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PDF SC284 Data sheet ( Hoja de datos )
| Número de pieza | SC284 | |
| Descripción | 1.8A Synchronous Step-Down Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC284 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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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
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
SC284
Typical Characteristics
Circuit Conditions: CIN= 10uF/6.3V; COUT= 22uF/6.3V, Unless otherwise noted, L= 2.2uH (TOKO: 1127AS-2R2M).
Efficiency vEs.ffLicoieancdy Current
Total Loss (Per ChaTnontael Ll)osvss. Load Current
100%
95%
90%
VIN=5.0V;VOUT=3.3V
1000
800
TA=25°C
VIN=5.0V;VOUT=3.3V
85%
80%
75%
VIN=3.3V;VOUT=1.5V
600
VIN=3.3V;VOUT=1.5V
400
70%
65%
TA=25°C
60%
0.0
0.3
VIN=5.0V;VOUT=1.5V
0.6 0.9 1.2 1.5 1.8
Output Current (A)
200
VIN=5.0V;VOUT=1.5V
0
0.0 0.3 0.6 0.9 1.2 1.5
Output Current (A)
1.8
LoadLoRaed gReuglualatitioonn
1.0%
0.8%
TA=25°C
0.6%
0.4%
VIN=3.3V;VOUT=1.5V
0.2%
0.0%
VIN=5.0V;VOUT=1.5V
-0.2%
-0.4%
-0.6%
-0.8%
VIN=5.0V;VOUT=3.3V
-1.0%
0.0 0.3 0.6 0.9 1.2 1.5
Output Current (A)
1.8
UVLOURViLsOinRgisiTnhg rTehsrehshoolldd VVaariraitaiotnion
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
-0.2%
-0.4%
-0.6%
-0.8% IOUT= 0A
-1.0%
-40
-15
10 35
Ambient Temperature (°C)
60
85
Dropout Voltage in 100% Duty Cycle Operation
Dropout Voltage of 100% Duty Cycle Operation
500
450 TA= 25°C
400
L= 1071AS-2R2M
350 (DCR= 60m_max)
300
250
200
150
100 L= 1127AS-2R2M
50 (DCR=48m_max)
0
0.0 0.3 0.6 0.9 1.2 1.5 1.8
Output Current (A)
UVLOUVHLyOsHtyesrteerseissisVVaarriiaatitoinon
5%
4%
3%
2%
1%
0%
-1%
-2%
-3%
-4% IOUT= 0A
-5%
-40 -15
10 35
Ambient Temperature (°C)
60
85
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
Block Diagram
AVINA 3
VOUTA 18
CTL0A 4
CTL1A 5
CTL2A 6
CTL3A 7
AGNDA 2
AVINB 13
Oscillator and
Slope Generator
Voltage
Select
VOUTB 8
CTL0B 14
CTL1B 15
CTL2B 16
CTL3B 17
AGNDB 12
Oscillator and
Slope Generator
Voltage
Select
Plimit Amp
Current Amp
PWM
Comp
Error Amp
500mV
Ref
Control
Logic
Plimit Amp
Current Amp
PWM
Comp
Error Amp
500mV
Ref
Control
Logic
SC284
1 PVINA
20 LXA
19 PGNDA
11 PVINB
10 LXB
9 PGNDB
11
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SC284.PDF ] | |
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