TSM101AIDT STMicroelectronics, TSM101AIDT Datasheet - Page 11

• Manufacturer Part Number: TSM101AIDT
• Description: IC CONTROLLER VOLT & CUR 8 SOIC
• Manufacturer: STMicroelectronics

Specifications of TSM101AIDT

• Function: Charge Management
• Battery Type: All Battery Types
• Voltage - Supply: 4.5 V ~ 32 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Number Of Outputs: 1
• Output Current: 20 mA
• Input Voltage: 4.5 V to 32 V
• Supply Current: 2 mA
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2331-2

The current control is given by the choice of the
voltage drop through the sense resistor R5 (to be
linked to the nominal current of the application)
and by the value of the sense resistor itself.
For medium currents (< 1A), a good value for the
voltage drop through R5 can be Vsense = 200mV
(dissipation < 200mW).
The resistor bridge R2/R3 should be chosen fol-
lowing equation 2 :
The total value of the resistor bridge should be in
the range of the kW in order to ensure a proper
charge for the voltage reference (in the range of
the mA).
To set the current limit, the sense resistor R5
should be chosen following equation 3 :
The internal current generator (Isce) can be used
to offset the current limitation with a lower value.
This current generator is activated by connecting
pin 2 to ground. It is inhibited if pin 2 is connected
to the positive rail via the pull up resistor R1.
The current offset is given by the choice of the re-
sistor R4.
If Ilim1 is the current limit calculated in the previ-
ous paragraph, and Ilim2 is the current limit that is
to be set when pin 2 is connected to ground, R4
should be chosen following equation 4 :
where Isce = 1.4mA
C4 and C5 are bypass capacitors used to smooth-
en the regulated outputs.
C2 and C3 are capacitors used for high frequency
compensation.
EXAMPLES OF COMPONENT LISTS
Table 1 summerizes a few examples of compo-
nent lists to generate quickly 15V/700mA/200mA,
12V/1A/500mA or 8.2V/200mA/100mA voltage
and current regulations.
Vsense = R3/(R2+R3)xVref
Ilim = Vsense/R5
R4 = (Vsense - Ilim2xR5)/Isce
eq2
eq3
eq4
Figure 2
R1
R2
R3
R4
R5
R6
R7
P1
2 straps
C2
C3
C4
C5
Voltage/
Current
Control
1.2
700mA
200mA
220k
100nF
100nF
100nF
1.2k
10k
100
12k
100
10 F
15V
1k
0
x 4
0.8
500mA
220k
100nF
100nF
100nF
1.2k
8.2k
10k
100
22 F
68
12V
1k
0
1A
x 4
TSM101/A
200mA
100mA
220k
1
100nF
100nF
100nF
1.2k
5.6k
4.7 F
10k
100
8.2V
68
1k
0
x 1
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