MAX2251 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – +2.8V, Single-Supply, Cellular-Band Linear Power Amplifier

19-1773; Rev 2; 2/03
EVAALVUAAILTAIOBNLEKIT
+2.8V, Single-Supply,
Cellular-Band Linear Power Amplifier
General Description
The MAX2251 low-voltage linear power amplifier (PA) is
designed for TDMA/AMPS dual-mode phone applica-
tions. The device is packaged in an ultra-compact
(2.06mm ✕ 2.06mm) chip-scale package (CSP), and
delivers over +30dBm of linear power in TDMA opera-
tion. An on-chip shutdown feature reduces operating
current to 1µA (typ), eliminating the need for an external
supply switch.
The MAX2251 does not need an external reference volt-
age, and requires only a few external matching compo-
nents and no bias circuitry. Another feature of this
device is the use of external bias resistors, eliminating
wasted “safety-margin” current. This feature also allows
current throttleback at lower output power levels, there-
by maintaining the highest possible efficiency at all
power levels.
________________________Applications
Cellular-Band TDMA/AMPS Dual-Mode Phones
PA Modules
2-Way Pagers
Cordless Phones
TOP VIEW
PIN A1
INDICATOR
Features
o Ultra-Compact 4 ✕ 4 (2.06mm ✕ 2.06mm) CSP
o High Efficiency—41% at +30dBm P_OUT (TDMA)
(typ)
o On-Chip Power Detector
o I_CC < 1µA in Shutdown Mode
o +2.8V to +4.5V True Single-Supply Operation
o ±0.9dB Gain Variation from T_A = -40°C to +85°C
o Current Adjustable with PDM or DAC Signal
o No External Logic Interface Circuitry Required
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
TOP MARK
2251
MAX2251EBE
-40°C to +85°C
4 × 4 UCSP
EBE
_ _ _ (LOT #)
_ _ _ (DATE CODE)
Typical Operating Circuit appears at end of data sheet.
Pin Configuration
BIAS2
GND
GND
GND
MAX2251
A1
A2
A3
A4
POWER
DETECTOR
B1
B2
PD_OUT
GND
BIAS1
GND
C1
C2
B3
B4
OUT
OUT
V_CC
GND
C3
C4
LOGIC AND
BIAS
D1
D2
V_CC
IN
D3
SHDN
D4
MODE
________________________________________________________________ Maxim Integrated Products 1
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