MAX17435 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX17435 Datasheet PDF : 27 Pages
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High-Frequency,
Low-Cost SMBus Chargers
ADAPTER
N3
RS1
Q1A
10mI
R9
R11
103kI
2MI
R4
150kI
R17
10I
C6
10nF
R18
1kI
N4
C10
1FF
GND
R10
10kI
ACOK
LDO
R5
10kI
C1
1FF
R16
10I
C3
1FF
R13
10kI
SMBus
CONTROL
C11
R14 1FF
10kI
DCIN PDSL
CSSP
ACIN
ACOK
LDO
VAA
GND
VCC
MAX17435
MAX17535
CSSN
BST
DHI
LX
DLO
PGND PAD
CSIP
CSIN
BATT
CC
IINP
SCL
SDA
ADAPTLIM
ITHR
EN
R12
10kI
LDO
Q1B
SYSTEM LOAD
C4
0.1FF
N1
CIN
CIN = 2 x 4.7FF
COUT = 4.7FF
L1 = 2FH
N2
L1
RS2
10mI
C5
0.01FF
C2
0.1FF
COUT
BATTERY
IINP VOLTAGE
LDO
R6
7.06kI
R7
10kI
R8
49.9kI
ADAPTER
CURRENT-LIMIT
FLAG
LDO
Figure 1. Standard Application Circuit
Detailed Description
The MAX17435/MAX17535 charger includes all the
functions necessary to charge Li+, NiMH, and NiCd smart
batteries. A high-efficiency synchronous rectified step-
down DC-DC converter is used to implement a constant-
current constant-voltage charger. The DC-DC converter
drives a high-side n-channel MOSFET and provides
synchronous rectification with a low-side n-channel
MOSFET. The charge current and input current-sense
amplifiers have low-input offset errors (200FV typ),
allowing the use of small-valued sense resistors. The
MAX17435/MAX17535 use an SMBus interface similar
to the MAX8731A to set charge current, charge voltage,
and input current limit. In addition, the MAX17435/
MAX17535 SMBus interface supports ChargeVoltage
(), ChargeCurrent(), InputCurrent(), RELEARN(), and
IINPVoltage() readback.
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