SMB214A Datasheet, PDF (6/26 Pages) Summit Microelectronics, Inc. – High-power, Three-channel Programmable DC-DC System Power Managers

SMB214A/B/C
PIN DESCRIPTION
Pin Number Pin Type
14
IN
15
CAP
16
PWR
17
OUT
18
PWR
19
OUT
20
IN
21
IN
22
IN
26
IN
30
31
32
PAD
23, 24, 25,
27, 28, 29
PWR
OUT
PWR
PWR
N/C
Pin Name
VM_CH1
VDD_CAP
VBATT
LSDRV_CH2
HVSUP2
HSDRV_CH2
COMP2_CH2
COMP1_CH2
VM_CH2
PWREN
GND
LSDRV_CH0
HVSUP0
GND
N/C
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 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.
Ground
The LSDRV_CH0 (Channel 0 Low-side Driver) pin is the lower
switching node of the channel 0 synchronous step-down buck
controller. Attach to the gate of n-channel MOSFET.
Channel 0 High Voltage Supply used to power the channel 0 buck
driver.
Exposed metal (thermal) Pad on bottom of SMB214A/B/C. The thermal
pad of the QFN package must be connected to the PCB GND.
No Connect
Summit Microelectronics, Inc
2128 2.0 6/20/2008
6