Datasheet MIC2141-BM5 Datasheet (MICREL)

MIC2141 Micrel

MIC2141

Micropower Boost Converter

Preliminary Information

General Description

The MIC2141 is a micropower boost switching regulator that
can operate from 3- or 4-cell nickel-metal-hydride batteries or
a single Li-ion cell. This regulator employs a constant 330kHz,
fixed 18% duty-cycle, gated-oscillator architecture.

The MIC2141 can be used in applications where the output
voltage must be dynamically adjusted. The device features a
control signal input which is used to proportionally adjust the
output voltage. The control signal input has a gain of 6,
allowing a 0.8V to 3.6V control signal to vary a 4.8V to 22V
output.

The MIC2141 requires only three external components to
operate and is available in a tiny 5-lead SOT-23 package for
space and power-sensitive portable applications. The
MIC2141 draws only 70µA of quiescent current and can
operate with an efficiency exceeding 85%.

Features

• Implements low-power boost, SEPIC, or flyback

• 2.5V to 14V input voltage

• 330kHz switching frequency

•<2µA shutdown current

•70µA quiescent current

• 1.24V bandgap reference

• typical output current 1mA to 10mA

• SOT-23-5 Package

Applications

• LCD bias supply

• CCD digital camera supply

Ordering Information

Part Number Junction Temp. Range Package

MIC2141-BM5 –40°C to +85°C SOT-23-5

Typical Application

(from DAC)

VC*

10µH

MIC2141

15
2
34

10µF

Variable
V

OUT

(V)
V

vs. Output Voltage

4.0

3.5

3.0

2.5

2.0

C

1.5

1.0

0.5
0

0 5 10 15 20 25

DAC-Controlled LCD Bias Voltage Supply

Control Voltage

V

(V)

OUT

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com

June 2000 1 MIC2141

MIC2141 Micrel

Pin Configuration

GND

2

IN

13

Part
Identification

VCFB

SW

SAxx

45

SOT-23-5 (BM)

Pin Description

Pin Number Pin Name Pin Function

1 IN Input: +2.5V to +14V supply for internal circuity.
2 GND Ground: Return for internal circuitry and internal MOSFET (switch) source.
3 SW Switch Node (Input): Internal MOSFET drain; 22V maximum.
4 FB Feedback (Input): Output voltage sense node. Compared to V

input voltage.

5 VC Control (Input): Output voltage control signal input. Input voltage of 0.8V to

3.6V is proportional to 4.8V to 22V output voltage (gain of 6). If the pin is not
connected, the output voltage will be VIN – 0.5V.

control

C

MIC2141 2 June 2000

MIC2141 Micrel

Absolute Maximum Ratings (Note 1)

Supply Voltage (VIN) ...................................................+18V

Switch Voltage (V
Feedback Voltage (F
Control Input Voltage (VC), Note 3 ..VIN–200mV ≤ VC ≤ 4V

ESD Rating, Note 4 ...................................................... 2kV

)..................................................+24V

SW

)................................................+24V

B

Operating Ratings (Note 2)

Supply Voltage (VIN) .................................... +2.5V to +14V

Switch Voltage (V
Ambient Temperature (T

Junction Tempgserature (TJ) ................... –40°C to +125°C

Package Thermal Resistance

)...................................... +3V to +22V

SW

).........................–40°C to +85°C

A

SOT-23-5 (θJA)......................................................220°C/W

Electrical Characteristics

VIN = 3.6V, V

Parameter Condition Min Typ Max Units

Input Voltage 2.5 14 V
Quiescent Current Switch off, VIN = 3.6V 70 100 µA
Comparator Hysteresis 10 mV
Control Voltage Gain (V
Controlled Output Voltage, VC = 0.8V; 2.5V ≤ VIN ≤ 4.2V 4.85 5.0 5.15 V

Note 3

Load Regulation 100µA ≤ I
Line Regulation 2.5V ≤ VIN ≤ 12V; I
Switch On-Resistance ISW = 100mA, VIN = 3.6V 4 Ω

Oscillator Frequency 300 330 360 kHz
Oscillator Duty Cycle 15 18 %

OUT

= 5V; I

= 1mA; TJ = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless noted.

OUT

) 2.5V ≤ VIN ≤ 12V, V

OUT/VC

VC = 2.5V; 2.7V ≤ VIN ≤ 12V 14.55 15.0 15.45 V
VC = 3.4V; 3.6V ≤ VIN ≤ 12V 19.4 20.0 20.6 V

ISW = 100mA, VIN = 12V 2.5 Ω

≤ 1mA, V

OUT

= 15V 6

OUT

= 15V 0.25 1 %

OUT

≤ 1mA 0.05 0.2 %/V

OUT

Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. VC = 4V sets V
Note 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.

to 24V (absolute maximum level on VSW); VC must be ≤ VIN – 200mV.

OUT

June 2000 3 MIC2141

MIC2141 Micrel

µ

Typical Characteristcs

Feedback Current

vs. Output Voltage

25

20

15

10

5

FEEDBACK CURRENT (µA)

0

0 5 10 15 20 25

OUTPUT VOLTAGE (V)

Control Current

vs. Control Voltage

7
6
5
4
3
2
1

CONTROL CURRENT (nA)

0

01234

CONTROL VOLTAGE (V)

Control Voltage

vs. Output Voltage

20

VIN = 5V
L = 33µH

15

= 100mA

L = 33

= 150mA

L = 22µH

VIN = 2.5V

H

VIN = 5V

10

5

OUTPUT VOLTAGE (V)

15.00

14.95

14.90

14.85

OUTPUT VOLTAGE (V)

14.80

VIN = 3.6V

0

01234

CONTROL VOLTAGE (V)

Load Regulation

I

PEAK

I

PEAK

012345

LOAD CURRENT (mA)

Gain

vs. Output Voltage

6.4

6.3

6.2

6.1

GAIN

6.0

5.9

5.8

5.7
0 5 10 15 20 25

OUTPUT VOLTAGE (V)

15.0

14.8

14.6

14.4

14.2

OUTPUT VOLTAGE (V)

14.0

Line Regulation

24681012

INPUT VOLTAGE (V)

VIN = 5V

L = 33µH

L = 33µH
I

= 100µA

L

Oscillator Frequency

400

380

360

340

FREQUENCY (kHz)

320

300

vs. Input Voltage

2 4 6 8 10121416

INPUT VOLTAGE (V)

Frequency

350

340

330

320

FREQUENCY (kHz)

310

300

vs. Temperature

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

Quiescent Current

280
240
200
160
120

QUIESCENT CURRENT (µA)

vs. Input Voltage

80
40

0

0246810121416

INPUT VOLTAGE (V)

0.60

0.58

0.56

0.54

ON-TIME (µs)

0.52

0.50

Duty Cycle

vs. Temperature

20
19
18
17
16
15
14
13

DUTY CYCLE (%)

12
11
10

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

On-Time

vs. Temperature

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

MIC2141 4 June 2000

MIC2141 Micrel

14.00

14.20

14.40

14.60

14.80

15.00

-40 -20 0 20 40 60 80 100

OUTPUT VOLTAGE (V)

TEMPERATURE (°C)

0

10

20

30

40

50

60

70

80

90

100

01234

EFFICIENCY (%)

OUTPUT CURRENT (mA)

0

1

2

3

4

5

6

7

8

-40 -20 0 20 40 60 80 100

R

DS(on)

(Ω)

TEMPERATURE (°C)

Quiescent Current

vs. Temperature

88

86

84

82

80

QUIESCENT CURRENT (µA)

78

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

VIN = 5V

Switch Voltage Drop

vs. Temperature

VIN = 3.3V
I

= 100mA

D

0

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

(mV)

DS

V

800
700
600
500
400
300
200
100

Output Voltage

vs. Temperature

VIN = 5V
L = 33µH

Switch On-Resistance

vs. Temperature

VIN = 3.3V

Gain

6.00

5.98

5.96

GAIN

5.94

5.92

5.90

vs. Temperature

VIN = 5V

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

Switch Voltage Drop

vs. Input Voltage

IDS = 100mA

0

2 4 6 8 10 12 14

INPUT VOLTAGE (V)

(mV)

DS

V

900
800
700
600
500
400
300
200
100

9
8
7
6
5
4
3
2

ON-RESISTANCE (Ω)

1
0

2 4 6 8 10 12 14

June 2000 5 MIC2141

On-Resistance vs.

Input Voltage

INPUT VOLTAGE (V)

Efficiency

BAT54HT1 Diode

1N4148 Diode

VIN = 5V
V

= 15V

OUT

L = 33µH

Ripple Voltage vs.

90
80
70
60
50
40
30
20

RIPPLE VOLTAGE (mV)

10

0

Input Voltage

L = 100µH

V

= 15V

OUT

I

= 1mA

L

24681012

INPUT VOLTAGE (V)

MIC2141 Micrel

Functional Diagram

IN

Bandgap

Reference

VC

FB

MIC2141

Oscillator

330kHz

FIXED DUTY CYCLE

Functional Description

See “Applications Information” for component selection and
predesigned circuits.

Overview

This MIC2141 is a fixed-duty-cycle, constant-frequency, gated­oscillator, micropower, switch-mode power supply controller.
Quiescent current for the MIC2141 is only 70µA in the switch
off state, and since a MOSFET output switch is used, addi­tional current needed for switch drive is minimized. Efficien­cies above 85% throughout most operating conditions can be
realized.

Regulaton

Regulation is performed by a hysteretic comparator which
regulates the output voltage by gating the internal oscillator.
The user applies a programming voltage to the VC pin. (For
a fixed or adjustable output regulator, with an internal refer­ence, use the MIC2142.) The output voltage is divided down
internally and then compared to the VC, the control input
voltage, forcing the output voltage to 6 times the VC. The
comparator has hysteresis built into it, which determines the
amount of low frequency ripple that will be present on the
output. Once the feedback input to the comparator exceeds
the control voltage by 10mV, the high-frequency oscillator
drive is removed from the output switch. As the feedback
input to the comparator returns to the control voltage level,
the comparator is reset and the high-frequency oscillator is
again gated to the output switch. Typically 10mV of hysteresis
seen at the comparator will correspond to 60mV of low­frequency ripple at the output. Applications, which require
continuous adjustment of the output voltage, can do so by
adjustment of the VC control pin.

SW

GND

Output

The maximum output voltage is limited by the voltage capa­bility of the output switch. Output voltages up to 22V can be
achieved with a standard boost circuit. Higher output volt­ages require a flyback configuration.

Output Voltage Control

The internal hysteretic comparator disables the output drive
once the output voltage exceeds the nominal by 30mV. The
drive is then enabled once the output voltage drops below the
nominal by 30mV.

The reference level, which actually programs the output
voltage, is set by the VC control input. The output is 6 times
the control voltage (VC) and the output ripple will be 6 times
the comparator hystersis. Therefore, with 10mV of hystersis,
there will be ±30mV variation in the output around the nominal
value. See the “Typical Characteristics: Control Voltage vs.
Output Voltage” for a graph of input-to-output behavior.

The common-mode range of the comparator requires that the
maximum control voltage (VC) be held to 200mV less than
VIN. When programming for a 20V output, a minimum VIN of

3.5V will be required. See the “Typical Characteristics: Gain
vs. Output Voltage” for a graph of gain behavior. To achieve
20V output at lower input voltages, the external resistive
divider (R1 and R2) shown in Figure 2 can be added. This
circuit will increase the control-to-output gain, while limiting
the error introduced by the tolerance of the internal resistor
feedback network.

MIC2141 6 June 2000

MIC2141 Micrel

Application Information

Predesigned circuit information is at the end of this section.

Component Selection

Boost Inductor

Maximum power is delivered to the load when the oscillator
is gated on 100% of the time. Total output power and circuit
efficiency must be considered when determining the maxi­mum inductor. The largest inductor possible is preferable in
order to minimize the peak current and output ripple. Effi­ciency can vary from 80% to 90% depending upon input
voltage, output voltage, load current, inductor, and output
diode.

Equation 1 solves for the output current capability for a given
inductor value and expected efficiency. Figures 5 through 9
graph estimates for maximum output current, assuming the
minimum duty cycle, maximum frequency, and 85% effi­ciency. To determine the required inductance, find the inter­section between the output voltage and current and select the
value of the inductor curve just above the intersection. If the
efficiency is expected to be other than the 85% used for the
graph, Equation 1 can then be used to better determine the
maximum output capability.

Vt

()

(1)

I

O(max)

=

IN(min)

2L T

MAX

The peak inductor and switch current can be calculated from
Equation 2 or read from the graph in Figure 10. The peak
current shown in Figure 10 is derived assuming a maximum
duty cycle and a minimum frequency. The selected inductor
and diode peak current capability must exceed this value.
The peak current seen by the inductor is calculated at the
maximum input voltage. A wider input voltage range will result
in a higher worst-case peak current in the inductor. This effect
can be seen in Table 4 by comparing the difference between
the peak current at V

tV

ON max IN max

I

PK

=

(2)

IN(min)

()()

L

MIN

DCM/CCM Boundary

Equation 3 solves for the point at which the inductor current
will transition from DCM (discontinuous conduction mode) to

ON

S

and V

2

V

O

eff

IN(max)

1

V

−

IN min

()

.

×

CCM (continuous conduction mode). As the input voltage is
raised above this level the inductor has a potential for
developing a dc component while the oscillator is gated on.
Table 1 display the input points at which the inductor current
can possibly operate in the CCM region. Operation in this
region can result in a peak current slightly higher than
displayed Table 4.

VVV1D

(3)

IN ccm

=+

()

()

OUT

FWD

+−

()

Table 2 lists common inductors suitable for most applica­tions. Table 6 lists minimum inductor sizes versus input and
output voltage. In low-cost, low-peak-current applications,
RF-type leaded inductors may sufficient. All inductors listed
in Table 4 can be found within the selection of CR32- or
LQH4C-series inductors from either Sumida or muRata.

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ataRumC4/C3/C1HQLtnuomecafrus
adimuS23RCtnuomecafrus

relliM.W.JF87dedaellaixa

tfarclioC09dedaellaixa

Table 2. Inductor Examples

Boost Output Diode

Speed, forward voltage, and reverse current are very impor­tant in selecting the output diode. In the boost configuration,
the average diode current is the same as the average load
current. (The peak current is the same as the peak inductor
current and can be derived from Equation 2 or Figure 10.)
Care must be take to make sure that the peak current is
evaluated at the maximum input voltage.

57C°

V

edoiD

0350RBMV572.0V523.0Aµ5.2Aµ09

8414N1

45TAB

58TAB

DWF

ta

Am001

V6.0

V4.0

)C°58(

45.0
)C°58(

C°52

V

DWF

ta

Am001

)C°571(

V59.0

V54.0

V65.0Aµ4.0

mooR

.pmeT

egakaeL

V51ta

An52

)V02(

An01

)V52(

C°57

egakaeL

V51ta

Aµ2.0

)V02(

Aµ1

)V02(

Aµ2

)C5°8(

egakcaP

321DOS

TMS

dedael

TMSdna

TMS

43-OD
dedael

Table 3. Diode Examples

V

TUO

V3.3V40.3
V0.5V04.4
V0.9V06.7

V0.21V0.01
V0.51V4.21
V0.61V2.31
V0.02V4.61
V0.22V0.81

V

)MCC(NI

As can be seen in the “Typical Characteristics: Efficiency”
graph, the output diode type can have an effect on circuit
efficiency. The BAT54- and BAT85-series diodes are low­current Shottky diodes available from On Semiconductor and
Phillips, respectively. They are suitable for peak repetitive
currents of 300mA or less with good reverse current charac­teristics. For applications that are cost driven, the 1N4148, or
equivalent, will provide sufficient switching speed with greater
forward drop and reduced cost. Other acceptable diodes are
On Semiconductor’s MBR0530 or Vishay’s B0530, although
they can have reverse currents that exceed 1mA at very high
junction temperatures. Table 3 summarizes some typical

Table 1. DCM/CCM Boundary

performance characteristics of various suitable diodes.

June 2000 7 MIC2141

MIC2141 Micrel

Output Capacitor

If the availability of tantalum capacitors is limited, ceramic
capacitors and inexpensive electrolyics may be necessary.
Selection of the capacitor value will depend upon on the peak
inductor current and inductor size. MuRata offers the GRM
series with up to 10µF at 25V, with a Y5V temperature
coefficient, in a 1210 surface-mount package. Low-cost
applications can use M-series leaded electrolytic capacitors
from Panasonic. In general, ceramic, electrolytic, or tantalum
values ranging from 10µF to 47µF can be used for the output
capacitor.

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ataRumMRGV5Ycimarectnuomecafrus

yahsiV495mulatnattnuomecafrus

cinosanaPseires-Mcitylortcelededael

Table 4. Capacitor Examples

Design Example

Given a design requirement of 12V output and 1mA load with
a minimum input voltage of 2.5V, Equation 1 can be used to
calculate to maximum inductance or it can be read from the
graph in Figure 4. Once the maximum inductance has been
determined, the peak current can be determined using Equa­tion 2 or Figure 10.

V

= 12V

OUT

I

= 1mA

OUT

VIN = 4.8V to 2.5V

L

Vt

==

MAX

I

O(max)

L17H

==

MAX

µ

22

IN(min)

V

eff

⋅⋅

ON(min)

O

V2

−−⋅⋅⋅⋅

IN(min)

T

S(min)

Select 15µH ±10%.

tV

==
==

ON(max)

I

PEAK

I 272mA

PEAK

L

⋅⋅

MIN

IN(max)

0.767 s

==

µ

4.8V

13.5 H

µ

Select a BAT54 diode and CR32 inductor.
Always check the peak current to insure that it is within the

limits specified in the load line shown in Figure 10 for all
input and output voltages.

Gain Boost

Use Figure 2 to increase the voltage gain of the system. The
typical gain can easily be increased from the nominal gain of
6 to a value of 8 or 10. Figure 2 shows a gain of 8 so that with

2.5V applied to VC, V

will be 20V.

OUT

Bootstrap

The bootstrap configuration is used to increase the maximum
output current for a given input voltage. This is most effective
when the input voltage is less than 5V. Output current can
typically be tripled by using this technique. See Table 4a. for
bootstrap-ready-built component values.

+2.7V to +12V

+2.7V to +12V

+2.7V to +4.7V

V

V

Return

IN

C

V

10µF

V

Return

V

10µF

V

Return

CR2

1N4148

10µF

IN

C2

25V

C

C4

0.1µF

1

IN

5

VC

L1

33µH

MIC2141

GND

SW

FB

CR1

BAT54HT1

3
4
2

Figure 1. Basic Configuration

IN

C2

25V

C

C4

0.1µF

4

IN

5

VC

L1

22µH

MIC2141

GND

SW

FB

CR1

BAT54HT1

34.8k

3

I

2
1

121k

Figure 2. Gain-Boost Configuration

C2

25V

C4

0.1µF

1

IN

5

VC

L1

4.7µH

MIC2141

GND

SW

FB

MBR0530

1N4148

3
4
2

CR1

CR3

Figure 3. Bootstrap Configuration

R1

FB

R2

C1
10µF
25V

C1
10µF
25V

C1
10µF
25V

V
+12V

Return

V

OUT

+5V to +15V

Return

V

OUT

+5V to +20V

V6V1

OUT C

I 15 A for V 15V

FB(typ)

Return

OUT



==++




====µ

R1
R2



++⋅⋅

IR1



FB



OUT

MIC2141 8 June 2000

MIC2141 Micrel

Inductor Selection Guides

40

3.9µH

4.7µH

10

15µH
18µH

22µH
27µH

33µH
39µH
47µH
56µH

68µH
82µH

100µH
120µH

1

MAX. OUTPUT CURRENT (mA)

150µH
180µH

220µH

VIN = 2.5V

200

4.7µH

100

10µH
12µH

15µH
18µH
22µH
27µH

33µH
39µH

47µH
56µH

10

68µH
82µH

100µH
120µH
150µH

180µH
220µH

MAX. OUTPUT CURRENT (mA)

1

VIN = 3.3V

Use for Li-ion battery

0.1
0246810121416182022

OUTPUT VOLTAGE (V)

Figure 5. Inductor Selection for VIN = 2.5V

0.1
0246810121416182022

OUTPUT VOLTAGE (V)

Figure 6. Inductor Selection for VIN = 3.3V

June 2000 9 MIC2141

MIC2141 Micrel

200

8.2µH

100

10µH
12µH
15µH
18µH
22µH
27µH
33µH

39µH
47µH
56µH

68µH
82µH

10

100µH
120µH

150µH
180µH

220µH

MAX. OUTPUT CURRENT (mA)

1

VIN = 5V

100

15µH
18µH

22µH

27µH

33µH
39µH

47µH

56µH

68µH

82µH

10

100µH
120µH

150µH

MAX. OUTPUT CURRENT (mA)

180µH

220µH

270µH

VIN = 9V

0.1

2 4 6 8 10 12 14 16 18 20 22

Figure7. Inductor Selection for V

OUTPUT VOLTAGE (V)

IN

= 5V

330µH
390µH

470µH

1

8 10 12 14 16 18 20 22

OUTPUT VOLTAGE (V)

Figure 8. Inductor Selection for VIN = 9V

MIC2141 10 June 2000

MIC2141 Micrel

100

10

22µH 18µH

27µH

33µH
39µH

47µH
56µH

68µH
82µH

100µH
120µH

150µH

180µH

220µH

VIN = 12V

270µH

330µH

MAX. OUTPUT CURRENT (mA)

390µH
470µH

1

10 12 14 16 18 20 22

OUTPUT VOLTAGE (V)

Figure 9. Inductor Selection for VIN = 12V

June 2000 11 MIC2141

MIC2141 Micrel

1000

900

800

700

600

500

PEAK CURRENT (mA)

400

300

3.9µH

4.7µH

8.2µH

10µH

12µH

15µH

18µH

22µH

27µH

33µH

39µH

47µH

200

100

0

02468101214

INPUT VOLTAGE (V)

56µH
68µH
82µH

100µH
120µH

150µH

180µH
220µH
270µH
330µH
390µH
470µH

Figure 10. Peak Inductor Current vs. Input Voltage

MIC2141 12 June 2000

MIC2141 Micrel

Predesigned Circuit Values

I

V

IN(min)

V

IN(max)

V

OUT

I

OUT(max)

L1 CR1 (VIN = V

PEAK

– 0.5V) or 14V (VIN = V

OUT

2.5V 4.5V 5.0V 4mA 15µH BAT54 230mA 128mA
3mA 18µH BAT54 192mA 106mA
2mA 27µH BAT54 128mA 71mA
1mA 56µH BAT54 62mA 34mA

0.5mA 120µH BAT54 29mA 16mA

5V bootstrap 14.8mA 3.9µH MBR0503 890mA 500mA

2.5V 11.5V 12V 1mA 15µH MBR0530 588mA 128mA

0.5mA 33µH BAT54 267mA 58mA

0.2mA 82µH BAT54 108mA 23mA

2.5V 4.7V 12V bootstrap 3.5mA 4.7µH MBR0503 750mA 500mA

2.5V 4.7V 12V bootstrap 4.3mA 3.9µH MBR0503 900mA 500mA

2.5V 14V 15V 0.8mA 15µH MBR0530 741mA 128mA

0.5mA 27µH MBR0530 412mA 71mA

0.2mA 68µH BAT54 163mA 28mA

2.5V 14V 16V 0.8mA 15µH MBR0530 710mA 128mA

0.5mA 22µH MBR0530 456mA 87mA

0.2mA 56µH BAT54 190mA 34mA

2.5V 14V 22V 0.5mA 15µH MBR0530 590mA 128mA

0.2mA 39µH BAT54 274mA 49mA

0.1mA 82µH BAT54 130mA 23mA

3.0V 4.5V 5V 10mA 12µH BAT54 288mA 190mA

use for Li-ion

battery range

3.6mA 27µH BAT54 128mA 85mA

0.8mA 120µH BAT54 29mA 19mA

5V bootstrap 20mA 4.7µH MBR0530 730mA 450mA

3.0V 8.5V 9V 3mA 12µH MBR0530 652mA 190mA

use for Li-ion
battery range

1.7mA 22µH MBR0530 296mA 103mA

0.8mA 47µH MBR0530 139mA 49mA

3.0V 4.7V 9V bootstrap 8mA 4.7µH MBR0503 750mA 450mA

use for Li-ion
battery range

3.0V 11.5V 12V 2.1mA 12µH MBR0530 882mA 190mA

use for Li-ion
battery range

1.7mA 15µH MBR0530 588mA 156mA
1mA 27µH MBR0530 327mA 85mA

0.45mA 56µH BAT54 157mA 40mA

3.0V 4.7V 12V bootstrap 5.4mA 4.7µH MBR0530 750mA 450mA

use for Li-ion
battery range

3.0V 14V 15V 1.6mA 12µH MBR0530 926mA 190mA

use for Li-ion
battery range

0.87mA 22µH MBR0530 505mA 103mA

0.41mA 47µH BAT54 237mA 49mA

3.0V 4.7V 15V bootstrap 4mA 4.7µH MBR0530 750mA 450mA

use for Li-ion
battery range

3.0V 14V 22V 1mA 10µH MBR0530 1071mA 190mA

use for Li-ion
battery range

0.8mA 15µH MBR0530 714mA 152mA

0.46mA 27µH MBR0530 400mA 85mA

0.2mA 68µH BAT54 157mA 3.3mA

I

PEAK

IN(min)

)

Table 4a. Typical Configurations for Wide-Range Inputs—2.5V to 3.0V Minimum Input

June 2000 13 MIC2141

MIC2141 Micrel

V

IN(min)

V

IN(max)

V

OUT

I

OUT(max)

L1 CR1 (VIN = V

I

PEAK

– 0.5V) (VIN = V

OUT

I

PEAK

5.0V 8.5V 9V 17mA 8.2µH MBR0530 795mA 467mA
15mA 10µH MBR0530 652mA 383mA
10mA 12µH MBR0530 643mA 319mA

5mA 27µH BAT54 241mA 142mA
1mA 120µH BAT54 54mA 32mA

5.0V 11.5V 12V 10mA 8.2µH MBR0530 1,075mA 467mA

5mA 18µH MBR0530 490mA 213mA
2mA 39µH BAT54 226mA 98mA
1mA 82µH BAT54 108mA 47mA

5.0V 14V 15V 7mA 8.2µH MBR0530 1356mA 467mA

5mA 12µH MBR0530 926mA 319mA
2mA 27µH MBR0530 412mA 142mA
1mA 56µH BAT54 199mA 68mA

5.0V 14V 16V 2.5mA 22µH MBR0530 986mA 174mA

1mA 56µH BAT54 190mA 68mA

0.5mA 120µH BAT54 90mA 32mA

5.0V 14V 22V 1.7mA 22µH MBR0530 486mA 174mA

1.0mA 39µH BAT54 274mA 98mA

0.5mA 82µH BAT54 130mA 47mA

0.1mA 180µH BAT54 60mA 21mA

9.0V 11.5V 12V 33mA 15µH MBR0530 588mA 460mA
20mA 22µH MBR0530 401mA 314mA
10mA 47µH BAT54 188mA 147mA

5mA 100µH BAT54 88mA 69mA
1mA 470µH BAT54 19mA 15mA

9.0V 14V 15V 20mA 15µH MBR0530 741mA 460mA
10mA 27µH MBR0530 412mA 256mA

5mA 56µH BAT54 199mA 123mA
2mA 150µH BAT54 74mA 46mA
1mA 270µH BAT54 41mA 26mA

9.0V 14V 20V 4.5mA 39µH BAT54 215mA 177mA

2mA 68µH BAT54 131mA 84mA
1mA 150µH BAT54 72mA 46mA

9.0V 14V 22V 4mA 39µH BAT54 275mA 177mA

2mA 68µH BAT54 157mA 101mA
1mA 150µH BAT54 72mA 46mA

12V 14V 15V 45mA 18µH MBR0530 618mA 511mA

20mA 39µH BAT54 285mA 236mA
10mA 82µH BAT54 136mA 112mA

5mA 150µH BAT54 74mA 61mA

1.7mA 470µH BAT54 24mA 20mA

12V 14V 20V 8mA 47µH BAT54 230mA 196mA

5mA 68µH BAT54 158mA 135mA
2mA 120µH BAT54 90mA 77mA
1mA 390µH BAT54 27mA 24mA

12V 21.5V 22V 7mA 47µH BAT54 228mA 196mA

5mA 68µH BAT54 157mA 135mA
2mA 150µH BAT54 69mA 61mA
1mA 220µH BAT54 47mA 42mA

IN(min)

)

Table 4b. Typical Configurations for Wide-Range Inputs—5V to 15V Minimum Input

MIC2141 14 June 2000

MIC2141 Micrel

I

V

IN

V

OUT

I

OUT

L1 CR1 (typical)

PEAK

3.3V ±5% 5V 13mA 10µH BAT54 253mA
9V 5mA 10µH BAT54 253mA

12V 3mA 10µH BAT54 253mA
15V 2.3mA 10µH BAT54 253mA
20V 1.7mA 10µH BAT54 253mA

5V ±5% 9V 17mA 8.2µH MB0530 467mA

12V 10.4mA 8.2µH MB0530 467mA
15V 7.5mA 8.2µH MB0530 467mA
20V 2.2mA 22µH MB0530 174mA

12V ±5% 15V 44mA 18µH MB0530 511mA

20V 8.3mA 47µH BAT54 196mA

Table 5. Typical Maximum Power Configuration for Regulated Inputs

Output Voltage

V

IN

16V to 22V 4.5V to 15V

2.5V 15µH15µH

3.0V 12µH12µH

3.3V 10µH10µH

3.5V 8.2µH 8.2µH

4.0V 27µH 6.8µH

4.5V 27µH 6.8µH

5.0V 22µH 8.2µH

6.0V 27µH10µH

7.0V 27µH10µH

8.0V 33µH12µH

9.0V 39µH15µH
10V 39µH15µH
11V 47µH18µH
12V 47µH18µH
13V 56µH22µH
14V 56µH22µH
15V 56µH27µH
16V 68µH27µH

Table 6. Minimum Inductance

Manufacturer Web Address

muRata www.MuRata.com
Sumida www.sumida.com
Coilcraft www.coilcraft.com

J. W. Miller www.jwmiller.com

Micrel www.micrel.com

Vishay www.vishay.com

Panasonic www.panasonic.com

Table 7. Component Supplier Websites

June 2000 15 MIC2141

MIC2141 Micrel

Package Information

1.90 (0.075) REF

0.95 (0.037) REF

3.02 (0.119)

2.80 (0.110)

0.50 (0.020)

0.35 (0.014)

1.75 (0.069)

1.50 (0.059)

1.30 (0.051)

0.90 (0.035)

0.15 (0.006)

0.00 (0.000)

SOT-23-5 (M)

3.00 (0.118)

2.60 (0.102)

10°

0°

DIMENSIONS:

MM (INCH)

0.20 (0.008)

0.09 (0.004)

0.60 (0.024)

0.10 (0.004)

MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 [phone] FAX + 1 [phone] WEB http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

© 2000 Micrel Incorporated

MIC2141 16 June 2000