Rainbow Electronics MAX8724 - Manual (Page 5)

MAX1908/MAX8724
Low-Cost Multichemistry Battery Chargers
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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 = float, 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 = 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GMS Amplifier Transconductance GMS V CLS = V REF , V CSSP - V CSSN = 75mV 0.5 1 2.0 µA/mV
CCI, CCS, CCV Clamp Voltage 0.25V < V CCV,CCS,CCI < 2V 150 300 600 mV
LOGIC LEVELS
CELLS Input Low Voltage 0.4 V
CELLS Input Float Voltage CELLS = float
(V REFIN
/ 2) -
0.2V
V REFIN
/ 2
( V R E F IN
/ 2) +
0.2V
V
CELLS Input High Voltage
V REFIN
- 0.4V
V
CELLS Input Bias Current CELLS = 0 or V REFIN -2 +2 µA
ACOK AND SHDN
ACOK Input Voltage Range 0 28 V
ACOK Sink Current V ACOK = 0.4V, V ACIN = 3V 1 mA
ACOK Leakage Current V ACOK = 28V, V ACIN = 0 1 µA
SHDN Input Voltage Range 0 LDO V
V SHDN = 0 or V LDO -1 +1
SHDN Input Bias Current
V DCIN = 0, V SHDN = 5V -1 +1
µA
SHDN Threshold V SHDN falling 22 23.5 25
% of
V REFIN
SHDN Threshold Hysteresis 1
% of
V REFIN