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LM3673 Datenblatt(PDF) 4 Page - Texas Instruments

Teilenummer LM3673
Bauteilbeschribung  2MHz, 350mA Step-Down DC-DC Converter
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LM3673
SNVS434J – JULY 2006 – REVISED NOVEMBER 2006
www.ti.com
Electrical Characteristics
(1) (2) (3)
Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature range
(
−30°C ≤ TA ≤ +85°C). Unless otherwise noted, specifications apply to the LM3673TL with VIN = EN = 3.6V
Symbol
Parameter
Condition
Min
Typ
Max
Units
VIN
Input Voltage
(4)
2.7
5.5
V
VFB
Feedback Voltage (Fixed / ADJ) TL
PWM mode (5)
-2.5
+2.5
%
Line Regulation
2.7V
≤ VIN ≤ 5.5V
0.025
%/V
IO = 20 mA
Load Regulation
150 mA
≤ IO ≤ 350 mA
0.0015
%/mA
VIN= 3.6V
VREF
Internal Reference Voltage
0.5
V
ISHDN
Shutdown Supply Current
EN = 0V
0.01
1
µA
IQ
DC Bias Current into VIN
No load, device is not switching (FB
16
35
µA
forced higher than programmed
output voltage)
RDSON (P)
Pin-Pin Resistance for PFET
VIN= VGS= 3.6V
350
450
m
RDSON (N)
Pin-Pin Resistance for NFET
VIN= VGS= 3.6V
150
250
m
ILIM
Switch Peak Current Limit
Open Loop (6)
590
750
855
mA
VIH
Logic High Input
1.0
V
VIL
Logic Low Input
0.4
V
IEN
Enable (EN) Input Current
0.01
1
µA
FOSC
Internal Oscillator Frequency
PWM Mode (5)
1.6
2
2.6
MHz
(1)
All voltages are with respect to the potential at the GND pin.
(2)
Min and Max limits are guaranteed by design, test or statistical analysis. Typical numbers are not guaranteed, but do represent the most
likely norm.
(3)
The parameters in the electrical characteristic table are tested at VIN= 3.6V unless otherwise specified. For performance over the input
voltage range refer to datasheet curves.
(4)
The input voltage range recommended for ideal applications performance for the specified output voltages are given below:VIN = 2.7V to
4.5V for 1.1V
≤ VOUT < 1.5VVIN = 2.7V to 5.5V for 1.5V ≤ VOUT < 1.8VVIN = (VOUT+ VDROPOUT) to 5.5V for 1.8V ≤ VOUT ≤ 3.3Vwhere
VDROPOUT = ILOAD *( RDSON, PFET + RINDUCTOR)
(5)
Test condition: for VOUT less than 2.5V, VIN = 3.6V; for VOUT greater than or equal to 2.5V, VIN = VOUT + 1V.
(6)
Refer to datasheet curves for closed loop data and its variation with regards to supply voltage and temperature. Electrical Characteristic
table reflects open loop data (FB=0V and current drawn from SW pin ramped up until cycle by cycle current limit is activated). Closed
loop current limit is the peak inductor current measured in the application circuit by increasing output current until output voltage drops
by 10%.
Electrical Characteristics
(1) (2) (3) Dissipation Rating Table
θJA
TA≤ 25°C
TA= 60°C
TA= 85°C
Power Rating
Power Rating
Power Rating
85°C/W (4 layer board) 5-Bump
1179mW
765mW
470mW
MicroSMD
(1)
All voltages are with respect to the potential at the GND pin.
(2)
Min and Max limits are guaranteed by design, test or statistical analysis. Typical numbers are not guaranteed, but do represent the most
likely norm.
(3)
The parameters in the electrical characteristic table are tested at VIN= 3.6V unless otherwise specified. For performance over the input
voltage range refer to datasheet curves.
4
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Copyright © 2006, Texas Instruments Incorporated
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