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PDF SC190 Data sheet ( Hoja de datos )
| Número de pieza | SC190 | |
| Descripción | Synchronous Buck Converter | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC190 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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POWER MANAGEMENT
Description
SC190
Synchronous Buck Converter
with Programmwwaw.bDaltaeSheOet4uU.ctopmut
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The SC190 is a synchronous step-down converter with
integrated power devices and an integrated front-end
LDO to minimize input supply ripple. Output voltage is
programmable using two control bits, eliminating the need
for feedback resistors tied to the output. The device is
offered in four distinct variants with each variant providing
four fixed output voltage options to choose from.
The front-end LDO can be bypassed externally to maximize
efficiency. A second LDO is switched in place of the
switching regulator for low current operation to further
improve efficiency and reduce noise.
The SC190’s flexible clocking scheme allows it to be
synchronized to an external oscillator or controlled by the
internal oscillator. The 1MHz switching frequency allows
the use of small inductors and capacitors.
Less than 1mV Supply Ripple
Output Voltage Regulated by Either the Switching
Regulator or Linear Regulator
Dynamic Handover Between Linear and Switching
Regulator for Maximum Efficiency
2.7V to 5.5V Input Range
300mA Guaranteed Output Current
Fixed Frequency 1MHz Operation or 750kHz to
1.5MHz Clocked Operation
No Schottky Diode Required
Up to 95% Efficiency (VIN=BP)
Over-current Protection
Over-voltage Protection
Over-temperature Protection
Soft Start
MLP-10, 3 x 3mm Lead-frame, Lead-free Package
Low Output Noise < 100µVrms
The internal MOSFET switches provide peak current
greater than 500mA to achieve a DC output of at least
300mA. Shutdown current is typically 0.1µA.
The SC190 has four different variants with four voltage
settings each. It is designed for single-cell Li-ion battery
applications, but also performs well in fixed 3.3V and 5V
applications.
Applications
Cell Phones
Cordless Phones
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
WLAN Peripherals
1 Li-Ion or 3 NiMH/NiCd Powered Devices
Typical Application Circuit
VIN
CIN
4.7µF
VIN SC190 LX
EN VOUT
SYNC/PWM
VID0
VID1
MODE
BP
GND
4.7µH
LOUT
VOUT
CBP
4.7µF
COUT
4.7µF
June 30, 2005
1 www.semtech.com
1 page  
POWER MANAGEMENT
Pin Configuration
BP
VIN
VOUT
EN
MODE
1
2
3
4
5
TOP VIEW
T
10 LX
9 GND
8 VID1
7 VID0
6 SYNC/PWM
MLP10: 3X3 10 LEAD
SC190
Ordering Information
www.DataSheet4U.com
Device
Package
SC190AIMLTRT(1)
SC190BIMLTRT(1)
SC190CIMLTRT(1)
MLP 3X3-10
SC190DIMLTRT(1)
SC190AEVB
SC190BEVB
Evaluation Board(2)
SC190CEVB
SC190DEVB
(1) Lead-free packaging only. This product is fully WEEE and RoHS
compliant. Available on tape and reel only. A reel contains 3000
devices.
(2) Part specific evaluation boards - consult factory for availability.
Pin Descriptions
Pin #
1
Pin Name
BP
2 VIN
3 VOUT
4 EN
5 MODE
6 SYNC/PWM
7 VID0
8 VID1
9 GND
10 LX
T Thermal
Programmable Output Voltage
VID1 VID0 SC190A SC190B SC190C
0 0 1.8V 1.2V 2.5V
0
1
1.85V
1.5V
2.8V
1
0
1.75V
1.0V
2.6V
1 1 1.9V 1.8V 2.7V
SC190D
1.3V
1.35V
1.375V
1.4V
Pin Function
Regulated output, with respect to VIN, of the front-end LDO. A decoupling capacitor is connected to
this pin. This input goes directly to the internal MOSFET switch.
Input power supply voltage.
Regulated output voltage and feedback for SC190.
Enable (digital input): high input enables the SC190, a low disables and reduces quiescent current to
0.1µA. In shutdown, LX becomes high impedance.
Mode select pin (digital input): MODE = VIN - linear regulator mode; MODE = GND - switcher mode.
Oscillator synchronization input. Tie to VIN for forced continuous mode or external clock for frequency
synchronization.
Logic level Bit 0 used in conjunction with VID1 to set the output voltage.
Logic level Bit 1 used in conjunction with VID0 to set the output voltage.
Ground.
Inductor connection to the switching FETs.
Pad for heatsinking purposes. Not connected internally. Connects to ground plane using multiple
vias.
2005 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Applications Information (Cont.)
CIN Selection
The source input current to the SC190 buck converter is
a DC supply current with a triangular ripple riding on it.
To prevent large input voltage ripple a low ESR ceramic
capacitor is required. A minimum value of 4.7µF should
be used for sufficient input voltage filtering and a 10µF
MLCC should be used for optimum input voltage filtering.
Input voltage ripple of approximately 1mV can be achieved
wanhdenpCrIeN-=re1g0ulµaFt,inagndththee
front-end LDO
input supply
regulator is active
to the switching
regulator. (See page 12: Input Voltage Ripple graphs).
COUT Selection
A 10µF ceramic capacitor is recommended for the output
filter capacitor. Output voltage ripple is dominated by the
filter capacitance as shown in the following equation:
Vout _ ripple = ∆IL(ripple) • Cout(ESR)
Choose an X7R or X5R ceramic dielectric for low ESR and
superior temperature and voltage characteristics. Do not
use Y5V capacitors - their temperature coefficients make
them impractical for this application.
SC190
www.DataSheet4U.com
Table 3: Recommended Capacitors
Manufacturer
Murata
Murata
TDK
Part Number
GRM188R60J475KE19D
GRM188R60G106ME47D
C1608X5ROG106M
Value
(µF)
4.7
10
10
Rated Voltage
(VDC)
6.3
4
4
Type
X5R
X5R
X5R
Case Size
0603
0603
0603
2005 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SC190.PDF ] | |
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