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LM3262TME Arkusz danych(PDF) 6 Page - Texas Instruments

Numer części LM3262TME
Szczegółowy opis  Adjustable, Step-Down DC-DC Converter With Auto Bypass
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LM3262
SNVS875O – AUGUST 2012 – REVISED DECEMBER 2015
www.ti.com
6.6 System Characteristics
The following parameters are specified by design and verifications providing the component values in the Typical Application
Circuit are used. These parameters are not verified by production testing. Minimum (MIN) and maximum (MAX) values are
specified over the ambient temperature range TA = −30°C ≤ TA ≤ +90°C and over the VIN range = 2.5 V to 5.5 V, unless
otherwise specified; L = 0.5
μH, DCR = 50 mΩ, CIN = 10 μF, 6.3 V, 0402 (1005), COUT = 4.7 μF, 6.3 V, 0402 (1005). For
bench evaluation, see
(1).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
D
Maximum duty cycle
MODE = LOW
100%
2.5 V
≤ VIN ≤ 5.5 V
800
2.5 × VCON
≤ VIN – 285 mV
Maximum output current
IOUT
mA
2.5 V
≤ VIN ≤ 5.5 V
capability
2.5 × VCON
≤ VIN – 165 mV, bypass
1000
mode
–3%
3%
VOUT linearity
VCON = 0.16 V to 1.44 V
0 mA
≤ IOUT ≤ 800 mA
(2)
–50
50
mV
VIN = 3.8 V, VOUT = 0.8 V
71%
IOUT = 10 mA, ECO mode
VIN = 3.8 V, VOUT = 2.5 V
η
Efficiency
92%
IOUT = 200 mA, PWM mode
VIN = 3.8 V, VOUT = 3.4 V
93%
IOUT = 500 mA, PWM mode
VIN = 3.6 V to 4.2 V, TR = TF = 10 µs,
LINE_tr
Line transient response
50
mVpk
IOUT = 100 mA, VOUT = 0.8 V
VIN = 3.1/3.6/4.5 V, VOUT = 0.8 V
LOAD_tr
Load transient response
IOUT = 50 mA to 150 mA
50
mVpk
TR = TF = 10 µs,
(1)
When the LM3262 device is being evaluated apart from a normal system design or on a PCB other than the TI LM3262 evaluation
module, user should ensure that a 50-µF to 100-
μF ceramic input capacitor is added to the PCB to keep input voltage from sagging
during rapid load transitions.
(2)
Linearity limits are ±3% or ±50 mV, whichever is larger. VOUT is monotonic in nature with respect to VCON input.
6.7 Timing Requirements
MIN
NOM
MAX
UNIT
VOUT rise time VCON change to 90%; VIN = 3.7 V, VOUT = 1.4 V to 3.4 V
5
µs
0.1 µs < VCON_TR < 1 µs, RL = 12 Ω
TVCON_TR
VOUT fall time VCON change to 10%; VIN = 3.7 V, VOUT = 3.4 V to 1.4 V
5
µs
0.1 µs < VCON_TR < 1 µs, RL = 12 Ω
Turnon time (time for output to reach 95% final value after Enable low-to-
high transition)
TON
50
µs
EN = low-to-high, VIN = 4.2 V , VOUT = 3.4 V
IOUT ≤ 1 mA, COUT = 4.7 µF
TBP, NEG
Auto bypass detect negative threshold delay time(1)
10
µs
TBP, POS
Auto bypass detect positive threshold delay time(2)
0.1
µs
(1)
Entering bypass mode, VIN is compared to the programmed output voltage (2.5 × VCON). When VIN − (2.5 × VCON) falls below VBP,
NEG longer than TBP, NEG, the bypass FET turns on, and the switching FET turns on.
(2)
Bypass mode is exited when VIN − (2.5 × VCON) exceeds VBP, POS longer than TBP, POS, and PWM mode resumes. The hysteresis for
the bypass detection threshold VBP, POS − VBP, NEG is always positive and will be approximately 50 mV.
6
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