Fujitsu MB3842 - Manual
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Table of Contents:
- Page 2 – PIN ASSIGNMENT
- Page 3 – PIN DESCRIPTION; Symbol
- Page 7 – DIAGRAM; • Normal operation; • At V; fall
- Page 8 – • At overcurrent detection; • At over-temperature occurrence
- Page 9 – TYPICAL CHARACTERISTICS; vs. limit current characteristics
- Page 11 – Measurement circuit; Temperature protection; Overcurrent flag set; Unlimited; ) saturation characteristics; “Open”
- Page 12 – • Power derating characteristics; Power dissipation P
- Page 13 – FUNCTIONAL DESCRIPTION; voltage
- Page 14 – TYPICAL APPLICATION; Top View; Control signal
- Page 15 – APPLICATION EXAMPLE; *The MB3842 can also be adapted for use with 3.3V controllers.; and GND, or between OUT and GND as required.
- Page 17 – USAGE PRECAUTION; Never use settings exceeding maximum rated conditions.; to 1 M; Do not apply negative voltages.; Current cannot flow back to the V; ORDERING INFORMATION; Part number
- Page 18 – PACKAGE DIMENSION
- Page 19 – FUJITSU LIMITED; FUJITSU LIMITED Printed in Japan
DS04-27604-2E
FUJITSU SEMICONDUCTOR
DATA SHEET
ASSP For Power Supply Applications
Power Management 2-ch Switch IC
MB3842/MB3845
■
DESCRIPTION
The MB3842/3845 is a power management switch with built-in 2-channel low-on resistance (typ. 100m
Ω
) switch.
Output control is by means of a control signal, and the MB3842 is designed for high-active operation (output on
when EN is Hi), while the MB3845 is designed for low-active operation (output on when EN is low.)
To provide adaptability to a variety of operations, the MB3842/3845 features low input voltage (V
IN
>
2.5V)
operation and stable low-on resistance independent of input voltage. The switching current limit can be set from
100mA to 600mA by using external resistance, and when overcurrent conditions are detected the OC output goes
low to provide an external notification signal.
V
IN
is divided between the two channels, which operate independently of each other.
In addition, an off-state reverse current prevention function is provided to ensure accurate on/off switching action.
■
FEATURES
• Low on resistance switch (typ. 100m
Ω
)
• Low input voltage operation (2.5 V to 5.5 V)
• Switch current (max. 0.6 A)
• UVLO
:V
IN
threshold
2.3V/2.1 V hysteresis 200 mV
• ENABLE
:EN threshold
EN 1.4V/1.6 V for MB3842, EN 1/2 V
IN
for MB3845
:Power supply current at output off = 0
µ
A EN
<
0.8V for MB3842, EN
=
V
IN
for MB3845
• External setting for soft star t time and switch current limit.
• Over-temperature detection (switch latched off), over-current detection (not latched)
• OC pin flag set following overcurrent detection, over-temperature detection, or UVLO detection.
• Reverse current prevention at OFF (V
IN
≥
1.5 V)
• Either channel may be operated alone.
■
PACKAGE
20-pin plastic SSOP
(FPT-20P-M03)
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Summary
2 MB3842/MB3845 ■ PIN ASSIGNMENT 20 19 18 17 16 15 14 13 12 11 GND OC1 OUT1 OUT1 OUT1 OUT2 OUT2 OUT2 OC2 GND 1 2 3 4 5 6 7 8 9 10 EN1, EN1 SS1 CS1 VIN1 VIN1 VIN2 VIN2 CS2 SS2 EN2, EN2 SSOP-20P (FPT-20P-M03) EN Enable CS Current Set OC Over Current EN Enable SS Slow Start The functions of pin 1 and p...
3 MB3842/MB3845 ■ PIN DESCRIPTION Pin no. Symbol Descriptions 1/10 EN (MB3842) Control signal input pin.Set “H” to turn switch on, “L” to turn toff. At 0.8 V or less, the chip is in STBY state and current consumption is less than 1 µ A. “L” level is 1.4V (typ), “H” level is 1.6V (typ), with 200mV (t...
7 MB3842/MB3845 ■ DIAGRAM (Continued) VIN EN EN V OUT I OUT OC SW OFF Overcurrent does not occur SW ON SW ON 5 V Hi Low 5 V 5 V • Normal operation SW ON SW ON SW ON 2.3 V 2.1 V 5 V Hi Low 5 V 5 V = 0 V VIN EN EN V OUT I OUT OC Overcurrent does not occur • At V IN fall Note: The OC pin should be pull...
