Datasheet
Integrated Charger, Dual Main Step-Down
Controllers, and Dual LDO Regulators
MAX17085B
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, no load on LDO5, LDO3, OUT5, OUT3, and REF, V
CC
= 5V, ON3 = ON5 = V
CC
, V
DCIN
= V
LXC
= V
CSSP
= V
CSSN
= 19V, V
BSTC
- V
LXC
= 5V, V
BATT
= V
CSIP
= V
CSIN
= 12.6V, V
VCTL
= V
ISET
= 1.8V, CELLS = open, T
A
= 0°C to +85°C, unless oth-
erwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAIN SMPS INPUTS AND OUTPUTS
SKIP Threshold Voltage V
SKIP
High = SKIP 2.3 V
CC
V
Mid = PWM 1.5 1.9
Low = ultrasonic 0 0.8
SKIP Leakage Current
V
SKIP
= 0 or 5V, T
A
= +25°C
-2 +2
FA
ON_ Input Logic Levels
High (SMPS on) 2.4
V
Low (SMPS off) 0.8
ON_ Leakage Current
V
ON3
= V
ON5
= 0 or 5V, T
A
= +25°C
-2 +2
FA
OUT_ Discharge-Mode
On-Resistance
R
DSCHG
ON_ = GND 7.5 20 50
I
SMPS GATE DRIVERS
DH3, DH5 Gate Driver
On-Resistance
R
DH3
, R
DH5
BST3 - LX3 and BST5 - LX5 forced to 5V;
high state
1.6 3.8
I
BST3 - LX3 and BST5 - LX5 forced to 5V; low
state
1.6 3.8
DL3, DL5 Gate Driver
On-Resistance
R
DL3
, R
DL5
DL3, DL5; high state 1.5 3.5
I
DL3, DL5; low state 0.6 1.5
DH3, DH5 Gate Driver Source/
Sink Current
I
DH
DH3, DH5 forced to 2.5V,
BST3 - LX3 and BST5 - LX5 forced to 5V
2 A
DL3, DL5 Gate Driver
Source Current
I
DL(SOURCE)
DL3, DL5 forced to 2.5V 1.7 A
DL3, DL5 Gate Driver
Sink Current
I
DL(SINK)
DL3, DL5 forced to 2.5V 3.3 A
DHC Gate Driver On-
Resistance
R
DHC
High state, I
DHC
= 10mA 1.5 3
I
Low state, I
DHC
= -10mA 0.8 2.1
DLC Gate Driver
On-Resistance
R
DLC
High state, I
DLC
= 10mA 3 6
I
Low state, I
DLC
= -10mA 3 6
Internal BST_ Switch
On-Resistance
R
BST
I
BST
_ = 10mA, V
DD
= 5V 5
I
BST_ Leakage Current I
BST
V
BST
_ = 24V, OUT3 and OUT5 above
regulation threshold, T
A
= +25°C
2 20
FA
CHARGER SMPS
DHC Off-Time K Factor V
DCIN
= 19V, V
BATT
= 10V 30 35 40 ns/V
Sense Voltage for Minimum
Discontinuous Mode Ripple
Current
V
CSIP
- V
CSIN
5 mV
Zero Crossing Comparator
Threshold
V
CSIP
- V
CSIN
10 mV
Cycle-by-Cycle Current- Limit
Sense Voltage
V
CSIP
- V
CSIN
120 125 130 mV