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PDF SC9301 Data sheet ( Hoja de datos )
| Número de pieza | SC9301 | |
| Descripción | Integrated FET Regulator | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC9301 (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
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SC9301
POWER MANAGEMENT
10A EcoSpeed® Integrated FET
Regulator with 5V LDO and Hiccup Restart
Features
Power system
• Input voltage — 3V to 28V
• Bias Voltage — 5V LDO or 3V to 5.5V external
• Up to 96% peak efficiency
• Integrated bootstrap switch
• LDO output current — up to 200mA
• Reference tolerance — 1% T = -40 to +125 °C
J
• EcoSpeed® architecture with pseudo-fixed fre-
quency adaptive on-time control
• Pre-bias start-up
Logic input and output control
• Independent enable control for LDO and
switcher
• Programmable VIN UVLO threshold
• Power good output
• Programmable soft-start time
All protection: automatic restart on fault
• Over-voltage and under-voltage
• TC compensated R sensed current limit
• DS(ON)
Thermal shutdown
Smart gate drive reduces EMI
Capacitor types: SP, POSCAP, OSCON, and ceramic
Package — 5 x 5(mm), 32-pin MLPQ
Lead-free and halogen-free
RoHS and WEEE compliant
Description
The SC9301 is a stand-alone synchronous EcoSpeed® buck
regulator with adaptive on-time control architecture. It
features integrated power MOSFETs, a bootstrap switch,
and a fixed 5V LDO in a 5x5mm package. The device is
highly efficient and uses minimal PCB area. The SC9301
supports using standard capacitor types such as electro-
lytic or specialty polymer, in addition to ceramic, at switch-
ing frequencies up to 1MHz.
Additional features include programmable cycle-by-cycle
current limit protection, programmable soft-start, under
and over-voltage protection, automatic fault recovery
(hiccup restart), and soft shutdown. The device also pro-
vides separate enable inputs for the PWM controller and
LDO as well as a power good output for the PWM
controller.
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Applications
Networking and telecommunication equipment
Printers, DSL, and STB applications
Point-of-load power supplies and module replacement
Typical Application Circuit
RTON
EN
ENL
TON
VDD
1 μF
CSOFT
SS
VIN
CIN
VIN
SC9301
ILIM
LXS
PGOOD
VOUT
LX
CBST
FB
RILIM
L1
RFB1
RFB2
PGOOD
VOUT
+
COUT
Rev. 2.0
© Semtech Corporation
1
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
SC9301
Electrical Characteristics (continued)
Parameter
Conditions
Min Typ Max Units
Fault Protection
Valley Current Limit(3)
I Source Current
LIM
I Comparator Offset
LIM
Output Under-Voltage Threshold
Smart Power-Save Protection Threshold(2)
Over-Voltage Protection Threshold
Over-Voltage Fault Delay(2)
VDD = 5V, R = 7320, T = 0 to +125 °C
ILIM J
VDD = 3.3V, R = 7320, T = 0 to +125 °C
ILIM J
Trimmed to match lower FET Rdson
With respect to AGND
V with respect to internal 600mV reference,
FB
8 consecutive cycles
V with respect to internal 600mV reference
FB
V with respect to internal 600mV reference
FB
8.5 10 11.5 A
9A
9 μA
-8 0 +8 mV
-25 %
+10 %
+20 %
5 μs
Over-Temperature Shutdown(2)
10°C hysteresis
150 °C
Logic Inputs/Outputs
Logic Input High Voltage
EN, ENL
1.0
V
Logic Input Low Voltage
EN, ENL
0.4 V
EN Input Bias Current
EN = VDD or AGNDwww.DataSheet.net/
-10 +10 μA
ENL Input Bias Current
FB Input Bias Current
ENL = V = 28V
IN
FB = VDD or AGND
-1 11 +18 μA
-1 +1 μA
Linear Regulator (LDO)
VLDO Accuracy
VLDO load = 10mA
4.90 5.0 5.10
V
Current Limit
Short-circuit protection, V = 12V, VLDO < 1V
IN
V = 12V, 1V < VLDO < 4.5V
IN
Operating, VLDO > 4.5V
20
115 mA
200
VLDO Drop Out Voltage(4)
V to VLDO, VLDO load = 100mA
IN
1.9
Notes:
(1) VIN UVLO is programmable using a resistor divider from VIN to ENL to AGND. The ENL voltage is compared to an internal reference.
(2) Typical value measured on standard evaluation board.
(3) The device has first order temperature compensation for over current. Results vary based upon the PCB thermal layout.
(4) The LDO drop out voltage is the voltage at which the LDO output drops 2% below the nominal regulation point.
V
5
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
SC9301
Pin Descriptions
Pin #
1
2
Pin Name Pin Function
Feedback input for switching regulator used to program the output voltage — connect to an external resis-
FB
tor divider from VOUT to AGND.
VOUT
Switcher output voltage sense pin.
3
4, 30, PAD 1
5
6, 9-11,
PAD 2
7
8
12
13
23-25, PAD 3
14
15-22
26
27
28
29
31
32
VDD
AGND
VLDO
Bias supply for the IC.
Analog ground
LDO output. Connect to VDD when using the internal LDO as a bias power supply.
VIN
SS
BST
DH
LXBST
LX
DL
PGND
PGOOD
ILIM
LXS
EN
TON
ENL
Input supply voltage
The soft-start ramp will be programmed by an internal current source charging a capacitor on this pin.
Bootstrap pin — connect a capacitor of at least 100nF from BST to LXBST to develop the floating supply for
the high-side gate drive.
High-side gate drive
LX Boost — connect to the BST capacitor.
Switching (phase) node
Low-side gate drive
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Power ground
Open-drain power good indicator — high impedance indicates power is good. An external pull-up
resistor is required.
Current limit sense pin — used to program the current limit by connecting a resistor from ILIM to LXS.
LX sense — connects to R
ILIM
Enable input for the switching regulator — connect to AGND to disable the switching regulator, connect to
VDD or float to operate in forced continuous mode.
On-time programming input — set the on-time by connecting through a resistor to AGND
Enable input for the LDO — connect ENL to AGND to disable the LDO. Drive with logic signal for logic con-
trol, or program the VIN UVLO with a resistor divider between VIN, ENL, and AGND.
11
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet SC9301.PDF ] | |
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