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LM10524 データシート(PDF) 8 Page - Texas Instruments

部品番号 LM10524
部品情報  LM10524 Triple Buck Power Management Unit
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LM10524 データシート(HTML) 8 Page - Texas Instruments

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LM10524
SNVS986A – AUGUST 2013 – REVISED JANUARY 2014
www.ti.com
Buck 1 Electrical Characteristics
(1) (2) (3)
Unless otherwise noted, VVIN = 5.0V where: VVIN=VVIN_B1 = VVIN_B2 = VVIN_B3.
The application circuit used is the one shown in “Typical Application Circuit".
Limits in standard typeface are for TJ = 25°C.
Limits in boldface type apply over the full operating junction temperature range of -30°C
≤ TA=TJ ≤ +85°C.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
IQ
DC Bias Current in VIN
No Load, PFM Mode
15
50
µA
IOUT-MAX
Continuous maximum load
Buck 1 enabled, switching in PWM
1.6
A
current(4)(5)(6)
IPEAK
Peak switching current limit
Buck 1 enabled, switching in PWM
1.9
2.2
2.8
η
Efficiency peak, Buck 1(4)
IOUT = 0.3 A, VVIN = 3.3V
90
%
FSW
Switching Frequency
1.75
2
2.3
MHz
CIN
Input Capacitor(4)
0mA
≤ IOUT ≤ IOUT-MAX
4.7
µF
COUT
Output Filter Capacitor(4)
22
47
100
Output Capacitor ESR(4)
20
m
Ω
L
Output Filter Inductance(4)
2.2
µH
∆VOUT
DC Line regulation(4)
3.3V
≤ VVIN ≤ 5V, IOUT = IOUT-MAX
0.5
%/V
DC Load regulation, PWM(4)
VVIN=3.3V, 0.1 * IOUT-MAX ≤ IOUT
0.3
%/A
IOUT-MAX
IFB
Feedback pin input bias
VFB = 2.85V
2.3
5
µA
current
VFB
Feedback Accuracy
VFB = 2.85V
-3
3
%
RDS-ON-HS
High Side Switch On
115
m
Resistance
VVIN = 2.6V
190
RDS-ON-LS
Low Side Switch On
60
110
Resistance
RDS-ON-BYPASS
Bypass FET on resistance
Used in parallel with the high side
FET while in Bypass mode.
Resistance (DCR) of inductor = 100
m
VIN = 3.1V
75
m
VIN = 2.6V
120
Startup
Tstart_NoLoad
Internal soft-start (turn on
Start up from shutdown, VOUT=0V,
0.1
ms
time)(4)
no load, LC = recommended circuit,
using software enable, to VOUT =
95% of final value
Tstart_FullLoad
Internal soft-start (turn on
Start up from shutdown, VOUT
0.5
time)(4)
=0V, Maximum Load, LC =
recommended circuit, using
software enable, to VOUT = 95% of
final value
(1)
All limits are ensured by design, test and/or statistical analysis. All electrical characteristics having room-temperature limits are tested
during production with TJ = 25°C. All hot and cold limits are ensured by correlating the electrical characteristics to process and
temperature variations and applying statistical process control.
(2)
Capacitors: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) are used in setting electrical characteristics.
(3)
BUCK normal operation is ensured if VIN ≥ VOUT+1.0V.
(4)
Specification ensured by design. Not tested during production.
(5)
In applications where high power dissipation and/or poor thermal resistance is present the maximum ambient temperature may have to
be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = +125°C),
the maximum power dissipation of the device in the application (PD-MAX), and the junction-to-ambient thermal resistance of the
part/package in the application (
θJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (θJA × PD-MAX).
(6)
The amount of Absolute Maximum power dissipation allowed for the device depends on the ambient temperature and can be calculated
using the formula: P = (TJ–TA)/θJA, where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to-
ambient thermal resistance.
θJA is highly application and board-layout dependent. Internal thermal shutdown circuitry protects the device
from permanent damage. (See General Electrical Characteristics.)
8
Copyright © 2013–2014, Texas Instruments Incorporated
Product Folder Links: LM10524


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