MIC2199 データシートの表示（PDF） - Micrel

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MIC2199

300kHz 4mm × 4mm Synchronous Buck Converter

Micrel 

Micrel, Inc.

Ordering Information

Part Number

Standard

Pb-Free

MIC2199BML MIC2199YML

Voltage

Adj

Temperature Range

Package

−40ºC to +125ºC 12-Pin 4x4 MLF®

MIC2199.

Pin Configuration

COMP 1

EN/UVLO 2

FB 3

CSH 4

VOUT 5

VIN 6

12 HSD

11 VSW

10 BST

9 GND

8 LSD

7 VDD

12-Pin 4×4 MLF® (ML)

Pin Description

Pin Number

1

2

Pin Name

COMP

EN/UVLO

3

FB

4

CSH

5

VOUT

6

VIN

7

VDD

8

LSD

9

GND

10

BST

11

VSW

12

HSD

Pin Function

Compensation (Output):  Internal error amplifier output. Connect to capacitor

or series RC network to compensate the regulator control loop.

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 (<0.1µA) shutdown.

Feedback (Input):  Regulates FB pin to 0.8V. See “Applications Information”

for resistor divider calculations.

Current-Sense High (Input):  Current limit comparator non-inverting input. A

built-in offset of 100mV between CSH and VOUT pins in conjunction with the

current-sense resistor set the current limit threshold level. This is also the

non-inverting 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.

Unregulated Input (Input):  +4.5V to +32V supply input.

5V Internal Linear-Regulator (Output):  VDD is the external MOSFET gate

drive supply voltage and internal supply bus for the IC. Bypass to GND with

4.7µF.

Low-Side Drive (Output):  High-current driver output for low-side N-Channel

MOSFET. Voltage swing is between ground and VDD.

Ground (Return).

Boost (Input):  Provides drive voltage for the high-side MOSFET driver. The

drive voltage is higher than the input voltage by VDD minus a diode drop.

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 VIN +5V minus a diode drop.

January 2010

2

M9999-011310

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