MIC2184YM TR Micrel Inc, MIC2184YM TR Datasheet - Page 3

• Manufacturer Part Number: MIC2184YM TR
• Description: SO-16 Low Vin Buck PWM Control IC ( )
• Manufacturer: Micrel Inc

Specifications of MIC2184YM TR

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 440kHz
• Duty Cycle: 100%
• Voltage - Supply: 2.9 V ~ 14 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SOIC (3.9mm Width)
• Frequency-max: 440kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MIC2184YMTR; MIC2184YMTR

Pin Description
April 2005
MIC2184
Pin Number
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
Pin Name
EN/UVLO
FreqOut
FREQ/2
COMP
SGND
PGND
SYNC
OUTP
VREF
VINA
VINP
CSH
VDD
CSL
SS
FB
Pin Function
Analog voltage input voltage to the circuit. This powers up the analog
sections of the die and does not need to be the same voltage as Pin 16
(V
This provides a digital signal output signal at half the switching frequency.
This signal swings from 0 to 3V, and can be used to drive an external
capacitive doubler to provide a higher voltage to the V
Soft start reduces the inrush current and delays and slows the output voltage
rise time. A 5µA current source will charge the capacitor up to V
capacitor will soft start the switching regulator in 1.5ms.
Compensation (Output): Internal error amplifier output. Connect to a
capacitor or series RC network to compensate the regulator’s control loop.
Small signal ground: must be routed separately from other grounds to the (-)
terminal of C
Feedback Input - the circuit regulates this pin to 1.245V.
Enable/UnderVoltage Lockout (input): A low level on this pin will power down
the device, reducing the quiescent current to under 5uA. This pin has two
separate thresholds, below 1.5V the output switching is disabled, and below
0.9V the part is forced into a complete micropower shutdown. The 1.5V
threshold functions as an accurate undervoltage lockout (UVLO) with 140mV
hysteresis.
The (-) input to the current limit comparator. A built in offset of 100mV
between CSH and CSL in conjunction with the current sense resistor sets
the current limit threshold level. This is also the (-) input to the current
amplifier.
The (+) input to the current limit comparator. A built in offset of 100mV
between CSH and CSL in conjunction with the current sense resistor sets
the current limit threshold level. This is also the (+) input to the current
amplifier.
3V internal linear-regulator output. V
chip. Bypass to SGND with 1µF.
Frequency Synchronization (Input): Connect an external clock signal to
synchronize the oscillator. Leading edge of signal above 1.5V starts the
switching cycle. Connect to SGND if not used.
MOSFET driver power ground, connects to source of synchronous MOSFET
and the (-) terminal of CIN.
The 1.245V voltage reference is available on this pin. A 0.1µF capacitor
should be connected from this pin to ground.
High current drive for high side P channel MOSFET. Voltage swing is from
ground to V
When this is low, the oscillator frequency is 400KHz. When this pin is raised
to V
Power Input voltage to the circuit. The output gate drivers are powered from
this supply. The current sense resistor R
possible to this pin.
IN
P).
DD
, the oscillator frequency is 200KHz.
3
IN
OUT
P. On-resistance is typically 2.5Ω.
.
DD
is also the supply voltage bus for the
CS
should be connected as close as
IN
P input.
DD
M9999-042205
. A 1µF
Micrel, Inc.