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PDF MAX1870A Data sheet ( Hoja de datos )
| Número de pieza | MAX1870A | |
| Descripción | Step-Up / Step-Down Li+ Battery Charger | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3243; Rev 0; 4/04
EVAALVUAAILTAIOBNLEKIT
Step-Up/Step-Down
Li+ Battery Charger
General Description
The MAX1870A step-up/step-down multichemistry bat-
tery charger charges with battery voltages above and
below the adapter voltage. This highly integrated
charger requires a minimum number of external compo-
nents. The MAX1870A uses a proprietary step-up/step-
down control scheme that provides efficient charging.
Analog inputs control charge current and voltage, and
can be programmed by the host or hardwired.
The MAX1870A accurately charges two to four lithium-
ion (Li+) series cells at greater than 4A. A programma-
ble input current limit is included, which avoids
overloading the AC adapter when supplying the load
and the battery charger simultaneously. This reduces
the maximum adapter current, which reduces cost. The
MAX1870A provides analog outputs to monitor the cur-
rent drawn from the AC adapter and charge current. A
digital output indicates the presence of an AC adapter.
When the adapter is removed, the MAX1870A con-
sumes less than 1µA from the battery.
The MAX1870A is available in a 32-pin thin QFN (5mm
x 5mm) package and is specified over the -40°C to
+85°C extended temperature range. The MAX1870A
evaluation kit (MAX1870AEVKIT) is available to help
reduce design time.
Applications
Notebook and Subnotebook Computers
Hand-Held Terminals
*Protected by U.S. Patent No. 6,087,816.
Features
♦ Patented Step-Up/Step-Down Control Scheme*
♦ ±0.5% Charge-Voltage Accuracy
♦ ±9% Charge-Current Accuracy
♦ ±8% Input Current-Limit Accuracy
♦ Programmable Maximum Battery Charge Current
♦ Analog Inputs Control Charge Current, Charge
Voltage, and Input Current Limit
♦ Analog Output Indicates Adapter Current
♦ Input Voltage from 8V to 28V
♦ Battery Voltage from 0 to 17.6V
♦ Charges Li+ or NiCd/NiMH Batteries
♦ Tiny 32-Pin Thin QFN (5mm x 5mm) Package
PART
MAX1870AETJ
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
32 Thin QFN
Typical Operating Circuit
FROM WALL ADAPTER
CSSS
DCIN
VHP
CSSP
CSSN
VHN MAX1870A DHI
REF
CLS
CELLS
ASNS
IINP
DBST
CSIP
CSIN
REFIN
SHDN
ICTL
VCTL
LDO
DLOV
BATT
BLKP
PGND
GND
P
SYSTEM
LOAD
N
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Step-Up/Step-Down
Li+ Battery Charger
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, VDCIN = VCSSP = VCSSN = VCSSS = VVHP = 18V, VBATT = VCSIP = VCSIN = VBLKP = 12V, VREFIN = 3.0V, VICTL =
0.75 x VREFIN, VCTL = LDO, CELLS = FLOAT, GND = PGND = 0, VDLOV = 5.4V, TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
GMS Amplifier Loop
Transconductance
CCV Output Current
CCI Output Current
CCS Output Current
CCI/CCS/CCV Clamp Voltage
LOGIC LEVELS
ASNS Output-Voltage Low
ASNS Output-Voltage High
CONDITIONS
VCLS = REF, VCSSP - VCSSN = 102mV, VCSSP = VCSSS
VCLS = REF, VCSSP - VCSSS = 102mV, VCSSP = VCSSN
VCTL = REFIN, VBATT = 15.8V
VCTL = REFIN, VBATT = 17.8V
ICTL = REFIN, VCSIP - VCSIN = 0mV
ICTL = REFIN, VCSIP - VCSIN = 150mV
CLS = REF, VCSSP = VCSSN, VCSSP = VCSSS
CLS = REF, VCSSP - VCSSN = 200mV,
VCSSP - VCSSS = 200mV
1.1V < VCCV < 3.5V, 1.1V < VCCS < 3.5V,
1.1V < VCCI < 3.5V
VIINP = GND, ISINK = 1mA
VIINP = 4V, ISOURCE = 1mA
MIN TYP MAX UNITS
1.2 1.7 2.2
µA/mV
1.2 1.7 2.2
50
µA
-50
150
µA
-150
100
-100
µA
100 300 500
mV
LDO -
0.5
0.4 V
V
ASNS Current Detect
SHDN Input Bias Current
SHDN Threshold
VIINP rising
Hysteresis
VSHDN = 0 to VREFIN
DCIN = 0, VREFIN = 5V, VSHDN = 0 to VREFIN
SHDN falling, VREFIN = 2.8V to 3.6V
1.1 1.15 1.2
50
-1 +1
-1 +1
V
mV
µA
22
23.5
25
% of
REFIN
SHDN Hysteresis
1
% of
REFIN
CELLS Input Low Voltage
0.75 V
CELLS Float Voltage
40 50 60 % of
REFIN
CELLS Input High Voltage
REFIN -
0.75V
V
CELLS Input Bias Current
CELLS = 0 to REFIN
-2 +2 µA
_______________________________________________________________________________________ 5
5 Page 
Step-Up/Step-Down
Li+ Battery Charger
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VDCIN = 16V, CELLS = REFIN, VCLS =VREF, VICTL = VREFIN = 3.3V, TA = +25°C, unless otherwise noted.)
4.11
4.10
4.09
4.08
4.07
4.06
4.05
4.04
4.03
0
REF LOAD REGULATION
500 1000 1500 2000
LOAD CURRENT (µA)
2500
REFERENCE ERROR vs. TEMPERATURE
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
5.38
5.36
5.34
5.32
5.30
5.28
5.26
5.24
0
LDO LOAD REGULATION
VIN = 28V
VIN = 16V
VIN = 9V
10 20 30 40
LOAD (mA)
LDO vs. TEMPERATURE
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
180
160
140
120
100
80
60
40
20
0
0
OUTPUT VOLTAGE RIPPLE
vs. BATTERY VOLTAGE
5 10 15
VBATT (V)
20
50
STEP-UP/STEP-DOWN
SWITCHING WAVEFORM
VIN = 16V
VBATT = 16V
2.00µs
20V
10V
D4 CATHODE
0V
10V
D3 ANODE
0V
4A
INDUCTOR CURRENT
2A
VBATT
(AC-COUPLED)
200mV/div
STEP-DOWN
SWITCHING WAVEFORM
VIN = 16V
VBATT = 12V
2.00µs
20V
10V
D4 CATHODE
0V
10V
D3 ANODE
0V
4A
INDUCTOR CURRENT
2A
VBATT
(AC-COUPLED)
10mV/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1870A.PDF ] | |
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