MAX848ESE+ Maxim Integrated Products, MAX848ESE+ Datasheet

IC DC-DC CONV LN HP 16-SOIC

MAX848ESE+

Manufacturer Part Number
MAX848ESE+
Description
IC DC-DC CONV LN HP 16-SOIC
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX848ESE+

Applications
Converter, RF Data Links
Voltage - Input
0.7 ~ 5.5 V
Number Of Outputs
1
Voltage - Output
3.3V, 2.7 ~ 5.5 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX848/MAX849 boost converters set a new stan-
dard of high efficiency and high integration for noise-
sensitive power-supply applications, such as portable
phones and small systems with RF data links. The heart
of the these devices is a synchronous boost-topology
regulator that generates a fixed 3.3V output (or 2.7V to
5.5V adjustable output) from one to three NiCd/NiMH
cells or one Li-Ion cell.
Synchronous rectification provides a 5% efficiency
improvement over similar nonsynchronous boost regu-
lators. In standby mode, pulse-skipping PFM operation
keeps the output voltage alive with only 150µW quies-
cent power consumption. Fixed-frequency PWM opera-
tion ensures that the switching noise spectrum is limited
to the 300kHz fundamental and its harmonics, allowing
easy post-filtering noise reduction. For even tighter
noise spectrum control, synchronize to a 200kHz to
400kHz external clock.
Battery monitoring is provided by a two-channel, volt-
age-to-frequency analog-to-digital converter (ADC).
One channel is intended for a single-cell battery input
(0.625V to 1.875V range), while the other channel is for
monitoring higher voltages (0V to 2.5V range).
Two control inputs are provided for push-on, push-off
control via a momentary pushbutton switch. Upon
power-up, an internal comparator monitors the output
voltage to generate a power-good output (POK).
The devices differ only in the current limit of the
N-channel MOSFET power switch: 0.8A for the
MAX848, and 1.4A for the MAX849.
Pin Configuration appears at end of data sheet.
Dual Mode is a trademark of Maxim Integrated Products.
19-1095; Rev 2; 12/97
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
V
(V)
0.9
1.2
2.4
2.7
3.6
IN
Typical Output Selector Guide
V
(V)
3.3
3.3
3.3
3.3
OUT
5
5
5
5
5
________________________________________________________________ Maxim Integrated Products
MAX849 I
Low-Noise, Step-Up DC-DC Converters
General Description
(mA)
1000
100
300
200
750
500
800
600
70
OUT
MAX848 I
(mA)
110
200
130
250
150
300
70
40
70
1-Cell to 3-Cell, High-Power,
OUT
A/D CHANNEL SELECT
Digital Cordless Phones
Cellular Phones
Palmtop Computers
Local 3.3V to 5V Supplies
Up to 95% Efficiency
(see Typical Output Selector Guide below)
3.3V Dual Mode™ or 2.7V to 5.5V Adj. Output
0.7V to 5.5V Input Range
0.15mW Standby Mode
300kHz PWM Mode or Synchronizable
Two-Channel ADC with Serial Output
Power-Good Function
A/D CHANNEL 1 IN
A/D CHANNEL 2 IN
ON/OFF CONTROL
INPUT
0.8V TO 5.5V
MAX848ESE
MAX849ESE
SYNC INPUT
PART
A/D OUTPUT
Typical Operating Circuit
AIN1
AIN2
AINSEL
DATA
ON1
ON2
CLK/SEL
POKIN
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
REF
Ordering Information
MAX848
MAX849
GND
PCS Phones
Hand-Held Instruments
Personal Communicators
PGND
POUT
OUT
POK
LX
FB
Applications
PIN-PACKAGE
16 Narrow SO
16 Narrow SO
Features
VOLTAGE MONITOR
OUTPUT
OUTPUT
1

Related parts for MAX848ESE+

MAX848ESE+ Summary of contents

Page 1

... Pin Configuration appears at end of data sheet. Dual 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 408-737-7600 ext. 3468. 1-Cell to 3-Cell, High-Power, ...

Page 2

High-Power, Low-Noise, Step-Up DC-DC Converters ABSOLUTE MAXIMUM RATINGS ON1, ON2, OUT, POUT to GND..................................-0.3V, +6V PGND to GND ..........................................................-0.3V, +0. PGND ...............................................-0.3V, (V CLK/SEL, DATA, POKIN, REF, AINSEL, AIN1, AIN2, FB, POK to GND .....-0.3V, ...

Page 3

Low-Noise, Step-Up DC-DC Converters ELECTRICAL CHARACTERISTICS (continued) = 3.6V, GND = PGND = CLK/SEL = ON1 = ON2 = AINSEL = AIN1 = AIN2 = FB = POKIN, POUT = OUT OUT unless otherwise noted.) PARAMETER Operating Current ...

Page 4

High-Power, Low-Noise, Step-Up DC-DC Converters ELECTRICAL CHARACTERISTICS = 3.6V, GND = PGND = CLK/SEL = ON1 = ON2 = AINSEL = AIN1 = AIN2 = FB = POKIN, POUT = OUT OUT unless otherwise noted.) ...

Page 5

Low-Noise, Step-Up DC-DC Converters (T = +25°C, unless otherwise noted.) A MAX849 EFFICIENCY vs. LOAD CURRENT (V = 3.3V) OUT 100 PFM PWM ...

Page 6

High-Power, Low-Noise, Step-Up DC-DC Converters (T = +25°C, unless otherwise noted.) A HEAVY-LOAD SWITCHING WAVEFORMS (V = 3.3V) OUT MAX848/9 TOC- s/div V = 1.1V 200mA 3.3V IN OUT ...

Page 7

Low-Noise, Step-Up DC-DC Converters (T = +25°C, unless otherwise noted.) A MAX849 GSM LOAD-TRANSIENT RESPONSE A B 1ms/div V = 3.6V 5V 440 F IN OUT OUT RIPPLE, 200mV/div, AC COUPLED OUT B ...

Page 8

High-Power, Low-Noise, Step-Up DC-DC Converters PIN NAME 1 AIN1 ADC’s Channel 1 Input. Analog input voltage range is 0.625V to 1.875V. 2 AIN2 ADC’s Channel 2 Input. Analog input voltage range 2.5V. 3 REF ...

Page 9

Low-Noise, Step-Up DC-DC Converters OUT 2.25V ON1 ON ON2 REF 1.25V GND CLK/SEL FB FEEDBACK AND POWER-GOOD SELECT POKIN AINSEL AIN1 AIN2 Figure 1. Functional Diagram _______________Detailed Description The MAX848/MAX849 combine a switching regulator, N-channel power MOSFET, P-channel synchronous rectifier, ...

Page 10

High-Power, Low-Noise, Step-Up DC-DC Converters 10 * OUT POUT C2 MBR0520L MAX849 0 GND 100k L1 POK 0.1 F ON1 LX ON2 PGND CLK/SEL C3 FB 0.22 F POKIN REF * Figure ...

Page 11

Low-Noise, Step-Up DC-DC Converters FEEDBACK REF PWM-MODE CURRENT- LIMIT LEVEL OSC Figure 4. Controller Block Diagram in PWM Mode where V = 1.25V the desired output volt- REF OUT age, and V is the desired ...

Page 12

High-Power, Low-Noise, Step-Up DC-DC Converters f /2 OSC DATA Figure 7. Bit Stream at 1/2 Full Scale When using two counters of the same length, as shown in Figure 8, one counter (A) just counts the A/D ...

Page 13

Low-Noise, Step-Up DC-DC Converters 1M MAX848 MAX849 ON2 OUT ON1 1M Figure 9. Momentary Pushbutton On/Off Switch Capacitor Selection Input Bypass Capacitors A 22µF, low-ESR input capacitor will reduce peak cur- rents and reflected noise due to inductor current ripple. ...

Page 14

High-Power, Low-Noise, Step-Up DC-DC Converters MAX848 MAX849 OUT R POK C Figure 11. Power-On Reset Delay Power-On Reset Delay Adding a timing capacitor from POK to GND generates a power-on reset delay. The reset time constant is ...

Page 15

Low-Noise, Step-Up DC-DC Converters Pin Configuration TOP VIEW 1 16 AIN1 2 15 AIN2 3 14 REF MAX848 4 13 GND MAX849 5 OUT 12 11 POKIN POK 8 Narrow SO ______________________________________________________________________________________ 1-Cell to 3-Cell, ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products NOTES Printed USA is a registered trademark of Maxim Integrated Products ...

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