Power-Up Logic. MAX4919B Datasheet

MAX4919B Logic. Datasheet pdf. Equivalent

MAX4919B Datasheet
Recommendation MAX4919B Datasheet
Part MAX4919B
Description Battery Power-Up Logic
Feature MAX4919B; MAX4919B/MAX4920B/MAX4921B 19-0614; Rev 0; 8/06 Battery Power-Up Logic with Overvoltage and Overcu.
Manufacture Maxim Integrated
Datasheet
Download MAX4919B Datasheet




Maxim Integrated MAX4919B
19-0614; Rev 0; 8/06
Battery Power-Up Logic with Overvoltage
and Overcurrent Protection
General Description
The MAX4919B/MAX4920B/MAX4921B overvoltage
protection controllers protect low-voltage systems
against high-voltage faults up to +28V. An internal 1.8A
(min) pFET with low RON (100m) switches a battery to
the load and also protects the battery against short-cir-
cuit faults. When a short circuit occurs, the current
through the internal pFET is limited for a blanking peri-
od. If the short condition is present after the blanking
period, the switch is latched off and remains off until
one of the input signals (IN, HP_PWR, PWR_ON) is
cycled. The pFET is turned on by a logic-high voltage
at PWR_HOLD, HP_PWR, PWR_ON, or IN .
The overvoltage thresholds (OVLO) are preset to
+6.38V (MAX4919B), +5.80V (MAX4920B), and +4.65V
(MAX4921B). When the input voltage drops below the
undervoltage lockout (UVLO) threshold, the devices enter
a low-current standby mode. In shutdown mode, the
current is reduced to 0.4µA. The MAX4919B/MAX4920B
have a +4.27V UVLO threshold, and the MAX4921B has
a +2.35V UVLO threshold.
The MAX4919B/MAX4920B/MAX4921B are offered in a
small 14-pin TDFN package (3mm x 3mm) with an
exposed paddle and are specified over the extended
-40°C to +85°C temperature range.
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
Features
o Input Overvoltage Protection Up to +28V
o Preset Overvoltage Protection Trip Level
6.38V (MAX4919B)
5.80V (MAX4920B)
4.65V (MAX4921B)
o Adapter/Car-Kit Auto-Selector
o Low-Current Undervoltage Lockout Mode
o Internal 1.8A (min) Battery Switchover FET
o Integrated Low-Battery Detect
o Battery Short-Circuit Protection
o Low-Cost External nMOS Overvoltage FET
o 14-Pin TDFN Package (3mm x 3mm)
Pin Configuration
TOP VIEW
14 13 12 11 10 9 8
MAX4919B
MAX4920B
MAX4921B
+ *EP
1234567
TDFN (3mm x 3mm)
*EXPOSED PADDLE
+DENOTES LEAD-FREE PACKAGE
Ordering Information/Selector Guide
PART
PIN-
PACKAGE
OVLO (V)
UVLO (V)
MAX4919BETD+T
14 TDFN-EP*
6.38
4.27
MAX4920BETD+T
14 TDFN-EP*
5.80
4.27
MAX4921BETD+T
14 TDFN-EP*
4.65
2.35
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes lead-free package.
*EP = Exposed paddle.
TOP MARK
ABY
ABZ
ACA
PKG CODE
T1433-2
T1433-2
T1433-2
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.



Maxim Integrated MAX4919B
Battery Power-Up Logic with Overvoltage
and Overcurrent Protection
ABSOLUTE MAXIMUM RATINGS
IN to GND ...............................................................-0.3V to +30V
GP1, GN1 to GND ..................................................-0.3V to +12V
IN to GP1 ................................................................-0.3V to +20V
BTO to GND ..........................................................-0.3V to +6.1V
BTI to BTO ................................................................-0.3V to +6V
BTI, ACOK, PWR_ON, EN to GND ...........................-0.3V to +6V
HP_PWR, ONOK, PWR_HOLD to GND ....................-0.3V to +6V
Continuous Power Dissipation (TA = +70°C)
14-Pin TDFN (derate 18.5mW/°C above +70°C) .......1482mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 5V (MAX4919B/MAX4920B) or VIN = 4.2V (MAX4921B), VBTI = 4V, TA = -40°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
Input Supply Current
VIN
MAX4919B/MAX4920B
IIN MAX4921B
1.2 28 V
77 120
µA
75 110
UVLO Supply Current
Shutdown Supply Current
IN Undervoltage Lockout
IUVL
ISHDN
VUVLO
VEN = 0V; VIN = 3.9V; MAX4919B/MAX4920B
VEN = 0V; VIN = 2.1V; MAX4921B
VEN = 1.6V, VIN = 3.6V
VIN falling
MAX4919B/MAX4920B
MAX4921B
4.00
2.20
10
8
0.4
4.27
2.35
22
18
2
4.54
2.50
µA
µA
V
V
IN Undervoltage Lockout
Hysteresis
1%
Overvoltage Trip Level
VOVLO VIN rising
MAX4919B
MAX4920B
MAX4921B
6.00 6.38 6.76
5.44 5.80 6.17
4.35 4.65 4.95
V
IN Overvoltage Lockout
Hysteresis
1%
BATTERY SWITCHOVER
BTI Input Range
BTI UVLO
BTI UVLO Hysteresis
VBTI
VUVBTI
VBTI falling
2.30 5.50
2.0 2.15 2.3
1.5
V
V
%
BTI Low-Battery Threshold
BTI Low-Battery Hysteresis
VLVBTI VBTI falling
2.65 2.82
1.5
3
V
%
BTI Supply Current
Adapter out, VPWR_HOLD = high,
EN = high
7 µA
BTI Shutdown Current
INTERNAL pFET
VBTO = 0V
TA = +25°C
TA = -40°C to +85°C
2
µA
2.8
Switch On-Resistance
Forward-Overload Current Limit
RON
ILIM
VBTI = 2.7V, IBTI to
BTO = 0.5A
BTO shorted to GND
TA = +25°C
TA = -40°C to +85°C
1.8
100
m
120
A
2 _______________________________________________________________________________________



Maxim Integrated MAX4919B
Battery Power-Up Logic with Overvoltage
and Overcurrent Protection
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 5V (MAX4919B/MAX4920B) or VIN = 4.2V (MAX4921B), VBTI = 4V, TA = -40°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
GATE DRIVERS
GN1 Turn-On Voltage
VGN1
VGN1 referenced to GND, IGN1 sourcing 1µA;
MAX4919B/MAX4920B
VGN1 referenced to GND, IGN1 sourcing 1µA;
MAX4921B
9
7.8
10
V
8.4
GN1 Pulldown Current
IGPD VIN > OVLO, VGN1 = 5.5V
GP1 Clamp Voltage
VCLAMP VIN - VGP1 when VIN = 28V
GP1 Pulldown Resistor
RGPD
LOGIC INPUTS (PWR_HOLD, HP_PWR, PWR_ON, EN)
Input-High Voltage
VIH VBTI = 5.50V
Input-Low Voltage
VIL
VBTI = 2.3V for PWR_HOLD, HP_PWR and
EN; VBTI = 3V for PWR_ON
PWR_HOLD, EN Input Leakage
Current
ILKG EN, PWR_HOLD = GND or 5.5V
30
12.5 16.5 19.5
31 51.5 72
1.5
0.4
-1 +1
mA
V
k
V
V
µA
PWR_ON, HP_PWR Pulldown
Resistance
LOGIC OUTPUTS (ACOK, ONOK)
Output-Low Voltage
Output-High Leakage Current
TIMING
RIPD
VOL
ISINK = 1mA
200 k
0.4 V
1 µA
IN Debounce Time
ACOK Blanking Time
tINDBC
tBLNKAC
Time from UVLO < VIN < OVLO to VGN1 >
0.3V, CGN1 = 500pF
Time from VGN1 > 0.3V to ACOK low,
CGN1 = 500pF
10 25 40 ms
10 25 40 ms
HP_PWR Debounce Time
tHPDBC
Time for internal pFET to turn on after
VHP_PWR > VIH
10 25 40 ms
ACOK One-Shot Time
t1SHAC
VPWR_HOLD = 0V; time for internal pFET to
turn off after ACOK < VOL (Figure 1)
488 1220 1952
ms
HP_PWR One-Shot Time
t1SHHP
VPWR_HOLD = 0V; time for internal pFET to
turn off after VHP_PWR > VIH (Figure 2)
488 1220 1952
ms
Current-Limit Blanking Time
tCLIM
VBTI = 2.7V; VBTO shorted to GND; time for
internal pFET current to reduce to 10mA
4
10 16 ms
GN1 Turn-On Time
tGON
VGN1 = 0.3V to 8V
(MAX4919B/MAX4920B),
VGN1 = 0.3V to 7V (MAX4921B),
CGN1 = 500pF
10 ms
_______________________________________________________________________________________ 3







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