MC33341DG ON Semiconductor, MC33341DG Datasheet - Page 7

• Manufacturer Part Number: MC33341DG
• Description: IC CTRLR BATTERY PS REG 8-SOIC
• Manufacturer: ON Semiconductor

Specifications of MC33341DG

• Function: Charge Management
• Battery Type: All Battery Types
• Voltage - Supply: 2.3 V ~ 16 V
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Output Current: 50 mA
• Operating Supply Voltage: 2.3 V to 15 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pin 8 to ground. This configuration is shown for ease of
understanding and would normally be used to provide an
isolated control signal to a primary side switching regulator
controller. In non−isolated, primary or secondary side
applications, a load resistor can be placed from Pin 8 to
ground. This resistor will convert the Drive Output current
to a voltage for direct control of a regulator.
possible from the source or load, the load induced voltage
The above figure shows the MC33341 configured for source high−side current sensing allowing a common ground path between Load − and
Source Return −. The Differential Amplifier inputs, Pins 1 and 6, are used to sense the load induced voltage drop that appears across resistor
R
is required in applications where a high peak level of reverse current is possible if the source inputs are shorted. The resistor value should
be chosen to limit the input current of the internal V
current sensing accuracy.
In applications where excessively high peak currents are
S
. The internal voltage and current regulation thresholds are selected by the respective external connections of Pins 2 and 6. Resistor R3
Source
Source
Return
Isolator
Opto
V reg + V
+ 1.2 R2
th(V)
R1
R2
R1
) 1
) 1
Figure 14. Source High−Side Current Sensing with
1.2 V
Internally Fixed Voltage and Current Thresholds
8
1
R
R
R
Differential Amp
Disable Logic
Differential Amp
Inverting Amp
R
CC
R
R
clamp diode to less than 20 mA. Excessively large values for R3 will degrade the
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V
V
0.4 V
CC
7
2
CC
MC33341
I reg +
V
V
CC
CC
7
+ 0.2
1.2 V
R
S
V
V
R
I
V
sen
sen
drop across R
current sensing configuration used, this will result in
forward biasing of either the internal V
Pin 6, or the device substrate, Pin 1. Under these conditions,
input series resistor R3 is required. The peak input current
should be limited to 20 mA. Excessively large values for R3
will degrade the current sensing accuracy. Figure 22 shows
a method of bounding the voltage drop across R
sacrificing current sensing accuracy.
th(I HS)
I
S
th
th
0.2 V
R
V
S
CC
V
I
6
3
Transconductance
R3
V
V
Comp
CC
CC
0.2 V 0.4 V 1.2 V
Amp
Reference
S
V
CC
could exceed 1.6 V. Depending upon the
V
CC
5
4
R2
R3 +
I
pk
R1
R
0.02
S
– 0.6
Load
Load
CC
clamp diode,
S
Battery or
Resistive
Load
without