SMB113A/B/SMB117/A
Preliminary Information
PIN DESCRIPTION
Pin Number Pin Type
Pin Name
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.
14
IN
VM_CH1
The VDD_CAP (VDD Capacitor) pin is an external capacitor input used
to filter the internal supply.
15
16
CAP
VDD_CAP
VBATT
PWR
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.
17
18
OUT
LSDRV_CH2
HVSUP2
PWR
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.
19
OUT
HSDRV_CH2
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.
20
21
22
IN
IN
IN
COMP2_CH2
COMP1_CH2
VM_CH2
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.
23
24
OUT
LSDRV_CH3
HVSUP3
PWR
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.
25
26
OUT
IN
HSDRV_CH3
PWREN
27
28
IN
IN
COMP2_CH3
COMP1_CH3
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 2.6 9/16/2010
6
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