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参数资料
| 型号： | LTC3589IUJ-1#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： | 11/46页 |
| 文件大小： | 570K |
| 代理商： | LTC3589IUJ-1#PBF |
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LTC3589/LTC3589-1
19
3589fc
LDO Regulator 3
LDO3 is a xed 1.8V or 2.8V (LTC3589-1) output regula-
tor. LDO3 is enabled by driving pin EN_LDO34 high or by
writing command register OVEN[5] to 1.
Table 3 shows the I2C command register settings used
to control LDO3.
Table 3. LDO 3 Command Register Settings
COMMAND
REGISTER[BIT]
VALUE
SETTING
OVEN[5]
0*
1
Disable
Enable
SCR2[5]
0*
1
Wait for Output Below 300mV Before Enable
Enable Immediately
* Denotes Default Power-On Value
LDO Regulator 4
LDO4 has four output voltage options that are controlled
by the contents of command register bits L2DTV2[6]
and L2DTV2[5]. When pin EN_LDO34 is low, LDO3 and
LDO4 are controlled by writing to command register bits
OVEN[5] and OVEN[6] respectively. By default, the LTC3589
pin EN_LDO34 enables and disables LDO3 and LDO4 si-
multaneously when command register bits OVEN[5] and
OVEN[6] are low. When command register bit L2DTV2[7] is
high, control of LDO4 is disconnected from pin EN_LDO34
and controlled by command register bit OVEN[6] regardless
of the status of EN_LDO34. The LTC3589-1 pin EN_LDO3
enables only LDO3. Control of LDO4 on the LTC3589-1 is
under I2C control only. Table 4 shows the I2C command
register settings that control LDO4.
OPERATION
Figure 3. Step-Down Switching Regulator
Application Circuit
3589 F03
PVIN
PWM
CONTROL
0.3625V
TO 0.75V
SW
FB
L1
EN
MODE
R1
COUT
R2
CFB
DAC
5
Table 4. LTC3589 Command Register Settings
COMMAND
REGISTER[BIT]
VALUE
SETTING
OVEN[6]
0*
1
Disable
Enable
SCR2[6]
0*
1
Wait for Output Below 300mV Before Enable
Enable Immediately
L2DTV2[6-5]
00*
01
10
11
VLDO4 = 2.8V
VLDO4 = 2.5V
VLDO4 = 1.8V
VLDO4 = 3.3V
L2DTV2[7]
0*
1
LDO4 Enable Controlled by EN_LDO34
LDO4 Enable Controlled by OVEN[6]
LTC3589-1 Command Register Settings
OVEN[6]
0*
1
Disable
Enable
SCR2[6]
0*
1
Wait for Output Below 300mV Before Enable
Enable Immediately
L2DTV2[6-5]
00*
01
10
11
VLDO4 = 1.2V
VLDO4 = 1.8V
VLDO4 = 2.5V
VLDO4 = 3.2V
L2DTV2[7]
0*
1
Unused
* Denotes Default Power-On Value
STEP-DOWN SWITCHING REGULATORS
Output Voltage Programming
Each of the step-down converters uses a dynamically
slewing DAC output for its reference. The full-scale output
voltage is set by using a resistor divider connected from
the step-down switching regulator output to the feedback
pins (B1_FB, B2_FB, and B3_FB), as shown in Figure 3.
Set the output voltage of step-down switching regulators
using the following formula:
VOUT = 1+
R1
R2
(0.3625+BxDTVx 0.0125)(V)
BxDTVx is the decimal value of the ve bit binary number
in the I2C BxDTV1 or BxDTV2 command registers. BxDTV1
and BxDTV2 default to 11001 to output a reference voltage
of 0.675V. Typical values for R1 are in the range of 40k
to 1M. The capacitor CFB cancels the pole created by the
feedback resistors and the input capacitance on the FB pin
and also helps to improve load step transient response.
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