19-0885; Rev 0; 8/07
KIT
ATION
EVALU
BLE
AVAILA
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
General Description
Features
♦
16V-Tolerant USB and DC Inputs
♦
Automatically Powers from External Power or
Battery
♦
Operates with No Battery Present
♦
Single-Cell Li+/Li-Poly Charger
♦
Three 2MHz Step-Down Regulators
Up to 96% Efficiency
♦
Two Low I
Q
Linear Regulators
♦
Output Power-Up Sequencing
♦
Thermal-Overload Protection
MAX8671X
The MAX8671X integrated power-management IC
(PMIC) is ideal for use in portable media players and
other handheld devices. In addition to five regulated
output voltages, the MAX8671X integrates a 1-cell lithi-
um ion (Li+) or lithium polymer (Li-Poly) charger and
Smart Power Selector™ with dual (AC-to-DC adapter
and USB) power inputs. The dual-input Smart Power
Selector supports end products with dual or single
power connectors. All power switches for charging and
switching the system load between battery and external
power are included on-chip. No external MOSFETs are
required.
Maxim’s Smart Power Selector makes the best use of
limited USB or AC-to-DC adapter power. Battery
charge current and input current limit are independent-
ly set. Input power not used by the system charges the
battery. Charge current and DC current limit are pro-
grammable up to 1A while USB input current can be set
to 100mA or 500mA. Automatic input selection switches
the system load from battery to external power. Other
features include overvoltage protection, charge status
and fault outputs, power-OK monitors, charge timer,
and battery thermistor monitor. In addition, on-chip
thermal limiting reduces battery charge rate to prevent
charger overheating.
The MAX8671X offers adjustable voltages for all out-
puts. Similar parts with factory-preset output voltages
are also available (contact factory for availability).
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
40 Thin QFN-EP*
5mm x 5mm
PKG
CODE
T4055-1
MAX8671XETL+ -40°C to +85°C
+Denotes
a lead-free package.
*EP
= Exposed paddle.
Simplified Applications Circuit
MAX8671X
Applications
Portable Audio Players
GPS Portable Navigators
AC-TO-DC
ADAPTER
DC
SYS
USB
ON
OFF
USB
+
EN
PWM
OUT1
OUT1
1V TO V
SYS
425mA
OUT2
1V TO V
SYS
425mA
OUT3
1V TO V
SYS
425mA
Li+/LiPo
BATTERY
PEN1
PEN2
USUS
CEN
μP
CST1
CST2
DOK
UOK
OUT2
OUT3
OUT4
OUT4
0.6V TO V
SYS
180mA
OUT5
0.6V TO V
SYS
180mA
OUT5
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MAX8671X
Table of Contents
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Simplified Applications Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Smart Power Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
System Load Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
USB Power Input (USB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
USB Power-OK Output (UOK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
USB Suspend (USUS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DC Power Input (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DC Power-OK Output (DOK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Battery Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Battery Regulation Voltage (BVSET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Charge Enable Input (CEN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Charge Status Outputs (CST1, CST2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Charge Timer (CT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Setting The Charger Currents (CISET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Step-Down Converters (REG1, REG2, REG3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PWM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Step-Down Dropout and Minimum Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Step-Down Input Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Step-Down Output Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Step-Down Inductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Step-Down Converter Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Linear Regulators (REG4, REG5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
VL Linear Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Enable/Disable (EN) and Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Soft-Start/Inrush Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Active Discharge in Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Undervoltage and Overvoltage Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
USB/DC UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
USB/DC OVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
SYS UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
REG4/REG5 UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Thermal Limiting and Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Smart Power Selector Thermal-Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Regulator Thermal-Overload Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Battery Charger Thermistor Input (THM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
PCB Layout and Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Package Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Chip Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
2
_______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Table of Contents (continued)
Tables
Table 1. Input Limiter Control Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 2. DC Current Limit for Standard Values of R
DISET
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 3. Charge Status Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 4. Charge Times vs. C
CT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 5. Ideal Charge Currents vs. Charge Setting Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 6. Suggested Inductors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 7. 5mm x 5mm x 0.8mm Thin QFN Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 8. Trip Temperatures for Different Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figures
Figure 1. MAX8671X Typical Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 2. Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 3. USB Power-OK Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 4. Programming DC Current Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 5. DC Power-OK Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 6. Li+/Li-Poly Charge Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 7. Charger State Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 8. Programming Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 9. Monitoring the Battery Charge Current with the Voltage from CISET to AGND . . . . . . . . . . . . . . . . . . 32
Figure 10. Step-Down Converter Maximum Output Current Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 11. Enable/Disable Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 12. Enable and Disable Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 13. REG5 Disable Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 14. Thermistor Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 15. Package Marking Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
MAX8671X
_______________________________________________________________________________________
3
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
MAX8671X
ABSOLUTE MAXIMUM RATINGS
USB, DC, PEN1 to AGND.......................................-0.3V to +16V
SYS, BAT, PV1, PV2, PV3 to AGND..........................-0.3V to +6V
PG1, PG2, PG3, AGND .........................................-0.3V to +0.3V
PV1, PV2, PV3 to SYS............................................-0.3V to +0.3V
VL to AGND ...........................................................-0.3V to +4.0V
CISET, DISET, BVSET, CT, THM to AGND..-0.3V to (V
VL
+ 0.3V)
PV4, PV5, BP, FB1, FB2, FB3 to AGND ....-0.3V to (V
SYS
+ 0.3V)
PEN2, USUS,
CEN,
EN, PWM to AGND ..................-0.3V to +6V
CST1, CST2,
DOK, UOK
to AGND ...........................-0.3V to +6V
OUT4, FB4 to AGND .................................-0.3V to (V
PV4
+ 0.3V)
OUT5, FB5 to AGND .................................-0.3V to (V
PV5
+ 0.3V)
LX1, LX2, LX3 Continuous RMS Current (Note 1).................1.5A
BAT Continuous Current .......................................................1.5A
SYS Continuous Current .......................................................1.5A
Continuous Power Dissipation (T
A
= +70°C)
40-Pin, 5mm x 5mm, Thin QFN (derate 35.7mW/°C
above +70°C)..............................................................2857mW
Operating Junction Temperature.....................................+150°C
Storage Junction Temperature Range ..............-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
LX_ has internal clamp diodes to PG_ and PV_. Applications that forward bias these diodes must take care not to exceed
the package power dissipation limits.
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
(DC, USB, BVSET,
UOK, DOK,
LX_ unconnected; V
THM
= V
L
/2, V
PG_
= V
AGND
= 0V, V
BAT
= 4V,
CEN
= low, USUS = low, EN = high,
V
PEN1
= V
PEN2
= 3.3V, V
PWM
= 0V, C
OUT4
= 1µF, C
OUT5
= 1µF, C
SYS
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
DISET
= 3kΩ,
R
CISET
= 3kΩ, C
VL
= 0.1µF, C
CT
= 0.15µF, C
BP
= 0.01µF, V
FB1
= 1.1V, V
FB2
= 1.1V, V
FB3
= 1.1V, T
A
= -40°C to +85°C, unless other-
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Operating voltage
Withstand voltage
V
DC
= 6V, USUS = low,
CEN
= high, system
current is less than the input current limit
V
DC
rising, 500mV typical hysteresis
V
DC
rising, 400mV typical hysteresis
PEN1 = low,
V
DC
= 6V, V
SYS
= 5V PEN2 = low,
USUS = low
USB unconnected,
CEN
= low,
PEN1 = low,
T
A
= +25°C,
PEN2 = high,
VL = no load
USUS = low
(Note 3)
PEN1 = high,
R
DISET
= 3kΩ
PEN1 = low, USUS = high
USUS = low,
CEN
= low;
I
SYS
= 0mA, I
BAT
= 0mA, EN = low;
VL no load
USUS = low,
CEN
= high;
I
SYS
= 0mA, V
EN
= 0V, VL no load
Minimum DC-to-BAT Voltage
Headroom
Minimum DC-to-SYS Voltage
Headroom
DC-to-SYS Dropout Resistance
R
DS
V
DC
falling, 200mV hysteresis
V
DC
falling, 200mV hysteresis
V
DC
= 5V, I
SYS
= 400mA, USUS = low
0
0
MIN
4.1
0
5.2
3.95
6.8
90
5.3
4.00
6.9
95
TYP
MAX
6.6
14
5.4
4.05
7.0
100
mA
UNITS
DC POWER INPUT (V
DC
= 5.0V, EN = low)
DC Voltage Range
SYS Regulation Voltage
DC Undervoltage Threshold
DC Overvoltage Threshold
V
DC
V
SYS_REG
V
DCL
V
DCH
V
V
V
V
DC Current Limit
I
DCLIM
450
950
3
475
1000
500
1050
6
R
DISET
Resistance Range
kΩ
0.11
1.1
DC Quiescent Current
I
DCIQ
mA
0.7
15
15
0.325
30
30
0.600
mV
mV
Ω
4
_______________________________________________________________________________________
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
ELECTRICAL CHARACTERISTICS (continued)
(DC, USB, BVSET,
UOK, DOK,
LX_ unconnected; V
THM
= V
L
/2, V
PG_
= V
AGND
= 0V, V
BAT
= 4V,
CEN
= low, USUS = low, EN = high,
V
PEN1
= V
PEN2
= 3.3V, V
PWM
= 0V, C
OUT4
= 1µF, C
OUT5
= 1µF, C
SYS
= 10µF, PV1 = PV2 = PV3 = PV4 = PV5 = SYS, R
DISET
= 3kΩ,
R
CISET
= 3kΩ, C
VL
= 0.1µF, C
CT
= 0.15µF, C
BP
= 0.01µF, V
FB1
= 1.1V, V
FB2
= 1.1V, V
FB3
= 1.1V, T
A
= -40°C to +85°C, unless other-
wise noted.) (Note 2)
PARAMETER
DC-to-SYS Soft-Start Time
DC Thermal-Limit Temperature
DC Thermal-Limit Gain
USB POWER INPUT (V
USB
= 5.0V, EN = low)
USB Voltage Range
V
USB
Operating voltage
Withstand voltage
V
USB
= 6V, USUS = low,
CEN
= high,
system current is less than the input current
limit
V
USB
rising, 500mV hysteresis
V
USB
rising, 400mV hysteresis
V
USB
= 6V, V
SYS
= 5V, DC
unconnected,
CEN
= low,
T
A
= +25°C,
I
VL
= 0A (Note 3)
USUS = high
USB Quiescent Current
I
USBIQ
USUS = low,
CEN
= low;
I
SYS
= 0mA, I
BAT
= 0mA, VL no load
USUS = low,
CEN
= high;
I
SYS
= 0mA, VL no load
Minimum USB-to-BAT Voltage
Headroom
Minimum USB-to-SYS Voltage
Headroom
USB-to-SYS Dropout Resistance
USB-to-SYS Soft-Start Time
USB Thermal-Limit Temperature
USB Thermal-Limit Gain
SYSTEM (V
DC
= 5.0V, EN = low)
System Operating Voltage Range
System Undervoltage Threshold
V
SYS
V
UVLO_SYS
SYS falling, 100mV hysteresis
2.6
2.45
2.50
5.5
2.55
V
V
R
US
t
SS-U-S
Die temperature at which current limit is
reduced
Amount of input current reduction above
thermal-limit temperature
V
USB
falling, 200mV hysteresis
V
USB
falling, 200mV hysteresis
V
USB
= 5V, I
SYS
= 400mA, USUS = low
0
0
PEN2 = low,
USUS = low
PEN2 = high,
USUS = low
4.1
0
5.2
3.95
6.8
90
450
5.3
4.0
6.9
95
475
0.11
1.1
0.7
15
15
0.325
1.0
100
5
2.0
1.3
30
30
0.600
mV
mV
Ω
ms
°C
%/°C
mA
6.6
14
5.4
4.05
7.0
100
mA
500
V
SYMBOL
t
SS-D-S
CONDITIONS
Starting DC when no USB present
Starting DC with USB present
Die temperature at which current limit is
reduced
Amount of input current reduction above
thermal-limit temperature
MIN
TYP
1.0
35
+100
5
MAX
UNITS
ms
µs
°C
%/°C
MAX8671X
SYS Regulation Voltage
USB Undervoltage Threshold
USB Overvoltage Threshold
V
SYS_REG
V
USBL
V
USBH
V
V
V
USB Current Limit
I
USBLIM
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