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Buck Converter. SC196A Datasheet

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Buck Converter. SC196A Datasheet






SC196A Converter. Datasheet pdf. Equivalent




SC196A Converter. Datasheet pdf. Equivalent





Part

SC196A

Description

1.5A Synchronous Buck Converter

Manufacture

Semtech

Datasheet
Download SC196A Datasheet


Semtech SC196A

SC196A; 1.5A Synchronous Buck Converter with Int egrated www.DataSheet4U.com Power Devic es POWER MANAGEMENT Description The SC1 96A is a synchronous step-down converte r with integrated power devices. The SC 196A is designed for single-cell Li-Ion battery applications but can also be u sed in fixed 3.3V or 5V applications. The switching frequency is nominally se t to 1MHz, allowing .


Semtech SC196A

the use of small inductors and capacitor s. The maximum current rating of the in ternal MOSFET switches allows a DC outp ut current of 1.5A. Four programable ou tput voltages 1.00V/1.05V/1.20V/ 1.80V are available. See SC196 with external feedback for other output voltage setti ngs. The SC196A has a flexible clockin g methodology that allows it to be sync hronized to an exter.


Semtech SC196A

nal oscillator or controlled by the inte rnal oscillator. The device can operate in either forced PWM mode or in PSAVE mode. If PSAVE mode is enabled, the par t will automatically enter PFM at light loads to maintain maximum efficiency across the full load range. For noise s ensitive applications, PSAVE mode can b e disabled by synchronizing to an exter nal oscillator or pu.



Part

SC196A

Description

1.5A Synchronous Buck Converter

Manufacture

Semtech

Datasheet
Download SC196A Datasheet




 SC196A
POWER MANAGEMENT
Description
The SC196A is a synchronous step-down converter with
integrated power devices. The SC196A is designed for
single-cell Li-Ion battery applications but can also be used
in xed 3.3V or 5V applications. The switching frequency
is nominally set to 1MHz, allowing the use of small
inductors and capacitors. The maximum current rating of
the internal MOSFET switches allows a DC output current
of 1.5A.
Four programable output voltages 1.00V/1.05V/1.20V/
1.80V are available. See SC196 with external feedback
for other output voltage settings.
The SC196A has a exible clocking methodology that
allows it to be synchronized to an external oscillator or
controlled by the internal oscillator. The device can
operate 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.
SC196A
1.5A Synchronous Buck Converter
with Integrated Power Deviceswww.DataSheet4U.com
Features
‹ Up to 93% efciency
‹ 1.00V/1.05V/1.20V/1.80V selectable output voltage
‹ Output current — 1.5A
‹ Quiescent current — 17μA
‹ Input range — 2.7V to 5.5V
‹ Dynamic voltage positioning capability
‹ Fixed 1MHz frequency or 750kHz to 1.25MHz
synchronized operation
‹ PSAVE operation to maximize efciency at light loads
‹ Minimal external components
‹ Fast transient response
‹ 100% duty cycle in dropout
‹ Soft-start
‹ Over-temperature and short-circuit protection
‹ Space-saving lead-free package — MLP-10, 3 x 3mm
Applications
‹ Cell phones
‹ Wireless communication chipset power
‹ Personal media player
‹ Notebook and sub-notebook computers
‹ PDAs and mobile communicators
‹ WLAN peripherals
Typical Application Circuit
VIN
2.7V to 5.5V
CIN
10μF
SC196A
VIN LX
EN
SYNC/PWM
VOUT
VID0
VID1
PGND
MODE
GND
L1
4.7μH
VOUT
1.05V
1.5A
COUT
10μF
July 14, 2008
1 www.semtech.com





 SC196A
SC196A
POWER MANAGEMENT
www.DPatRaSEheLeItM4U.IcNomARY
Absolute Maximum Ratings
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
(SYNC/PWM, EN, MODE, VID0, VID1)
VIN -0.3 to 7
VN -0.3 to VIN+0.3, 7V Max
Output Voltage
VOUT
-0.3 to VIN+0.3, 7V Max
LX Voltage
VLX -1 to VIN +1, -2V(100ns Max),7V Max
Thermal Impedance Junction to Ambient(1)
θJA
40
VOUT Short-Circuit to GND
tSC Continuous
Operating Ambient Temperature Range
TA
-40 to +85
Storage Temperature
TS -60 to +150
Junction Temperature
TJ -40 to +150
Peak IR Reow Temperature
TPKG
260
ESD Protection Level (2)
VESD
2
Note:
(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.
V
V
V
V
°C/W
s
°C
°C
°C
°C
kV
Electrical Characteristics
Unless otherwise noted: VIN = 3.6V, EN = VIN, SYNC/PWM = VIN, MODE = VIN , TA = -40 to 85°C. Typical values are at TA = 25°C.
Parameter
Symbol
Conditions
Min Typ
Input Voltage Range
VOUT Accuracy
VOUT Temperature Accuracy
Line Regulation
Load Regulation (PWM)
PSAVE Regulation
P-Channel On Resistance
N-Channel On Resistance
Start-Up Time
P-Channel Current Limit
VIN
VOUT
VOUT(T)
VOUT LINE
VOUT LOAD
VOUT PSAVE
RDSP
RDSN
TSTART
ILIM(P)
IOUT = 0.75A, TA = 25°C
IOUT = 0.75A, TA = -40 to 85°C
VIN = 2.7V to 5.5V, VOUT = 1.8V,
IOUT = 0.75A, TA = -40 to 85°C
IOUT = 0A to 1.5A, TA = -40 to 85°C
SYNC/PWM =GND, COUT=22 μF
ILX = 100mA
ILX = 100mA
2.7
±0.3
±0.4
±0.3
+1.3
-0.3
0.275
0.165
1.9
© 2008 Semtech Corp.
2
Max Units
5.5 V
±1 %
±0.7 %
±0.65
%
±0.65
+1.6
-0.6
5
2.63
%
%
Ω
Ω
ms
A
www.semtech.com





 SC196A
SC196A
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Quiescent Current
Shutdown Current
LX Leakage Current PMOS
LX Leakage Current NMOS
Oscillator Frequency
SYNC Frequency (upper)
SYNC Frequency (lower)
UVLO Threshold (upper)
UVLO Hysteresis
Thermal Shutdown
Thermal Shutdown Hysteresis
Logic Input High
Logic Input Low
Logic Input Current High
Logic Input Current Low
Symbol
IQ
ISD
ILXP
ILXN
fOSC
fSYNCU
fSYNCL
VUVL
VUVLHYS
TSD
TSD-HYS
VIH
VIL
IIH
IIL
Conditions
SYNC/PWM = GND, IOUT = 0A,
VOUT = 1.04 x VOUT(Programmed)
EN = GND, LX = OPEN
LX = GND, EN = GND
LX = 3.6V, EN = GND
EN, SYNC/PWM, VID0, VID1, MODE
EN, SYNC/PWM, VID0, VID1, MODE
EN, SYNC/PWM, VID0, VID1, MODE
EN, SYNC/PWM, VID0, VID1, MODE
Min
-2
0.85
1.25
2.38
1.2
-2
-2
www.DPatRaSEheLeItM4U.IcNomARY
Typ Max Units
17 28 μA
0.1 1
μA
0.1 2
μA
0.1 μA
1.0 1.15 MHz
MHz
750 kHz
2.52 2.65
V
135 mV
145 °C
10 °C
V
0.4 V
0.1 2
μA
0.1 2
μA
© 2008 Semtech Corp.
3
www.semtech.com



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