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PDF SC186 Data sheet ( Hoja de datos )
| Número de pieza | SC186 | |
| Descripción | 4A Synchronous Step-Down Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC186 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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POWER MANAGEMENT
SC186
4A Synchronous
Step-Down Regulator
Features
Input Voltage Range — 2.9 to 5.5V
Output Voltage Range — 0.8V to 3.3V
Output Current — up to 4A
Ultra-Small Footprint — <1mm Height Solution
Switching Frequency — 1.5MHz
Automatic Power Save Mode
Efficiency Up to 95%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
Duty-Cycle Low Dropout Operation — 100%
Shutdown Current — <1µA
Externally Programmable Soft Start Time
Power Good indicator
Input Under-Voltage Lockout
Output Over-Voltage, Current Limit Protection
Over-Temperature Protection
Thermally Enhanced 3 x 3 x 0.6 (mm)
MLPQ-UT16 package
Temperature Range — -40 to +85°C
Lead-free, Halogen free, and RoHS/WEEE compliant
Applications
Routers and Network Cards
LCD TV
Office Automation
Printers
Typical Application Circuit
Description
The SC186 is a 4A synchronous step-down regulator
designed to operate with an input voltage range of 2.9V
to 5.5V. The device offers fifteen pre-determined output
voltages via four control pins programmable from 0.8 to
3.3 Volts. The control pins allow for on-the-fly voltage
changes, enabling system designers to implement
dynamic power savings. The device is also capable of
adjusting output voltage via an external resistor divider.
The SC186 is optimized for maximum efficiency over a
wide range of load currents. During full load operation,
the device operates in PWM mode with fixed 1.5MHz
oscillator frequency, allowing the use of small surface
mount external components. As the load decreases, the
regulator will transition into Power Save mode maintain-
ing high efficiency.
Connecting the control pins to logic low forces the device
into shutdown mode reducing the supply current to less
than 1μA. Connecting any of the control pins to logic high
enables the converter and sets the output voltage accord-
ing to Table 1. Other features include under-voltage
lockout, programmable soft-start to limit in-rush current,
power good indicator, over-temperature protection, and
output short circuit protection.
The SC186 is available in a thermally-enhanced, 3 x 3 x 0.6
(mm) MLPQ-UT16 package.
VIN
CIN
22µF
RPGOOD
100kΩ
RAVIN
1Ω
CAVIN
0.1µF
CTL0
CTL1
CTL2
CTL3
PVIN
LX
SC186
AVIN
PGOOD
CTL0
CTL1
CTL2
CTL3
VOUT
SS
CSS
10nF
PGND
AGND
L
1.0µH
COUT
47µF
VOUT
Revision 2.0
© 2011 Semtech Corporation
1 page  
SC186
Pin Descriptions
Pin #
1, 16
2
3
4, 5, 6, 7
8
9
10
11,12,13
14,15
T
Pin Name Pin Function
PVIN
AGND
AVIN
CTLx
Input supply voltage for the converter power stage
Ground connection for the internal circuitry — AGND needs to be connected to PGND directly.
Power supply for the internal circuitry — AVIN is required to be connected to PVIN through an R-C filter of 1Ω
and 100nF.
Control bit — see Table 1 for decoding. These pins have 500kΩ internal pull-down resistors which are switched
in circuit whenever CTLx is low or when the part is in under-voltage lockout.
PGOOD
Power good indicator — when the output voltage reaches the PGOOD threshold, this pin will be open-drain
(after the PGOOD delay), otherwise, it is pulled low internally.
SS
Soft Start — Connect a soft-start capacitor to program the soft start time. There is a 5µA charging current
flowing out of the pin.
VOUT
Output voltage sense pin
PGND
Ground connection for converter power stage
LX Switching node — connect an inductor between this pin and the output capacitor.
Thermal Pad Thermal pad for heat sinking purposes — recommend to connect to PGND. It is not connected internally.
5 Page 
SC186
Typical Characteristics (continued)
Circuit Conditions: CIN = 22µF/6.3V, COUT = 2 x 22µF/6.3V, CSS = 10nF. Unless otherwise noted, L = 1.0µH (TOKO: FDV0530S-1R0).
Output Short Circuit
Recovery from Short Circuit
VIN = 5V; VOUT = 1.5V
VIN = 5V; VOUT = 1.5V
VCTLx (5V/div)
PGOOD (5V/div)
VOUT (1V/div)
VCTLx (5V/div)
PGOOD (5V/div)
VOUT (1V/div)
IOUT (5V/div)
Time (20µs�/�d��i�v�)
Output Short Circuit
VIN = 5V; VOUT = 3.3V
VCTLx (5V/div)
PGOOD (5V/div)
VOUT (2V/div)
IOUT (5V/div)
Time (20µs�/�d��i�v�)
IOUT (2V/div)
Time (20µs�/�d��i�v�)
Recovery from Short Circuit
VIN = 5V; VOUT = 3.3V
VCTLx (5V/div)
PGOOD (5V/div)
VOUT (2V/div)
IOUT (2V/div)
Time (20µs�/�d��i�v�)
Transient Response (VOUT=1.5V, ISTEP=2A)
VIN = 5V; IOUT = 1A to 3A to 1A
Transient Response (VOUT=3.3V, ISTEP=2A)
VIN = 5V; IOUT = 1A to 3A to 1A
VOUT (100mV/div)
VOUT (100mV/div)
IOUT (1A/div)
Time (20µs�/�d��i�v�)
IOUT (1A/div)
Time (20µs�/�d��i�v�)
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SC186.PDF ] | |
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