參數(shù)資料
型號： TPS65270RGET
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 1400 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, PLASTIC, VQFN-24
文件頁數(shù)： 18/20頁
文件大?。?/td> 1432K
代理商： TPS65270RGET
SLVSAX7
– AUGUST 2011
ELECTRICAL CHARACTERISTICS
TA = -40°C to 125°C, VIN = 12 V, fSW = 625 kHz (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INPUT SUPPLY
VIN
Input Voltage range
VIN1 and VIN2
4.5
16
V
IDDSDN
Shutdown
EN1 = EN2 = 0 V
10
A
Non switching quiescent power supply
VFB1 = VFB2 = 900 mV,
IDDQ_nsw
1
mA
current
LOW_P = high
Rising VIN
4
4.20
4.45
UVLO
VIN under voltage lockout
Falling VIN
3.65
3.85
4.10
V
Hysteresis
0.35
VCC load current = 0 A,
VCC
Internal biasing supply
6.25
V
VIN = 12 V
VIN = 5 V,
VCC_drop
VCC LDO Drop-Out Voltage
180
mV
VCC load current = 20 mA
IVCC
VCC current limit
4.5 V
< VIN < 16 V
200
mA
FEEDBACK AND ERROR AMPLIFIER
VIN = 12 V , VCOMP = 1.2 V,
-1%
0.8
1%
TJ = 25°C
VFB
Regulated feedback voltage
V
VIN = 12 V, VCOMP = 1.2 V,
-2%
0.8
2%
TJ = -40°C to 125°C
VIN = 4.5 V to 16 V,
VLINEREG
Line regulation - DC
0.5
%/V
IOUT = 1 A
IOUT = 10 % - 90%
VLOADREG
Load regulation - DC
0.4
%/A
IOUT,MAX
Gm_EA
Error amplifier trans-conductance
-2
A < ICOMP < 2 A
130
s
Gm_SRC
COMP voltage to inductor current Gm
ILX = 0.5 A
10
A/V
ENABLE, PFM MODE AND SOFT-START
Rising
1.55
VEN
EN1 and EN2 pin threshold
V
Falling
0.4
Rising
1.55
VPSM
PSM low power mode threshold
V
Falling
0.4
ISS
SS1 and SS2 soft-start charging current
5
A
OSCILLATOR
FSW_BK
Switching frequency range
Set by external resistor ROSC
0.3
1.4
MHz
ROSC = 250 k
Ω
0.85
1
1.15
MHz
FSW
Programmable frequency
ROSC = 500 k
Ω
425
500
575
kHz
PROTECTION
ILIMIT1
Buck 1 peak inductor current limit
4.5 V
< VIN < 16 V
3.2
A
ILIMIT1_LS1
Buck 1 low side MOSFET current limit
4.5 V
< VIN < 16 V
2
A
ILIMIT2
Buck 2 peak inductor current limit
4.5 V
< VIN < 16V
4.1
A
ILIMIT1_LS2
Buck 2 low side MOSFET current limit
4.5 V
< VIN < 16 V
2
A
MOSFET ON-RESISTANCES
Rdson_HS1
On resistance of high side FET on CH1
BST1 to LX1 = 6.25 V
120
m
Ω
Rdson_LS1
On resistance of low side FET on CH1
VIN = 12 V
80
m
Ω
Rdson_HS2
On resistance of high side FET on CH2
BST2 to LX2 = 6.25 V
95
m
Ω
Rdson_LS2
On resistance of low side FET on CH2
VIN = 12 V
50
m
Ω
Ton_min
Minimum in time
80
120
ns
THERMAL SHUTDOWN
TTRIP
Thermal protection trip point
Rising temperature
160
°C
THYST
Thermal protection hysteresis
20
°C
Copyright
2011, Texas Instruments Incorporated
7
Product Folder Link(s): TPS65270
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