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参数资料
型号： LTC3589IUJ#PBF
厂商： LINEAR TECHNOLOGY CORP
元件分类： 稳压器
英文描述： SWITCHING REGULATOR, 2600 kHz SWITCHING FREQ-MAX, PQCC40
封装： 6 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-40
文件页数： 14/46页
文件大小： 570K
代理商： LTC3589IUJ#PBF
LTC3589/LTC3589-1
21
3589fc
Table 5. Step-Down Switching Regulator 1 Command Register
Settings
COMMAND
REGISTER[BIT]
VALUE
SETTING
SCR1[1-0]
00*
01
10
Pulse-Skipping Mode
Burst Mode Operation
Forced Continuous Mode
OVEN[0]
0*
1
Disable
Enable
SCR2[0]
0*
1
Wait for Output Below 300mV Before Enable
Enable Immediately
VCCR[1]
0*
1
Select Register B1DTV1 (V1) Reference
Select Register B1DTV2 (V2) Reference
VCCR[0]
1
Initiate Dynamic Voltage Slew
VRRCR[1-0]
00
01
10
11*
Reference Slew Rate = 0.88mV/μs
Reference Slew Rate = 1.75mV/μs
Reference Slew Rate = 3.5mV/μs
Reference Slew Rate = 7mV/μs
B1DTV1[5]
0*
1
Force PGOOD Low When Slewing
Normal PGOOD Operation When Slewing
B1DTV1[4-0]
11001*
DAC Dynamic Target Voltage V1
B1DTV2[4-0]
11001*
DAC Dynamic Target Voltage V2
B1DTV2[5]
0*
1
2.25MHz Switching Frequency
1.125MHz Switching Frequency
B1DTV2[6]
0*
1
Switch on Clock Phase 1
Switch on Clock Phase 2
B1DTV2[7]
0*
1
Shutdown Regulator 1 Normally
Keep Regulator 1 Alive
* Denotes Default Power-On Value
Soft-Start
Soft-start is accomplished by gradually increasing the
input reference voltage on each step-down switching
regulator from 0V to the dynamic reference DAC output
level at a rate of 0.8V/ms. This allows each output to
rise slowly, helping minimize inrush current required to
charge up the regulator output capacitor. A soft-start cycle
occurs whenever a regulator is enabled either initially or
while powering up following a fault condition. A soft-start
cycle is not triggered by a change of operating modes or
a dynamic voltage slew. During soft-start the converter is
forced to pulse-skipping mode regardless of the settings
in the SCR1 command register.
OPERATION
Table 6. Step-Down Switching Regulator 2 Command Register
Settings
COMMAND
REGISTER[BIT]
VALUE
SETTING
SCR1[3-2]
00*
01
10
Pulse-Skipping Mode
Burst Mode Operation
Forced Continuous Mode
OVEN[1]
0*
1
Disable
Enable
SCR2[1]
0*
1
Wait for Output Below 300mV Before Enable
Enable immediately
VCCR[3]
0*
1
Select Register B2DTV1 (V1) Reference
Select Register B2DTV2 (V2) Reference
VCCR[2]
1
Initiate Dynamic Voltage Slew
VRRCR[3-2]
00
01
10
11*
Reference Slew Rate = 0.88mV/μs
Reference Slew Rate = 1.75mV/μs
Reference Slew Rate = 3.5mV/μs
Reference Slew Rate = 7mV/μs
B2DTV1[5]
0*
1
Force PGOOD Low When Slewing
Normal PGOOD Operation When Slewing
B2DTV1[4-0]
11001*
DAC Dynamic Target Voltage V1
B2DTV2[4-0]
11001*
DAC Dynamic Target Voltage V2
B2DTV2[5]
0*
1
2.25MHz Switching Frequency
1.125MHz Switching Frequency
B2DTV2[6]
0*
1
Switch on Clock Phase 1
Switch on Clock Phase 2
B2DTV2[7]
0*
1
Shutdown Regulator 2 Normally
Keep Regulator 2 Alive
* Denotes Default Power-On Value
Switching EMI Control
The step-down switching regulators contain new pat-
ent pending circuitry to limit the edge rate of the switch
nodes SW1, SW2, and SW3. This new circuitry controls
the transition of the switch node over a period of a few
nanoseconds, signicantly reducing radiated EMI and
conducted supply noise while maintaining high efciency.
Since slowing the slew rate of the switch nodes causes
efciency loss, the slew rate of the step-down switching
regulators is adjustable using the I2C command register
B1DTV1 bits 6 and 7. Optimize efciency or EMI as neces-
sary with four different slew rate settings. The power-on
default is the fastest slew rate, highest efciency setting.
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