参数资料
型号: TPS54478RTER
厂商: Texas Instruments
文件页数: 3/38页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 4A 16WQFN
标准包装: 3,000
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: 带卷 (TR)
供应商设备封装: 16-WQFN 裸露焊盘(3x3)

THERMAL INFORMATION
TPS54478
SLVSAS2 – JUNE 2011
THERMAL METRIC (1) (2) (3)
(RTE)
(QFN-16) PINS
UNITS
θ JA
ψ JT
Junction-to-ambient thermal resistance
Junction-to-top characterization parameter
49.1
0.7
ψ JB
θ JC(top)
θ JC(bottom)
θ JB
Junction-to-board characterization parameter
Junction-to-case(top) thermal resistance
Junction-to-case(bottom) thermal resistance
Junction-to-board thermal resistance
21.8
50.7
7.5
21.8
° C/W
(1)
(2)
(3)
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953 .
Maximum power dissipation may be limited by overcurrent protection
Power rating at a specific ambient temperature TA should be determined with a junction temperature of 150 ° C. This is the point where
distortion starts to substantially increase. Thermal management of the PCB should strive to keep the junction temperature at or below
150 ° C for best performance and long-term reliability. See power dissipation estimate in application section of this data sheet for more
information.
ELECTRICAL CHARACTERISTICS
T J = – 40 ° C to 150 ° C, VIN = 2.95 to 6 V (unless otherwise noted)
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY VOLTAGE (VIN PIN)
Operating input voltage
Input under voltage lockout threshold
No voltage hysteresis
2.95
2.6
6.0
V
V
Shutdown supply current
Quiescent Current - I q
EN = 0 V, 25 ° C, 2.95 V ≤ VIN ≤ 6 V
VSENSE = 0.7 V, VIN = 5 V, 25 ° C, RT = 78.7 k ?
0.7
525
2.5
700
μ A
μ A
ENABLE AND UVLO (EN PIN)
Enable threshold
Input current
Rising
Falling
Enable threshold + 50 mV
Enable threshold – 50 mV
1.30
1.21
– 3.4
– 0.64
V
μ A
VOLTAGE REFERENCE (VSENSE PIN)
Voltage Reference
2.95 V ≤ VIN ≤ 6 V, – 40 ° C < T J < 150 ° C
0.594
0.600
0.606
V
MOSFET
High side switch resistance
Low side switch resistance
BOOT-PH = 5 V
BOOT-PH = 3.3 V
VIN = 5 V
VIN = 3.3 V
30
37
30
37
60
70
60
70
m ?
m ?
ERROR AMPLIFIER
Input current
7
nA
Error amplifier transconductance (gm)
Error amplifier transconductance (gm) during
slow start
Error amplifier source/sink
COMP to Iswitch gm
Copyright ? 2011, Texas Instruments Incorporated
– 2 μ A < I (COMP) < 2 μ A, V (COMP ) = 1 V
– 2 μ A < I (COMP) < 2 μ A, V (COMP) = 1 V,
Vsense = 0.4 V
V (COMP) = 1 V, 100 mV overdrive
225
77
± 20
14
μ mhos
μ mhos
μ A
A/V
3
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