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MAX712CPE Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # MAX712CPE
Description  NiCd/NiMH Battery Fast-Charge Controllers
Download  18 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX712CPE Datasheet(HTML) 10 Page - Maxim Integrated Products

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NiCd/NiMH Battery
Fast-Charge Controllers
10
______________________________________________________________________________________
The 1.5V of overhead is needed to allow for worst-case
voltage drops across the pass transistor (Q1 of
Typical
Operating Circuit), the diode (D1), and the sense
resistor (RSENSE). This minimum input voltage require-
ment is critical, because violating it can inhibit proper
termination of the fast-charge cycle. A safe rule of
thumb is to choose a source that has a minimum input
voltage = 1.5V + (1.9V x the maximum number of cells
to be charged). When the input voltage at DC IN drops
below the 1.5V + (1.9V x number of cells), the part
oscillates between fast charge and trickle charge and
might never completely terminate fast-charge.
The MAX712/MAX713 are inactive without the wall cube
attached, drawing 5
µA (max) from the battery. Diode D1
prevents current conduction into the DRV pin. When the
wall cube is connected, it charges C1 through R1 (see
Typical Operating Circuit) or the current-limiting diode
(Figure 19). Once C1 charges to 5V, the internal shunt
regulator sinks current to regulate V+ to 5V, and fast
charge commences. The MAX712/MAX713 fast charge
until one of the three fast-charge terminating conditions
is triggered.
If DC IN exceeds 20V, add a cascode connection in
series with the DRV pin as shown in Figure 5 to prevent
exceeding DRV’s absolute maximum ratings.
Furthermore, if Figure 19’s DC IN exceeds 15V, a tran-
sistor level-shifter is needed to provide the proper volt-
age swing to the MOSFET gate. See the MAX713 EV kit
manual for details.
Select the current-limiting component (R1 or D4) to
pass at least 5mA at the minimum DC IN voltage (see
step 6 in the
Getting Started section). The maximum
current into V+ determines power dissipation in the
MAX712/MAX713.
maximum current into V+ =
(maximum DC IN voltage - 5V) / R1
power dissipation due to shunt regulator =
5V x (maximum current into V+)
Sink current into the DRV pin also causes power dissipa-
tion. Do not allow the total power dissipation to exceed
the specifications shown in the
Absolute Maximum
Ratings.
Fast Charge
The MAX712/MAX713 enter the fast-charge state under
one of the following conditions:
1) Upon application of power (batteries already
installed), with battery current detection (i.e., GND
voltage is less than BATT- voltage), and TEMP
higher than TLO and less than THI and cell voltage
higher than the UVLO voltage.
2) Upon insertion of a battery, with TEMP higher than
TLO and lower than THI and cell voltage higher than
the UVLO voltage.
RSENSE sets the fast-charge current into the battery. In
fast charge, the voltage difference between the BATT-
and GND pins is regulated to 250mV. DRV current
increases its sink current if this voltage difference falls
below 250mV, and decreases its sink current if the volt-
age difference exceeds 250mV.
fast-charge current (IFAST) = 0.25V / RSENSE
Trickle Charge
Selecting a fast-charge current (IFAST) of C/2, C, 2C, or
4C ensures a C/16 trickle-charge current. Other fast-
charge rates can be used, but the trickle-charge
current will not be exactly C/16.
BATT-
X
V+
OPEN
REF
BATT-
1
0
0
0
0
8
512
256
128
64
CURRENT-SENSE AMPLIFIER
PGM3 FAST_CHARGE Av
1.25V
V+
DC IN
GND
DRV
GND
CC
BATT-
RSENSE
D1
REF
VLIMIT
CELL_VOLTAGE
BATT-
BATT-
IN_REGULATION
C2
Figure 6. Current and Voltage Regulator (linear mode)


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