19-4355; Rev 0; 10/08
1.2MHz, Low-Cost,
High-Performance Chargers
General Description
The MAX17005A/MAX17006A/MAX17015A are high-fre-
quency 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 syn-
chronous rectifier. Widely adjustable charge current,
charge voltage, and input current limit simplify the con-
struction 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 cur-
rent-sense amplifiers provide fast cycle-by-cycle cur-
rent-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 ana-
log output that is proportional to the adapter current. In
the MAX17015A, this current monitor remains active
when the adapter is absent to monitor battery dis-
charge 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 set-
ting and the number of cells through a feedback resis-
tor-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 avail-
able in a small, 4mm x 4mm x 0.8mm 20-pin, lead-free
TQFN package. An evaluation kit is available to reduce
design time.
♦
High Switching Frequency (1.2MHz)
♦
Controlled Inductor Current-Ripple Architecture
Reduced BOM Cost
Small Inductor and Output Capacitors
♦
±0.4% Accurate Charge Voltage
♦
±2.5% Accurate Input-Current Limiting
♦
±3% Accurate Charge Current
♦
Single-Point Compensation
♦
Monitor Outputs for
±2.5% Accurate Input Current Limit
±2.5% Battery Discharge Current
(MAX17015A Only)
AC Adapter Detection
♦
Analog/PWM Adjustable Charge-Current Setting
♦
Battery Voltage Adjustable for 3 and 4 Cells
(MAX17005A) or 2 and 3 Cells (MAX17006A)
♦
Adjustable Battery Voltage (4.2V to 4.4V/Cell)
♦
Cycle-by-Cycle Current Limit
Battery Short-Circuit Protection
Fast Response for Pulse Charging
Fast System-Load-Transient Response
♦
Programmable Charge Current < 5A
♦
Automatic System Power Source Selection with
n-Channel MOSFET
♦
Internal Boost Diode
♦
+8V to +26V Input-Voltage Range
Features
MAX17005A/MAX17006A/MAX17015A
Applications
Notebook Computers
Tablet PCs
Portable Equipment with Rechargeable Batteries
PART
MAX17005AETP+
MAX17006AETP+*
MAX17015AETP+
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 TQFN-EP**
20 TQFN-EP**
20 TQFN-EP**
+Denotes
a lead-free/RoHS compliant package.
*Future
product—contact factory for availability.
**EP = Exposed pad.
Pin Configuration and Minimal Operating Circuit appear at
end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
1.2MHz, Low-Cost,
High-Performance Chargers
MAX17005A/MAX17006A/MAX17015A
ABSOLUTE MAXIMUM RATINGS
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
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
(Circuit of Figure 1, V
DCIN
= V
CSSP
= V
CSSN
= 19V, V
BATT
= V
CSIP
= V
CSIN
= 16.8V, V
VCTL
= V
AA
, V
ISET
= 1V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
CHARGE-VOLTAGE REGULATION
2 cells, V
VCTL
= GND (MAX17006A)
3 cells, V
VCTL
= V
AA
(MAX17005A/MAX17006A)
Battery Regulation-Voltage Accuracy
4 cells, V
VCTL
= GND (MAX17005A)
FB accuracy using FB divider (MAX17015A)
(Note 1)
FB Input Bias Curent
2 cells (MAX17006A), 4 cells (MAX17005A)
VCTL Range
3 cells (MAX17005A/MAX17006A)
VCTL Gain
VCTL Input Bias Current
CHARGE-CURRENT REGULATION
ISET Range
ISET Full-Scale Setting
ISET = 1.4V
ISET = 99.9% duty cycle
V
ISET
= V
AA
/4 or ISET
= 99.9% duty cycle
V
BATT
= 1V to 16.8V
Trickle Charge-Current Accuracy
Charge-Current Gain Error
Charge-Current Offset Error
BATT/CSIP/CSIN Input-Voltage Range
ISET Power-Down Mode Threshold
ISET falling
ISET rising
V
ISET
= V
AA
/6 or ISET
= 66.7% duty cycle
V
ISET
= V
AA
/80 or ISET
= 5% duty cycle
Based on V
ISET
= V
VAA
/4 and V
ISET
= V
VAA
/80
Based on V
ISET
= V
VAA
/4 and V
ISET
= V
VAA
/80
58.2
-3
38.2
-4.5
1.4
-52
-2
-1.4
0
21
33
26
40
3
40
0
80
60
60
61.8
+3
41.8
+4.5
4.6
+52
+2
+1.4
24
31
47
V
AA
/2
V
mV
mV
%
mV
%
mV
%
%
mV
V
mV
V
CELL
/V
VCTL
V
VCTL
= GND and VCTL = V
AA
V
AA
/2
+0.2
5.85
-1
6
V
AA
6.15
+1
V/V
μA
8.3664
12.549
16.733
2.0916
-1
0
8.40
8.4336
V
12.60 12.651
16.80 16.867
2.1
2.1084
+1
V
AA
/2
-0.2
V
μA
CONDITIONS
MIN
TYP
MAX
UNITS
Full-Charge Current Accuracy
(CSIP to CSIN)
2
_______________________________________________________________________________________
1.2MHz, Low-Cost,
High-Performance Chargers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
DCIN
= V
CSSP
= V
CSSN
= 19V, V
BATT
= V
CSIP
= V
CSIN
= 16.8V, V
VCTL
= V
AA
, V
ISET
= 1V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ISET Input Bias Current
ISET PWM Threshold
ISET Frequency
ISET Effective Resolution
INPUT-CURRENT REGULATION
Input Current-Limit Threshold
CSSN Input Bias Current
CSSP/CSSN Input-Voltage Range
IINP Transconductance
IINP Accuracy
SUPPLY AND LINEAR REGULATOR
DCIN Input-Voltage Range
DCIN Undervoltage-Lockout (UVLO) Trip-Point
DCIN + CSSP + CSSN Quiescent Current
DCIN falling
DCIN rising
Adapter present (Note 2)
Adapter absent (Note 2)
V
BATT
= 16.8V
Adapter absent (Note 2)
Charger shutdown (Note 2)
5.15
3.2
I
VAA
= 50μA
V
AA
falling
2.058
10
-1
V
ACOK
= 0.4V, V
ACIN
= 1.5V
V
ACOK
= 5.5V, V
ACIN
= 2.5V
6
1
4.18
8
7.9
8.1
8.7
3
30
10
10
200
5.35
100
4.1
4.20
3.1
2.1
20
8.9
6
50
20
20
500
5.55
200
5.0
4.22
3.9
2.142
30
+1
V
mV
V
V
V
V
mV
μA
mA
μA
μA
26
V
V
mA
μA
V
CSSP
- V
CSSN
= 60mV
V
CSSP
- V
CSSN
= 60mV, V
IINP
= 0 to 4.5V
V
CSSP
- V
CSSN
= 35mV
V
CSSP
- V
CSSN
Adapter present
58.5
-2.5
-0.1
8.0
2.66
-2.5
-2.5
2.8
60
61.5
+2.5
+0.1
26.0
2.94
+2.5
+2.5
mV
%
μA
V
μA/mV
%
f
PWM
= 3.2MHz
V
ISET
= 3V
CSSN = BATT, V
ISET
= 5V
Rising
Falling
CONDITIONS
MIN
-0.2
-0.2
0.8
0.128
8
500
TYP
MAX
+0.2
+0.2
2.4
UNITS
μA
V
kHz
Bits
MAX17005A/MAX17006A/MAX17015A
BATT + CSIP + CSIN + LX Input Current
LDO Output Voltage
LDO Load Regulation
LDO UVLO Threshold
REFERENCES
V
AA
Output Voltage
V
AA
UVLO Threshold
ACIN
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
ACOK
ACOK
Sink Current
ACOK
Leakage Current
V
BATT
= 2V to 19V, adapter present (Note 2)
8.0V < V
DCIN
< 26V, no load
0 < I
LDO
< 40mA
_______________________________________________________________________________________
3
1.2MHz, Low-Cost,
High-Performance Chargers
MAX17005A/MAX17006A/MAX17015A
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
DCIN
= V
CSSP
= V
CSSN
= 19V, V
BATT
= V
CSIP
= V
CSIN
= 16.8V, V
VCTL
= V
AA
, V
ISET
= 1V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SWITCHING REGULATOR
DHI Off-Time K Factor
Sense Voltage for Minimum Discontinuous
Mode Ripple Current
Zero-Crossing Comparator Threshold
DHI Resistance High
DHI Resistance Low
DLO Resistance High
DLO Resistance Low
ADAPTER DETECTION
Adapter Absence-Detect Threshold
Adapter Detect Threshold
Adapter Switch Charge-Pump Frequency
Adapter Switch Charge-Pump Refresh Pulse
V
DCIN
- V
BATT
, V
DCIN
falling
V
DCIN
- V
BATT,
V
DCIN
rising
Charger Shutdown
DLO
DHI
+70
+360
180
0.04
0.07
+120
+420
200
0.1
0.15
+170
+580
220
0.20
0.30
mV
mV
Hz
μs
V
DCIN
= 19V, V
BATT
= 10V
V
CSIP
- V
CSIN
0.029
0.030
10
10
105
110
1.5
0.8
3
3
115
3
1.75
6
7
0.041
μs/V
mV
mV
mV
CONDITIONS
MIN
TYP
MAX
UNITS
V
CSIP
- V
CSIN
Cycle-by-Cycle Current-Limit Sense Voltage V
CSIP
- V
CSIN
I
DLO
= 10mA
I
DLO
= -10mA
I
DLO
= 10mA
I
DLO
= -10mA
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
DCIN
= V
CSSP
= V
CSSN
= 19V, V
BATT
= V
CSIP
= V
CSIN
= 16.8V, V
VCTL
= V
AA
, V
ISET
= 1V,
T
A
= -40°C to +85°C,
unless otherwise noted.)
PARAMETER
CHARGE-VOLTAGE REGULATION
2 cells, V
VCTL
= GND (MAX17006A)
3 cells, V
VCTL
= V
AA
(MAX17005A/MAX17006A)
Battery Regulation-Voltage Accuracy
4 cells, V
VCTL
= GND (MAX17005A)
FB accuracy using FB divider (MAX17015A)
(Note 1)
2 cells (MAX17006A),
4 cells (MAX17005A)
3 cells (MAX17005A/MAX17006A)
VCTL Gain
V
CELL
/V
VCTL
8.366
12.549
16.73
2.091
0.
V
AA
/2
+ 0.2
5.85
8.433
12.651
16.86
2.108
V
AA
/2
- 0.2
V
AA
6.15
V/V
V
CONDITIONS
MIN
TYP
MAX
UNITS
VCTL Range
V
4
_______________________________________________________________________________________
1.2MHz, Low-Cost,
High-Performance Chargers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
DCIN
= V
CSSP
= V
CSSN
= 19V, V
BATT
= V
CSIP
= V
CSIN
= 16.8V, V
VCTL
= V
AA
, V
ISET
= 1V,
T
A
= -40°C to +85°C,
unless otherwise noted.)
PARAMETER
CHARGE-CURRENT REGULATION
ISET Range
Full Charge-Current Accuracy
(CSIP to CSIN)
V
BATT
= 1V to 16.8V
Trickle Charge-Current Accuracy
Charge-Current Gain Error
Charge-Current Offset Error
BATT/CSIP/CSIN Input-Voltage Range
ISET Power-Down Mode Threshold
ISET PWM Threshold
ISET Frequency
INPUT-CURRENT REGULATION
Input Current-Limit Threshold
CSSN Input Bias Current
CSSP/CSSN Input-Voltage Range
IINP Transconductance
IINP Accuracy
SUPPLY AND LINEAR REGULATOR
DCIN Input-Voltage Range
DCIN UVLO Trip-Point
DCIN + CSSP + CSSN Quiescent Current
DCIN falling
DCIN rising
Adapter present (Note 2)
Adapter absent (Note 2)
V
BATT
= 16.8V
Adapter absent (Note 2)
Charger shutdown (Note 2)
5.15
3.2
8
7.9
8.9
6
50
20
20
500
5.55
200
5.0
V
mV
V
μA
26
V
V
mA
μA
V
CSSP
- V
CSSN
= 60mV
V
CSSP
- V
CSSN
= 60mV, V
IINP
= 0 to 4.5V
V
CSSP
- V
CSSN
= 35mV
V
CSSP
- V
CSSN
Adapter present
58.2
-3
-2
8.0
2.66
-2.5
-2.5
61.8
+3
+2
26.0
2.94
+2.5
+2.5
mV
%
μA
V
μA/mV
%
ISET falling
ISET rising
Rising
Falling
0.8
0.128
500
V
ISET
= V
AA
/4 or
ISET = 99.9% duty cycle
V
ISET
= V
AA
/6 or
ISET = 66.7% duty cycle
V
ISET
= V
AA
/80 or
ISET = 5% duty cycle
Based on V
ISET
= V
VAA
/4 and V
ISET
= V
VAA
/80
Based on V
ISET
= V
VAA
/4 and V
ISET
= V
VAA
/80
0
57.5
-4.2
38
-5
1.4
-52
-2
-1.4
0
21
33
V
AA
/2
62.5
+4.2
42
+5
4.6
+52
+2
+1.4
24
31
47
2.4
V
mV
%
mV
%
mV
%
%
mV
V
mV
V
kHz
CONDITIONS
MIN
TYP
MAX
UNITS
MAX17005A/MAX17006A/MAX17015A
BATT + CSIP + CSIN + LX Input Current
LDO Output Voltage
LDO Load Regulation
LDO UVLO Threshold
V
BATT
= 2V to 19V, adapter present (Note 2)
8.0V < V
DCIN
< 26V, no load
0 < I
LDO
< 40mA
_______________________________________________________________________________________
5
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