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MIC2186YQS-TR

P1-P3P4-P6P7-P9P10-P12P13-P15
April 2005 1 M9999-042205
MIC2186 Micrel, Inc.
MIC2186
Low Voltage PWM Control IC
General Description
Micrel’s MIC2186 is a high efficiency boost PWM control IC.
With its wide input voltage range of 2.9V to 14V, the MIC2186
can be used to efficiently boost voltages in 1- or 2-cell Li Ion
battery powered applications, as well as to boost voltages in
fixed 3.3V, 5V, or 12V systems. Its powerful 1.6Ω output
driver allows the MIC2186 to supply large output currents with
the selection of proper external MOSFETs.
The MIC2186 can be configured to operate at 100kHz,
200kHz, or 400kHz. With it’s fixed frequency PWM architec-
ture, and easily synchronized drive, the MIC2186 is ideal for
noise-sensitive telecommunications applications.
MIC2186 also features a low current shutdown mode of
0.5µA and programmable undervoltage lockout. A manually
selectable SKIP Mode allows high efficiencies in light load
situations.
The MIC2186 is available in 16 pin SOIC and QSOP package
options with an operating range from –40°C to 125°C.
Typical Application
VINA
Si4404DY
(x2)
4.5mΩ
2.2µH
MBR2535CT
C
IN
120µF
20V
C
OUT
150µF(x2)
20V
EN/UVLO
HIDC
FREQ/2
VDD
COMP
VREF
SKIP
SYNC
SS
MIC2186
SGND
VINP
FB
V
OUT
= 12
V
OUTN
CSH
V
IN
= 3.3V
PGND
3
12
9
14
6
16
7
5
11
2
8
4
10
15
13
1
60
65
70
75
80
85
90
95
00.511.522.53
EFFICIENCY (%)
OUTPUT CURRENT (A)
12V Out
p
ut Efficienc
y
V
IN
= 3.3V
Adjustable Output Boost Converter
Features
•Input voltage range: 2.9V to 14V
•1.6Ω output driver
• Oscillator frequency of 100kHz/200kHz/400kHz
•Frequency sync to 600kHz
•Front edge blanking
• PWM Current Mode Control
• Selectable light load SKIP mode
• 600µA quiescent current (SKIP-Mode)
•0.5µA shutdown current
• Cycle-by-Cycle current limiting
•Frequency foldback protection
• Adjustable under-voltage lockout
•Precision 1.245V reference output
• 16 pin SOIC and QSOP package options
• Selectable 50% maximum duty cycle for flyback applica-
tions
Applications
• DC power distribution systems
•Wireless Modems
• ADSL line cards
• SLIC power supplies
•1-and 2-cell Li Ion battery operated equipment
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Ordering Information
Part Number Ambient
Standard Pb-Free Frequency (kHz) Voltage Temp. Range Package
MIC2186BM MIC2186YM 100 / 200 / 400 Adj –40°C to +125°C 16-lead SOP
MIC2186BQS MIC2186YQS 100 / 200 / 400 Adj –40°C to +125°C 16-lead QSOP
MIC2186 Micrel, Inc.
M9999-042205 2 April 2005
Pin Description
Pin Number Pin Name Pin Function
1 VINA Input voltage to control circuitry (2.9V to 14V).
2 SKIP SKIP (Input): Regulator operates in PWM mode (no pulse skipping) when
pin is pulled low, and skip mode when raised to Vdd. There is no automatic
switching between PWM and skip mode available on this device.
3SSSoft start reduces the inrush current and delays and slows the output voltage
rise time. A 5µA current source will charge the capacitor up to Vdd.
4 COMP Compensation (Output): Internal error amplifier output. Connect to a
capacitor or series RC network to compensate the regulator’s control loop.
5 SGND Small signal ground: must be routed separately from other grounds to the (-)
terminal of Cout.
6FBFeedback Input - regulates FB to 1.245V.
7 EN/UVLO Enable/Undervoltage Lockout (input): A low level on this pin will power down
the device, reducing the quiescent current to under 0.5µA. This pin has two
separate thresholds, below 1.5V the output switching is disabled, and below
0.9V the device is forced into a complete micropower shutdown. The 1.5V
threshold functions as an accurate undervoltage lockout (UVLO) with 135mV
hysteresis.
8 VREF The 1.245V reference is available on this pin. A 0.1µF capacitor should be
connected form this pin to SGnd.
9 CSH The (+) input to the current limit comparator. A built in offset of 100mV
between CSH and SGnd in conjunction with the current sense resistor sets
the current limit threshold level. This is also the (+) input to the current
amplifier.
10 VDD 3V internal linear-regulator output. Vdd is also the supply voltage bus for the
chip. Bypass to SGND with 1µF. Maximum source current is 0.5mA.
11 SYNC Frequency Synchronization (Input): Connect an external clock signal to
synchronize the oscillator. Leading edge of signal above 1.5V starts switch-
ing cycle. Connect to SGND if not used.
12 PGND MOSFET driver power ground, connects to the bottom of the current sense
resistor and the (–) terminal of C
IN
.
13 HIDC High Duty Cycle. Sets duty cycle and frequency along with Freq/2. Logic
HIGH sets 85% maximum duty cycle. Logic LOW sets 50% maximum duty
cycle. See applications section for more information.
14 OUTN High current drive for N channel MOSFET. Voltage swing is from ground to
V
IN
. R
ON
is typically 1.6Ω.
15 FREQ/2 Sets duty cycle and frequency along with HiDC. See applications section for
more information.
16 VINP Power input voltage to the gate drive circuitry (2.9V to 14V). This pin is
normally connected to the output voltage.
Pin Configuration
1VINA
SKIP
SS
COMP
SGND
FB
EN/UVLO
VREF
16 VINP
FREQ/2
OUTN
HIDC
PGND
SYNC
VDD
CSH
15
14
13
12
11
10
9
2
3
4
5
6
7
8
16-pin Narrow Body SOP (M)
16-pin QSOP (QS)
April 2005 3 M9999-042205
MIC2186 Micrel, Inc.
Electrical Characteristics
V
IN
A = 5V, V
IN
P = V
OUT
= 12V, SKIP = 0V, FREQ/2 = 0V, HiDC = 3V, V
CSH
= 0V, T
J
= 25°C, unless otherwise specified. Bold values
indicate –40°C < T
J
< +125°C.
Parameter Condition Min Typ Max Units
Regulation
Feedback Voltage Reference (±1%) 1.233 1.245 1.258 V
(±2%) 1.220 1.270 V
3V ≤ V
IN
A ≤ 9V; 0mV ≤ CSH ≤ 75mV; (±3%) 1.208 1.245 1.282 V
Feedback Bias Current 50 nA
Output Voltage Line Regulation 3V ≤ V
IN
A ≤ 9V +0.08 % / V
Output Voltage Load Regulation 0mV ≤ CSH ≤ 75mV –1.2 %
Input & V
DD
Supply
V
IN
A Input Current, PWM mode V
SKIP
= 0V 0.7 mA
V
IN
P Input Current, PWM mode V
SKIP
= 0V (excluding external MOSFET gate current) 2.8 mA
V
IN
A Input Current, SKIP mode V
SKIP
= 5V 0.6 mA
Shutdown Quiescent Current VEN/UVLO = 0V; (I
VINA
+ I
VINP
) 0.5 5 µA
Digital Supply Voltage (VDD) I
L
= 0 2.82 3.0 3.18 V
Digital Supply Load Regulation I
L
= 0 to 0.5mA 0.03 V
Undervoltage Lockout V
DD
upper threshold (turn on threshold) 2.9 2.75 V
V
DD
lower threshold (turn off threshold) 2.65 V
Reference Output (V
REF
)
Reference Voltage (±1.5%) 1.226 1.245 1.264 V
(±2.5%) 1.213 1.276 V
Reference Voltage Line 5V < VinA < 9V 2 mV
Regulation
Reference Voltage Load 0 < I
REF
< 100µA1mV
Regulation
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
IN
A, V
IN
P) ......................................... 15V
Digital Supply Voltage (V
DD
) ........................................... 7V
SKIP Pin Voltage (V
SKIP
) ................................. –0.3V to 7V
Max Duty Cycle Pin Voltage (V
HIDC
) ................ –0.3V to 7V
Frequency Divider Pin Voltage (V
FREQ/2
) ........ –0.3V to 7V
Sync Pin Voltage (V
SYNC
) ................................ –0.3V to 7V
Comp Pin Voltage (V
COMP
) .............................. –0.3V to 3V
Feedback Pin Voltage (V
FB
) ............................ –0.3V to 3V
Enable Pin Voltage (V
EN/UVLO
) ...................... –0.3V to 15V
Current Sense Voltage (V
CSH
) ......................... –0.3V to 1V
Power Dissipation (P
D
)
16 lead SOP .............................. 400mW @ T
A
= 85°C
16 lead QSOP ........................... 245mW @ T
A
= 85°C
Ambient Storage Temp ............................ –65°C to +150°C
ESD Rating (Note 3)
Operating Ratings (Note 2)
Supply Voltage (V
IN
A, V
IN
P) ........................ +2.9V to +14V
Operating Ambient Temperature......... –40°C ≤ T
A
≤ +85°C
Junction Temperature ....................... –40°C ≤ T
J
≤ +125°C
PackageThermal Resistance
θ
JA
16-lead SOP ............................................... 100°C/W
θ
JA
16-lead QSOP ............................................. 163°C/W
P1-P3P4-P6P7-P9P10-P12P13-P15

MIC2186YQS-TR

Mfr. #:
Buy MIC2186YQS-TR
Manufacturer:
Microchip Technology / Micrel
Description:
Switching Controllers Low Voltage Asynchronous Boost PWM Control
Lifecycle:
New from this manufacturer.
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