EVALUATION KIT AVAILABLE
MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
General Description
The MAX8900_ is a high-frequency, switch-mode char-
ger for a 1-cell lithium ion (Li+) or lithium polymer
(Li-Poly) battery. It delivers up to 1.2A of current to the
battery from 3.4V to 6.3V (MAX8900A/MAX8900C) or
3.4V to 8.7V (MAX8900B). The 3.25MHz switch-mode
charger is ideally suited to small portable devices such
as headsets and ultra-portable media players because it
minimizes component size and heat.
Several features make the MAX8900_ perfect for high-
reliability systems. The MAX8900_ is protected against
input voltages as high as +22V and as low as -22V.
Battery protection features include low voltage prequali-
fication, charge fault timer, die temperature monitoring,
and battery temperature monitoring. The battery temper-
ature monitoring adjusts the charge current and termina-
tion voltage as described in the JEITA* specification for
safe use of secondary lithium-ion batteries.
Charge parameters are easily adjustable with external
components. An external resistance adjusts the charge
current from 50mA to 1200mA. Another external resis-
tance adjusts the prequalification and done current
thresholds from 10mA to 200mA. The done current thresh-
old is very accurate achieving
Q1mA
at the 10mA level.
The charge timer is adjustable with an external capacitor.
The MAX8900_ is available in a 0.4mm pitch, 2.44mm x
2.67mm x 0.64mm WLP package.
Features
S
3.25MHz Switching Li+/Li-Poly Battery Charger
S
JEITA Battery Temperature Monitor Adjusts
Charge Current and Termination Voltage
S
4.2V ±0.5% Battery Regulation Voltage (Alternate
4.1V Target Available on Request)
S
Adjustable Done Current Threshold
Adjustable from 10mA to 200mA
±1mA Accuracy at 10mA
S
High-Efficiency and Low Heat
S
Uses a 2.0mm x 1.6mm Inductor
S
Positive and Negative Input Voltage Protection
(±22V)
S
Up to +20V Operating Range (Alternate OVLO
Ranges Available on Request)
S
Supports No-Battery Operation
S
Fault Timer
S
Charge Status Outputs
S
2.44mm x 2.67mm x 0.64mm Package
Simplified Applications Circuit
1FH
Applications
USB Charging
Headsets and Media
Players
Smartphones
Digital Cameras
GPS, PND
eBook
V
IN
(-22V TO +22V) 0.47FF
25V
0603
BST
LX
IN
CS
BAT
PGND
2.2FF
6.3V
0603
SYSTEM
LOAD
MAX8900_
STAT1
STAT2
STAT3
CEN
PVL
INBP
CT
SETI
DNI
AVL
GND
THM
T
Ordering Information (continued)
PART
TEMP PIN-
RANGE PACKAGE
OFF
Li+/
Li-POLY
OPTIONS
V
OVLO
= 6.5V
T1 = 0NC
2-pin status indicators
V
PQUTH
= 2.8V
V
OVLO
= 9.0V
T1 = -15NC
3-pin status indicators
V
PQUTH
= 2.8V
1.0FF
6.3V
0402
ON
-40NC to
MAX8900AEWV+T
30 WLP
+85NC
0.47FF
25V
0603
MAX8900BEWV+T
-40NC to
30 WLP
+85NC
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information continued at end of data sheet.
*JEITA
(Japan Electronics and Information Technology
Industries Association) standard, “A Guide to the Safe Use
of Secondary Lithium Ion Batteries in Notebook-type Personal
Computers” April 20, 2007.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5063; Rev 4; 11/14
MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
TABLE OF CONTENTS
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Control Scheme. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Soft-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Fast-Charge Current (SETI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Prequalification Current and Done Threshold (DNI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Charge Enable Input (CEN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Charger States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Charger Disabled State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Dead-Battery State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Dead Battery + Prequalification State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Prequalification State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fast-Charge Constant Current State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fast-Charge Constant Voltage State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Top-Off State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Done State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Timer Fault State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Battery Hot/Cold State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
V
IN
Too High State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Charge Timer (CT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Thermal Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Thermistor Monitor (THM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Thermal Foldback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Thermal Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
PVL and AVL Regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Charge Status Outputs (3 Pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Charge Status Outputs (2 Pin + > T4). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Inductor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
BAT Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
INBP Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Other Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Applications Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Dynamic Charge Current Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
No-Battery Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2
Maxim Integrated
MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
TABLE OF CONTENTS (continued)
Charge-Source Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Charge-Source Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Inductive Kick. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Overvoltage and Reverse Input Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Chip Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Package Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
LIST OF FIGURES
Figure 1. Applications Circuit: Single SETI Resistor, Status Indicators Connected to LEDs . . . . . . . . . . . . . . . . . . . . 15
Figure 2. Applications Circuit: Multiple Charge Rates Managed by µP to Be USB Compliant, Status Indicators
Connected to a µP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 3. Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 4. Fast-Charge Current vs. R
SETI
(www.maximintegrated.com/tools/other/software/MAX8900-RSETI.XLS) 18
Figure 5. Prequalification Current and Done Threshold vs. R
DNI
(www.maximintegrated.com/tools/other/software/
MAX8900-DNI.XLS).
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 6. Li+/Li-Poly Charge Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 7. Charger State Diagram (3-Pin Status) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 8. Charger State Diagram (2-Pin Status). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 9. Charge Times vs. C
CT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
Figure 10. JEITA Battery Safety Regions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 11. Thermistor Monitor Detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 12. Charge Current vs. Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 13. Calculated Fast-Charge Current vs. Dropout Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 14. Power PCB Layout Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 15. Recommended Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 16. Bump Cross Section and Copper Pillar Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
LIST OF TABLES
Table 1. 2.44mm x 2.67mm x 0.64mm, 0.4mm Pitch WLP Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 2. Trip Temperatures for Different Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 3. 3-Pin Status Output Truth Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 4. 2-Pin Status Output Truth Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 5. Recommended Inductor Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 6. Recommended Inductor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Maxim Integrated
3
MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
ABSOLUTE MAXIMUM RATINGS
IN to PGND.............................................................-22V to +22V
INBP to PGND .......................................... (V
BAT
- 0.3V) to +22V
IN to INBP..............................................................-30V to +1.2V
STAT1, STAT2 to GND ..........................................-0.3V to +30V
BST to PGND.........................................................-0.3V to +36V
BST to LX..............................................................-0.3V to +6.0V
BST to PVL ............................................................-0.3V to +30V
PVL, BAT, CS to PGND ........................................-0.3V to +6.0V
AVL, STAT3,
CEN,
THM to GND ..........................-0.3V to +6.0V
PVL to AVL ...........................................................-0.3V to +0.3V
CT to GND .................................................-0.3V to (AVL + 0.3V)
SETI, DNI to GND .................................... -0.3V to (V
BAT
+ 0.3V)
PGND to GND ......................................................-0.3V to +0.3V
IN Continuous Current................................................... 2.4A
RMS
LX Continuous Current (Note 1) .................................... 1.6A
RMS
CS Continuous Current ................................................ 1.3ARMS
BAT Continuous Current ............................................... 1.3A
RMS
Continuous Power Dissipation (T
A
= +70NC)
30-Bump WLP (derate 20.4mW/NC above +70NC)....1616mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature ...................................... -40NC to +150NC
Storage Temperature Range............................ -65NC to +150NC
Soldering Temperture (reflow) ........................................+260NC
Note 1:
LX has an internal clamp diode to PGND and INBP. Applications that forward bias these diodes should take care not to
exceed the power dissipation limits of the device.
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
(V
IN
= 6V, V
BAT
= 4V, R
SETI
= 2.87kI, R
DNI
= 3.57kI, V
THM
= V
AVL/2
, circuit of Figure 1, T
A
= -40NC to +85NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
GENERAL
Withstand voltage
IN Input Voltage Range (Note 3)
V
IN
MAX8900B
Operating voltage
MAX8900A/
MAX8900C
-20
3.4
3.4
3.1
0
8.80
6.35
3.2
15
9.00
6.50
1
20
0.04
0.10
0.15
LX = GND or IN
V
BST
- V
LX
= 6V
R
SNS
R
IN2BAT
f
SW
V
BAT
= 2.6V
Calculation estimates a 40mI inductor
resistance (R
L
), R
IN2BAT
= R
IN2INBP
+ R
HS
+ R
L
+ R
SNS
V
BAT
= 2.6V
T
A
= +25NC
T
A
= +85NC
T
A
= +25NC
T
A
= +85NC
0.01
0.1
0.01
0.1
0.045
0.3
3.25
10
10
0.2
I
I
FA
FA
I
I
MHz
Maxim Integrated
SYMBOL
CONDITIONS
MIN
TYP
MAX
+20
8.7
6.3
3.3
30
9.20
6.65
2
UNITS
V
V
V
mV
IN Undervoltage Threshold
IN to BAT Shutdown Threshold
IN Overvoltage Threshold
(Note 3)
V
UVLO
V
IN2BAT
V
IN
falling, 400mV hysteresis (Note 4)
When charging stops, V
IN
falling, 200mV
hysteresis
0.40V hysteresis (MAX8900B)
V
IN
rising
0.26V hysteresis (MAX8900A/
MAX8900C)
V
OVLO
V
Charger enabled, no switching
IN Supply Current
LX High-Side Resistance
LX Low-Side Resistance
LX Leakage Current
BST Leakage Current
Current-Sense Resistor
IN to BAT Dropout Resistance
Switching Frequency
4
I
IN
R
HS
R
LS
Charger enabled, f = 3.25MHz, V
IN
= 6V
Charger disabled,
CEN
= high
mA
MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 6V, V
BAT
= 4V, R
SETI
= 2.87kI, R
DNI
= 3.57kI, V
THM
= V
AVL/2
, circuit of Figure 1, T
A
= -40NC to +85NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
PARAMETER
Minimum On-Time
Maximum On-Time
Minimum Off-Time
SYMBOL
t
ON-MIN
t
ON-MAX
t
OFF
T
A
= +25NC, V
THM
between
T1 and T3
I
BAT
= 0mA,
MAX8900A/
MAX8900B/
MAX8900C
(Figure 10)
T
A
= -40NC to +85NC, V
THM
between T1 and T3
T
A
= +25NC, V
THM
between
T3 and T4 (Note 5)
T
A
= -40NC to +85NC, V
THM
between T3 and T4 (Note 5)
Charger Restart Threshold
(Note 6)
BAT Prequalification Lower
Threshold (Figure 6)
BAT Prequalification Upper
Threshold (Figure 6) (Note 3)
V
RSTRT
V
PQLTH
V
PQUTH
V
THM
between T1 and T3
V
THM
between T3 and T4
V
BAT
rising,180mV hysteresis
V
BAT
rising, 180mV MAX8900A/MAX8900B
typical hysteresis
MAX8900C
V
THM
between T2
and T4 (Figure 10)
Fast-Charge Current
I
FC
R
SETI
= 2.87kI
R
SETI
= 6.81kI
R
SETI
= 34.0kI
2.7
2.9
1166
490
99
4.179
4.158
4.055
4.034
-70
CONDITIONS
MIN
TYP
90
9
75
4.200
4.200
4.075
4.075
-100
-75
2.1
2.8
3.0
1190
500
101
50
50
1200
2.87
68.1
93
47
9.5
99
50
10.5
50
95
49
10
105
54
11.5
50
115
59
13
%
mA
105
53
11.5
%
mA
2.9
3.1
1214
510
103
%
mA
kI
mA
4.221
4.242
V
4.095
4.100
-125
mV
V
V
MAX
UNITS
ns
Fs
ns
BAT Regulation Voltage (Note 3)
V
BATREG
V
THM
between T1 and T2 (Figure 10); the
fast-charge current is reduced to 50% the
value programmed by R
SETI
(Figure 5)
Minimum
Maximum
Minimum
Maximum
Fast-Charge Current Set Range
Fast-Charge Setting Resistor
Range
R
SETI
(Figure 5)
Done Current
I
DN
R
DNI
= 3.83kI (Note 5)
V
THM
between T2
R
DNI
= 7.68kI (Note 5)
and T4 (Figure 10)
R
DNI
= 38.3kI
V
THM
between T1 and T2 (Figure 10); the
done current threshold is reduced to 50%
the value programmed by R
DNI
V
THM
between T2 R
DNI
= 3.83kI (Note 5)
and T4 (Figure 10), R
DNI
= 7.68kI (Note 5)
V
BAT
= 2.6V
R
DNI
= 38.3kI (Note 5)
V
THM
between T1 and T2 (Figure 10); the
prequalification current is reduced to 50%
the value programmed by R
DNI
Prequalification Current
I
PQ
Maxim Integrated
5
stm32/stm8
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
