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Buck Converter. SC190 Datasheet

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Buck Converter. SC190 Datasheet






SC190 Converter. Datasheet pdf. Equivalent




SC190 Converter. Datasheet pdf. Equivalent





Part

SC190

Description

Synchronous Buck Converter



Feature


POWER MANAGEMENT Description The SC190 i s a synchronous step-down converter wit h integrated power devices and an integ rated front-end LDO to minimize input s upply ripple. Output voltage is program mable using two control bits, eliminati ng the need for feedback resistors tied to the output. The device is offered i n four distinct variants with each vari ant providing four.
Manufacture

Semtech

Datasheet
Download SC190 Datasheet


Semtech SC190

SC190; fixed output voltage options to choose from. The front-end LDO can be bypasse d externally to maximize efficiency. A second LDO is switched in place of the switching regulator for low current op eration to further improve efficiency and reduce noise. SC190 Synchronous Bu ck Converter with Programmable Output w ww.DataSheet4U.com Features Features Less than 1mV Supply Ri.


Semtech SC190

pple  Output Voltage Regulated by Eit her the Switching     Regul ator or Linear Regulator Dynamic Handov er Between Linear and Switching Regulat or for Maximum Efficiency 2.7V to 5.5V Input Range 300mA Guaranteed Output Cu rrent Fixed Frequency 1MHz Operation or 750kHz to 1.5MHz Clocked Operation No Schottky Diode Required Up to 95% Effi ciency (VIN=BP) Over-current Pro.


Semtech SC190

tection Over-voltage Protection Over-tem perature Protection Soft Start MLP-10, 3 x 3mm Lead-frame, Lead-free Package L ow Output Noise < 100µVrms    The SC190’s flexible clocking scheme allows it to be  synchronized to an external oscillator or controlle d by the  internal oscillator. The 1 MHz switching frequency allows  the use of small inductors and capacitors.

Part

SC190

Description

Synchronous Buck Converter



Feature


POWER MANAGEMENT Description The SC190 i s a synchronous step-down converter wit h integrated power devices and an integ rated front-end LDO to minimize input s upply ripple. Output voltage is program mable using two control bits, eliminati ng the need for feedback resistors tied to the output. The device is offered i n four distinct variants with each vari ant providing four.
Manufacture

Semtech

Datasheet
Download SC190 Datasheet




 SC190
POWER MANAGEMENT
Description
SC190
Synchronous Buck Converter
with Programmwwaw.bDaltaeSheOet4uU.ctopmut
FFeeaattuurreess
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




 SC190
SC190
POWER MANAGEMENT
www.DataSheet4U.com
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 Input
Logic Inputs (SYNC/PWM,
EN, MODE, VID0, and VID1)
LX Voltage
VOUT Voltage
BP Voltage
Thermal Impedance Junction to Ambient
VOUT Short Circuit to GND
BP Current
LX Current
Storage Temperature
Junction Temperature
Peak IR Reflow Temperature
* Tied to PCB with 1 square inch, 2 ounce copper.
Symbol
VIN
VN
VLX
VOUT
VBP
θJA
tSC
IBP
ILX
TS
TJC
TLEAD
Maximum
-0.3 to 7
-0.3 to 7
-1 to BP +1
-0.3 to VIN + 0.3
VIN -0.3 to VIN + 0.3
*31
Continuous
0.8
+1.2
-65 to +150
+150
260
Units
V
V
V
V
V
°C/W
s
A
A
°C
°C
°C
Electrical Characteristics
Unless otherwise noted: VIN = 3.6V, SYNC/PWM = VIN, MODE = GND, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. This device is ESD sensitive.
Use of standard ESD handling precautions is required.
Parameter
Input Voltage Range
Input Voltage Ripple
Line Regulation
Symbol
VIN
VIN PK-PK
VLINEREG
Load Regulation
P-Channel On Resistance
N-Channel On Resistance
Start Up Time
VLOADREG
RDSP
RDSN
TSTART
Conditions
VIN = VBP
VIN ≠ VBP
CIN, CBP = 10µF
190A, B and D: see note (1)
190C: see note (2)
IOUT = 5mA to 300mA
ILX = 100mA
ILX = 100mA
IOUT = 150mA
Min Typ Max Units
2.7 5.5 V
2.9 5.5 V
1 mV
-0.3 0.3 %/V
-0.5 0.5 %/V
0.002
%/mA
0.3 Ω
0.2 Ω
1.25 ms
2005 Semtech Corp.
2
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 SC190
SC190
POWER MANAGEMENT
www.DataSheet4U.com
Electrical Characteristics (Cont.)
Unless otherwise noted: VIN = 3.6V, SYNC/PWM = VIN, MODE = GND, EN = VIN, TA = -40 to 85°C. Typical values are at TA = +25°C. This device is ESD sensitive.
Use of standard ESD handling precautions is required.
Parameter
Symbol
Conditions
Min Typ Max Units
VOUT Accuracy
VOUT
Back-end LDO
Load Regulation (BELDO)
VOUTLOADREG
Back-end LDO Line
Regulation (BELDO)
Back-end LDO
Current Limit (BELDO)
Front-end LDO (FELDO)
VOUTLINEREG
Iout LIMLDO
VBP
IOUT = 150mA
MODE = VIN, IOUT = 1mA
IOUT = 150mA, TA = +25°C
MODE = VIN, IOUT = 1mA,
TA = +25°C
IOUT= 100µA to 5mA
MODE = VIN
VIN = 2.7V to 5.5V
MODE = VIN
MODE = VIN
IBP = 180mA(3)
P-Channel Current Limit
N-Channel Current Limit
Quiescent Current
Shutdown Current
LX Leakage Current PMOS
LX Leakage Current NMOS
Output Voltage Noise
ILIM(P)
ILIM(N
IQ
ISD
ILXP
ILXN
en
MODE = VIN, IOUT = 100µA(4)
EN = 0
VIN = 5.5V, LX = 0V, EN = 0
VIN = 5.5V, LX = 5.5V, EN = 0
COUT = 4.7µF, VOUT = 1V,
IOUT = 1mA, 100Hz < f < 100kHz
Oscillator Frequency
fOSC
SYNC Frequency (upper)
fSYNCU
SYNC Frequency (lower)
fSYNCL
2005 Semtech Corp.
3
-3
3
-1.5
-1.5
-0.1
-0.3
20
500
-270
-20
0.87
3%
3%
1.5 %
1.5 %
0.1 %/mA
0.3 %/V
40 60
300 325
630 860
-420 -520
10 15
0.1 1
0.1 1
0.1
mA
mV
mA
mA
µA
µA
µA
µA
93 µVRMS
1.0 1.12 MHz
1.5 MHz
750 kHz
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