Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - battery management Charge management Li-Ion TQFN 28 (4x4) Surface-mount

19-4410; Rev 5; 9/11

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

MAX8903A–E/G/H/J/N/Y

2A 1-Cell Li+ DC-DC Chargers

for USB and Adapter Power

EVALUATION KIT AVAILABLE

General Description

The MAX8903A–MAX8903E/MAX8903G/MAX8903H/

MAX8903J/MAX8903N/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 components. 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 cur-

rent-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.

Applications

Features

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

Automatic Adapter/USB/Battery Switchover to

Support Load Transients

50mΩ System-to-Battery Switch

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

Pin Configuration appears at end of data sheet.

Selector Guide appears at end of data sheet.

CHARGE

AND

SYS LOAD

SWITCH

SYS

BAT

ADAPTER

OR USB

SYSTEM

LOAD

BATTERY

GND

USB

CHARGE

CURRENT

LOAD

CURRENT

PWM

STEP-DOWN

MAX8903_

Typical Operating Circuit

Smart Power Selector is a trademark of Maxim Integrated

Products, Inc.

PDAs, Palmtops, and

Wireless Handhelds

Personal Navigation

Devices

Smart Cell Phones

Portable Multimedia

Players

Mobile Internet Devices

Ultra Mobile PCs

Ordering Information

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

T = Tape and reel.

PART TEMP RANGE PIN-PACKAGE

MAX8903AETI+T

-40°C to +85°C

28 Thin QFN-EP*

MAX8903BETI+T

-40°C to +85°C

28 Thin QFN-EP*

MAX8903CETI+T

-40°C to +85°C

28 Thin QFN-EP*

MAX8903DETI+T

-40°C to +85°C

28 Thin QFN-EP*

MAX8903EETI+T

-40°C to +85°C

28 Thin QFN-EP*

MAX8903GETI+T

-40°C to +85°C

28 Thin QFN-EP*

MAX8903HETI+T

-40°C to +85°C

28 Thin QFN-EP*

MAX8903JETI+T

-40°C to +85°C

28 Thin QFN-EP*

MAX8903NETI+T

-40°C to +85°C

28 Thin QFN-EP*

MAX8903YETI+T

-40°C to +85°C

28 Thin QFN-EP*

Visit www.maximintegrated.com/products/patents for

product patent marking information.

Summary of content (30 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power General Description The MAX8903A–MAX8903E/MAX8903G/MAX8903H/ MAX8903J/MAX8903N/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 components.
PAGE 2
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power ABSOLUTE MAXIMUM RATINGS DC, LX to GND .......................................................-0.3V to +20V DCM to GND ..............................................-0.3V to (VDC + 0.3V) DC to SYS .................................................................-6V to +20V BST to GND ...........................................................-0.3V to +26V BST TO LX ................................................................-0.
PAGE 3
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power ELECTRICAL CHARACTERISTICS (continued) (VDC = VUSB = 5V, VBAT = 4V, circuit of Figure 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power ELECTRICAL CHARACTERISTICS (continued) (VDC = VUSB = 5V, VBAT = 4V, circuit of Figure 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX TA = +25°C 4.179 4.200 4.
PAGE 5
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power ELECTRICAL CHARACTERISTICS (continued) (VDC = VUSB = 5V, VBAT = 4V, circuit of Figure 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS THERMISTOR MONITOR THM Threshold, Hot When charging is suspended, 1% hysteresis 0.27 x VVL 0.28 x VVL 0.29 x VVL V THM Threshold, Cold When charging is suspended, 1% hysteresis 0.73 x VVL 0.74 x VVL 0.
PAGE 6
ELECTRICAL CHARACTERISTICS (continued) (VDC = VUSB = 5V, VBAT = 4V, circuit of Figure 2, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS VL Output Voltage MIN TYP MAX IVL = 0 to 1mA (MAX8903A/C/D/H/J/N/Y) 4.6 5.0 5.4 IVL = 0 to 10mA (MAX8903B/E/G) 4.6 5.0 5.4 UNITS V VDC = VUSB = 6V VL UVLO Threshold 3.
PAGE 7
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) MAX8903A/B/C/D/E/H/J/N/Y SYS EFFICIENCY vs. SYS OUTPUT CURRENT VBAT = 4V VBAT = 3V 0.4 VDC = 11V 50 VDC = 16V 40 30 VDC = 6V 20 RISET = 1.2kI VCEN = 0V 0.2 10 6 8 10 12 14 VDC = 12V 40 VDC = 9V 30 VDC = 6V 10 10 100 10000 1000 1 10 100 SYS OUTPUT CURRENT (mA) USB SUPPLY CURRENT vs. USB VOLTAGE USB SUPPLY CURRENT vs.
PAGE 8
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) NORMALIZED BATTERY REGULATION VOLTAGE vs. AMBIENT TEMPERATURE 1.005 1.000 0.995 0.990 0.985 -15 -40 10 35 60 100.3 4.0 100.1 100.0 99.9 2.0 99.7 1.0 0.5 22ppm/°C 10 35 0 85 60 RSYS = 1MΩ 0 99.5 -15 VUSB RISING 1 2 3 4 5 6 7 USB VOLTAGE (V) MAX8903A/C/D/H/N/Y SYS VOLTAGE vs. DC VOLTAGE SYS VOLTAGE vs.
PAGE 9
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) MAX8903A/B/C/G/H CHARGE PROFILE—1400mAh BATTERY USB INPUT—500mA CHARGE MAX8903A toc18 5.0 MAX8903A toc19 0.50 4.5 0.45 4.0 0.40 3.5 20mV/div AC-COUPLED VOUT 0.35 VBAT 3.0 0.30 2.5 0.25 IBAT 2.0 0.20 1.5 0.15 1.0 MAX8903A/MAX8903B/MAX8903C IUSB SET TO 500mA IBAT SET TO 2A 0.
PAGE 10
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) DC CONNECT WITH NO USB (RSYS = 25Ω) DC DISCONNECT WITH NO USB (RSYS = 25Ω) MAX8903A toc22 3.84V 3.6V VSYS 3.6V VBAT IBAT 2V/div 3.44V 5V/div CDC CHARGING IDC MAX8903A toc23 CSYS CHARGING 850mA 3.68V 3.6V VSYS 3.
PAGE 11
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) USB DISCONNECT WITH NO DC (RSYS = 25Ω) USB SUSPEND MAX8903A toc26 VSYS 3.6V VUSB 2V/div 5V/div 5V USB RESUME MAX8903A toc27 VUSUS IUSB 0V 475mA 3V MAX8903A toc28 5V/div 0A VUSUS 500mA/div IUSB 0V 3V 500mA/div VSYS IBAT -330mA 144mA 100µs/div 2V/div 3.7V 500mA/div IBAT -475mA 0A 3.
PAGE 12
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Pin Description (continued) PIN NAME 13 ISET Charge Current Set Input. A resistor (RISET) from ISET to GND programs the fast-charge current up to 2A. The prequal charge current is 10% of the fast-charge current. 14 CEN Charger Enable Input. Connect CEN to GND to enable battery charging when a valid source is connected at DC or USB. Connect to VL, or drive high to disable battery charging. 15 USUS USB Suspend Input.
PAGE 13
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power PG AC ADAPTER DC LX BST CS MAX8903_ DC POWER MANAGEMENT SYS PWR OK Li+ BATTERY CHARGER AND SYS LOAD SWITCH PWM STEP-DOWN REGULATOR DOK CHARGER CURRENTVOLTAGE CONTROL SET INPUT LIMIT TO SYSTEM LOAD ISET BATTERY CONNECTOR BAT BAT+ + BAT- USB POWER MANAGEMENT USB USB PWR OK T THERMISTOR MONITOR (SEE FIGURE 7) CURRENTLIMITED VOLTAGE REGULATOR UOK IC THERMAL REGULATION NTC VL CHARGE TERMINATION AND MONITOR S
PAGE 14
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power RPU 4 x 100kΩ TO VL 1 2 PG PG MAX8903_ CDC 4.7µF UOK 3 DC ADAPTER DOK 4 DC 6 CBST 0.1µF FLT CHG BST 27 LX 18 FAULT OUTPUT 19 USB PWR OK 8 DC PWR OK 22 CHARGE INDICATOR 13 RISET 11 RIDC ISET 28 LX IDC L1 1µH 25 CS (SEE TABLE 5 FOR INDUCTOR SELECTION) 26 CS SYS 24 SYS 23 BAT 21 BAT 20 TO SYSTEM LOAD CSYS (SEE TABLE 6 FOR CSYS SELECTION) USB 17 VBUS USB CUSB 4.
PAGE 15
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power RPU 4 x 100kΩ TO VL 1 2 PG PG MAX8903_ CDC 4.7µF DOK 4 DC D- 6 D+ CBST 0.1µF ID GND CHG BST 27 LX 18 FAULT OUTPUT 19 USB PWR-OK 8 DC PWR-OK 22 CHARGE INDICATOR 13 RISET 11 RIDC ISET 28 LX L1 1µH 499kΩ IDC 25 CS 26 CS (SEE TABLE 5 FOR INDUCTOR VALUE SELECTION) 17 DC MODE UOK 3 DC VBUS FLT USB ADAPTER 5 OFF CHARGE ON 14 500mA 100mA 7 USB SUSPEND 15 10 CCT 0.
PAGE 16
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Table 1. External Components List for Figures 2 and 3 COMPONENT (FIGURES 2 AND 3) CDC, CUSB FUNCTION Input filter capacitor 4.7µF ceramic capacitor CVL VL filter capacitor 1.
PAGE 17
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power circuit of Figure 3 shows a simple MOSFET and resistor on DCM to prevent any current from flowing from DCM through the internal diode to DC. This circuit of Figure 3 allows a microprocessor to drive the gate of the MOSFET to any state at any time. An alternative to the simple MOSFET and resistor on DCM as shown in Figure 3 is to place a 1MΩ resistor in series with the DCM input to the microprocessor.
PAGE 18
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Table 2.
PAGE 19
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power When the charger is turned on, the charge current ramps from 0A to the ISET current value in typically 1.0ms. Charge current also soft-starts when transitioning to fastcharge from prequal, when the input power source is switched between USB and DC, and when changing the USB charge current from 100mA to 500mA with the IUSB logic input. There is no di/dt limiting, however, if RISET is changed suddenly using a switch.
PAGE 20
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power NOT READY UOK AND DOK = HIGH IMPEDANCE CHG = HIGH IMPEDANCE FLT = HIGH IMPEDANCE ICHG = 0mA CEN = HI OR REMOVE AND RECONNECT THE INPUT SOURCE(S) ANY STATE UOK AND/OR DOK = LOW CEN = 0 RESET TIMER PREQUALIFICATION UOK AND/OR DOK = LOW CHG = LOW FLT = HIGH IMPEDANCE 0 < VBAT < VBATPQ ICHG ≤ ICHGMAX/10 VBAT < VBATPQ - 180mV RESET TIMER = 0 ICHG > ITERM RESET TIMER ANY CHARGING STATE THM OK TIMER RESUME THM NOT OK TIMER SUSPEND TEM
PAGE 21
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power CEN VL THERMISTOR CIRCUITRY VL MAX8903_ 0.87 VL RTB ALTERNATE THERMISTOR CONNECTION 0.74 VL MAX8903B/MAX8903E/ MAX8903G ONLY THERMISTOR DETECTOR COLD THM RTS 0.28 VL RTP HOT RT ENABLE THM 0.03 VL RT THM OUT OF RANGE DISABLE CHARGER ALL COMPARATORS 60mV HYSTERESIS GND Figure 7. Thermistor Monitor Circuitry Table 3.
PAGE 22
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power where: RT = The resistance in Ω of the thermistor at temperature T in Celsius R25 = The resistance in Ω of the thermistor at +25°C β = The material constant of the thermistor, which typically ranges from 3000K to 5000K T = The temperature of the thermistor in °C Table 3 shows the MAX8903_ THM temperature limits for different thermistor material constants. and let the system continue to operate with external power.
PAGE 23
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power on-time constraints (tONMIN), the regulator becomes a fixed minimum on-time valley current regulator. Versions of the MAX8903 with fSW = 4MHz offer the smallest LOUT while delivering good efficiency with low input voltages (5V or 9V). For applications that use high input voltages (12V), the MAX8903G with fSW = 1MHz is the best choice because of its higher efficiency.
PAGE 24
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Table 5. Recommended Inductor Examples DC INPUT VOLTAGE RANGE 5V ±10% 5V ±10% 5V ±10% 5V ±10% 9V ±10% 9V ±10% 24 DC STEP-DOWN OUTPUT CURRENT LIMIT (ISDMAX) PART NUMBER, SWITCHING FREQUENCY* RECOMMENDED INDUCTOR MAX8903H/J/N/Y, 4MHz 1.0µH, IFSC1008ABER1R0M01, Vishay 2.5mm x 2mm x 1.2mm, 43mΩ (max), 2.6A or 1.0µH, LQH32PN1R0-NN0, Murata, 3.2mm x 2.5mm x 1.55mm, 54mΩ (max), 2.3A 1A MAX8903H/J/N/Y, 4MHz 1.
PAGE 25
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Table 5. Recommended Inductor Examples (continued) DC INPUT VOLTAGE RANGE 9V ±10% 9V ±10% 9V ±10% 9V ±10% 12V ±10% 12V ±10% DC STEP-DOWN OUTPUT CURRENT LIMIT (ISDMAX) PART NUMBER, SWITCHING FREQUENCY* 2A MAX8903A/B/C/D/E, 4MHz 2.2µH inductor, DFE322512C-2R2N, TOKO 3.2mm x 2.5mm x 1.2mm, 91mΩ (max), 2.4A or 2.2µH Inductor, IFSC1515AHER2R2M01, Vishay 3.8mm x 3.8mm x 1.8mm, 45mΩ (max), 3A 1A MAX8903A/B/C/D/E, 4MHz 2.
PAGE 26
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Selector Guide The MAX8903_ is available in several options designated by the first letter following the root part number. The basic architecture and functionality of the MAX8903A–MAX8903E/MAX8903G/MAX8903Y are the same. Their differences lie in certain electrical and operational parameters. Table 6 outlines these differences. Table 6.
PAGE 27
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Pin Configuration Chip Information USB THM USUS 20 UOK 21 FLT BAT TOP VIEW BAT PROCESS: BiCMOS 19 18 17 16 15 CHG 22 14 CEN SYS 23 13 ISET 12 GND 11 IDC CS 26 10 CT LX 27 9 VL 8 DOK SYS 24 MAX8903_ CS 25 5 6 7 IUSB DC 4 BST 3 DCM 2 DC 1 PG + PG LX 28 EP TQFN Maxim Integrated 27
PAGE 28
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 28 PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 29
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Package Information (continued) For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 30
MAX8903A–E/G/H/J/N/Y 2A 1-Cell Li+ DC-DC Chargers for USB and Adapter Power Revision History REVISION NUMBER REVISION DATE 0 12/08 Initial release 1 8/09 Added MAX8903C/MAX8903D to data sheet 2 11/09 Made various corrections 3 10/10 Added MAX8903B, MAX8903E, MAX8903G, and MAX8903Y 1–29 4 5/11 Added MAX8903H and MAX8903J and updated components 1–29 5 9/11 Added the MAX8903N, and removed future product designation for MAX8903J 1–29 DESCRIPTION PAGES CHANGED — 1–20 1–7, 9, 11–21 Maxim