MAX1870AETJ+ Maxim Integrated Products, MAX1870AETJ+ Datasheet - Page 12

• Manufacturer Part Number: MAX1870AETJ+
• Description: Battery Management Li+ Step Up/Step Down Battery Charger
• Manufacturer: Maxim Integrated Products

Specifications of MAX1870AETJ+

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

Step-Up/Step-Down
Li+ Battery Charger
(Circuit of Figure 1, V
12
PIN
4, 8
10
11
______________________________________________________________________________________
1
2
3
5
6
7
9
V
V
BATT
NAME
REFIN
ASNS
SWITCHING WAVEFORM
IN
VCTL
GND
LDO
CCV
CCS
CLS
REF
CCI
= 12V
= 16V
DCIN
STEP-UP
2.00μs
= 16V, CELLS = REFIN, V
Device Power Supply. Output of the 5.4V linear regulator supplied from DCIN. Bypass LDO to GND with
a 1µF or greater ceramic capacitor.
4.096V Voltage Reference. Bypass REF to GND with a 1µF or greater ceramic capacitor.
Source Current-Limit Input. Voltage input for setting the current limit of the input source. See the Setting
the Input Current Limit section.
Analog Ground
Voltage Regulation Loop Compensation Point. Connect a 10kΩ resistor in series with a 0.01µF capacitor
to GND.
Charge-Current Regulation Loop Compensation Point. Connect a 0.01µF capacitor to GND.
Input-Current Regulation Loop Compensation Point. Connect a 0.01µF capacitor to GND.
Reference Input. ICTL and VCTL are ratiometric with respect to REFIN for increased accuracy.
Adapter Sense Output. Logic output is high when input current is greater than 1.5A (using 30mΩ sense
resistors and a 10kΩ resistor from IINP to GND).
Charge-Voltage Control Input. Drive VCTL from 0 to V
per cell. See the Setting the Charge Voltage section.
D3 ANODE
20V
10V
D4
0V
10V
0V
4A
2A
V
(AC-COUPLED)
50mV/div
BATT
INDUCTOR CURRENT
Typical Operating Characteristics (continued)
CATHODE
CLS =
V
REF
, V
ICTL
= V
REFIN
FUNCTION
V
V
BATT
= 3.3V, T
STEP-UP/STEP-DOWN
IN
= 16V
REFIN
= 16V
LIGHT LOAD
CHARGE CURRENT = 300mA
2.00μs
to adjust the charge voltage from 4V to 4.4V
A
= +25°C, unless otherwise noted.)
Pin Description
D3 ANODE
20V
10V
D4
0V
10V
0V
4A
2A
V
(AC-COUPLED)
50mV/div
BATT
INDUCTOR CURRENT
CATHODE