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LM3243 датащи(PDF) 7 Page - Texas Instruments

номер детали LM3243
подробное описание детали  High-Current Step-Down Converter
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM3243 датащи(HTML) 7 Page - Texas Instruments

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LM3243
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SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015
System Characteristics (continued)
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
VOUT = 3 V, TR = TF = 10 µs
Load_tr
Load transient response
IOUT = 0 A to 1.2 A
40
mVpk
MODE = LOW
Maximum Duty
Maximum duty cycle
MODE = LOW
100%
Cycle
VIN = 3.2 V, VOUT = 1 V
100
160
IOUT = 10 mA, MODE = HIGH
PFM_Freq
Minimum PFM frequency
kHz
VIN = 3.2 V, VOUT = 0.5 V
34
55
IOUT = 5 mA, MODE = HIGH
6.7 Timing Requirements
MIN
MAX
UNIT
tSETUP
Time for SW pin to become active upon power up; EN = LOW-to-HIGH
30
µs
Turnon time (time for output to reach 90% of final value after EN LOW-to-HIGH
tON
transition)
50
µs
EN = LOW-to-HIGH, VIN = 4.2 V, VCON = 1.36 V, VOUT = 3.4 V, IOUT ≤ 1 mA
Time for VOUT to rise from 0 V to 3 V (90% or 2.7 V);
20
VIN = 4.2 V, RLOAD = 6.8 Ω, VCON = 0 V to 1.2 V
Time for VOUT to fall from 3.6 V to 2.6 V (10% or 2.7 V)
20
VIN = 4.2 V, RLOAD = 6.8 Ω, VCON = 1.44 V to 1.04 V
Time for VOUT to rise from 1.8 V to 2.8 V (90% or 2.7 V)
15
VIN = 4.2 V, RLOAD = 1.9 Ω, VCON = 0.72 V to 1.12 V
tRESPONSE
µs
Time for VOUT to fall from 2.8 V to 1.8 V (10% or 1.9 V)
15
VIN = 4.2 V, RLOAD = 1.9 Ω, VCON = 1.12 V to 0.72 V
Time for VOUT to rise from 0 V to 3.4 V (90% or 3.1 V)
20
VIN = 4.2 V, RLOAD = 1.9 Ω, VCON = 0 V to 1.36 V
Time for VOUT to fall from 3.4 V to 0.4 V (10% or 0.7 V)
20
VIN = 4.2 V, RLOAD = 1.9 Ω, VCON = 1.36 V to 0.16 V
Time for VOUT to rise from 0 V to PVIN after BP LOW-to-HIGH transition (90%)
tBypass
20
µs
VCON = 0 V, IOUT ≤ 1 mA
Bypass turnon time. Time for VOUT to rise from 0 V to PVIN after EN LOW-to-
tBypass, ON
HIGH transition (90% or 3.24)
50
µs
EN = VIN= 3.8 V, IOUT ≤ 1 mA
Copyright © 2010–2015, Texas Instruments Incorporated
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