MAX17085BETL+T Maxim Integrated Products, MAX17085BETL+T Datasheet - Page 18

• Manufacturer Part Number: MAX17085BETL+T
• Description: Battery Management Dual Main Step-Down Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX17085BETL+T

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Integrated Charger, Dual Main Step-Down
Controllers, and Dual LDO Regulators
The MAX17085B standard application circuit (Figure 1)
features a 4A charger, 8A outputs on SMPS5 and
Table 1. Component Selection for Standard Applications
18
Input Voltage
Input Capacitor
Output Capacitor
Inductor
High-Side MOSFET
Low-Side MOSFET
Current-Limit Setting
COMPONENT
_____________________________________________________________________________________
PIN
36
37
38
39
40
—
Standard Application Circuit
NAME
SKIP
TON
ON3
ON5
DH3
EP
V
(2) 10FF, 25V
Taiyo Yuden
TMK432BJ106KM
Murata GRM31CR61E106K
C
(1) 100FF, 6V, 18mI
SANYO 6TPE100MI
L3
1.5FH, 2.1mI, 11.8A
Sumida CEP125S-1R5
N
13A, 9.4mI/12mI, 30V
Fairchild FDS6298
N
13A, 7.2mI/10mI, 30V
Fairchild FDS6670A
0.45V (45mV limit)
R
R
SMPS3: 3.3V, 8A, 500kHZ
SYS
ILIM3A
ILIM3B
OUT3
H3
L3
Pulse-Skipping Control Input. This tri-level input determines the operating mode for the switching
regulators.
High (V
Mid (1.8V) = forced-PWM operation
GND = ultrasonic mode
Switching Frequency Setting Input. An external resistor between the input power source and this pin
sets the nominal switching frequency according to the following equation:
where C
SMPS5 has a switching frequency that is 10% higher than nominal, and SMPS3 has a switching
frequency 10% lower than nominal.
R
Enable Input for SMPS3. Drive ON3 high to enable SMPS3. Drive ON3 low to shut down SMPS3.
Enable Input for SMPS5. Drive ON5 high to enable SMPS5. Drive ON5 low to shut down SMPS5.
High-Side Gate-Driver Output for SMPS3. DH3 swings from LX3 to BST3.
Exposed Pad. Internally connected to power ground (PGND). Connect the backside exposed pad to
the system power ground as well.
TON
= 7V to 24V
= 66.5kI
= 82.5kI
is high impedance when ON3 = ON5 = GND.
CC
TON
) = pulse-skipping mode
= 6pF.
V
(2) 10FF, 25V
Taiyo Yuden TMK432BJ106KM
Murata GRM31CR61E106K
C
(1) 100FF, 6V, 18mI
SANYO 6TPE100MI
L5
1.5FH, 2.1mI, 11.8A
Sumida CEP125S-1R5
N
13A, 9.4mI/12mI, 30V
Fairchild FDS6298
N
13A, 7.2mI/10mI, 30V
Fairchild FDS6670A
0.45V (45mV limit)
R
R
SYS
ILIM5A
ILIM5B
OUT5
H5
L5
f
SMPS5: 5V, 8A, 600kHZ
SW(NOM)
= 7V to 24V
= 66.5kI
= 82.5kI
SMPS3, and a 100mA LDO5 and 50mA LDO3 typical
of most notebook CPU applications. See Table 1 for
component selections. Table 2 lists the component
suppliers.
= 1/(C
FUNCTION
TON
x (R
Pin Description (continued)
TON
+ 6.5kI))
V
(2) 4.7FF, 25V
Taiyo Yuden TMK432BJ475KM
Murata GRM31CR71E475M
C
(1) 4.7FF, 25V
Taiyo Yuden TMK432BJ475KM
Murata GRM31CR71E475M
L
2FH, 19mI, 4.5A
Sumida CDR7D28MN-2R0
N
6.6A, 17mI/25mI, 30V
International Rectifier IRF7807D1PBF
N
6.6A, 17mI/25mI, 30V
International Rectifier IRF7807D1PBF
—
CHG
ADP
OUT(CHG)
HC
LC
CHARGER, 16.8V, 4A, 1.2MHZ
= 18V to 20V