MIC2182YM Micrel Inc, MIC2182YM Datasheet - Page 3

• Manufacturer Part Number: MIC2182YM
• Description: IC,SMPS CONTROLLER,CURRENT-MODE,BICMOS,SOP,16PIN,PLASTIC
• Manufacturer: Micrel Inc
• Type: Step-Down (Buck)r

Specifications of MIC2182YM

• Rohs Compliant: YES
• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 6 V
• Current - Output: 20A
• Frequency - Switching: 300kHz
• Voltage - Input: 4.5 ~ 32 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Power - Output: 400mW
• Number Of Pwm Outputs: 1
• On/off Pin: Yes
• Adjustable Output: Yes
• Topology: Boost/Buck
• Switching Freq: 330KHz
• Operating Supply Voltage (max): 32V
• Output Current: 20mA
• Output Voltage: 1.25 to 6V
• Synchronous Pin: Yes
• Rise Time: 60ns
• Fall Time: 60ns
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 16
• Package Type: SOP N
• Duty Cycle: 86%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1068

Pin Description
April 22, 2004
MIC2182
Pin Number
7 (fixed)
7 (adj)
10
11
12
13
14
15
16
1
2
3
4
5
6
8
9
Pin Name
EN/UVLO
COMP
SGND
PGND
SYNC
VOUT
VREF
PWM
VSW
CSH
VDD
HSD
LSD
BST
VIN
SS
FB
Pin Function
Soft-Start (External Component): Connect external capacitor to ground to
reduce inrush current by delaying and slowing the output voltage rise time.
Rise time is controlled by an internal 5 A current source that charges an
external capacitor to V
PWM/Skip-Mode Select (Input): Low sets PWM-mode operation. 1nF
capacitor to ground sets automatic PWM/skip-mode selection.
Compensation (Output): Internal error amplifier output. Connect to capacitor
or series RC network to compensate the regulator control loop.
Small Signal Ground (Return): Route separately from other ground traces to
the (–) terminal of C
Frequency Synchronization (Input): Optional. Connect to external clock
signal to synchronize the oscillator. Leading edge of signal above the
threshold terminates the switching cycle. Connect to SGND if unused.
Enable/Undervoltage Lockout (Input): Low-level signal powers down the
controller. Input below the 2.5V threshold disables switching and functions
as an accurate undervoltage lockout (UVLO). Input below the threshold
forces complete micropower (< 0.1 A) shutdown.
Reference Voltage (Output): 1.245V output. Requires 0.1 f capacitor to
ground.
Feedback (Input): Regulates FB pin to 1.245V. See “Application Information”
for resistor divider calculations.
Current-Sense High (Input): Current-limit comparator noninverting input. A
built-in offset of 100mV between CSH and V
current-sense resistor set the current-limit threshold level. This is also the
positive input to the current sense amplifier.
Current-Sense Low (Input): Output voltage feedback input and inverting
input for the current limit comparator and the current sense amplifier.
[Battery] Unregulated Input (Input): +4.5V to +32V supply input.
5V Internal Linear-Regulator (Output): V
drive supply voltage and an internal supply bus for the IC. Bypass to SGND
with 4.7 F. V
MOSFET Driver Power Ground (Return): Connects to source of synchro-
nous MOSFET and the (–) terminal of C
Low-Side Drive (Output): High-current driver output for external synchronous
MOSFET. Voltage swing is between ground and V
Boost (Input): Provides drive voltage for the high-side MOSFET driver. The
drive voltage is higher than the input voltage by V
Switch (Return): High-side MOSFET driver return.
High-Side Drive (Output): High-current driver output for high-side MOSFET.
This node voltage swing is between ground and V
3
DD
can supply up to 5mA for external loads.
OUT
DD
.
.
IN
DD
is the external MOSFET gate
OUT
pins in conjunction with the
DD
IN
DD
+ 5V – V
minus a diode drop.
.
diode drop
M9999-042204
.
Micrel