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Buck Converter. SC196 Datasheet

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Buck Converter. SC196 Datasheet






SC196 Converter. Datasheet pdf. Equivalent




SC196 Converter. Datasheet pdf. Equivalent





Part

SC196

Description

1.5A Synchronous Buck Converter



Feature


1.5A Synchronous Buck Converter with Int egrated www.DataSheet4U.com Power Devic es POWER MANAGEMENT Description The SC1 96 is a synchronous step-down converter with integrated power devices designed for use in applications using a single -cell Li-ion battery. Its wide input vo ltage range also makes it suitable for use in systems with fixed 3.3V or 5V s upply rails availabl.
Manufacture

Semtech

Datasheet
Download SC196 Datasheet


Semtech SC196

SC196; e. The switching frequency is nominally set to 1MHz, allowing the use of small inductors and capacitors. The current r ating of the internal MOSFET switches a llows a DC output current of 1.5A. The output voltage is set by connecting a r esistor divider from the filter induct or to the feedback pin. See the SC196A for pin-programmable output voltages. T he SC196 has a flexib.


Semtech SC196

le clocking methodology that allows it t o be synchronized to an external oscill ator or controlled by the internal osci llator. The device operates in either f orced PWM mode or in PSAVE mode. If PSA VE mode is enabled, the part will autom atically enter PFM at light loads to ma intain maximum efficiency across the f ull load range. For noise sensitive app lications, PSAVE mod.


Semtech SC196

e can be disabled by synchronizing to an external oscillator or pulling the SYN C/PWM pin high. Shutdown turns off all the control circuitry to achieve a typi cal shutdown current of 0.1μA. SC196 Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Up to 95% efficiency VOUT ad justable from less than 0.8V to VIN Out put current — 1.5A Input range — 2. 5V to 5.5V Quiescent current — 17μA Fi.

Part

SC196

Description

1.5A Synchronous Buck Converter



Feature


1.5A Synchronous Buck Converter with Int egrated www.DataSheet4U.com Power Devic es POWER MANAGEMENT Description The SC1 96 is a synchronous step-down converter with integrated power devices designed for use in applications using a single -cell Li-ion battery. Its wide input vo ltage range also makes it suitable for use in systems with fixed 3.3V or 5V s upply rails availabl.
Manufacture

Semtech

Datasheet
Download SC196 Datasheet




 SC196
POWER MANAGEMENT
Description
The SC196 is a synchronous step-down converter with
integrated power devices designed for use in applications
using a single-cell Li-ion battery. Its wide input voltage
range also makes it suitable for use in systems with xed
3.3V or 5V supply rails available. The switching frequency is
nominally set to 1MHz, allowing the use of small inductors
and capacitors. The current rating of the internal MOSFET
switches allows a DC output current of 1.5A.
The output voltage is set by connecting a resistor divider
from the lter inductor to the feedback pin. See the
SC196A for pin-programmable output voltages.
The SC196 has a exible clocking methodology that
allows it to be synchronized to an external oscillator or
controlled by the internal oscillator. The device operates
in either forced PWM mode or in PSAVE mode. If PSAVE
mode is enabled, the part will automatically enter PFM at
light loads to maintain maximum efciency across the full
load range.
For noise sensitive applications, PSAVE mode can be
disabled by synchronizing to an external oscillator or
pulling the SYNC/PWM pin high. Shutdown turns off all
the control circuitry to achieve a typical shutdown current
of 0.1μA.
SC196
1.5A Synchronous Buck Converter
with Integrated Power Deviceswww.DataSheet4U.com
Features
‹ Up to 95% efciency
‹ VOUT adjustable from less than 0.8V to VIN
‹ Output current — 1.5A
‹ Input range — 2.5V to 5.5V
‹ Quiescent current — 17μA
‹ Fixed 1MHz frequency or 750kHz to 1.25MHz
synchronized operation
‹ PSAVE operation to maximize efciency at light loads
‹ Shutdown current <1μA
‹ Fast transient response
‹ 100% duty cycle in dropout
‹ Soft-start
‹ Over-temperature and short-circuit protection
‹ Lead-free package — MLPD10-UT, 3 x 3 x 0.6 mm
Applications
‹ Cell phones
‹ Wireless communication chipset power
‹ Personal media players
‹ Microprocessor/DSP core/IO power
‹ PDAs and handheld computers
‹ WLAN peripherals
‹ USB powered modems
‹ 1 Li-Ion or 3 NiMH/NiCd powered devices
Typical Application Circuit
VIN
2.5V to 5.5V
CIN
10μF
VIN SC196
LX
PVIN
VOUT
MODE
ADJ
EN
SYNC/PWM
PGND
GND
L1
4.7μH
RFB1
RFB2
VOUT
<0.8V to VIN
1.5A
CFB1
10pF
COUT
22μF
February 8, 2007
1 www.semtech.com




 SC196
SC196
POWER MANAGEMENT
www.DPatRaSEheLeItM4U.IcNomARY
Absolute Maximum Rating
Exceeding the specications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specied in the
Electrical Characteristics section is not recommended.
Parameter
Symbol
Maximum
Units
Input Supply Voltage
Logic Inputs
(N=SYNC/PWM, EN, MODE)
VIN
-0.3 to 7
V
VN
-0.3 to VIN+0.3, 7V Max
V
Output Voltage
VOUT
-0.3 to VIN+0.3, 7V Max
V
ADJ Input
VADJ
-0.3 to VIN+0.3, 7V Max
V
LX Voltage
VLX
-1 to VIN +1, 7V Max
V
Thermal Impedance Junction to Ambient(1)
θJA
40 °C/W
VOUT Short-Circuit to GND
tSC
Continuous
s
Operating Ambient Temperature Range
TA
-40 to +85
°C
Storage Temperature
TS
-65 to +150
°C
Junction Temperature
TJ
-40 to +150
°C
Peak IR Reow Temperature
TPKG
260 °C
ESD Protection Level (2)
VESD
2
Notes:
(1) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
(2) Tested according to JEDEC standard JESD22-A114-B.
kV
Electrical Characteristics
Unless otherwise noted: VIN = 3.6V, VOUT = 1.8V, EN = VIN, SYNC/PWM = VIN, MODE = VIN , TA = -40 to 85°C. Typical values are at TA = 25°C.
Parameter
Symbol
Conditions
Min Typ Max
Units
Input Voltage Range
UVLO Threshold (upper)
UVLO Hysteresis
Output Voltage Range
FB Voltage Tolerance
Load Regulation (PWM)
PSAVE Regulation
P-Channel Current Limit
Quiescent Current
Shutdown Current
VIN
VUVL
VUVLHYS
VOUT
VFB VIN = 2.5V to 5.5V, IOUT = 0mA to 1.5A
VOUT LOAD
VOUT PSAVE
ILIM(P)
IQ
ISD
IOUT = 0mA to 1.5A
SYNC/PWM=GND,COUT = 22μF,
VIN = 2.5V to 5.5V, IOUT = 0mA to 1.5A
VIN=2.5V to 5.5V
SYNC/PWM = GND, IOUT = 0A,
VOUT = 1.04 x VOUT(Programmed)
EN = GND, LX = OPEN
2.5
2.18
0.8
0.485
1.96
2.3
150
0.5
±0.5
±2
2.8
17
0.1
5.5
2.45
VIN
0.515
±1
±3
3.57
28
1
V
V
mV
V
V
%
%
A
μA
μA
© 2007 Semtech Corp.
2
www.semtech.com




 SC196
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Symbol
P-Channel On Resistance
N-Channel On Resistance
LX Leakage Current PMOS
LX Leakage Current NMOS
Oscillator Frequency
SYNC Frequency (upper)
SYNC Frequency (lower)
Start-Up Time
Thermal Shutdown
Thermal Shutdown Hysteresis
Logic Input High(1)
Logic Input Low(1)
Logic Input Current High(1)
Logic Input Current Low(1)
Note:
(1) For EN, SYNC/PWM, MODE
RDSP
RDSN
ILXP
ILXN
fOSC
fSYNCU
fSYNCL
tSTART
TSD
TSD-HYS
VIH
VIL
IIH
IIL
Conditions
ILX = 100mA
ILX = 100mA
LX = GND, EN = GND
LX = 3.6V, EN = GND
SC196
www.DPatRaSEheLeItM4U.IcNomARY
Min Typ Max Units
0.275
Ω
0.165
Ω
0.1 2 μA
-2 0.1
μA
0.85 1.0 1.15 MHz
1.25 MHz
750 kHz
5 ms
145 °C
10 °C
1.2 V
0.4 V
-2 0.1 2 μA
-2 0.1 2 μA
© 2007 Semtech Corp.
3
www.semtech.com






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