Datasheet

Integrated Charger, Dual Main Step-Down
Controllers, and Dual LDO Regulators
MAX17085B
______________________________________________________________________________________ 13
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
ADP
= V
SYS
= 20V, V
BATT
= 16.8V, V
LDO5
= V
CC
= 5V, V
LDO3
= 3.3V, T
A
= +25°C, unless otherwise noted.)
BATTERY REMOVAL (V
BATT
= 11V)
MAX17085B toc10
CC
1V/div
V
BATT
5V/div
DCIN
5V/div
IL
CHG
2A/div
1.5V
11V
19V
0A
100µs/div
3-CELL BATTERY
SYSTEM LOAD TRANSIENT
(0A 3A 0A )
MAX17085B toc11
CC
1V/div
V
BATT
2V/div
I
SYSLD
2A/div
IL
CHG
2A/div
1.5V
12.6V
0A
0A
400µs/div
19V ADAPTER INPUT
3-CELL BATTERY, 3A CHARGING CURRENT
CHARGER OUTPUT SHORT CIRCUIT
MAX17085B toc12
V
BATT
5V/div
IL
CHG
2A/div
0V
0A
20µs/div
3-CELL BATTERY
POWER-SOURCE SELECTOR SCHEME
WHEN BATTERY IS PRESENT
(ADAPTER REMOVAL)
MAX17085B toc13
PDSL
20V/div
V
BATT
5V/div
V
SYSLD
10V/div
V
ADAPTER
10V/div
0V
20V
12.6V
20V
10ms/div
20V ADAPTER INPUT, 3-CELL BATTERY
POWER-SOURCE SELECTOR SCHEME
WHEN BATTERY IS PRESENT
(ADAPTER INSERTION)
MAX17085B toc14
PDSL
20V/div
V
BATT
5V/div
V
SYSLD
10V/div
V
ADAPTER
10V/div
0V
0V
12.6V
12.6V
10ms/div
20V ADAPTER INPUT, 3-CELL BATTERY
V
REF
LINE REGULATION
(SWITCHING AND NOT SWITCHING)
MAX17085B toc15
INPUT VOLTAGE (V)
REF VOLTAGE (V)
242016128
2.092
2.094
2.096
2.098
2.100
2.090
42
8
CHARGER AND SMPSs ARE ALL ON WHEN
SWITCHING, ALL OFF WHEN NOT SWITCHING
NOT SWITCHING
SWITCHING
V
REF
vs. AMBIENT TEMPERATURE
MAX17085B toc16
AMBIENT TEMPERATURE (°C)
REF VOLTAGE (V)
706010 20 30 40 50
2.096
2.098
2.100
2.102
2.104
2.106
2.108
2.110
2.094
08
0
CHARGER EFFICIENCY
vs. CHARGING CURRENT
MAX17085B toc17
CHARGING CURRENT (A)
EFFICIENCY (%)
761 2 3 4 5
84
86
88
90
92
94
96
98
82
08
V
ADAPTER
= 20V
4A INPUT CURRENT LIMIT
2-CELL
3-CELL
4-CELL
LDO5 LOAD REGULATION
MAX17085B toc18
LOAD CURRENT (mA)
LDO5 VOLTAGE (V)
12010080604020
4.85
4.90
4.95
5.00
5.05
5.10
4.80
0 140
V
ADAPTER
= 19V
CHARGER OFF
SMPS5 AND SMPS3 OFF
LDO3 NO LOAD