aid in conducting the heat away, such as one square inch of copper connected to the exposed die pad of the device. Internal ground/power planes and air flow will also assist in removing heat. For higher ambient temperatures it may be necessary to use additional copper area.
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RIPPLE J1
12345
VO VIN MON 1 VIN NC 3 VIN EN NC U1 GND 8 R2 TBD ADJ 7 VO 10uF,6V,Ceramic 1 C6 GND MON 100uF,16V,Tant. 1 J11 J3 J10 ON 123 ENABLE J2 OFF OFF 3 2 1 GATE DRIVE 1 J12 GATE 47uF,6V,Ceramic 1 GND 1 J13 GND C5 C4 2 6 3 2 1 VO SET NC 1 J7 J8 J5 4 SC4215 5 1 R1 TBD J9 EXTERNAL INTERNAL C1 10uF,6V,Ceramic C2 C3 100uF,16V,Tant. 47uF,6V,Ceramic EN
1
J4
GND
1
J6
U2 Si4410
R4 J14 GND 1
R5
Evaluation Board Schematics
Title SC4215 Evaluation Board Size Date: Document Number SC4215_EVB_1a Friday, February 14, 2003
POWER MANAGEMENT
Rev 1A
Sheet
1
of
1
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SC4215
SC4215
POWER MANAGEMENT Evaluation Board Bill of Materials
Revised: Friday, February 14, 2003 SC4215 Evaluation Board Revision: 1A Bill Of Materials Item
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
February 14,2003 Reference
C5,C1 C4,C2 C3,C6 J1 J2 J3,J6,J14 J4 J5 J7 J8 J9 J10 J11 J12 J13 R1,R2 R3,R5 R4 U1 U2
12:06:33 Part
10uF,6V,Ceramic 47uF,6V,Ceramic 100uF,16V,Tant. RIPPLE ENABLE GND VO EN VIN VIN MON VO SET GATE DRIVE GND MON GATE GND TBD
Quantity
2 2 2 1 1 3 1 1 1 1 1 1 1 1 1 2 2 1 1 1
Manufacturer #
Foot Print
murata 3225 sm/c_1206 EEJL1CD476R 585-558 blkcon.100/vh/tm1sq/w.100/3 5010 5010 5010 bananasocket 5010 blkcon.100/vh/tm1sq/w.100/3 blkcon.100/vh/tm1sq/w.100/3 5010 5010 bananasocket sm/r_1206 alsr-3 alsr-1 SO8 sog.050/8/wg.244/l.225
SC4215 Si4410
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SC4215
POWER MANAGEMENT Evaluation Board Gerber Plots
Board Layout Assembly Top
Board Layout Bottom
Board Layout Top
Board Layout INNER1
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SC4215
POWER MANAGEMENT Outline Drawing - SOIC-8EDP
Land Pattern - SOIC-8EDP
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SC4215
POWER MANAGEMENT Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
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