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SC4607 PDF даташит

Спецификация SC4607 изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «High Efficiency Synchronous Buck».

Детали детали

Номер произв SC4607
Описание High Efficiency Synchronous Buck
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC4607 Даташит, Описание, Даташиты
POWER MANAGEMENT
Description
SC4607
Very Low Input, MHz Operation,
High Efficiency Synchronous Buck
Features
The SC4607 is a voltage mode step down (buck) regula-
tor controller that provides accurate high efficiency power
conversion from an input supply range of 2.25V to 5.5V.
The SC4607 is capable of producing an output voltage
as low as 0.5V and has a maximum duty cycle of 97%. A
high level of integration reduces external component
count, and makes it suitable for low voltage applications
where cost, size, and efficiency are critical.
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The SC4607 drives external, N-channel MOSFETs with a
peak gate current of 1A. The SC4607 prevents shoot
through currents by offering nonoverlap protection for
the gate drive signals of the external MOSFETs. The
SC4607 features lossless current sensing of the voltage
drop across the drain to source resistance of the high
side MOSFET during its conduction period.
‹ Asynchronous start up
‹ BiCMOS voltage mode PWM controller
‹ Operation of frequency to 1MHz
‹ 2.25V to 5.5V input voltage range
‹ Output voltages as low as 0.5V
‹ +/-1% reference accuracy
‹ Sleep mode (Icc = 10µA typ)
‹ Adjustable lossless short circuit current limiting
‹ Combination pulse by pulse & hiccup mode
current limit
‹ High efficiency synchronous switching
‹ Up to 97% duty cycle
‹ 1A peak current driver
‹ 10-pin MSOP package
Applications
The quiescent supply current in sleep mode is typically
lower than 10µA. A 1.2ms soft start is internally provided
to prevent output voltage overshoot during start-up.
The SC4607 is an ideal choice for converting 2.5V, 3.3V,
5V or other low input supply voltages. It’s available in 10
pin MSOP package
‹ Distributed power architecture
‹ Servers/workstations
‹ Local microprocessor core power supplies
‹ DSP and I/O power supplies
‹ Battery-powered applications
‹ Telecommunications equipment
‹ Data processing applications
Typical Application Circuit
R3 C14
0.1u
C1 C2 2.2n
180p
R1
14.3k
R13
1
C3
4.7u
C20
560pF
D2
1u
C71
U1
1 BST
DRVH
2 VCC
PHASE
3 ISET
DRVL
4 COMP
GND
5 FS/SYNC VSENSE
SC4607
10
9
8
7
6
R6
0
R5
0
Vin = 2.25V - 5.5V
C10 C11
C12
220u 22u 22u
M1
L1
1.8u
M2
Vout = 1.5V (as low as 0.5V * ) / 12A
C6
330u
C5 C4 C9
22u 22u 4.7n R7
10k
R8
200
*External components can be modified to provide a Vout as low as 0.5V
R9
4.99k
Revision: June 1, 2005
1
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SC4607 Даташит, Описание, Даташиты
SC4607
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 (DRVH, DRVL) Currents
Continuous
Peak
Inputs (VSENSE, COMP, FS/SYNC, ISET)
7
+/-0.25
+/-1.00
-0.3 to 7
V
A
A
V
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13 V
PHASE
-0.3 to 7.5
V
PHASE Pulse tpulse < 50ns
-2 to 7.5
V
Operating Ambient Temperature Range
TA -40 to +85 °C
Storage Temperature Range
TSTG -65 to +150
°C
Junction Temperature
TJ -55 to +150 °C
Lead Temperature (Soldering) 10 Sec.
TLEAD
+300
°C
ESD Rating (Human Body Model)
ESD
4
kV
All voltages with respect to GND. Currents are positive into, negative out of the specified terminal.
Electrical Characteristics
Unless otherwise specified, VCC = 3.3V, CT = 270pF, TA = -40°C to 85°C, TA=TJ
Parameter
Test Conditions
Min Typ Max Unit
Overall
Supply Voltage
5.5 V
Supply Current, Sleep
FS/SYNC = 0V
10 15 µA
Supply Current, Operating
VCC Turn-on Threshold
VCC Turn-off Hysteresis
VCC = 5.5V
TA = 25°C
TA = -40°C to 85°C
2 3.5
2.05
2.2
2.25
100
mA
V
mV
Error Amplifier
VSENSE Input Voltage
(Internal Reference)
VSENSE Bias Current
TA = 25°C
VCC = 2.25V - 5.5V, TA = 25°C
TA = -40°C to 85°C
0.495
0.4925
0.4915
0.5 0.505
0.5 0.5075
0.5085
200
V
nA
Open Loop Gain (1)
Unity Gain Bandwidth (1)
VCOMP = 0.5 to 2.5V
80 90
8
dB
MHz
Slew Rate (1)
2005 Semtech Corp.
2.4 V/µs
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SC4607 Даташит, Описание, Даташиты
SC4607
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless otherwise specified, VCC = 3.3V, CT = 270pF, TA = -40°C to 85°C, TA=TJ
Parameter
Test Conditions
Min Typ
Error Amplifier (Cont.)
VOUT High
VOUT Low
Oscillator
ICOMP = -5.5mA
ICOMP = 5.5mA
VCC - 0.5
VCC - 0.3
0.3
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Voltage Stability
Temperature Coefficient
Minimum Operation Frequency (1)
TA = 25°C
TA = 25°C, VCC = 2.25V to 5.5V
TA = -40°C to 85°C
525 575
0.5
0.02
50
Maximum Operation Frequency (1)
Ramp Peak to Valley
1
Ramp Peak Voltage
1.3
Ramp Valley Voltage
0.3
Sleep, Soft Start, Current Limit
Sleep Threshold
Measured at FS
Sleep Input Bias Current
Soft Start Time (1)
ISET Bias Current
Temperature Coefficient of ISET
VSYNC = 0V
FSW = 575 KHz
TJ = 25°C
-1
1.2
-45 -50
0.28
Current Limit Blank Time (1)
130
Gate Drive
Duty Cycle
Pull-Up Resistance (DRVH) (2)
Pull-Down Resistance (DRVH) (2)
Pull-Up Resistance (DRVL) (1)
Pull-Down Resistance (DRVL) (2)
Output Rise Time
Output Fall Time
Minimum Non-Overlap (1)
Notes:
(1). Guaranteed by design.
(2). Guaranteed by characterization.
2005 Semtech Corp.
VBST - VPHASE = 3.3V, ISOURCE = -100mA
VBST - VPHASE = 3.3V, ISINK = 100mA
VCC = 3.3V, ISOURCE = -100mA
VCC = 3.3V, ISINK = 100mA
VCC = 3.3V, COUT = 4.7nF
VCC = 3.3V, COUT = 4.7nF
3
2.7
2.4
2.2
1.5
35
27
40
Max Unit
V
0.45
625 kHz
%/V
%/°C
kHz
1M Hz
V
V
V
75 mV
µA
ms
-55 µA
%/°C
ns
97 %
ns
ns
ns
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