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| 型号： | TPS53321RGTR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1210 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 3/23页 |
| 文件大小： | 505K |
| 代理商： | TPS53321RGTR |
12
11
2
VDD
AGND
SYNC
TPS53321
UDG-10206
1
8
EN
PS
4
3
VBST
PGD
10
FB
L1
1 mH
9
COMP
15
PGND
16
PGND
13
VIN
14
VIN
6
7
5
SW SW SW
EN
SYNC
C8
1 mF
R6
2.2 W
C6
0.1 mF
V
IN
C2 2.2 nF
R4
4.02 kW
C3
100 pF
C1
2.2 nF
R3
20 W
PGD
R5
57.6 kW
C4
0.1 mF
V
IN
Output all MLCCs
C5
22 mF
C
OUT
3 x 22 mF
R1
4.02 kW
R2
4.02 kW
R7
20 kW
www.ti.com
SLUSAF3 – DECEMBER 2010
APPLICATION INFORMATION
Application Circuit Diagram
Figure 13. Typical 3.3-V input Application Circuit Diagram
Overview
The TPS53321 is a high-efficiency switching regulator with two integrated N-channel MOSFETs and is capable
of delivering up to 5 A of load current. The TPS53321 provides output voltage between 0.6 V and 0.84 × VIN from
2.9 V to 6.0 V wide input voltage range.
This device employs five operation modes to fit various application needs. The master/slave mode enables a
two-phase interleaved operation to reduce input ripple. The skip mode operation provides reduced power loss
and increases the efficiency at light load. The unique, patented PWM modulator enables smooth light load to
heavy load transition while maintaining fast load transient.
Operation Modes
The TPS53321 offers five operation modes determined by the PS pin connections listed in Table 1.
Table 1. Operation Mode Selection
PS PIN CONNECTION
OPERATION MODE
AUTO-SKIP AT LIGHT LOAD
MASTER/SLAVE SUPPORT
GND
FCCM Slave
Slave
24.3 k
Ω to GND
DE Slave
Yes
Slave
57.6 k
Ω to GND
HEF Mode
Yes
174 k
Ω to GND
DE Master
Yes
Master
Floating or pulled to VDD
FCCM Master
Master
In forced continuous conduction mode (FCCM), the high-side FET is ON during the on-time and the low-side FET
is ON during the off-time. The switching is synchronized to the internal clock thus the switching frequency is
fixed.
In diode emulation (DE) mode, the high-side FET is ON during the on-time and low-side FET is ON during the
off-time until the inductor current reaches zero. An internal zero-crossing comparator detects the zero crossing of
inductor current from positive to negative. When the inductor current reaches zero, the comparator sends a
signal to the logic control and turns off the low-side FET.
Copyright 2010, Texas Instruments Incorporated
11
Product Folder Link(s) :TPS53321
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