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MIC2570-2YM

P1-P3P4-P6P7-P9P10-P12P13-P15
August 2007 1 MIC2570
MIC2570 Micrel, Inc.
MIC2570
Two-Cell Switching Regulator
General Description
Micrel’s MIC2570 is a micropower boost switching regulator
that operates from two alkaline, two nickel-metal-hydride
cells, or one lithium cell.
The MIC2570 accepts a positive input voltage between 1.3V
and 15V. Its typical no-load supply current is 130µA.
The MIC2570 is available in selectable fixed output or ad-
justable output versions. The MIC2570-1 can be configured
for 2.85V, 3.3V, or 5V by connecting one of three separate
feedback pins to the output. The MIC2570-2 can be config-
ured for an output voltage ranging between its input voltage
and 36V, using an external resistor network.
The MIC2570 has a fixed switching frequency of 20kHz. An
external SYNC connection allows the switching frequency to
be synchronized to an external signal.
The MIC2570 requires only four components (diode, inductor,
input capacitor and output capacitor) to implement a boost
regulator. A complete regulator can be constructed in a 0.6
in
2
area.
All versions are available in an 8-lead SOIC with an operating
range from –40°C to +85°.
Typical Applications
Features
• Operates from a two-cell supply
1.3V to 15V operation
• 130µA typical quiescent current
• Complete regulator fits 0.6 in
2
area
• 2.85V/3.3V/5V selectable output voltage (MIC2570-1)
• Adjustable output up to 36V (MIC2570-2)
• 1A current limited pass element
• Frequency synchronization input
• 8-lead SOIC package
Applications
• LCD bias generator
• Glucose meters
• Single-cell lithium to 3.3V or 5V converters
• Two-cell alkaline to ±5V converters
• Two-cell alkaline to –5V converters
• Battery-powered, hand-held instruments
• Palmtop computers
• Remote controls
• Detectors
• Battery Backup Supplies
Two-Cell to 5V DC-to-DC Converter
IN
S W
GND
MIC2570-1
C2
220µF
10V
5V/100mA
C1
100µF
10V
2.0V–3.1V
2 AA Cells
2.85V
3.3V
5V
2
4
5
6
1
7
8
L1
47µH
S Y NC
D1
MBRA140
Single-Cell Lithium to 3.3V/80mARegulator
GND
3.3V
S W
MIC2570
S Y NC
7
5
1
2
8
IN
C3
330µF
6.3V
V
OU T
3.3V/80mA
2.5V to 4.2V
1 Li Cell
C1
100µF
10V
D1
MBRA140
L1
50µH
L1
C2
100µF
10V
U1
1 2
3
4
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
MIC2570 Micrel, Inc.
MIC2570 2 August 2007
Ordering Information
Part Number Temperature
Range
Voltage
Frequency
Package
Standard Pb-Free
MIC2570-1BM MIC2570-1YM –40ºC to +85ºC Selectable* 20kHz 8-pin SOIC
MIC2570-2BM MIC2570-2YM –40ºC to +85ºC Adjustable 20kHz 8-pin SOIC
* Externally selectable for 2.85V, 3.3V, or 5V
Pin Configuration
1
2
3
4
8
7
6
5
S W
GND
NC
5V
IN
S Y NC
2.85V
3.3V
MIC2570-1
Selectable Voltage
20kHz Frequency
1
2
3
4
8
7
6
5
IN
S Y NC
FB
NC
S W
GND
NC
NC
MIC2570-2
Adjustable Voltage
20kHz Frequency
8-Lead SOIC (M)
Pin Description
Pin No. (Version
†
) Pin Name Pin Function
1 SW Switch: NPN output switch transistor collector.
2 GND Power Ground: NPN output switch transistor emitter.
3 NC Not internally connected.
4 (-1) 5V 5V Feedback (Input): Fixed 5V feedback to internal resistive divider.
4 (-2) NC Not internally connected.
5 (-1) 3.3V 3.3V Feedback (Input): Fixed 3.3V feedback to internal resistive divider.
5 (-2) NC Not internally connected.
6 (-1) 2.85V 2.85V Feedback (Input): Fixed 2.85V feedback to internal resistive divider.
6 (-2) FB Feedback (Input): 0.22V feedback from external voltage divider network.
7 SYNC Synchronization (Input): Oscillator start timing. Oscillator synchronizes to
falling edge of sync signal.
8 IN Supply (Input): Positive supply voltage input.
†
Example: (-1) indicates the pin description is applicable to the MIC2570-1 only.
August 2007 3 MIC2570
MIC2570 Micrel, Inc.
Electrical Characteristics
V
IN
= 2.5V; T
A
= 25°C, bold indicates –40°C ≤ T
A
≤ 85°C; unless noted
Parameter Condition Min Typ Max Units
Input Voltage Startup guaranteed, I
SW
= 100mA 1.3 15 V
Quiescent Current Output switch off 130 µA
Fixed Feedback Voltage MIC2570-1; V
2.85V pin
= V
OUT
, I
SW
= 100mA 2.7 2.85 3.0 V
MIC2570-1; V
3.3V pin
= V
OUT
, I
SW
= 100mA 3.14 3.30 3.47 V
MIC2570-1; V
5V pin
= V
OUT
, I
SW
= 100mA 4.75 5.00 5.25 V
Reference Voltage MIC2570-2, [adj. voltage versions], I
SW
= 100mA, Note 1 208 220 232 mV
Comparator Hysteresis MIC2570-2, [adj. voltage versions] 6 mV
Output Hysteresis MIC2570-1; V
2.85V pin
= V
OUT
, I
SW
= 100mA 65 mV
MIC2570-1; V
3.3V pin
= V
OUT
, I
SW
= 100mA 75 mV
MIC2570-1; V
5V pin
= V
OUT
, I
SW
= 100mA 120 mV
Feedback Current MIC2570-1; V
2.85V pin
= V
OUT
6 µA
MIC2570-1; V
3.3V pin
= V
OUT
6 µA
MIC2570-1; V
5V pin
= V
OUT
6 µA
MIC2570-2 [adj. voltage versions]; V
FB
= 0V 25 nA
Reference Line Regulation 1.5V ≤ V
IN
≤ 15V 0.35 %/V
Switch Saturation Voltage V
IN
= 1.3V, I
SW
= 300mA 250 mV
V
IN
= 1.5V, I
SW
= 800mA 450 mV
V
IN
= 3.0V, I
SW
= 800mA 450 mV
Switch Leakage Current Output switch off, V
SW
= 36V 1 µA
Oscillator Frequency MIC2570-1, -2; I
SW
= 100mA 20 kHz
Maximum Output Voltage 36 V
Sync Threshold Voltage 0.7 V
Switch On-Time 35 µs
Currrent Limit 1.1 A
Duty Cycle V
FB
< V
REF
, I
SW
= 100mA
67 %
General Note: Devices are ESD protected; however, handling precautions are recommended.
Note 1: Measured using comparator trip point.
Absolute Maximum Ratings
Supply Voltage (V
IN
) ...................................................... 18V
Switch Voltage (V
SW
) .................................................... 36V
Switch Current (I
SW
) ........................................................ 1A
Sync Voltage (V
SYNC
) ......................................–0.3V to 15V
Storage Temperature (T
A
) ......................... –65°C to +150°C
SOIC Power Dissipation (P
D
) .................................. 400mW
Operating Ratings
Supply Voltage (V
IN
) ..................................... +1.3V to +15V
Ambient Operating Temperature (T
A
) ......... –40°C to +85°C
Junction Temperature (T
J
) ........................ –40°C to +125°C
SOIC Thermal Resistance (θ
JA
) ............................ 140°C/W
P1-P3P4-P6P7-P9P10-P12P13-P15

MIC2570-2YM

Mfr. #:
Buy MIC2570-2YM
Manufacturer:
Microchip Technology / Micrel
Description:
Switching Voltage Regulators Two Cell Boost Regulator
Lifecycle:
New from this manufacturer.
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