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LP8728-Q1 Datasheet(PDF) 6 Page - Texas Instruments

Part # LP8728-Q1
Description  LP8728-Q1 Quad-Output Step-Down DC/DC Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8728-Q1 Datasheet(HTML) 6 Page - Texas Instruments

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LP8728-Q1
SNVS972B – AUGUST 2013 – REVISED DECEMBER 2014
www.ti.com
6.5 Electrical Characteristics
(1) (2)
Unless otherwise noted, VIN = 5 V, typical values apply for TA = 25°C, and minimum/maximum limits apply over junction
temperature range, TJ = –40°C to 125°C.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Shutdown supply current into power
ISHDN
EN_Bx = 0 V
1
6
μA
connections
IOP
Operating current
All buck-converters active, IOUT = 0 mA
20
mA
LOGIC INPUTS (EN_Bx, DEFSEL)
VIL
Input low level
0.4
V
VIH
Input high level
1.6
V
EN_Bx and DEFSEL internal pull-
RPD_DI
300
520
820
k
Ω
down resistance
TH_MIN
Minimum EN_Bx high time
1
ms
TL_MIN
Minimum EN_Bx low time
10
µs
LOGIC OUTPUTS (PG_Bx)
VOL
Output low level
ISINK = 3 mA
0.4
V
RPU
Recommended pull-up resistor
10
k
Ω
BUCK CONVERTERS
VOUT1
Output voltage for Buck 1
Fixed voltage
3.3
V
VOUT2
Output voltage for Buck 2
Fixed voltage
1.25
V
DEFSEL = 1
2.65
VOUT3
Output voltage for Buck 3
V
DEFSEL = 0
1.8
VOUT4
Output voltage for Buck 4
Fixed voltage
1.8
V
VFB_Bx
Output voltage accuracy
–3%
3%
Line regulation
4.5 V
≤ VIN_Bx ≤ 5.5 V ILOAD = 10 mA
3
mV
ΔVOUT
Load regulation
VIN = 5 V 100 mA ≤ ILOAD ≤ 900 mA
3
mV
DC load
IOUT
Output current
1000
mA
TA = 25°C.
FSW
Switching frequency
3.03
3.2
3.37
MHz
GBW
Gain bandwidth
300
kHz
ILIMITP
High side switch current limit
1200
1500
1800
mA
ILIMITN
Low side switch current limit
Reverse current
500
mA
RDSONP
Pin-pin resistance for PFET
IOUT = 200 mA
210
300
m
Ω
RDSONN
Pin-pin resistance for NFET
IOUT = 200 mA
140
240
m
Ω
ILK_SW
Switch pin leakage current
VOUT = 1.8V
1
µA
Pull-down resistor from FB_Bx pin to
Only active when converter disabled.
RPD_FB
40
70
100
Ω
GND
All limits apply for TA = 25°C.
KRAMP
Slew rate control
DEFSEL from 0 to 1
10
mV/µs
Time from first EN_Bx high to start of
TSTART
Start-up time
420
µs
switching
KSTART
Soft-start VOUT slew rate
18
mV/µs
VOLTAGE MONITORING
Power good threshold for voltage rising
93.5%
96%
98%
VPG
Power good threshold voltage
Power good threshold for voltage falling
91%
93%
95%
Voltage monitored on AVDD Pin,
V
5.5
5.7
5.9
Input overvoltage protection trigger
voltage rising
VOVP
point
Hysteresis
80
mV
(1)
All voltage values are with respect to network ground terminal.
(2)
Minimum (Min) and Maximum (Max) limits are specified by design, test, or statistical analysis. Typical (Typ) numbers are not verified, but
do represent the most likely norm. Unless otherwise specified, conditions for Typ specifications are: VIN = 5 V and TJ = 25°C.
6
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