Datasheet

13Maxim Integrated
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
MAX8900A/MAX8900B/MAX8900C
Pin Description
Pin Configuration
30 WLP
(0.4mm PITCH)
TOP VIEW (BUMPS DOWN)
+
A1
BAT
A2
CS
A3
LX
A4
PGND
A5
BST
A6
PVL
B1
BAT
B2
CS
B3
LX
B4
PGND
B5
PGND
B6
PGND
C1
STAT2
C2
CEN
C3
INBP
C4
INBP
C5
INBP
C6
INBP
D1
STAT1
D2
STAT3
D3
IN
D4
IN
D5
IN
D6
IN
E1
DNI
E2
SETI
E3
CT
E4
THM
E5
AVL
E6
GND
PIN NAME FUNCTION
A1, B1 BAT
Connection to Battery. Connect to a single-cell Li+/Li-Poly battery from BAT to PGND. Connect both
BAT pins together externally. Bypass BAT to PGND with a 2.2FF ceramic capacitor.
A2, B2 CS
40mI Current-Sense Node. Connect the inductor from LX to CS. Connect both CS pins together
externally.
A3, B3 LX
Inductor Switching Node. Connect the inductor between LX and CS. Connect both LX pins together
externally. When enabled (CEN = 0), LX switches between INBP and PGND to control the battery
charging. When disabled (CEN = 1), the LX switches are high-impedance however they still have
body diodes as shown in Figure 3.
A4, B4,
B5, B6
PGND
Power Ground for Step-Down Low-Side Synchronous n-Channel MOSFET. Connect all PGND pins
together externally.
A5 BST
Supply for High-Side n-Channel Gate Driver. Bypass BST to LX with a 0.1FF ceramic capacitor.
A6 PVL
5V Linear Regulator to Power Internal Circuits. PVL also charges the BST capacitor. Bypass PVL to
PGND with a 1.0FF ceramic capacitor. Powering external loads from PVL is not recommended.
C1 STAT2
Status Output 2. STAT2 is an open-drain output that has a 30V absolute maximum rating and a typical
pulldown resistance of 25I. For the MAX8900A, STAT1 and STAT2 indicate different states as shown
in Table 4. For the MAX8900B/MAX8900C, STAT1, STAT2, and STAT3 indicate different operating
states of the MAX8900_ as shown in Table 3.
C2
CEN
Charge Enable Input. CEN has an internal 200kI pulldown resistor. Pull CEN low or leave it
unconnected to enable the MAX8900_. Drive CEN high to disable the MAX8900_. Note: V
IN
must be
greater than V
UVLO-RISING
for the MAX8900_ to operate when CEN is pulled low. For example, if CEN
is low and the MAX8900_ is operating with V
UVLO-FALLING
< V
IN
< V
UVLO-RISING
, then toggling CEN
results in a nonoperating condition.