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TPS51124 Datasheet(PDF) 5 Page - Texas Instruments

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Part No. TPS51124
Description  DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TPS51124 Datasheet(HTML) 5 Page - Texas Instruments

 
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DEVICE INFORMATION
24
23
22
21
20
19
PGND1
TRIP1
V5IN
V5FILT
TRIP2
PGND2
VO1
VFB1
GND
TONSEL
VFB2
VO2
48
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
QFN PACKAGE
(TOP VIEW)
TPS51124
SLVS616A – NOVEMBER 2005 – REVISED NOVEMBER 2005
TERMINAL FUNCTIONS
TERMINAL
I/O
DESCRIPTION
NAME
NO.
DRVH1
21
Synchronous high-side MOSFET driver outputs. LL node referenced floating drivers. The gate drive
O
voltage is defined by the voltage across VBST to LL node flying capacitor.
DRVH2
10
DRVL1
19
Synchronous low-side MOSFET driver outputs. PGND referenced drivers. The gate drive voltage is
O
defined by V5IN voltage.
DRVL2
12
EN1
23
I
Channel 1 and channel 2 enable pins. Connect to 5 V or 3.3 V to turn on SMPS
EN2
8
GND
3
I
Signal ground pin
LL1
20
Switch node connections for high-side drivers return. Also serve as input to current comparators and input
I/O
voltage monitor for on-time control circuitry.
LL2
11
PGND1
18
Ground returns for DRVL1 and DRVL2. Also serve as input of current comparators. Connect PGND1,
I/O
PGND2, and GND strongly together near the IC. Output discharge current flows through this pin, also.
PGND2
13
PGOOD1
24
Power Good window comparator open drain output for channel 1 and 2. Pull up with a resistor to 5 V, or
O
appropriate signal voltage. Current capability is 5 mA. PGOOD goes high 0.5 ms after VFB comes within
PGOOD2
7
specified limits. Power bad, or the terminal goes low, is within 10
µs.
TONSEL
4
I
On-time selection pin. See Table 1.
TRIP1
17
Over-current trip point set input. Connect resistor from this pin to GND to set threshold for synchronous
I
low-side RDS(on) sense. Voltage across this pin and GND is compared to voltage across PGND and LL at
TRIP2
14
over-current comparator.
VBST1
22
Supply input for synchronous high-side MOSFET driver (Boost Terminal). Connect capacitor from this pin
I
to respective LL terminals. An internal PN diode is connected between V5IN to each of these pins. User
VBST2
9
can add external Schottky diode if forward drop is critical to drive the MOSFET.
VFB1
2
I
SMPS voltage feedback inputs. Connect with feedback resistor divider.
VFB2
5
VO1
1
Output connections to SMPS. These terminals serve two functions: On-time adjustment and output
I
discharge.
VO2
6
5-V power supply input for the entire control circuit except the MOSFET drivers. Connect RC low-pass
V5FILT
15
I
filter from V5IN to V5FILT.
V5IN
16
I
5-V power supply input for FET gate drivers. Internally connected to VBSTx by PN diodes.
5


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