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LM2770 Fiches technique(PDF) 5 Page - Texas Instruments

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No de pièce LM2770
Description  High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

LM2770 Fiches technique(HTML) 5 Page - Texas Instruments

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LM2770
www.ti.com
SNVS318E – NOVEMBER 2004 – REVISED MAY 2013
Electrical Characteristics
(1)(2) (continued)
Limits in standard typeface are for TJ = 25ºC. Limits in boldface type apply over the full operating junction temperature range
(-30°C
≤ TJ ≤ +105°C) . Unless otherwise noted, specifications apply to the LM2770 Typical Application Circuit (pg. 1) with:
VIN = 3.6V; V(EN) = VSEL = 1.8V, V(SLEEP) = 0V, CIN = COUT = 10µF, C1 = C2 = 1.0µF.
(3)
Symbol
Parameter
Condition
Min
Typ
Max
Units
Specifications Below Apply to All LM2770 Options
VIN = 3.6V, IOUT = 150mA
E
Power Efficiency
82
%
VOUT =1.5V
Average Eficiency over Li-Ion Input 3.0V
≤ VIN ≤ 4.2V
EAVG
73
%
Voltage Range(4)
IOUT = 200mA, VOUT = 1.5V
2.7V
≤ VIN ≤ 5.5V
Quiescent Supply Current: Full-
IQ
IOUT = 0mA
55
75
µA
power Mode
V(SLEEP) = 0V
2.7V
≤ VIN ≤ 5.5V
Quiescent Supply Current: Sleep
ISLEEP
IOUT = 0mA
50
65
µA
Mode
V(SLEEP) = 1.8V
2.7V
≤ VIN ≤ 5.5V
ISD
Shutdown Current
0.1
0.5
µA
V(EN) = 0V
0V
≤ VOUT ≤ 0.2V
ICL
Current Limit - Sleep Mode
60
mA
V(SLEEP) = 1.8V
tON
Turn-on Time
VIN = 3.6V, COUT = 10µF
200
µs
FSW
Switching Frequency
2.7V
≤ VIN ≤ 5.5V
475
700
925
kHz
Logic Pin Specifications: EN, ENA, ENB
VIL
Logic-low Input Voltage
2.7V
≤ VIN ≤ 5.5V
0
0.4
V
VIH
Logic-high Input Voltage
2.7V
≤ VIN ≤ 5.5V
1.0
VIN
V
Logic-high Input Current: SLEEP
IIH
Logic Input = 3.0V
0.1
µA
and VSEL pins
IIH-EN
Logic-high Input Current: EN pin(5)
V(EN) = 1.8V
6
µA
Logic-low Input Current: All Logic
IIL
Logic Input = 0V
0
µA
Pins
(4)
Efficiency is measured versus VIN, with VIN being swept in small increments from 3.0V to 4.2V. The average is calculated from these
measurement results. Weighting to account for battery voltage discharge characteristics (VBAT vs. Time) is not done in computing the
average.
(5)
There is a 300k
Ω pull-down resistor connected internally between the EN pin and GND.
Copyright © 2004–2013, Texas Instruments Incorporated
Submit Documentation Feedback
5
Product Folder Links: LM2770


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