MAX8903DETI+ Maxim Integrated Products, MAX8903DETI+ Datasheet

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MAX8903DETI+

Manufacturer Part Number
MAX8903DETI+
Description
IC DC/DC CHARGER LI+ 2A 28-TQFN
Manufacturer
Maxim Integrated Products
Series
Smart Power Selector™r
Datasheet
1.MAX8903AETI.pdf (28 pages)

Specifications of MAX8903DETI+

Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion)
Voltage - Supply
4.1 V ~ 16 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8903A–MAX8903E/MAX8903G/MAX8903Y are
integrated 1-cell Li+ chargers and Smart Power
Selectors™ with dual (AC adapter and USB) power
inputs. The switch mode charger uses a high switching
frequency to eliminate heat and allow tiny external com-
ponents. It can operate with either separate inputs for
USB and AC adapter power, or from a single input that
accepts both. All power switches for charging and
switching the load between battery and external power
are included on-chip. No external MOSFETs, blocking
diodes, or current-sense resistors are required.
The MAX8903_ features optimized smart power control
to make the best use of limited USB or adapter power.
Battery charge current and SYS output current limit are
independently set. Power not used by the system
charges the battery. Charge current and SYS output cur-
rent limit can be set up to 2A while USB input current can
be set to 100mA or 500mA. Automatic input selection
switches the system from battery to external power. The
DC input operates from 4.15V to 16V with up to 20V pro-
tection, while the USB input has a range of 4.1V to 6.3V
with up to 8V protection.
The MAX8903_ internally blocks current from the bat-
tery and system back to the DC and USB inputs when
no input supply is present. Other features include pre-
qual charging and timer, fast charge timer, overvoltage
protection, charge status and fault outputs, power-OK
monitors, and a battery thermistor monitor. In addition,
on-chip thermal limiting reduces battery charge rate
and AC adapter current to prevent charger overheat-
ing. The MAX8903_ is available in a 4mm x 4mm, 28-pin
thin QFN package.
The various versions of the MAX8903_ allow for design
flexibility to choose key parameters such as system
regulation voltage, battery prequalification threshold,
and battery regulation voltage. The MAX8903B/
MAX8903E/MAX8903G also includes power-enable on
battery detection. See the Selector Guide section for
complete details.
19-4410; Rev 3; 10/10
PDAs, Palmtops, and
Wireless Handhelds
Personal Navigation
Devices
Smart Cell Phones
Selector Guide appears at end of data sheet.
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
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.
________________________________________________________________ Maxim Integrated Products
General Description
2A 1-Cell Li+ DC-DC Chargers for USB
Portable Multimedia
Players
Mobile Internet Devices
Ultra Mobile PCs
Applications
o Efficient DC-DC Converter Eliminates Heat
o 4MHz Switching for Tiny External Components
o Instant On—Works with No/Low Battery
o Dual Current-Limiting Inputs—AC Adapter or USB
o Thermistor Monitor
o Integrated Current-Sense Resistor
o No External MOSFETs or Diodes
o 4.1V to 16V Input Operating Voltage Range
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
** Future product—contact factory for availability.
T = Tape and reel.
Pin Configuration appears at end of data sheet.
ADAPTER
MAX8903AETI+T
MAX8903BETI+T
MAX8903CETI+T
MAX8903DETI+T
MAX8903EETI+T
MAX8903GETI+T
MAX8903YETI+T**
OR USB
USB
AC
Automatic Adapter/USB/Battery Switchover to
50mΩ System-to-Battery Switch
Supports USB Spec
Support Load Transients
PART
USB
DC
and Adapter Power
STEP-DOWN
LX
PWM
Typical Operating Circuit
CS
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
MAX8903A–
MAX8903G
MAX8903Y
MAX8903E
CHARGE
CURRENT
PIN-PACKAGE
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
LOAD
CURRENT
CHARGE
SYS LOAD
SWITCH
AND
Features
GND
SYS
BAT
BATTERY
SYSTEM
LOAD
1

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MAX8903DETI+ Summary of contents

Page 1

... Supports USB Spec o Thermistor Monitor o Integrated Current-Sense Resistor o No External MOSFETs or Diodes o 4.1V to 16V Input Operating Voltage Range PART MAX8903AETI+T MAX8903BETI+T MAX8903CETI+T MAX8903DETI+T MAX8903EETI+T MAX8903GETI+T MAX8903YETI+T** + Denotes a lead(Pb)-free/RoHS-compliant package Exposed pad. ** Future product—contact factory for availability Tape and reel. AC ...

Page 2

Li+ DC-DC Chargers for USB and Adapter Power ABSOLUTE MAXIMUM RATINGS DC GND .......................................................-0.3V to +20V DCM to GND ..............................................-0. SYS .................................................................-6V to +20V BST to GND ...........................................................-0.3V to +26V BST TO ...

Page 3

Li+ DC-DC Chargers for USB ELECTRICAL CHARACTERISTICS (continued 5V 4V, circuit of Figure USB BAT (Note 1) PARAMETER No valid USB input DC Soft-Start Time Valid USB input before ...

Page 4

Li+ DC-DC Chargers for USB and Adapter Power ELECTRICAL CHARACTERISTICS (continued 5V 4V, circuit of Figure USB BAT (Note 1) PARAMETER BATTERY CHARGER BAT Regulation Voltage I BAT (V ...

Page 5

Li+ DC-DC Chargers for USB ELECTRICAL CHARACTERISTICS (continued 5V 4V, circuit of Figure USB BAT (Note 1) PARAMETER THERMISTOR MONITOR THM Threshold, Hot When charging is suspended, 1% hysteresis ...

Page 6

Li+ DC-DC Chargers for USB and Adapter Power ELECTRICAL CHARACTERISTICS (continued 5V 4V, circuit of Figure USB BAT (Note 1) PARAMETER VL Output Voltage UVLO Threshold ...

Page 7

Li+ DC-DC Chargers for USB (T = +25°C, unless otherwise noted.) A MAX8903G SWITCHING FREQUENCY vs 1.6 1.4 1.2 1.0 0 BAT 0.6 BAT 0 1.2kI 0.2 ISET ...

Page 8

Li+ DC-DC Chargers for USB and Adapter Power (T = +25°C, unless otherwise noted.) A NORMALIZED CHARGE CURRENT vs. AMBIENT TEMPERATURE 1.015 USB BAT 1.010 1.005 1.000 0.995 0.990 0.985 -40 -15 ...

Page 9

Li+ DC-DC Chargers for USB (T = +25°C, unless otherwise noted.) A CHARGE PROFILE—1400mAh BATTERY USB INPUT—500mA CHARGE MAX8903A toc18 5.0 4.5 4.0 3.5 V BAT 3.0 2.5 I BAT 2.0 1.5 1.0 MAX8903A/MAX8903B/MAX8903C I SET TO 500mA ...

Page 10

Li+ DC-DC Chargers for USB and Adapter Power (T = +25°C, unless otherwise noted CONNECT WITH NO USB (R = 25Ω) SYS 3.84V 3.6V V SYS 3.44V 3.6V V BAT SYS CHARGING CHARGING ...

Page 11

Li+ DC-DC Chargers for USB (T = +25°C, unless otherwise noted.) A USB DISCONNECT WITH 25Ω) SYS MAX8903A toc26 3.6V 2V/div V SYS 5V/div V USB 5V 475mA 500mA/div I USB I BAT -330mA ...

Page 12

Li+ DC-DC Chargers for USB and Adapter Power PIN NAME Charge Current Set Input. A resistor (R 13 ISET The prequal charge current is 10% of the fast-charge current. Charger Enable Input. Connect CEN to GND to enable ...

Page 13

Li+ DC-DC Chargers for USB PG DC POWER MANAGEMENT DC AC ADAPTER PWR OK STEP-DOWN REGULATOR DOK USB POWER USB MANAGEMENT USB PWR CURRENT- OK LIMITED VOLTAGE UOK REGULATOR INPUT LIMIT DCM DC MODE IUSB 500mA INPUT AND ...

Page 14

Li+ DC-DC Chargers for USB and Adapter Power C DC 4.7μF ADAPTER C BST 0.1μF L1 1μH USB VBUS C USB 4.7μF GND TO DC OFF CHARGE ON 500mA 100mA USB SUSPEND C CT 0.15μF Figure 2. Typical ...

Page 15

Li+ DC-DC Chargers for USB C DC 4.7μF VBUS BST 0.1μF ID GND L1 1μH 499kΩ USB DC MODE ADAPTER OFF CHARGE ON 500mA 100mA USB SUSPEND C 0.15μF Figure 3. Typical Application Circuit Using ...

Page 16

Li+ DC-DC Chargers for USB and Adapter Power Table 1. External Components List for Figures 2 and 3 COMPONENT FUNCTION (FIGURES 2 AND Input filter capacitor DC USB C VL filter capacitor VL C ...

Page 17

Li+ DC-DC Chargers for USB cannot be driven to a voltage higher than DC. The circuit of Figure 3 shows a simple MOSFET and resistor on DCM to prevent any current from flowing from DCM through the internal ...

Page 18

Li+ DC-DC Chargers for USB and Adapter Power Table 2. Input Limiter Control Logic DOK POWER SOURCE AC Adapter at DC Input L L USB Power at DC Input USB Power at USB Input, DC ...

Page 19

Li+ DC-DC Chargers for USB again as long as the SYS load current is less than the set current limit. When the charger is turned on, the charge current ramps from 0A to the ISET current value in ...

Page 20

Li+ DC-DC Chargers for USB and Adapter Power V < 180mV BAT BATPQ RESET TIMER ANY CHARGING STATE THM OK THM NOT OK TIMER RESUME TIMER SUSPEND TEMPERATURE SUSPEND I = 0mA CHG UOK OR DOK ...

Page 21

Li+ DC-DC Chargers for USB CEN THERMISTOR CIRCUITRY R TB ALTERNATE THERMISTOR CONNECTION Figure 7. Thermistor Monitor Circuitry Table 3. Fault Temperatures for Different Thermistors Thermistor β (K) 3000 3250 ...

Page 22

Li+ DC-DC Chargers for USB and Adapter Power where: = The resistance in Ω of the thermistor at tempera ture T in Celsius = The resistance in Ω of the thermistor at +25° β ...

Page 23

Li+ DC-DC Chargers for USB the current-mode regulator to provide a low-jitter, stable duty factor operation, the inductor ripple current should be greater than 200mA in the minimum ripple current condition. The maximum allowed output inductance L is ...

Page 24

Li+ DC-DC Chargers for USB and Adapter Power Example 4.5V 5.5V, V DC(MIN) DC(MAX 4.2V 3kΩ 0.2, I SYS(MAX) IDC imum step-down output current) From (1 ...

Page 25

Li+ DC-DC Chargers for USB The MAX8903_ is available in several options designat the first letter following the root part number. The basic architecture and functionality of the MAX8903A–MAX8903E/MAX8903G/MAX8903Y are the Table 7. Selector Guide PARAMETER ...

Page 26

Li+ DC-DC Chargers for USB and Adapter Power Pin Configuration TOP VIEW CHG 22 SYS 23 24 SYS MAX8903A– 25 MAX8903E CS MAX8903G 26 CS MAX8903Y ...

Page 27

Li+ DC-DC Chargers for USB For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different ...

Page 28

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 28 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products ...

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