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TPS51220 Datasheet(PDF) 9 Page - Texas Instruments

Part # TPS51220
Description  Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS51220 Datasheet(HTML) 9 Page - Texas Instruments

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TPS51220
www.ti.com
SLVS785C – OCTOBER 2007 – REVISED JULY 2009
TERMINAL FUNCTIONS (continued)
TERMINAL
I/O
DESCRIPTION
NAME
NO.
Control architecture and OVP function selection pin.
GND: Current mode, OVP enable
FUNC
11
I
VREF2: D-CAP mode, OVP disable
VREG3: D-CAP mode, OVP enable
VREG5: Current mode, OVP disable
VREF2
13
O
2-V Reference Output. Bypass to (signal) GND by 0.22
μF ceramic capacitor.
Overcurrent trip level and discharge mode selection pin.
GND: V(OCL-ULV) , Discharge on
TRIP
14
I
VREF2: V(OCL-ULV), Discharge off
VREG3: V(OCL-LV), Discharge off
VREG5: V(OCL-LV), Discharge on
VREF2 and VREG5 Linear Regulators Enable Pin. When turning on, apply greater than 1.2V and less than
EN
12
I
6V. Connect to GND to Disable.
VBST1
31
Supply inputs for high-side NFET driver (boot strap Terminal). Connect a capacitor (0.1
μF or greater is
I
recommended) from this pin to respective SW terminal. Additional SB diode from VREG5 to this pin is an
VBST2
26
optional.
DRVL1
30
O
Low-side MOSFET gate driver outputs. Source 1.3
Ω, sink 0.7 Ω, GND referenced driver.
DRVL2
27
VREG5 switchover power supply input pin. When EN1 is high, PGOOD1 indicates GOOD and V5SW
V5SW
2
I
voltage is higher than 4.8 V, switch-over function will be enabled. (Note) When switch-over is enabled,
VREG5 output voltage will be almost the same as V5SW input voltage.
5-V, 100-mA low-dropout linear regulator output. Bypass to (power) GND using a 10-
μF ceramic capacitor.
Runs from VIN supply. Internally connected to VBST and DRVL. Shuts off with EN. Switches over to V5SW
VREG5
29
O
when 4.8 V or above is provided. (Note: when switch-over (above V5SW) is enabled, VREG5 output voltage
is approximately the same as V5SW input voltage.)
VIN
23
I
Supply input for 5-V and 3.3-V linear regulator. Typically connected to VBAT.
GND
28
–
Ground.
Copyright © 2007–2009, Texas Instruments Incorporated
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