參數(shù)資料
型號(hào)： TPS51221RTVRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數(shù)： 39/39頁
文件大?。?/td> 829K
代理商： TPS51221RTVRG4
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
, sink 1.0 , 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-
F
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
to 1 M.
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
F 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-
F 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
F 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
, sink 0.7 , 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
F 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
9
Product Folder Link(s): TPS51221
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參數(shù)描述
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