MAX8896 Datasheet, PDF (6/17 Pages) Maxim Integrated Products – Dual PWM Step-Down Converter in a 2mm x 2mm Package for WCDMA PA and RF Power

Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
Typical Operating Characteristics (continued)
(V_CC = V_IN1 = V_IN2 = 3.6V, V_REFIN = 0.72V, circuit of Figure 3, T_A = +25°C, unless otherwise noted.)
OUT1 PA STEP-DOWN CONVERTER OUTPUT
VOLTAGE vs. REFIN VOLTAGE
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
REFIN VOLTAGE (V)
OUT1 LIGHT-LOAD SWITCHING
WAVEFORMS
MAX8896 toc12
5mA LOAD
200mA/div
I_L1
V_PA
20mV/div
(AC-COUPLED)
V_LX1
2V/div
OUTPUT VOLTAGE ERROR
vs. LOAD CURRENT
4
V_OUT = 0.56V
3
2
1
0
-1
-2
V_OUT = 3.18V
-3
-4
0 100 200 300 400 500 600 700 800
LOAD CURRENT (mA)
OUT1 HEAVY-LOAD SWITCHING
WAVEFORMS
MAX8896 toc13
500mA LOAD
I_LX1
200mA/div
V_PA
20mV/div
(AC-COUPLED)
V_LX1
2V/div
200ns/div
200ns/div
V_PAEN
OUT1 STARTUP AND SHUTDOWN
MAX8896 toc14
5V/div
1V/div
V_PA
I_L1
500mA/div
20µs/div
6 _______________________________________________________________________________________