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LM3253 bảng dữ liệu(PDF) 8 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM3253 High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers
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LM3253 bảng dữ liệu(HTML) 8 Page - Texas Instruments

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LM3253
SNVS791Q – FEBRUARY 2012 – REVISED MAY 2013
www.ti.com
SYSTEM CHARACTERISTICS (continued)
The following spec table entries are specified by design and verifications providing the component values in the Typical
Application Circuit are used (L = 1.5 µH, DCR = 90 m
Ω, TOKO DFE252010C (1269AS-H-1R5N), CIN = 10 µF, 6.3V, 0402,
Samsung CL05A106MQ5NUN, COUT = 10 µF + 4.7 µF + 3 x 1.0 µF + 3300 pF: 6.3V, 0402, Samsung CL05A106MQ5NUN,
CL05A475MQNRN; 6.3V, 0201 Samsung CL03A105MQ3CSN; 6.3V, 01005 Murata GRM022R60J332K).
These parameters are not verified by production testing. Min and Max values are specified over the ambient temperature
range TA = −30°C to 90°C. Typical values are specified at PVIN = VDD = EN = 3.8V, BP = 0V and TA = 25°C unless
otherwise stated.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VIN = 3.8V, VOUT = 1.8V,
IOUT = 10 mA
79
82
MODE = HIGH (PFM)
VIN = 3.8V, VOUT = 0.5V,
IOUT = 5 mA
58
60
MODE = HIGH (PFM)
VIN = 3.8V, VOUT = 3.5V,
IOUT = 1900 mA
89
92
MODE = LOW (PWM)
η
Efficiency
%
VIN = 3.8V, VOUT = 2.5V,
IOUT = 250 mA
90
93
MODE = LOW (PWM)
VIN = 3.8V, VOUT = 1.6V,
IOUT = 130 mA
83
86
MODE = LOW (PWM)
VIN = 3.8V, VOUT = 1V,
IOUT = 400 mA
81
84
MODE = LOW (PWM)
VIN = 3.4V to 3.6V, VOUT = 0.4V to
Ripple voltage at no pulse
3.6V, ROUT = 1.9Ω
(3)
1
3
skipping condition
MODE = LOW
Ripple voltage at pulse
VIN = 5.5V to dropout, VOUT = 3.6V,
8
skipping condition
ROUT = 1.9Ω
(3)
VRIPPLE
mVpp
VIN = 3.2V, VOUT < 1.125V,
50
IOUT =10 mA, MODE = HIGH
PFM Ripple Voltage
VIN = 3.2V, VOUT ≤ 0.5V,
50
IOUT = 5 mA, MODE = LOW
VIN = 3.6V to 4.2V, TR = TF = 10 µs,
Line_tr
Line transient response
VOUT = 1V, IOUT = 600 mA
50
mVpk
MODE = LOW
VOUT = 3.0V, TR = TF = 10 µs,
Load_tr
Load transient response
IOUT = 0A to 1.2A
40
mVpk
MODE = LOW
Max Duty cycle
Maximum duty cycle
MODE = LOW
100
%
VIN = 3.2V, VOUT = 1V, IOUT = 10 mA
100
160
MODE = HIGH
PFM_Freq
Minimum PFM Frequency
kHz
VIN = 3.2V, VOUT = 0.5V, IOUT = 5 mA
34
55
MODE = HIGH
(3)
Ripple voltage should be measured at COUT electrode on a well-designed PC board and using the suggested inductor and capacitors.
8
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