Rainbow Electronics MAX8724 - Manual (Page 8)

MAX1908/MAX8724
Low-Cost Multichemistry Battery Chargers
8 _______________________________________________________________________________________
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 = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CELLS Input Float Voltage CELLS = float
(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 A COK = 0.4V, V ACIN = 3V 1 mA
SHDN Input Voltage Range 0 LDO V
SHDN Threshold V S HDN 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 -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
CCI
CCS
CCI
CCS
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
VBATT = 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.)