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LM10502 データシート(PDF) 6 Page - Texas Instruments

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部品番号 LM10502
部品情報  Dual Buck LDO Power Management Unit
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM10502
SNVS884B – AUGUST 2012 – REVISED MAY 2013
www.ti.com
Buck 1 Electrical Characteristics
(1) (2) (3)
Unless otherwise noted, VIN = 5.0V where: VIN=VVIN_B1 = VVIN_B2. L1 = 2.2µH,C3=C5=22µF,C2=C4=4.7µF.
The application circuit used is the one shown in "Typical Application Circuit."
Limits in standard typeface are for TJ = 25°C.
Limits appearing in boldface type apply over the entire 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
Continuous load current((4)
IOUT-MAX
Buck 1 enabled switching in PWM
1.0
(5) (6) (7))
IPEAK
Peak switching current limit
Buck 1 enabled, switching in PWM
1.3
1.575
1.85
A
η
Efficiency peak, Buck 1(5)
IOUT = 0.3A, VIN = 5.0V
90
%
FSW
Switching Frequency
1.75
2
2.3
MHz
CIN
Input Capacitor(5)
4.7
µF
Output Filter Capacitor(5)
10
22
100
COUT
0mA
≤ IOUT ≤ -IOUT-MAX
Output Capacitor ESR(5)
20
m
L
Output Filter Inductance(5)
2.2
µH
VFB
Feedback Voltage
VOUT = 1.8V (Default) PWM Mode,No Load
-3
3
%
DC Line regulation(5)
3.3V
≤ VIN ≤ 5.0V, IOUT-MAX
0.5
%/V
ΔVOUT
DC Load regulation(5)
100mA
≤ IOUT-MAX
0.3
%/A
Feedback pin input bias
IFB
VFB = 1.8V
2.4
5
µA
current
VIN = 5.0V
140
High Side Switch On
RDS-ON-HS
m
Resistance
VIN = 2.6V
220
Low Side Switch On
RDS-ON-LS
VIN = 5.0V
70
150
m
Resistance
STARTUP
Startup from shutdown, VOUT = 0V, no load, LC =
Internal soft-start (turn on
TSTART
recommended circuit, using software enable, to
0.1
ms
time)(5)
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)
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is ensured. Operating Ratings do not imply ensured performance limits. For ensured performance limits and
associated test conditions, see the General Electrical Characteristics.
(5)
Specification ensured by design. Not tested during production.
(6)
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).
(7)
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.)
6
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