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LM3253 Datasheet(PDF) 7 Page - Texas Instruments

Part # LM3253
Description  LM3253 High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3253 Datasheet(HTML) 7 Page - Texas Instruments

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LM3253
www.ti.com
SNVS791Q – FEBRUARY 2012 – REVISED MAY 2013
SYSTEM CHARACTERISTICS
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
Time for SW pin to become
tSETUP
EN = LOW-to-HIGH
30
active upon power-up
Turn-on time (time for output
µs
EN = LOW-to-HIGH, VIN = 4.2V,
to reach 90% of final value
tON
VCON = 1.36V, VOUT = 3.4V,
50
after EN LOW-to-HIGH
IOUT ≤ 1 mA
transition)
VIN = 4.2V
Time for VOUT to rise from 0V
RLOAD = 6.8Ω,
to 3V (90% or 2.7V)
VCON = 0V to 1.2V
20
Time for VOUT to fall from
VIN = 4.2V, RLOAD = 6.8Ω,
3.6V to 2.6V (10% or 2.7V)
VCON = 1.44V to 1.04V
Time for VOUT to rise from
VIN = 4.2V, RLOAD = 1.9Ω,
1.8V to 2.8V (90% or 2.7V)
VCON = 0.72V to 1.12V
tRESPONSE
µs
15
Time for VOUT to fall from
VIN = 4.2V, RLOAD = 1.9Ω,
2.8V to 1.8V (10% or 1.9V)
VCON = 1.12V to 0.72V
Time for VOUT to rise from 0V
VIN = 4.2V, RLOAD = 1.9Ω,
to 3.4V (90% or 3.1V)
VCON = 0V to 1.4V
20
Time for VOUT to fall from
VIN = 4.2V, RLOAD = 1.9Ω,
3.4V to 0.4V (10% or 0.7V)
VCON = 1.4V to 0.16V
Time for VOUT to rise from 0V
tBypass
to PVIN after BP LOW-to-
VCON = 0V, IOUT ≤ 1mA
20
HIGH transition (90%)
µs
Bypass turn-on time. Time for
VOUT to rise from 0V to PVIN
tBypass, ON
EN = VIN= 3.8V, IOUT ≤ 1 mA
50
after EN LOW-to-HIGH
transition (90% or 3.24)
VCON = 1.5V, Max value at
Total dropout resistance in
Rtot_drop
VIN = 3.1V,
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
3.0
PWM mode
Maximum output transient
IOUT, PU
3.4
A
pullup current limit
Switcher + ACB(1)
PWM maximum output
IOUT, PD, PWM
−3.0
transient pulldown current limit
Maximum output load current
VIN = 3.8V, VCON < 1V
IOUT, MAX-PFM
85
mA
in PFM mode
MODE = HIGH(1)
−3
+3
%
Linearity in control range of
VIN = 4.2V
(1)
Linearity(2)
VCON = 0.16V to 1.44V
Monotonic in nature
−50
+50
mV
(1)
Current limit is built-in, fixed, and not adjustable.
(2)
Linearity limits are ±3% or ±50 mV, whichever is larger.
Copyright © 2012–2013, Texas Instruments Incorporated
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