MAX1798, MAX1799 CDMA Cellular/PCS System Power Supplies

Description

The MAX1798/MAX1798A/MAX1799/MAX1799A system power supplies are designed specifically for CDMA cellular/PCS handsets. Each device contains five low-dropout linear regulators (LDOs), a 140ms (min) reset timer, a serial interface, push-on/push-off control logic, and two general-purpose open-drain outputs. Only the serial interface is different between the MAX1798/MAX1798A/MAX1799/MAX1799A: the MAX1798/MAX1798A feature an SPI™-compatible serial interface, and the MAX1799/MAX1799A feature an I²C*-compatible interface.

Each linear regulator features extremely low dropout voltage, specified at two-thirds of the maximum output current. LDO1 is rated for 300mA, while LDOs 2–5 are each rated for 150mA. All LDOs are optimized for low noise and isolation. Each LDO can be individually enabled and disabled through the serial port, as well as individually programmed to any of 32 voltages from 1.8V to 3.3V.

The MAX1798/MAX1798A/MAX1799/MAX1799As' wide 2.5V to 5.5V input voltage range makes them compatible with a wide range of input supplies, including a single Li+ cell battery. Both devices are available in thermally enhanced 20-pin TSSOP exposed pad (EP) packages. Evaluation kits (MAX1798EVKIT and MAX1799EVKIT) are available to facilitate designs.

An evaluation kit is available: MAX1799EVCMAXQU, MAX1799EVKIT

Key Features

Applications/Uses

One 300mA Low-Noise LDO
Four 150mA Low-Noise LDOs
45µVRMS Noise from 10Hz to 100kHz
>60dB Crosstalk Isolation Below 10kHz
>60dB PSRR Below 10kHz
125mV (max) Dropout (OUT1 at 200mA)
100mV (max) Dropout (OUT2–5 at 100mA)
Programmable Output Voltages
1.8V to 3.3V in 32 Steps
140ms (min) Reset Timer
SPI- or I²C-Compatible Serial Interface
Push-On/Push-Off Control Logic
Two 150mA General-Purpose Open-Drain Outputs
Overcurrent and Thermal Protection (all LDOs)
1µA Shutdown Current
20-Pin Thermally Enhanced TSSOP Package

	2- or 3-Cell NiMH, NiCd, or Alkaline Systems
	CDMA Cellular/PCS Handsets
	Handy Terminals
	Palmtop Computers
	PDAs
	Single-Cell Li+ Systems

Key Specifications: Linear Regulators

Part Number

Regulators

V_IN
(V)

Adj. V_OUT
(V)

V_DROPOUT @Rated I_LOAD
(V)

Rated I_LOAD
(mA)

I_CC
(µA)

Low Batt./ Pwr. Fail Out

POK/Reset Thresh.
(V)

Watchdog

Reverse Batt. Protect.

Oper. Temp.
(°C)

Package/Pins

Smallest Available Pckg.
(mm²)

Price

min

max

min

max

typ

max

nom

max w/pins

See Notes

MAX1798

2.5

5.5

1.8

3.3

0.12

300

680

Vout-13%

Vout-7.5%

-40 to +85

MAX1799

See All Linear Regulators (152)

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-17 of 17

MAX1798

Free
Sample

Buy

Status

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1798EGP+T

Active

Land Pattern: Not Available

-40°C to +85°C

See data sheet

MAX1798EGP+

Active

QFN;20 pin;26 mm²
Outline Drawing: 21-0091 (PDF)
Land Pattern: 90-0276 (PDF)
Use pkgcode/variation: G2055+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1798EGP

Active

QFN;20 pin;26 mm²
Outline Drawing: 21-0091 (PDF)
Land Pattern: 90-0276 (PDF)
Use pkgcode/variation: G2055-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1798EGP-T

Active

Land Pattern: Not Available

-40°C to +85°C

See data sheet

MAX1798AEUP-T

Active

TSSOP-EP;20 pin;42.9 mm²
Outline Drawing: 21-0108 (PDF)
Land Pattern: 90-0114 (PDF)
Use pkgcode/variation: U20E-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1798AEUP

Active

TSSOP-EP;20 pin;42.9 mm²
Outline Drawing: 21-0108 (PDF)
Land Pattern: 90-0114 (PDF)
Use pkgcode/variation: U20E-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1798EUP

Active

TSSOP-EP;20 pin;42.9 mm²
Outline Drawing: 21-0108 (PDF)
Land Pattern: 90-0114 (PDF)
Use pkgcode/variation: U20E-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1798EUP-T

Active

TSSOP-EP;20 pin;42.9 mm²
Outline Drawing: 21-0108 (PDF)
Land Pattern: 90-0114 (PDF)
Use pkgcode/variation: U20E-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1799

Free
Sample

Buy

Status

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1799EVSYS

Active

Land Pattern: Not Available

-40°C to +85°C

See data sheet

MAX1799EGP+T

Active

QFN;20 pin;26 mm²
Outline Drawing: 21-0091 (PDF)
Land Pattern: 90-0276 (PDF)
Use pkgcode/variation: G2055+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1799EGP+

Active

QFN;20 pin;26 mm²
Outline Drawing: 21-0091 (PDF)
Land Pattern: 90-0276 (PDF)
Use pkgcode/variation: G2055+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1799EGP

Active

QFN;20 pin;26 mm²
Outline Drawing: 21-0091 (PDF)
Land Pattern: 90-0276 (PDF)
Use pkgcode/variation: G2055-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1799EGP-T

Active

QFN;20 pin;26 mm²
Outline Drawing: 21-0091 (PDF)
Land Pattern: 90-0276 (PDF)
Use pkgcode/variation: G2055-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1799EUP+

Active

TSSOP-EP;20 pin;42.9 mm²
Outline Drawing: 21-0108 (PDF)
Land Pattern: 90-0114 (PDF)
Use pkgcode/variation: U20E+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1799EUP+T

Active

Land Pattern: Not Available

-40°C to +85°C

See data sheet

MAX1799EUP

Active

TSSOP-EP;20 pin;42.9 mm²
Outline Drawing: 21-0108 (PDF)
Land Pattern: 90-0114 (PDF)
Use pkgcode/variation: U20E-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1799EUP-T

Active

TSSOP-EP;20 pin;42.9 mm²
Outline Drawing: 21-0108 (PDF)
Land Pattern: 90-0114 (PDF)
Use pkgcode/variation: U20E-1*