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参数资料
| 型号： | TPS65270RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 1400 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, PLASTIC, VQFN-24 |
| 文件页数： | 16/20页 |
| 文件大小： | 1432K |
| 代理商： | TPS65270RGET |
SLVSAX7
– AUGUST 2011
TERMINAL FUNCTIONS
NO.
NAME
DESCRIPTION
(HTSSOP)
(QFN)
Enable for Buck 1. Logic high enables the Buck 1; Logic low disables
Buck 1. If pin is left open a weak internal pull-up to V5V will allow for
EN1
1
16
automatic enable; For a delayed start-up add a small ceramic capacitor
from this pin to ground.
Feedback voltage for Buck 1. Connect a resistor divider to set 0.8 V from
FB1
2
17
the output of the converter to ground.
Soft start input for Buck 1. An internal 5-
A charging current is sourcing to
SS1
3
18
this pin. Connect a small ceramic capacitor to this pin to set the Buck 1
soft start time.
Loop compensation pin for Buck 1. Connect a series RC circuit to this pin
COMP1
4
19
to compensate the control loop of this converter.
Low power operation mode. With active high, Buck 1 and Buck 2 operate
LOW_P
5
20
at pulse skipping mode at light load; active low forces both Buck 1 and
Buck 2 to PWM mode; this pin can
’t be left open.
Internal 6.5-V power supply bias. Connect a 10-
F ceramic capacitor from
VCC
6
21
this pin to ground.
AGND
7
22
Analog ground. Connect all GND pins and power pad together.
Oscillator frequency setup. Connect a resistor to ground to set the
ROSC
8
23
frequency of internal oscillator clock.
Loop compensation pin for Buck 2. Connect a series RC circuit to this pin
COMP2
9
24
to compensate the control loop of this converter.
Soft start input for Buck 2. An internal 5-
A charging current is sourcing to
SS2
10
1
this pin. Connect a small ceramic capacitor to this pin to set the Buck 1
soft start time.
Feedback voltage for Buck 2. Connect a resistor divider to set 0.8 V from
FB2
11
2
the output of the converter to ground.
Enable for Buck 2. Logic high enables the Buck 2. Logic low disables
Buck 2. If pin is left open a weak internal pull-up to V5V will allow for
EN2
12
3
automatic enable; For a delayed start-up add a small ceramic capacitor
from this pin to ground.
Bootstrapped power supply to high side floating gate driver in Buck 2.
BST2
13
4
Connect a 47-nF ceramic capacitor from this pin to the switching node pin
LX2.
Input supply for Buck 2. Connect a 10-
F ceramic capacitor close to this
VIN2
14
5
pin.
LX2
15, 16
6, 7
Switching node connecting to inductor for Buck 2.
GND
17, 18, 19, 20
8, 9, 10, 11
Power ground for Buck 1 and Buck 2.
LX1
21, 22
12, 13
Switching node connecting to inductor for Buck 1.
Input supply for Buck 1. Conne ct a 10-
F ceramic capacitor close to this
VIN1
23
14
pin.
Bootstrapped power supply to high side floating gate driver in Buck 1.
BST1
24
15
Connect a 47-nF ceramic capacitor from this pin to the switching node pin
LX1.
Must be soldered to PCB for optimal thermal performance. Have thermal
Thermal Pad
vias on the PCB to enhance power dissipation.
Copyright
2011, Texas Instruments Incorporated
5
Product Folder Link(s): TPS65270
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