Maxim Integrated MAX17005A, MAX17006A, MAX17015A Datasheet

General Description

The MAX17005A/MAX17006A/MAX17015A are high-fre­quency multichemistry battery chargers. These circuits
feature a new high-frequency current-mode architecture
that significantly reduces component size and cost*.
The charger uses a high-side MOSFET with n-channel
synchronous rectifier. Widely adjustable charge current,
charge voltage, and input current limit simplify the con­struction of highly accurate and efficient chargers.

The charge voltage and charge current are set with
analog control inputs. The charge current setting can
also be adjusted with a PWM input. High-accuracy cur­rent-sense amplifiers provide fast cycle-by-cycle cur­rent-mode control to protect against short circuits to the
battery and respond quickly to system load transients.
In addition, the charger provides a high-accuracy ana­log output that is proportional to the adapter current. In
the MAX17015A, this current monitor remains active
when the adapter is absent to monitor battery dis­charge current.

The MAX17005A charges three or four Li+ series cells,
and the MAX17006A charges two or three Li+ series
cells. The MAX17015A adjusts the charge voltage set­ting and the number of cells through a feedback resis­tor-divider from the output. All variants of the charger
can provide at least 4A of charge current with a 10mΩ
sense resistor.

The charger utilizes a charge pump to control an n-channel
adapter selection switch. The charge pump remains
active even when the charger is off. When the adapter
is absent, a p-channel MOSFET selects the battery.

The MAX17005A/MAX17006A/MAX17015A are avail­able in a small, 4mm x 4mm x 0.8mm 20-pin, lead-free
TQFN package. An evaluation kit is available to reduce
design time.

Applications

Notebook Computers

Tablet PCs

Portable Equipment with Rechargeable Batteries

Features

o High Switching Frequency (1.2MHz)

o Controlled Inductor Current-Ripple Architecture

Reduced BOM Cost
Small Inductor and Output Capacitors

o ±0.4% Accurate Charge Voltage

o ±2.5% Accurate Input-Current Limiting

o ±3% Accurate Charge Current

o Single-Point Compensation

o Monitor Outputs for

±2.5% Accurate Input Current Limit
±2.5% Battery Discharge Current

(MAX17015A Only)

AC Adapter Detection

o Analog/PWM Adjustable Charge-Current Setting

o Battery Voltage Adjustable for 3 and 4 Cells

(MAX17005A) or 2 and 3 Cells (MAX17006A)

o Adjustable Battery Voltage (4.2V to 4.4V/Cell)

o Cycle-by-Cycle Current Limit

Battery Short-Circuit Protection
Fast Response for Pulse Charging
Fast System-Load-Transient Response

o Programmable Charge Current < 5A

o Automatic System Power Source Selection with

n-Channel MOSFET

o Internal Boost Diode

o +8V to +26V Input-Voltage Range

MAX17005A/MAX17006A/MAX17015A

1.2MHz, Low-Cost,

High-Performance Chargers

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-4355; Rev 0; 10/08

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.

+

Denotes a lead-free/RoHS compliant package.

*

Future product—contact factory for availability.

*

*

EP = Exposed pad.

PART TEMP RANGE

PIN-PACKAGE

MAX17005AETP+ -40°C to +85°C 20 TQFN-EP**

-40°C to +85°C 20 TQFN-EP**

MAX17015AETP+ -40°C to +85°C 20 TQFN-EP**

Pin Configuration and Minimal Operating Circuit appear at
end of data sheet.

*

Patent pending.

MAX17006AETP+*

MAX17005A/MAX17006A/MAX17015A

1.2MHz, Low-Cost,
High-Performance Chargers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V

DCIN

= V

CSSP

= V

CSSN

= 19V, V

BATT

= V

CSIP

= V

CSIN

= 16.8V, V

VCTL

= VAA, V

ISET

= 1V, TA= 0°C to +85°C,

unless otherwise noted. Typical values are at T

A

= +25°C.)

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.

DCIN, CSSP, CSSN, BATT, CSIN, CSIP, ACOK,

LX to AGND .......................................................-0.3V to +30V

BST to LDO.............................................................-0.3V to +30V

CSIP to CSIN, CSSP to CSSN .............................. -0.3V to +0.3V

IINP, FB, ACIN to AGND.............................-0.3V to (V

AA

+ 0.3V)

V

AA

, LDO, ISET, VCTL, CC to AGND .......................-0.3V to +6V

DHI to LX ....................................................-0.3V to (BST + 0.3V)

BST to LX..................................................................-0.3V to +6V

DLO to PGND ............................................-0.3V to (LDO + 0.3V)

PGND to AGND .................................................... -0.3V to +0.3V

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TQFN (derate 16.9mW/°C above +70°C)....1349.1mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

CHARGE-VOLTAGE REGULATION

2 cel ls, V

VCTL

= GND (MAX17006A) 8.3664 8.40 8.4336

3 cells, V

VCTL

= VAA (MAX17005A/MAX17006A) 12.549 12.60 12.651

4 cel ls, V

VCTL

= GND (MAX17005A) 16.733 16.80 16.867

Battery Regulation-Voltage Accuracy

FB accuracy using FB divider (MAX17015A)
(Note 1)

2.0916 2.1 2.1084

V

FB Input Bias Curent -1 +1 μA

2 cells (MAX17006A), 4 cells (MAX17005A) 0

V

AA

/2

-0.2

VCTL Range

3 cells (MAX17005A/MAX17006A)

VAA/2

+0.2

V

AA

V

VCTL Gain V

CELL/VVCTL

5.85 6 6.15 V/V

VCTL Input Bias Current V

VCTL

= GND and VCTL = V

AA

-1 +1 μA

CHARGE-CURRENT REGULATION

ISET Range 0 VAA/2 V

ISET = 1.4V 80

ISET Full-Scale Setting

ISET = 99.9% duty cycle 60

mV

58.2 60 61.8 mV

V

ISET

= VAA/4 or ISET

= 99.9% duty cycle

-3 +3 %

38.2 40 41.8 mV

Ful l-Charge Current Accurac y
(CSIP to CSIN)

V

ISET

= VAA/6 or ISET

= 66.7% duty cycle

-4.5 +4.5 %

1.4 3 4.6 mV

Trickle Charge-Current Accuracy

V

BATT

= 1V to 16.8V

V

ISET

= VAA/80 or ISET

= 5% duty cycle

-52 +52 %

Charge-Current Gain Error Based on V

ISET

= V

VAA

/4 and V

ISET

= V

VAA

/80 -2 +2 %

Charge-Current Offset Error Based on V

ISET

= V

VAA

/4 and V

ISET

= V

VAA

/80 -1.4 +1.4 mV

BATT/CSIP/CSIN Input-Voltage Range 0 24 V

ISET falling 21 26 31

ISET Power-Down Mode Threshold

ISET rising 33 40 47

mV

MAX17005A/MAX17006A/MAX17015A

1.2MHz, Low-Cost,

High-Performance Chargers

_______________________________________________________________________________________ 3

PARAMETER CONDITIONS MIN TYP MAX UNITS

V

ISET

= 3V -0.2 +0.2

ISET Input Bias Current

CSSN = BATT, V

ISET

= 5V -0.2 +0.2

μA

Ri sing 2.4

ISET PWM Threshold

Fal ling 0.8

V

ISET Frequency 0.128 500 kHz

ISET Effecti ve Resolut ion f

PWM

= 3.2MHz 8 Bits

INPUT-CURRENT REGULATION

58.5 60 61.5 mV

Input Current-Limit Thresho ld V

CSSP

- V

CSSN

-2.5 +2.5 %

CSSN Input Bias Current Adapter present -0.1 +0.1 μA

CSSP/CSSN Input-Voltage Range 8.0 26.0 V

IINP Transconductance V

CSSP

- V

CSSN

= 60mV 2.66 2.8 2.94 μA/mV

V

CSSP

- V

CSSN

= 60mV, V

IINP

= 0 to 4.5V -2.5 +2.5

IINP Accuracy

V

CSSP

- V

CSSN

= 35mV -2.5 +2.5

%

SUPPLY AND LINEAR REGULATOR

DCIN Input-Voltage Range 8 26 V

DCIN falling 7.9 8.1

DCIN Undervoltage-Lockout (UVLO) Trip-Point

DCIN rising 8.7 8.9

V

Adapter present (Note 2) 3 6 mA

DCIN + CSSP + CSSN Quiescent Current

Adapter absent (Note 2) 30 50 μA

Adapter absent (Note 2) 10 20

V

BATT

= 16.8V

Charger shutdown (Note 2) 10 20

BATT + CSIP + CSIN + LX Input Current

V

BATT

= 2V to 19V, adapter present (Note 2) 200 500

μA

LDO Output Voltage 8.0V < V

DCIN

< 26V, no load 5.15 5.35 5.55 V

LDO Load Regulation 0 < I

LDO

< 40mA 100 200 mV

LDO UVLO Threshold 3.2 4.1 5.0 V

REFERENCES

VAA Output Voltage I

VAA

= 50μA 4.18 4.20 4.22 V

VAA UVLO Threshold VAA falling 3.1 3.9 V

ACIN

ACIN Thresho ld 2.058 2.1 2.142 V

ACIN Threshold Hysteresi s 10 20 30 mV

ACIN Input Bias Current -1 +1 μA

ACOK

ACOK Sink Current V

ACOK

= 0.4V, V

ACIN

= 1.5V 6 mA

ACOK Leakage Current V

ACOK

= 5.5V, V

ACIN

= 2.5V 1 μA

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

DCIN

= V

CSSP

= V

CSSN

= 19V, V

BATT

= V

CSIP

= V

CSIN

= 16.8V, V

VCTL

= VAA, V

ISET

= 1V, TA= 0°C to +85°C,

unless otherwise noted. Typical values are at T

A

= +25°C.)

MAX17005A/MAX17006A/MAX17015A

1.2MHz, Low-Cost,
High-Performance Chargers

4 _______________________________________________________________________________________

PARAMETER CONDITIONS MIN TYP MAX UNITS

SWITCHING REGULATOR

DHI Off-Time K Factor V

DCIN

= 19V, V

BATT

= 10V 0.029 0.030 0.041 μs/V

Sense Voltage for Minimum Discontinuous
Mode Ripple Current

V

CSIP

- V

CSIN

10 mV

Zero-Crossing Comparator Threshold V

CSIP

- V

CSIN

10 mV

Cycle-by-Cycle Current-Limit Sense Voltage V

CSIP

- V

CSIN

105 110 115 mV

DHI Resistance High I

DLO

= 10mA 1.5 3 

DHI Resistance Low I

DLO

= -10mA 0.8 1.75 

DLO Resistance High I

DLO

= 10mA 3 6 

DLO Resistance Low I

DLO

= -10mA 3 7 

ADAPTER DETECTION

Adapter Absence-Detect Threshold V

DCIN

- V

BATT

, V

DCIN

falling +70 +120 +170 mV

Adapter Detect Threshold V

DCIN

- V

BATT, VDCIN

rising +360 +420 +580 mV

Adapter Switch C harge-Pump Frequency Charger Shutdown 180 200 220 Hz

DLO 0.04 0.1 0.20

Adapter Switch Charge-Pump Refresh Pulse

DHI 0.07 0.15 0.30

μs

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

DCIN

= V

CSSP

= V

CSSN

= 19V, V

BATT

= V

CSIP

= V

CSIN

= 16.8V, V

VCTL

= VAA, V

ISET

= 1V, TA= 0°C to +85°C,

unless otherwise noted. Typical values are at T

A

= +25°C.)

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V

DCIN

= V

CSSP

= V

CSSN

= 19V, V

BATT

= V

CSIP

= V

CSIN

= 16.8V, V

VCTL

= VAA, V

ISET

= 1V, TA= -40°C to +85°C,

unless otherwise noted.)

PARAMETER CONDITIONS MIN TYP MAX UNITS

CHARGE-VOLTAGE REGULATION

2 cel ls, V

VCTL

= GND (MAX17006A) 8.366 8.433

3 cel ls, V

VCTL

= VAA (MAX17005A/MAX17006A) 12.549 12.651

4 cel ls, V

VCTL

= GND (MAX17005A) 16.73 16.86

Battery Regulation-Voltage Accuracy

FB accuracy using FB divider (MAX17015A)
(Note 1)

2.091 2.108

V

2 cells (MAX17006A),
4 cells (MAX17005A)

0.

V

AA

/2

- 0.2

VCTL Range

3 cells (MAX17005A/MAX17006A)

V

AA

/2

+ 0.2

V

AA

V

VCTL Gain V

CELL/VVCTL

5.85 6.15 V/V

MAX17005A/MAX17006A/MAX17015A

1.2MHz, Low-Cost,

High-Performance Chargers

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

DCIN

= V

CSSP

= V

CSSN

= 19V, V

BATT

= V

CSIP

= V

CSIN

= 16.8V, V

VCTL

= VAA, V

ISET

= 1V, TA= -40°C to +85°C,

unless otherwise noted.)

PARAMETER CONDITIONS MIN TYP MAX UNITS

CHARGE-CURRENT REGULATION

ISET Range 0 VAA/2 V

57.5 62.5 mV

V

ISET

= VAA/4 or

ISET = 99.9% duty cycl e

-4.2 +4.2 %

38 42 mV

Ful l Charge-Current Accurac y
(CSIP to CSIN)

V

ISET

= VAA/6 or

ISET = 66.7% duty cycl e

-5 +5 %

1.4 4.6 mV

Trickle Charge-Current Accuracy

V

BATT

= 1V to 16.8V

V

ISET

= VAA/80 or

ISET = 5% duty cycle

-52 +52 %

Charge-Current Gain Error Based on V

ISET

= V

VAA

/4 and V

ISET

= V

VAA

/80 -2 +2 %

Charge-Current Offset Error Ba sed on V

ISET

= V

VAA

/4 and V

ISET

= V

VAA

/80 -1.4 +1.4 mV

BATT/CSIP/CSIN Input-Voltage Range 0 24 V

ISET falling 21 31

ISET Power-Down Mode Threshold

ISET ris ing 33 47

mV

Ri sing 2.4

ISET PWM Threshold

Fal ling 0.8

V

ISET Frequency 0.128 500 kHz

INPUT-CURRENT REGULATION

58.2 61.8 mV

Input Current-Limit Thresho ld V

CSSP

- V

CSSN

-3 +3 %

CSSN Input Bias Current Adapter present -2 +2 μA

CSSP/CSSN Input-Voltage Range 8.0 26.0 V

IINP Transconductance V

CSSP

- V

CSSN

= 60mV 2.66 2.94 μA/mV

V

CSSP

- V

CSSN

= 60mV, V

IINP

= 0 to 4.5V -2.5 +2.5

IINP Accuracy

V

CSSP

- V

CSSN

= 35mV -2.5 +2.5

%

SUPPLY AND LINEAR REGULATOR

DCIN Input-Voltage Range 8 26 V

DCIN falling 7.9

DCIN UVLO Trip-Point

DCIN rising 8.9

V

Adapter present (Note 2) 6 mA

DCIN + CSSP + CSSN Quiescent Current

Adapter absent (Note 2) 50 μA

Adapter absent (Note 2) 20

V

BATT

= 16.8V

Charger shutdown (Note 2) 20

BATT + CSIP + CSIN + LX Input Current

V

BATT

= 2V to 19V, adapter present (Note 2) 500

μA

LDO Output Voltage 8.0V < V

DCIN

< 26V, no load 5.15 5.55 V

LDO Load Regulation 0 < I

LDO

< 40mA 200 mV

LDO UVLO Threshold 3.2 5.0 V

MAX17005A/MAX17006A/MAX17015A

1.2MHz, Low-Cost,
High-Performance Chargers

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

DCIN

= V

CSSP

= V

CSSN

= 19V, V

BATT

= V

CSIP

= V

CSIN

= 16.8V, V

VCTL

= VAA, V

ISET

= 1V, TA= -40°C to +85°C,

unless otherwise noted.)

PARAMETER CONDITIONS MIN TYP MAX UNITS

REFERENCES

VAA Output Voltage I

VAA

= 50μA 4.18 4.22 V

VAA UVLO Thresho ld VAA falling 3.9 V

ACIN

ACIN Thresho ld 2.058 2.142 V

ACIN Thresho ld Hysteresis 10 30 mV

ACOK

ACOK Sink Current V

ACOK

= 0.4V, V

ACIN

= 1.5V 6 mA

SWITCHING REGULATOR

DHI Off-Time K Factor V

DCIN

= 19V, V

BATT

= 10V 0.029 0.041 μs/V

Cycle-by-Cycle Current-Limit Sense Voltage V

CSIP

- V

CSIN

105 115 mV

DHI Resistance High I

DLO

= 10mA 3 

DHI Resistance Low I

DLO

= -10mA 1.75 

DLO Resistance High I

DLO

= 10mA 6 

DLO Resistance Low I

DLO

= -10mA 7 

ADAPTER DETECTION

Adapter Absence-Detect Threshold V

DCIN

- V

BATT

, V

DCIN

falling +70 +170 mV

Adapter Detect Threshold V

DCIN

- V

BATT, VDCIN

rising +320 +620 mV

Adapter Switch C harge-Pump Frequency 180 220 Hz

DLO 0.04 0.2

Adapter Switch Charge-Pump Refresh Pulse

DHI 0.07 0.3

μs

Note 1: Accuracy does not include errors due to external resistance tolerances.
Note 2: Adapter present conditions are tested at V

DCIN

= 19V and V

BATT

= 16.8V. Adapter absent conditions are tested at

V

DCIN

= 16V, V

BATT

= 16.8V.

MAX17005A/MAX17006A/MAX17015A

1.2MHz, Low-Cost,

High-Performance Chargers

_______________________________________________________________________________________ 7

Typical Operating Characteristics

(Circuit of Figure 1, adapter = 19V, battery = 10V, ISET = 1.05V, V

CTL

= GND, TA= +25°C, unless otherwise noted.)

IINP DC ERROR

vs. SYSTEM CURRENT

MAX17005A toc01

SYSTEM CURRENT (A)

IINP ERROR (%)

4312

-8

-6

-4

-2

0

2

4

6

8

10

-10
05

IINP ERROR

vs. SYSTEM CURRENT

MAX17005A toc02

SYSTEM CURRENT (A)

IINP ERROR (%)

4.03.52.5 3.01.0 1.5 2.00.5

-8

-6

-4

-2

0

2

4

6

8

10

-10

04.5

V

BATT

= 16.8V

V

BATT

= 8.4V

V

BATT

= 12.6V

ISET PWM DUTY-CYCLE CHANGE

MAX17005A toc03

DUTY CYCLE

CHARGE-CURRENT ERROR (%)

0.8 0.90.1 0.2 0.3 0.4 0.5 0.6 0.7

0.5

1.0

1.5

2.0

2.5

3.0

0

01.0

ISET PWM DUTY-CYCLE CHANGE

MAX17005A toc04

DUTY CYCLE

CHARGE CURRENT (A)

80 9010 20 30 40 50 60 70

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0

0100

ISET PWM FREQUENCY SWEEP

MAX17005A toc05

FREQUENCY (kHz)

CHARGE-CURRENT ERROR (%)

600 700100 200 300 400 500

0.5

1.0

1.5

2.0

2.5

3.0

0

0 800

DUTY CYCLE = 75%

DUTY CYCLE = 25%

BATTERY VOLTAGE-SETTING ERROR

MAX17005A toc06

VCTL (V)

BATTERY VOLTAGE ERROR (%)

3.0 3.5 4.00.5 1.0 1.5 2.0 2.5

-0.5

-0.4

-0.3

-0.2

-0.1

0

-0.6

04.5

SYSTEM LOAD TRANSIENT

MAX17005A toc07

200μs/div

SYSTEM
CURRENT
5A/div

CHARGING
CURRENT
5A/div

INDUCTOR
CURRENT
5A/div

EFFICIENCY

vs. CHARGE CURRENT

MAX17005A toc08

CHARGE CURRENT (A)

EFFICIENCY (%)

2.5 3.0 3.50.5 1.0 1.5 2.0

70

65

75

80

85

95

90

100

60

04.0

2 CELLS

3 CELLS

4 CELLS