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LM2738 Datasheet(PDF) 5 Page - Texas Instruments

Part # LM2738
Description  1.5A Step-Down DC-DC Switching Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2738 Datasheet(HTML) 5 Page - Texas Instruments

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LM2738
www.ti.com
SNVS556C – APRIL 2008 – REVISED JANUARY 2016
Product Folder Links: LM2738
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Copyright © 2008–2016, Texas Instruments Incorporated
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and device Package Thermal Metrics
application report, SPRA953.
(2)
Typical thermal shutdown occurs if the junction temperature exceeds 165°C. The maximum power dissipation is a function of TJ(MAX) ,
RθJA and TA . The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) – TA) / RθJA. All numbers apply for
packages soldered directly onto a 3 inches × 3 inches PC board with 2 oz. copper on 4 layers in still air in accordance to JEDEC
standards. Thermal resistance varies greatly with layout, copper thickness, number of layers in PCB, power distribution, number of
thermal vias, board size, ambient temperature, and air flow.
6.4 Thermal Information
THERMAL METRIC(1)
LM2738
UNIT
NGQ (WSON)
DGN (MSOP
PowerPAD)
8 PINS
8 PINS
RθJA
Junction-to-ambient thermal resistance (2)
45.9
50.3
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
44.6
54.2
°C/W
RθJB
Junction-to-board thermal resistance
13.2
31.4
°C/W
ψJT
Junction-to-top characterization parameter
0.5
4.8
°C/W
ψJB
Junction-to-board characterization parameter
13.2
31.2
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
5.8
4
°C/W
(1)
Ensured to average outgoing quality level (AOQL).
(2)
Typicals represent the most likely parametric norm.
6.5 Electrical Characteristics
All typical limits apply over TJ = 25°C, and all maximum and minimum limits apply over the full operating temperature range
(TJ = –40°C to +125°C). VIN = 12 V, VBOOST – VSW = 5 V unless otherwise specified. Data sheet minimum and maximum
specification limits are ensured by design, test, or statistical analysis.
PARAMETER
TEST CONDITIONS
MIN(1)
TYP(2)
MAX(1)
UNIT
VFB
Feedback voltage
0.784
0.800
0.816
V
ΔVFB/ΔVIN
Feedback voltage line regulation
VIN = 3 V to 20 V
0.02
%/V
IFB
Feedback input bias current
Sink or source
0.1
100
nA
UVLO
Undervoltage lockout
VIN Rising
2.7
2.9
V
Undervoltage lockout
VIN Falling
2
2.3
UVLO hysteresis
0.4
FSW
Switching frequency
LM2738X
1.28
1.6
1.92
MHz
LM2738Y
0.364
0.55
0.676
DMAX
Maximum duty cycle
LM2738X , Load = 150 mA
92%
LM2738Y, Load = 150 mA
95%
DMIN
Minimum duty cycle
LM2738X
7.5%
LM2738Y
2%
RDS(ON)
Switch ON resistance
VBOOST – VSW = 3 V, Load = 400 mA
250
500
m
ICL
Switch current limit
VBOOST – VSW = 3 V, VIN = 3 V
2
2.9
A
IQ
Quiescent current
Switching
1.9
3
mA
Non-Switching
1.9
mA
Quiescent current (shutdown)
VEN = 0 V
400
nA
IBOOST
Boost pin current
LM2738X (27% Duty Cycle)
4.5
mA
LM2738Y (27% Duty Cycle)
2.5
VEN_TH
Shutdown threshold voltage
VEN Falling
0.4
V
Enable threshold voltage
VEN Rising
1.4
IEN
Enable pin current
Sink / Source
10
nA
ISW
Switch leakage
VIN = 20 V
100
nA


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