MAX1647 Maxim, MAX1647 Datasheet - Page 11

• Manufacturer Part Number: MAX1647
• Description: Chemistry-Independent Battery Chargers
• Manufacturer: Maxim

Table 1b. Component Suppliers
Figure 4. MAX1648 Typical Operating Circuit
AVX
Central Semiconductor
Coilcraft
Coiltronics
Dale
IR
IRC
NIEC
Siliconix
Sprague
Sumida
Zetex
MANUFACTURER
R8
R9
R10
R11
R3
______________________________________________________________________________________
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
C2
C3
R4
R2
PHONE
SETV
THM
CCI
CCV
SETI
MAX1648
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
REF
FAX
C4
PGND
AGND
DCIN
BATT
DLO
BST
DHI
CS
VL
LX
C6
Chemistry-Independent
The MAX1647/MAX1648 contain both a voltage-
regulation loop and a current-regulation loop. Both
loops operate independently of each other. The volt-
age-regulation loop monitors BATT to ensure that its
voltage never exceeds the voltage set point (V0). The
current-regulation loop monitors current delivered to
BATT to ensure that it never exceeds the current-limit
set point (I0). The current-regulation loop is in control
as long as BATT voltage is below V0. When BATT volt-
age reaches V0, the current loop no longer regulates,
and the voltage-regulation loop takes over. Figure 5
shows the V-I characteristic at the BATT pin.
_______________Detailed Description
M2
R5
D2
C7
M1
Battery Chargers
C5
C1
D1
T
Output Characteristics
L1
D4
DC SOURCE
D3
R1
BATTERY
7.5V–28V
11