Datasheet

TPS62420-Q1
SLVSA56 –DECEMBER 2009 www.ti.com
TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
FIGURE NO.
Efficiency V
OUT1
= 1.1V 1
Efficiency V
OUT1
= 1.575V 2
Efficiency V
OUT2
= 1.8V 3
Efficiency V
OUT2
= 3.3V 4
Efficiency vs V
IN
5, 6
DC Output Accuracy V
OUT1
= 1.1V 7
DC Output Accuracy V
OUT2
= 3.3V 8
F
OSC
vs V
IN
9
I
q
for one converter 10
I
q
for both converters, not switching 11
R
DSON
PMOS vs V
IN
12
R
DSON
NMOS vs V
IN
13
Light Load Output Voltage Ripple in Power Save Mode 14
Output Voltage Ripple in Forced PWM Mode 15
Output Voltage Ripple in PWM Mode 16
Forced PWM/ PFM ModeTransition 17
Load Transient Response PFM/PWM 18
Load Transient Response PWM Operation 19
Line Rransient Response 20
Startup Timing One Converter 21
Typical Operation V
IN
= 3.6V, V
OUT1
= 1.575V, VOUT2 = 1.8V 22
Typical Operation V
IN
= 3.6V, V
OUT1
= 1.8V, V
OUT2
= 3.0V 23
Typical Operation V
IN
= 3.6V, V
OUT1
= 1.2V, V
OUT2
= 1.2V 24
V
OUT1
Change With Easy Scale 25
Dynamic Voltage Positioning 26
Soft Start 27
EasyScale Protocol Overview 28
EasyScale Protocol Without Acknowledge 29
EasyScale Protocol Including Acknowledge 30
EasyScale – Bit Coding 31
MODE/DATA PIN: Mode Selection 32
MODE/DATA Pin: Power Save Mode / Interface Communication 33
Typical Application Circuit 1.5V / 2.85V Adjustable Outputs 34, 35
Layout Diagram 36
PCB Layout 37
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