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參數資料
| 型號： | TPS51220ARTVR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, PLASTIC, QFN-32 |
| 文件頁數： | 52/53頁 |
| 文件大小： | 1380K |
| 代理商： | TPS51220ARTVR |
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DRVH2
VIN
VREG3
EN2
DRVH1
V5SW
RF
EN1
PGOOD2
SKIPSEL2
CSP2
CSN2
PGOOD1
SKIPSEL1
CSP1
CSN1
VFB1
SW1
VBST1
DR
VL1
VREG5
GND
DR
VL2
VBST2
SW2
COMP1
FUNC
EN
VREF2
TRIP
COMP2
VFB2
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
9
10
1
12
13
14
15
16
32
31
30
29
28
27
26
25
TPS51220A
RSNPACKAGE
(TOP VIEW)
DRVH2
VIN
VREG3
EN2
DRVH1
V5SW
RF
EN1
PGOOD2
SKIPSEL2
CSP2
CSN2
PGOOD1
SKIPSEL1
CSP1
CSN1
VFB1
SW1
VBST1
DR
VL1
VREG5
GND
DR
VL2
VBST2
SW2
COMP1
FUNC
EN
VREF2
TRIP
COMP2
VFB2
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
9
10
1
12
13
14
15
16
32
31
30
29
28
27
26
25
TPS51220A
RTVPACKAGE
(TOP VIEW)
SLUS897D – DECEMBER 2008 – REVISED FEBRUARY 2010
www.ti.com
DEVICE INFORMATION
PIN FUNCTIONS
PIN
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 with more than 1-mF
VREG3
22
O
ceramic capacitance. 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
Powergood window comparator outputs for channel 1 and channel 2. The recommended applied voltage
O
should be less than 6 V, and the 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 (suitable for fsw < 400kHz)
VREG5: OOA Auto Skip, maximum 15 skips (suitable for equal to or greater than 400kHz)
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-mF is a good value to start the design. See the current
CSP2
18
sensing scheme section for more details.
CSN1
8
Current sense comparator inputs (–). See the current sensing scheme section. Used as power supply for the
I
current sense circuit for 5V or higher output voltage setting. Also, used for output discharge terminal.
CSN2
17
VFB1
9
SMPS voltage feedback Inputs. Connect the feedback resistors divider, and should be referred to (signal)
I
GND.
VFB2
16
COMP1
10
Loop compensation pin for current mode (error amplifier output). Connect R (and C if required) from this pin
to VREF2 for proper loop compensation with current mode operation. Ramp compensation adjustable pin for
I
D-CAP mode, connect R from this pin to VREF2. 10 k
is a good value to start the design. 6 k to 20 k
COMP2
15
can be chosen. See the D-CAP MODE section for more details.
Frequency setting pin. Connect a frequency setting resistor to (signal) GND. Connect to an external clock for
RF
3
I/O
synchronization.
8
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS51220A
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