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ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - battery management Charge management Multi-Chemistry TQFN 28 (5x5) Surface-mount
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Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)
(V
DCIN
= V
CSSP
= V
CSSN
= 18V, V
BATT
= V
CSIP
= V
CSIN
= 12V, V
REFIN
= 3V, V
VCTL
= V
ICTL
= 0.75 x V
REFIN
, CELLS = open, CLS =
REF, V
BST
- V
LX
= 4.5V, ACIN = GND = PGND = 0, C
LDO
= 1µF, LDO = DLOV, C
REF
= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ERROR AMPLIFIERS
GMV Amplifier Transconductance GMV
V
V C T L
= V
LD O
, V
BAT T
= 16.8V ,
C E LLS = V
RE F IN
0.0625 0.250 µA/mV
GMI Amplifier Transconductance GMI V
ICTL
= V
RE F IN
, V
CSIP
- V
CSIN
= 75mV 0.5 2.0 µA/mV
GMS Amplifier Transconductance GMS V
CLS
= V
REF
, V
CSSP
- V
CSSN
= 75mV 0.5 2.0 µA/mV
CCI, CCS, CCV Clamp Voltage 0.25V < V
CCV,CCS,CCI
< 2V 150 600 mV
LOGIC LEVELS
CELLS Input Low Voltage 0.4 V
CELLS Input Open Voltage CELLS = open
(V
REFIN
/2) -
0.2V
( V
R E F IN
/2) +
0.2V
V
CELLS Input High Voltage
V
REFIN
- 0.4V
V
ACOK AND SHDN
ACOK Input Voltage Range 0 28 V
ACOK Sink Current V
ACOK
= 0.4V, V
ACIN
= 3V 1 mA
SHDN Input Voltage Range 0 LDO V
SHDN Threshold V
SHDN
falling 22 25
% of
V
REFIN
Note 1: If both ICTL and VCTL use default mode (connected to LDO), REFIN is not used and can be connected to LDO.
Note 2: Specifications to T
A
= -40°C are guaranteed by design and not production tested.
LOAD-TRANSIENT RESPONSE
(BATTERY INSERTION AND REMOVAL)
MAX1908 toc01
1ms/div
I
BATT
2A/div
V
BATT
5V/div
V
CCI
500mV/div
V
CCV
500mV/div
ICTL = LDO
VCTL = LDO
CCV
CCI
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc02
1ms/div
V
BATT
2V/div
V
CCI
500mV/div
V
CCS
500mV/div
16.8V
0
0
LOAD
CURRENT
5A/div
ADAPTER
CURRENT
5A/div
ICTL = LDO
CHARGING CURRENT = 3A
V
BATT
= 16.8V
LOAD STEP = 0 TO 4A
I
SOURCE
LIMIT = 5A
CCS
CCS
CCI
CCI
V
BATT
2V/div
0
0
0
CHARGE
CURRENT
2A/div
LOAD
CURRENT
5A/div
ADAPTER
CURRENT
5A/div
LOAD-TRANSIENT RESPONSE
(STEP IN-LOAD CURRENT)
MAX1908 toc03
1ms/div
ICTL = LDO
CHARGING CURRENT = 3A
V
BATT
= 16.8V
LOAD STEP = 0 TO 4A
I
SOURCE
LIMIT = 5A
Typical Operating Characteristics
(Circuit of Figure 1, V
DCIN
= 20V, T
A
= +25°C, unless otherwise noted.)
MAX1908/MAX8724/MAX8765/MAX8765A
10