MIC2185YM Micrel Inc, MIC2185YM Datasheet

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MIC2185YM

Manufacturer Part Number
MIC2185YM
Description
SO-16 Low Vin Synchronous Buck PWM Control IC ( )
Manufacturer
Micrel Inc
Datasheet

Specifications of MIC2185YM

Duty Cycle
95%
Lead Free Status
Lead free
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
440kHz
Voltage - Supply
2.9 V ~ 14 V
Buck
No
Boost
Yes
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
Number Of Pwm Outputs
1
On/off Pin
Yes
Adjustable Output
Yes
Topology
Boost/Buck
Switching Freq
400KHz
Operating Supply Voltage (max)
14V
Synchronous Pin
Yes
Rise Time
50ns
Fall Time
50ns
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
16
Package Type
SOIC
Lead Free Status / RoHS Status
Compliant
Other names
576-1714-5
MIC2185YM

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MIC2185YM
Manufacturer:
MICREL
Quantity:
400
Part Number:
MIC2185YM
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
General Description
Micrel’s MIC2185 is a high efficiency synchronous boost
PWM control IC. With its wide input voltage range of 2.9V to
14V, the MIC2185 can be used to efficiently boost voltages
in 1- or 2-cell Li Ion battery powered applications, as well as
fixed 3.3V and 5V systems. Its powerful 5Ω output drivers
allow the MIC2185 to supply large output currents with the
selection of the proper external MOSFETs.
With it’s fixed frequency PWM architecture, and easily
synchronized drive, the MIC2185 is ideal for noise-sensi-
tive telecommunications applications. The nominal 400kHz
operating frequency of the MIC2185 can be divided by two,
allowing the device to be externally synchronized to frequen-
cies below 400kHz.
The MIC2185 also features a low current shutdown mode
and a programmable undervoltage lockout. A skipped pulse
mode of operation can be manually set to achieve higher
efficiencies at light load conditions.
The MIC2185 is available in a 16 pin SOIC package and 16
pin QSOP package with an ambient temperature operating
range from –40°C to 85°C.
Typical Application
October 2005
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
V
IN
= 3.3V
C
IN
15
10
11
1
7
4
8
2
VINA
EN/UVLO
FREQ/2
VDD
COMP
VREF
SYNC
SKIP
SS
MIC2185
Ordering Information
3
2.4µH
Standard
MIC2185BM
MIC2185BQS
Adjustable Output Synchronous Boost Converter
SGND
5
OUTN
PGND
OUTP
VINP
CSH
Part Number
FB
14
16
6
13
9
12
Pb-Free
MIC2185YM
MIC2185YQS
Si4884DY (x2)
8m
Si9803DY (x2)
1
Features
• Input voltage range: 2.9V to 14V
• 95% efficiency
• Oscillator frequency of 200kHz/400kHz
• Frequency sync to 600kHz
• 0.5µA shutdown current
• Two 5Ω output drivers
• Front edge blanking
• PWM current mode control
• Cycle-by-cycle current limiting
• Frequency foldback protection
• Adjustable under-voltage lockout
• Precision 1.245V reference output
• 16 pin SOIC narrow body package
Applications
• 3.3V to 5V conversion in telecom systems
• Satellite phones
• Cable modems
• 1-and 2-cell Li Ion battery operated equipment
Low Voltage Synchronous Boost PWM Control IC
200/400kHz
200/400kHz
Frequency
C
OUT
V
OUT
Voltage
= 5V
Adj
Adj
MIC2185
100
95
90
85
80
75
70
0
–40ºC to +125ºC
–40ºC to +125ºC
Temp. Range
5V Output Efficienc y
OUTPUT CURRENT (A)
1
Junction
2
V
200kHz P WM
IN
3
= 3.3V
4
16-pin QSOP
16-pin SOIC
Package
5
MIC2185

Related parts for MIC2185YM

MIC2185YM Summary of contents

Page 1

... Precision 1.245V reference output • 16 pin SOIC narrow body package Applications • 3. conversion in telecom systems • Satellite phones • Cable modems • 1-and 2-cell Li Ion battery operated equipment Part Number Frequency Pb-Free MIC2185YM 200/400kHz MIC2185YQS 200/400kHz Si9803DY (x2) 14 OUTP 16 VINP 6 ...

Page 2

Pin Configuration Pin Description Pin Number Pin Name 1 VINA 2 SKIP 3 4 COMP 5 SGND 6 7 EN/UVLO 8 VREF 9 CSH 10 VDD 11 SYNC 12 PGND 13 OUTN 14 OUTP 15 FREQ/2 16 VINP MIC2185 VINA ...

Page 3

Absolute Maximum Ratings (Note 1) Supply Voltage ( .......................................... 15V IN IN Digital Supply Voltage (V ) ............................................ 7V DD Skip Pin Voltage (V ) ....................................–0. SKIP Comp Pin Voltage (V ) ...............................–0. ...

Page 4

Parameter Condition Soft Start Soft Start Current Current Limit Current Limit Threshold Voltage Voltage on CSH to trip current limit Error Amplifier Error Amplifier Gain Current Amplifier Current Amplifier Gain SKIP Input SKIP Threshold SKIP Input Current V SKIP Oscillator ...

Page 5

Typical Characteristics Quiescent Current vs. Temperature (SKIP Mode) 0.8 0.7 0.6 0.5 0 12V 0 QVINA QVINP 0 -40 - ...

Page 6

Oscillator Frequency vs. Input Voltage 422 12V 421 IN DC 420 419 418 417 416 415 414 413 412 INPUT VOLTAGE (V ) INA MIC2185 Oscillator Frequency vs. Temperature ...

Page 7

Functional Diagram V IN EN/UVLO 7 SKIP 2 fs/4 FREQ/2 15 SYNC Osc 11 Correction Ramp SS 3 COMP 4 VREF V REF 8 VDD V 10 Functional Description The MIC2185 is a BiCMOS, switched mode, synchronous boost (step up) ...

Page 8

MOSFET, Q2. Current flows through the MOSFET because its voltage drop is less than diode D1. The MOSFET remains on until the end of the switching cycle. There is another non-overlap time delay between the turn-off of the high side ...

Page 9

Pulling the SKIP pin (pin 2) low will force the controller to operate in PWM mode for all load conditions. Pulling the SKIP pin high will force ...

Page 10

PWM Operation PWM ModeWaveform OUT Switch NodeVoltage (Low Side FE T Drain) 5V/div High Side FET Gate Drive 5V/div Low Side FET Gate Drive 5V/div Inductor Current 1A offset; 0.5A/ RippleVoltage ...

Page 11

V × − R × WINDING V × η IN where the winding resistance of the inductor WINDING R is the on resistance of the low side switching DS(ON) ...

Page 12

Reference, Enable and UVLO Circuits The output drivers are enabled when the following conditions are satisfied: • The VDD voltage (pin 10) is greater than its undervoltage threshold. • The voltage on the Enable pin is greater than the Enable ...

Page 13

Soft Start Soft Start reduces the power supply input surge current at start up by limiting the output voltage rise time. Input surge current occurs when the boost converter charges up the output capacitance. Slowing the output rise time lowers ...

Page 14

Use a ferrite material for the inductor core, which has less core loss than an MPP or iron power core. The significant contributors to power loss at higher output loads are (in approximate order of magnitude): • Resistive on-time ...

Page 15

... SEATING 0.0688 (1.748) PLANE 0.0532 (1.351) MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signifi ...

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