参数资料
型号: TPS54478RTET
厂商: Texas Instruments
文件页数: 5/38页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 4A 16WQFN
标准包装: 1
系列: SWIFT™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 4.5 V
输入电压: 2.95 V ~ 6 V
PWM 型: 电流模式
频率 - 开关: 500kHz
电流 - 输出: 4A
同步整流器:
工作温度: -40°C ~ 150°C
安装类型: 表面贴装
封装/外壳: 16-WFQFN 裸露焊盘
包装: 标准包装
供应商设备封装: 16-WQFN 裸露焊盘(3x3)
其它名称: 296-29064-6

ELECTRICAL CHARACTERISTICS (continued)
T J = – 40 ° C to 150 ° C, VIN = 2.95 to 6 V (unless otherwise noted)
SLVSAS2 – JUNE 2011
DESCRIPTION
Output low
Minimum VIN for valid output
CONDITIONS
I (PWRGD) = 3 mA
V (PWRGD) < 0.5 V at 100 μ A
MIN
TYP
0.2
1.2
MAX
0.3
1.6
UNIT
V
V
DEVICE INFORMATION
PIN CONFIGURATION
QFN16
RTE PACKAGE
(TOP VIEW)
16
15
14
13
VIN
1
12
PH
VIN
2
PowerPAD
11
PH
(17)
GND
GND
3
4
10
9
PH
SS/TR
5
6
7
8
PIN FUNCTIONS
NAME
AGND
BOOT
PIN
NO.
5
13
DESCRIPTION
Analog Ground should be electrically connected to GND close to the device.
A bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor is below the minimum
required by the BOOT UVLO, the output is forced to switch off until the capacitor is refreshed.
COMP
EN
GND
PH
PowerPAD
PWRGD
RT/CLK
SS/TR
VIN
7
15
3, 4
10, 11,
12
17
14
8
9
1, 2, 16
Error amplifier output, and input to the output switch current comparator. Connect frequency compensation
components to this pin.
Enable pin, internal pull-up current source. Pull below 1.21 V to disable. Float to enable. Can be used to set the
on/off threshold (adjust UVLO) with two additional resistors.
Power Ground. This pin should be electrically connected directly to the power pad under the IC.
The source of the internal high side power MOSFET, and drain of the internal low side (synchronous) rectifier
MOSFET.
GND pin should be connected to the exposed power pad for proper operation. This power pad should be
connected to any internal PCB ground plane using multiple vias for good thermal performance.
An open drain output; asserts low if output voltage is low due to thermal shutdown, overcurrent,
over/under-voltage or EN shut down.
Resistor Timing or External Clock input pin.
Slow start and tracking. An external capacitor connected to this pin sets the output voltage rise time. The SS
provides higer charge current when SS is below 0.15V, resulting in two slopes of the SS voltage.
This pin can also be used for tracking.
Input supply voltage, 2.95 V to 6 V.
Copyright ? 2011, Texas Instruments Incorporated
5
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