MAX1687EUE Maxim Integrated Products, MAX1687EUE Datasheet

IC CONV DCDC GSM LIMIT 16-TSSOP

MAX1687EUE

Manufacturer Part Number
MAX1687EUE
Description
IC CONV DCDC GSM LIMIT 16-TSSOP
Manufacturer
Maxim Integrated Products
Type
Step-Up (Boost)r
Datasheet

Specifications of MAX1687EUE

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
1.25 ~ 6 V
Current - Output
2.5A
Frequency - Switching
1MHz
Voltage - Input
2.7 ~ 6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP
Power - Output
457mW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX1687EUE
Manufacturer:
MAX
Quantity:
18 018
Part Number:
MAX1687EUE+T
Manufacturer:
MAXIX
Quantity:
20 000
The MAX1687/MAX1688 step-up DC-DC converters deliv-
er up to 2W from a single Li-Ion or three NiMH cells. The
devices are ideal for burst-load applications such as GSM
cell phones and wireless LANs, where the RF power
amplifiers require short, high current bursts. The
MAX1687/MAX1688 reduce battery surge current by slow-
ly charging a reservoir capacitor, which supplies the nec-
essary peak energy for the load current burst. As a result,
the peak battery current is limited, thus maximizing battery
life and minimizing battery voltage sag and transient dips.
An internal synchronous rectifier provides over 90% con-
version efficiency and eliminates the need for an external
Schottky diode. A logic shutdown mode reduces the shut-
down current to only 3µA. The devices can be disabled
during current bursts (RF transmit mode) to eliminate
switching noise.
The switching frequency of the MAX1687/MAX1688, con-
trolled by the selected inductor, can exceed 1MHz. Two
external resistors set the output voltage from 1.25V to 6V.
The MAX1687 controls peak battery current, while the
MAX1688 features a more advanced, adaptive constant-
recharge-time algorithm that maximizes battery life. The
MAX1687/MAX1688 are available in thin 16-pin TSSOP
(1.1mm max height) or standard 8-pin SO packages.
For small orders, phone 1-800-835-8769.
19-1426; Rev 0; 2/99
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
Pg
Pin Configurations continued at end of data sheet.
[ ] ARE FOR MAX1688
TOP VIEW
GSM Phones
Wireless Handsets
PC Cards (PCMCIA)
LIM [CHG]
N.C.
LX1
LX1
REF
FB
IN
IN
________________________________________________________________ Maxim Integrated Products
Precise, Adaptive Current Limit for GSM
1
2
3
4
5
6
8
7
General Description
MAX1687
MAX1688
TSSOP
Pin Configurations
Applications
16
15
14
13
12
11
10
9
OUT
OUT
LX2
LX2
PGND
PGND
AGND
ON
Step-Up DC-DC Converters with
* Ug.
MAX1687EUE
MAX1687ESA
MAX1688EUE
MAX1688ESA
3 ALKALINE
Low 450mA Peak Battery Current
Provides 2A, 5V GSM Burst
90% Efficiency
Internal Power MOSFETs and Current-Sense
Resistor
Output Disconnects from Input During Shutdown
3µA Shutdown Current
Precise Voltage-Controlled Current Limit
(MAX1687)
Adaptive Constant-Recharge-Time Capability
(MAX1688)
1.25V to 6V Adjustable Output
2.7V to 6V Input Range
(1 Li-Ion cell or 3 NiMH cells)
Switching Frequency Can Exceed 1MHz
Standby Mode Disables DC-DC During
Transmission Burst
Low Inrush Current at Start-Up
( ) ARE FOR MAX1687
[ ] ARE FOR MAX1688
1 Li-lon
3 NiMH
OFF
PART*
CONTROL INPUT
OR
OR
2.7V TO 6V
0 TO 1V
ON
Typical Operating Circuit
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
(LIM)
ON
REF
IN
Ordering Information
LX1
MAX1687
MAX1688
GND
LX2
[CHG]
OUT
FB
16 TSSOP
16 TSSOP
8 SO
8 SO
PIN-PACKAGE
Features
UP TO 6V
V
OUT
1

Related parts for MAX1687EUE

MAX1687EUE Summary of contents

Page 1

... Adaptive Constant-Recharge-Time Capability (MAX1688) 1.25V to 6V Adjustable Output 2. Input Range (1 Li-Ion cell or 3 NiMH cells) Switching Frequency Can Exceed 1MHz Standby Mode Disables DC-DC During Transmission Burst Low Inrush Current at Start-Up PART* MAX1687EUE MAX1687ESA Applications MAX1688EUE MAX1688ESA * Ug. 2. Li-lon 16 OUT OR ...

Page 2

Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM ABSOLUTE MAXIMUM RATINGS IN, ON, LX1, CHG, LIM, FB, OUT, REF to GND .......-0.3V to +7V LX2 to GND ..............................................................-0.3V to +8V IN, LX1 Average Current..........................................................1A Continuous Power Dissipation (T ...

Page 3

Precise, Adaptive Current Limit for GSM ELECTRICAL CHARACTERISTICS ( +3V (MAX1687 LIM (Note 1) PARAMETER SYMBOL Input Voltage Range Input Undervoltage Lockout Output Voltage Range Input Supply Current I SHDN Shutdown ...

Page 4

Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM _____________________________ Typical Operating Characteristics (continued +3.3V 5V 1V, Figures 6b and OUT LIM MAX1688 PEAK BATTERY CURRENT vs. R (1A ...

Page 5

Precise, Adaptive Current Limit for GSM ( V = +3.3V 5V 1V, Figures 6b and OUT LIM SWITCHING WAVEFORMS (FIXED I = 300mA) LOAD 500mA/div 100mV/div 500 s/div MAX1688 SWITCHING WAVEFORMS (GSM PULSED ...

Page 6

Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM PIN MAX1687 MAX1688 SO TSSOP SO TSSOP — — — — 7 — — 8 — ...

Page 7

Precise, Adaptive Current Limit for GSM (LIM) [CHG ARE FOR MAX1687 [ ] ARE FOR MAX1688 (ALSO DASHED LINES) Figure 1. Functional Diagram When starting up, the MAX1687/MAX1688 employ four successive ...

Page 8

Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM I PEAK SET LIM CHG I - 200mA PEAK TIME ( ) ARE FOR MAX1688 Figure 2. Hysteretic Inductor Current OUT MAX1687 MAX1688 ...

Page 9

Precise, Adaptive Current Limit for GSM a) MAX1687 LIM REF DAC c) REF R3 MAX1687 LIM R4 Figure 5. Current-Limit Adjust To set the current limit, apply a voltage LIM. The current limit is 200mA ...

Page 10

Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM Output (Reservoir) Capacitor The value of the output capacitor determines the amount of power available to deliver to the power amplifier during the RF burst. A larger output capacitor with ...

Page 11

Precise, Adaptive Current Limit for GSM 0.1 F OFF *TSSOP PACKAGE ONLY Figure 6b. MAX1687 Typical Application Circuit (Fixed Non-Pulsed Load 2. 0 CHG OFF 40.2k Figure 7. MAX1688 ...

Page 12

Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM Pin Configurations (continued) TOP VIEW IN 1 LX1 2 MAX1687 MAX1688 LIM [CHG ARE FOR MAX1688 12 ______________________________________________________________________________________ Table 1. Component Suppliers COMPANY AVX ...

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