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LM25088 Fiches technique(PDF) 4 Page - Texas Instruments

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No de pièce LM25088
Description  Wide Input Range Non-Synchronous Buck Controller
Download  33 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM25088 Fiches technique(HTML) 4 Page - Texas Instruments

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LM25088
SNVS609G – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
Electrical Characteristics
Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C
to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent
at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VVIN =
24V, VVCC= 8V, VEN = 5V RRT = 31.6 kΩ, No load on HG. See note
(1).
Symbol
Parameter
Conditions
Min
Typ(1)
Max
Units
VIN SUPPLY
IBIAS
VIN Operating Current
VFB = 1.3V
3.2
4.5
mA
ISTANDBY
VIN Standby Current
VEN = 1V
2.5
3.0
mA
ISHUTDOWN
VIN Shutdown Current
VEN = 0V
14
24
µA
VCC REGULATOR
VVCC(Reg)
VCC Regulation
VVCC = open
7.4
7.8
8.2
V
VVCC(Reg)
VCC Regulation
VVIN = 4.5V,VVCC=open
4.3
4.5
V
VCC Sourcing Current Limit
VVCC = 0
25
30
mA
VVCC(UV)
VCC Under-Voltage Lockout Threshold
Positive going VVCC
3.7
4
4.2
V
VCC Under-Voltage Hysteresis
200
mV
ENABLE THRESHOLDS
EN Shutdown Threshold
VEN Rising
320
400
480
mV
EN Shutdown Hysteresis
VEN Falling
100
mV
EN Standby Threshold
VEN Rising
1.1
1.2
1.3
V
EN Standby Hysteresis
VEN Falling
120
mV
EN Pull-up Current Source
VEN = 0V
5
µA
SOFT- START
SS Pull-up Current Source
VSS = 0V
8
11
13
µA
FB to SS Offset
VFB = 1.3V
150
mV
ERROR AMPLIFIER
VREF
FB Reference Voltage
Measured at FB Pin
1.187
1.205
1.223
V
FB = COMP
FB Input Bias Current
VFB = 1.2V
18
100
nA
COMP Sink/Source Current
3
mA
AOL
DC Gain
60
dB
FBW
Unity gain bandwidth
3
MHz
PWM COMPARATORS
THG(OFF)
Forced HG Off-time
185
280
365
ns
TON(MIN)
Minimum HG On-time
VVIN = 36V
55
ns
COMP to PWM comparator offset
930
mV
OSCILLATOR (RT Pin)
LM25088-2 (Non-Dithering)
Fnom1
Nominal Oscillator Frequency
RRT =31.6 kΩ
180
200
220
kHz
Fnom2
RRT = 11.3 kΩ
430
500
565
kHz
LM25088-1 (Dithering)
Fmin
Dithering Range
Minimum Dither Frequency
Fnom-5%
kHz
Fmax
Maximum Dither Frequency
Fnom+5%
kHz
SYNC
SYNC positive threshold
2.3
V
SYNC Pulse Width
15
150
ns
CURRENT LIMIT
VCS(TH)
Cycle by cycle sense voltage threshold
VRAMP = 0V
112
120
136
mV
Cycle by Cycle Current Limit Delay
VRAMP = 2.5V
280
ns
(1)
Typical specifications represent the most likely parametric norm at 25°C operation.
4
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