LTC3589HUJ#PBF Linear Technology, LTC3589HUJ#PBF Datasheet - Page 13

• Manufacturer Part Number: LTC3589HUJ#PBF
• Description: IC DC/DC CONV 8-OUTPUT 40QFN
• Manufacturer: Linear Technology

Specifications of LTC3589HUJ#PBF

• Applications: Handheld/Mobile Devices
• Current - Supply: 8µA
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: *
• Primary Input Voltage: 5.5V
• No. Of Outputs: 8
• Output Voltage: 5V
• Output Current: 1.6A
• No. Of Pins: 40
• Operating Temperature Range: -40°C To +150°C
• Msl: MSL 1 - Unlimited
• No. Of Ldo Regulators: 3
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIN FUNCTIONS
V
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 I
bypassed to ground with a 1μF or greater ceramic capacitor.
LDO3 (Pin 3): Output Voltage of LDO3. Nominal output
voltage is fi 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 I
ground with a 1μF or greater ceramic capacitor.
V
pin should be bypassed to ground with a 1μF or greater
ceramic capacitor.
PV
Regulator 1. Tie this pin to V
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 fl 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
fl 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
fl oating.
IN_LDO2
IN_LDO34
IN1
2
C register controlled DAC reference. This pin must be
(Pin 6): Power Input for Step-Down Switching
(Pin 1): Power Input for LDO2. This pin should be
(Pin 5): Power Input for LDO3 and LDO4. This
2
C port. This pin must be bypassed to
IN
supply. This pin should
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
fl 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
fl oating.
PV
Tie this pin to V
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 I
EN_LDO34 (Pin 18): LTC3589 Enable LDO3 and LDO4 Logic
Input. Active high to enable LDO3 and LDO4. Disable LDO4
via I
OVEN or L2DTV2. A weak pull-down forces EN_LDO34
low when left fl 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 fl 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 fi 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.
IN4
2
C software commands using I
(Pin 15): Power Input for Switching Regulator 4.
IN
LTC3589/LTC3589-1
supply. This pin should be bypassed to
2
C CLIRQ command register.
2
C command registers
13
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