Maxim MAX1736EUT41-T, MAX1736EUT42-T Schematic [ru]
General Description
The MAX1736 is a simple, low-cost, single-cell lithiumion (Li+) battery charger for small hand-held applications. When accompanied by a current-limited voltage
source (such as a wall cube), the MAX1736 provides
simple, accurate charging and termination control for
single-cell Li+ batteries. The MAX1736EUT42 is preset
to a 4.2V battery regulation voltage, while the
MAX1736EUT41 is preset to 4.1V.
The MAX1736 initiates charging in one of four ways:
battery insertion, charger power-up, battery voltage
threshold, and by external manipulation of the EN pin.
The device features an internal precharge current
source that safely charges near-dead cells, as well as
input-supply detection that shuts down the MAX1736
when the supply is removed to minimize battery current
drain.
The MAX1736 accepts input voltages up to 22V, making it compatible with a wide range of input supplies. It
has a single control input yet offers stand-alone and
microprocessor-controlled operation. The MAX1736 is
packaged in a small SOT23-6 package. An evaluation
kit (EV kit) is available to reduce design time.
________________________Applications
Single-Cell Li+ Portable Applications
Wireless Handsets
Personal Digital Assistants
Digital Cameras
Small Hand-Held Equipment
Self-Charging Battery Packs
Cradle Chargers
Features
♦ Small 6-Pin SOT23 Package
♦ Stand-Alone or µP-Controlled Operation
♦ 0.5% Voltage Set-Point Accuracy
♦ Lowest Power Dissipation
♦ Low 4.7V min Input Voltage
♦ Top-Off Charging to Achieve Full Battery Capacity
♦ No Inductor Required
♦ Safely Precharges Near-Dead Cells
♦ Automatic Power-Down when Input Power
Removed
Note: Requires special solder temperature profile
described in the Absolute Maximum Ratings Section.
MAX1736
SOT23, Single-Cell Li+ Battery
Charger for Current-Limited Supply
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration
CURRENT-LIMITED
VOLTAGE SOURCE
GATE
BATT
BATTERY
GND
IN
EN
CT
ON
OFF
MAX1736
PFET
Typical Operating Circuit
19-1662; Rev 1; 10/00
EVALUATION KIT
AVAILABLE
Ordering Information
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART
MAX1736EUT42-T -40°C to +85°C 6 SOT23-6 AAHO
MAX1736EUT41-T -40°C to +85°C 6 SOT23-6 AANC
TEMP.
RANGE
PINPACKAGE
SOT
MARK
TOP VIEW
IN
GATE
16BATT
MAX1736
2
34
SOT23
5 CT
ENGND
MAX1736
SOT23, Single-Cell Li+ Battery Charger
for Current-Limited Supply
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
IN, GATE to GND....................................................-0.3V to +26V
BATT, EN, CT to GND ..............................................-0.3V to +6V
GATE to IN................................................................-6V to +0.3V
GATE Continuous Current.................................-10mA to +10mA
Continuous Power Dissipation (T
A
= +70°C) (Note 1)
6-Pin SOT23 (derate 8.1mW/°C above +70°C).............0.65W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ..............................-65°C to +150°C
Maximum Junction Temperature ......................................+150°C
Lead Temperature (soldering, 10s) (Note 2) ...................+300°C
ELECTRICAL CHARACTERISTICS
(VIN= 10V, V
BATT
= 4.2V for MAX1736EUT42 or 4.1V for MAX1736EUT41, TA= 0°C to +85°C. Typical values are at TA= +25°C,
unless otherwise noted.) (Note 3)
Note 1: Thermal properties are specified with product mounted on PC board with one square-inch of copper area and still air.
Note 2: This device is constructed using a unique set of packaging techniques that impose a limit on the termal profile the device can be
exposed to during solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry standard specification, IPC/JEDEC J-STD-020A, paragraph 7.6, Table 3 for the IR/VPR and Convention reflow. Pre-heating is required.
Hand or wave soldering is not allowed.
Input Voltage (Note 4) External P-MOSFET off 4.7 22 V
Fast-Charge BATT Qualification
Threshold
Fast-Charge BATT Qualification
Threshold Hysteresis
BATT Regulation Voltage
BATT Removal Detection
Threshold
BATT Removal Detection
Threshold Hysteresis
BATT Input Current, Input Power
Removed
BATT Input Current, Charger
Disabled
BATT Input Current, When
Charging
Precharge Source Current V
IN Input Current 0.25 1 mA
IN Detection Interval (Note 5) C
GATE Source/Sink Current 75 100 125 µA
GATE Drive Source Current at
Battery Removal
Minimum BATT Bypass
Capacitance (Note 6)
EN Logic High Threshold 2V
EN Logic Low Threshold 0.7 V
CT Pulldown Current 1.6 2 2.4 µA
PARAMETER CONDITIONS MIN TYP MAX UNITS
BATT rising, transition from precharge to fast charge 2.4 2.5 2.65 V
MAX1736EUT42 4.179 4.20 4.221
MAX1736EUT41 4.079 4.10 4.121
BATT rising 4.875 5.0 5.1 V
V
≤ V
IN
EN = GND, V
BATT
CT
V
BATT
- 0.3V 0.1 1 µA
BATT
= 0 to 5V 2 6 µA
BATT
= 2V 3.5 6 8 mA
= 0.33µF 20 s
= 5.1V 15 30 60 mA
70 mV
V
125 mV
0.4 0.75 mA
1.5 µF/A
MAX1736
SOT23, Single-Cell Li+ Battery Charger
for Current-Limited Supply
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 10V, V
BATT
= 4.2V for MAX1736EUT42 or 4.1V for MAX1736EUT41, TA= 0°C to +85°C. Typical values are at TA= +25°C,
unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
(VIN= 10V, V
BATT
= 4.2V for MAX1736EUT42 or 4.1V for MAX1736EUT41, TA= -40°C to +85°C, unless otherwise noted.) (Note 3)
Note 3: All devices are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by
design.
Note 4: The input voltage range is specified with the external PFET off. When charging, the PFET turns on and the input voltage (the
output voltage of the constant-current power source) drops to very near the battery voltage. When the PFET is on, IN may be
as low as 2.5V.
Note 5: Every 20s (for CT = 0.33µF) the MAX1736 turns off the external P-channel MOSFET and samples IN to determine if input
power is present. If input power is removed, the charger shuts down.
Note 6: For design guidance, not tested.
CT Pullup Current -12 -10 -8
Minimum On-Time C
Minimum Off-Time C
EN Pullup Resistance 175 350 725 kΩ
PARAMETER CONDITIONS MIN TYP MAX UNITS
= 0.33µF 165 ms
CT
= 0.33µF 33 ms
CT
µA
Input Voltage (Note 4) External P-MOSFET off 4.7 22 V
Fast-Charge BATT Qualification
Threshold
BATT Regulation Voltage
BATT Removal Detection
Threshold
BATT Input Current, Input Power
Removed
BATT Input Current, Charger
Disabled
BATT Input Current, When
Charging
Precharge Source Current V
IN Input Current 1mA
GATE Source/Sink Current 60 140 µA
GATE Drive Source Current at
Battery Removal
EN Logic High Threshold 2 V
EN Logic Low Threshold 0.7 V
CT Pulldown Current 1.5 2.5 µA
CT Pullup Current -12 -8 µA
EN Pullup Resistance 170 725 kΩ
PARAMETER CONDITIONS MIN MAX UNITS
BATT rising, transition from precharge to fast charge 2.4 2.65 V
MAX1736EUT42 4.158 4.242 V
MAX1736EUT41 4.058 4.142
BATT rising 4.85 5.125 V
VIN ≤ V
EN = GND, V
BATT
V
BATT
- 0.3V 1 µA
BATT
= 0 to 5V 6 µA
BATT
0.75 mA
= 2V 3 8 mA
= 5.1V 10 90 mA
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