MAX1692EUB+ Maxim Integrated Products, MAX1692EUB+ Datasheet

IC REG PWM STEP-DN 5.5VIN 10UMAX

MAX1692EUB+

Manufacturer Part Number
MAX1692EUB+
Description
IC REG PWM STEP-DN 5.5VIN 10UMAX
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet

Specifications of MAX1692EUB+

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
1.25 ~ 5.5 V
Current - Output
600mA
Frequency - Switching
750kHz
Voltage - Input
2.7 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Power - Output
444mW
Output Voltage
1.25 V to 5.5 V
Input Voltage
2.7 V to 5.5 V
Supply Current
85 uA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1692 is a low-noise, pulse-width-modulated
(PWM), DC-DC step-down converter. It powers logic
and transmitters in small wireless systems such as cellu-
lar phones, communicating PDAs, and handy-terminals.
The device features an internal synchronous rectifier for
high efficiency; it requires no external Schottky diode.
Excellent noise characteristics and fixed-frequency
operation provide easy post-filtering. The MAX1692 is
ideally suited for Li-Ion battery applications. It is also
useful for +3V or +5V fixed input applications.
The device operates in one of four modes. Forced PWM
mode operates at a fixed frequency regardless of the
load. Synchronizable PWM mode allows an external
switching frequency to control and minimize harmonics.
Idle Mode™ (PWM/PFM) extends battery life by switch-
ing to a PFM pulse-skipping mode during light loads.
Shutdown mode places the device in standby, reduc-
ing quiescent supply current to under 0.1µA.
The MAX1692 can deliver over 600mA. The output volt-
age can be adjusted from 1.25V to V
range of +2.7V to +5.5V. Other features of the
MAX1692 include high efficiency, low dropout voltage,
and a 1.2%-accurate 1.25V reference. It is available in
a space-saving 10-pin µMAX package with a height of
only 1.11mm.
Cellular Phones
Cordless Phones
PDAs and Handy-Terminals Battery-Operated Devices
Idle Mode is a trademark of Maxim Integrated Products.
19-1400; Rev 0; 11/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
V
IN
= 2.7V TO 5.5V
________________________________________________________________ Maxim Integrated Products
General Description
C1
CPU I/O Supplies
Notebook Chipset Supplies
(1 Li-Ion or 3 NiMH/NiCd)
C3
Applications
IN
with the input
IN
SHDN
LIM
BP
AGND
MAX1692
PWM Step-Down Regulator
SYNC/PWM
REF
PGND
C4
LX
FB
Low-Noise, 5.5V-Input,
MAX1692EUB
+2.7V to +5.5V Input Range
Adjustable Output from 1.25V to V
600mA Guaranteed Output Current
95% Efficiency
No Schottky Diode Required
85µA Quiescent Current
100% Duty Cycle in Dropout
750kHz Fixed-Frequency PWM Operation
Synchronizable Switching Frequency
Accurate Reference: 1.25V (±1.2%)
Small 10-Pin µMAX Package
TOP VIEW
PART
L
GND
REF
Typical Operating Circuit
BP
FB
IN
R1
R2
1
2
3
4
5
TEMP. RANGE
-40°C to +85°C
Ordering Information
MAX1692
MAX
Pin Configuration
C2
V
OUT
10
9
8
7
6
= 1.25V TO V
10 µMAX
PIN-PACKAGE
PGND
LX
SHDN
SYNC/PWM
LIM
IN
Features
IN
1

Related parts for MAX1692EUB+

MAX1692EUB+ Summary of contents

Page 1

... Li-Ion or 3 NiMH/NiCd 2. Idle Mode is a trademark of Maxim Integrated Products. ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Low-Noise, 5.5V-Input, PWM Step-Down Regulator +2.7V to +5.5V Input Range Adjustable Output from 1 ...

Page 2

Low-Noise, 5.5V-Input, PWM Step-Down Regulator ABSOLUTE MAXIMUM RATINGS IN, BP, SHDN, SYNC/PWM, LIM to GND ................ -0. .................................................................-0.3V to +0.3V PGND to GND ...................................................... -0.3V to +0. PGND................................................. -0. FB, REF ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +3.6V, SYNC/PWM = GND LIM values are +25°C.) A PARAMETER SYMBOL Reference Load Regulation Undervoltage Lockout Threshold UVLO Logic Input High V Logic Input Low Logic Input Current SYNC/PWM Minimum ...

Page 4

Low-Noise, 5.5V-Input, PWM Step-Down Regulator (SYNC/PWM = GND, circuit of Figure Sumida CD43-100, T DROPOUT VOLTAGE vs. LOAD CURRENT 600 500 V = 2.5V OUT 400 300 V = 3.3V OUT 200 100 0 0 150 300 ...

Page 5

GND +25°C, unless otherwise noted.) A OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE 800 T = +85°C A 750 T = +25°C A 700 T = -40°C A 650 I = 200mA OUT 600 2.7 3.1 3.5 3.9 ...

Page 6

Low-Noise, 5.5V-Input, PWM Step-Down Regulator PIN NAME 1 IN Supply Voltage Input. Input range from +2.7V to +5.5V. Bypass with a 10µF capacitor. Supply Bypass Pin. Internally connected to IN. Bypass with a 0.1µF capacitor. Do not connect to an ...

Page 7

Detailed Description The MAX1692 step-down, pulse-width-modulated (PWM), DC-DC converter has an adjustable output range from 1.25V to the input voltage. An internal syn- chronous rectifier improves efficiency and eliminates an external Schottky diode. Fixed-frequency operation enables easy post-filtering, thereby providing ...

Page 8

Low-Noise, 5.5V-Input, PWM Step-Down Regulator amounts of reverse current to flow from the output dur- ing light loads. This allows regulation with a constant- switching frequency and eliminates minimum load requirements. The NEGLIM comparator threshold is 50mA if V < ...

Page 9

Capacitor Selection Choose input- and output-filter capacitors to service inductor currents with acceptable voltage ripple. The input-filter capacitor also reduces peak currents and noise at the voltage source. In addition, connect a low- ESR bulk capacitor (>10µF suggested) to the ...

Page 10

Low-Noise, 5.5V-Input, PWM Step-Down Regulator Bypass Considerations Bypass IN and OUT to PGND with 10µF and 47µF, respectively. Bypass BP and REF to GND with 0.1µF and 0.22µF, respectively. Locate the bypass capacitors as close as possible to their respective ...

Page 11

Chip Information TRANSISTOR COUNT: 1462 ______________________________________________________________________________________ Low-Noise, 5.5V-Input, PWM Step-Down Regulator Package Information 11 ...

Page 12

... Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 12 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products © ...

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