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TPS51221 Datasheet(PDF) 9 Page - Texas Instruments

Part # TPS51221
Description  Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS51221 Datasheet(HTML) 9 Page - Texas Instruments

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TPS51221
www.ti.com............................................................................................................................................... SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009
TERMINAL FUNCTIONS
TERMINAL
I/O
DESCRIPTION
NAME
NO.
DRVH1
1
High-side MOSFET gate driver outputs. Source 1.7
Ω, sink 1.0 Ω, SW-node referenced floating driver. Drive
O
voltage corresponds to VBST to SW voltage.
DRVH2
24
SW2
25
I/O
High-side MOSFET gate driver returns.
SW1
32
Always alive 3.3-V, 10-mA low dropout linear regulator output. Bypass to (signal) GND by more than 1-
µF
VREG3
22
O
ceramic capacitor. Runs from VIN supply or from VREG5 when it is switched over to V5SW input.
EN1
4
Channel 1 and Channel 2 SMPS enable pins. When turning on, apply greater than 0.55 V and less than 6 V,
I
or leave floating. Connect to GND to disable. Adjustable soft-start capacitance to be attached here.
EN2
21
PGOOD1
5
Power good window comparator outputs for channel 1 and 2. The applied voltage should be less than 6V
O
and recommended pull-up resistance value is from 100 k
Ω to 1 MΩ.
PGOOD2
20
SKIPSEL1
6
Skip Mode Selection pin.
GND: Continuous Conduction Mode
I
VREF2: Auto Skip
SKIPSEL2
19
VREG3: OOA Auto Skip, maximum 7 skips (use with < 400 kHz)
VREG5: OOA Auto Skip, maximum 15 skips (use with more than 400 kHz)
CSP1
7
Current sense comparator inputs (+). An RC network with high quality X5R or X7R ceramic capacitor should
I/O
be used to extract voltage drop across DCR. 0.1
µF is a good value to start design. Refer to current sensing
CSP2
18
scheme section for more details.
CSN1
8
Current sense comparator inputs (–). (See the current sensing scheme section.) Used as power supply for
I
the current sense circuit for 5 V or higher output voltage setting. Also, used for output discharge.
CSN2
17
VFB1
9
I
SMPS feedback inputs. Connect the feedback resistor divider and should refer to (signal) GND.
VFB2
16
COMP1
10
Loop compensation pin (error amplifier output). Connect R (and C if required) from this pin to VREF2 for
I
proper loop compensation with current mode operation.
COMP2
15
Frequency setting pin. Connect a frequency setting resistor to (signal) GND. Connect to an external clock for
RF
3
I/O
synchronization.
IMON1
11
O
Current monitor outputs for CH1. Adding RC filter is recommended.
VREF2
13
O
2-V reference output. Bypass to (signal) GND by 0.22-
µF ceramic capacitor.
Over current trip level and discharge mode selection pin.
GND: VOCL-ULV, Discharge on
TRIP
14
I
VREF2: VOCL-ULV, Discharge off
VREG3: VOCL-LV, Discharge off
VREG5: VOCL-LV, Discharge on
VREF2 and VREG5 Linear Regulators Enable Pin. When turning on, apply greater than 1.2 V and less than
EN
12
I
6 V. Connect to GND to Disable.
VBST1
31
Supply inputs for high-side N-channel FET driver (boot strap terminal). Connect a capacitor (0.1
µF or
I
greater is recommended) from this pin to respective SW terminal. Additional SB diode from VREG5 to this
VBST2
26
pin is an 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 voltage
V5SW
2
I
is higher than 4.8 V, the switchover function is enabled. (Note: when switchover is enabled, VREG5 output
voltage is approximately the same as the 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 4.8V or above is provided. (Note: when switch-over (see V5SW description above) 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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