SC196 PDF даташит
Спецификация SC196 изготовлена «Semtech» и имеет функцию, называемую «1.5A Synchronous Buck Converter». |
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Детали детали
Номер произв | SC196 |
Описание | 1.5A Synchronous Buck Converter |
Производители | Semtech |
логотип |
18 Pages
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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 fixed
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 filter inductor to the feedback pin. See the
SC196A for pin-programmable output voltages.
The SC196 has a flexible 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 efficiency 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% efficiency
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 efficiency 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
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SC196
POWER MANAGEMENT
www.DPatRaSEheLeItM4U.IcNomARY
Absolute Maximum Rating
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 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 Reflow 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.
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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
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