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参数资料
| 型号： | LTC3589EUJ#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： | 5/46页 |
| 文件大小： | 570K |
| 代理商： | LTC3589EUJ#PBF |
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LTC3589/LTC3589-1
13
3589fc
PIN FUNCTIONS
VIN_LDO2 (Pin 1): Power Input for LDO2. This pin should be
bypassed to ground with a 1μF or greater ceramic capacitor.
LDO2 (Pin 2): Output Voltage of LDO2. Nominal output
voltage is set with a resistor feedback divider that servos to
an I2C register controlled DAC reference. This pin must be
bypassed to ground with a 1μF or greater ceramic capacitor.
LDO3 (Pin 3): Output Voltage of LDO3. Nominal output
voltage is xed at 1.8V or 2.8V (LTC3589-1). This pin
must be bypassed to ground with a 1μF or greater ceramic
capacitor.
LDO4 (Pin 4): Output Voltage of LDO4. Output voltage is
selected via the I2C port. This pin must be bypassed to
ground with a 1μF or greater ceramic capacitor.
VIN_LDO34 (Pin 5): Power Input for LDO3 and LDO4. This
pin should be bypassed to ground with a 1μF or greater
ceramic capacitor.
PVIN1 (Pin 6): Power Input for Step-Down Switching
Regulator 1. Tie this pin to VIN supply. This pin should
be bypassed to ground with a 4.7μF or greater ceramic
capacitor.
SW1 (Pin 7): Switch Pin for Step-Down Switching
Regulator 1. Connect one side of step-down switching
regulator 1 inductor to this pin.
RSTO (Pin 8): Reset Output. Open-drain output pulls low
when the always-on regulator LDO1 is below regulation
and during a hard reset initiated by a pushbutton input.
EN_LDO2 (Pin 9): Enable LDO2 Logic Input. Active high
input to enable LDO2. A weak pull-down forces EN_LDO2
low when left oating.
EN1 (Pin 10): Enable Step-Down Switching Regulator 1.
Active high input to enable step-down switching
regulator 1. A weak pull-down forces EN1 low when left
oating.
EN2 (Pin 11): Enable Step-Down Switching Regulator 2.
Active high input to enable step-down switching
regulator 2. A weak pull-down forces EN2 low when left
oating.
SW4AB (Pin 12): Switch Pin for Buck-Boost Switching
Regulator 4. Connected to the buck-boost internal power
switches A and B. Connect an inductor between this pin
and SW4CD (Pin 19).
EN3 (Pin 13): Enable Step-Down Switching Regulator 3.
Active high input to enable step-down switching
regulator 3. A weak pull-down forces EN3 low when left
oating.
EN4 (Pin 14): Enable Buck-Boost Switching Regulator 4.
Active high input to enable buck-boost switching
regulator 4. A weak pull-down forces EN4 low when left
oating.
PVIN4 (Pin 15): Power Input for Switching Regulator 4.
Tie this pin to VIN supply. This pin should be bypassed to
ground with a 4.7μF or greater ceramic capacitor.
BB_OUT (Pin 16): Output Voltage of Buck-Boost Switching
Regulator 4. This pin must be bypassed to ground with a
22μF or greater ceramic capacitor.
IRQ (Pin 17): Interrupt Request Output. Open-drain
driver is pulled low for power good, undervoltage, and
overtemperature warning and fault conditions. Clear IRQ
by writing to the I2C CLIRQ command register.
EN_LDO34 (Pin18):LTC3589EnableLDO3andLDO4Logic
Input. Active high to enable LDO3 and LDO4. Disable LDO4
via I2C software commands using I2C command registers
OVEN or L2DTV2. A weak pull-down forces EN_LDO34
low when left oating.
EN_LDO3 (Pin 18): LTC3589-1 Enable LDO3 Logic Input.
Active high to enable LDO3. A weak pull-down forces
EN_LDO3 low when left oating.
SW4CD (Pin 19): Switch Pin for Buck-Boost Switching
Regulator 4. Connected to the buck-boost internal power
switches C and D. Connect an inductor between this node
and SW4AB (Pin 12).
PWR_ON (Pin 20): External Power-On. Handshaking pin
to acknowledge successful power-on sequence. PWR_ON
must be driven high within ve seconds of WAKE going
high to keep power on. It can be used to activate the WAKE
output by driving high. Drive low to shut down WAKE.
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