Datasheet

TPS62420, TPS62421
www.ti.com SLVS676C –JUNE 2006–REVISED JUNE 2010
ELECTRICAL CHARACTERISTICS
V
IN
= 3.6V, V
OUT
= 1.8V, EN = V
IN
, MODE = GND, L = 2.2mH, C
OUT
= 20mF, T
A
= –40°C to 85°C typical values are at T
A
=
25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V
IN
Input voltage range 2.5 6.0 V
One converter, I
OUT
= 0mA. PFM mode enabled 19 29 mA
(Mode = 0) device not switching,
EN1 = 1 OR EN2 = 1
Two converter, I
OUT
= 0mA. PFM mode enabled 32 48 mA
(Mode = 0) device not switching,
I
Q
Operating quiescent current
EN1 = 1 AND EN2 = 1
I
OUT
= 0mA, MODE/DATA = GND, for one 23 mA
converter, V
OUT
1.575V
(1)
I
OUT
= 0mA, MODE/DATA = V
IN
, for one 3.6 mA
converter, V
OUT
1.575V
(1)
EN1, EN2 = GND, V
IN
= 3.6V
(2)
1.2 3
I
SD
Shutdown current mA
EN1, EN2 = GND, V
IN
ramped from 0V to 3.6V
(3)
0.1 1
Falling 1.5 2.35
V
UVLO
Undervoltage lockout threshold V
Rising 2.4
ENABLE EN1, EN2
V
IH
High-level input voltage, EN1, EN2 1.2 V
IN
V
V
IL
Low-level input voltage, EN1, EN2 0 0.4 V
I
IN
Input bias current, EN1, EN2 EN1, EN2 = GND or VIN 0.05 1.0 mA
DEF_1 INPUT
V
DEF_1H
DEF_1 high level input voltage DEF_1 pin is a digital input at fixed output voltage 09 V
IN
V
options (TPS62421)
V
DEF_1L
DEF_1 low level input voltage 0 0.4
I
IN
Input biasd current DEF_1 DEF_1 = GND or VIN 0.01 1.0 mA
MODE/DATA
V
IH
High-level input voltage, 1.2 V
IN
V
MODE/DATA
V
IL
Low-level input voltage, 0 0.4 V
MODE/DATA
I
IN
Input bias current, MODE/DATA MODE/DATA = GND or VIN 0.01 1.0 mA
V
OH
Acknowledge output voltage high Open drain, via external pullup resistor V
IN
V
V
OL
Acknowledge output voltage low Open drain, sink current 500mA 0 0.4 V
INTERFACE TIMING
t
Start
Start time 2 ms
t
H_LB
High time low bit, logic 0 detection Signal level on MODE/DATA pin is > 1.2V 2 200 ms
t
L_LB
Low time low bit, logic 0 detection Signal level on MODE/DATA pin < 0.4V 2x 400 ms
t
H_LB
t
L_HB
Low time high bit, logic 1 detection Signal level on MODE/DATA pin < 0.4V 2 200 ms
t
H_LB
High time high bit, logic 1 detection Signal level on MODE/DATA pin is > 1.2V 2x 400 ms
t
L_HS
T
EOS
End of Stream T
EOS
2 ms
t
ACKN
Duration of acknowledge condition V
IN
2.5V to 6V 400 520 ms
(MODE/DATE line pulled low by the
device)
t
valACK
Acknowledge valid time 2 ms
(1) Device is switching with no load on the output, L = 3.3mH, value includes losses of the coil
(2) These values are valid after the device has been already enabled one time (EN1 or EN2 = high) and supply voltage V
IN
has not
powered down.
(3) These values are valid when the device is disabled (EN1 and EN2 low) and supply voltage V
IN
is powered up. The values remain valid
until the device has been enabled first time (EN1 or EN2 = high). After first enable, Note 3 becomes valid.
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Product Folder Link(s): TPS62420 TPS62421