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LTM2987 Datasheet(PDF) 18 Page - Analog Devices

Part # LTM2987
Description  2-Channel 짹60V Power System Manager
PDF  114 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTM2987 Datasheet(HTML) 18 Page - Analog Devices

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LTC2971
18
Rev. 0
For more information www.analog.com
PIN FUNCTIONS
PIN NAME
PIN NUMBER
PIN TYPE
DESCRIPTION
VOUT_SNS0
A2
In
DC/DC Converter Differential Output Voltage-0 Sensing Pin
GNDSNS0
A1
In
DC/DC Converter Differential Output Voltage-0 Ground Sensing Pin
VOUT_EN0
C1
Out
DC/DC Converter Enable-0 Pin
VOUT_EN1
B1
Out
DC/DC Converter Enable-1 Pin
AUXFAULTB
D1
Out
Auxiliary Fault Output Pin. Can be configured to pull low when OV/UV detected.
DNC
B6
Do Not Connect Do Not Connect. Leave this pin floating.
VIN_SNS
G1
In
VIN Sense Input. This voltage is compared against the VIN On and Off voltage thresholds in order to
determine when to enable and disable, respectively, the downstream DC/DC converters.
VPWR
G2
In
VPWR Serves as the Unregulated Power Supply Input to the Chip. If a 4.5V to 60V supply voltage is
unavailable, short VPWR to VDD33 and power the chip directly from a 3.3V supply. Bypass to GND
with a 0.1µF capacitor.
VDD33
D2
In/Out
If shorted to VPWR, It serves as 3.13 to 3.47V supply input pin. Otherwise it is a 3.3V internally
regulated voltage output. If using the internal regulator to provide VDD33, do not connect to VDD33
pins of any other devices. Bypass to GND with a 0.1μF capacitor.
VDD33
E2
In
Input for Internal 2.5V Sub-Regulator. Short this pin to pin D2. If using the internal regulator to
provide VDD33, do not connect to VDD33 pins of any other devices.
VDD25
D3
In/Out
2.5V Internally Regulated Voltage Output. Bypass to GND with a 0.1µF capacitor. Do not connect to
VDD25 pins of any other devices.
VDD25
E3
In
2.5V Supply Voltage Input. Short this pin to pin D3. Do not connect to VDD25 pins of any
other devices.
TSENSE0
F3
In/Out
External Temperature Current Output and Voltage Input for Channel 0. Maximum allowed
capacitance is 1µF.
TSENSE1
F2
In/Out
External Temperature Current Output and Voltage Input for Channel 1. Maximum allowed
capacitance is 1µF.
PWRGD
G3
Out
Power-Good Open Drain Output. Indicates when selected outputs are power good. Can be used as
system power-on reset.
SHARE_CLK
G4
In/Out
Bidirectional Clock Sharing Pin. Connect a 5.49kΩ pull-up resistor to VDD33. Connect to all other
SHARE_CLK pins in the system.
PG0
G5
In/Out
Configurable Open-Drain Output and Digital Input for Channel 0. Connect a 10kΩ pull-up resistor
to VDDIO.
PG1
G6
In/Out
Configurable Open-Drain Output and Digital Input for Channel 1. Connect a 10kΩ pull-up resistor
to VDDIO .
WDI/RESETB
F5
In
Watchdog Timer Interrupt and Chip Reset Input. Connect a 10kΩ pull-up resistor to VDD33. Rising
edge resets watchdog counter. Holding this pin low for more than tRESETB resets the chip.
FAULTB0
F6
In/Out
Open-Drain Output and Digital Input. Active Low Bidirectional Fault Indicator-0. Connect a 10kΩ
pull-up resistor to VDDIO.
FAULTB1
G7
In/Out
Open-Drain Output and Digital Input. Active Low Bidirectional Fault Indicator-1. Connect a 10kΩ
pull-up resistor to VDDIO.
WP
F4
In
Digital Input. Active High Write-Protect Input Pin
SDA
E6
In/Out
PMBus Bidirectional Serial Data Pin
SCL
F7
In
PMBus Serial Clock Input Pin (400kHz Maximum)
ALERTB
E5
Out
Open-Drain Output. Generates an interrupt request in a fault/warning situation.
CONTROL0
E7
In
Control Pin 0 Input
CONTROL1
D7
In
Control Pin 1 Input
VDDIO
C7
In
Sets the Input Threshold of all digital inputs, except SHARE_CLK, ASEL[1:0], VOUT_EN[1:0] and
AUXFAULTB, to approximately 45% of VDDIO. Connect to a supply voltage between 1.62V and 3.6V.
Connect all of the LTC2971 pins pull-up resistors to this pin except WDI/RESETB, SHARE_CLK and
VOUT_EN[1:0]. Connect these pins pull-up resistors to VDD33.



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