SC197 Datasheet, PDF (10/20 Pages) Semtech Corporation – 3.5MHz, 500mA Synchronous Dual Step-Down DC-DC Regulator

SC197
Pin Descriptions
Pin
Pin Name Pin Function
1
ctl1A
Control bit 1A — see Table 1, page 2, for output voltage selection. This pin has a weak pull-down resistor
(> 1MΩ) in place at reset that is removed when CTL1 is pulled above the logic high threshold.
2
ctl0A
Control bit 0A — see Table 1, page 2, for output voltage selection. This pin has a weak pull-down resistor
(> 1MΩ) in place at reset that is removed when CTL0 is pulled above the logic high threshold.
Output voltage sense B — output voltage regulation point (connection node of inductor and output
3
outB
capacitor).
4
GNDB
Ground B — reference and power ground for the SC197.
5
lxB
Switching output B — connect an inductor between this pin and the load to filter the pulsed output current.
6
NC
No connection
7
inB
Input power supply B — connect a bypass capacitor from this pin to GND.
Control bit 3B — see Table 1, page 2, for output voltage selection. This pin has a weak pull-down resistor
8
ctl3B
(> 1MΩ) in place at reset that is removed when CTL3 is pulled above the logic high threshold.
9
ctl2B
Control bit 2B — see Table 1, page 2, for output voltage selection. This pin has a weak pull-down resistor
(> 1MΩ) in place at reset that is removed when CTL2 is pulled above the logic high threshold.
10
ctl1B
Control bit 1B — see Table 1, page 2, for output voltage selection. This pin has a weak pull-down resistor
(> 1MΩ) in place at reset that is removed when CTL1 is pulled above the logic high threshold.
11
ctl0B
Control bit 0B — see Table 1, page 2, for output voltage selection. This pin has a weak pull-down resistor
(> 1MΩ) in place at reset that is removed when CTL0 is pulled above the logic high threshold.
12
outA
Output voltage sense A — output voltage regulation point (connection node of inductor and output
capacitor).
13
GNDA
Ground A — reference and power ground for the SC197.
14
lxA
Switching output A — connect an inductor between this pin and the load to filter the pulsed output current.
15
NC
No connection
16
inA
Input power supply A — connect a bypass capacitor from this pin to GND.
17
ctl3A
Control bit 3A— see Table 1, page 2, for output voltage selection. This pin has a weak pull-down resistor
(> 1MΩ) in place at reset that is removed when CTL3 is pulled above the logic high threshold.
Control bit 2A — see Table 1, page 2, for output voltage selection. This pin has a weak pull-down resistor
18
ctl2A
(> 1MΩ) in place at reset that is removed when CTL2 is pulled above the logic high threshold.
Notes
(1) Any of pins CTL3A, CTL2A, CTL1A, and CTL0A may be connected together to function as a single input for enable and disable.
(2) Any of pins CTL3B, CTL2B, CTL1B, and CTL0B may be connected together to function as a single input for enable and disable.
(3) A and B devices are electrically isolated and share no common connections internally. CTLxA and CTLxB pins may only be connected together
when A and B devices share the same power source, INA and INB are connected together, and GNDA and GNDB are connected together. Note
that connecting any CTLxA and CTLxB pins together will force both A and B devices to make output voltage changes simultaneously.
10