SLUS890 – DECEMBER 2008
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DEVICE INFORMATION
Table 1. TERMINAL FUNCTIONS TABLE
TERMINAL
NAME
DRVH1
DRVH2
DRVL1
DRVL2
EN0
ENC
GND
LL1
LL2
PGOOD
SKIPSEL
TRIP1
TRIP2
NO.
21
10
19
12
13
18
15
20
11
23
14
1
6
I/O
O
O
DESCRIPTION
High-side N-channel MOSFET driver outputs. LL referenced drivers.
Low-side N-channel MOSFET driver outputs. GND referenced drivers.
Master enable input.
Open : LDOs on, and ready to turn both switcher channels.
GND : disable all circuit
Channel 1 and Channel 2 enable input. Pull up to the voltage ranging 3.3-V to 5-V to turn on both
switcher channels. Short to ground to shutdown them.
Ground.
Switch node connections for high-side drivers, current limit and control circuitry.
Powergood window comparator output for channel 1 and 2. (Logical AND)
Selection pin for operation mode:
OOA auto skip : Connect to VREG3 or VREG5
PWM only: Connect to VREF
Auto skip: Connect to GND
OCL trip setting pins. Connect resistor from this pin to GND to set threshold for synchronous R
DS(on)
sense.
On-time adjustment pin.
365 kHz/460 kHz setting:
300 kHz/375 kHz setting:
245 kHz/305 kHz setting:
200 kHz/250 kHz setting:
connect
connect
connect
connect
to VREG5
to VREG3
to VREF
to GND
I/O
I
–
I
O
I
I/O
TONSEL
4
I
VBST1
VBST2
VFB1
VFB2
VIN
VO1
VO2
VREF
VREG3
VREG5
22
9
2
5
16
24
7
3
8
17
I
I
I
I/O
O
O
O
Supply input for high-side N-channel MOSFET driver (boost terminal).
SMPS feedback inputs. Connect with feedback resistor divider.
High voltage power supply input for 5-V/3.3-V LDO.
Output connection to SMPS. These terminals work as fixed voltage inputs and output discharge
inputs. VO1 and VO2 also work as 5-V and 3.3-V switch over return power input respectively.
2-V reference voltage output. Connect 220-nF to 1-µF ceramic capacitor to Signal GND near the
device.
3.3-V power supply output. Connect a 10-µF ceramic capacitor to Power GND near the device. A
1-µF ceramic capacitor is acceptable when not loaded.
5-V power supply output. Connect a 33-µF ceramic capacitor to Power GND near the device.
6
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