MAX17435ETG+T Maxim Integrated Products, MAX17435ETG+T Datasheet - Page 14

• Manufacturer Part Number: MAX17435ETG+T
• Description: IC SMBUS BATT CHARGER 24TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX17435ETG+T

• Function: Charge Management
• Battery Type: Multi-Chemistry
• Voltage - Supply: 8 V ~ 26 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Frequency,
Low-Cost SMBus Chargers
Figure 1. Standard Application Circuit
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
14
_____________________________________________________________________________________
ADAPTER
CONTROL
SMBus
10kI
2MI
GND
R13
R11
N4
ACOK
LDO
Detailed Description
N3
103kI
10kI
10I
R10
R14
10kI
R16
R9
10kI
C10
1FF
1FF
1FF
C11
1FF
C1
C3
R5
150kI
R4
10I
R17
ACIN
ACOK
LDO
V
GND
V
SCL
SDA
AA
CC
DCIN
Q1A
PDSL
10nF
C6
MAX17435
MAX17535
CSSP
LDO
EN
R12
10kI
10mI
RS1
1kI
R18
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.
CSSN
PGND PAD
ADAPTLIM
CSIN
BATT
CSIP
ITHR
DLO
IINP
BST
DHI
CC
LX
C4
0.1FF
C5
0.01FF
C2
0.1FF
N1
7.06kI
N2
R6
LDO
SYSTEM LOAD
RS2
10mI
R7
10kI
C
L1
C
IN
49.9kI
OUT
IINP VOLTAGE
R8
C
C
L1 = 2FH
IN
OUT
= 2 x 4.7FF
= 4.7FF
LDO
BATTERY
Q1B
ADAPTER
CURRENT-LIMIT
FLAG