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TPS62684 Datasheet(PDF) 6 Page - Texas Instruments

No. de Pieza. TPS62684
Descripción  1600-mA, High-Efficiency Step-Down Converter Optimized for Smallest Solution Size
Descarga  27 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS62684 Datasheet(HTML) 6 Page - Texas Instruments

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TPS62684
SLVSAC5 – APRIL 2014
www.ti.com
7.5 Electrical Characteristics
Minimum and maximum values are at VI = 3.25V to 5.5V, EN = VIN and TA = –40°C to 85°C; Circuit of Parameter
Measurement Information section (unless otherwise noted). Typical values are at VIN = 3.6V, EN = VIN and TA = 25°C
(unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY CURRENT into VIN + AVIN
IQ
Operating quiescent current
IO = 0mA
5.8
mA
ISD
Shutdown current
EN = low; not including high side MOSFET leakage
0.2
1.5
μA
VIN rising
2.1
2.3
V
VUVLO
Undervoltage lockout threshold
VIN falling
1.95
2.1
V
ENABLE
VIH
High-level input voltage
0.9
V
VIL
Low-level input voltage
0.4
V
Ilkg,EN
Input leakage current
EN connected to GND or VIN; TJ = –40°C to 85°C
0.01
0.1
μA
POWER SWITCH
VIN = 3.6V; TJ = –40°C to 125°C
95
155
m
RDS(on),HS
High Side MOSFET on resistance
VIN = 2.5V
170
m
Ilkg,HS
High Side MOSFET leakage current
VIN = 5.5V; TJ = –40°C to 85°C
2.6
μA
VIN = 3.6V; TJ = –40°C to 125°C
75
155
m
RDS(on),LS
Low Side MOSFET on resistance
VIN = 2.5V
100
m
Ilkg,LS
Low Side MOSFET leakage current
VIN = 5.5V; TJ = –40°C to 85°C
1
μA
Resistor in parallel to Low Side
250
k
MOSFET
Discharge resistor for power-down
only active after a first power-up (EN = high to low
RDIS
12
sequence
after VIN applied)
Average High Side MOSFET current
1680
2100
2850
mA
limit
Input current limit under short-circuit
VOUT shorted to ground
150
mA
conditions
Thermal shutdown
Temperature rising
140
°C
Thermal shutdown hysteresis
Temperature falling
10
°C
OSCILLATOR
fSW
Nominal oscillator frequency
IOUT = 0mA
5.5
MHz
OUTPUT
VOUT,nom
Nominal output voltage
2.85
V
0.98×VOUT,N
1.02×VOUT,N
Output voltage accuracy
3.25V
≤ VIN ≤ 3.85V, 0mA ≤ IO ≤ 960 mA
VOUT,NOM
V
OM
OM
0.98×VOUT,N
1.02×VOUT,N
3.85V
≤ VIN ≤ 5.5V, 0mA ≤ IO ≤ 1600 mA
VOUT,NOM
V
OM
OM
Line regulation
VIN = VOUT + 0.5V (min 3.25V) to 5.5V, IO = 200 mA
0.2
%/V
Load regulation
IO = 0mA to 1600 mA
–0.00085
%/mA
FB pin input resistance
1.4
M
7.6 Timing Requirements
MIN
TYP
MAX
UNIT
IO = 0mA, Time from EN = high to start
Start-up delay time
120
300
µs
switching
tRAMP
IO = 0mA, Time from start switching until 95% of
ramp time
150
µs
nominal output voltage
IO = 0mA, Time from EN = low to VO < 500mV,
Shutdown time
300
µs
Effective Output Capacitance CO_effective = 5µF
6
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