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Step-Down Regulator. SC284 Datasheet

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Step-Down Regulator. SC284 Datasheet







SC284 Regulator. Datasheet pdf. Equivalent




SC284 Regulator. Datasheet pdf. Equivalent





Part

SC284

Description

1.8A Synchronous Step-Down Regulator

Manufacture

Semtech

Datasheet
Download SC284 Datasheet


Semtech SC284

SC284; www.DataSheet.co.kr SC284 POWER MANAGEM ENT Features                   Dual Channel 2.5MHz, 1. 8A Synchronous Step-Down Regulator Desc ription The SC284 is a dual channel 1.8 A synchronous stepdown regulator design ed to operate with an input voltage ran ge of 2.9 to 5.5 Volts. Each channel of fers fifteen pre-determined output voltages via four contr.


Semtech SC284

ol pins programmable from 0.8 to 3.3 Vol ts. The control pins allow for on-the-f ly voltage changes, enabling system des igners to implement dynamic power savin gs. The SC284 is also capable of adjust ing the output voltage via an external resistor divider. The device operates w ith a fixed 2.5MHz oscillator frequency , allowing the use of small surface mou nt external compon.


Semtech SC284

ents. Connecting CTL0 — CTL3 to logic low forces the device into shutdown mod e reducing the supply current to less t han 1µA. Connecting any of the control pins to logic high enables the convert er and sets the output voltage accordin g to Table 1. Other features include un dervoltage lockout, soft-start to limit inrush current, and over-temperature p rotection. The SC284 .



Part

SC284

Description

1.8A Synchronous Step-Down Regulator

Manufacture

Semtech

Datasheet
Download SC284 Datasheet




 SC284
SC284www.DataSheet.co.kr
POWER MANAGEMENT
Features
Dual Channel 2.5MHz, 1.8A
Synchronous Step-Down Regulator
Description
VIN Range — 2.9 – 5.5V
VOUT Selectable — 0.8 - 3.3V
Up to 1.8A Output Current for Each Channel
Ultra-Small Footprint, <1mm Height Solution
Switching Frequency — 2.5MHz
Efficiency Up to 94%
Excellent Light Load Efficiency
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
100% Duty-Cycle Low Dropout Operation
Shutdown Current — <1µA
Internal Soft Start
Input Under-Voltage Lockout
Output Over-Voltage, Current Limit Protection
Over-Temperature Protection
Adjustable Output Voltage
Package — 3 x 3 x 0.6(mm) UT20
Temperature Range — -40 to +85°C
Lead-free, halogen-free, and RoHS/WEEE compliant
Applications
Desktop Computing
Set-Top Box
LCD TV
Network Cards
Printer
The SC284 is a dual channel 1.8A synchronous step-
down regulator designed to operate with an input
voltage range of 2.9 to 5.5 Volts. Each channel offers
fifteen pre-determined output voltages via four control
pins programmable from 0.8 to 3.3 Volts. The control pins
allow for on-the-fly voltage changes, enabling system
designers to implement dynamic power savings. The
SC284 is also capable of adjusting the output voltage via
an external resistor divider.
The device operates with a fixed 2.5MHz oscillator
frequency, allowing the use of small surface mount
external components.
Connecting CTL0 — CTL3 to logic low forces the device
into shutdown mode reducing the supply current to less
than 1µA. Connecting any of the control pins to logic
high enables the converter and sets the output voltage
according to Table 1. Other features include under-
voltage lockout, soft-start to limit inrush current, and
over-temperature protection.
The SC284 is available in a 3 x 3 x 0.6 (mm) MLPQ-UT20
package and has a rated temperature range of -40 to
+85°C.
Typical Application Circuit
VINA
CINA
10µF
VINB
CINB
10µF
CTL0A
CTL1A
CTL2A
CTL3A
RAVINA 1Ω
CAVINA 10nF
RAVINB 1Ω
CAVINB 10nF
PVINA
AVINA
LXA
VOUTA
AGNDA
LXB
VOUTB
SC284
PVINB
PGNDA
AVINB
AGNDB
PGNDB
CTL0A
CTL1A
CTL2A
CTL3A
CTL0B
CTL1B
CTL2B
CTL3B
LA 2.2µH
LB 2.2µH
COUTA
22µF
COUTB
22µF
VOUTA
VOUTB
CTL0B
CTL1B
CTL2B
CTL3B
Revision 2.0

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 SC284
www.DataSheet.co.kr
SC284
Pin Configuration
20 19 18 17 16
PVINA
AGNDA
AVINA
CTL0A
CTL1A
1
2
3
4
5
TOP VIEW
T
15 CTL1B
14 CTL0B
13 AVINB
12 AGNDB
11 PVINB
6 7 8 9 10
3 x 3 x 0.6(mm) MLPQ-UT20
θJA 40°C/W
Marking Information
284
yyww
xxxx
yyww = Datecode
xxxx = Semtech Lot number
Ordering Information
Device
Package
SC284ULTRT(1)(2)
3 x 3 x 0.6(mm) MLPQ-UT20
SC284EVB(3)
Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Available in lead-free package only. Device is fully WEEE and RoHS
compliant and halogen-free.
(3) Please specify the default VOUTA & VOUTB when ordering.
CTL3_
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Table 1 – Output Voltage Settings
CTL2_ CTL1_ CTL0_
Output Voltage
0 00
0 01
0 10
0 11
1 00
Shutdown
0.80
1.00
1.025
1.05
1 01
1 10
1 11
1.20
1.25
1.30
0 00
1.50
0 01
0 10
0 11
1 00
1 01
1 10
1 11
1.80
2.20
2.50
2.60
2.80
3.00
3.30

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 SC284
www.DataSheet.co.kr
SC284
Absolute Maximum Ratings
VINA and VINB Supply (V) . . . . . . . . . . . . . . . . . . -0.3 to +6.0
LXA, LXB (V) . . . . . . . . . . . . . -1 to VIN+1, -3 (20ns Max), 6 Max
VOUTA, VOUTB (V). . . . . . . . . . . . . . . . . . . . . . . . -0.3 to VIN+0.3
CTLxA/B pins (V). . . . . . . . . . . . . . . . . . . . . -0.3 to (VOUT + 0.3)
Peak IR Reflow Temperature (°C). . . . . . . . . . . . . . . . . . . . . . . . 260
ESD Protection Level(2) (kV) . . . . . . . . . . . . . . . . . . . . . . . . . 3KV
Recommended Operating Conditions
VINA and VINB Supply (V) . . . . . . . . . . . . . . . . . . . . 2.9 to 5.5
Maximum Output current each channel (A). . . . . . . . . . . 1.8
Temperature Range (°C). . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85
Thermal Information
Thermal Resistance, Junction to Ambient (1) (°C/W) . . . . . . . . 40
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . . . . . +150
Storage Temperature Range (°C). . . . . . . . . . . . . . . . . -65 to +150
Exceeding the absolute maximum ratings may result in permanent damage to the device and/or device malfunction. Operation outside of the
parameters specified in the Electrical Characteristics section is not recommended.
Notes:
(1) Calculated from package in still air, mounted to 3 x 4.5 (in), 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: VINA= VINB= 5.0V, VOUTA= VOUTB=1.50V, CINA=CINB=10µF, COA=COB= 22µF, L= 2.2µH, -40°C≤ TJ≤ +125 °C. Unless otherwise noted
typical values are TA= +25 °C.
Parameter
Symbol
Conditions
Min Typ Max Units
Under-Voltage Lockout
UVLO
Rising VINA, VINB
Hysteresis
2.65 2.75
240 300
2.85
V
mV
Output Voltage Tolerance(1)
Current Limit
Supply Current
Shutdown Current
High Side Switch Resistance(2)
Low Side Switch Resistance(2)
LX Leakage Current(2)
Load Regulation
Oscillator Frequency
Soft-Start Time
ΔVOUT
ILIMIT
IQ
ISHDN
RDSON_P
RDSON_N
ILK(LX)
ΔVLOAD-REG
fOSC
tSS
Channel A & B; VIN= 2.9 – 5.5V; IOUT=0A
Channel A & B; Peak LX current
-2.0 +2.0
2.25 3.0
3.75
%
A
Channel A & B; No load, Per channel
10 mA
CTL0-3= GND, Per channel
1 10 µA
Channel A & B; ILX= 100mA, TJ= 25 °C
Channel A & B; ILX= -100mA, TJ= 25 °C
95
65
Channel A & B; VIN= 5.5V; LX= 0V; CTL0-3= GND
1 10
µA
Channel A & B; VIN= 5.5V; LX= 5.0V; CTL0-3= GND
-10
-1
Channel A & B; VIN= 5.0V; IOUT=1mA – 1.8A
±0.5 %
Channel A & B
2.0 2.5
3.0 MHz
Channel A & B; IOUT= 1.8A
850 µs

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Recommended third-party SC284 Datasheet






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