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LM3205 数据表(PDF) 4 Page - Texas Instruments

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部件名 LM3205
功能描述  Miniature, Adjustable, Step-Down DC-DC Converter
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM3205 数据表(HTML) 4 Page - Texas Instruments

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LM3205
SNVS388E – JULY 2005 – REVISED APRIL 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
(1) (2) (3)
Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature
range (
−30°C ≤ TA = TJ ≤ +85°C). Unless otherwise noted, all specifications apply to LM3205TL/LM3205SD with: PVIN = VDD
= EN = 3.6V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VFB, MIN
Feedback Voltage at
VCON = 0.32V
(3)
0.75
0.8
0.85
V
minimum setting
VFB, MAX
Feedback Voltage at
VCON = 1.44V, VIN = 4.2V
(3)
3.537
3.6
3.683
V
maximum setting
ISHDN
Shutdown supply current
EN = SW = VCON = 0V
(4)
0.01
2
µA
IQ
DC bias current into VDD
VCON = 2V, FB = 0V, No Switching
(5)
1
1.4
mA
RDSON(P) DSBGA
Pin-pin resistance for PFET
ISW = 200mA
200
140
m
230
RDSON(N) DSBGA
Pin-pin resistance for NFET ISW = -200mA
415
300
m
485
RDSON(P)WSON
Pin-pin resistance for PFET
ISW = 200mA
230
170
m
260
RDSON(N)WSON
Pin-pin resistance for NFET ISW = -200mA
445
330
m
515
ILIM,PFET
Switch peak current limit
See(6)
935
1100
1200
mA
FOSC
Internal oscillator frequency
1.7
2
2.3
MHz
VIH,EN
Logic high input threshold
1.2
V
VIL,EN
Logic low input threshold
0.5
V
IPIN,EN
Pin pull down current
5
10
µA
ZCON
VCON input resistance
100
k
Gain
VCON to VOUT Gain
0.32V
≤ VCON ≤ 1.44V
2.5
V/V
(1)
All voltages are with respect to the potential at the GND pins. The LM3205 is designed for mobile phone applications where turn-on after
power-up is controlled by the system controller and where requirements for a small package size overrule increased die size for internal
Under Voltage Lock-Out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin low until the input voltage exceeds
2.7V.
(2)
Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the most
likely norm. Due to the pulsed nature of the testing TA = TJ for the electrical characteristics table.
(3)
The parameters in the electrical characteristics table are tested under open loop conditions at PVIN = VDD = 3.6V. For performance over
the input voltage range and closed loop results refer to the datasheet curves.
(4)
Shutdown current includes leakage current of PFET.
(5)
IQ specified here is when the part is operating at 100% duty cycle.
(6)
Current limit is built-in, fixed, and not adjustable. 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 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%.
4
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