SC4601 PDF даташит
Спецификация SC4601 изготовлена «Semtech Corporation» и имеет функцию, называемую «Step Down Controller». |
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Детали детали
Номер произв | SC4601 |
Описание | Step Down Controller |
Производители | Semtech Corporation |
логотип |
18 Pages
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POWER MANAGEMENT
SC4601
Low Input, High Efficiency
Synchronous, Step Down Controller
Description
Features
The SC4601 is a voltage mode step down (buck) regula-
tor controller that provides accurate high efficiency power
conversion from input supply range 2.75V to 5.5V. A high
level of integration reduces external component count
and makes it suitable for low voltage applications where
cost, size and efficiency are critical.
The SC4601 drives external complementary power
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eliminates the need for an external charge pump and
simplifies the high side gate driver. Non-overlap protec-
tion is provided for the gate drive signals to prevent shoot
through of the MOSFET pair. The voltage drop across the
P-channel MOSFET during its conduction is sensed for
lossless short circuit current limiting.
Programmable switching frequency up to 600KHz
BICMOS voltage mode PWM controller
2.75V to 5.5V Input voltage range
Output voltage as low as 0.8V
+/-1% Reference accuracy
Sleep mode (Icc = 10µA typ)
Lossless adjustable overcurrent protection
Combination pulse by pulse & hiccup mode
current limit
High efficiency synchronous switching
Up to 100% Duty cycle range
Synchronization to external clock
10-Pin MSOP surface mount package. Available in
Lead-free package, fully WEEE and RoHS compliant
Applications
A low power sleep mode can be achieved by forcing the
SYNC/SLEEP pin below 0.8V. A synchronous mode of op-
eration is activated as the SYNC/SLEEP pin is driven by
an external clock. The quiescent supply current in sleep
mode is typically lower than 10µA. A 2.4ms soft start is
internally provided to prevent output voltage overshoot
during start-up. A 100% maximum duty cycle allows the
SC4601 to operate as a low dropout regulator in the
event of a low battery condition. Its switching frequency
can be programmed up to 600KHz.
Distributed power architecture
Servers/workstations
Local microprocessor core power supplies
DSP and I/O power supplies
Battery powered applications
Telecommunication equipment
Data processing applications
The SC4601 is an ideal choice for 3.3V, 5V or other low
input supply systems. It’s available in 10 pin MSOP
package.
Typical Application Circuit
RT
30.1K
C3 4.7u
C1 470p
R1 C2
5.11K 6.8n
R15
1
U1
5 FS
1 VCC
2 SYNC
3 COMP
4 VSENSE
R3
ISET
PDRV
PHASE
NDRV
GND
6
10
7
9
8
SC4601
C14
33n
R6
1.0
R5
1.0
M1
M2
Vin = 2.75V ~ 5.5V
C10 C11
C12 C13
22u 22u
22u 22u
L1 Vout = 1.5V (as low as 0.5V * ) /6A
1.6u
C7
150u
C4
22u
C9
3.9n
R7
4.53k
R8
147
* External components can be modified to provide a VOUT as low as 0.8V.
Revision: February 22, 2006
1
R9
5.11k
www.semtech.com
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SC4601
POWER MANAGEMENT
Absolute Maximum Ratings
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 implied.
Parameter
Symbol
Maximum
Units
Supply Voltage (VCC)
Output Drivers (PDRV, NDRV) Currents Continuous
7
±0.25
Inputs (VSENSE, COMP, SYNC/SLEEP, FS, ISET)
-0.3 to 7
Phase
-0.3 to 7
www.DataSPheheat4sUe.cPoumlse tpulse < 50ns
-2 to 7
Operating Ambient Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Thermal Impedance Junction to Case
Thermal Impedance Junction to Ambient
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human Body Model)
TA
TSTG
TJ
θJC
θJA
TLEAD
ESD
-40 to +85
-65 to +150
+150
41.9
206
+300
2
All voltages are with respect to GND. Currents are positive into, negative out of the specified terminal.
Electrical Characteristics
Unless otherwise specified, VCC = 3.3V, RT = 59Kohm, TA = -40°C to 85°C, TA = TJ.
Parameter
Test Conditions
Min
Typ
Max
V
A
V
V
V
°C
°C
°C
°C/W
°C/W
°C
kV
Unit
Overall
Supply Voltage
Supply Current, Sleep
Supply Current, Operating
VCC Turn-on Threshold
VCC Turn-off Hysteresis
Error Amplifier
Internal Reference
VSENSE Bias Current
Open Loop Gain (1)
Unity Gain Bandwidth (1)
Slew Rate (1)
VSYNC/SLEEP = 0V
TA = 25°C
VCC = 2.75V to 5.5V, TA = 25°C
Temperature
VCOMP = 0.4V to 1.8V
2.75 5.5
10 15
1.5 3
2.55 2.75
150
V
µA
mA
V
mV
0.792
0.788
0.786
70
0.8 0.808
0.8 0.812
V
0.8 0.814
25 nA
80 dB
4 MHz
2 V/µs
2006 Semtech Corp.
2
www.semtech.com
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SC4601
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless otherwise specified, VCC = 3.3V, RT = 59Kohm, TA = -40°C to 85°C, TA = TJ.
Parameter
Test Conditions
Error Amplifier (Cont.)
VCOMP High
VCOMP Low
Oscillator
ICOMP = -2mA
ICOMP = 2mA
www.DataSIhneiteiat4lUA.ccocmuracy
Minimum Operation Frequency (1)
TA = 25°C, VSYNC/SLEEP = HIGH
Maximum Operation Frequency (1)
SYNC/SLEEP Low Threshold
SYNC/SLEEP High Threshold
Ramp Peak to Valley (1)
VIN ≤ 3.6V
VIN ≤ 3.6V
Ramp Peak Voltage (1)
Ramp Valley Voltage (1)
Sleep, Soft Start, Current Limit
Sleep Input Bias Current
VSYNC/SLEEP = 0V
Soft Start Time (1)
Current Limit Threshold
Bias Current, TJ = 25°C
Temperature Coefficient
Current Limit Blank Time (1)
N-Channel and P-Channel Driver Outputs
Pull Up Resistance (PDRV) (2)
Pull Down Resistance (PDRV) (2)
Pull Up Resistance (NDRV) (2)
Pull Down Resistance (NDRV) (2)
PDRV Output Rise Time (1)
PDRV Output Fall Time (1)
Vcc = 3.3V, IOUT = -100mA (source)
Vcc = 3.3V, IOUT = 50mA (sink)
Vcc = 3.3V, IOUT = -100mA (source)
Vcc = 3.3V, IOUT = 100mA (sink)
Vgs = 3.3V, COUT = 1.0nF
Vgs = 3.3V, COUT = 1.0nF
Min Typ Max
2.8 3.1
0.15 0.3
260 300 340
100
600
0.8
2.0
1.3 1.5 1.7
1.85 1.9
0.3 0.35
-1
2.4
-43 -50 -57
0.15
150
3
3
3
3
9
12
Unit
V
V
kHz
kHz
kHz
V
V
V
V
V
µA
ms
µA
%/°C
ns
ohms
ohms
ohms
ohms
ns
ns
2006 Semtech Corp.
3
www.semtech.com
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