SMB113A Datasheet, PDF (6/32 Pages) Summit Microelectronics, Inc. – High-power, Four-channel Programmable DC-DC System Power Managers

SMB113A/B/SMB117/A
Preliminary Information
PIN DESCRIPTION
Pin Number Pin Type
14
IN
15
CAP
16
PWR
17
OUT
18
PWR
19
OUT
20
IN
21
IN
22
IN
23
OUT
24
PWR
25
OUT
26
IN
27
IN
28
IN
Pin Name
VM_CH1
VDD_CAP
VBATT
LSDRV_CH2
HVSUP2
HSDRV_CH2
COMP2_CH2
COMP1_CH2
VM_CH2
LSDRV_CH3
HVSUP3
HSDRV_CH3
PWREN
COMP2_CH3
COMP1_CH3
Pin Description
The VM_CH1 (Channel 1 Voltage Monitor) pin connects the channel 1
step-down controller output. Internally the VM_CH1 pin connects to an
internal programmable resistor divider.
The VDD_CAP (VDD Capacitor) pin is an external capacitor input used
to filter the internal supply.
Power supply to part.
The LSDRV_CH2 (Channel 2 Low-side Driver) pin is the lower
switching node of the channel 2 synchronous step-down buck
controller. Attaches to the gate of n-channel MOSFET.
Channel 2 High Voltage Supply for Channel 2 buck driver.
The HSDRV_CH2 (Channel 2 High-side Driver) pin is the upper
switching node of the channel 2 synchronous step-down buck
controller. Attach to the gate of p-channel MOSFET. A delay exists
between the assertion of HSDRV_CH2 and assertion of LSDRV_CH2
to prevent excessive current flow during switching.
The COMP2_CH2 (Channel 2 secondary Compensation) pin is the
secondary compensation input of the channel 2 step-down buck
controller.
The COMP1_CH2 (Channel 2 primary Compensation) pin is the
primary compensation input of the channel 2 step-down buck
controller. Each pin is internally connected to a programmable resistor
divider.
The VM_CH2 (Channel 2 Voltage Monitor) pin connects the channel 6
step-down controller output. Internally the VM_CH2 pin connects to an
internal programmable resistor divider.
The LSDRV_CH3 (Channel 3 Low-side Driver) pin is the lower
switching node of the channel 3 synchronous step-down buck
controller. Attaches to the gate of n-channel MOSFET.
Channel 3 High Voltage Supply for Channel 3 buck driver.
The HSDRV_CH3 (Channel 3 High-side Driver) pin is the upper
switching node of the channel 3 synchronous step-down buck
controller. Attach to the gate of p-channel MOSFET. A delay exists
between the assertion of HSDRV_CH3 and assertion of LSDRV_CH3
to prevent excessive current flow during switching.
The PWREN (Power Enable) pin is a programmable input used to
enable (disable) selected supplies. This pin can also be programmed
to latch and act as a debounced, manual push button input. Active high
when level triggered, active low when used as a push- button input.
When unused this pin should be tied to a solid logic level.
The COMP2_CH3 (Channel 3 secondary Compensation) pin is the
secondary compensation input of the channel 3 step-down buck
controller.
The COMP1_CH3 (Channel 3 primary Compensation) pin is the
primary compensation input of the channel 3 step-down buck
controller. Each pin is internally connected to a programmable resistor
divider.
Summit Microelectronics, Inc
2111 2.4 6/24/2008
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