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LM3243 Datasheet(PDF) 6 Page - Texas Instruments

Part # LM3243
Description  LM3243 High-Current Step-Down Converter for 2G, 3G, and 4G RF Power Amplifiers
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LM3243 Datasheet(HTML) 6 Page - Texas Instruments

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LM3243
SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015
www.ti.com
6.6 System Characteristics
The following spec table entries are specified by design and verifications providing the component values in the Typical
System Application Diagram are used (L = 1.5 µH, DCR = 120 m
Ω, TOKO DFE201610C-1R5N, CIN = 10 µF, 6.3 V, 0402,
Samsung CL05A106MQ5NUN, COUT = 10 µF + 4.7 µF + 3 × 1 µF + 3300 pF: 6.3 V, 0402, Samsung CL05A106MQ5NUN,
CL05A475MQNRN; 6.3 V, 0201 Samsung CL03A105MQ3CSN; 6.3 V, 01005 Murata GRM022R60J332K). These parameters
are not verified by production testing. Minimum (MIN) and maximum (MAX) values are specified over the ambient
temperature range TA = −30°C to 90°C. Typical (TYP) values are specified at PVIN = VDD = EN = 3.8 V, BP = 0 V and TA =
25°C unless otherwise stated.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VCON = 1.5 V
Total dropout resistance in
Rtot_drop
Max value at VIN = 3.1 V
45
55
m
bypass mode
Inductor ESR
≤ 151 mΩ
Pin input capacitance for BP,
CIN
Test frequency = 100 KHz
5
pF
EN, MODE
Maximum load current in
IOUT
Switcher + ACB
2.5
PWM mode
Maximum output transient
IOUT, PU
3
A
pullup current limit
Switcher + ACB(1)
PWM maximum output
IOUT, PD, PWM
−3
transient pulldown current limit
Maximum output load current
VIN = 3.8 V, VCON < 1
IOUT, MAX-PFM
85
mA
in PFM mode
MODE = HIGH(1)
−3%
3%
Linearity in control range of
VIN = 4.2 V
(2)
Linearity
VCON = 0.16 V to 1.44 V
Monotonic in nature
−50
50
mV
VIN = 3.8 V, VOUT = 1.8 V
IOUT = 10 mA
79%
82%
MODE = HIGH (PFM)
VIN = 3.8 V, VOUT = 0.5 V
IOUT = 5 mA
58%
60%
MODE = HIGH (PFM)
VIN = 3.8 V, VOUT = 3.5 V
IOUT = 1900 mA
89%
92%
MODE = LOW (PWM)
η
Efficiency
VIN = 3.8 V, VOUT = 2.5 V
IOUT = 250 mA
90%
93%
MODE = LOW (PWM)
VIN = 3.8 V, VOUT = 1.6 V
IOUT = 130 mA
83%
86%
MODE = LOW (PWM)
VIN = 3.8 V, VOUT = 1 V
IOUT = 400 mA
81%
84%
MODE = LOW (PWM)
VIN = 0.4 V to 3.6 V
Ripple voltage at no pulse
VOUT = 0.4 V to 3.6 V,
1
3
skipping condition
ROUT = 1.9 Ω
(3)
MODE = LOW
Ripple voltage at pulse
VIN = 5.5 V to dropout, VOUT = 3.6 V,
8
skipping condition
ROUT = 1.9 Ω
(3)
VRIPPLE
mVpp
VIN = 3.2 V, VOUT < 1.125 V
50
IOUT =10 mA, MODE = HIGH
PFM ripple voltage
VIN = 3.2 V, VOUT ≤ 0.5 V,
IOUT = 5 mA
50
MODE = HIGH
VIN = 3.6 V to 4.2 V, TR = TF = 10 µs,
Line_tr
Line transient response
VOUT = 1 V
50
mVpk
IOUT = 600 mA, MODE = LOW
(1)
Current limit is built-in, fixed, and not adjustable.
(2)
Linearity limits are ±3% or ±50 mV, whichever is larger.
(3)
Ripple voltage should be measured at COUT electrode on a well-designed PC board and using the suggested inductor and capacitors.
6
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